Patent Publication Number: US-2023146991-A1

Title: Techniques for deadline-aware scheduling

Description:
FIELD OF TECHNOLOGY 
     The following relates to wireless communications, including techniques for deadline-aware scheduling (DAS). 
     BACKGROUND 
     Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power). Examples of such multiple-access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems. These systems may employ technologies such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple-access communications system may include one or more base stations or one or more network access nodes, each simultaneously supporting communication for multiple communication devices, which may be otherwise known as user equipment (UE). 
     Wireless communications systems may utilize different scheduling configurations for scheduling communications between the network and UEs, including “proportional fair (PF)” and “round robin (RR)” scheduling configurations. However, these techniques may be deficient in that they do not take into account packet expiration information at the UE, which may result in dropped packets, and increased latency. 
     SUMMARY 
     The described techniques relate to improved methods, systems, devices, and apparatuses that support techniques for deadline-aware scheduling (DAS). Generally, aspects of the present disclosure provide techniques which enable user equipments (UEs) to signal packet expiration times (e.g., packet deadline information) to the network. In particular, aspects of the present disclosure support techniques for signaling packet expiration time to the network, which may enable the network to perform DAS. For example, a UE may generate a set of data packets, where each data packet is associated with a packet expiration time. The UE may then transmit expiration information to the base station, where the packet expiration information is calculated based on the packet expiration times (e.g., calculated as a minimum, maximum, median, mean of the packet expiration times). The UE may then receive scheduling information which is determined based on the packet expiration information, and may transmit the data packets in accordance with the scheduling information and the packet expiration times. As such, by enabling UEs to signal packet expiration information to the network, the network may be able to take packet deadline information into account when scheduling communications at the respective UEs, which may reduce dropped packets, decrease latency, improve resource utilization, and increase system capacity. 
     A method for wireless communication at a UE is described. The method may include generating a set of multiple data packets that are to be transmitted to a base station, where each data packet of the set of multiple data packets is associated with a respective packet expiration time, transmitting, to the base station, an indication of packet expiration information associated with the set of multiple data packets, where the packet expiration information is based on a set of multiple packet expiration times associated with the set of multiple data packets, receiving, from the base station, scheduling information associated with at least a subset of the set of multiple data packets, where the scheduling information is based on the packet expiration information, and transmitting at least one data packet of the subset of the set of multiple data packets to the base station in accordance with the scheduling information. 
     An apparatus for wireless communication at a UE is described. The apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to generate a set of multiple data packets that are to be transmitted to a base station, where each data packet of the set of multiple data packets is associated with a respective packet expiration time, transmit, to the base station, an indication of packet expiration information associated with the set of multiple data packets, where the packet expiration information is based on a set of multiple packet expiration times associated with the set of multiple data packets, receive, from the base station, scheduling information associated with at least a subset of the set of multiple data packets, where the scheduling information is based on the packet expiration information, and transmit at least one data packet of the subset of the set of multiple data packets to the base station in accordance with the scheduling information. 
     Another apparatus for wireless communication at a UE is described. The apparatus may include means for generating a set of multiple data packets that are to be transmitted to a base station, where each data packet of the set of multiple data packets is associated with a respective packet expiration time, means for transmitting, to the base station, an indication of packet expiration information associated with the set of multiple data packets, where the packet expiration information is based on a set of multiple packet expiration times associated with the set of multiple data packets, means for receiving, from the base station, scheduling information associated with at least a subset of the set of multiple data packets, where the scheduling information is based on the packet expiration information, and means for transmitting at least one data packet of the subset of the set of multiple data packets to the base station in accordance with the scheduling information. 
     A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor to generate a set of multiple data packets that are to be transmitted to a base station, where each data packet of the set of multiple data packets is associated with a respective packet expiration time, transmit, to the base station, an indication of packet expiration information associated with the set of multiple data packets, where the packet expiration information is based on a set of multiple packet expiration times associated with the set of multiple data packets, receive, from the base station, scheduling information associated with at least a subset of the set of multiple data packets, where the scheduling information is based on the packet expiration information, and transmit at least one data packet of the subset of the set of multiple data packets to the base station in accordance with the scheduling information. 
     Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, from the base station, control signaling including an indication of a periodicity associated with a set of multiple transmission occasions for communicating the packet expiration information, where the indication of the packet expiration information may be transmitted in accordance with the indicated periodicity and within a transmission occasion of the set of multiple transmission occasions. 
     Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, from the base station, control signaling including an indication of one or more trigger conditions for communicating the packet expiration information, where transmitting the indication of the packet expiration information may be based on a satisfaction of the one or more trigger conditions. 
     In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the satisfaction of the one or more trigger conditions may be based on a packet expiration time of the set of multiple packet expiration times satisfying a duration threshold, a change in the packet expiration information satisfying some change threshold, a quality of service (QoS) requirement at the UE satisfying a threshold quality, a processing capability of the UE satisfying a processing capability threshold, or any combination thereof. 
     Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, from the base station, a request for the packet expiration information, where the indication of the packet expiration information may be transmitted in response to the request. 
     In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the request may be received via a downlink control information (DCI) message, a medium access control-control element (MAC-CE) message, or both. 
     Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining the packet expiration information in accordance with a packet expiry configuration, the packet expiry configuration including one or more mathematical operations for determining the packet expiration information based on the set of multiple packet expiration times. 
     Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, from the base station, a control message indicating the packet expiry configuration, where determining the packet expiration information may be based on receiving the control message. 
     Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving, from the base station, additional control signaling indicating a set of multiple packet expiry configurations including the packet expiry configuration, where the control message may be received based on receiving the additional control signaling, and where determining the packet expiration information may be based on receiving the additional control signaling. 
     In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, determining the packet expiration information in accordance with the packet expiry configuration may include operations, features, means, or instructions for determining an average of the set of multiple packet expiration times, a median of the set of multiple packet expiration times, a minimum of the set of multiple packet expiration times, a maximum of the set of multiple packet expiration times, or any combination thereof. 
     In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the at least one data packet of the set of multiple data packets may include operations, features, means, or instructions for identifying that a first data packet of the set of multiple data packets may be valid based on the scheduling information and a first packet expiration time corresponding to the first data packet and transmitting the first data packet based on identifying that the first data packet may be valid, where the at least one transmitted data packet includes the first data packet. 
     Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for identifying that a second data packet of the set of multiple data packets may be expired based on the scheduling information and a second packet expiration time corresponding to the second data packet and refraining from transmitting the second data packet based on identifying that the second data packet may be expired. 
     Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for discarding the second data packet from a transmission buffer at the UE based on identifying that the second data packet may be expired, where refraining from transmitting the second data packet may be based on discarding the second data packet. 
     In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the indication of the packet expiration information may be transmitted via an uplink control information (UCI) message, a MAC-CE message, or both. 
     A method for wireless communication at a base station is described. The method may include receiving, from a UE, an indication of packet expiration information associated with a set of multiple data packets generated by the UE, where the packet expiration information is based on a set of multiple packet expiration times associated with the set of multiple data packets, transmitting, to the UE, scheduling information associated with at least a subset of the set of multiple data packets, where the scheduling information is based on the packet expiration information, and receiving at least one data packet of the subset of the set of multiple data packets from the UE in accordance with the scheduling information. 
     An apparatus for wireless communication at a base station is described. The apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to receive, from a UE, an indication of packet expiration information associated with a set of multiple data packets generated by the UE, where the packet expiration information is based on a set of multiple packet expiration times associated with the set of multiple data packets, transmit, to the UE, scheduling information associated with at least a subset of the set of multiple data packets, where the scheduling information is based on the packet expiration information, and receive at least one data packet of the subset of the set of multiple data packets from the UE in accordance with the scheduling information. 
     Another apparatus for wireless communication at a base station is described. The apparatus may include means for receiving, from a UE, an indication of packet expiration information associated with a set of multiple data packets generated by the UE, where the packet expiration information is based on a set of multiple packet expiration times associated with the set of multiple data packets, means for transmitting, to the UE, scheduling information associated with at least a subset of the set of multiple data packets, where the scheduling information is based on the packet expiration information, and means for receiving at least one data packet of the subset of the set of multiple data packets from the UE in accordance with the scheduling information. 
     A non-transitory computer-readable medium storing code for wireless communication at a base station is described. The code may include instructions executable by a processor to receive, from a UE, an indication of packet expiration information associated with a set of multiple data packets generated by the UE, where the packet expiration information is based on a set of multiple packet expiration times associated with the set of multiple data packets, transmit, to the UE, scheduling information associated with at least a subset of the set of multiple data packets, where the scheduling information is based on the packet expiration information, and receive at least one data packet of the subset of the set of multiple data packets from the UE in accordance with the scheduling information. 
     Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining a DAS metric associated with the UE based on the packet expiration information, an instantaneous achievable data rate at the UE, an average throughput at the UE, or any combination thereof, where transmitting the scheduling information may be based on the DAS metric. 
     Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving feedback information from the UE, where the instantaneous achievable data rate, the average throughput, or both, may be based on the feedback information. 
     In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving the indication of the packet expiration information may include operations, features, means, or instructions for receiving an indication of packet expiration information associated with a set of multiple UEs including the UE and determining a set of multiple DAS metrics associated with the set of multiple UEs based on received packet expiration information corresponding to each UE of the set of multiple UEs, where transmitting the scheduling information may be based on the set of multiple DAS metrics. 
     Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting, to the UE, control signaling including an indication of a periodicity associated with a set of multiple transmission occasions for communicating the packet expiration information, where the indication of the packet expiration information may be received in accordance with the indicated periodicity and within a transmission occasion of the set of multiple transmission occasions. 
     Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting, to the UE, control signaling including an indication of one or more trigger conditions for communicating the packet expiration information, where receiving the indication of the packet expiration information may be based on a satisfaction of the one or more trigger conditions. 
     In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the satisfaction of the one or more trigger conditions may be based on a packet expiration time of the set of multiple packet expiration times satisfying a duration threshold, a change in the packet expiration information satisfying some change threshold, a QoS requirement at the UE satisfying a threshold quality, a processing capability of the UE satisfying a processing capability threshold, or any combination thereof. 
     Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting, to the UE, a request for the packet expiration information, where the indication of the packet expiration information may be received in response to the request. 
     In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the request may be transmitted via a DCI message, a MAC-CE message, or both. 
     Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting, to the UE, a control message indicating a packet expiry configuration, where the packet expiration information may be determined in accordance with the packet expiry configuration, the packet expiry configuration including one or more mathematical operations for determining the packet expiration information based on the set of multiple packet expiration times. 
     Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting, to the UE, additional control signaling indicating a set of multiple packet expiry configurations including the packet expiry configuration, where the control message may be transmitted based on transmitting the additional control signaling. 
     In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the indication of the packet expiration information may be received via a UCI message, a MAC-CE message, or both. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    illustrates an example of a wireless communications system that supports techniques for deadline-aware scheduling (DAS) in accordance with aspects of the present disclosure. 
         FIG.  2    illustrates an example of a wireless communications system that supports techniques for DAS in accordance with aspects of the present disclosure. 
         FIG.  3    illustrates an example of a process flow that supports techniques for DAS in accordance with aspects of the present disclosure. 
         FIGS.  4  and  5    show block diagrams of devices that support techniques for DAS in accordance with aspects of the present disclosure. 
         FIG.  6    shows a block diagram of a communications manager that supports techniques for DAS in accordance with aspects of the present disclosure. 
         FIG.  7    shows a diagram of a system including a device that supports techniques for DAS in accordance with aspects of the present disclosure. 
         FIGS.  8  and  9    show block diagrams of devices that support techniques for DAS in accordance with aspects of the present disclosure. 
         FIG.  10    shows a block diagram of a communications manager that supports techniques for DAS in accordance with aspects of the present disclosure. 
         FIG.  11    shows a diagram of a system including a device that supports techniques for DAS in accordance with aspects of the present disclosure. 
         FIGS.  12  through  16    show flowcharts illustrating methods that support techniques for DAS in accordance with aspects of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Wireless communications systems may utilize different scheduling configurations for scheduling communications between the network and user equipments (UEs), including “proportional fair (PF)” and “round robin (RR)” scheduling configurations. For example, using a PF scheduling configuration, a base station may schedule communications at UEs based on an average throughput and an instantaneous achievable data rate for each respective UE. However, conventional wireless communications systems do not support “deadline-aware scheduling” (DAS) configurations which take into account deadline information (e.g., expiration information) of data packets at the UE. In particular, data packets generated by a UE may be associated with packet expiration times, which indicate a duration of time in which each respective data packet is valid and must be sent before the data packet becomes expired and is “dropped.” Without taking packet expiration information at UEs into account, conventional scheduling techniques may result in large quantities of data packets being dropped by the UEs, which may lead to increased latency and wasted communications resources. 
     Accordingly, aspects of the present disclosure are directed to techniques which enable UEs to signal packet expiration times (e.g., packet deadline information) to the network. In particular, aspects of the present disclosure support techniques for signaling packet expiration time to the network, which may enable the network to perform DAS. For the purposes of the present disclosure, the term “DAS” may be used to refer to configurations and techniques for scheduling wireless communications which take into account packet expiration times (e.g., packet deadline information). 
     For example, a UE may generate a set of data packets, where each data packet is associated with a packet expiration time. The UE may then transmit expiration information to the base station, where the packet expiration information is calculated based on the packet expiration times (e.g., calculated as a minimum, maximum, median, mean of the packet expiration times). The UE may then receive scheduling information which is determined based on the packet expiration information, and may transmit the data packets in accordance with the scheduling information and the packet expiration times. As such, by enabling UEs to signal packet expiration information to the network, the network may be able to take packet deadline information into account when scheduling communications at the respective UEs, which may reduce dropped packets, decrease latency, and improve resource utilization. 
     In some cases, the UE may be configured to transmit packet expiration information in response to a request from the base station, periodically within pre-configured transmission occasions, and/or aperiodically based on some trigger condition (e.g., significant change in packet expiration information). The UE may calculate the packet expiration information based on the packet expiration times using a “packet expiry configuration,” which may be pre-configured at the UE, signaled to the UE via radio resource control (RRC) and/or downlink control information (DCI) signaling, or both. Moreover, the network may be configured to calculate a DAS metric for each UE based on packet expiration information received from each UE and other characteristics (e.g., average throughput, instantaneous achievable data rate), and may rank and schedule the UEs based on their corresponding DAS metrics. 
     Aspects of the disclosure are initially described in the context of wireless communications systems. Additional aspects of the disclosure are described in the context of an example process flow. Aspects of the disclosure are further illustrated by and described herein with reference to apparatus diagrams, system diagrams, and flowcharts that relate to techniques for DAS. 
       FIG.  1    illustrates an example of a wireless communications system  100  that supports techniques for DAS in accordance with aspects of the present disclosure. The wireless communications system  100  may include one or more base stations  105 , one or more UEs  115 , and a core network  130 . In some examples, the wireless communications system  100  may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, or a New Radio (NR) network. In some examples, the wireless communications system  100  may support enhanced broadband communications, ultra-reliable communications, low latency communications, communications with low-cost and low-complexity devices, or any combination thereof. 
