Unicast coordination for space-division multiplexing communications

Abstract

Methods, systems, and apparatus for wireless communications are described. A first user equipment (UE) may establish multiple unicast connections with multiple other UEs. The first UE may then determine an individual set of transmission parameters for each of the multiple other UEs, wherein the individual set of transmission parameters may enable the first UE to receive transmissions from the multiple other UEs on the same set of time-frequency resources via a space division multiplexing scheme. For example, each of the individual sets of transmission parameters may include a transmission scheduling adjustment, a transmit power, a transmit time, an indication of a time-frequency resource, or a combination thereof. The first UE may then transmit each of the individual sets of transmission parameters to a corresponding UE in the multiple other UEs.

Description

Technical Field

[0001] The following relates to wireless communications, including unicast coordination for spatial division multiplexing (SDM) communications.

[0002] background

[0003] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcast, etc. These systems may be able to support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems (such as long term evolution (LTE) systems, advanced LTE (LTE-A) systems, or LTE-A Pro systems), and fifth generation (5G) systems, which may be referred to as new radio (NR) systems. These systems may employ various technologies, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM).

[0004] A wireless multiple access communication system may include one or more base stations or one or more network access nodes, each base station or network access node simultaneously supporting communication of multiple communication devices, which may be further referred to as user equipment (UE). In addition, a first UE may communicate with multiple other UEs via side link communication on one or more unicast links. However, as the number of UEs communicating with the first UE increases, pressure may be placed on the resources available for side link communication. An efficient technology for implementing side link communication between a UE and multiple other UEs on a corresponding unicast link is desired.

[0005] Overview

[0006] The described technology relates to improved methods, systems, devices and apparatuses for supporting unicast coordination for space division multiplexing (SDM) communications. In general, the described technology provides a first user equipment (UE) (e.g., a receiving UE) to establish multiple unicast connections (e.g., links) with multiple other UEs (e.g., transmitting UEs), wherein a first set of the other multiple UEs communicates with a first transmit reception point (TRP) of the first UE, and a second set of the other multiple UEs communicates with a second TRP of the first UE. Accordingly, the first UE can determine an individual set of transmission parameters for each of the multiple other UEs, wherein the individual set of transmission parameters can enable the first UE to receive transmissions from the multiple other UEs on the same set of time-frequency resources via an SDM scheme. For example, each set of the individual transmission parameter sets may include a transmission scheduling adjustment, a transmit power, a transmit time, an indication of a time-frequency resource, or a combination thereof. The first UE can then transmit each set of the individual transmission parameter sets to a corresponding UE in the multiple other UEs. In some implementations, the first UE may transmit each individual set of transmission parameters to a corresponding UE via a sidelink control information (SCI) message (eg, a second stage SCI message).

[0007] In some implementations, the first UE may transmit a control demodulation reference signal (DMRS) cyclic shift to each of the multiple other UEs to further enable the first UE to receive transmissions from the multiple other UEs via an SDM scheme. Additionally or alternatively, the first UE may transmit an indication of a channel measurement resource (CMR), an interference measurement resource (IMR), or both to enable the first UE to estimate channel measurements with each of the multiple other UEs, and further enable the first UE to receive transmissions from the multiple other UEs via an SDM scheme. The first UE may transmit a control DMRS cyclic shift, an indication of a CMR, an indication of an IMR, or a combination thereof via an SCI message. In addition, in some implementations, based on the different TRPs used by the first UE to communicate with the multiple other UEs, the first UE may determine an individual parameter set for each TRP. In this way, the first UE can use the same set of transmission parameters for communication with the UE via the first TRP and for communication with different UEs via the second TRP.

[0008] A method for wireless communication at a receiving UE is described. The method may include: establishing multiple unicast connections with multiple transmitting UEs, the multiple transmitting UEs including one or more first transmitting UEs connected to a first TRP of the receiving UE via corresponding unicast connections in the multiple unicast connections, and one or more second transmitting UEs connected to a second TRP of the receiving UE via corresponding unicast connections in the multiple unicast connections; determining multiple transmission parameter sets for the multiple transmitting UEs, the multiple transmission parameter sets enabling the receiving UE to receive transmissions from the multiple transmitting UEs on the same set of time-frequency resources via an SDM scheme; and transmitting each transmission parameter set in the multiple transmission parameter sets to a corresponding transmitting UE in the multiple transmitting UEs.

