Patent ID: 12206483

DETAILED DESCRIPTION

For vehicle-to-everything (V2X) communications, two or more vehicles (e.g., two or more user equipment (UE)) may communicate with each other via broadcast transmissions, groupcast connections, or unicast connections. For the unicast connections, a first UE (e.g., a receiving UE) may establish multiple unicast connections with multiple other UEs (e.g., transmitting UEs), where the multiple other UEs communicate with the first UE via different transmission reception points (TRPs) of the first UE. For example, the first UE may be a vehicle and include a first TRP at the front of the vehicle and a second TRP at the rear of the vehicle. Accordingly, the first TRP may be used to communicate with other vehicles in front of the first UE, and the second TRP may be used to communicate with other vehicles behind the first UE. However, as the number of UEs/vehicles increases with which the first UE establishes unicast connections, resources allocated for the V2X communications may become overburdened if communications via the unicast connections happen at different times, and the first UE may not successfully receive or transmit messages with each of the multiple other UEs, thereby impacting the V2X communications.

As described herein, for unicast communications, to make effective use of V2X resources and enable a reliable spatial division multiplexing (SDM) reception, a receiving UE (e.g., the first UE) may coordinate the schedules with all transmitting UEs (e.g., based on V2X service type and/or directional transmission characteristics with multi-TRPs). For example, the receiving UE may establish multiple unicast connections with various transmitting UEs and may determine sets of transmission parameters for each of the transmitting UEs to enable SDM reception at the receiving UE from the transmitting UEs. That is, the receiving UE may request the transmitting UEs (e.g., via a set of transmission parameters) to adjust their schedules, transmit powers, and transmit time to enable SDM at the receiving UE based on power measurements (e.g., reference signal strength indicator (RSSI), reference signal received power (RSRP), etc.) of each TRP, transmitter UE biased information, etc.

Accordingly, transmissions from a given SDMed transmitter UE may be received in a separate TRP considering transmission directionality and imbalanced per-TRP power measurements. In some cases, the receiving UE may transmit the set of transmission parameters via a second-stage sidelink control information (SCI) message. Additionally, the receiving UE may transmit an indication of a demodulation reference signal (DMRS) cyclic shift and/or an indication of a channel measurement resource (CMR) and interference measurement resource (IMR) to the transmitting UEs to further enable the receiving UE to SDM transmissions from the transmitting UEs on a same set of time and frequency resources.

Aspects of the disclosure are initially described in the context of wireless communications systems. Additionally, aspects of the disclosure are illustrated by an additional wireless communications system, cast types, a link establishment, a physical channel structure, unicast establishments, a resource pattern, and a process flow. Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flowcharts that relate to unicast coordination for SDM communications.

FIG.1illustrates an example of a wireless communications system100that supports unicast coordination for SDM communications in accordance with aspects of the present disclosure. The wireless communications system100may include one or more base stations105, one or more UEs115, and a core network130. In some examples, the wireless communications system100may 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 system100may 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 stations105may be dispersed throughout a geographic area to form the wireless communications system100and may be devices in different forms or having different capabilities. The base stations105and the UEs115may wirelessly communicate via one or more communication links125. Each base station105may provide a coverage area110over which the UEs115and the base station105may establish one or more communication links125. The coverage area110may be an example of a geographic area over which a base station105and a UE115may support the communication of signals according to one or more radio access technologies.

The UEs115may be dispersed throughout a coverage area110of the wireless communications system100, and each UE115may be stationary, or mobile, or both at different times. The UEs115may be devices in different forms or having different capabilities. Some example UEs115are illustrated inFIG.1. The UEs115described herein may be able to communicate with various types of devices, such as other UEs115, the base stations105, or network equipment (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network equipment), as shown inFIG.1.

The base stations105may communicate with the core network130, or with one another, or both. For example, the base stations105may interface with the core network130through one or more backhaul links120(e.g., via an S1, N2, N3, or other interface). The base stations105may communicate with one another over the backhaul links120(e.g., via an X2, Xn, or other interface) either directly (e.g., directly between base stations105), or indirectly (e.g., via core network130), or both. In some examples, the backhaul links120may be or include one or more wireless links.

One or more of the base stations105described 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 UE115may 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 UE115may 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 UE115may 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 UEs115described herein may be able to communicate with various types of devices, such as other UEs115that may sometimes act as relays as well as the base stations105and the network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, as shown inFIG.1.

The UEs115and the base stations105may wirelessly communicate with one another via one or more communication links125over 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 links125. For example, a carrier used for a communication link125may include a portion of a radio frequency spectrum band (e.g., a bandwidth part (BWP)) that is operated according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling that coordinates operation for the carrier, user data, or other signaling. The wireless communications system100may support communication with a UE115using carrier aggregation or multi-carrier operation. A UE115may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used with both frequency division duplexing (FDD) and time division duplexing (TDD) component carriers.

In some examples (e.g., in a carrier aggregation configuration), a carrier may also have acquisition signaling or control signaling that coordinates operations for other carriers. A carrier may be associated with a frequency channel (e.g., an evolved universal mobile telecommunication system terrestrial radio access (E-UTRA) absolute radio frequency channel number (EARFCN)) and may be positioned according to a channel raster for discovery by the UEs115. A carrier may be operated in a standalone mode where initial acquisition and connection may be conducted by the UEs115via the carrier, or the carrier may be operated in a non-standalone mode where a connection is anchored using a different carrier (e.g., of the same or a different radio access technology).

The communication links125shown in the wireless communications system100may include uplink transmissions from a UE115to a base station105, or downlink transmissions from a base station105to a UE115. Carriers may carry downlink or uplink communications (e.g., in an FDD mode) or may be configured to carry downlink and uplink communications (e.g., in a TDD mode).

A carrier may be associated with a particular bandwidth of the radio frequency spectrum, and in some examples the carrier bandwidth may be referred to as a “system bandwidth” of the carrier or the wireless communications system100. For example, the carrier bandwidth may be one of a number of determined bandwidths for carriers of a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz)). Devices of the wireless communications system100(e.g., the base stations105, the UEs115, or both) may have hardware configurations that support communications over a particular carrier bandwidth or may be configurable to support communications over one of a set of carrier bandwidths. In some examples, the wireless communications system100may include base stations105or UEs115that support simultaneous communications via carriers associated with multiple carrier bandwidths. In some examples, each served UE115may be configured for operating over portions (e.g., a sub-band, a BWP) or all of a carrier bandwidth.

Signal waveforms transmitted over a carrier may be made up of multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system employing MCM techniques, a resource element may consist of one symbol period (e.g., a duration of one modulation symbol) and one subcarrier, where the symbol period and subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both). Thus, the more resource elements that a UE115receives and the higher the order of the modulation scheme, the higher the data rate may be for the UE115. 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 UE115.

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 UE115may 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 UE115may be restricted to one or more active BWPs.

The time intervals for the base stations105or the UEs115may be expressed in multiples of a basic time unit which may, for example, refer to a sampling period of Ts=1/(Δfmax·Nf) seconds, where Δfmaxmay represent the maximum supported subcarrier spacing, and Nfmay 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 systems100, 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., Nf) 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 system100and 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 system100may 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 UEs115. For example, one or more of the UEs115may 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 UEs115and UE-specific search space sets for sending control information to a specific UE115.

Each base station105may 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 station105(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 area110or a portion of a geographic coverage area110(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 station105. For example, a cell may be or include a building, a subset of a building, or exterior spaces between or overlapping with geographic coverage areas110, among other examples.

A macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by the UEs115with service subscriptions with the network provider supporting the macro cell. A small cell may be associated with a lower-powered base station105, 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 UEs115with service subscriptions with the network provider or may provide restricted access to the UEs115having an association with the small cell (e.g., the UEs115in a closed subscriber group (CSG), the UEs115associated with users in a home or office). A base station105may 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 station105may be movable and therefore provide communication coverage for a moving geographic coverage area110. In some examples, different geographic coverage areas110associated with different technologies may overlap, but the different geographic coverage areas110may be supported by the same base station105. In other examples, the overlapping geographic coverage areas110associated with different technologies may be supported by different base stations105. The wireless communications system100may include, for example, a heterogeneous network in which different types of the base stations105provide coverage for various geographic coverage areas110using the same or different radio access technologies.

The wireless communications system100may support synchronous or asynchronous operation. For synchronous operation, the base stations105may have similar frame timings, and transmissions from different base stations105may be approximately aligned in time. For asynchronous operation, the base stations105may have different frame timings, and transmissions from different base stations105may, in some examples, not be aligned in time. The techniques described herein may be used for either synchronous or asynchronous operations.

Some UEs115, such as MTC or IoT devices, may be low cost or low complexity devices and may provide for automated communication between machines (e.g., via Machine-to-Machine (M2M) communication). M2M communication or MTC may refer to data communication technologies that allow devices to communicate with one another or a base station105without human intervention. In some examples, M2M communication or MTC may include communications from devices that integrate sensors or meters to measure or capture information and relay such information to a central server or application program that makes use of the information or presents the information to humans interacting with the application program. Some UEs115may be designed to collect information or enable automated behavior of machines or other devices. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based business charging.