     The base stations  105  may be dispersed throughout a geographic area to form the wireless communications system  100  and may be devices in different forms or having different capabilities. The base stations  105  and the UEs  115  may wirelessly communicate via one or more communication links  125 . Each base station  105  may provide a geographic coverage area  110  over which the UEs  115  and the base station  105  may establish one or more communication links  125 . The geographic coverage area  110  may be an example of a geographic area over which a base station  105  and a UE  115  may support the communication of signals according to one or more radio access technologies. 
     The UEs  115  may be dispersed throughout a geographic coverage area  110  of the wireless communications system  100 , and each UE  115  may be stationary, or mobile, or both at different times. The UEs  115  may be devices in different forms or having different capabilities. Some example UEs  115  are illustrated in  FIG.  1   . The UEs  115  described herein may be able to communicate with various types of devices, such as other UEs  115 , the base stations  105 , or network equipment (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network equipment), as shown in  FIG.  1   . 
     The base stations  105  may communicate with the core network  130 , or with one another, or both. For example, the base stations  105  may interface with the core network  130  through one or more backhaul links  120  (e.g., via an S1, N2, N3, or other interface). The base stations  105  may communicate with one another over the backhaul links  120  (e.g., via an X2, Xn, or other interface) either directly (e.g., directly between base stations  105 ), or indirectly (e.g., via core network  130 ), or both. In some examples, the backhaul links  120  may be or include one or more wireless links. 
     One or more of the base stations  105  described herein may include or may be referred to by a person having ordinary skill in the art as a base transceiver station, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB), a next-generation NodeB or a giga-NodeB (either of which may be referred to as a gNB), a Home NodeB, a Home eNodeB, or other suitable terminology. 
     A UE  115  may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where the “device” may also be referred to as a unit, a station, a terminal, or a client, among other examples. A UE  115  may also include or may be referred to as a personal electronic device such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, a UE  115  may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communications (MTC) device, among other examples, which may be implemented in various objects such as appliances, or vehicles, meters, among other examples. 
     The UEs  115  described herein may be able to communicate with various types of devices, such as other UEs  115  that may sometimes act as relays as well as the base stations  105  and the network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, as shown in  FIG.  1   . 
     The UEs  115  and the base stations  105  may wirelessly communicate with one another via one or more communication links  125  over one or more carriers. The term “carrier” may refer to a set of radio frequency spectrum resources having a defined physical layer structure for supporting the communication links  125 . For example, a carrier used for a communication link  125  may include a portion of a radio frequency spectrum band (e.g., a bandwidth part (BWP)) that is operated according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling that coordinates operation for the carrier, user data, or other signaling. The wireless communications system  100  may support communication with a UE  115  using carrier aggregation or multi-carrier operation. A UE  115  may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used with both frequency division duplexing (FDD) and time division duplexing (TDD) component carriers. 
     In some examples (e.g., in a carrier aggregation configuration), a carrier may also have acquisition signaling or control signaling that coordinates operations for other carriers. A carrier may be associated with a frequency channel (e.g., an evolved universal mobile telecommunication system terrestrial radio access (E-UTRA) absolute radio frequency channel number (EARFCN)) and may be positioned according to a channel raster for discovery by the UEs  115 . A carrier may be operated in a standalone mode where initial acquisition and connection may be conducted by the UEs  115  via the carrier, or the carrier may be operated in a non-standalone mode where a connection is anchored using a different carrier (e.g., of the same or a different radio access technology). 
     The communication links  125  shown in the wireless communications system  100  may include uplink transmissions from a UE  115  to a base station  105 , or downlink transmissions from a base station  105  to a UE  115 . Carriers may carry downlink or uplink communications (e.g., in an FDD mode) or may be configured to carry downlink and uplink communications (e.g., in a TDD mode). 
     A carrier may be associated with a particular bandwidth of the radio frequency spectrum, and in some examples the carrier bandwidth may be referred to as a “system bandwidth” of the carrier or the wireless communications system  100 . For example, the carrier bandwidth may be one of a number of determined bandwidths for carriers of a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz)). Devices of the wireless communications system  100  (e.g., the base stations  105 , the UEs  115 , or both) may have hardware configurations that support communications over a particular carrier bandwidth or may be configurable to support communications over one of a set of carrier bandwidths. In some examples, the wireless communications system  100  may include base stations  105  or UEs  115  that support simultaneous communications via carriers associated with multiple carrier bandwidths. In some examples, each served UE  115  may be configured for operating over portions (e.g., a sub-band, a BWP) or all of a carrier bandwidth. 
     Signal waveforms transmitted over a carrier may be made up of multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system employing MCM techniques, a resource element may consist of one symbol period (e.g., a duration of one modulation symbol) and one subcarrier, where the symbol period and subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both). Thus, the more resource elements that a UE  115  receives and the higher the order of the modulation scheme, the higher the data rate may be for the UE  115 . A wireless communications resource may refer to a combination of a radio frequency spectrum resource, a time resource, and a spatial resource (e.g., spatial layers or beams), and the use of multiple spatial layers may further increase the data rate or data integrity for communications with a UE  115 . 
     One or more numerologies for a carrier may be supported, where a numerology may include a subcarrier spacing (Δ/f) and a cyclic prefix. A carrier may be divided into one or more BWPs having the same or different numerologies. In some examples, a UE  115  may be configured with multiple BWPs. In some examples, a single BWP for a carrier may be active at a given time and communications for the UE  115  may be restricted to one or more active BWPs. 
     The time intervals for the base stations  105  or the UEs  115  may be expressed in multiples of a basic time unit which may, for example, refer to a sampling period of T s =1/(Δf max ·N f ) seconds, where Δf max  may represent the maximum supported subcarrier spacing, and N f  may represent the maximum supported discrete Fourier transform (DFT) size. Time intervals of a communications resource may be organized according to radio frames each having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023). 
     Each frame may include multiple consecutively numbered subframes or slots, and each subframe or slot may have the same duration. In some examples, a frame may be divided (e.g., in the time domain) into subframes, and each subframe may be further divided into a number of slots. Alternatively, each frame may include a variable number of slots, and the number of slots may depend on subcarrier spacing. Each slot may include a number of symbol periods (e.g., depending on the length of the cyclic prefix prepended to each symbol period). In some wireless communications systems  100 , a slot may further be divided into multiple mini-slots containing one or more symbols. Excluding the cyclic prefix, each symbol period may contain one or more (e.g., N f ) sampling periods. The duration of a symbol period may depend on the subcarrier spacing or frequency band of operation. 
     A subframe, a slot, a mini-slot, or a symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communications system  100  and may be referred to as a transmission time interval (TTI). In some examples, the TTI duration (e.g., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communications system  100  may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs)). 
     Physical channels may be multiplexed on a carrier according to various techniques. A physical control channel and a physical data channel may be multiplexed on a downlink carrier, for example, using one or more of time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques. A control region (e.g., a control resource set (CORESET)) for a physical control channel may be defined by a number of symbol periods and may extend across the system bandwidth or a subset of the system bandwidth of the carrier. One or more control regions (e.g., CORESETs) may be configured for a set of the UEs  115 . For example, one or more of the UEs  115  may monitor or search control regions for control information according to one or more search space sets, and each search space set may include one or multiple control channel candidates in one or more aggregation levels arranged in a cascaded manner. An aggregation level for a control channel candidate may refer to a number of control channel resources (e.g., control channel elements (CCEs)) associated with encoded information for a control information format having a given payload size. Search space sets may include common search space sets configured for sending control information to multiple UEs  115  and UE-specific search space sets for sending control information to a specific UE  115 . 
     In some examples, a base station  105  may be movable and therefore provide communication coverage for a moving geographic coverage area  110 . In some examples, different geographic coverage areas  110  associated with different technologies may overlap, but the different geographic coverage areas  110  may be supported by the same base station  105 . In other examples, the overlapping geographic coverage areas  110  associated with different technologies may be supported by different base stations  105 . The wireless communications system  100  may include, for example, a heterogeneous network in which different types of the base stations  105  provide coverage for various geographic coverage areas  110  using the same or different radio access technologies. 
     The wireless communications system  100  may be configured to support ultra-reliable communications or low-latency communications, or various combinations thereof. For example, the wireless communications system  100  may be configured to support ultra-reliable low-latency communications (URLLC). The UEs  115  may be designed to support ultra-reliable, low-latency, or critical functions. Ultra-reliable communications may include private communication or group communication and may be supported by one or more services such as push-to-talk, video, or data. Support for ultra-reliable, low-latency functions may include prioritization of services, and such services may be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, and ultra-reliable low-latency may be used interchangeably herein. 
     In some examples, a UE  115  may also be able to communicate directly with other UEs  115  over a device-to-device (D2D) communication link  135  (e.g., using a peer-to-peer (P2P) or D2D protocol). One or more UEs  115  utilizing D2D communications may be within the geographic coverage area  110  of a base station  105 . Other UEs  115  in such a group may be outside the geographic coverage area  110  of a base station  105  or be otherwise unable to receive transmissions from a base station  105 . In some examples, groups of the UEs  115  communicating via D2D communications may utilize a one-to-many (1:M) system in which each UE  115  transmits to every other UE  115  in the group. In some examples, a base station  105  facilitates the scheduling of resources for D2D communications. In other cases, D2D communications are carried out between the UEs  115  without the involvement of a base station  105 . 
     The core network  130  may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network  130  may be an evolved packet core (EPC) or 5G core (5GC), which may include at least one control plane entity that manages access and mobility (e.g., a mobility management entity (MME), an access and mobility management function (AMF)) and at least one user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW), a Packet Data Network (PDN) gateway (P-GW), or a user plane function (UPF)). The control plane entity may manage non-access stratum (NAS) functions such as mobility, authentication, and bearer management for the UEs  115  served by the base stations  105  associated with the core network  130 . User IP packets may be transferred through the user plane entity, which may provide IP address allocation as well as other functions. The user plane entity may be connected to IP services  150  for one or more network operators. The IP services  150  may include access to the Internet, Intranet(s), an IP Multimedia Subsystem (IMS), or a Packet-Switched Streaming Service. 
     Some of the network devices, such as a base station  105 , may include subcomponents such as an access network entity  140 , which may be an example of an access node controller (ANC). Each access network entity  140  may communicate with the UEs  115  through one or more other access network transmission entities  145 , which may be referred to as radio heads, smart radio heads, or transmission/reception points (TRPs). Each access network transmission entity  145  may include one or more antenna panels. In some configurations, various functions of each access network entity  140  or base station  105  may be distributed across various network devices (e.g., radio heads and ANCs) or consolidated into a single network device (e.g., a base station  105 ). 
     The wireless communications system  100  may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Generally, the region from 300 MHz to 3 GHz is known as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately one decimeter to one meter in length. The UHF waves may be blocked or redirected by buildings and environmental features, but the waves may penetrate structures sufficiently for a macro cell to provide service to the UEs  115  located indoors. The transmission of UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) compared to transmission using the smaller frequencies and longer waves of the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz. 
     The wireless communications system  100  may utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communications system  100  may employ License Assisted Access (LAA), LTE-Unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band such as the 5 GHz industrial, scientific, and medical (ISM) band. When operating in unlicensed radio frequency spectrum bands, devices such as the base stations  105  and the UEs  115  may employ carrier sensing for collision detection and avoidance. In some examples, operations in unlicensed bands may be based on a carrier aggregation configuration in conjunction with component carriers operating in a licensed band (e.g., LAA). Operations in unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among other examples. 
     A base station  105  or a UE  115  may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of a base station  105  or a UE  115  may be located within one or more antenna arrays or antenna panels, which may support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some examples, antennas or antenna arrays associated with a base station  105  may be located in diverse geographic locations. A base station  105  may have an antenna array with a number of rows and columns of antenna ports that the base station  105  may use to support beamforming of communications with a UE  115 . Likewise, a UE  115  may have one or more antenna arrays that may support various MIMO or beamforming operations. Additionally or alternatively, an antenna panel may support radio frequency beamforming for a signal transmitted via an antenna port. 
     The base stations  105  or the UEs  115  may use MIMO communications to exploit multipath signal propagation and increase the spectral efficiency by transmitting or receiving multiple signals via different spatial layers. Such techniques may be referred to as spatial multiplexing. The multiple signals may, for example, be transmitted by the transmitting device via different antennas or different combinations of antennas. Likewise, the multiple signals may be received by the receiving device via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers may be associated with different antenna ports used for channel measurement and reporting. MIMO techniques include single-user MIMO (SU-MIMO), where multiple spatial layers are transmitted to the same receiving device, and multiple-user MIMO (MU-MIMO), where multiple spatial layers are transmitted to multiple devices. 
     Beamforming, which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station  105 , a UE  115 ) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining the signals communicated via antenna elements of an antenna array such that some signals propagating at particular orientations with respect to an antenna array experience constructive interference while others experience destructive interference. The adjustment of signals communicated via the antenna elements may include a transmitting device or a receiving device applying amplitude offsets, phase offsets, or both to signals carried via the antenna elements associated with the device. The adjustments associated with each of the antenna elements may be defined by a beamforming weight set associated with a particular orientation (e.g., with respect to the antenna array of the transmitting device or receiving device, or with respect to some other orientation). 
     A base station  105  or a UE  115  may use beam sweeping techniques as part of beam forming operations. For example, a base station  105  may use multiple antennas or antenna arrays (e.g., antenna panels) to conduct beamforming operations for directional communications with a UE  115 . Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted by a base station  105  multiple times in different directions. For example, the base station  105  may transmit a signal according to different beamforming weight sets associated with different directions of transmission. Transmissions in different beam directions may be used to identify (e.g., by a transmitting device, such as a base station  105 , or by a receiving device, such as a UE  115 ) a beam direction for later transmission or reception by the base station  105 . 
     Some signals, such as data signals associated with a particular receiving device, may be transmitted by a base station  105  in a single beam direction (e.g., a direction associated with the receiving device, such as a UE  115 ). In some examples, the beam direction associated with transmissions along a single beam direction may be determined based on a signal that was transmitted in one or more beam directions. For example, a UE  115  may receive one or more of the signals transmitted by the base station  105  in different directions and may report to the base station  105  an indication of the signal that the UE  115  received with a highest signal quality or an otherwise acceptable signal quality. 
     In some examples, transmissions by a device (e.g., by a base station  105  or a UE  115 ) may be performed using multiple beam directions, and the device may use a combination of digital precoding or radio frequency beamforming to generate a combined beam for transmission (e.g., from a base station  105  to a UE  115 ). The UE  115  may report feedback that indicates precoding weights for one or more beam directions, and the feedback may correspond to a configured number of beams across a system bandwidth or one or more sub-bands. The base station  105  may transmit a reference signal (e.g., a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS)), which may be precoded or unprecoded. The UE  115  may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., a multi-panel type codebook, a linear combination type codebook, a port selection type codebook). Although these techniques are described herein with reference to signals transmitted in one or more directions by a base station  105 , a UE  115  may employ similar techniques for transmitting signals multiple times in different directions (e.g., for identifying a beam direction for subsequent transmission or reception by the UE  115 ) or for transmitting a signal in a single direction (e.g., for transmitting data to a receiving device). 