[0009] A device for wireless communication at a receiving UE is described. The device may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the device to: establish multiple unicast connections with multiple transmitting UEs, the multiple transmitting UEs including one or more first transmitting UEs connected to a first TRP of the receiving UE via corresponding unicast connections in the multiple unicast connections, and one or more second transmitting UEs connected to a second TRP of the receiving UE via corresponding unicast connections in the multiple unicast connections; determine multiple transmission parameter sets for the multiple transmitting UEs, the multiple transmission parameter sets enable the receiving UE to receive transmissions from the multiple transmitting UEs on the same set of time-frequency resources via an SDM scheme; and transmit each of the multiple transmission parameter sets to a corresponding transmitting UE in the multiple transmitting UEs.

[0010] Another apparatus for wireless communication at a receiving UE is described. The apparatus may include: a device for establishing multiple unicast connections with multiple transmitting UEs, the multiple transmitting UEs including one or more first transmitting UEs connected to a first TRP of the receiving UE via corresponding unicast connections in the multiple unicast connections, and one or more second transmitting UEs connected to a second TRP of the receiving UE via corresponding unicast connections in the multiple unicast connections; a device for determining multiple transmission parameter sets for the multiple transmitting UEs, the multiple transmission parameter sets enabling the receiving UE to receive transmissions from the multiple transmitting UEs on the same set of time-frequency resources via an SDM scheme; and a device for transmitting each of the multiple transmission parameter sets to a corresponding transmitting UE in the multiple transmitting UEs.

[0011] A non-transitory computer-readable medium storing code for wireless communication at a receiving UE is described. The code may include instructions executable by a processor for the following operations: establishing multiple unicast connections with multiple transmitting UEs, the multiple transmitting UEs including one or more first transmitting UEs connected to a first TRP of the receiving UE via corresponding unicast connections in the multiple unicast connections, and one or more second transmitting UEs connected to a second TRP of the receiving UE via corresponding unicast connections in the multiple unicast connections; determining multiple transmission parameter sets for the multiple transmitting UEs, the multiple transmission parameter sets enabling the receiving UE to receive transmissions from the multiple transmitting UEs on the same set of time-frequency resources via an SDM scheme; and transmitting each of the multiple transmission parameter sets to a corresponding transmitting UE in the multiple transmitting UEs.

[0012] In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, each transmission parameter set is transmitted to a corresponding transmitting UE via an SCI message.

[0013] In some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein, each transmission parameter set may be indicated via a resource bitmap in an SCI message.

[0014] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the SCI message may include a second stage SCI message.

[0015] Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for the following actions: transmitting an indication of controlling DMRS cyclic shift to the corresponding transmitting UE for use by each transmitting UE when transmitting communications to the receiving UE, wherein the controlling DMRS cyclic shift further enables the receiving UE to receive transmissions from the multiple transmitting UEs on the same set of time-frequency resources via the SDM scheme.

[0016] In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, an indication to control DMRS cyclic shift is transmitted to a corresponding transmitting UE via an SCI message.

[0017] In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, the SCI message includes a second stage SCI message for UE coordination.

[0018] Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, apparatuses, or instructions for: transmitting indications of CMR and IMR to corresponding transmitting UEs; and estimating channel measurements and interference measurements per TRP for transmissions from the multiple transmitting UEs on the same set of time-frequency resources based on the indications of CMR and IMR, wherein the transmissions from the multiple transmitting UEs are received based on the estimation.

[0019] In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, an indication of the CMR and IMR is transmitted to each transmitting UE via an SCI message.

[0020] In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, the SCI message includes a second stage SCI message for UE coordination.