Some UEs115may 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 UEs115include 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 UEs115may 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 system100may be configured to support ultra-reliable communications or low-latency communications, or various combinations thereof. For example, the wireless communications system100may be configured to support ultra-reliable low-latency communications (URLLC) or mission critical communications. The UEs115may 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.

The core network130may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network130may 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 UEs115served by the base stations105associated with the core network130. 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 services150for one or more network operators. The IP services150may 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 station105, may include subcomponents such as an access network entity140, which may be an example of an access node controller (ANC). Each access network entity140may communicate with the UEs115through one or more other access network transmission entities145, which may be referred to as radio heads, smart radio heads, or TRPs. Each access network transmission entity145may include one or more antenna panels. In some configurations, various functions of each access network entity140or base station105may be distributed across various network devices (e.g., radio heads and ANCs) or consolidated into a single network device (e.g., a base station105).

The wireless communications system100may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Generally, the region from 300 MHz to 3 GHz is known as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately one decimeter to one meter in length. The UHF waves may be blocked or redirected by buildings and environmental features, but the waves may penetrate structures sufficiently for a macro cell to provide service to the UEs115located 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 system100may utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communications system100may 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 stations105and the UEs115may 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 station105or a UE115may 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 station105or a UE115may 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 station105may be located in diverse geographic locations. A base station105may have an antenna array with a number of rows and columns of antenna ports that the base station105may use to support beamforming of communications with a UE115. Likewise, a UE115may have one or more antenna arrays that may support various MIMO or beamforming operations. Additionally or alternatively, an antenna panel may support radio frequency beamforming for a signal transmitted via an antenna port.

The base stations105or the UEs115may use MIMO communications to exploit multipath signal propagation and increase the spectral efficiency by transmitting or receiving multiple signals via different spatial layers. Such techniques may be referred to as spatial multiplexing. The multiple signals may, for example, be transmitted by the transmitting device via different antennas or different combinations of antennas. Likewise, the multiple signals may be received by the receiving device via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers may be associated with different antenna ports used for channel measurement and reporting. MIMO techniques include single-user MIMO (SU-MIMO), where multiple spatial layers are transmitted to the same receiving device, and multiple-user MIMO (MU-MIMO), where multiple spatial layers are transmitted to multiple devices.

Beamforming, which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station105, a UE115) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining the signals communicated via antenna elements of an antenna array such that some signals propagating at particular orientations with respect to an antenna array experience constructive interference while others experience destructive interference. The adjustment of signals communicated via the antenna elements may include a transmitting device or a receiving device applying amplitude offsets, phase offsets, or both to signals carried via the antenna elements associated with the device. The adjustments associated with each of the antenna elements may be defined by a beamforming weight set associated with a particular orientation (e.g., with respect to the antenna array of the transmitting device or receiving device, or with respect to some other orientation).

A base station105or a UE115may use beam sweeping techniques as part of beam forming operations. For example, a base station105may use multiple antennas or antenna arrays (e.g., antenna panels) to conduct beamforming operations for directional communications with a UE115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted by a base station105multiple times in different directions. For example, the base station105may 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 station105, or by a receiving device, such as a UE115) a beam direction for later transmission or reception by the base station105.

Some signals, such as data signals associated with a particular receiving device, may be transmitted by a base station105in a single beam direction (e.g., a direction associated with the receiving device, such as a UE115). 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 UE115may receive one or more of the signals transmitted by the base station105in different directions and may report to the base station105an indication of the signal that the UE115received with a highest signal quality or an otherwise acceptable signal quality.

In some examples, transmissions by a device (e.g., by a base station105or a UE115) 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 station105to a UE115). The UE115may 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 station105may 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 UE115may 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 station105, a UE115may 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 UE115) or for transmitting a signal in a single direction (e.g., for transmitting data to a receiving device).

A receiving device (e.g., a UE115) may try multiple receive configurations (e.g., directional listening) when receiving various signals from the base station105, 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 system100may 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 UE115and a base station105or a core network130supporting radio bearers for user plane data. At the physical layer, transport channels may be mapped to physical channels.

The UEs115and the base stations105may 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 link125. 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, a UE115may also be able to communicate directly with other UEs115over a device-to-device (D2D) communication link135(e.g., using a peer-to-peer (P2P) or D2D protocol). One or more UEs115utilizing D2D communications may be within the geographic coverage area110of a base station105. Other UEs115in such a group may be outside the geographic coverage area110of a base station105or be otherwise unable to receive transmissions from a base station105. In some examples, groups of the UEs115communicating via D2D communications may utilize a one-to-many (1:M) system in which each UE115transmits to every other UE115in the group. In some examples, a base station105facilitates the scheduling of resources for D2D communications. In other cases, D2D communications are carried out between the UEs115without the involvement of a base station105.

In some systems, the D2D communication link135may be an example of a communication channel, such as a sidelink communication channel, between vehicles (e.g., UEs115). In some examples, vehicles may communicate using V2X communications, vehicle-to-vehicle (V2V) communications, or some combination of these. A vehicle may signal information related to traffic conditions, signal scheduling, weather, safety, emergencies, or any other information relevant to a V2X system. In some examples, vehicles in a V2X system may communicate with roadside infrastructure, such as roadside units, or with the network via one or more network nodes (e.g., base stations105) using vehicle-to-network (V2N) communications, or with both.

For V2X communications, two or more vehicles (e.g., two or more UEs115) may communicate with each other via broadcast transmissions, groupcast connections, or unicast connections. For the unicast connections, a first UE115(e.g., a receiving UE115) may establish multiple unicast connections with multiple other UEs115(e.g., transmitting UEs115). However, as the number of UEs/vehicles increases with which the first UE115establishes unicast connections, resources allocated for the V2X communications may become overburdened if communications via the unicast connections happen at different times and on different resources in the allocated V2X resources, and the first UE115may not successfully receive or transmit messages with each of the multiple other UEs115, thereby impacting the V2X communications.

Wireless communications system100may support an effective use of V2X resources for unicast communications based on a receiving UE115(e.g., the first UE115) coordinating transmissions for multiple transmitting UEs115with which the receiving UE115has established unicast connections (e.g., unicast links) to enable SDM at the receiving UE115for received messages from the multiple transmitting UEs115on a same set of time and frequency resources. For example, the receiving UE115may establish multiple unicast connections with various transmitting UEs115and may determine sets of transmission parameters for each of the transmitting UEs115to enable SDM reception at the receiving UE115of messages from the transmitting UEs115. That is, the receiving UE115may request the transmitting UEs115(e.g., via transmitting a respective set of transmission parameters to each transmitting UE115) to adjust their schedules, transmit powers, and transmit time to enable SDM at the receiving UE, where the different transmission parameters are based on power measurements (e.g., RSSI, RSRP, etc.) of each TRP, transmitter UE biased information, or a combination thereof. In some implementations, the receiving UE115may transmit the set of transmission parameters to each transmitting UE115via a second-stage SCI message.

FIG.2illustrates an example of a wireless communications system200that supports unicast coordination for SDM communications in accordance with aspects of the present disclosure. Wireless communications system200may implement aspects of wireless communications system100. For example, wireless communications system200may include multiple UEs115, such as a receiving UE115-a, a first transmitting UE115-b, a second transmitting UE115-c, a third transmitting UE115-d, and a fourth transmitting UE115-e, which may represent examples of UEs115as described with reference toFIG.1. Wireless communications system200may also support V2X communications between receiving UE115-aand the transmitting UEs115, where the V2X communications may include sidelink communications between the UEs115.

Additionally, receiving UE115-amay include multiple TRPs205for communications with the different transmitting UEs115. Multi-TRP sidelink communications may enhance coverage for the communications between receiving UE115-aand the transmitting UEs115. Additionally, the multiple TRPs205may improve reliability, coverage, and capacity performance through flexible deployment scenarios. More specifically, multiple TRPs205equipped in different part of vehicles (e.g., in receiving UE115-a) may improve reliability in safety and other high robustness desired applications. In some cases, from a transmission point of view, data coverage may be biased. For example, side coverage may not be importance for certain cases (e.g., TRPs located on the side of a vehicle may not provide much value), and front or back biased or 360-degree coverage around the vehicle may be dependent on a packet content or type. From a receiver point of view, the multiple TRPs205at the vehicles may desire for 360-degree coverage. As such, receiving UE115-amay use both TRPs205to receive packets from other UEs115(e.g., the transmitting UEs115).