     A receiving device (e.g., a UE  115 ) may try multiple receive configurations (e.g., directional listening) when receiving various signals from the base station  105 , such as synchronization signals, reference signals, beam selection signals, or other control signals. For example, a receiving device may try multiple receive directions by receiving via different antenna subarrays, by processing received signals according to different antenna subarrays, by receiving according to different receive beamforming weight sets (e.g., different directional listening weight sets) applied to signals received at multiple antenna elements of an antenna array, or by processing received signals according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, any of which may be referred to as “listening” according to different receive configurations or receive directions. In some examples, a receiving device may use a single receive configuration to receive along a single beam direction (e.g., when receiving a data signal). The single receive configuration may be aligned in a beam direction determined based on listening according to different receive configuration directions (e.g., a beam direction determined to have a highest signal strength, highest signal-to-noise ratio (SNR), or otherwise acceptable signal quality based on listening according to multiple beam directions). 
     The wireless communications system  100  may be a packet-based network that operates according to a layered protocol stack. In the user plane, communications at the bearer or Packet Data Convergence Protocol (PDCP) layer may be IP-based. A Radio Link Control (RLC) layer may perform packet segmentation and reassembly to communicate over logical channels. A Medium Access Control (MAC) layer may perform priority handling and multiplexing of logical channels into transport channels. The MAC layer may also use error detection techniques, error correction techniques, or both to support retransmissions at the MAC layer to improve link efficiency. In the control plane, the RRC protocol layer may provide establishment, configuration, and maintenance of an RRC connection between a UE  115  and a base station  105  or a core network  130  supporting radio bearers for user plane data. At the physical layer, transport channels may be mapped to physical channels. 
     The UEs  115  and the base stations  105  may support retransmissions of data to increase the likelihood that data is received successfully. Hybrid automatic repeat request (HARQ) feedback is one technique for increasing the likelihood that data is received correctly over a communication link  125 . HARQ may include a combination of error detection (e.g., using a cyclic redundancy check (CRC)), forward error correction (FEC), and retransmission (e.g., automatic repeat request (ARQ)). HARQ may improve throughput at the MAC layer in poor radio conditions (e.g., low signal-to-noise conditions). In some examples, a device may support same-slot HARQ feedback, where the device may provide HARQ feedback in a specific slot for data received in a previous symbol in the slot. In other cases, the device may provide HARQ feedback in a subsequent slot, or according to some other time interval. 
     In some aspects, the UEs  115 , base stations  105 , and other wireless devices of the wireless communications system  100  may support techniques which enable UEs  115  and other wireless devices (e.g., IAB nodes) to signal packet expiration times (e.g., packet deadline information) to the network. In particular, the wireless devices of the wireless communications system  100  may support techniques for signaling packet expiration time to the network, which may enable the network to perform DAS. 
     For example, a UE  115  of the wireless communications system  100  may generate a set of data packets (e.g., data packets to be transmitted to a base station  105 ), where each data packet is associated with a packet expiration time. The UE  115  may then transmit expiration information to the base station, where the packet expiration information is calculated based on the packet expiration times (e.g., calculated as a minimum, maximum, median, mean of the packet expiration times). The UE  115  may then receive scheduling information which is determined based on the packet expiration information, and may transmit the data packets in accordance with the scheduling information and the packet expiration times. As such, by enabling UEs  115  to signal packet expiration information to the network, the network may be able to take packet deadline information into account when scheduling communications at the respective UEs  115 , which may reduce dropped packets, decrease latency, and improve resource utilization. 
     In some cases, the UE  115  may be configured to transmit packet expiration information in response to a request from the base station, periodically within pre-configured transmission occasions, and/or aperiodically based on some trigger condition (e.g., significant change in packet expiration information). The UE  115  may calculate the packet expiration information based on the packet expiration times using a “packet expiry configuration,” which may be pre-configured at the UE  115 , signaled to the UE  115  via RRC and/or DCI signaling, or both. Moreover, the network may be configured to calculate a DAS metric for each UE  115  based on packet expiration information received from each UE  115  and other characteristics (e.g., average throughput, instantaneous achievable data rate), and may rank and schedule the UEs  115  based on their corresponding DAS metrics. 
     Techniques described herein may enable the wireless communications system  100  to support DAS. In particular, by enabling UEs  115  to indicate packet expiration information (e.g., packet deadline information) to the base station  105 , techniques described herein may enable the base station  105  to take the packet expiration information for each respective UE  115  into account when scheduling wireless communications at the respective UEs  115 , which may reduce a quantity and/or frequency of dropped packets at the respective UEs  115 . Moreover, by reducing a quantity and frequency of dropped packets, techniques described herein may reduce a latency of wireless communications, and may lead to more efficient scheduling and a more efficient use of wireless resources. Further, by reducing a quantity and frequency of dropped packets, techniques described herein may improve system capacity within the wireless communications system  100  by enabling the network to support larger quantities of UEs  115  within a given cell. 
       FIG.  2    illustrates an example of a wireless communications system  200  that supports techniques for DAS in accordance with aspects of the present disclosure. In some examples, wireless communications system  200  may implement, or be implemented by, aspects of wireless communications system  100 . The wireless communications system  200  may include a base station  105 - a , a first UE  115 - a , and a second UE  115 - b , which may be examples of base stations  105  and UEs  115  described herein with reference to  FIG.  1   . 
     Each of the UEs  115 - a ,  115 - b  may communicate with the base station  105 - a  using one or more communication links  205 . For example, the first UE  115 - a  may communicate with the base station  105 - a  via a communication link  205 - a , and the second UE  115 - b  may communicate with the base station  105 - b  via a communication link  205 - b . In some cases, the communication links  205 - a ,  205 - b  may include examples of access links (e.g., Uu links). The communication links  205 - a ,  205 - b  may include bi-directional links that can include both uplink and downlink communication. For example, the first UE  115 - a  may transmit uplink transmissions, such as uplink control signals or uplink data signals, to the base station  105 - a  via communication link  205 - a , and the base station  105 - a  may transmit downlink transmissions, such as downlink control signals or downlink data signals, to the first UE  115 - a  via the communication link  205 - a.    
     As noted previously herein, wireless communications systems may utilize different scheduling configurations for scheduling communications between the network and UEs  115 , including PF scheduling configurations and RR scheduling configurations. In particular, according to some scheduling configurations, UEs  115  may be scheduled to transmit and/or receive within respective transmission time intervals (TTIs), where the base station  105  schedules one UE  115  for each respective TTI. Different scheduling configurations may schedule wireless communications based on different scheduling metrics. For example, using a PF scheduling configuration, a base station may schedule communications at UEs  115  based on an average throughput (e.g., average throughput for past T period) and an instantaneous achievable data rate (e.g., instantaneous achievable data rate at the current time/current TTI) for each respective UE  115 . 
     However, conventional wireless communications systems do not support DAS configurations which take into account deadline information (e.g., expiration information) of data packets at each respective UE  115 . In other words, some scheduling configurations implemented by some wireless communications systems do not take into account remaining times to packet expiry for data packets generated at the respective UEs  115 . Data packets with a deadline (e.g., packets with a packet expiration time) which are not transmitted (or received) by the deadline will be dropped. For the purposes of the present disclosure, to data packet may be said to be “dropped” if the data packet is removed from a transmission buffer (e.g., not transmitted), not successfully received by the receiver, ignored or otherwise disregarded by the receiver, or any combination thereof. As such, wireless communications systems which do not take into account packet expiration information at a UE  115  may schedule wireless communications which are inconsistent with the packet expiration information (e.g., schedule data packets after they are already expired), which may result in a higher proportion and/or higher frequency of dropped data packets. F 
     Accordingly, the UEs  115 - a ,  115 - b  and the base station  105 - a  of the wireless communications system  200  may support techniques which enable the UEs  115  to signal packet expiration information to the base station  105 - a , which may enable the base station  105 - a  to perform DAS. By signaling packet expiration information to the base station  105 - a , techniques described herein may enable the base station  105 - a  to take the packet expiration information into account when scheduling wireless communications at each of the respective UEs  115 - a ,  115 - b , which may reduce a quantity/frequency of dropped data packets, reduce latency, and improve resource utilization. 
     For example, as shown in  FIG.  2   , the base station  105 - a  may transmit control signaling  210  to the first UE  115 - a , the second UE  115 - b , or both. The control signaling  210  may include RRC signaling, synchronization signal block (SSB) signaling, DCI messaging, MAC-CE messaging, and the like. In some aspects, the control signaling  210  may include information associated with reporting packet expiration information  240  associated with data packets  220  within a transmission buffer  225  of each respective UE  115 . In this regard, the control signaling  210  may indicate resources for reporting packet expiration information  240 , trigger conditions for reporting packet expiration information  240 , packet expiry configurations usable by the UEs  115  for calculating packet expiration information  240 , or any combination thereof. 
     For example, in some cases, the control signaling  210  may indicate resources (e.g., time resources, frequency resources, spatial resources) usable by the UEs  115  for reporting packet expiration information  240  to the base station  105 - a . In this regard, the control signaling  210  may schedule uplink messages including packet expiration information  240 . For instance, the control signaling  210  may indicate a set of transmission occasions for transmitting packet expiration information  240  to the base station  105 - a . In this example, the control signaling  210  may indicate a periodicity associated with the set of transmission occasions. In other cases, the transmission occasions may be associated with an irregular periodicity. 
     By way of another example, the control signaling  210  may indicate a set of trigger conditions for reporting packet expiration information  240 . In other words, the base station  105 - a  may configure the UEs  115  with a set of trigger conditions that, if satisfied, trigger the UEs  115  to transmit packet expiration information  240  associated with data packets  220  generated by the respective UEs  115 . Trigger conditions may be associated with any number of parameters or characteristics associated with the UEs  115  and/or the wireless communications system  200 , including durations of packet expiration times  230  associated with data packets  220  generated by the UEs  115 , changes in packet expiration information  240  determined by the respective UEs  115 , quality of service (QoS) requirements at the UEs  115 , processing capabilities of the UEs  115 , or any combination thereof. 
     In some aspects, the control signaling  210  may indicate one or more packet expiry configurations for calculating packet expiration information  240  at the UEs  115 . Each packet expiry configuration may define a set of rules or mathematical operations which may be used to calculate packet expiration information  240  based on data packets  220  within a transmission buffer  225  at each respective UE  115 . In this regard, the base station  105 - a  may configure the UEs  115  with one or more packet expiry configurations which may be used to calculate packet expiration information  240  based on packet expiration times  230  of generated data packets  220 . In additional or alternative implementations, the UEs  115  may be configured (e.g., pre-configured) with one or more packet expiry configurations, and may therefore be enabled to calculate packet expiration information  240  without explicit indications of packet expiry configurations from the base station  105 - a.    
     As will be described in further detail herein, the base station  105 - a  may calculate DAS metrics for each respective UE  115  in order to facilitate DAS. DAS metrics calculated by the base station  105 - a  may be based on any number of parameters or characteristics, including packet expiration information  240  for each UE  115  (“e”), an instantaneous achievable data rate for the current TTI (“r”), and an average throughput of each UE  115  for the past T TTIs (“a”), and such, each DAS metric may be a function of e, r, and a (e.g., DASMetric=f (r, a, e)). In some cases, r and a may be estimated/calculated by the base station  105 - a , where e (e.g., packet expiration information  240 ) may have to be reported by the UEs  115 . 
     In some implementations, the first UE  115 - a , the second UE  115 - b , or both, may transmit feedback information  215  to the base station  105 - a . In some cases, the feedback information  215  may be responsive to the control signaling  210 . In additional or alternative implementations, the UEs  115  may transmit the feedback information  215  based on (in response to) other signaling received from the base station  105 - a . The feedback information  215  may include, but is not limited to, modulation and coding scheme (MCS) feedback information, CSI-RS feedback, and the like. 
     In some aspects, the feedback information  215  may include information which enables the base station  105 - a  to determine DAS metrics for the respective UEs  115 . For example, in some implementations, the feedback information  215  may indicate (or may enable the base station  105 - a  to calculate/estimate) an average throughput (e.g., a) and/or an instantaneous achievable data rate (e.g., r) for each respective UE  115 . In such cases, the feedback information  215  (e.g., average throughput, instantaneous achievable data rate) may enable the base station  105 - a  to determine DAS metrics for each respective UE  115 , which may facilitate DAS at the base station  105 - a.    
     The first UE  115 - a , the second UE  115 - b , or both, may generate data packets  220 . Data packets  220  generated by each UE  115  may be contained or otherwise included within a transmission buffer  225  (e.g., data buffer, data packet buffer) for each respective UE  115 . For example, as shown and described in  FIG.  2   , the first UE  115 - a  may generate a set of data packets  220  which are to be transmitted to the base station  105 - a , where the data packets  220  are stored in a transmission buffer  225  of the first UE  115 - a.    
     In some aspects, data packets  220  generated by the UEs  115  may be associated with different deadline information. In other words, each generated data packet  220  may be associated with a respective packet expiration time  230 . For example, as shown in  FIG.  2   , data packets  220  generated by the first UE  115 - a  may be associated with a packet expiration time  230 - a  (e.g., 2 ms), a second packet expiration time  230 - b  (e.g., 3 ms), or a third packet expiration time  230 - c  (e.g., 3 ms). Each where the packet expiration time  230  indicates a time interval or duration in which the respective data packet  220  is valid (e.g., time interval/duration until the respective data packet is dropped). For example, a data packet  220  associated with the first packet expiration time  230 - a  may have to be transmitted within 2 ms of being generated before the data packet  220  is dropped (e.g., 2 ms before the data packet  220  is removed from the transmission buffer  225 ). 
     In some cases, packet expiration times  230  may be associated with a relative priority of the respective data packet  220 . For example, in some cases, higher priority data packets  220  may be associated with smaller/shorter packet expiration times  230 , whereas lower priority data packets  220  may be associated with larger/longer packet expiration times  230 . 
     In some aspects, the base station  105 - a  may transmit a request  235  to the first UE  115 - a , the second UE  115 - b , or both, where the request  235  includes a request  235  for packet expiration information  240  associated with the respective UEs  115 . The request  235  may include a DCI message, a MAC-CE message, or both. In some aspects, the request  235  may indicate a set of resources for transmitting packet expiration information  240  to the base station  105 - a . In this regard, resources for reporting packet expiration information  240  may be indicated via the control signaling  210 , the request  235  (e.g., DCI, MAC-CE), or both. 
     In some aspects, the first UE  115 - a , the second UE  115 - b , or both, may determine packet expiration information  240  (e.g., values of e for calculating DAS metrics) associated with the respective UEs  115 . Each of the UEs  115  may determine the packet expiration information  240  for the respective UEs  115  based on receiving the control signaling  210 , transmitting the feedback information  215 , generating the data packets  220 , receiving the request  235 , or any combination thereof. For example, in some implementations, the first UE  115 - a  may determine packet expiration information  240  for the first UE  115 - a  based on receiving the request  235 . 
     In some aspects, the UEs  115  may determine packet expiration information  240  (e.g., values of e for calculating DAS metrics) corresponding to the respective UEs  115  in accordance with one or more packet expiry configurations. Packet expiry configurations may be signaled to the UEs  115  by the network, pre-configured at the UEs  115 , or both. For example, in some cases, the first UE  115 - a  may determine packet expiration information  240  in accordance with a packet expiry configuration which was indicated via the control signaling  210 . In cases where the control signaling  210  indicated multiple packet expiry configurations, subsequent signaling from the base station  105 - a  may dynamically indicate which packet expiry configuration is to be used. For example, the control signaling  210  may include RRC signaling which indicates multiple packet expiry configurations. In this example, the request  235  and/or other control signaling  210  (e.g., other DCI message, other MAC-CE message) may indicate or select which of the packet expiry configurations is to be used. 