[0021] Some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein may further include operations, features, apparatuses, or instructions for the following actions: receiving zero-power resources for CMR, IMR, or both from one or more transmitting UEs of the multiple transmitting UEs, wherein estimating the interference measurement may be based on a measurement of the zero-power resources.

[0022] Some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for determining, based on a trigger, to transmit an indication of a CMR and an IMR.

[0023] In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, the trigger includes a resource reservation information message decoded based on an SDM scheme, a channel busy rate (CBR) measurement, receiving an indication from one or more of the multiple transmitting UEs to trigger CMR and IMR, or a combination thereof.

[0024] In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, the CMR and IMR may be part of a channel state information (CSI) reference signal (RS) configuration.

[0025] In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, CMRs and IMRs include control DMRS resources, data DMRS resources, even-numbered data resource elements (REs), even-numbered control REs, or a combination thereof.

[0026] Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, apparatuses, or instructions for the following actions: selecting the multiple transmitting UEs to establish the multiple unicast connections based on detecting an SCI message from each of the multiple transmitting UEs, performing signal quality measurements for each transmitting UE within the first TRP and the second TRP of the receiving UE, or a combination thereof.

[0027] In some examples of the methods, apparatus (devices) and non-transitory computer-readable media described herein, the multiple transmission parameter sets for corresponding transmitting UEs among the multiple transmitting UEs are determined based on which TRP of the receiving UE can be used for the corresponding unicast connection with the transmitting UE among the multiple transmitting UEs.

[0028] In some examples of the methods, apparatuses (devices) and non-transitory computer-readable media described herein, based on establishing a first unicast connection between a first transmitting UE and a receiving UE via a first TRP and establishing a second unicast connection between a second transmitting UE and the receiving UE via a second TRP, the same set of transmission parameters may be used for a first transmitting UE and a second transmitting UE among the multiple transmitting UEs.

[0029] In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, the plurality of transmission parameter sets are determined based on one or more signal quality measurements of the plurality of unicast connections.

[0030] In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, the one or more signal quality measurements include a reference signal strength indicator (RSSI) measurement, a reference signal received power (RSRP) measurement, bias information for each of the multiple transmitting UEs, or a combination thereof.

[0031] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, each set of transmission parameters includes a transmission scheduling adjustment, a transmit power, a transmit time, an indication of time-frequency resources, or a combination thereof.

[0032] A method for wireless communication at a transmitting UE is described. The method may include: transmitting to a receiving UE a request to establish a unicast connection with a first TRP among a plurality of TRPs of the receiving UE; and receiving from the receiving UE a set of transmission parameters to be used for subsequent communication on the unicast connection, the set of transmission parameters enabling the receiving UE to receive transmissions from a plurality of transmitting UEs including the transmitting UE on the same set of time-frequency resources via an SDM scheme.

[0033] A device for wireless communication at a transmitting UE is described. The device may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the device to: transmit a request to a receiving UE to establish a unicast connection with a first TRP among multiple TRPs of the receiving UE; and receive a set of transmission parameters to be used for subsequent communications on the unicast connection from the receiving UE, the set of transmission parameters enabling the receiving UE to receive transmissions from multiple transmitting UEs including the transmitting UE on the same set of time-frequency resources via an SDM scheme.

[0034] Another apparatus for wireless communication at a transmitting UE is described. The apparatus may include: a device for transmitting to a receiving UE a request to establish a unicast connection with a first TRP of a plurality of TRPs of the receiving UE; and a device for receiving from the receiving UE a set of transmission parameters to be used for subsequent communications on the unicast connection, the set of transmission parameters enabling the receiving UE to receive transmissions from a plurality of transmitting UEs including the transmitting UE on the same set of time-frequency resources via an SDM scheme.

[0035] A non-transitory computer-readable medium storing code for wireless communication at a transmitting UE is described. The code may include instructions executable by a processor for the following operations: transmitting a request to a receiving UE to establish a unicast connection with a first TRP of a plurality of TRPs of the receiving UE; and receiving a set of transmission parameters for subsequent communication on the unicast connection from the receiving UE, the set of transmission parameters enabling the receiving UE to receive transmissions from a plurality of transmitting UEs including the transmitting UE on the same set of time-frequency resources via an SDM scheme.

