Patent Publication Number: US-11653384-B2

Title: Techniques for indicating coverage enhancement for random access procedures in wireless communications systems

Description:
FIELD OF DISCLOSURE 
     The following relates, for example, to wireless communication, including techniques for indicating coverage enhancement for random access procedures in wireless communications systems. 
     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). 
     Some wireless communications systems may support devices performing random access procedures to establish connections. It may be beneficial to provide techniques for coverage enhancement for random access procedures. 
     SUMMARY 
     The described techniques relate to improved methods, systems, devices, and apparatuses that support techniques for indicating coverage enhancement for random access procedures in wireless communications systems. Generally, the described techniques provide for a base station to determine whether to perform coverage enhancement for a random access procedure and to transmit an indication to a user equipment (UE) accordingly. For example, a base station may transmit an indication of whether coverage enhancement is associated with a second random access message (e.g., a random access Message 4 (Msg4)) using a first random access message (e.g., a random access Message 2 (Msg2)). In some implementations, the base station may also transmit an indication of a type of coverage enhancement associated with the second random access message using the first random access message. The base station may transmit, and the UE receive, the second random access message accordingly. Implementing aspects of the present disclosure may enable coverage enhancement for random access procedures in wireless communications systems. 
     A method for wireless communication at a user equipment (UE) is described. The method may include receiving, from a base station, a first random access message including an indication as to whether a coverage enhancement is associated with a second random access message, the indication based on a condition of a channel used to receive the second random access message from the base station failing to satisfy a threshold and receiving, from the base station, the second random access message based on receiving the indication. 
     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 receive, from a base station, a first random access message including an indication as to whether a coverage enhancement is associated with a second random access message, the indication based on a condition of a channel used to receive the second random access message from the base station failing to satisfy a threshold and receive, from the base station, the second random access message based on receiving the indication. 
     Another apparatus for wireless communication at a UE is described. The apparatus may include means for receiving, from a base station, a first random access message including an indication as to whether a coverage enhancement is associated with a second random access message, the indication based on a condition of a channel used to receive the second random access message from the base station failing to satisfy a threshold and means for receiving, from the base station, the second random access message based on receiving the indication. 
     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 receive, from a base station, a first random access message including an indication as to whether a coverage enhancement is associated with a second random access message, the indication based on a condition of a channel used to receive the second random access message from the base station failing to satisfy a threshold and receive, from the base station, the second random access message based on receiving the indication. 
     In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving the first random access message may include operations, features, means, or instructions for receiving an indication of whether the coverage enhancement may be associated with the second random access message in a physical downlink shared channel payload associated with the first random access message. 
     In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving the first random access message may include operations, features, means, or instructions for receiving an indication of whether the coverage enhancement may be associated with the second random access message in downlink control information associated with the first random access message. 
     In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving the first random access message may include operations, features, means, or instructions for receiving the first random access message using a temporary cell radio network temporary identifier, where the first random access message implicitly indicates whether the coverage enhancement may be associated with the second random access message based on the temporary cell radio network temporary identifier. 
     In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving the first random access message may include operations, features, means, or instructions for receiving an indication including one bit configured for indicating whether the coverage enhancement may be associated with a physical downlink control channel payload and a physical downlink shared channel payload associated with the second random access message, where the first random access message includes the indication. 
     In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving the first random access message may include operations, features, means, or instructions for receiving an indication including at least two bits configured for independently indicating whether the coverage enhancement may be associated with a physical downlink control channel payload or a physical downlink shared channel payload or both associated with the second random access message, where the first random access message includes the indication. 
     In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving the first random access message may include operations, features, means, or instructions for receiving an indication of a type of the coverage enhancement in a physical downlink shared channel payload associated with the first random access message, where the first random access message includes the indication. 
     In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving the first random access message may include operations, features, means, or instructions for receiving an indication of a type of the coverage enhancement in a downlink control information payload associated with the first random access message, where the first random access message includes the indication. 
     In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving the first random access message may include operations, features, means, or instructions for receiving a downlink control information payload associated with the first random access message, where the first random access message implicitly indicates a type of the coverage enhancement associated with the second random access message based on a location of the downlink control information payload in the first random access message. 
     In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving the first random access message may include operations, features, means, or instructions for receiving the first random access message using a temporary cell radio network temporary identifier, where the first random access message implicitly indicates a type of the coverage enhancement associated with the second random access message based on the temporary cell radio network temporary identifier. 
     A method for wireless communication at a base station is described. The method may include transmitting, to a UE, a first random access message including an indication as to whether a coverage enhancement is associated with a second random access message, the indication based on a condition of a channel used to transmit the second random access message from the base station to the UE failing to satisfy a threshold and transmitting, to the UE, the second random access message based on transmitting the indication. 
     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 transmit, to a UE, a first random access message including an indication as to whether a coverage enhancement is associated with a second random access message, the indication based on a condition of a channel used to transmit the second random access message from the base station to the UE failing to satisfy a threshold and transmit, to the UE, the second random access message based on transmitting the indication. 
     Another apparatus for wireless communication at a base station is described. The apparatus may include means for transmitting, to a UE, a first random access message including an indication as to whether a coverage enhancement is associated with a second random access message, the indication based on a condition of a channel used to transmit the second random access message from the base station to the UE failing to satisfy a threshold and means for transmitting, to the UE, the second random access message based on transmitting the indication. 
     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 transmit, to a UE, a first random access message including an indication as to whether a coverage enhancement is associated with a second random access message, the indication based on a condition of a channel used to transmit the second random access message from the base station to the UE failing to satisfy a threshold and transmit, to the UE, the second random access message based on transmitting the indication. 
     In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the first random access message may include operations, features, means, or instructions for transmitting an indication of whether the coverage enhancement may be associated with the second random access message in a physical downlink shared channel payload associated with the first random access message. 
     In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the first random access message may include operations, features, means, or instructions for transmitting an indication of whether the coverage enhancement may be associated with the second random access message in downlink control information associated with the first random access message. 
     In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the first random access message may include operations, features, means, or instructions for transmitting the first random access message using a temporary cell radio network temporary identifier, where the first random access message implicitly indicates whether the coverage enhancement may be associated with the second random access message based on the temporary cell radio network temporary identifier. 
     In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the first random access message may include operations, features, means, or instructions for transmitting an indication including one bit configured for indicating whether the coverage enhancement may be associated with a physical downlink control channel payload and a physical downlink shared channel payload associated with the second random access message, where the first random access message includes the indication. 
     In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the first random access message may include operations, features, means, or instructions for transmitting an indication including at least two bits configured for independently indicating whether the coverage enhancement may be associated with a physical downlink control channel payload or a physical downlink shared channel payload or both associated with the second random access message, where the first random access message includes the indication. 
     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 UE, a random access preamble, where transmitting the first random access message may be in response to receiving the random access preamble. 
     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 channel characteristic associated with the channel between the base station and the UE based on receiving the random access preamble, where transmitting the first random access message may be based on the channel characteristic. 
     In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the channel characteristic includes one or more of a reference signal received power or a signal-to-interference-plus-noise-ratio. 
     In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving the random access preamble may include operations, features, means, or instructions for receiving, from the UE, a random access preamble requesting the coverage enhancement associated with the second random access message, where transmitting the first random access message may be based on receiving the first random access message. 