     There may be multiple potential packet expiry configuration options which may be used to determine/characterize remaining time to packet expiry information for each UE  115 . In other words, there may be multiple options for determining/characterizing the value of e (e.g., packet expiration information  240 ) which will be used to determine DAS metrics for the respective UEs  115 . In particular, each packet expiry configuration may indicate rules, mathematical operations, or both, for determining packet expiration information  240  based on packet expiration times  230  of generated data packets  220 . In this regard, packet expiration information  240  may be determined using any number of mathematical operations, including an average/mean, median, maximum, minimum, and the like. 
     For example, in some implementations, the first UE  115 - a  may determine packet expiration information  240  in accordance with an indicated/configured packet expiry configuration by determining an average remaining time to packet expiry of all packets in queue at the UE  115 - a . For instance, in accordance with a first packet expiry configuration, the first UE  115 - a  may determine an average packet expiration time across all data packets  220  within the transmission buffer  225 . In this example, the packet expiration information  240  may be determined as 2.83 ms (e.g., e=(2 ms*4)+(3 ms*6)+(4 ms*2)/12=2.83 ms). 
     In accordance with a second packet expiry configuration, the first UE  115 - a  may determine the packet expiration information  240  as a median packet expiration time of all data packets  220  in the transmission buffer  225  (e.g., e=median{remaining time to expiry}). For instance, in accordance with the second packet expiry configuration, the first UE  115 - a  may determine the packet expiration information  240  to be 3 ms (e.g., e=median{2,2,2,2,3,3,3,3,3,3,4,4}=3 ms). 
     In accordance with a third packet expiry configuration, the first UE  115 - a  may determine the packet expiration information  240  as a maximum packet expiration time of all data packets  220  in the transmission buffer  225  (e.g., e=max{remaining time to expiry}). For instance, in accordance with the third packet expiry configuration, the first UE  115 - a  may determine the packet expiration information  240  to be 4 ms (e.g., e=max{2,2,2,2,3,3,3,3,3,3,4,4}=4 ms). 
     Comparatively, in accordance with a fourth packet expiry configuration, the first UE  115 - a  may determine the packet expiration information  240  as a minimum packet expiration time of all data packets  220  in the transmission buffer  225  (e.g., e=min{remaining time to expiry}). For instance, in accordance with the fourth packet expiry configuration, the first UE  115 - a  may determine the packet expiration information  240  to be 4 ms (e.g., e=min{2,2,2,2,3,3,3,3,3,3,4,4}=2 ms). It is noted herein that the packet expiration information  240  (e.g., value of e) may be calculated using any number or type of mathematical operation or function (e.g., e=f (remaining time to expiry of each packet in queue)). 
     In some aspects, the first UE  115 - a , the second UE  115 - b , or both, may identify a satisfaction of one or more trigger conditions for reporting packet expiration information  240 . In other words, the UEs  115  may identify a satisfaction of one or more trigger conditions for aperiodically reporting packet expiration information  240 . The UEs  115  may identify a satisfaction of a trigger condition for reporting packet expiration information  240  which were configured via the control signaling  210  and/or the request  235 . In this regard, the UEs  115  may identify the satisfaction of the trigger condition(s) based on receiving the control signaling  210 , transmitting the feedback information  215 , generating the data packets  220 , receiving the request  235 , determining the packet expiration information  240 , or any combination thereof. 
     Trigger conditions for reporting packet expiration information  240  may be associated with any number of parameters or characteristics associated with the UEs  115  and/or the wireless communications system, including durations of packet expiration times  230  associated with data packets  220  generated by the UEs  115 , changes in packet expiration information  240  determined by the respective UEs  115 , QoS requirements at the UEs  115 , processing capabilities of the UEs  115 , or any combination thereof. 
     For example, in some cases, the first UE  115 - a  may identify a satisfaction of a trigger condition based on one or more packet expiration times  230  (PETs) at the first UE  115 - a  satisfying some duration threshold (PET Thresh ) (e.g., PET≤PET Thresh ). By way of another example, the first UE  115 - a  may identify a satisfaction of a trigger condition/event based on a change in the packet expiration information  240  satisfying some change threshold (e.g., based on a significant change in determined packet expiration information  240  at the first UE  115 - a ). In other words, a change in the value of e at the UE  115  may trigger aperiodic reporting of e (e.g., aperiodic reporting of packet expiration information  240 ). By way of yet another example, the first UE  115 - a  may identify a satisfaction of a trigger condition based on a QoS requirement at the UE  115 - a  satisfying some threshold quality (e.g., QoS≥QoS Thresh ), a processing capability of the first UE  115 - a  satisfying a processing capability threshold, or any combination thereof. 
     In some aspects, the first UE  115 - a , the second UE  115 - b , or both, may transmit packet expiration information  240  to the base station  105 - a  (e.g., report the value of e). In other words, the UEs  115  may transmit packet expiration information  240  which was determined by the respective UEs  115 . In this regard, the UEs  115  may transmit the packet expiration information  240  based on receiving the control signaling  210 , transmitting the feedback information  215 , generating the data packets  220 , receiving the request  235 , determining the packet expiration information  240 , identifying the satisfaction of a trigger condition(s), or any combination thereof. The UEs  115  may be configured to transmit indications of packet expiration information  240  via an uplink control information (UCI) message, a MAC-CE message, or both. 
     In some aspects, the UEs  115  may transmit the packet expiration information  240  within resources which were signaled/configured via the control signaling  210  and/or the request  235 . For example, in cases where the control signaling  210  indicates a periodicity associated with a set of transmission occasions for reporting packet expiration information  240 , the first UE  115 - a  may transmit the packet expiration information  240  within an indicated transmission occasion and in accordance with the indicated periodicity. In additional or alternative implementations, the UEs  115  may transmit the packet expiration information  240  in response to the request  235 , in response to a satisfaction of one or more trigger conditions, or both. In this regard, the UEs  115  may be configured to transmit packet expiration information  240  periodically, aperiodically, or both. 
     Subsequently, the base station  105 - a  may be configured to determine DAS metrics for the first UE  115 - a , the second UE  115 - b , or both. In general, the base station  105 - d  may be configured to determine/calculate a DAS metric for each respective UE  115  which is served by the base station  105 - a . For example, the base station  105 - a  may be configured to determine a first DAS metric for the first UE  115 - a , and a second DAS metric for the second UE  115 - b.    
     The base station  105 - a  may be configured to utilize received packet expiration information  240  and any number of other parameters or characteristics to determine a DAS metric for each respective UE  115 . For example, in some implementations, the base station  105 - a  may determine a DAS metric for the first UE  115 - a  based on packet expiration information  240  for the first UE  115 - a  (e), an instantaneous achievable data rate at the first UE  115 - a  (r), an average throughput at the first UE  115 - b  (a), or any combination thereof. 
     For example, the base station  105 - a  may be configured to determine a DAS metric for the first UE  115 - a  in accordance with Equation 1: 
       DASMetric= A *( r/a )+ B ( e ) 
     where e is the packet expiration information  240  reported by the first UE  115 - a , r is the instantaneous achievable data rate of the first UE  115 - a  within the current TTI, A is the average throughput at the first UE  115 - a  across some quantity of past TTIs, and A and B are constants which are greater than zero. In this example, the base station  105 - a  may be configured to determine the instantaneous achievable data rate (r), the average throughput, or both, based on the feedback information  215  (e.g., MCS feedback, CSI-RS feedback) received from the first UE  115 - a . Moreover, in the case of aperiodic reporting (e.g., reporting based on a satisfaction of a trigger condition/event), the base station  105 - a  may be configured to utilize a previously-reported value of e (e.g., previously reported packet expiration information  240 ) in order to calculate the DAS metric. 
     In some aspects, the base station  105 - a  may be configured to schedule wireless communications at the respective UEs  115  based on determined DAS metrics corresponding to each respective UE  115 . In other words, the base station  105 - a  may be configured to rank or otherwise order UEs  115  based on (e.g., in accordance with) corresponding DAS metrics in order to prioritize scheduling and resource allocations provided to each respective UE  115 . 
     The base station  105 - a  may transmit scheduling information  245  to the first UE  115 - a , the second UE  115 - b , or both. In particular, the base station  105 - a  may be configured to transmit the scheduling information  245  based on (e.g., in accordance with) the DAS metric(s) for the respective UEs  115 . In this regard, the UEs  115  may receive the scheduling information  245  based on receiving the control signaling  210 , transmitting the feedback information  215 , generating the data packets  220 , receiving the request  235 , determining the packet expiration information  240 , identifying the satisfaction of the trigger condition(s), transmitting the packet expiration information  240 , the determination of the DAS metric(s) at the base station  105 - a , or any combination thereof. 
     The scheduling information  245  may include grants or resource allocations for transmitting one or more of the data packets  220  generated at the respective UEs  115 . In this regard, the scheduling information  245  may be communicated via any message, including a DCI message, a MAC-CE message, and the like. For example, the scheduling information  245  received by the first UE  115 - a  may schedule at least a subset of the data packets  220  generated by the first UE  115 - a . In some implementations, the scheduling information  245  may indicate individual data packets  220  (or sets of data packets  220 ) which are to be transmitted. In additional or alternative implementations, the scheduling information  245  may include a grant of resources which may be used by the first UE  115 - a  to transmit any generated data packet(s). 
     The first UE  115 - a , the second UE  115 - b , or both, may determine whether one or more data packets  220  generated by the respective UEs  115  are valid. For example, the first UE  115 - a  may determine whether a generated data packet is valid based on the received scheduling information  245 , the packet expiration time  230  corresponding to the generated data packet, or both. Subsequently, the first UE  115 - a , the second UE  115 - b , or both, may discard (e.g., drop) expired data packets  220 . For example, the first UE  115 - a , may be configured to drop an expired data packet from the transmission buffer  225  at the first UE  115 - a  based on identifying that the data packet is not valid (e.g., expired). 
     In some aspects, the first UE  115 - a , the second UE  115 - b , or both, may transmit at least one data packet  220  to the base station  105 - a  in accordance with the scheduling information  245  received by each respective UE  115 . For example, the first UE  115 - a  may transmit at least one generated data packet  220  in accordance with time and frequency resources which were allocated to the first UE  115 - a  via the scheduling information  245 . 
     In some implementations, the base station  105 - a  may be configured to activate/deactivate reporting of packet expiration information  240  (e.g., via MAC-CE and/or DCI signaling). The base station  105 - a  may be configured to activate/deactivate remaining time to packet expiry reporting based on UE  115  capabilities, traffic QoS requirements, channel conditions, and the like. Conversely, UEs  115  may be configured to request activation/deactivation of packet expiration information  240  reporting (e.g., via MAC-CE and/or UCI signaling) based on UE  115  capabilities, traffic QoS requirements, channel conditions, and the like. 
     Techniques described herein may enable the wireless communications system to support DAS. In particular, by enabling the UEs  115  to indicate packet expiration information  240  (e.g., packet deadline information) to the base station  105 - a , techniques described herein may enable the base station  105 - a  to take the packet expiration information  240  for each respective UE  115  into account when scheduling wireless communications at the respective UEs  115 , which may reduce a quantity and/or frequency of dropped packets at the respective UEs  115 . Moreover, by reducing a quantity and frequency of dropped packets, techniques described herein may reduce a latency of wireless communications, and may lead to more efficient scheduling and a more efficient use of wireless resources. 
       FIG.  3    illustrates an example of a process flow  300  that supports techniques for DAS in accordance with aspects of the present disclosure. In some examples, process flow  300  may implement, or be implemented by, aspects of wireless communications system  100 , wireless communications system  200 , or both. In particular, the process flow  300  illustrates configurations and signaling which may support DAS. For example, the process flow  300  illustrates a UE  115 - c  transmitting packet expiration information associated with data packets generated at the UE  115 - c , a base station determining DAS metrics for UEs  115  based on received packet expiration information, the UE  115 - c  receiving scheduling information based on the determined DAS metrics, and transmitting data packets in accordance with the received scheduling information, as described as described herein with reference to  FIGS.  1 - 2   , among other aspects. 
     The process flow  300  may include a first UE  115 - c , a second UE  115 - d , and a base station  105 - b , which may be examples of UEs  115  and base stations  105  as described herein with reference to  FIGS.  1 - 2   . For example, the first UE  115 - c  and the base station  105 - b  illustrated in  FIG.  3    may be examples of the first UE  115 - a  and the base station  105 - a , respectively, as illustrated in  FIG.  2   . 
     In some examples, the operations illustrated in process flow  300  may be performed by hardware (e.g., including circuitry, processing blocks, logic components, and other components), code (e.g., software or firmware) executed by a processor, or any combination thereof. Alternative examples of the following may be implemented, where some steps are performed in a different order than described or are not performed at all. In some cases, steps may include additional features not mentioned below, or further steps may be added. 
     At  305 , the base station  105 - b  may transmit control signaling to the first UE  115 - c , the second UE  115 - b , or both. The control signaling may include RRC signaling, SSB signaling, DCI messaging, MAC-CE messaging, and the like. In some aspects, the control signaling may include information associated with reporting packet expiration information to the base station  105 - b , including resources for reporting packet expiration information, trigger conditions for reporting packet expiration information, packet expiry configurations usable by the UEs  115  for calculating packet expiration information, or any combination thereof. 
     For example, in some cases, the control signaling may indicate resources (e.g., time resources, frequency resources, spatial resources) usable by the UEs  115  for reporting packet expiration information to the base station  105 - b . The control signaling may schedule uplink messages. For instance, the control signaling may indicate a set of transmission occasions for transmitting packet expiration information to the base station  105 - b . In this example, the control signaling may indicate a periodicity associated with the set of transmission occasions (e.g., signaling period T). In other cases, the transmission occasions may be associated with an irregular periodicity. 
     By way of another example, the control signaling may indicate a set of trigger conditions for reporting packet expiration information. In other words, the base station  105 - b  may configure the UEs  115  with a set of trigger conditions that, if satisfied, trigger the UEs  115  to transmit packet expiration information associated with data packets generated by the respective UEs  115 . Trigger conditions may be associated with any number of parameters or characteristics associated with the UEs  115  and/or the wireless communications system, including durations of packet expiration times associated with data packets generated by the UEs  115 , changes in packet expiration information determined by the respective UEs  115 , traffic QoS requirements at the UEs  115 , processing capabilities of the UEs  115 , channel conditions, or any combination thereof. 
     In some aspects, the control signaling may indicate one or more packet expiry configurations for calculating packet expiration information at the UEs  115 . Each packet expiry configuration may define a set of rules or mathematical operations which may be used to calculate packet expiration information. In this regard, the base station  105 - b  may configure the UEs  115  with one or more packet expiry configurations which may be used to calculate packet expiration information. In additional or alternative implementations, the UEs  115  may be configured (e.g., pre-configured) with one or more packet expiry configurations, and may therefore be enabled to calculate packet expiration information without explicit indications of packet expiry configurations from the base station  105 - b.    
     At  310 , the first UE  115 - c , the second UE  115 - b , or both, may transmit feedback information to the base station  105 - b . In some cases, the feedback information at  310  may be responsive to the control signaling. In additional or alternative implementations, the UEs  115  may transmit the feedback information based on (in response to) other signaling received from the base station  105 - b . The feedback information may include, but is not limited to, MCS feedback information, CSI-RS feedback, and the like. 