As shown, receiving UE115-amay include a first TRP205-aat the rear of the vehicle and a second TRP205-bat the front of the vehicle. Accordingly, receiving UE115-amay receive packets from the first transmitting UE115-band the second transmitting UE115-cvia first TRP205-aand may receive packets from the third transmitting UE115-dand the fourth transmitting UE115-evia second TRP205-b. With each TRP205, receiving UE115-amay establish respective unicast connections (e.g., unicast links) with each transmitting UE115. For example, receiving UE115-amay establish a first unicast connection210-awith the first transmitting UE115-bvia first TRP205-a, a second unicast connection210-bwith the second transmitting UE115-cvia first TRP205-a, a third unicast connection210-cwith the third transmitting UE115-dvia second TRP205-b, and a fourth unicast connection210-dwith the fourth transmitting UE115-evia second TRP205-b. In some cases, each unicast connection210may be referred to as a PC5 unicast link based on the sidelink communications between the receiving UE115-aand each of the transmitting UEs115and that the sidelink communications occur over a PC5 interface.

As described herein, to make effective use of V2X resources (e.g., time and frequency resources allocated for the V2X communications) and to enable reliable SDM reception using the unicast connections210, receiving UE115-amay coordinate schedules with all the transmitting UEs115. In some implementations, the schedule coordination may be in view of, for example, a V2X service type and/or directional transmission characteristics based on the multiple TRPs205. That is, receiving UE115-amay coordinate how each of the transmitting UEs115should transmit packets based on a V2X service type, with which TRP205each transmitting UE115is connected to receiving UE115-a, or both. Additionally, by coordinating the schedule for all the transmitting UEs115, receiving UE115-amay be able to receive the packets from the transmitting UEs115on a same set of time and frequency resources (e.g., at the same time on a same set of frequencies) using an SDM configuration or scheme. Accordingly, receiving UE115-amay receive V2X service data from the multiple transmitting UEs115via the respective unicast connections210, where the received V2X service data can be SDMed at receiving UE115-afrom the transmitting UEs115according to transmission directionality (e.g., measured via RSRP) at receiving UE115-a.

As part of coordinating the schedules with the transmitting UEs115, receiving UE115-amay request each transmitting UE115to adjust their schedules, transmit powers, and transmit times (e.g., transmission parameters) to enable SDM reception at receiving UE115-a. In some implementations, receiving UE115-amay determine the adjustments for each transmitting UE115based on an RSSI or RSRP measurement of each TRP205of receiving UE115-a, on transmission biased information, or a combination thereof. That is, packets from one of the SDMed transmitter UEs115may be received in a separate TRP205considering transmission directionality and imbalanced per-TRP power measurement. In this case, receiving UE115-amay instruct recommended time and frequency resources to the transmitting UEs115to allow different transmitting UEs115to use the same or overlapping resources. Accordingly, based on these techniques, SDM reception in the various unicast connections may be supported by receiving UE115-a(e.g., a multi-TRP capable UE). Receiving UE115-amay indicate the coordination information (e.g., sets of transmission parameters) to the transmitting UEs115as part of a second-stage SCI message (e.g., as a resource bit map).

For example, receiving UE115may determine different sets of transmission parameters215for each of the transmitting UEs115and then may transmit each set of transmission parameters215to the respective transmitting UEs115. As shown, receiving UE115-amay transmit a first set of transmission parameters215-ato the first transmitting UE115-bvia the first unicast connection210-a, a second set of transmission parameters215-bto the second transmitting UE115-cvia the second unicast connection210-b, a third set of transmission parameters215-cto the third transmitting UE115-dvia the third unicast connection210-c, and a fourth set of transmission parameters215-dto the fourth transmitting UE115-evia the fourth unicast connection210-d. These transmission parameters215may enable the SDM reception of packets from the transmitting UEs115at receiving UE115-aby adjusting transmit powers of the different transmitting UEs115, allowing receiving UE115-ato identify the individual packet transmissions from each transmitting UE115on the same set of time and frequency resources based on the different transmit powers.

Additionally, based on the multiple TRPs205, receiving UE115-amay indicate same coordination information to a transmitting UE115connected to first TRP205-a(e.g., first transmitting UE115-bor second transmitting UE115-c) and to a transmitting UE115connected to second TRP205-b(e.g., third transmitting UE115-dor fourth transmitting UE115-e). That is, the coordination information for each transmitting UE115may be determined on a per-TRP basis. Receiving UE115-amay be able to determine the coordination information per-TRP because transmissions received on first TRP205-amay have a minimal impact on transmissions received on second TRP205-bbased on directional transmissions (e.g., beamformed transmissions) from the different transmitting UEs115.

In some implementations, receiving UE115-amay determine additional parameters or information for each of the transmitting UEs115and transmit these additional parameters or information to each transmitting UE115to further enable receiving UE115-ato receive the packets from the transmitting UEs115on the same set of time and frequency resources and enable the SDM reception of the packets. For example, receiving UE115-amay determine and indicate recommended control DMRS cyclic shifts to each transmitting UE115, where the recommended control DMRS cyclic shifts may indicate different coding resources for each transmitting UE115for enabling reception of the packets at receiving UE115-aon the colliding time and frequency resources. Additionally or alternatively, receiving UE115-amay determine and indicate recommended CMR(s) and IMR(s) to each of the transmitting UEs115, which may enable receiving UE115to perform an accurate channel estimation for then combining packets among the multiple TRPs205.

FIGS.3A,3B,3C, and3Dillustrate examples of cast types300,301,302, and303in accordance with aspects of the present disclosure. Cast types300,301,302, and303may implement aspects of wireless communications systems100and200. For example, cast types300,301,302, and303may include one or more UEs115, where the UEs115communicate with each other via sidelinks and V2X communications.

Cast type300may represent a broadcast configuration for a UE115to transmit V2X packets or information to one or more UEs115. For example, cast type300may include one or more broadcasts305-aand305-bthat are transmitted by a UE115and are available for any nearby UEs115to receive. The broadcasts305may not be directed or transmitted specifically to any UE115and rather may be transmitted in all directions from a UE115. The broadcasts305may include V2X data for nearby UEs115.

Cast type301may represent a connectionless groupcast configuration for a UE115to transmit V2X packets or information to one or more UEs115. The connectionless groupcast configuration may be a negative acknowledgment (NACK) based configuration. For example, a UE115may first transmit V2X data out to nearby UEs115using broadcasts305-aand305-bfor a range310and may receive a NACK feedback message (e.g., a physical (PHY) layer acknowledgment feedback message) from one or more of the nearby UEs115(e.g., indicating the V2X data was unsuccessfully received). Subsequently, the UE115may then retransmit the V2X data specifically to those UEs115that transmitted the NACK feedback message.

Cast type302may represent a managed groupcast configuration for a UE115to transmit V2X packets or information to one or more UEs115. The managed groupcast configuration may be a positive acknowledgment (ACK) based configuration. For example, a UE115may first transmit V2X data to a managed group315of UEs115, where after receiving an ACK from one or more UEs115in the managed group, the UE115may then receive V2X data from the one or more UEs115.

Cast type303may represent a unicast configuration for a UE115to transmit V2X packets or information to an additional, single UE115. With the unicast configuration, the UE115and the additional UE115may exchange one or more messages320. For example, the two UEs115may first exchange control signaling to establish the unicast connection (e.g., unicast link) via different layers (e.g., PC5 sidelink (PC5-S), PC5-RRC, etc.). Then, the two UEs115may exchange acknowledgment feedback to indicate whether the unicast connection was successfully established before then transmitting V2X data between each other.

FIG.4illustrates an example of a link establishment400in accordance with aspects of the present disclosure. Link establishment400may implement aspects of wireless communications systems100and200. For example, link establishment400may include a receiving UE405and one or more transmitting UEs410, such as a first transmitting UE410-aand a second transmitting UE410-b. Link establishment400may represent a layer-2 link establishment for multiple unicast connections. For example, receiving UE405may establish multiple PC5 unicast connections (e.g., unicast links) with multiple peer UEs115. That is, both the first transmitting UE410-aand the second transmitting UE410-bmay establish unicast connections with receiving UE405according to link establishment400.

At415, receiving UE405may determine a destination layer-2 identification for signaling reception. For example, receiving UE405may determine the transmitting UEs410for signaling reception and identifications of the transmitting UEs115.

At420, a V2X application layer of the transmitting UEs410may provide application information for the transmitting UEs410for a PC5 unicast communication with receiving UE405. At425, the transmitting UEs410may transmit a direct communication request to receiving UE405based on the application information provided by the V2X application layer.

At430, receiving UE405may perform a security establishment with the transmitting UEs410based on the direct communication request. At435, after establishing the security, receiving UE405may transmit a direct communication accept message to each transmitting UE410via respective unicast connections (e.g., unicast links). Subsequently, at440, receiving UE405and the transmitting UEs410may begin transmitting V2X service data to each other over the unicast connections. For example, receiving UE405may receive V2X service data from both the first transmitting UE410-aand the second transmitting UE410-bwith dedicated unicast connections.

FIG.5illustrates an example of a physical channel structure500in accordance with aspects of the present disclosure. Physical channel structure500may implement aspects of wireless communications systems100and200. For example, two UEs115may communicate with each other using sidelink communications that are configured based on physical channel structure500. Physical channel structure500may be used for resource reservation and PHY layer processing. Additionally, physical channel structure500may be used for both periodic and aperiodic transmissions. In some cases, a transmission may reserve resources in a current slot and in up to two future slots.