[0036] In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, the set of transmission parameters is received from the recipient UE via an SCI message.

[0037] In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, the set of transmission parameters may be indicated via a resource bitmap in an SCI message.

[0038] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the SCI message includes a second stage SCI message.

[0039] Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, apparatuses, or instructions for the following actions: receiving an indication of a control DMRS cyclic shift to be used for subsequent communications from the receiving UE, wherein the control DMRS cyclic shift further enables the receiving UE to receive transmissions from the multiple transmitting UEs on the same set of time-frequency resources via the SDM scheme.

[0040] In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, an indication to control DMRS cyclic shift is received from the receiving UE via an SCI message.

[0041] In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, the SCI message includes a second stage SCI message for UE coordination.

[0042] Some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for receiving, from the recipient UE, an indication of the CMR and IMR for subsequent communications.

[0043] In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, an indication of the CMR and IMR is received from the recipient UE via an SCI message.

[0044] In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, the SCI message includes a second stage SCI message for UE coordination.

[0045] Some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for transmitting zero-power resources to the receiving UE using CMR, IMR, or both.

[0046] Some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for determining to transmit a trigger to cause the receiving UE to transmit an indication of the CMR and IMR.

[0047] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the trigger is determined to be transmitted based on a CBR measurement, a number of consecutive transmission failures satisfying a threshold, or a combination thereof.

[0048] In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, CMR and IMR may be part of a CSI-RS configuration.

[0049] In some examples of the methods, apparatuses (devices), and non-transitory computer-readable media described herein, CMRs and IMRs include control DMRS resources, data DMRS resources, even-numbered data REs, even-numbered control REs, or a combination thereof.

[0050] In some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein, the set of transmission parameters includes a transmission scheduling adjustment, a transmit power, a transmit time, an indication of time-frequency resources, or a combination thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1

[0013] An example of a wireless communication system supporting unicast coordination for spatial division multiplexing (SDM) communications in accordance with aspects of the present disclosure is illustrated.

[0053] Figure 2

[0013] An example of a wireless communication system supporting unicast coordination for SDM communications in accordance with aspects of the present disclosure is illustrated.

[0054] Figure 3A , 3B , 3C, and 3D illustrate examples of broadcast types according to aspects of the present disclosure.

[0055] Figure 4 An example of link establishment according to aspects of the present disclosure is illustrated.

[0056] Figure 5 Examples of physical channel structures in accordance with aspects of the present disclosure are illustrated.

[0057] Figure 6 and 7 An example of unicast setup supporting unicast coordination for SDM communications in accordance with aspects of the present disclosure is illustrated.

[0058] Figure 8 An example of a resource mode supporting unicast coordination for SDM communications in accordance with aspects of the present disclosure is illustrated.

[0059] Fig. 9 An example of a process flow supporting unicast coordination for SDM communications in accordance with aspects of the present disclosure is illustrated.

[0060] Fig.10 and 11 A block diagram of an apparatus supporting unicast coordination for SDM communications in accordance with aspects of the present disclosure is shown.

[0061] Fig.12 A block diagram of a communications manager supporting unicast coordination for SDM communications in accordance with aspects of the present disclosure is shown.

[0062] Fig.13 A diagram of a system including devices supporting unicast coordination for SDM communications is shown in accordance with aspects of the present disclosure.

[0063] Figures 14 to 19 A flow chart illustrating a method of supporting unicast coordination for SDM communications in accordance with aspects of the present disclosure is shown.

[0064] Detailed Description

[0065] For vehicle-to-everything (V2X) communications, two or more vehicles (e.g., two or more user equipments (UEs)) may communicate with each other via broadcast transmissions, multicast connections, or unicast connections. For unicast connections, a first UE (e.g., a receiving UE) may establish multiple unicast connections with multiple other UEs (e.g., transmitting UEs), wherein 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 located at the front of the vehicle and a second TRP located 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 establishing unicast connections with the first UE increases, if communications via unicast connections occur at different times, the resources allocated to V2X communications may become overburdened, and the first UE may not be able to successfully receive or transmit messages to each of the multiple other UEs, thereby affecting V2X communications.