     In some aspects, the feedback information may include information which enables the base station  105 - b  to determine DAS metrics for the respective UEs  115 . For example, in some implementations, the feedback information may indicate (or may enable the base station  105 - b  to calculate) an average throughput and/or an instantaneous achievable data rate for each respective UE  115 . In such cases, the feedback information (e.g., average throughput, instantaneous achievable data rate) may enable the base station  105 - b  to determine DAS metrics for each respective UE  115 , which may facilitate DAS at the base station  105 - b.    
     At  315 , the first UE  115 - c , the second UE  115 - d , or both, may generate data packets. Data packets generated by each UE  115  may be contained or otherwise included within a transmission buffer (e.g., data buffer, data packet buffer) for each respective UE  115 . For example, as shown and described in  FIG.  2   , the first UE  115 - c  may generate a set of data packets which are to be transmitted to the base station  105 - b , where the data packets are stored in a transmission buffer of the first UE  115 - c . In some aspects, data packets generated by the UEs  115  may be associated with a respective packet expiration time, where the packet expiration time indicates a time interval or duration in which the respective data packet is valid (e.g., time interval/duration until the respective data packet is dropped). In some cases, packet expiration times may be associated with a relative priority of the respective data packet. For example, in some cases, higher priority data packets may be associated with smaller/shorter packet expiration times, whereas lower priority data packets may be associated with larger/longer packet expiration times. 
     At  320 , the base station  105 - b  may transmit a request to the first UE  115 - c , the second UE  115 - d , or both, where the request includes a request for packet expiration information associated with the respective UEs  115 . The request may include a DCI message, a MAC-CE message, or both. In some aspects, the request may indicate a set of resources for transmitting packet expiration information to the base station  105 - b . In this regard, resources for reporting packet expiration information may be indicated via the control signaling at  305 , the request (e.g., DCI, MAC-CE) at  320 , or both. 
     At  325 , the first UE  115 - c , the second UE  115 - d , or both, may determine packet expiration information associated with the respective UEs  115 . Each of the UEs  115  may determine the packet expiration information for the respective UEs  115  based on receiving the control signaling at  305 , transmitting the feedback information at  310 , generating the data packets at  315 , receiving the request at  320 , or any combination thereof. For example, in some implementations, the first UE  115 - c  may determine packet expiration information for the first UE  115 - c  based on receiving the request at  320 . In this example, the packet expiration information for the first UE  115 - c  may be based on the data packets generated by the first UE  115 - c  at  315 . 
     In some aspects, the UEs  115  may determine packet expiration information corresponding to the respective UEs  115  in accordance with one or more packet expiry configurations. Packet expiry configurations may be signaled to the UEs  115  by the network, pre-configured at the UEs  115 , or both. For example, in some cases, the first UE  115 - c  may determine packet expiration information in accordance with a packet expiry configuration which was indicated via the control signaling at  305 . In cases where the control signaling at  305  indicated multiple packet expiry configurations, subsequent signaling from the base station  105 - b  may dynamically indicate which packet expiry configuration is to be used. For example, the control signaling may include RRC signaling which indicates multiple packet expiry configurations. In this example, the request and/or other control signaling (e.g., other DCI message, other MAC-CE message) may indicate or select which of the packet expiry configurations is to be used. 
     As noted previously herein, packet expiry configurations may indicate rules, mathematical operations, or both, for determining packet expiry information based on packet expiration times of generated data packets. In this regard, packet expiration information may be determined using any number of mathematical operations, including an average/mean, median, maximum, minimum, and the like. For example, in some implementations, the first UE  115 - c  may determine packet expiration information in accordance with an indicated/configured packet expiry configuration by determining an average/mean packet expiration time of the generated data packets, a median packet expiration time of the generated data packets, a minimum or maximum packet expiration time of the generated data packets, or any combination thereof. 
     At  330 , the first UE  115 - c , the second UE  115 - d , or both, may identify a satisfaction of one or more trigger conditions for reporting packet expiration information. In other words, the UEs  115  may identify a satisfaction of a trigger condition for reporting packet expiration information which were configured via the control signaling at  305  and/or the request at  320 . In this regard, the UEs  115  may identify the satisfaction of the trigger condition(s) at  325  based on receiving the control signaling at  305 , transmitting the feedback information at  310 , generating the data packets at  315 , receiving the request at  320 , determining the packet expiration information at  325 , or any combination thereof. 
     As noted previously herein, trigger conditions for reporting packet expiration information may be associated with any number of parameters or characteristics associated with the UEs  115  and/or the wireless communications system, including durations of packet expiration times associated with data packets generated by the UEs  115 , changes in packet expiration information determined by the respective UEs  115 , traffic QoS requirements at the UEs  115 , processing capabilities of the UEs  115 , channel conditions or any combination thereof. 
     For example, in some cases, the first UE  115 - c  may identify a satisfaction of a trigger condition based on one or more packet expiration times at the first UE  115 - c  satisfying some duration threshold (e.g., PET≤PET Thresh ). By way of another example, the first UE  115 - c  may identify a satisfaction of a trigger condition based on a change in the packet expiration information determined at  325  satisfying some change threshold (e.g., based on a significant change in determined packet expiration information at the first UE  115 - c ). By way of yet another example, the first UE  115 - a  may identify a satisfaction of a trigger condition based on a QoS requirement at the UE  115 - a  satisfying some threshold quality (e.g., QoS≥QoS Thresh ), a processing capability of the first UE  115 - a  satisfying a processing capability threshold, or any combination thereof. 
     At  335 , the first UE  115 - c , the second UE  115 - d , or both, may transmit packet expiration information to the base station  105 - b . In other words, the UEs  115  may transmit packet expiration information which was determined by the respective UEs  115  at  325 . In this regard, the UEs  115  may transmit the packet expiration information at  335  based on receiving the control signaling at  305 , transmitting the feedback information at  310 , generating the data packets at  315 , receiving the request at  320 , determining the packet expiration information at  325 , identifying the satisfaction of a trigger condition(s) at  330 , or any combination thereof. The UEs  115  may be configured to transmit indications of packet expiration information via a UCI message, a MAC-CE message, or both. 
     In some aspects, the UEs  115  may transmit the packet expiration information within resources which were signaled/configured via the control signaling at  305  and/or the request at  320 . For example, in cases where the control signaling indicates a periodicity associated with a set of transmission occasions for reporting packet expiration information, the first UE  115 - a  may transmit the packet expiration information within an indicated transmission occasion and in accordance with the indicated periodicity (e.g., in accordance with the indication of the periodicity). In additional or alternative implementations, the UEs  115  may transmit the packet expiration information in response to the request at  320 , in response to a satisfaction of one or more trigger conditions at  330 , or both. 
     At  340 , the base station  105 - b  may be configured to determine DAS metrics for the first UE  115 - c , the second UE  115 - d , or both. In general, the base station  105 - d  may be configured to determine/calculate a DAS metric for each respective UE  115  which is served by the base station  105 - b . For example, the base station  105 - b  may be configured to determine a first DAS metric for the first UE  115 - c , and a second DAS metric for the second UE  115 - d.    
     The base station  105 - b  may be configured to utilize received packet expiration information and any number of other parameters or characteristics to determine a DAS metric for each respective UE  115 . For example, in some implementations, the base station  105 - b  may determine a DAS metric for the first UE  115 - c  based on packet expiration information for the first UE  115 - c , an instantaneous achievable data rate at the first UE  115 - c , an average throughput at the first UE  115 - d , or any combination thereof. In this example, the base station  105 - b  may be configured to determine the instantaneous achievable data rate, the average throughput, or both, based on the feedback information (e.g., MCS feedback, CSI-RS feedback) received from the first UE  115 - c  at  310 . 
     In some aspects, the base station  105 - b  may be configured to schedule wireless communications at the respective UEs  115  based on determined DAS metrics corresponding to each respective UE  115 . In other words, the base station  105 - b  may be configured to rank or otherwise order UEs  115  based on (e.g., in accordance with) corresponding DAS metrics in order to prioritize scheduling and resource allocations provided to each respective UE  115 . 
     At  345 , the base station  105 - b  may transmit scheduling information to the first UE  115 - c , the second UE  115 - b , or both. In particular, the base station  105 - b  may be configured to transmit the scheduling information based on (e.g., in accordance with) the DAS metric(s) for the respective UEs  115  which were determined at  340 . In this regard, the UEs  115  may receive the scheduling information at  345  based on receiving the control signaling at  305 , transmitting the feedback information at  310 , generating the data packets at  315 , receiving the request at  320 , determining the packet expiration information at  325 , identifying the satisfaction of the trigger condition(s) at  330 , transmitting the packet expiration information at  335 , the determination of the DAS metric(s) at  340 , or any combination thereof. 
     The scheduling information may include grants or resource allocations for transmitting one or more of the data packets generated at the respective UEs  115 . In this regard, the scheduling information may be communicated via any message, including a DCI message, a MAC-CE message, and the like. For example, the scheduling information received by the first UE  115 - c  may schedule at least a subset of the data packets generated by the first UE  115 - c  at  315 . In some implementations, the scheduling information may indicate individual data packets (or sets of data packets) which are to be transmitted. In additional or alternative implementations, the scheduling information may include a grant of resources which may be used by the first UE  115 - c  to transmit any generated data packet(s). 
     At  350 , the first UE  115 - c , the second UE  115 - b , or both, may determine whether one or more data packets generated by the respective UEs  115  are valid. For example, the first UE  115 - c  may determine whether a generated data packet is valid based on the received scheduling information, the packet expiration time corresponding to the generated data packet, or both. In this regard, the UEs  115  may evaluate a validity of data packets based on generating the data packets at  315 , packet expiration times of each respective data packet, receiving the scheduling information at  345 , or any combination thereof. 
     At  355 , the first UE  115 - c , the second UE  115 - d , or both, may discard (e.g., drop) expired data packets. For example, the first UE  115 - c , may be configured to drop an expired data packet from a transmission buffer at the first UE  115 - c  based on identifying that the data packet is not valid (e.g., expired) at  350 . 
     At  360 , the first UE  115 - c , the second UE  115 - d , or both, may transmit at least one data packet to the base station  105 - b  in accordance with the scheduling information received by each respective UE  115  at  345 . For example, the first UE  115 - c  may transmit at least one generated data packet in accordance with time and frequency resources which were allocated to the first UE  115 - c  via the scheduling information at  345 . The UEs  115  may be configured to transmit the data packet(s) at  360  based on receiving the control signaling at  305 , transmitting the feedback information at  310 , generating the data packets at  315 , receiving the request at  320 , determining the packet expiration information at  325 , identifying the satisfaction of the trigger condition(s) at  330 , transmitting the packet expiration information at  335 , the determination of the DAS metric(s) at  340 , receiving the scheduling information at  345 , evaluating the validity of data packets at  350 , dropping expired data packets at  355 , or any combination thereof. 
     Techniques described herein may enable the wireless communications system to support DAS. In particular, by enabling the UEs  115  to indicate packet expiration information (e.g., packet deadline information) to the base station  105 - b , techniques described herein may enable the base station  105 - b  to take the packet expiration information for each respective UE  115  into account when scheduling wireless communications at the respective UEs  115 , which may reduce a quantity and/or frequency of dropped packets at the respective UEs  115 . Moreover, by reducing a quantity and frequency of dropped packets, techniques described herein may reduce a latency of wireless communications, and may lead to more efficient scheduling and a more efficient use of wireless resources. 
       FIG.  4    shows a block diagram  400  of a device  405  that supports techniques for DAS in accordance with aspects of the present disclosure. The device  405  may be an example of aspects of a UE  115  as described herein. The device  405  may include a receiver  410 , a transmitter  415 , and a communications manager  420 . The device  405  may also include a processor (not shown). Each of these components may be in communication with one another (e.g., via one or more buses). 
     The receiver  410  may provide a means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to techniques for DAS). Information may be passed on to other components of the device  405 . The receiver  410  may utilize a single antenna or a set of multiple antennas. 
     The transmitter  415  may provide a means for transmitting signals generated by other components of the device  405 . For example, the transmitter  415  may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to techniques for DAS). In some examples, the transmitter  415  may be co-located with a receiver  410  in a transceiver module. The transmitter  415  may utilize a single antenna or a set of multiple antennas. 
     The communications manager  420 , the receiver  410 , the transmitter  415 , or various combinations thereof or various components thereof may be examples of means for performing various aspects of techniques for DAS as described herein. For example, the communications manager  420 , the receiver  410 , the transmitter  415 , or various combinations or components thereof may support a method for performing one or more of the functions described herein. 
     In some examples, the communications manager  420 , the receiver  410 , the transmitter  415 , or various combinations or components thereof may be implemented in hardware (e.g., in communications management circuitry). The hardware may include a processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting a means for performing the functions described in the present disclosure. In some examples, a processor and memory coupled with the processor may be configured to perform one or more of the functions described herein (e.g., by executing, by the processor, instructions stored in the memory). 
     Additionally or alternatively, in some examples, the communications manager  420 , the receiver  410 , the transmitter  415 , or various combinations or components thereof may be implemented in code (e.g., as communications management software or firmware) executed by a processor. If implemented in code executed by a processor, the functions of the communications manager  420 , the receiver  410 , the transmitter  415 , or various combinations or components thereof may be performed by a general-purpose processor, a DSP, a central processing unit (CPU), an ASIC, an FPGA, or any combination of these or other programmable logic devices (e.g., configured as or otherwise supporting a means for performing the functions described in the present disclosure). 
     In some examples, the communications manager  420  may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the receiver  410 , the transmitter  415 , or both. For example, the communications manager  420  may receive information from the receiver  410 , send information to the transmitter  415 , or be integrated in combination with the receiver  410 , the transmitter  415 , or both to receive information, transmit information, or perform various other operations as described herein. 
     The communications manager  420  may support wireless communication at a UE in accordance with examples as disclosed herein. For example, the communications manager  420  may be configured as or otherwise support a means for generating a set of multiple data packets that are to be transmitted to a base station, where each data packet of the set of multiple data packets is associated with a respective packet expiration time. The communications manager  420  may be configured as or otherwise support a means for transmitting, to the base station, an indication of packet expiration information associated with the set of multiple data packets, where the packet expiration information is based on a set of multiple packet expiration times associated with the set of multiple data packets. The communications manager  420  may be configured as or otherwise support a means for receiving, from the base station, scheduling information associated with at least a subset of the set of multiple data packets, where the scheduling information is based on the packet expiration information. The communications manager  420  may be configured as or otherwise support a means for transmitting at least one data packet of the subset of the set of multiple data packets to the base station in accordance with the scheduling information. 
     By including or configuring the communications manager  420  in accordance with examples as described herein, the device  405  (e.g., a processor controlling or otherwise coupled to the receiver  410 , the transmitter  415 , the communications manager  420 , or a combination thereof) may support techniques which enable wireless communications systems to support DAS. In particular, by enabling the UEs  115  to indicate packet expiration information (e.g., packet deadline information) to the base station  105 - b , techniques described herein may enable the base station  105 - b  to take the packet expiration information for each respective UE  115  into account when scheduling wireless communications at the respective UEs  115 , which may reduce a quantity and/or frequency of dropped packets at the respective UEs  115 . Moreover, by reducing a quantity and frequency of dropped packets, techniques described herein may reduce a latency of wireless communications, and may lead to more efficient scheduling and a more efficient use of wireless resources. 