Physical channel structure500may include a physical sidelink control channel (PSCCH)505, a physical sidelink shared channel (PSSCH)510, one or more gaps515, and a physical sidelink feedback channel (PSFCH)520. A first stage control message (e.g., a first SCI message, SCI-1, etc.) may be transmitted on PSCCH505and may contain information for resource allocation and for decoding a second stage control message. PSCCH505may be limited to a single sub-channel, and a frequency domain orthogonal cover code (FD-OCC) may be applied to DMRS to reduce impact of colliding PSCCH transmissions. In some cases, a transmitter UE115may randomly select the FD-OCC from a set of pre-defined FD-OCCs. A second stage control message (e.g., a second SCI message, SCI-2, etc.) may be transmitted on PSSCH510and may contain information for decoding data (e.g., shared channel (SCH) transmissions). Accordingly, a receiver UE115may decode the SCI firstly (e.g., both the first stage control message and the second stage control message) and then decode the data. Subsequently, the receiver UE115may then transmit feedback (e.g., HARQ feedback) on resources in PSFCH520after the gap515according to a cast type and a feedback mode.

Accordingly, as described herein, when multiple unicast connections are established between a receiving UE115and multiple transmitting UEs115and to enable SDM reception of packets from the multiple transmitting UEs115, the receiving UE115may determine transmission parameters (e.g., coordination information) for each of the multiple transmitting UEs115and may transmit the determined transmission parameters to the respective transmitting UEs115via the second stage control message in PSSCH510.

FIG.6illustrates an example of a unicast establishment600that supports unicast coordination for SDM communications in accordance with aspects of the present disclosure. Unicast establishment600may implement aspects of wireless communications systems100and200. For example, unicast establishment600may include a receiving UE605and one or more transmitting UEs610, such as a first transmitting UE610-a, a second transmitting UE610-b, a third transmitting UE610-c, and a fourth transmitting UE610-d.

At615, receiving UE605and each of the transmitting UEs610may establish respective unicast links (e.g., unicast connections). For example, the unicast links may be established as described previously with reference toFIG.4.

At620, with multiple unicast links established, for SDM reception, in order to decode SCI (e.g., sidelink packets) in colliding time and frequency resources, receiving UE605may coordinate unicast schedules to enable reliable SDM reception with the transmitting UEs610. As part of coordinating the unicast schedules, receiving UE605may

At625, receiving UE605may transmit an SCI transmission (e.g., second stage SCI) to each transmitting UE610to indicate transmission parameters for the coordinating of the unicast schedules. Additionally, receiving UE605may indicate a recommended control DMRS cyclic shift to be used by each SDMed transmitting UE615to guarantee accurate channel and a signal-to-interference-plus-noise ratio (SINR) estimation. For example, receiving UE605may indicate the recommended cyclic shift used for subsequent SCI transmissions sent by the transmitting UEs610to avoid resource collision leading to detection failure. The recommend control DMRS cyclic shift may be used to differentiate coding resource among the SDMed transmitting UEs610, and receiving UE605may transmit the recommended control DMRS cyclic shifts via a second stage SCI as part of UE coordination information. In some implementation, the selection of the transmitting UEs610for the SDM reception may be based on an SCI detection and signal measurements (e.g., RSRP or RSSI measurements) among multiple TPRs located in receiving UE605.

FIG.7illustrates an example of a unicast establishment700that supports unicast coordination for SDM communications in accordance with aspects of the present disclosure. Unicast establishment700may implement aspects of wireless communications systems100and200. For example, unicast establishment700may include a receiving UE705and one or more transmitting UEs710, such as a first transmitting UE710-a, a second transmitting UE710-b, a third transmitting UE710-c, and a fourth transmitting UE710-d.

At715, receiving UE705and each of the transmitting UEs710may establish respective unicast links (e.g., unicast connections). For example, the unicast links may be established as described previously with reference toFIG.4.

At720, with multiple unicast links established, for SDM reception, in order to decode SCI (e.g., sidelink packets) in colliding time and frequency resources, receiving UE705may coordinate unicast schedules to enable reliable SDM reception with the transmitting UEs710. Additionally, to enable reliable SDM reception, receiving UE705may indicate a recommended CMR and IMR to each SDMed transmitting UE710. The recommended CMR and IMR may enable receiving UE705to yield accurate channel or SINR estimation for reception combining among multiple TRPs located in receiving UE705or to decide if reception combining is doable. For example, receiving UE705may use the recommend CMR and IMR as part of estimating channel and interference levels at colliding time and frequency resources used by the SDMed transmitting UEs710among the multiple TRPs located in receiving UE705. In some implementation, receiving UE705may transmit this indication of the CMR and IMR via a second stage SCI as part of UE coordination information.

FIG.8illustrates an example of a resource pattern800that supports unicast coordination for SDM communications in accordance with aspects of the present disclosure. Resource pattern800may implement aspects of wireless communications systems100and200. For example, a receiving UE115may transmit an indication of resource pattern800to one or more transmitting UEs115to enable the receiving UE115to SDM transmissions received from the transmitting UEs115on a same set of time and frequency resources. As shown, the receiving UE may receive first transmissions805-afrom a first transmitting UE115, second transmissions805-bfrom a second transmitting UE115, third transmissions805-cfrom a third transmitting UE115, and fourth transmissions805-dfrom a fourth transmitting UE115. The transmissions805from each transmitting UE115may be located on separate sub-channels810. In some implementations, the first transmissions805-aand the second transmissions805-bmay be SDMed at the receiving UE115(e.g., via a first TRP), and the third transmissions805-cand the fourth transmissions805-dmay be SDMed at the receiving UE115(e.g., via a second TRP).

Additionally, resource pattern800may include one or more CMRs815and one or more IMRs820. As described previously with reference toFIG.7, the CMR(s)815and the IMR(s)820may be used by the receiving UE115to yield accurate channel or SINR estimation for reception combining among multiple TRPs located in the receiving UE115or to decide if reception combining is doable. Additionally, the receiving UE115may transmit an indication of the CMRs815and the IMRs820via a second stage SCI (e.g., with an indication of resource pattern800or independently of the indication of resource pattern800).

In some implementations, the CMRs815and IMRs820may be as part of a channel state information reference signal (CSI-RS) configuration. Additionally or alternatively, the CMRs815and the IMRs820may be as part of a control DMRS, a data DMRS, or even data or control resource elements (REs).

Additionally, one or more of the transmitting UEs115may introduce zero power (ZP) resources to enable the receiving UE115to estimate the interference power from other SDMed transmitting UEs115. For example, the one or more transmitting UEs115may transmit the ZP resources using the IMRs820used for interference measurement in the receiving UE115when SDM reception is enabled. The receiving UE115may then use the IMRs820to estimate per-TRP interference measurements and to decide if reception combining across the TRPs is enabled.

To enable reliable SDM receiving, the receiving UE115may decide to trigger the CMRs815and IMRs820scheduling. For example, the receiving UE115may determine to trigger the CMRs815and IMRs820scheduling based on resource reservation information decoded by an SDM receiving procedure, a channel busy ratio (CBR) measurement, etc. Additionally or alternatively, the CMRs815and IMRs820may be triggered or scheduled by one or more of the transmitting UEs115. For example, the one or more transmitting UEs115may determine to trigger the CMRs815and the IMRs820based on CBR measurements, consecutive transmission failures, etc. In some implementations, the receiving UE115may then reconfigure a resource allocation to include the CMRs815and the IMRs820for all the transmitting UEs115based on a trigger received by the one or more transmitting UEs115or a reconfigured resource allocation may be recommended by the receiving UE115.

FIG.9illustrates an example of a process flow900that supports unicast coordination for SDM communications in accordance with aspects of the present disclosure. Process flow900may implement aspects of wireless communications systems100and200. For example, process flow900may include a receiving UE115-fand one or more transmitting UEs115, such as a transmitting UE115-gand a transmitting UE115-h.

In the following description of the process flow900, the operations between the receiving UE115-f, the transmitting UE115-g, and the transmitting UE115-hmay be transmitted in a different order than the exemplary order shown, or the operations performed by the receiving UE115-f, the transmitting UE115-g, and the transmitting UE115-hmay be performed in different orders or at different times. Certain operations may also be left out of the process flow900, or other operations may be added to the process flow900. It is to be understood that while the receiving UE115-f, the transmitting UE115-g, and the transmitting UE115-hare shown performing a number of the operations of process flow900, any wireless device may perform the operations shown.

At905, the transmitting UE115-gand the transmitting UE115-hmay transmit, to the receiving UE115-f, a request to establish a unicast connection (e.g., unicast connection requests) with a first TRP of multiple TRPs for the receiving UE115-f.