[0066] As described herein, for unicast communications, in order to effectively utilize V2X resources and achieve reliable spatial division multiplexing (SDM) reception, the receiving UE (e.g., the first UE) may coordinate scheduling with all transmitting UEs (e.g., based on the V2X service type and / or directional transmission characteristics with multiple TRPs). For example, the receiving UE may establish multiple unicast connections with various transmitting UEs, and a set of transmission parameters may be determined for each transmitting UE to achieve SDM reception from the transmitting UE at the receiving UE. That is, the receiving UE may request the transmitting UE (e.g., via a set of transmission parameters) to adjust its scheduling, transmit power, and transmit time based on power measurements of each TRP (e.g., reference signal strength indicator (RSSI), reference signal received power (RSRP), etc.), transmitting UE bias information, etc., to achieve SDM at the receiving UE.

[0067] Accordingly, transmissions from a given SDM transmitting UE may be received in separate TRPs, taking into account transmission directivity and unbalanced power measurements for each TRP. In some cases, the receiving UE may transmit a set of transmission parameters via a second phase sidelink control information (SCI) message. In addition, the receiving UE may transmit an indication of a demodulation reference signal (DMRS) cyclic shift and / or an indication of channel measurement resources (CMR) and interference measurement resources (IMR) to the transmitting UE to further enable the receiving UE to perform SDM on transmissions from the transmitting UE on the same set of time-frequency resources.

[0068] Aspects of the present disclosure are initially described in the context of wireless communication systems. In addition, aspects of the present disclosure are illustrated by additional wireless communication systems, broadcast types, link establishment, physical channel structures, unicast establishment, resource modes, and process flows. Aspects of the present disclosure are further illustrated and described by and with reference to apparatus diagrams, system diagrams, and flow diagrams related to unicast coordination for SDM communications.

[0069] Figure 1 An example of a wireless communication system 100 supporting unicast coordination for SDM communications in accordance with various aspects of the present disclosure is illustrated. The wireless communication system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a long term evolution (LTE) network, an advanced LTE (LTE-A) network, an LTE-A Pro network, or a new radio (NR) network. In some examples, the wireless communication system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission-critical) communications, low latency communications, communications with low-cost and low-complexity devices, or any combination thereof.

[0070] The base stations 105 may be dispersed throughout a geographic area to form the wireless communication system 100, and may be different forms of devices or devices with different capabilities. The base stations 105 and the UEs 115 may communicate wirelessly via one or more communication links 125. Each base station 105 may provide a coverage area 110 over which the UEs 115 and the base stations 105 may establish one or more communication links 125. The coverage area 110 may be an example of a geographic area over which the base stations 105 and the UEs 115 may support communication of signals according to one or more radio access technologies.

[0071] The UEs 115 may be dispersed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be stationary or mobile, or stationary and mobile at different times. The UEs 115 may be different forms of devices or devices with different capabilities. Figure 1Some example UEs 115 are illustrated in FIG. 1. The UEs 115 described herein may be capable of communicating with various types of devices, such as other UEs 115, base stations 105, or network equipment (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network equipment), such as Figure 1 as shown in .

[0072] Each base station 105 may communicate with the core network 130, or communicate with each other, or both. For example, the base station 105 may interface with the core network 130 via one or more backhaul links 120 (e.g., via S1, N2, N3 or other interfaces). The base stations 105 may communicate with each other directly (e.g., directly between the base stations 105), or indirectly (e.g., via the core network 130), or directly and indirectly on the backhaul link 120 (e.g., via X2, Xn or other interfaces). In some examples, the backhaul link 120 may be or include one or more wireless links.

[0073] One or more of the base stations 105 described herein may include or may be referred to by a person of ordinary skill in the art as a base transceiver station, a radio base station, an access point, a radio transceiver, a B node, an evolved B node (eNB), a next generation B node or a gigabit B node (any of which may be referred to as a gNB), a home B node, a home evolved B node, or other suitable terminology.