     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 type of the UE based on receiving the random access preamble, where transmitting the first random access message may be based on the type of the UE. 
     Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining to perform the coverage enhancement associated with the second random access message, where transmitting the first random access message may be based on the determining and transmitting the second random access message according to the coverage enhancement. 
     Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining that the base station may be configured to use a first type of coverage enhancement associated with the second random access message, where transmitting the second random access message may be based on the determining. 
     In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the first random access message may include operations, features, means, or instructions for transmitting an indication of a type of the coverage enhancement in a physical downlink shared channel payload associated with the first random access message, where the first random access message includes the indication. 
     In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the first random access message may include operations, features, means, or instructions for transmitting an indication of a type of the coverage enhancement in a downlink control information payload associated with the first random access message, where the first random access message includes the indication. 
     In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the first random access message may include operations, features, means, or instructions for transmitting a downlink control information payload associated with the first random access message, where the first random access message implicitly indicates a type of the coverage enhancement associated with the second random access message based on a location of the downlink control information payload in the first random access message. 
     In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the first random access message may include operations, features, means, or instructions for transmitting the first random access message using a temporary cell radio network temporary identifier, where the first random access message implicitly indicates a type of the coverage enhancement associated with the second random access message based on the temporary cell radio network temporary identifier. 
     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 first type of the coverage enhancement associated with the second random access message, where transmitting the first random access message includes transmitting an indication of the first type, receiving, from the UE, a third random access message based on transmitting the first random access message, and determining a second type of the coverage enhancement associated with the second random access message based on transmitting the first random access message and receiving the fifth random access message, where transmitting the second random access message may be based on determining the second type. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    illustrates an example of a wireless communications system that supports techniques for indicating coverage enhancement for random access procedures in wireless communications systems in accordance with aspects of the present disclosure. 
         FIG.  2    illustrates an example of a wireless communications system that supports techniques for indicating coverage enhancement for random access procedures in wireless communications systems in accordance with aspects of the present disclosure. 
         FIG.  3    illustrates an example of a process flow in a system that supports techniques for indicating coverage enhancement for random access procedures in wireless communications systems in accordance with aspects of the present disclosure. 
         FIGS.  4  and  5    show block diagrams of devices that support techniques for indicating coverage enhancement for random access procedures in wireless communications systems in accordance with aspects of the present disclosure. 
         FIG.  6    shows a block diagram of a communications manager that supports techniques for indicating coverage enhancement for random access procedures in wireless communications systems in accordance with aspects of the present disclosure. 
         FIG.  7    shows a diagram of a system including a device that supports techniques for indicating coverage enhancement for random access procedures in wireless communications systems in accordance with aspects of the present disclosure. 
         FIGS.  8  and  9    show block diagrams of devices that support techniques for indicating coverage enhancement for random access procedures in wireless communications systems in accordance with aspects of the present disclosure. 
         FIG.  10    shows a block diagram of a communications manager that supports techniques for indicating coverage enhancement for random access procedures in wireless communications systems in accordance with aspects of the present disclosure. 
         FIG.  11    shows a diagram of a system including a device that supports techniques for indicating coverage enhancement for random access procedures in wireless communications systems in accordance with aspects of the present disclosure. 
         FIGS.  12  through  17    show flowcharts illustrating methods that support techniques for indicating coverage enhancement for random access procedures in wireless communications systems in accordance with aspects of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Some wireless communications systems, such as fifth generation (5G) New Radio (NR) systems may support random access procedures for establishing connections between devices. For example, a user equipment (UE) may initiate a random access procedure with a base station to transition from an inactive state to a connected state such that the UE and the base station may share information via a communication link. Additionally or alternatively, devices may use random access procedures to perform handover procedures between cells in wireless communications systems, to perform link or beam recovery procedures, or to request uplink resource scheduling. 
     Some random access procedures, such as contention-based random access procedures, may include four steps with associated signaling. For example, a UE may transmit a random access preamble to a base station and receive, in response, a first random access message (e.g., a random access response message or a random access Message 2 (Msg2)) including timing information to align a transmission timing of uplink messages to a timing associated with the base station. If multiple UEs transmit random access preambles simultaneously, resulting in a collision, the base station and the UE may use additional signaling (e.g., steps three and four) to resolve the collision. For example, the UE may transmit a third random access message (e.g., a random access Message 3 (Msg3)) using resources indicated in the first random access message. In response, the base station may transmit a second random access message (e.g., a random access Message 4 (Msg4)) to resolve any collisions and to indicate the UE to transition to a connected state. In some cases, however, conditions associated with a channel between the UE and a base station may be unfavorable, which may lead to inefficient or inaccurate random access procedures. In such cases, devices may perform coverage enhancement (e.g., transmission repetition, beam refinement, etc.) to mitigate the effects of unfavorable channel conditions. It may be beneficial to implement a method whereby a base station may indicate coverage enhancement for random access procedures in wireless communications systems. 
     One such method may include a base station indicating whether coverage enhancement is associated with the second random access message using the first random access message (e.g., a random access response or random access Message 2 (Msg2)). In some examples, the base station may transmit the indication of coverage enhancement in a physical downlink shared channel (PDSCH) or downlink control information (DCI) included in the first random access message. In some examples, the base station may transmit the first random access message using temporary cell radio network temporary identifier (TC-RNTI) which implicitly indicates the coverage enhancement. For example, the base station may transmit the first random access message using an odd TC-RNTI or an even TC-RNTI to indicate whether or not coverage enhancement is associated with the second random access message. In some examples, the base station may jointly indicate (e.g., using one bit) coverage enhancement for a PDSCH and a physical downlink control channel (PDCCH) for the second random access message. In some examples, the base station may independently indicate (e.g., using at least two bits) coverage enhancement for the PDSCH, the PDCCH, or both for the second random access message. 
     In some examples, the base station may determine to indicate coverage enhancement based on conditions of a channel between the base station and the UE. For example, the base station may determine that a channel characteristic associated with the channel between the base station and the UE does not satisfy a threshold and may indicate coverage enhancement accordingly. In some examples, the base station may determine to indicate coverage enhancement based on receiving a request for coverage enhancement from the UE (e.g., via third random access message). Additionally or alternatively, the base station may determine a type of the UE (e.g., may determine that the UE is a reduced capability UE) based on receiving a random access preamble from the UE and may determine to perform coverage enhancement accordingly. In some implementations, the base station may receive the random access preamble from the UE and may determine that a resource allocation (e.g., a bandwidth part (BWP) allocation) for the random access procedure may be insufficient to enable reliable delivery of the second random access message. Accordingly, the base station may determine to perform coverage enhancement which may lead to an increased reliability of communication for the second random access message. 