At910, the receiving UE115-fmay establish a set of unicast connections with multiple transmitting UEs115including the transmitting UE115-gand the transmitting UE115-h(e.g., based on the request to establish the unicast connection), the multiple transmitting UEs115including one or more first transmitting UEs115connected to the first TRP of the receiving UE115-fvia respective unicast connections of the set of unicast connections and one or more second transmitting UEs115connected to a second TRP of the receiving UE115-fvia respective unicast connections of the set of unicast connections. In some implementations, the receiving UE115-fmay select the multiple transmitting UEs115for establishing the set of unicast connections based on detecting an SCI message from each of the multiple transmitting UEs115(e.g., the unicast connection requests), performing a signal quality measurement among the first TRP and the second TRP of the receiving UE115-ffor each transmitting UE115, or a combination thereof.

At915, the receiving UE115-fmay determine a plurality of sets of transmission parameters for the multiple transmitting UEs115, where the plurality of sets of transmission parameters may enable the receiving UE115-fto receive transmissions from the multiple transmitting UEs115on a same set of time and frequency resources via an SDM scheme. In some implementations, the receiving UE115-fmay determine the plurality of sets of transmission parameters for the respective transmitting UEs of the multiple transmitting UEs based on which TRP of the receiving UE115-fis used for a respective unicast connection with a transmitting UE115of the multiple transmitting UEs. Additionally, a same set of transmission parameters may be used for a first transmitting UE115and for a second transmitting UE115of the multiple transmitting UEs115based on a first unicast connection being established between the first transmitting UE115and the receiving UE115-fvia the first TRP and a second unicast connection being established between the second transmitting UE115and the receiving UE115-fvia the second TRP.

In some implementations, the receiving UE115-fmay determine the plurality of sets of transmission parameters based on one or more signal quality measurements of the set of unicast connections. For example, the one or more signal quality measurements may include an RSSI measurement, an RSRP measurement, biased information for each of the multiple transmitting UEs115, or a combination thereof. Additionally, each set of transmission parameters may include a transmission schedule adjustment, a transmit power, a transmit time, an indication of the time and frequency resources, or a combination thereof.

At920, the receiving UE115-fmay transmit each set of transmission parameters from the plurality of sets of transmission parameters to respective transmitting UEs115of the multiple transmitting UEs115. In some implementations, the receiving UE115-fmay transmit each set of transmission parameters via an SCI message to the respective transmitting UEs115. For example, each set of transmission parameters may be indicated via a resource bit map in the SCI message. Additionally, the SCI message may be a second stage SCI message.

At925, the receiving UE115-fmay transmit, to the respective transmitting UEs115, an indication for a control DMRS cyclic shift for each transmitting UE115to use when transmitting communications to the receiving UE115-f, where the control DMRS cyclic shift further enables the receiving UE115-fto receive the transmissions from the multiple transmitting UEs115on the same set of time and frequency resources via the SDM scheme. In some implementations, the receiving UE115-fmay transmit the indication for the control DMRS cyclic shift to the respective transmitting UEs115via an SCI message. For example, the SCI message may be a second stage SCI message for UE coordination.

At930, the receiving UE115-fmay transmit, to the respective transmitting UEs115, an indication of a CMR and an IMR. In some implementations, the receiving UE115-fmay transmit the indication of the CMR and the IMR to each transmitting UE115via an SCI message. For example, the SCI message may be a second stage SCI message for UE coordination.

In some implementations, the receiving UE115-fmay determine to transmit the indication of the CMR and the IMR based on a trigger. For example, the trigger may include a resource reservation information message decoded based on the SDM scheme, a CBR measurement, receiving an indication to trigger the CMR and the IMR from one or more transmitting UEs115from the multiple transmitting UEs115, or a combination thereof. In some implementations, the CMR and the IMR may be part of a CSI-RS configuration. Additionally or alternatively, the CMR and the IMR may include control DMRS resources, data DMRS resources, even numbered data REs, even numbered control REs, or a combination thereof.

Additionally or alternatively, the transmitting UE115-gor the transmitting UE115-hmay determine to transmit a trigger for the receiving UE115-fto transmit the indication of the CMR and the IMR. Subsequently, the transmitting UE115-gor the transmitting UE115-hmay transmit, to the receiving UE115-f, the trigger based on the determining. In some implementations, the transmitting UE115-gor the transmitting UE115-hmay determine to transmit the trigger based on a CBR measurement, a number of consecutive transmission failures satisfying a threshold value, or a combination thereof.

At935, the receiving UE115-fmay receive one or more ZP resources from one or more transmitting UEs115of the multiple transmitting UEs115for the CMR, the IMR, or both.

At940, the receiving UE115-fmay receive one or more SDMed transmissions from the multiple transmitting UEs115based on the plurality of sets of transmission parameters.

At945, the receiving UE115-fmay estimate a channel measurement and an interference measurement per TRP for transmissions from the multiple transmitting UEs115on the same set of time and frequency resources based on the indication of the CMR and the IMR, where the transmissions from the multiple transmitting UEs115are received based on the estimating. In some implementations, the estimating of the interference measurement may be based on a measurement of the ZP resource(s)

FIG.10shows a block diagram1000of a device1005that supports unicast coordination for SDM communications in accordance with aspects of the present disclosure. The device1005may be an example of aspects of a UE115as described herein. The device1005may include a receiver1010, a transmitter1015, and a communications manager1020. The device1005may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses).

The receiver1010may 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 unicast coordination for SDM communications). Information may be passed on to other components of the device1005. The receiver1010may utilize a single antenna or a set of multiple antennas.

The transmitter1015may provide a means for transmitting signals generated by other components of the device1005. For example, the transmitter1015may 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 size-based neural network selection for autoencoder-based communication). In some examples, the transmitter1015may be co-located with a receiver1010in a transceiver module. The transmitter1015may utilize a single antenna or a set of multiple antennas.

The communications manager1020, the receiver1010, the transmitter1015, or various combinations thereof or various components thereof may be examples of means for performing various aspects of unicast coordination for SDM communications as described herein.

In some examples, the communications manager1020, the receiver1010, the transmitter1015, or various combinations thereof or components thereof, may be implemented in hardware (e.g., in communications management circuitry). The circuitry 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 designed to perform the functions described in the present disclosure.

Additionally or alternatively, in some examples, the communications manager1020, the receiver1010, the transmitter1015, or various combinations thereof 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 manager1020, the receiver1010, the transmitter1015, or various combinations thereof or components thereof, may be executed 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.

In some examples, the communications manager1020may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the receiver1010, the transmitter1015, or both. For example, the communications manager1020may receive information from the receiver1010, send information to the transmitter1015, or be integrated in combination with the receiver1010, the transmitter1015, or both to receive information, transmit information, or perform various other operations as described herein.

The communications manager1020may support wireless communications at a receiving UE in accordance with examples as disclosed herein. For example, the communications manager1020may be configured to provide or support a means for establishing a set of multiple unicast connections with a set of multiple transmitting UEs, the set of multiple transmitting UEs including one or more first transmitting UEs connected to a first transmission reception point of the receiving UE via respective unicast connections of the set of multiple unicast connections and one or more second transmitting UEs connected to a second transmission reception point of the receiving UE via respective unicast connections of the set of multiple unicast connections. The communications manager1020may be configured to provide or support a means for determining a set of multiple sets of transmission parameters for the set of multiple transmitting UEs, the set of multiple sets of transmission parameters enabling the receiving UE to receive transmissions from the set of multiple transmitting UEs on a same set of time and frequency resources via an SDM scheme. The communications manager1020may be configured to provide or support a means for transmitting each set of transmission parameters from the set of multiple sets of transmission parameters to respective transmitting UEs of the set of multiple transmitting UEs.

Additionally or alternatively, the communications manager1020may support wireless communications at a transmitting UE in accordance with examples as disclosed herein. For example, the communications manager1020may be configured to provide or support a means for transmitting, to a receiving UE, a request to establish a unicast connection with a first transmission reception point of multiple transmission reception points for the receiving UE. The communications manager1020may be configured to provide or support a means for receiving, from the receiving UE, a set of transmission parameters to use for subsequent communications on the unicast connection, the set of transmission parameters enabling the receiving UE to receive transmissions from a set of multiple transmitting UEs including the transmitting UE on a same set of time and frequency resources via an SDM scheme.

By including or configuring the communications manager1020in accordance with examples as described herein, the device1005(e.g., a processor controlling or otherwise coupled to the receiver1010, the transmitter1015, the communications manager1020, or a combination thereof) may support techniques for more efficient utilization of communication resources (e.g., V2X resources) by receiving multiple transmissions from multiple UEs via an SDM scheme based on determined transmission parameters indicated to each of the multiple UEs.

FIG.11shows a block diagram1100of a device1105that supports unicast coordination for SDM communications in accordance with aspects of the present disclosure. The device1105may be an example of aspects of a device1005or a UE115as described herein. The device1105may include a receiver1110, a transmitter1115, and a communications manager1120. The device1105may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses).

The receiver1110may 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 unicast coordination for SDM communications). Information may be passed on to other components of the device1105. The receiver1110may utilize a single antenna or a set of multiple antennas.

The transmitter1115may provide a means for transmitting signals generated by other components of the device1105. For example, the transmitter1115may 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 size-based neural network selection for autoencoder-based communication). In some examples, the transmitter1115may be co-located with a receiver1110in a transceiver module. The transmitter1115may utilize a single antenna or a set of multiple antennas.