[0074] UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable term, where a "device" may also be referred to as a unit, a station, a terminal, or a client, etc. UE 115 may also include or may be referred to as a personal electronic device, such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communication (MTC) device, etc., which may be implemented in various objects such as electrical appliances or vehicles, meters, etc.

[0075] The UE 115 described herein may be capable of communicating with various types of devices, such as other UEs 115, which may sometimes act as relays, as well as base stations 105 and network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, relay base stations, etc. Figure 1 as shown in .

[0076] The UE 115 and the base station 105 may communicate wirelessly with each other via one or more communication links 125 on 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 link 125. For example, a carrier for the communication link 125 may include a portion of a radio frequency spectrum band (e.g., a bandwidth portion (BWP)) that operates 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 for coordinating carrier operations, user data, or other signaling. The wireless communication system 100 may support the use of carrier aggregation or multi-carrier operation to communicate with the UE 115. The UE 115 may be configured to have multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used in conjunction with both frequency division duplex (FDD) and time division duplex (TDD) component carriers.

[0077] In some examples (e.g., in a carrier aggregation configuration), a carrier may also have acquisition signaling or control signaling that coordinates the operation of other carriers. A carrier may be associated with a frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute Radio Frequency Channel Number (EARFCN)) and may be located according to a channel grid for discovery by UE 115. A carrier may operate in a standalone mode in which initial acquisition and connection may be made by UE 115 via the carrier, or a carrier may operate in a non-standalone mode in which a connection is anchored using a different carrier (e.g., a different carrier of the same or different radio access technology).

[0078] The communication link 125 shown in the wireless communication system 100 may include an uplink transmission from the UE 115 to the base station 105, or a downlink transmission from the base station 105 to the UE 115. A carrier may carry downlink or uplink communications (e.g., in an FDD mode), or may be configured to carry both downlink and uplink communications (e.g., in a TDD mode).

[0079] A carrier may be associated with a particular bandwidth of a radio frequency spectrum, and in some examples, the carrier bandwidth may be referred to as a "system bandwidth" of the carrier or wireless communication system 100. For example, the carrier bandwidth may be one of several determined bandwidths (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz)) of a carrier of a particular radio access technology. Devices (e.g., base stations 105, UEs 115, or both) of the wireless communication system 100 may have a hardware configuration that supports communications on a particular carrier bandwidth, or may be configurable to support communications on one of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 or UE 115 that supports simultaneous communications via carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured to operate on a portion (e.g., subband, BWP) or all of a carrier bandwidth.

[0080] The signal waveform transmitted on the carrier may include 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 using MCM technology, a resource element may include a code element period (e.g., the duration of a modulation code element) and a subcarrier, where the code element period and the 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 code rate of the modulation scheme, or both). Thus, the more resource elements received by UE 115 and the higher the order of the modulation scheme, the higher the data rate of UE 115 can be. Wireless communication resources may refer to a combination of radio frequency spectrum resources, time resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers can further improve the data rate or data integrity of communication with UE 115.

[0081] One or more parameter designs for a carrier may be supported, where the parameter designs may include subcarrier spacing (Δf) and cyclic prefixes. A carrier may be divided into one or more BWPs with the same or different parameter designs. In some examples, a UE 115 may be configured with multiple BWPs. In some examples, a single BWP for a carrier may be active at a given time, and communications for a UE 115 may be limited to the one or more active BWPs.

[0082] The time interval of the base station 105 or the UE 115 can be expressed as a multiple of a basic time unit, and the basic time unit can be, for example, a sampling period T s =1 / (Δf max ·N f ) seconds, where Δf max It can represent the maximum supported subcarrier spacing, and N fThe maximum supported discrete Fourier transform (DFT) size may be indicated. Time intervals of communication resources 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).