       FIG.  5    shows a block diagram  500  of a device  505  that supports techniques for DAS in accordance with aspects of the present disclosure. The device  505  may be an example of aspects of a device  405  or a UE  115  as described herein. The device  505  may include a receiver  510 , a transmitter  515 , and a communications manager  520 . The device  505  may also include a processor (not shown). Each of these components may be in communication with one another (e.g., via one or more buses). 
     The receiver  510  may provide a means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to techniques for DAS). Information may be passed on to other components of the device  505 . The receiver  510  may utilize a single antenna or a set of multiple antennas. 
     The transmitter  515  may provide a means for transmitting signals generated by other components of the device  505 . For example, the transmitter  515  may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to techniques for DAS). In some examples, the transmitter  515  may be co-located with a receiver  510  in a transceiver module. The transmitter  515  may utilize a single antenna or a set of multiple antennas. 
     The device  505 , or various components thereof, may be an example of means for performing various aspects of techniques for DAS as described herein. For example, the communications manager  520  may include a data packet generating manager  525 , a packet expiration information manager  530 , a scheduling information receiving manager  535 , a data packet transmitting manager  540 , or any combination thereof. The communications manager  520  may be an example of aspects of a communications manager  420  as described herein. In some examples, the communications manager  520 , or various components thereof, may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the receiver  510 , the transmitter  515 , or both. For example, the communications manager  520  may receive information from the receiver  510 , send information to the transmitter  515 , or be integrated in combination with the receiver  510 , the transmitter  515 , or both to receive information, transmit information, or perform various other operations as described herein. 
     The communications manager  520  may support wireless communication at a UE in accordance with examples as disclosed herein. The data packet generating manager  525  may be configured as or otherwise support a means for generating a set of multiple data packets that are to be transmitted to a base station, where each data packet of the set of multiple data packets is associated with a respective packet expiration time. The packet expiration information manager  530  may be configured as or otherwise support a means for transmitting, to the base station, an indication of packet expiration information associated with the set of multiple data packets, where the packet expiration information is based on a set of multiple packet expiration times associated with the set of multiple data packets. The scheduling information receiving manager  535  may be configured as or otherwise support a means for receiving, from the base station, scheduling information associated with at least a subset of the set of multiple data packets, where the scheduling information is based on the packet expiration information. The data packet transmitting manager  540  may be configured as or otherwise support a means for transmitting at least one data packet of the subset of the set of multiple data packets to the base station in accordance with the scheduling information. 
       FIG.  6    shows a block diagram  600  of a communications manager  620  that supports techniques for DAS in accordance with aspects of the present disclosure. The communications manager  620  may be an example of aspects of a communications manager  420 , a communications manager  520 , or both, as described herein. The communications manager  620 , or various components thereof, may be an example of means for performing various aspects of techniques for DAS as described herein. For example, the communications manager  620  may include a data packet generating manager  625 , a packet expiration information manager  630 , a scheduling information receiving manager  635 , a data packet transmitting manager  640 , a control signaling receiving manager  645 , a request receiving manager  650 , a transmission buffer manager  655 , or any combination thereof. Each of these components may communicate, directly or indirectly, with one another (e.g., via one or more buses). 
     The communications manager  620  may support wireless communication at a UE in accordance with examples as disclosed herein. The data packet generating manager  625  may be configured as or otherwise support a means for generating a set of multiple data packets that are to be transmitted to a base station, where each data packet of the set of multiple data packets is associated with a respective packet expiration time. The packet expiration information manager  630  may be configured as or otherwise support a means for transmitting, to the base station, an indication of packet expiration information associated with the set of multiple data packets, where the packet expiration information is based on a set of multiple packet expiration times associated with the set of multiple data packets. The scheduling information receiving manager  635  may be configured as or otherwise support a means for receiving, from the base station, scheduling information associated with at least a subset of the set of multiple data packets, where the scheduling information is based on the packet expiration information. The data packet transmitting manager  640  may be configured as or otherwise support a means for transmitting at least one data packet of the subset of the set of multiple data packets to the base station in accordance with the scheduling information. 
     In some examples, the control signaling receiving manager  645  may be configured as or otherwise support a means for receiving, from the base station, control signaling including an indication of a periodicity associated with a set of multiple transmission occasions for communicating the packet expiration information, where the indication of the packet expiration information is transmitted in accordance with the indicated periodicity (e.g., in accordance with the indication of the periodicity) and within a transmission occasion of the set of multiple transmission occasions. 
     In some examples, the control signaling receiving manager  645  may be configured as or otherwise support a means for receiving, from the base station, control signaling including an indication of one or more trigger conditions for communicating the packet expiration information, where transmitting the indication of the packet expiration information is based on a satisfaction of the one or more trigger conditions. 
     In some examples, the satisfaction of the one or more trigger conditions is based on a packet expiration time of the set of multiple packet expiration times satisfying a duration threshold, a change in the packet expiration information satisfying some change threshold, a QoS requirement at the UE satisfying a threshold quality, a processing capability of the UE satisfying a processing capability threshold, or any combination thereof. 
     In some examples, the request receiving manager  650  may be configured as or otherwise support a means for receiving, from the base station, a request for the packet expiration information, where the indication of the packet expiration information is transmitted in response to the request. In some examples, the request is received via a DCI message, a MAC-CE message, or both. 
     In some examples, the packet expiration information manager  630  may be configured as or otherwise support a means for determining the packet expiration information in accordance with a packet expiry configuration, the packet expiry configuration including one or more mathematical operations for determining the packet expiration information based on the set of multiple packet expiration times. 
     In some examples, the control signaling receiving manager  645  may be configured as or otherwise support a means for receiving, from the base station, a control message indicating the packet expiry configuration, where determining the packet expiration information is based on receiving the control message. In some examples, the control signaling receiving manager  645  may be configured as or otherwise support a means for receiving, from the base station, additional control signaling indicating a set of multiple packet expiry configurations including the packet expiry configuration, where the control message is received based on receiving the additional control signaling, and where determining the packet expiration information is based on receiving the additional control signaling. 
     In some examples, to support determining the packet expiration information in accordance with the packet expiry configuration, the packet expiration information manager  630  may be configured as or otherwise support a means for determining an average of the set of multiple packet expiration times, a median of the set of multiple packet expiration times, a minimum of the set of multiple packet expiration times, a maximum of the set of multiple packet expiration times, or any combination thereof. 
     In some examples, to support transmitting the at least one data packet of the set of multiple data packets, the transmission buffer manager  655  may be configured as or otherwise support a means for identifying that a first data packet of the set of multiple data packets is valid based on the scheduling information and a first packet expiration time corresponding to the first data packet. In some examples, to support transmitting the at least one data packet of the set of multiple data packets, the data packet transmitting manager  640  may be configured as or otherwise support a means for transmitting the first data packet based on identifying that the first data packet is valid, where the at least one transmitted data packet includes the first data packet. 
     In some examples, the transmission buffer manager  655  may be configured as or otherwise support a means for identifying that a second data packet of the set of multiple data packets is expired based on the scheduling information and a second packet expiration time corresponding to the second data packet. In some examples, the data packet transmitting manager  640  may be configured as or otherwise support a means for refraining from transmitting the second data packet based on identifying that the second data packet is expired. 
     In some examples, the transmission buffer manager  655  may be configured as or otherwise support a means for discarding the second data packet from a transmission buffer at the UE based on identifying that the second data packet is expired, where refraining from transmitting the second data packet is based on discarding the second data packet. In some examples, the indication of the packet expiration information is transmitted via a UCI message, a MAC-CE message, or both. 
       FIG.  7    shows a diagram of a system  700  including a device  705  that supports techniques for DAS in accordance with aspects of the present disclosure. The device  705  may be an example of or include the components of a device  405 , a device  505 , or a UE  115  as described herein. The device  705  may communicate wirelessly with one or more base stations  105 , UEs  115 , or any combination thereof. The device  705  may include components for bi-directional voice and data communications including components for transmitting and receiving communications, such as a communications manager  720 , an input/output (I/O) controller  710 , a transceiver  715 , an antenna  725 , a memory  730 , code  735 , and a processor  740 . These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., a bus  745 ). 
     The I/O controller  710  may manage input and output signals for the device  705 . The I/O controller  710  may also manage peripherals not integrated into the device  705 . In some cases, the I/O controller  710  may represent a physical connection or port to an external peripheral. In some cases, the I/O controller  710  may utilize an operating system such as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS/2®, UNIX®, LINUX®, or another known operating system. Additionally or alternatively, the I/O controller  710  may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device. In some cases, the I/O controller  710  may be implemented as part of a processor, such as the processor  740 . In some cases, a user may interact with the device  705  via the I/O controller  710  or via hardware components controlled by the I/O controller  710 . 
     In some cases, the device  705  may include a single antenna  725 . However, in some other cases, the device  705  may have more than one antenna  725 , which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The transceiver  715  may communicate bi-directionally, via the one or more antennas  725 , wired, or wireless links as described herein. For example, the transceiver  715  may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver  715  may also include a modem to modulate the packets, to provide the modulated packets to one or more antennas  725  for transmission, and to demodulate packets received from the one or more antennas  725 . The transceiver  715 , or the transceiver  715  and one or more antennas  725 , may be an example of a transmitter  415 , a transmitter  515 , a receiver  410 , a receiver  510 , or any combination thereof or component thereof, as described herein. 
     The memory  730  may include random access memory (RAM) and read-only memory (ROM). The memory  730  may store computer-readable, computer-executable code  735  including instructions that, when executed by the processor  740 , cause the device  705  to perform various functions described herein. The code  735  may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some cases, the code  735  may not be directly executable by the processor  740  but may cause a computer (e.g., when compiled and executed) to perform functions described herein. In some cases, the memory  730  may contain, among other things, a basic I/O system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices. 
     The processor  740  may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor  740  may be configured to operate a memory array using a memory controller. In some other cases, a memory controller may be integrated into the processor  740 . The processor  740  may be configured to execute computer-readable instructions stored in a memory (e.g., the memory  730 ) to cause the device  705  to perform various functions (e.g., functions or tasks supporting techniques for DAS). For example, the device  705  or a component of the device  705  may include a processor  740  and memory  730  coupled to the processor  740 , the processor  740  and memory  730  configured to perform various functions described herein. 
     The communications manager  720  may support wireless communication at a UE in accordance with examples as disclosed herein. For example, the communications manager  720  may be configured as or otherwise support a means for generating a set of multiple data packets that are to be transmitted to a base station, where each data packet of the set of multiple data packets is associated with a respective packet expiration time. The communications manager  720  may be configured as or otherwise support a means for transmitting, to the base station, an indication of packet expiration information associated with the set of multiple data packets, where the packet expiration information is based on a set of multiple packet expiration times associated with the set of multiple data packets. The communications manager  720  may be configured as or otherwise support a means for receiving, from the base station, scheduling information associated with at least a subset of the set of multiple data packets, where the scheduling information is based on the packet expiration information. The communications manager  720  may be configured as or otherwise support a means for transmitting at least one data packet of the subset of the set of multiple data packets to the base station in accordance with the scheduling information. 
     By including or configuring the communications manager  720  in accordance with examples as described herein, the device  705  may support techniques which enable wireless communications systems to support DAS. In particular, by enabling the UEs  115  to indicate packet expiration information (e.g., packet deadline information) to the base station  105 - b , techniques described herein may enable the base station  105 - b  to take the packet expiration information for each respective UE  115  into account when scheduling wireless communications at the respective UEs  115 , which may reduce a quantity and/or frequency of dropped packets at the respective UEs  115 . Moreover, by reducing a quantity and frequency of dropped packets, techniques described herein may reduce a latency of wireless communications, and may lead to more efficient scheduling and a more efficient use of wireless resources. 
     In some examples, the communications manager  720  may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the transceiver  715 , the one or more antennas  725 , or any combination thereof. Although the communications manager  720  is illustrated as a separate component, in some examples, one or more functions described herein with reference to the communications manager  720  may be supported by or performed by the processor  740 , the memory  730 , the code  735 , or any combination thereof. For example, the code  735  may include instructions executable by the processor  740  to cause the device  705  to perform various aspects of techniques for DAS as described herein, or the processor  740  and the memory  730  may be otherwise configured to perform or support such operations. 
       FIG.  8    shows a block diagram  800  of a device  805  that supports techniques for DAS in accordance with aspects of the present disclosure. The device  805  may be an example of aspects of a base station  105  as described herein. The device  805  may include a receiver  810 , a transmitter  815 , and a communications manager  820 . The device  805  may also include a processor (not shown). Each of these components may be in communication with one another (e.g., via one or more buses). 
     The receiver  810  may provide a means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to techniques for DAS). Information may be passed on to other components of the device  805 . The receiver  810  may utilize a single antenna or a set of multiple antennas. 
     The transmitter  815  may provide a means for transmitting signals generated by other components of the device  805 . For example, the transmitter  815  may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to techniques for DAS). In some examples, the transmitter  815  may be co-located with a receiver  810  in a transceiver module. The transmitter  815  may utilize a single antenna or a set of multiple antennas. 
     The communications manager  820 , the receiver  810 , the transmitter  815 , or various combinations thereof or various components thereof may be examples of means for performing various aspects of techniques for DAS as described herein. For example, the communications manager  820 , the receiver  810 , the transmitter  815 , or various combinations or components thereof may support a method for performing one or more of the functions described herein. 
     In some examples, the communications manager  820 , the receiver  810 , the transmitter  815 , or various combinations or components thereof may be implemented in hardware (e.g., in communications management circuitry). The hardware may include a processor, a DSP, an ASIC, an FPGA or other programmable logic device, a discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting a means for performing the functions described in the present disclosure. In some examples, a processor and memory coupled with the processor may be configured to perform one or more of the functions described herein (e.g., by executing, by the processor, instructions stored in the memory). 
     Additionally or alternatively, in some examples, the communications manager  820 , the receiver  810 , the transmitter  815 , or various combinations or components thereof may be implemented in code (e.g., as communications management software or firmware) executed by a processor. If implemented in code executed by a processor, the functions of the communications manager  820 , the receiver  810 , the transmitter  815 , or various combinations or components thereof may be performed by a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, or any combination of these or other programmable logic devices (e.g., configured as or otherwise supporting a means for performing the functions described in the present disclosure). 
     In some examples, the communications manager  820  may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the receiver  810 , the transmitter  815 , or both. For example, the communications manager  820  may receive information from the receiver  810 , send information to the transmitter  815 , or be integrated in combination with the receiver  810 , the transmitter  815 , or both to receive information, transmit information, or perform various other operations as described herein. 
     The communications manager  820  may support wireless communication at a base station in accordance with examples as disclosed herein. For example, the communications manager  820  may be configured as or otherwise support a means for receiving, from a UE, an indication of packet expiration information associated with a set of multiple data packets generated by the UE, where the packet expiration information is based on a set of multiple packet expiration times associated with the set of multiple data packets. The communications manager  820  may be configured as or otherwise support a means for transmitting, to the UE, scheduling information associated with at least a subset of the set of multiple data packets, where the scheduling information is based on the packet expiration information. The communications manager  820  may be configured as or otherwise support a means for receiving at least one data packet of the subset of the set of multiple data packets from the UE in accordance with the scheduling information. 