The device1105, or various components thereof, may be an example of means for performing various aspects of unicast coordination for SDM communications as described herein. For example, the communications manager1120may include a unicast connection establishment component1125, a transmission parameter determination component1130, a transmission parameter indication component1135, a unicast connection request component1140, a transmission parameter reception component1145, or any combination thereof. The communications manager1120may be an example of aspects of a communications manager1020as described herein. In some examples, the communications manager1120, or various components thereof, may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the receiver1110, the transmitter1115, or both. For example, the communications manager1120may receive information from the receiver1110, send information to the transmitter1115, or be integrated in combination with the receiver1110, the transmitter1115, or both to receive information, transmit information, or perform various other operations as described herein.

The communications manager1120may support wireless communications at a receiving UE in accordance with examples as disclosed herein. The unicast connection establishment component1125may be configured to provide or support a means for establishing a set of multiple unicast connections with a set of multiple transmitting UEs, the set of multiple transmitting UEs including one or more first transmitting UEs connected to a first transmission reception point of the receiving UE via respective unicast connections of the set of multiple unicast connections and one or more second transmitting UEs connected to a second transmission reception point of the receiving UE via respective unicast connections of the set of multiple unicast connections. The transmission parameter determination component1130may be configured to provide or support a means for determining a set of multiple sets of transmission parameters for the set of multiple transmitting UEs, the set of multiple sets of transmission parameters enabling the receiving UE to receive transmissions from the set of multiple transmitting UEs on a same set of time and frequency resources via an SDM scheme. The transmission parameter indication component1135may be configured to provide or support a means for transmitting each set of transmission parameters from the set of multiple sets of transmission parameters to respective transmitting UEs of the set of multiple transmitting UEs.

Additionally or alternatively, the communications manager1120may support wireless communications at a transmitting UE in accordance with examples as disclosed herein. The unicast connection request component1140may be configured to provide or support a means for transmitting, to a receiving UE, a request to establish a unicast connection with a first transmission reception point of multiple transmission reception points for the receiving UE. The transmission parameter reception component1145may be configured to provide or support a means for receiving, from the receiving UE, a set of transmission parameters to use for subsequent communications on the unicast connection, the set of transmission parameters enabling the receiving UE to receive transmissions from a set of multiple transmitting UEs including the transmitting UE on a same set of time and frequency resources via an SDM scheme.

FIG.12shows a block diagram1200of a communications manager1220that supports unicast coordination for SDM communications in accordance with aspects of the present disclosure. The communications manager1220may be an example of aspects of a communications manager1020, a communications manager1120, or both, as described herein. The communications manager1220, or various components thereof, may be an example of means for performing various aspects of unicast coordination for SDM communications as described herein. For example, the communications manager1220may include a unicast connection establishment component1225, a transmission parameter determination component1230, a transmission parameter indication component1235, a unicast connection request component1240, a transmission parameter reception component1245, a DMRS cyclic shift indication component1250, a measurement resource component1255, a DMRS cyclic shift component1260, a measurement resource indication component1265, a measurement resource trigger component1270, a measurement resource triggering component1275, 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 manager1220may support wireless communications at a receiving UE in accordance with examples as disclosed herein. The unicast connection establishment component1225may be configured to provide or support a means for establishing a set of multiple unicast connections with a set of multiple transmitting UEs, the set of multiple transmitting UEs including one or more first transmitting UEs connected to a first transmission reception point of the receiving UE via respective unicast connections of the set of multiple unicast connections and one or more second transmitting UEs connected to a second transmission reception point of the receiving UE via respective unicast connections of the set of multiple unicast connections. The transmission parameter determination component1230may be configured to provide or support a means for determining a set of multiple sets of transmission parameters for the set of multiple transmitting UEs, the set of multiple sets of transmission parameters enabling the receiving UE to receive transmissions from the set of multiple transmitting UEs on a same set of time and frequency resources via an SDM scheme. The transmission parameter indication component1235may be configured to provide or support a means for transmitting each set of transmission parameters from the set of multiple sets of transmission parameters to respective transmitting UEs of the set of multiple transmitting UEs.

In some examples, to support transmitting each set of transmission parameters to the respective transmitting UEs, the transmission parameter indication component1235may be configured to provide or support a means for transmitting each set of transmission parameters via a sidelink control information message to the respective transmitting UEs.

In some examples, each set of transmission parameters is indicated via a resource bit map in the sidelink control information message.

In some examples, the sidelink control information message includes a second stage sidelink control information message.

In some examples, the DMRS cyclic shift indication component1250may be configured to provide or support a means for transmitting, to the respective transmitting UEs, an indication for a control demodulation reference signal cyclic shift for each transmitting UE to use when transmitting communications to the receiving UE, where the control demodulation reference signal cyclic shift further enables the receiving UE to receive the transmissions from the set of multiple transmitting UEs on the same set of time and frequency resources via the SDM scheme.

In some examples, to support transmitting the indication for the control demodulation reference signal cyclic shift, the DMRS cyclic shift indication component1250may be configured to provide or support a means for transmitting the indication for the control demodulation reference signal cyclic shift to the respective transmitting UEs via a sidelink control information message.

In some examples, the sidelink control information message includes a second stage sidelink control information message for UE coordination.

In some examples, the measurement resource component1255may be configured to provide or support a means for transmitting, to the respective transmitting UEs, an indication of a channel measurement resource and an interference measurement resource. In some examples, the measurement resource component1255may be configured to provide or support a means for estimating a channel measurement and an interference measurement per transmission reception point for transmissions from the set of multiple transmitting UEs on the same set of time and frequency resources based on the indication of the channel measurement resource and the interference measurement resource, where the transmissions from the set of multiple transmitting UEs are received based on the estimating.

In some examples, to support transmitting the indication of the channel measurement resource and the interference measurement resource, the measurement resource indication component1265may be configured to provide or support a means for transmitting the indication of the channel measurement resource and the interference measurement resource to each transmitting UE via a sidelink control information message.

In some examples, the sidelink control information message includes a second stage sidelink control information message for UE coordination.

In some examples, the measurement resource component1255may be configured to provide or support a means for receiving a zero power resource from one or more transmitting UEs of the set of multiple transmitting UEs for the channel measurement resource, the interference measurement resource, or both, where the estimating the interference measurement is based on a measurement of the zero power resource.

In some examples, the measurement resource trigger component1270may be configured to provide or support a means for determining to transmit the indication of the channel measurement resource and the interference measurement resource based on a trigger.

In some examples, the trigger includes a resource reservation information message decoded based on the SDM scheme, a channel busy ratio measurement, receiving an indication to trigger the channel measurement resource and the interference measurement resource from one or more transmitting UEs from the set of multiple transmitting UEs, or a combination thereof.

In some examples, the channel measurement resource and the interference measurement resource are part of a channel state information reference signal configuration.

In some examples, the channel measurement resource and the interference measurement resource include control demodulation reference signal resources, data demodulation reference signal resources, even numbered data resource elements, even numbered control resource elements, or a combination thereof.

In some examples, the unicast connection establishment component1225may be configured to provide or support a means for selecting the set of multiple transmitting UEs for establishing the set of multiple unicast connections based on detecting a sidelink control information message from each of the set of multiple transmitting UEs, performing a signal quality measurement among the first transmission reception point and the second transmission reception point of the receiving UE for each transmitting UE, or a combination thereof.

In some examples, to support determining the set of multiple sets of transmission parameters, the transmission parameter determination component1230may be configured to provide or support a means for determining the set of multiple sets of transmission parameters for the respective transmitting UEs of the set of multiple transmitting UEs based on which transmission reception point of the receiving UE is used for a respective unicast connection with a transmitting UE of the set of multiple transmitting UEs.

In some examples, a same set of transmission parameters is used for a first transmitting UE and for a second transmitting UE of the set of multiple transmitting UEs based on the a first unicast connection being established between the first transmitting UE and the receiving UE via the first transmission reception point and a second unicast connection being established between the second transmitting UE and the receiving UE via the second transmission reception point.

In some examples, to support determining the set of multiple sets of transmission parameters, the transmission parameter determination component1230may be configured to provide or support a means for determining the set of multiple sets of transmission parameters based on one or more signal quality measurements of the set of multiple unicast connections.

In some examples, the one or more signal quality measurements include a reference signal strength indicator measurement, a reference signal received power measurement, biased information for each of the set of multiple transmitting UEs, or a combination thereof.

In some examples, each set of transmission parameters includes a transmission schedule adjustment, a transmit power, a transmit time, an indication of the time and frequency resources, or a combination thereof.

Additionally or alternatively, the communications manager1220may support wireless communications at a transmitting UE in accordance with examples as disclosed herein. The unicast connection request component1240may be configured to provide or support a means for transmitting, to a receiving UE, a request to establish a unicast connection with a first transmission reception point of multiple transmission reception points for the receiving UE. The transmission parameter reception component1245may be configured to provide or support a means for receiving, from the receiving UE, a set of transmission parameters to use for subsequent communications on the unicast connection, the set of transmission parameters enabling the receiving UE to receive transmissions from a set of multiple transmitting UEs including the transmitting UE on a same set of time and frequency resources via an SDM scheme.