     Additionally or alternatively, the base station may indicate a type of the coverage enhancement which may be associated with the second random access message. For example, the base station may transmit an indication (e.g., as a field or parameter) of a type of coverage enhancement in a PDSCH or DCI of the first random access message. In some examples, the base station may transmit DCI in the first random access message such that a location of the DCI in the first random access message implicitly indicates the type of coverage enhancement procedure. In some implementations, the base station may transmit the first random access message using a TC-RNTI which implicitly indicates the type of coverage enhancement. For example, the base station may use a TC-RNTI divisible by five to indicate no coverage enhancement, or a TC-RNTI with a remainder (e.g., one, two, three, or four) to indicate a type of coverage enhancement associated with the second random access message. In some examples, the base station or the UE may be configured with a type of coverage enhancement. In some examples, the base station may indicate a first type of coverage enhancement using the first random access procedure and then may determine to use a second type of coverage enhancement procedure based on receiving the third random access message (e.g., a random access Message 3 (Msg3)) from the UE. Accordingly, the base station may transmit the second random access message to the UE. Implementing aspects of the present disclosure may enable coverage enhancement for random access procedures which may lead to an increased efficiency or accuracy of communication. 
     Aspects of the disclosure are initially described in the context of wireless communications systems. Aspects of the disclosure are further described with respect to a process flow in a wireless communications system. Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flowcharts that relate to techniques for indicating coverage enhancement for random access procedures in wireless communications systems. 
       FIG.  1    illustrates an example of a wireless communications system  100  that supports techniques for indicating coverage enhancement for random access procedures in wireless communications systems 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 (e.g., mission critical) 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 coverage area  110  over which the UEs  115  and the base station  105  may establish one or more communication links  125 . The 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 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 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. 
     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 include 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 (Δf) 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 . 
     Each base station  105  may provide communication coverage via one or more cells, for example a macro cell, a small cell, a hot spot, or other types of cells, or any combination thereof. The term “cell” may refer to a logical communication entity used for communication with a base station  105  (e.g., over a carrier) and may be associated with an identifier for distinguishing neighboring cells (e.g., a physical cell identifier (PCID), a virtual cell identifier (VCID), or others). In some examples, a cell may also refer to a geographic coverage area  110  or a portion of a geographic coverage area  110  (e.g., a sector) over which the logical communication entity operates. Such cells may range from smaller areas (e.g., a structure, a subset of structure) to larger areas depending on various factors such as the capabilities of the base station  105 . For example, a cell may be or include a building, a subset of a building, or exterior spaces between or overlapping with geographic coverage areas  110 , among other examples. 
     A macro cell covers, for example, a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by the UEs  115  with service subscriptions with the network provider supporting the macro cell. A small cell may be associated with a lower-powered base station  105 , as compared with a macro cell, and a small cell may operate in the same or different (e.g., licensed, unlicensed) frequency bands as macro cells. Small cells may provide unrestricted access to the UEs  115  with service subscriptions with the network provider or may provide restricted access to the UEs  115  having an association with the small cell (e.g., the UEs  115  in a closed subscriber group (CSG), the UEs  115  associated with users in a home or office). A base station  105  may support one or multiple cells and may also support communications over the one or more cells using one or multiple component carriers. 
     In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., MTC, narrowband IoT (NB-IoT), enhanced mobile broadband (eMBB)) that may provide access for different types of devices. 
     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 support synchronous or asynchronous operation. For synchronous operation, the base stations  105  may have similar frame timings, and transmissions from different base stations  105  may be approximately aligned in time. For asynchronous operation, the base stations  105  may have different frame timings, and transmissions from different base stations  105  may, in some examples, not be aligned in time. The techniques described herein may be used for either synchronous or asynchronous operations. 
     Some UEs  115  may be configured to employ operating modes that reduce power consumption, such as half-duplex communications (e.g., a mode that supports one-way communication via transmission or reception, but not transmission and reception simultaneously). In some examples, half-duplex communications may be performed at a reduced peak rate. Other power conservation techniques for the UEs  115  include entering a power saving deep sleep mode when not engaging in active communications, operating over a limited bandwidth (e.g., according to narrowband communications), or a combination of these techniques. For example, some UEs  115  may be configured for operation using a narrowband protocol type that is associated with a defined portion or range (e.g., set of subcarriers or resource blocks (RBs)) within a carrier, within a guard-band of a carrier, or outside of a carrier. 
     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) or mission critical communications. The UEs  115  may be designed to support ultra-reliable, low-latency, or critical functions (e.g., mission critical functions). Ultra-reliable communications may include private communication or group communication and may be supported by one or more mission critical services such as mission critical push-to-talk (MCPTT), mission critical video (MCVideo), or mission critical data (MCData). Support for mission critical functions may include prioritization of services, and mission critical services may be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, mission critical, 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, for example in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). 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. 
     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 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 an 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 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 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 Radio Resource Control (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 examples, the wireless communications system  100  may support a UE  115  performing a random access procedure to establish a connection with a base station  105 . For example, a UE  115  and a base station  105  may perform a random access procedure to synchronize the UE  115  to a different cell, to re-establish synchronization in a service cell of the UE  115 , to request uplink scheduling, or to obtain a downlink beam as part of a beam recovery procedure. 
     Some random access procedures may use four steps to establish a connection, perform synchronization, and resolve collisions. One such random access procedure may include a UE  115  transmitting a random access preamble based on a synchronization signal block (SSB) broadcasted by a base station  105 . The UE  115  may determine time or frequency locations of a random access channel (RACH) via a mapping based on an index of the SSB. In some examples, random access transmissions may be configured to occur within a configurable set of slots (e.g., RACH slots) that repeat periodically. In each slot, there may be multiple frequency domain occasions (e.g., RACH occasions) which jointly cover a set of resource blocks based on a bandwidth associated with a random access preamble. For example, each RACH slot may include up to eight RACH occasions. The UE  115  may select a RACH occasion based on the index of the SSB. In some implementations, the SSB may indicate a RACH occasion in a frequency domain, in a time domain within a slot, and in a time domain between slots. If multiple occasions are associated with an SSB, the UE  115  may select an occasion having a uniform probability. 
     In some examples, the UE  115  may select a random access preamble to transmit from a set of up to 64 configured random access preambles. Each random access preamble may be configured with a periodicity (e.g., from 10 ms to 160 ms), a set of slots within a period, and a frequency domain resource indicated using a resource block index or a number of contiguous frequency domain occasions. In some implementations, the random access preamble may include a Zadoff-Chu sequence having a length equal to a prime integer. A random access preamble including 139 values of the Zadoff-Chu sequence may be referred to as a short preamble. Similarly, a random access preamble including 839 values of the Zadoff-Chu sequence may be referred to as a long preamble. A Zadoff-Chu sequence of length L may be used to generate different preamble sequences using up to L−1 different root indices. In some implementations, different UEs  115  may transmit cyclic-shifted preambles, a number of which may be based on a cell-level parameter (e.g., a zero-correlation-zone parameter provided in a system information block (SIB)) such that cyclic-shifts are larger than a largest delay in the cell. In some implementations, a random access preamble may be precoded using a discrete Fourier transform (DFT) prior to modulation. An output of an OFDM modulator may include a number of repetitions of the random access preamble with a cyclic prefix added once per repetition. In some implementations, a short random access preamble may support a subcarrier spacing of 60 kHz or 120 kHz and may occupy  12  resource blocks in a frequency domain. In some examples, the UE  115  may use a same beam for receiving the SSB and for transmitting the random access preamble. If the UE  115  does not receive a response to the random access preamble, the UE  115  may increase a transmission power associated with the random access preamble and re-transmit the random access preamble to the base station  105 . 