     By including or configuring the communications manager  820  in accordance with examples as described herein, the device  805  (e.g., a processor controlling or otherwise coupled to the receiver  810 , the transmitter  815 , the communications manager  820 , or a combination thereof) may support techniques which enable wireless communications systems to support DAS. In particular, by enabling the UEs  115  to indicate packet expiration information (e.g., packet deadline information) to the base station  105 - b , techniques described herein may enable the base station  105 - b  to take the packet expiration information for each respective UE  115  into account when scheduling wireless communications at the respective UEs  115 , which may reduce a quantity and/or frequency of dropped packets at the respective UEs  115 . Moreover, by reducing a quantity and frequency of dropped packets, techniques described herein may reduce a latency of wireless communications, and may lead to more efficient scheduling and a more efficient use of wireless resources. 
       FIG.  9    shows a block diagram  900  of a device  905  that supports techniques for DAS in accordance with aspects of the present disclosure. The device  905  may be an example of aspects of a device  805  or a base station  105  as described herein. The device  905  may include a receiver  910 , a transmitter  915 , and a communications manager  920 . The device  905  may also include a processor (not shown). Each of these components may be in communication with one another (e.g., via one or more buses). 
     The receiver  910  may provide a means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to techniques for DAS). Information may be passed on to other components of the device  905 . The receiver  910  may utilize a single antenna or a set of multiple antennas. 
     The transmitter  915  may provide a means for transmitting signals generated by other components of the device  905 . For example, the transmitter  915  may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to techniques for DAS). In some examples, the transmitter  915  may be co-located with a receiver  910  in a transceiver module. The transmitter  915  may utilize a single antenna or a set of multiple antennas. 
     The device  905 , or various components thereof, may be an example of means for performing various aspects of techniques for DAS as described herein. For example, the communications manager  920  may include a packet expiration information receiving manager  925 , a scheduling information transmitting manager  930 , a data packet receiving manager  935 , or any combination thereof. The communications manager  920  may be an example of aspects of a communications manager  820  as described herein. In some examples, the communications manager  920 , or various components thereof, may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the receiver  910 , the transmitter  915 , or both. For example, the communications manager  920  may receive information from the receiver  910 , send information to the transmitter  915 , or be integrated in combination with the receiver  910 , the transmitter  915 , or both to receive information, transmit information, or perform various other operations as described herein. 
     The communications manager  920  may support wireless communication at a base station in accordance with examples as disclosed herein. The packet expiration information receiving manager  925  may be configured as or otherwise support a means for receiving, from a UE, an indication of packet expiration information associated with a set of multiple data packets generated by the UE, where the packet expiration information is based on a set of multiple packet expiration times associated with the set of multiple data packets. The scheduling information transmitting manager  930  may be configured as or otherwise support a means for transmitting, to the UE, scheduling information associated with at least a subset of the set of multiple data packets, where the scheduling information is based on the packet expiration information. The data packet receiving manager  935  may be configured as or otherwise support a means for receiving at least one data packet of the subset of the set of multiple data packets from the UE in accordance with the scheduling information. 
       FIG.  10    shows a block diagram  1000  of a communications manager  1020  that supports techniques for DAS in accordance with aspects of the present disclosure. The communications manager  1020  may be an example of aspects of a communications manager  820 , a communications manager  920 , or both, as described herein. The communications manager  1020 , or various components thereof, may be an example of means for performing various aspects of techniques for DAS as described herein. For example, the communications manager  1020  may include a packet expiration information receiving manager  1025 , a scheduling information transmitting manager  1030 , a data packet receiving manager  1035 , a DAS metric manager  1040 , a feedback information receiving manager  1045 , a control signaling transmitting manager  1050 , a request transmitting manager  1055 , or any combination thereof. Each of these components may communicate, directly or indirectly, with one another (e.g., via one or more buses). 
     The communications manager  1020  may support wireless communication at a base station in accordance with examples as disclosed herein. The packet expiration information receiving manager  1025  may be configured as or otherwise support a means for receiving, from a UE, an indication of packet expiration information associated with a set of multiple data packets generated by the UE, where the packet expiration information is based on a set of multiple packet expiration times associated with the set of multiple data packets. The scheduling information transmitting manager  1030  may be configured as or otherwise support a means for transmitting, to the UE, scheduling information associated with at least a subset of the set of multiple data packets, where the scheduling information is based on the packet expiration information. The data packet receiving manager  1035  may be configured as or otherwise support a means for receiving at least one data packet of the subset of the set of multiple data packets from the UE in accordance with the scheduling information. 
     In some examples, the DAS metric manager  1040  may be configured as or otherwise support a means for determining a DAS metric associated with the UE based on the packet expiration information, an instantaneous achievable data rate at the UE, an average throughput at the UE, or any combination thereof, where transmitting the scheduling information is based on the DAS metric. 
     In some examples, the feedback information receiving manager  1045  may be configured as or otherwise support a means for receiving feedback information from the UE, where the instantaneous achievable data rate, the average throughput, or both, are based on the feedback information. 
     In some examples, to support receiving the indication of the packet expiration information, the packet expiration information receiving manager  1025  may be configured as or otherwise support a means for receiving an indication of packet expiration information associated with a set of multiple UEs including the UE. In some examples, to support receiving the indication of the packet expiration information, the DAS metric manager  1040  may be configured as or otherwise support a means for determining a set of multiple DAS metrics associated with the set of multiple UEs based on received packet expiration information corresponding to each UE of the set of multiple UEs, where transmitting the scheduling information is based on the set of multiple DAS metrics. 
     In some examples, the control signaling transmitting manager  1050  may be configured as or otherwise support a means for transmitting, to the UE, control signaling including an indication of a periodicity associated with a set of multiple transmission occasions for communicating the packet expiration information, where the indication of the packet expiration information is received in accordance with the indicated periodicity and within a transmission occasion of the set of multiple transmission occasions. 
     In some examples, the control signaling transmitting manager  1050  may be configured as or otherwise support a means for transmitting, to the UE, control signaling including an indication of one or more trigger conditions for communicating the packet expiration information, where receiving the indication of the packet expiration information is based on a satisfaction of the one or more trigger conditions. In some examples, the satisfaction of the one or more trigger conditions is based on a packet expiration time of the set of multiple packet expiration times satisfying a duration threshold, a change in the packet expiration information satisfying some change threshold, a QoS requirement at the UE satisfying a threshold quality, a processing capability of the UE satisfying a processing capability threshold, or any combination thereof. 
     In some examples, the request transmitting manager  1055  may be configured as or otherwise support a means for transmitting, to the UE, a request for the packet expiration information, where the indication of the packet expiration information is received in response to the request. In some examples, the request is transmitted via a DCI message, a MAC-CE message, or both. 
     In some examples, the control signaling transmitting manager  1050  may be configured as or otherwise support a means for transmitting, to the UE, a control message indicating a packet expiry configuration, where the packet expiration information is determined in accordance with the packet expiry configuration, the packet expiry configuration including one or more mathematical operations for determining the packet expiration information based on the set of multiple packet expiration times. In some examples, the control signaling transmitting manager  1050  may be configured as or otherwise support a means for transmitting, to the UE, additional control signaling indicating a set of multiple packet expiry configurations including the packet expiry configuration, where the control message is transmitted based on transmitting the additional control signaling. In some examples, the indication of the packet expiration information is received via a UCI message, a MAC-CE message, or both. 
       FIG.  11    shows a diagram of a system  1100  including a device  1105  that supports techniques for DAS in accordance with aspects of the present disclosure. The device  1105  may be an example of or include the components of a device  805 , a device  905 , or a base station  105  as described herein. The device  1105  may communicate wirelessly with one or more base stations  105 , UEs  115 , or any combination thereof. The device  1105  may include components for bi-directional voice and data communications including components for transmitting and receiving communications, such as a communications manager  1120 , a network communications manager  1110 , a transceiver  1115 , an antenna  1125 , a memory  1130 , code  1135 , a processor  1140 , and an inter-station communications manager  1145 . These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., a bus  1150 ). 
     The network communications manager  1110  may manage communications with a core network  130  (e.g., via one or more wired backhaul links). For example, the network communications manager  1110  may manage the transfer of data communications for client devices, such as one or more UEs  115 . 
     In some cases, the device  1105  may include a single antenna  1125 . However, in some other cases the device  1105  may have more than one antenna  1125 , which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The transceiver  1115  may communicate bi-directionally, via the one or more antennas  1125 , wired, or wireless links as described herein. For example, the transceiver  1115  may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver  1115  may also include a modem to modulate the packets, to provide the modulated packets to one or more antennas  1125  for transmission, and to demodulate packets received from the one or more antennas  1125 . The transceiver  1115 , or the transceiver  1115  and one or more antennas  1125 , may be an example of a transmitter  815 , a transmitter  915 , a receiver  810 , a receiver  910 , or any combination thereof or component thereof, as described herein. 
     The memory  1130  may include RAM and ROM. The memory  1130  may store computer-readable, computer-executable code  1135  including instructions that, when executed by the processor  1140 , cause the device  1105  to perform various functions described herein. The code  1135  may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some cases, the code  1135  may not be directly executable by the processor  1140  but may cause a computer (e.g., when compiled and executed) to perform functions described herein. In some cases, the memory  1130  may contain, among other things, a BIOS which may control basic hardware or software operation such as the interaction with peripheral components or devices. 
     The processor  1140  may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor  1140  may be configured to operate a memory array using a memory controller. In some other cases, a memory controller may be integrated into the processor  1140 . The processor  1140  may be configured to execute computer-readable instructions stored in a memory (e.g., the memory  1130 ) to cause the device  1105  to perform various functions (e.g., functions or tasks supporting techniques for DAS). For example, the device  1105  or a component of the device  1105  may include a processor  1140  and memory  1130  coupled to the processor  1140 , the processor  1140  and memory  1130  configured to perform various functions described herein. 
     The inter-station communications manager  1145  may manage communications with other base stations  105 , and may include a controller or scheduler for controlling communications with UEs  115  in cooperation with other base stations  105 . For example, the inter-station communications manager  1145  may coordinate scheduling for transmissions to UEs  115  for various interference mitigation techniques such as beamforming or joint transmission. In some examples, the inter-station communications manager  1145  may provide an X2 interface within an LTE/LTE-A wireless communications network technology to provide communication between base stations  105 . 
     The communications manager  1120  may support wireless communication at a base station in accordance with examples as disclosed herein. For example, the communications manager  1120  may be configured as or otherwise support a means for receiving, from a UE, an indication of packet expiration information associated with a set of multiple data packets generated by the UE, where the packet expiration information is based on a set of multiple packet expiration times associated with the set of multiple data packets. The communications manager  1120  may be configured as or otherwise support a means for transmitting, to the UE, scheduling information associated with at least a subset of the set of multiple data packets, where the scheduling information is based on the packet expiration information. The communications manager  1120  may be configured as or otherwise support a means for receiving at least one data packet of the subset of the set of multiple data packets from the UE in accordance with the scheduling information. 
     By including or configuring the communications manager  1120  in accordance with examples as described herein, the device  1105  may support techniques which enable wireless communications systems to support DAS. In particular, by enabling the UEs  115  to indicate packet expiration information (e.g., packet deadline information) to the base station  105 - b , techniques described herein may enable the base station  105 - b  to take the packet expiration information for each respective UE  115  into account when scheduling wireless communications at the respective UEs  115 , which may reduce a quantity and/or frequency of dropped packets at the respective UEs  115 . Moreover, by reducing a quantity and frequency of dropped packets, techniques described herein may reduce a latency of wireless communications, and may lead to more efficient scheduling and a more efficient use of wireless resources. 
     In some examples, the communications manager  1120  may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the transceiver  1115 , the one or more antennas  1125 , or any combination thereof. Although the communications manager  1120  is illustrated as a separate component, in some examples, one or more functions described herein with reference to the communications manager  1120  may be supported by or performed by the processor  1140 , the memory  1130 , the code  1135 , or any combination thereof. For example, the code  1135  may include instructions executable by the processor  1140  to cause the device  1105  to perform various aspects of techniques for DAS as described herein, or the processor  1140  and the memory  1130  may be otherwise configured to perform or support such operations. 
       FIG.  12    shows a flowchart illustrating a method  1200  that supports techniques for DAS in accordance with aspects of the present disclosure. The operations of the method  1200  may be implemented by a UE or its components as described herein. For example, the operations of the method  1200  may be performed by a UE  115  as described herein with reference to  FIGS.  1  through  7   . In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may perform aspects of the described functions using special-purpose hardware. 
     At  1205 , the method may include generating a plurality of data packets that are to be transmitted to a base station, where each data packet of the plurality of data packets is associated with a respective packet expiration time. The operations of  1205  may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of  1205  may be performed by a data packet generating manager  625  as described herein with reference to  FIG.  6   . 
     At  1210 , the method may include transmitting, to the base station, an indication of packet expiration information associated with the plurality of data packets, where the packet expiration information is based at least in part on a plurality of packet expiration times associated with the plurality of data packets. The operations of  1210  may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of  1210  may be performed by a packet expiration information manager  630  as described herein with reference to  FIG.  6   . 
     At  1215 , the method may include receiving, from the base station, scheduling information associated with at least a subset of the plurality of data packets, where the scheduling information is based at least in part on the packet expiration information. The operations of  1215  may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of  1215  may be performed by a scheduling information receiving manager  635  as described herein with reference to  FIG.  6   . 
     At  1220 , the method may include transmitting at least one data packet of the subset of the plurality of data packets to the base station in accordance with the scheduling information. The operations of  1220  may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of  1220  may be performed by a data packet transmitting manager  640  as described herein with reference to  FIG.  6   . 
       FIG.  13    shows a flowchart illustrating a method  1300  that supports techniques for DAS in accordance with aspects of the present disclosure. The operations of the method  1300  may be implemented by a UE or its components as described herein. For example, the operations of the method  1300  may be performed by a UE  115  as described herein with reference to  FIGS.  1  through  7   . In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may perform aspects of the described functions using special-purpose hardware. 
     At  1305 , the method may include receiving, from the base station, control signaling including an indication of a periodicity associated with a plurality of transmission occasions for communicating the packet expiration information. The operations of  1305  may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of  1305  may be performed by a control signaling receiving manager  645  as described herein with reference to  FIG.  6   . 
     At  1310 , the method may include generating a plurality of data packets that are to be transmitted to a base station, where each data packet of the plurality of data packets is associated with a respective packet expiration time. The operations of  1310  may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of  1310  may be performed by a data packet generating manager  625  as described herein with reference to  FIG.  6   . 
     At  1315 , the method may include transmitting, to the base station, an indication of packet expiration information associated with the plurality of data packets, where the packet expiration information is based at least in part on a plurality of packet expiration times associated with the plurality of data packets, where the indication of the packet expiration information is transmitted in accordance with the indicated periodicity and within a transmission occasion of the plurality of transmission occasions. The operations of  1315  may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of  1315  may be performed by a packet expiration information manager  630  as described herein with reference to  FIG.  6   . 
     At  1320 , the method may include receiving, from the base station, scheduling information associated with at least a subset of the plurality of data packets, where the scheduling information is based at least in part on the packet expiration information. The operations of  1320  may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of  1320  may be performed by a scheduling information receiving manager  635  as described herein with reference to  FIG.  6   . 
     At  1325 , the method may include transmitting at least one data packet of the subset of the plurality of data packets to the base station in accordance with the scheduling information. The operations of  1325  may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of  1325  may be performed by a data packet transmitting manager  640  as described herein with reference to  FIG.  6   . 