In some examples, to support receiving the set of transmission parameters, the transmission parameter reception component1245may be configured to provide or support a means for receiving, from the receiving UE, the set of transmission parameters via a sidelink control information message.

In some examples, the set of transmission parameters is indicated via a resource bit map in the sidelink control information message.

In some examples, the sidelink control information message includes a second stage sidelink control information message.

In some examples, the DMRS cyclic shift component1260may be configured to provide or support a means for receiving, from the receiving UE, an indication for a control demodulation reference signal cyclic shift to use for the subsequent communications, where the control demodulation reference signal cyclic shift further enables the receiving UE to receive the transmissions from the set of multiple transmitting UEs on the same set of time and frequency resources via the SDM scheme.

In some examples, to support receiving the indication for the control demodulation reference signal cyclic shift, the DMRS cyclic shift component1260may be configured to provide or support a means for receiving, from the receiving UE, the indication for the control demodulation reference signal cyclic shift via a sidelink control information message.

In some examples, the sidelink control information message includes a second stage sidelink control information message for UE coordination.

In some examples, the measurement resource component1255may be configured to provide or support a means for receiving, from the receiving UE, an indication of a channel measurement resource and an interference measurement resource for the subsequent communications.

In some examples, to support receiving the indication of the channel measurement resource and the interference measurement resource, the measurement resource component1255may be configured to provide or support a means for receiving, from the receiving UE, the indication of the channel measurement resource and the interference measurement resource via a sidelink control information message.

In some examples, the sidelink control information message includes a second stage sidelink control information message for UE coordination.

In some examples, the measurement resource component1255may be configured to provide or support a means for transmitting, to the receiving UE, a zero power resource using the channel measurement resource, the interference measurement resource, or both.

In some examples, the measurement resource triggering component1275may be configured to provide or support a means for determining to transmit a trigger for the receiving UE to transmit the indication of the channel measurement resource and the interference measurement resource.

In some examples, to support determining to transmit the trigger, the measurement resource triggering component1275may be configured to provide or support a means for determining to transmit the trigger based on a channel busy ratio measurement, a number of consecutive transmission failures satisfying a threshold value, or a combination thereof.

In some examples, the channel measurement resource and the interference measurement resource are part of a channel state information reference signal configuration.

In some examples, the channel measurement resource and the interference measurement resource include control demodulation reference signal resources, data demodulation reference signal resources, even numbered data resource elements, even numbered control resource elements, or a combination thereof.

In some examples, the set of transmission parameters includes a transmission schedule adjustment, a transmit power, a transmit time, an indication of the time and frequency resources, or a combination thereof.

FIG.13shows a diagram of a system1300including a device1305that supports unicast coordination for SDM communications in accordance with aspects of the present disclosure. The device1305may be an example of or include the components of a device1005, a device1105, or a UE115as described herein. The device1305may communicate wirelessly with one or more base stations105, UEs115, or any combination thereof. The device1305may include components for bi-directional voice and data communications including components for transmitting and receiving communications, including a communications manager1310, an I/O controller1315, a transceiver1320, an antenna1325, a memory1330, code1335, and a processor1340. 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 bus1345).

The I/O controller1315may manage input and output signals for the device1305. The I/O controller1315may also manage peripherals not integrated into the device1305. In some cases, the I/O controller1315may represent a physical connection or port to an external peripheral. In some cases, the I/O controller1315may utilize an operating system such as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS/2®, UNIX®, LINUX®, or another known operating system. In some other cases, the I/O controller1315may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device. In some cases, the I/O controller1315may be implemented as part of a processor, such as the processor1340. In some cases, a user may interact with the device1305via the I/O controller1315or via hardware components controlled by the I/O controller1315.

In some cases, the device1305may include a single antenna1325. However, in some other cases the device1305may have more than one antenna1325, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The transceiver1320may communicate bi-directionally, via the one or more antennas1325, wired, or wireless links as described herein. For example, the transceiver1320may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver1320may also include a modem to modulate the packets and provide the modulated packets to one or more antennas1325for transmission, and to demodulate packets received from the one or more antennas1325. The transceiver1320, or the transceiver1320and one or more antennas1325, may be an example of a transmitter1015, a transmitter1115, a receiver1010, a receiver1110, or any combination thereof or component thereof, as described herein.

The memory1330may include random access memory (RAM) and read-only memory (ROM). The memory1330may store computer-readable, computer-executable code1335including instructions that, when executed by the processor1340, cause the device1305to perform various functions described herein. The code1335may be stored in a non-transitory computer-readable medium such as system memory or other type of memory. In some cases, the code1335may not be directly executable by the processor1340but may cause a computer (e.g., when compiled and executed) to perform functions described herein. In some cases, the memory1330may 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 processor1340may 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 processor1340may be configured to operate a memory array using a memory controller. In some other cases, a memory controller may be integrated into the processor1340. The processor1340may be configured to execute computer-readable instructions stored in a memory (e.g., the memory1330) to cause the device1305to perform various functions (e.g., functions or tasks supporting unicast coordination for SDM communications). For example, the device1305or a component of the device1305may include a processor1340and memory1330coupled to the processor1340, the processor1340and memory1330configured to perform various functions described herein.

The communications manager1310may support wireless communications at a receiving UE in accordance with examples as disclosed herein. For example, the communications manager1310may be configured to provide or support a means for establishing a set of multiple unicast connections with a set of multiple transmitting UEs, the set of multiple transmitting UEs including one or more first transmitting UEs connected to a first transmission reception point of the receiving UE via respective unicast connections of the set of multiple unicast connections and one or more second transmitting UEs connected to a second transmission reception point of the receiving UE via respective unicast connections of the set of multiple unicast connections. The communications manager1310may be configured to provide or support a means for determining a set of multiple sets of transmission parameters for the set of multiple transmitting UEs, the set of multiple sets of transmission parameters enabling the receiving UE to receive transmissions from the set of multiple transmitting UEs on a same set of time and frequency resources via an SDM scheme. The communications manager1310may be configured to provide or support a means for transmitting each set of transmission parameters from the set of multiple sets of transmission parameters to respective transmitting UEs of the set of multiple transmitting UEs.

Additionally or alternatively, the communications manager1310may support wireless communications at a transmitting UE in accordance with examples as disclosed herein. For example, the communications manager1310may be configured to provide or support a means for transmitting, to a receiving UE, a request to establish a unicast connection with a first transmission reception point of multiple transmission reception points for the receiving UE. The communications manager1310may be configured to provide or support a means for receiving, from the receiving UE, a set of transmission parameters to use for subsequent communications on the unicast connection, the set of transmission parameters enabling the receiving UE to receive transmissions from a set of multiple transmitting UEs including the transmitting UE on a same set of time and frequency resources via an SDM scheme.

By including or configuring the communications manager1310in accordance with examples as described herein, the device1305may support techniques for improved communication reliability, more efficient utilization of communication resources, and improved coordination between devices. For example, the determined sets of transmission parameters may enable multiple transmitting UEs to use a same set of time and frequency resources (e.g., more efficient use of communication resources) when transmitting messages to the receiving UE, where the receiving UE receives the messages according to an SDM scheme based on the sets of transmission parameters. Additionally, the determined sets of transmission parameters may decrease chances that the messages interfere with each other, thereby improving reliability.

In some examples, the communications manager1310may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the transceiver1320, the one or more antennas1325, or any combination thereof. Although the communications manager1310is illustrated as a separate component, in some examples, one or more functions described with reference to the communications manager1310may be supported by or performed by the processor1340, the memory1330, the code1335, or any combination thereof. For example, the code1335may include instructions executable by the processor1340to cause the device1305to perform various aspects of unicast coordination for SDM communications as described herein, or the processor1340and the memory1330may be otherwise configured to perform or support such operations.

FIG.14shows a flowchart illustrating a method1400that supports unicast coordination for SDM communications in accordance with aspects of the present disclosure. The operations of the method1400may be implemented by a receiving UE or its components as described herein. For example, the operations of the method1400may be performed by a receiving UE115as described with reference toFIGS.1through13. 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.

At1405, the method may include establishing a set of multiple unicast connections with a set of multiple transmitting UEs, the set of multiple transmitting UEs including one or more first transmitting UEs connected to a first transmission reception point of the receiving UE via respective unicast connections of the set of multiple unicast connections and one or more second transmitting UEs connected to a second transmission reception point of the receiving UE via respective unicast connections of the set of multiple unicast connections. The operations of1405may be performed according to the methods described herein. In some examples, aspects of the operations of1405may be performed by a unicast connection establishment component1225as described with reference toFIG.12.

At1410, the method may include determining a set of multiple sets of transmission parameters for the set of multiple transmitting UEs, the set of multiple sets of transmission parameters enabling the receiving UE to receive transmissions from the set of multiple transmitting UEs on a same set of time and frequency resources via an SDM scheme. The operations of1410may be performed according to the methods described herein. In some examples, aspects of the operations of1410may be performed by a transmission parameter determination component1230as described with reference toFIG.12.