     In response to receiving the random access preamble, the base station  105  may transmit a first random access message (e.g., a random access response message or a random access Message 2 (Msg2). The random access response message may include information associated with the received random access preamble, timing correction information, a temporary identifier or TC-RNTI, and a scheduling grant for the UE  115  to use for transmitting a subsequent a third random access message (e.g., a Msg3) if a collision occurs (e.g., if multiple UEs  115  transmit a same random access preamble using a same set of resources). 
     Accordingly, the UE  115  may transmit the third random access message to the base station  105 . In some implementations, the third random access message may include a device identifier (e.g., a cell radio network temporary identifier (C-RNTI) or a core network device identifier), a radio resource control (RRC) message indicating a state of the UE  115 , and a buffer status request (BSR) MAC control element (CE) if there is data for the UE  115  to transmit to the base station  105 . In some examples, the UE  115  may transmit the third random access message using resources and the TC-RNTI indicated in the random access response message. 
     In response to receiving the third random access message, the base station  105  may transmit a second random access message (e.g., a Msg4) to the UE  115  indicating the UE  115  to transition to a connected state. In some examples, the UE  115  may transmit HARQ acknowledgement indication if the UE  115  successfully receives the second random access message or may restart the random access procedure if the UE  115  fails to receive the second random access message. In some examples, the random access procedure may be hindered due to poor conditions associated with a channel between the UE  115  and the base station  105 . In such examples, the UE  115  and the base station  105  may use coverage enhancement for the random access procedure. 
     The base station  105  may determine (e.g., based on receiving the random access preamble) to perform coverage enhancement for the random access procedure. Accordingly, the base station  105  may transmit an indication of coverage enhancement to the UE  115 . For example, the base station  105  may transmit an indication of whether coverage enhancement is associated with a second random access message (e.g., a Msg4) using a first random access message (e.g., a Msg2). In some examples, the base station  105  may transmit the indication (e.g., as a field or parameter) in a PDSCH or a DCI of the first random access message. In some implementations, the base station  105  may transmit the first random access message using a TC-RNTI which implicitly indicates the coverage enhancement. The base station  105  may jointly indicate (e.g., using one bit) or independent indicate (e.g., using at least two bits) whether coverage enhancement is associated with a PDCCH or a PDSCH of the second random access message. Additionally or alternatively, the base station  105  may indicate a type of the coverage enhancement to the UE  115 . In some examples, the base station  105  may indicate a first type of coverage enhancement using the first random access message and may determine to perform a second type of coverage enhancement based on receiving a third random access message (e.g., a Msg3) from the UE  115 . The base station  105  may transmit the second random access message based on determining whether to perform coverage enhancement. Implementing aspects of the present disclosure may enable the wireless communication system  100  to perform coverage enhancement for random access procedures which may lead to an increased reliability or an increased efficiency, among other benefits. 
       FIG.  2    illustrates an example of a wireless communications system  200  that supports techniques for indicating coverage enhancement for random access procedures in wireless communication systems, in accordance with one or more aspects of the present disclosure. The wireless communications system  200  may implement aspects of a wireless communications system  100  as described with reference to  FIG.  1   . The wireless communications system  200  may include a UE  215  which may be an example of a UE  115  as described with reference to  FIG.  1   . The wireless communications system  200  may also include a base station  205  as described with reference to  FIG.  1   . The base station  205  may be associated with a cell providing wireless communications system within a coverage area  210 . The UE  215  and the base station  205  may perform a random access procedure using a channel  220 . In some examples, the UE  215  and the base station  105  may use coverage enhancement for the random access procedure if, for example, the channel  220  is experiencing poor channel conditions. 
     The base station  205  may indicate, to the UE  215 , whether coverage enhancement is associated with a second random access message (e.g., a Msg4) using a first random access message  225  (e.g., a random access response or Msg2). For example, the base station  205  may transmit an indication (e.g., as a field or parameter) to the UE  215  included in a PDSCH or a DCI (e.g., a scheduling DCI) of the first random access message  225 . In some implementations, the base station  205  may transmit the first random access message  225  using a TC-RNTI which implicitly indicates whether coverage enhancement is associated with the second random access message. For example, the base station  205  may transmit the first random access message  225  using an odd TC-RNTI or an even TC-RNTI to indicate the coverage enhancement. The base station  205  may jointly (e.g., using one bit) or independently (e.g., using at least two bits) indicate coverage enhancement for a PDCCH and a PDSCH associated with the second random access message. For example, the base station  205  may determine that coverage enhancement is needed for only the PDCCH or the PDSCH and indicate the coverage enhancement independently according to the determination. 
     In some examples, the base station  205  may determine to indicate coverage enhancement based on conditions of the channel  220  between the base station  205  and the UE  215 . For example, the base station  205  may determine that a characteristic (e.g., a reference signal received power (RSRP) or a signal-to-interference-plus-noise ratio (SINR)) of the channel  220  fails to satisfy a threshold and may transmit an indication of coverage enhancement accordingly. In some examples, the base station  205  may receive a request for coverage enhancement from the UE  215  using a third random access message (e.g., a random access Message 1 (Msg1) or random access preamble) and may transmit an indication of coverage enhancement accordingly. Additionally or alternatively, the base station  205  may (e.g., based on the third random access message) that a resource allocation or BWP allocation for the random access procedure is insufficient to enable reliable delivery of the second random access message and may determine to perform coverage enhancement accordingly. In some examples, the base station  205  may determine type of the UE  215  based on receiving a random access preamble from the UE  215 . For example, the base station  205  may determine that the UE  215  has a reduced capability (e.g., a reduced processing capability, a reduced transmission capability, etc.) and may determine to perform coverage enhancement which may to mitigate any effects of the reduced capability of the UE  215 . In some examples, the base station  205  may indicate coverage enhancement using the first random access message  225  and then may determine not to perform coverage enhancement based on receiving a fourth random access message (e.g., a Msg3) from the UE  215 . 
     Additionally or alternatively, the base station  205  may indicate a type of coverage enhancement using the first random access message  225 . For example, the base station  205  may transmit an indication (e.g., a field or parameter having a number of bits) to the UE  215  in a PDSCH or a DCI of the second random access message. In some implementations, the base station  205  may transmit a DCI in the second random access message such that the location of the DCI implicitly indicates a type of coverage enhancement. In some examples, the base station  215  may transmit the first random access message  225  using a TC-RNTI which implicitly indicates the type of coverage enhancement. For example, the base station  205  may use a TC-RNTI that is divisible by five to indicate that no coverage enhancement is associated with the second random access message and may use a TC-RNTI having a remainder (e.g., one, two, three, or four) when divided by five to indicate a type of coverage enhancement. In some examples, the base station  205  may indicate a first type of coverage enhancement using the first random access message  225  and may determine to switch to a second type of coverage enhancement (e.g., based on receiving a third random access message from the UE  215 ) for transmitting the second random access message. Implementing aspects of the present disclosure may enable the wireless communications system  200  to enable coverage enhancement for random access procedures, which may lead to an increased efficiency or accuracy of communication between devices, among other benefits. 