       FIG.  14    shows a flowchart illustrating a method  1400  that supports techniques for DAS in accordance with aspects of the present disclosure. The operations of the method  1400  may be implemented by a UE or its components as described herein. For example, the operations of the method  1400  may be performed by a UE  115  as described herein with reference to  FIGS.  1  through  7   . In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may perform aspects of the described functions using special-purpose hardware. 
     At  1405 , the method may include receiving, from the base station, control signaling including an indication of one or more trigger conditions for communicating the packet expiration information. The operations of  1405  may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of  1405  may be performed by a control signaling receiving manager  645  as described herein with reference to  FIG.  6   . 
     At  1410 , the method may include generating a plurality of data packets that are to be transmitted to a base station, where each data packet of the plurality of data packets is associated with a respective packet expiration time. The operations of  1410  may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of  1410  may be performed by a data packet generating manager  625  as described herein with reference to  FIG.  6   . 
     At  1415 , the method may include transmitting, to the base station, an indication of packet expiration information associated with the plurality of data packets, where the packet expiration information is based at least in part on a plurality of packet expiration times associated with the plurality of data packets, where transmitting the indication of the packet expiration information is based at least in part on a satisfaction of the one or more trigger conditions. The operations of  1415  may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of  1415  may be performed by a packet expiration information manager  630  as described herein with reference to  FIG.  6   . 
     At  1420 , the method may include receiving, from the base station, scheduling information associated with at least a subset of the plurality of data packets, where the scheduling information is based at least in part on the packet expiration information. The operations of  1420  may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of  1420  may be performed by a scheduling information receiving manager  635  as described herein with reference to  FIG.  6   . 
     At  1425 , the method may include transmitting at least one data packet of the subset of the plurality of data packets to the base station in accordance with the scheduling information. The operations of  1425  may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of  1425  may be performed by a data packet transmitting manager  640  as described herein with reference to  FIG.  6   . 
       FIG.  15    shows a flowchart illustrating a method  1500  that supports techniques for DAS in accordance with aspects of the present disclosure. The operations of the method  1500  may be implemented by a UE or its components as described herein. For example, the operations of the method  1500  may be performed by a UE  115  as described herein with reference to  FIGS.  1  through  7   . In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may perform aspects of the described functions using special-purpose hardware. 
     At  1505 , the method may include generating a plurality of data packets that are to be transmitted to a base station, where each data packet of the plurality of data packets is associated with a respective packet expiration time. The operations of  1505  may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of  1505  may be performed by a data packet generating manager  625  as described herein with reference to  FIG.  6   . 
     At  1510 , the method may include receiving, from the base station, a request for the packet expiration information. The operations of  1510  may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of  1510  may be performed by a request receiving manager  650  as described herein with reference to  FIG.  6   . 
     At  1515 , the method may include transmitting, to the base station, an indication of packet expiration information associated with the plurality of data packets, where the packet expiration information is based at least in part on a plurality of packet expiration times associated with the plurality of data packets, where the indication of the packet expiration information is transmitted in response to the request. The operations of  1515  may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of  1515  may be performed by a packet expiration information manager  630  as described herein with reference to  FIG.  6   . 
     At  1520 , the method may include receiving, from the base station, scheduling information associated with at least a subset of the plurality of data packets, where the scheduling information is based at least in part on the packet expiration information. The operations of  1520  may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of  1520  may be performed by a scheduling information receiving manager  635  as described herein with reference to  FIG.  6   . 
     At  1525 , the method may include transmitting at least one data packet of the subset of the plurality of data packets to the base station in accordance with the scheduling information. The operations of  1525  may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of  1525  may be performed by a data packet transmitting manager  640  as described herein with reference to  FIG.  6   . 
       FIG.  16    shows a flowchart illustrating a method  1600  that supports techniques for DAS in accordance with aspects of the present disclosure. The operations of the method  1600  may be implemented by a base station or its components as described herein. For example, the operations of the method  1600  may be performed by a base station  105  as described herein with reference to  FIGS.  1  through  3  and  8    through  11 . In some examples, a base station may execute a set of instructions to control the functional elements of the base station to perform the described functions. Additionally or alternatively, the base station may perform aspects of the described functions using special-purpose hardware. 
     At  1605 , the method may include receiving, from a UE, an indication of packet expiration information associated with a plurality of data packets generated by the UE, where the packet expiration information is based at least in part on a plurality of packet expiration times associated with the plurality of data packets. The operations of  1605  may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of  1605  may be performed by a packet expiration information receiving manager  1025  as described herein with reference to  FIG.  10   . 
     At  1610 , the method may include transmitting, to the UE, scheduling information associated with at least a subset of the plurality of data packets, where the scheduling information is based at least in part on the packet expiration information. The operations of  1610  may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of  1610  may be performed by a scheduling information transmitting manager  1030  as described herein with reference to  FIG.  10   . 
     At  1615 , the method may include receiving at least one data packet of the subset of the plurality of data packets from the UE in accordance with the scheduling information. The operations of  1615  may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of  1615  may be performed by a data packet receiving manager  1035  as described herein with reference to  FIG.  10   . 
     The following provides an overview of aspects of the present disclosure: 
     Aspect 1: A method for wireless communication at a UE, comprising: generating a plurality of data packets that are to be transmitted to a base station, wherein each data packet of the plurality of data packets is associated with a respective packet expiration time; transmitting, to the base station, an indication of packet expiration information associated with the plurality of data packets, wherein the packet expiration information is based at least in part on a plurality of packet expiration times associated with the plurality of data packets; receiving, from the base station, scheduling information associated with at least a subset of the plurality of data packets, wherein the scheduling information is based at least in part on the packet expiration information; and transmitting at least one data packet of the subset of the plurality of data packets to the base station in accordance with the scheduling information. 
     Aspect 2: The method of aspect 1, further comprising: receiving, from the base station, control signaling including an indication of a periodicity associated with a plurality of transmission occasions for communicating the packet expiration information, wherein the indication of the packet expiration information is transmitted in accordance with the indicated periodicity and within a transmission occasion of the plurality of transmission occasions. 
     Aspect 3: The method of any of aspects 1 through 2, further comprising: receiving, from the base station, control signaling including an indication of one or more trigger conditions for communicating the packet expiration information, wherein transmitting the indication of the packet expiration information is based at least in part on a satisfaction of the one or more trigger conditions. 
     Aspect 4: The method of aspect 3, wherein the satisfaction of the one or more trigger conditions is based at least in part on a packet expiration time of the plurality of packet expiration times satisfying a duration threshold, a change in the packet expiration information satisfying some change threshold, a QoS requirement at the UE satisfying a threshold quality, a processing capability of the UE satisfying a processing capability threshold, or any combination thereof. 
     Aspect 5: The method of any of aspects 1 through 4, further comprising: receiving, from the base station, a request for the packet expiration information, wherein the indication of the packet expiration information is transmitted in response to the request. 
     Aspect 6: The method of aspect 5, wherein the request is received via a DCI message, a MAC-CE message, or both. 
     Aspect 7: The method of any of aspects 1 through 6, further comprising: determining the packet expiration information in accordance with a packet expiry configuration, the packet expiry configuration comprising one or more mathematical operations for determining the packet expiration information based at least in part on the plurality of packet expiration times. 
     Aspect 8: The method of aspect 7, further comprising: receiving, from the base station, a control message indicating the packet expiry configuration, wherein determining the packet expiration information is based at least in part on receiving the control message. 
     Aspect 9: The method of aspect 8, further comprising: receiving, from the base station, additional control signaling indicating a plurality of packet expiry configurations including the packet expiry configuration, wherein the control message is received based at least in part on receiving the additional control signaling, and wherein determining the packet expiration information is based at least in part on receiving the additional control signaling. 
     Aspect 10: The method of any of aspects 7 through 9, wherein determining the packet expiration information in accordance with the packet expiry configuration comprises: determining an average of the plurality of packet expiration times, a median of the plurality of packet expiration times, a minimum of the plurality of packet expiration times, a maximum of the plurality of packet expiration times, or any combination thereof. 
     Aspect 11: The method of any of aspects 1 through 10, wherein transmitting the at least one data packet of the plurality of data packets comprises: identifying that a first data packet of the plurality of data packets is valid based at least in part on the scheduling information and a first packet expiration time corresponding to the first data packet; and transmitting the first data packet based at least in part on identifying that the first data packet is valid, wherein the at least one transmitted data packet includes the first data packet. 
     Aspect 12: The method of aspect 11, further comprising: identifying that a second data packet of the plurality of data packets is expired based at least in part on the scheduling information and a second packet expiration time corresponding to the second data packet; and refraining from transmitting the second data packet based at least in part on identifying that the second data packet is expired. 
     Aspect 13: The method of aspect 12, further comprising: discarding the second data packet from a transmission buffer at the UE based at least in part on identifying that the second data packet is expired, wherein refraining from transmitting the second data packet is based at least in part on discarding the second data packet. 
     Aspect 14: The method of any of aspects 1 through 13, wherein the indication of the packet expiration information is transmitted via a UCI message, a MAC-CE message, or both. 
     Aspect 15: A method for wireless communication at a base station, comprising: receiving, from a UE, an indication of packet expiration information associated with a plurality of data packets generated by the UE, wherein the packet expiration information is based at least in part on a plurality of packet expiration times associated with the plurality of data packets; transmitting, to the UE, scheduling information associated with at least a subset of the plurality of data packets, wherein the scheduling information is based at least in part on the packet expiration information; and receiving at least one data packet of the subset of the plurality of data packets from the UE in accordance with the scheduling information. 
     Aspect 16: The method of aspect 15, further comprising: determining a DAS metric associated with the UE based at least in part on the packet expiration information, an instantaneous achievable data rate at the UE, an average throughput at the UE, or any combination thereof, wherein transmitting the scheduling information is based at least in part on the DAS metric. 
     Aspect 17: The method of aspect 16, further comprising: receiving feedback information from the UE, wherein the instantaneous achievable data rate, the average throughput, or both, are based at least in part on the feedback information. 
     Aspect 18: The method of any of aspects 15 through 17, wherein receiving the indication of the packet expiration information comprises: receiving an indication of packet expiration information associated with a plurality of UEs including the UE; determining a plurality of DAS metrics associated with the plurality of UEs based at least in part on received packet expiration information corresponding to each UE of the plurality of UEs, wherein transmitting the scheduling information is based at least in part on the plurality of DAS metrics. 
     Aspect 19: The method of any of aspects 15 through 18, further comprising: transmitting, to the UE, control signaling including an indication of a periodicity associated with a plurality of transmission occasions for communicating the packet expiration information, wherein the indication of the packet expiration information is received in accordance with the indicated periodicity and within a transmission occasion of the plurality of transmission occasions. 
     Aspect 20: The method of any of aspects 15 through 19, further comprising: transmitting, to the UE, control signaling including an indication of one or more trigger conditions for communicating the packet expiration information, wherein receiving the indication of the packet expiration information is based at least in part on a satisfaction of the one or more trigger conditions. 
     Aspect 21: The method of aspect 20, wherein the satisfaction of the one or more trigger conditions is based at least in part on a packet expiration time of the plurality of packet expiration times satisfying a duration threshold, a change in the packet expiration information satisfying some change threshold, a QoS requirement at the UE satisfying a threshold quality, a processing capability of the UE satisfying a processing capability threshold, or any combination thereof. 
     Aspect 22: The method of any of aspects 15 through 21, further comprising: transmitting, to the UE, a request for the packet expiration information, wherein the indication of the packet expiration information is received in response to the request. 
     Aspect 23: The method of aspect 22, wherein the request is transmitted via a DCI message, a MAC-CE message, or both. 
     Aspect 24: The method of any of aspects 15 through 23, further comprising: transmitting, to the UE, a control message indicating a packet expiry configuration, wherein the packet expiration information is determined in accordance with the packet expiry configuration, the packet expiry configuration comprising one or more mathematical operations for determining the packet expiration information based at least in part on the plurality of packet expiration times. 
     Aspect 25: The method of aspect 24, further comprising: transmitting, to the UE, additional control signaling indicating a plurality of packet expiry configurations including the packet expiry configuration, wherein the control message is transmitted based at least in part on transmitting the additional control signaling. 
     Aspect 26: The method of any of aspects 15 through 25, wherein the indication of the packet expiration information is received via a UCI message, a MAC-CE message, or both. 
     Aspect 27: An apparatus for wireless communication at a UE, comprising a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method of any of aspects 1 through 14. 
     Aspect 28: An apparatus for wireless communication at a UE, comprising at least one means for performing a method of any of aspects 1 through 14. 
     Aspect 29: A non-transitory computer-readable medium storing code for wireless communication at a UE, the code comprising instructions executable by a processor to perform a method of any of aspects 1 through 14. 
     Aspect 30: An apparatus for wireless communication at a base station, comprising a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method of any of aspects 15 through 26. 
     Aspect 31: An apparatus for wireless communication at a base station, comprising at least one means for performing a method of any of aspects 15 through 26. 
     Aspect 32: A non-transitory computer-readable medium storing code for wireless communication at a base station, the code comprising instructions executable by a processor to perform a method of any of aspects 15 through 26. 
     It should be noted that the methods described herein describe possible implementations, and that the operations and the steps may be rearranged or otherwise modified and that other implementations are possible. Further, aspects from two or more of the methods may be combined. 
     Although aspects of an LTE, LTE-A, LTE-A Pro, or NR system may be described for purposes of example, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques may be applicable to various other wireless communications systems such as Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, as well as other systems and radio technologies not explicitly mentioned herein. 
     Information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof. 
     The various illustrative blocks and components described in connection with the disclosure herein may be implemented or performed with a general-purpose processor, a DSP, an ASIC, a CPU, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration). 
     The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations. 
     Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer. By way of example, and not limitation, non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of computer-readable medium. Disk and disc, as used herein, include CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media. 
     As used herein, including in the claims, “or” as used in a list of items (e.g., a list of items prefaced by a phrase such as “at least one of” or “one or more of”) indicates an inclusive list such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Also, as used herein, the phrase “based on” shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on.” 
     The term “determine” or “determining” encompasses a wide variety of actions and, therefore, “determining” can include calculating, computing, processing, deriving, investigating, looking up (such as via looking up in a table, a database or another data structure), ascertaining and the like. Also, “determining” can include receiving (such as receiving information), accessing (such as accessing data in a memory) and the like. Also, “determining” can include resolving, selecting, choosing, establishing and other such similar actions. 
     In the appended figures, similar components or features may have the same reference label. Further, various components of the same type may be distinguished by following the reference label by a dash and a second label that distinguishes among the similar components. If just the first reference label is used in the specification, the description is applicable to any one of the similar components having the same first reference label irrespective of the second reference label, or other subsequent reference label. 
     The description set forth herein, in connection with the appended drawings, describes example configurations and does not represent all the examples that may be implemented or that are within the scope of the claims. The term “example” used herein means “serving as an example, instance, or illustration,” and not “preferred” or “advantageous over other examples.” The detailed description includes specific details for the purpose of providing an understanding of the described techniques. These techniques, however, may be practiced without these specific details. In some instances, known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described examples. 
     The description herein is provided to enable a person having ordinary skill in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to a person having ordinary skill in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not limited to the examples and designs described herein but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.