At1415, the method may include transmitting each set of transmission parameters from the set of multiple sets of transmission parameters to respective transmitting UEs of the set of multiple transmitting UEs. The operations of1415may be performed according to the methods described herein. In some examples, aspects of the operations of1415may be performed by a transmission parameter indication component1235as described with reference toFIG.12.

FIG.15shows a flowchart illustrating a method1500that supports unicast coordination for SDM communications in accordance with aspects of the present disclosure. The operations of the method1500may be implemented by a receiving UE or its components as described herein. For example, the operations of the method1500may be performed by a receiving UE115as described with reference toFIGS.1through13. 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.

At1505, the method may include establishing a set of multiple unicast connections with a set of multiple transmitting UEs, the set of multiple transmitting UEs including one or more first transmitting UEs connected to a first transmission reception point of the receiving UE via respective unicast connections of the set of multiple unicast connections and one or more second transmitting UEs connected to a second transmission reception point of the receiving UE via respective unicast connections of the set of multiple unicast connections. The operations of1505may be performed according to the methods described herein. In some examples, aspects of the operations of1505may be performed by a unicast connection establishment component1225as described with reference toFIG.12.

At1510, the method may include determining a set of multiple sets of transmission parameters for the set of multiple transmitting UEs, the set of multiple sets of transmission parameters enabling the receiving UE to receive transmissions from the set of multiple transmitting UEs on a same set of time and frequency resources via an SDM scheme. The operations of1510may be performed according to the methods described herein. In some examples, aspects of the operations of1510may be performed by a transmission parameter determination component1230as described with reference toFIG.12.

At1515, the method may include transmitting each set of transmission parameters from the set of multiple sets of transmission parameters to respective transmitting UEs of the set of multiple transmitting UEs. The operations of1515may be performed according to the methods described herein. In some examples, aspects of the operations of1515may be performed by a transmission parameter indication component1235as described with reference toFIG.12.

At1520, the method may include transmitting each set of transmission parameters via a sidelink control information message to the respective transmitting UEs. The operations of1520may be performed according to the methods described herein. In some examples, aspects of the operations of1520may be performed by a transmission parameter indication component1235as described with reference toFIG.12.

FIG.16shows a flowchart illustrating a method1600that supports unicast coordination for SDM communications in accordance with aspects of the present disclosure. The operations of the method1600may be implemented by a receiving UE or its components as described herein. For example, the operations of the method1600may be performed by a receiving UE115as described with reference toFIGS.1through13. 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.

At1605, the method may include establishing a set of multiple unicast connections with a set of multiple transmitting UEs, the set of multiple transmitting UEs including one or more first transmitting UEs connected to a first transmission reception point of the receiving UE via respective unicast connections of the set of multiple unicast connections and one or more second transmitting UEs connected to a second transmission reception point of the receiving UE via respective unicast connections of the set of multiple unicast connections. The operations of1605may be performed according to the methods described herein. In some examples, aspects of the operations of1605may be performed by a unicast connection establishment component1225as described with reference toFIG.12.

At1610, the method may include determining a set of multiple sets of transmission parameters for the set of multiple transmitting UEs, the set of multiple sets of transmission parameters enabling the receiving UE to receive transmissions from the set of multiple transmitting UEs on a same set of time and frequency resources via an SDM scheme. The operations of1610may be performed according to the methods described herein. In some examples, aspects of the operations of1610may be performed by a transmission parameter determination component1230as described with reference toFIG.12.

At1615, the method may include transmitting each set of transmission parameters from the set of multiple sets of transmission parameters to respective transmitting UEs of the set of multiple transmitting UEs. The operations of1615may be performed according to the methods described herein. In some examples, aspects of the operations of1615may be performed by a transmission parameter indication component1235as described with reference toFIG.12.

At1620, the method may include transmitting, to the respective transmitting UEs, an indication for a control demodulation reference signal cyclic shift for each transmitting UE to use when transmitting communications to the receiving UE, where the control demodulation reference signal cyclic shift further enables the receiving UE to receive the transmissions from the set of multiple transmitting UEs on the same set of time and frequency resources via the SDM scheme. The operations of1620may be performed according to the methods described herein. In some examples, aspects of the operations of1620may be performed by an DMRS cyclic shift indication component1250as described with reference toFIG.12.

FIG.17shows a flowchart illustrating a method1700that supports unicast coordination for SDM communications in accordance with aspects of the present disclosure. The operations of the method1700may be implemented by a receiving UE or its components as described herein. For example, the operations of the method1700may be performed by a receiving UE115as described with reference toFIGS.1through13. 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.

At1705, the method may include establishing a set of multiple unicast connections with a set of multiple transmitting UEs, the set of multiple transmitting UEs including one or more first transmitting UEs connected to a first transmission reception point of the receiving UE via respective unicast connections of the set of multiple unicast connections and one or more second transmitting UEs connected to a second transmission reception point of the receiving UE via respective unicast connections of the set of multiple unicast connections. The operations of1705may be performed according to the methods described herein. In some examples, aspects of the operations of1705may be performed by a unicast connection establishment component1225as described with reference toFIG.12.

At1710, the method may include determining a set of multiple sets of transmission parameters for the set of multiple transmitting UEs, the set of multiple sets of transmission parameters enabling the receiving UE to receive transmissions from the set of multiple transmitting UEs on a same set of time and frequency resources via an SDM scheme. The operations of1710may be performed according to the methods described herein. In some examples, aspects of the operations of1710may be performed by a transmission parameter determination component1230as described with reference toFIG.12.

At1715, the method may include transmitting each set of transmission parameters from the set of multiple sets of transmission parameters to respective transmitting UEs of the set of multiple transmitting UEs. The operations of1715may be performed according to the methods described herein. In some examples, aspects of the operations of1715may be performed by a transmission parameter indication component1235as described with reference toFIG.12.

At1720, the method may include transmitting, to the respective transmitting UEs, an indication of a channel measurement resource and an interference measurement resource. The operations of1720may be performed according to the methods described herein. In some examples, aspects of the operations of1720may be performed by a measurement resource component1255as described with reference toFIG.12.

At1725, the method may include estimating a channel measurement and an interference measurement per transmission reception point for transmissions from the set of multiple transmitting UEs on the same set of time and frequency resources based on the indication of the channel measurement resource and the interference measurement resource, where the transmissions from the set of multiple transmitting UEs are received based on the estimating. The operations of1725may be performed according to the methods described herein. In some examples, aspects of the operations of1725may be performed by a measurement resource component1255as described with reference toFIG.12.

FIG.18shows a flowchart illustrating a method1800that supports unicast coordination for SDM communications in accordance with aspects of the present disclosure. The operations of the method1800may be implemented by a transmitting UE or its components as described herein. For example, the operations of the method1800may be performed by a transmitting UE115as described with reference toFIGS.1through13. 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.

At1805, the method may include transmitting, to a receiving UE, a request to establish a unicast connection with a first transmission reception point of multiple transmission reception points for the receiving UE. The operations of1805may be performed according to the methods described herein. In some examples, aspects of the operations of1805may be performed by a unicast connection request component1240as described with reference toFIG.12.

At1810, the method may include receiving, from the receiving UE, a set of transmission parameters to use for subsequent communications on the unicast connection, the set of transmission parameters enabling the receiving UE to receive transmissions from a set of multiple transmitting UEs including the transmitting UE on a same set of time and frequency resources via an SDM scheme. The operations of1810may be performed according to the methods described herein. In some examples, aspects of the operations of1810may be performed by a transmission parameter reception component1245as described with reference toFIG.12.

FIG.19shows a flowchart illustrating a method1900that supports unicast coordination for SDM communications in accordance with aspects of the present disclosure. The operations of the method1900may be implemented by a transmitting UE or its components as described herein. For example, the operations of the method1900may be performed by a transmitting UE115as described with reference toFIGS.1through13. 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.

At1905, the method may include transmitting, to a receiving UE, a request to establish a unicast connection with a first transmission reception point of multiple transmission reception points for the receiving UE. The operations of1905may be performed according to the methods described herein. In some examples, aspects of the operations of1905may be performed by a unicast connection request component1240as described with reference toFIG.12.

At1910, the method may include receiving, from the receiving UE, a set of transmission parameters to use for subsequent communications on the unicast connection, the set of transmission parameters enabling the receiving UE to receive transmissions from a set of multiple transmitting UEs including the transmitting UE on a same set of time and frequency resources via an SDM scheme. The operations of1910may be performed according to the methods described herein. In some examples, aspects of the operations of1910may be performed by a transmission parameter reception component1245as described with reference toFIG.12.

At1915, the method may include receiving, from the receiving UE, the set of transmission parameters via a sidelink control information message. The operations of1915may be performed according to the methods described herein. In some examples, aspects of the operations of1915may be performed by a transmission parameter reception component1245as described with reference toFIG.12.

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 random-access memory (RAM), read-only memory (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.”

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.