       FIG.  3    illustrates an example of a process flow  300  is a system that supports techniques for requesting coverage enhancement for random access procedures in wireless communications systems in accordance with one or more aspects of the present disclosure. In some examples, the process flow  300  may be implemented in accordance with one or more aspects of a wireless communications system  100  or  200  as described with reference to  FIGS.  1  and  2   . The process flow  300  may include a UE  315  and a base station  305  which may be examples of the corresponding devices described herein. Alternative examples of the following may be implemented in which some processes are performed in a different order than described or are not performed at all. In some examples, the processes may include additional features not mentioned below, or further processes may be added. 
     At  320 , the UE  315  may transmit a random access preamble to the base station  305 , initiating a random access procedure to establish a communication link with the base station  305 . In some examples, the UE  315  may request coverage enhancement for the random access procedure using the random access preamble. 
     At  325 , the base station  305  may determine whether to apply coverage enhancement to a second random access message (e.g., a Msg 4). For example, the base station  305  may determine, based on receiving the random access preamble from the UE  315 , that a resource allocation (e.g., a BWP allocation) for the random access procedure is insufficient to enable reliable delivery of the second random access message and may determine to perform coverage enhancement for the second random access message which may lead to an increased reliability. Additionally or alternatively, the base station  305  may determine a type of the UE  315  using the random access preamble and may determine to perform coverage enhancement accordingly. For example, the base station  305  may determine that the UE  315  has a reduced capability (e.g., a reduced processing capability, a reduced transmission capability, etc.) and may determine to perform coverage enhancement which may mitigate any effects of the reduced capability of the UE  315 . 
     At  330 , in response to receiving the random access preamble, the base station  305  may transmit a first random access message (e.g., a random access response or Msg2). The base station  305  may use the first random access message to indicate whether coverage enhancement is associated with the second random access message (e.g., a Msg4). In some examples, the base station  305  may transmit an indication (e.g., a field or parameter having a number of bits) of coverage enhancement in a PDSCH or a DCI of the second random access message. In some examples, the base station  305  may transmit the first random access message using a TC-RNTI implicitly indicating coverage enhancement. The base station  305  may jointly or independently indicate coverage enhancement for a PDSCH and a PDCCH of the second random access message. Additionally or alternatively, the base station  305  may indicate a type of coverage enhancement associated with the second random access message. 
     At  335 , in response to receiving the first random access message, the UE  315  may transmit a third random access message (e.g., a Msg3). In some examples, the UE  315  may use the third random access message to request coverage enhancement for the second random access message. 
     In some implementations, at  340 , the base station  305  may determine whether to perform coverage enhancement or to a switch to a different type of coverage enhancement for the second random access message based on transmitting the first random access message and receiving the third random access message. For example, the base station  305  may indicate coverage enhancement using the first random access message and the change a type of coverage enhancement or determine to refrain from performing the coverage enhancement based on receiving the third random access message from the UE  315 . Accordingly, at  345 , the base station  305  may transmit the second random access message. Implementing aspects of the process flow  300  may enable a wireless communications system to use coverage enhancement for random access procedures which may lead to an increased efficiency of communication, among other benefits. 
       FIG.  4    shows a block diagram  400  of a device  405  that supports techniques for indicating coverage enhancement for random access procedures in wireless communications systems 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. 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 indicating coverage enhancement for random access procedures in wireless communications systems). 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 indicating coverage enhancement for random access procedures in wireless communications systems). In some examples, the transmitter  415  may be co-located with a receiver  410  in a transceiver component. 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 indicating coverage enhancement for random access procedures in wireless communications systems 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 receiving, from a base station, a first random access message including an indication as to whether a coverage enhancement is associated with a second random access message, the indication based on a condition of a channel used to receive the second random access message from the base station failing to satisfy a threshold. The communications manager  420  may be configured as or otherwise support a means for receiving, from the base station, the second random access message based on receiving the indication. 
     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 for coverage enhancement in wireless communications systems, such that the device  405  may experience a reduced processing, a reduced power consumption, an increased reliability of communications, or a more efficient resource utilization, among other benefits. 
       FIG.  5    shows a block diagram  500  of a device  505  that supports techniques for indicating coverage enhancement for random access procedures in wireless communications systems 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. 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 indicating coverage enhancement for random access procedures in wireless communications systems). 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 indicating coverage enhancement for random access procedures in wireless communications systems). In some examples, the transmitter  515  may be co-located with a receiver  510  in a transceiver component. 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 indicating coverage enhancement for random access procedures in wireless communications systems as described herein. For example, the communications manager  520  may include an indication receiver  525  a message receiver  530 , 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 indication receiver  525  may be configured as or otherwise support a means for receiving, from a base station, a first random access message including an indication as to whether a coverage enhancement is associated with a second random access message, the indication based on a condition of a channel used to receive the second random access message from the base station failing to satisfy a threshold. The message receiver  530  may be configured as or otherwise support a means for receiving, from the base station, the second random access message based on receiving the indication. 
       FIG.  6    shows a block diagram  600  of a communications manager  620  that supports techniques for indicating coverage enhancement for random access procedures in wireless communications systems 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 indicating coverage enhancement for random access procedures in wireless communications systems as described herein. For example, the communications manager  620  may include an indication receiver  625 , a message receiver  630 , a shared channel receiver  635 , a control receiver  640 , an identifier receiver  645 , a joint receiver  650 , an independent receiver  655 , a type shared channel receiver  660 , a type control receiver  665 , a control location receiver  670 , a type identifier receiver  675 , 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 indication receiver  625  may be configured as or otherwise support a means for receiving, from a base station, a first random access message including an indication as to whether a coverage enhancement is associated with a second random access message, the indication based on a condition of a channel used to receive the second random access message from the base station failing to satisfy a threshold. The message receiver  630  may be configured as or otherwise support a means for receiving, from the base station, the second random access message based on receiving the indication. 
     In some examples, to support receiving the first random access message, the shared channel receiver  635  may be configured as or otherwise support a means for receiving an indication of whether the coverage enhancement is associated with the second random access message in a physical downlink shared channel payload associated with the first random access message. 
     In some examples, to support receiving the first random access message, the control receiver  640  may be configured as or otherwise support a means for receiving an indication of whether the coverage enhancement is associated with the second random access message in downlink control information associated with the first random access message. 
     In some examples, to support receiving the first random access message, the identifier receiver  645  may be configured as or otherwise support a means for receiving the first random access message using a temporary cell radio network temporary identifier, where the first random access message implicitly indicates whether the coverage enhancement is associated with the second random access message based on the temporary cell radio network temporary identifier. 
     In some examples, to support receiving the first random access message, the joint receiver  650  may be configured as or otherwise support a means for receiving an indication including one bit configured for indicating whether the coverage enhancement is associated with a physical downlink control channel payload and a physical downlink shared channel payload associated with the second random access message, where the first random access message includes the indication. 
     In some examples, to support receiving the first random access message, the independent receiver  655  may be configured as or otherwise support a means for receiving an indication including at least two bits configured for independently indicating whether the coverage enhancement is associated with a physical downlink control channel payload or a physical downlink shared channel payload or both associated with the second random access message, where the first random access message includes the indication. 
     In some examples, to support receiving the first random access message, the type shared channel receiver  660  may be configured as or otherwise support a means for receiving an indication of a type of the coverage enhancement in a physical downlink shared channel payload associated with the first random access message, where the first random access message includes the indication. 
     In some examples, to support receiving the first random access message, the type control receiver  665  may be configured as or otherwise support a means for receiving an indication of a type of the coverage enhancement in a downlink control information payload associated with the first random access message, where the first random access message includes the indication. 
     In some examples, to support receiving the first random access message, the control location receiver  670  may be configured as or otherwise support a means for receiving a downlink control information payload associated with the first random access message, where the first random access message implicitly indicates a type of the coverage enhancement associated with the second random access message based on a location of the downlink control information payload in the first random access message. 
     In some examples, to support receiving the first random access message, the type identifier receiver  675  may be configured as or otherwise support a means for receiving the first random access message using a temporary cell radio network temporary identifier, where the first random access message implicitly indicates a type of the coverage enhancement associated with the second random access message based on the temporary cell radio network temporary identifier. 
       FIG.  7    shows a diagram of a system  700  including a device  705  that supports techniques for indicating coverage enhancement for random access procedures in wireless communications systems 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 indicating coverage enhancement for random access procedures in wireless communications systems). 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 receiving, from a base station, a first random access message including an indication as to whether a coverage enhancement is associated with a second random access message, the indication based on a condition of a channel used to receive the second random access message from the base station failing to satisfy a threshold. The communications manager  720  may be configured as or otherwise support a means for receiving, from the base station, the second random access message based on receiving the indication. 
     By including or configuring the  705  manager  720  in accordance with examples as described herein, the device  705  may support techniques for coverage enhancement in wireless communications systems, such that the device  705  may experience a reduced processing, a reduced power consumption, an increased reliability of communications, or a more efficient resource utilization, among other benefits. 
     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 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 indicating coverage enhancement for random access procedures in wireless communications systems 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 indicating coverage enhancement for random access procedures in wireless communications systems 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. 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 indicating coverage enhancement for random access procedures in wireless communications systems). 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 indicating coverage enhancement for random access procedures in wireless communications systems). In some examples, the transmitter  815  may be co-located with a receiver  810  in a transceiver component. 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 indicating coverage enhancement for random access procedures in wireless communications systems 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 transmitting, to a UE, a first random access message including an indication as to whether a coverage enhancement is associated with a second random access message, the indication based on a condition of a channel used to transmit the second random access message from the base station to the UE failing to satisfy a threshold. The communications manager  820  may be configured as or otherwise support a means for transmitting, to the UE, the second random access message based on transmitting the indication. 
     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 for coverage enhancement in wireless communications systems, such that the device  805  may experience a reduced processing, a reduced power consumption, an increased reliability of communications, or a more efficient resource utilization, among other benefits. 
       FIG.  9    shows a block diagram  900  of a device  905  that supports techniques for indicating coverage enhancement for random access procedures in wireless communications systems 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. 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 indicating coverage enhancement for random access procedures in wireless communications systems). 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 indicating coverage enhancement for random access procedures in wireless communications systems). In some examples, the transmitter  915  may be co-located with a receiver  910  in a transceiver component. 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 indicating coverage enhancement for random access procedures in wireless communications systems as described herein. For example, the communications manager  920  may include an indication transmitter  925  a message transmitter  930 , 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 indication transmitter  925  may be configured as or otherwise support a means for transmitting, to a UE, a first random access message including an indication as to whether a coverage enhancement is associated with a second random access message, the indication based on a condition of a channel used to transmit the second random access message from the base station to the UE failing to satisfy a threshold. The message transmitter  930  may be configured as or otherwise support a means for transmitting, to the UE, the second random access message based on transmitting the indication. 
       FIG.  10    shows a block diagram  1000  of a communications manager  1020  that supports techniques for indicating coverage enhancement for random access procedures in wireless communications systems 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 indicating coverage enhancement for random access procedures in wireless communications systems as described herein. For example, the communications manager  1020  may include an indication transmitter  1025 , a message transmitter  1030 , a shared channel transmitter  1035 , a control transmitter  1040 , an identifier transmitter  1045 , a joint transmitter  1050 , an independent transmitter  1055 , a preamble receiver  1060 , an enhancement component  1065 , an enhancement type component  1070 , a type shared channel transmitter  1075 , a type control transmitter  1080 , a control location transmitter  1085 , a type identifier transmitter  1090 , a message component  1095 , a channel component  10100 , a type component  10105 , 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 indication transmitter  1025  may be configured as or otherwise support a means for transmitting, to a UE, a first random access message including an indication as to whether a coverage enhancement is associated with a second random access message, the indication based on a condition of a channel used to transmit the second random access message from the base station to the UE failing to satisfy a threshold. The message transmitter  1030  may be configured as or otherwise support a means for transmitting, to the UE, the second random access message based on transmitting the indication. 
     In some examples, to support transmitting the first random access message, the shared channel transmitter  1035  may be configured as or otherwise support a means for transmitting an indication of whether the coverage enhancement is associated with the second random access message in a physical downlink shared channel payload associated with the first random access message. 
     In some examples, to support transmitting the first random access message, the control transmitter  1040  may be configured as or otherwise support a means for transmitting an indication of whether the coverage enhancement is associated with the second random access message in downlink control information associated with the first random access message. 
     In some examples, to support transmitting the first random access message, the identifier transmitter  1045  may be configured as or otherwise support a means for transmitting the first random access message using a temporary cell radio network temporary identifier, where the first random access message implicitly indicates whether the coverage enhancement is associated with the second random access message based on the temporary cell radio network temporary identifier. 
     In some examples, to support transmitting the first random access message, the joint transmitter  1050  may be configured as or otherwise support a means for transmitting an indication including one bit configured for indicating whether the coverage enhancement is associated with a physical downlink control channel payload and a physical downlink shared channel payload associated with the second random access message, where the first random access message includes the indication. 
     In some examples, to support transmitting the first random access message, the independent transmitter  1055  may be configured as or otherwise support a means for transmitting an indication including at least two bits configured for independently indicating whether the coverage enhancement is associated with a physical downlink control channel payload or a physical downlink shared channel payload or both associated with the second random access message, where the first random access message includes the indication. 
     In some examples, the preamble receiver  1060  may be configured as or otherwise support a means for receiving, from the UE, a random access preamble, where transmitting the first random access message is in response to receiving the random access preamble. 
     In some examples, the channel component  10100  may be configured as or otherwise support a means for determining a channel characteristic associated with the channel between the base station and the UE based on receiving the random access preamble, where transmitting the first random access message is based on the channel characteristic. 
     In some examples, the channel characteristic includes one or more of a reference signal received power or a signal-to-interference-plus-noise-ratio. 
     In some examples, to support receiving the random access preamble, the preamble receiver  1060  may be configured as or otherwise support a means for receiving, from the UE, a random access preamble requesting the coverage enhancement associated with the second random access message, where transmitting the first random access message is based on receiving the first random access message. 
     In some examples, the type component  10105  may be configured as or otherwise support a means for determining a type of the UE based on receiving the random access preamble, where transmitting the first random access message is based on the type of the UE. 
     In some examples, the enhancement component  1065  may be configured as or otherwise support a means for determining to perform the coverage enhancement associated with the second random access message, where transmitting the first random access message is based on the determining. In some examples, the message transmitter  1030  may be configured as or otherwise support a means for transmitting the second random access message according to the coverage enhancement. 
     In some examples, the enhancement type component  1070  may be configured as or otherwise support a means for determining that the base station is configured to use a first type of coverage enhancement associated with the second random access message, where transmitting the second random access message is based on the determining. 
     In some examples, to support transmitting the first random access message, the type shared channel transmitter  1075  may be configured as or otherwise support a means for transmitting an indication of a type of the coverage enhancement in a physical downlink shared channel payload associated with the first random access message, where the first random access message includes the indication. 
     In some examples, to support transmitting the first random access message, the type control transmitter  1080  may be configured as or otherwise support a means for transmitting an indication of a type of the coverage enhancement in a downlink control information payload associated with the first random access message, where the first random access message includes the indication. 
     In some examples, to support transmitting the first random access message, the control location transmitter  1085  may be configured as or otherwise support a means for transmitting a downlink control information payload associated with the first random access message, where the first random access message implicitly indicates a type of the coverage enhancement associated with the second random access message based on a location of the downlink control information payload in the first random access message. 
     In some examples, to support transmitting the first random access message, the type identifier transmitter  1090  may be configured as or otherwise support a means for transmitting the first random access message using a temporary cell radio network temporary identifier, where the first random access message implicitly indicates a type of the coverage enhancement associated with the second random access message based on the temporary cell radio network temporary identifier. 
     In some examples, the enhancement type component  1070  may be configured as or otherwise support a means for determining a first type of the coverage enhancement associated with the second random access message, where transmitting the first random access message includes transmitting an indication of the first type. In some examples, the message component  1095  may be configured as or otherwise support a means for receiving, from the UE, a third random access message based on transmitting the first random access message. In some examples, the enhancement type component  1070  may be configured as or otherwise support a means for determining a second type of the coverage enhancement associated with the second random access message based on transmitting the first random access message and receiving the fifth random access message, where transmitting the second random access message is based on determining the second type. 
       FIG.  11    shows a diagram of a system  1100  including a device  1105  that supports techniques for indicating coverage enhancement for random access procedures in wireless communications systems 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 indicating coverage enhancement for random access procedures in wireless communications systems). 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 transmitting, to a UE, a first random access message including an indication as to whether a coverage enhancement is associated with a second random access message, the indication based on a condition of a channel used to transmit the second random access message from the base station to the UE failing to satisfy a threshold. The communications manager  1120  may be configured as or otherwise support a means for transmitting, to the UE, the second random access message based on transmitting the indication. 
     By including or configuring the communications manager  1120  in accordance with examples as described herein, the device  1105  may support techniques for coverage enhancement in wireless communications systems, such that the device  1105  may experience a reduced processing, a reduced power consumption, an increased reliability of communications, or a more efficient resource utilization, among other benefits. 
     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 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 indicating coverage enhancement for random access procedures in wireless communications systems 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 indicating coverage enhancement for random access procedures in wireless communications systems 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 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 receiving, from a base station, a first random access message including an indication as to whether a coverage enhancement is associated with a second random access message, the indication based on a condition of a channel used to receive the second random access message from the base station failing to satisfy a threshold. 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 an indication receiver  625  as described with reference to  FIG.  6   . 
     At  1210 , the method may include receiving, from the base station, the second random access message based on receiving the indication. 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 message receiver  630  as described with reference to  FIG.  6   . 
       FIG.  13    shows a flowchart illustrating a method  1300  that supports techniques for indicating coverage enhancement for random access procedures in wireless communications systems 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 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 a base station, a first random access message including an indication as to whether a coverage enhancement is associated with a second random access message, the indication included in a PDSCH payload associated with the first random access message and based on a condition of a channel used to receive the second random access message from the base station failing to satisfy a threshold. 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 an indication receiver  625  as described with reference to  FIG.  6   . 
     At  1310 , the method may include receiving, from the base station, the second random access message based on receiving the indication. 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 message receiver  630  as described with reference to  FIG.  6   . 
       FIG.  14    shows a flowchart illustrating a method  1300  that supports techniques for indicating coverage enhancement for random access procedures in wireless communications systems 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 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 a base station, a first random access message including an indication as to whether a coverage enhancement is associated with a second random access message, the indication included in a DCI associated with the first random access message and based on a condition of a channel used to receive the second random access message from the base station failing to satisfy a threshold. 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 an indication receiver  625  as described with reference to  FIG.  6   . 
     At  1310 , the method may include receiving, from the base station, the second random access message based on receiving the indication. 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 message receiver  630  as described with reference to  FIG.  6   . 
       FIG.  15    shows a flowchart illustrating a method  1500  that supports techniques for indicating coverage enhancement for random access procedures in wireless communications systems 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 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 receiving, from a base station, a first random access message including an indication as to whether a coverage enhancement is associated with a second random access message and an indication of a type of the coverage enhancement, the indications included in a PDSCH payload associated with the first random access message and based on a condition of a channel used to receive the second random access message from the base station failing to satisfy a threshold. 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 an indication receiver  625  as described with reference to  FIG.  6   . 
     At  1510 , the method may include receiving, from the base station, the second random access message based on receiving the indication. 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 message receiver  630  as described with reference to  FIG.  6   . 
       FIG.  16    shows a flowchart illustrating a method  1500  that supports techniques for indicating coverage enhancement for random access procedures in wireless communications systems 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 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 receiving, from a base station, a first random access message including an indication as to whether a coverage enhancement is associated with a second random access message and an indication of a type of the coverage enhancement, the indications included in DCI associated with the first random access message and based on a condition of a channel used to receive the second random access message from the base station failing to satisfy a threshold. 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 an indication receiver  625  as described with reference to  FIG.  6   . 
     At  1510 , the method may include receiving, from the base station, the second random access message based on receiving the indication. 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 message receiver  630  as described with reference to  FIG.  6   . 
       FIG.  17    shows a flowchart illustrating a method  1700  that supports techniques for indicating coverage enhancement for random access procedures in wireless communications systems in accordance with aspects of the present disclosure. The operations of the method  1700  may be implemented by a base station or its components as described herein. For example, the operations of the method  1700  may be performed by a base station  105  as described 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  1705 , the method may include transmitting, to a UE, a first random access message including an indication as to whether a coverage enhancement is associated with a second random access message, the indication based on a condition of a channel used to transmit the second random access message from the base station to the UE failing to satisfy a threshold. The operations of  1705  may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of  1705  may be performed by an indication transmitter  1025  as described with reference to  FIG.  10   . 
     At  1710 , the method may include transmitting, to the UE, the second random access message based on transmitting the indication. The operations of  1710  may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of  1710  may be performed by a message transmitter  1030  as described 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: receiving, from a base station, a first random access message comprising an indication as to whether a coverage enhancement is associated with a second random access message, the indication based at least in part on a condition of a channel used to receive the second random access message from the base station failing to satisfy a threshold; receiving, from the base station, the second random access message based at least in part on receiving the indication. 
     Aspect 2: The method of aspect 1, wherein receiving the first random access message comprises: receiving an indication of whether the coverage enhancement is associated with the second random access message in a physical downlink shared channel payload associated with the first random access message. 
     Aspect 3: The method of any of aspects 1 through 2, wherein receiving the first random access message comprises: receiving an indication of whether the coverage enhancement is associated with the second random access message in downlink control information associated with the first random access message. 
     Aspect 4: The method of any of aspects 1 through 3, wherein receiving the first random access message comprises: receiving the first random access message using a temporary cell radio network temporary identifier, wherein the first random access message implicitly indicates whether the coverage enhancement is associated with the second random access message based at least in part on the temporary cell radio network temporary identifier. 
     Aspect 5: The method of any of aspects 1 through 4, wherein receiving the first random access message comprises: receiving an indication comprising one bit configured for indicating whether the coverage enhancement is associated with a physical downlink control channel payload and a physical downlink shared channel payload associated with the second random access message, wherein the first random access message comprises the indication. 
     Aspect 6: The method of any of aspects 1 through 4, wherein receiving the first random access message comprises: receiving an indication comprising at least two bits configured for independently indicating whether the coverage enhancement is associated with a physical downlink control channel payload or a physical downlink shared channel payload or both associated with the second random access message, wherein the first random access message comprises the indication. 
     Aspect 7: The method of any of aspects 1 through 6, wherein receiving the first random access message comprises: receiving an indication of a type of the coverage enhancement in a physical downlink shared channel payload associated with the first random access message, wherein the first random access message comprises the indication. 
     Aspect 8: The method of any of aspects 1 through 7, wherein receiving the first random access message comprises: receiving an indication of a type of the coverage enhancement in a downlink control information payload associated with the first random access message, wherein the first random access message comprises the indication. 
     Aspect 9: The method of any of aspects 1 through 8, wherein receiving the first random access message comprises: receiving a downlink control information payload associated with the first random access message, wherein the first random access message implicitly indicates a type of the coverage enhancement associated with the second random access message based at least in part on a location of the downlink control information payload in the first random access message. 
     Aspect 10: The method of any of aspects 1 through 9, wherein receiving the first random access message comprises: receiving the first random access message using a temporary cell radio network temporary identifier, wherein the first random access message implicitly indicates a type of the coverage enhancement associated with the second random access message based at least in part on the temporary cell radio network temporary identifier. 
     Aspect 11: A method for wireless communication at a base station, comprising: transmitting, to a UE, a first random access message comprising an indication as to whether a coverage enhancement is associated with a second random access message, the indication based at least in part on a condition of a channel used to transmit the second random access message from the base station to the UE failing to satisfy a threshold; and transmitting, to the UE, the second random access message based at least in part on transmitting the indication. 
     Aspect 12: The method of aspect 11, wherein transmitting the first random access message comprises: transmitting an indication of whether the coverage enhancement is associated with the second random access message in a physical downlink shared channel payload associated with the first random access message. 
     Aspect 13: The method of any of aspects 11 through 12, wherein transmitting the first random access message comprises: transmitting an indication of whether the coverage enhancement is associated with the second random access message in downlink control information associated with the first random access message. 
     Aspect 14: The method of any of aspects 11 through 13, wherein transmitting the first random access message comprises: transmitting the first random access message using a temporary cell radio network temporary identifier, wherein the first random access message implicitly indicates whether the coverage enhancement is associated with the second random access message based at least in part on the temporary cell radio network temporary identifier. 
     Aspect 15: The method of any of aspects 11 through 14, wherein transmitting the first random access message comprises: transmitting an indication comprising one bit configured for indicating whether the coverage enhancement is associated with a physical downlink control channel payload and a physical downlink shared channel payload associated with the second random access message, wherein the first random access message comprises the indication. 
     Aspect 16: The method of any of aspects 11 through 14, wherein transmitting the first random access message comprises: transmitting an indication comprising at least two bits configured for independently indicating whether the coverage enhancement is associated with a physical downlink control channel payload or a physical downlink shared channel payload or both associated with the second random access message, wherein the first random access message comprises the indication. 
     Aspect 17: The method of any of aspects 11 through 16, further comprising: receiving, from the UE, a random access preamble, wherein transmitting the first random access message is in response to receiving the random access preamble. 
     Aspect 18: The method of aspect 17, further comprising: determining a channel characteristic associated with the channel between the base station and the UE based at least in part on receiving the random access preamble, wherein transmitting the first random access message is based at least in part on the channel characteristic. 
     Aspect 19: The method of aspect 18, wherein the channel characteristic comprises one or more of a reference signal received power or a signal-to-interference-plus-noise-ratio. 
     Aspect 20: The method of any of aspects 17 through 19, wherein receiving the random access preamble comprises: receiving, from the UE, a random access preamble requesting the coverage enhancement associated with the second random access message, wherein transmitting the first random access message is based at least in part on receiving the first random access message. 
     Aspect 21: The method of any of aspects 17 through 20, further comprising: determining a type of the UE based at least in part on receiving the random access preamble, wherein transmitting the first random access message is based at least in part on the type of the UE. 
     Aspect 22: The method of any of aspects 11 through 21, further comprising: determining to perform the coverage enhancement associated with the second random access message, wherein transmitting the first random access message is based at least in part on the determining; and transmitting the second random access message according to the coverage enhancement. 
     Aspect 23: The method of any of aspects 11 through 22, further comprising: determining that the base station is configured to use a first type of coverage enhancement associated with the second random access message, wherein transmitting the second random access message is based at least in part on the determining. 
     Aspect 24: The method of any of aspects 11 through 23, wherein transmitting the first random access message comprises: transmitting an indication of a type of the coverage enhancement in a physical downlink shared channel payload associated with the first random access message, wherein the first random access message comprises the indication. 
     Aspect 25: The method of any of aspects 11 through 24, wherein transmitting the first random access message comprises: transmitting an indication of a type of the coverage enhancement in a downlink control information payload associated with the first random access message, wherein the first random access message comprises the indication. 
     Aspect 26: The method of any of aspects 11 through 25, wherein transmitting the first random access message comprises: transmitting a downlink control information payload associated with the first random access message, wherein the first random access message implicitly indicates a type of the coverage enhancement associated with the second random access message based at least in part on a location of the downlink control information payload in the first random access message. 
     Aspect 27: The method of any of aspects 11 through 26, wherein transmitting the first random access message comprises: transmitting the first random access message using a temporary cell radio network temporary identifier, wherein the first random access message implicitly indicates a type of the coverage enhancement associated with the second random access message based at least in part on the temporary cell radio network temporary identifier. 
     Aspect 28: The method of any of aspects 11 through 27, further comprising: determining a first type of the coverage enhancement associated with the second random access message, wherein transmitting the first random access message comprises transmitting an indication of the first type; receiving, from the UE, a third random access message based at least in part on transmitting the first random access message; and determining a second type of the coverage enhancement associated with the second random access message based at least in part on transmitting the first random access message and receiving the fifth random access message, wherein transmitting the second random access message is based at least in part on determining the second type. 
     Aspect 29: 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 10. 
     Aspect 30: An apparatus for wireless communication at a UE, comprising at least one means for performing a method of any of aspects 1 through 10. 
     Aspect 31: 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 10. 
     Aspect 32: 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 11 through 28. 
     Aspect 33: An apparatus for wireless communication at a base station, comprising at least one means for performing a method of any of aspects 11 through 28. 
     Aspect 34: 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 11 through 28. 
     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.