[0083] Each frame may include a plurality of consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, a frame may be divided into subframes (e.g., in the time domain), and each subframe may be further divided into a number of time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each time slot may include a number of code element periods (e.g., depending on the length of the cyclic prefix added before each code element period). In some wireless communication systems 100, a time slot may be further divided into a plurality of mini-time slots containing one or more code elements. Excluding the cyclic prefix, each code element period may contain one or more (e.g., N f The duration of a symbol period may depend on the subcarrier spacing or the operating band.

[0084] A subframe, slot, mini-slot, or symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communication system 100 and may be referred to as a transmission time interval (TTI). In some examples, the TTI duration (e.g., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs)).

[0085] Physical channels may be multiplexed on a carrier according to various techniques. Physical control channels and physical data channels may be multiplexed on a downlink carrier, for example, using one or more of a time division multiplexing (TDM) technique, a frequency division multiplexing (FDM) technique, or a hybrid TDM-FDM technique. 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 a system bandwidth or a subset of a system bandwidth of a carrier. One or more control regions (e.g., CORESETs) may be configured for a set of UEs 115. For example, one or more of the UEs 115 may monitor or search a control region for control information according to one or more search space sets, and each search space set may include one or more 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 the number of control channel resources (e.g., control channel elements (CCEs)) associated with coded information for a control information format having a given payload size. The search space sets may include a common search space set configured for transmitting control information to multiple UEs 115 and a UE-specific search space set for transmitting control information to a specific UE 115 .

[0086] Each base station 105 may provide communication coverage via one or more cells (e.g., macro cells, small cells, hot spots, or other types of cells, or any combination thereof). The term "cell" may refer to a logical communication entity used to communicate with a base station 105 (e.g., on a carrier), and may be associated with an identifier (e.g., a physical cell identifier (PCID), a virtual cell identifier (VCID), or other) used to distinguish adjacent cells. In some examples, a cell may also refer to a geographic coverage area 110 or a portion of a geographic coverage area 110 (e.g., a sector) on which a logical communication entity operates. The range of such a cell may range from a smaller area (e.g., a structure, a subset of a structure) to a larger area depending on various factors (such as the capabilities of the base station 105). For example, a cell may be or include a building, a subset of a building, or an external space between or overlapping a geographic coverage area 110, as well as other examples.

[0087] A macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access to UEs 115 that have service subscriptions with a network provider that supports the macro cell. A small cell may be associated with a lower power base station 105 (compared to a macro cell), and the small cell may operate in the same or different (e.g., licensed, unlicensed) frequency band as the macro cell. A small cell may provide unrestricted access to UEs 115 that have service subscriptions with a network provider, or may provide restricted access to UEs 115 associated with the small cell (e.g., UEs 115 in a closed subscriber group (CSG), UEs 115 associated with users in a home or office). A base station 105 may support one or more cells and may also support communications on one or more cells using one or more component carriers.

[0088] 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 to different types of devices.

[0089] In some examples, base stations 105 may be mobile and, therefore, provide communication coverage for mobile geographic coverage areas 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. The wireless communication system 100 may include, for example, a heterogeneous network in which different types of base stations 105 provide coverage for various geographic coverage areas 110 using the same or different radio access technologies.

[0090] The wireless communication system 100 may support synchronous or asynchronous operation. For synchronous operation, the base stations 105 may have similar frame timing, and transmissions from different base stations 105 may be approximately aligned in time. For asynchronous operation, the base stations 105 may have different frame timing, and transmissions from different base stations 105 may not be aligned in time in some examples. The techniques described herein may be used for synchronous or asynchronous operation.

[0091] Some UEs 115, such as MTC or IoT devices, may be low-cost or low-complexity devices and may provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC may refer to data communication technology that allows devices to communicate with each other or with a base station 105 without 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 that utilizes the information or presents the information to a person interacting with the application. Some UEs 115 may be designed to collect information or implement automated behavior of machines or other devices. Examples of applications for MTC devices include: smart metering, inventory monitoring, water level monitoring, equipment monitoring, health care monitoring, field survival monitoring, weather and geographic event monitoring, queue management and tracking, remote security sensing, physical access control, and transaction-based commercial charging.

[0092] Some UEs 115 may be configured to employ a reduced power consumption mode of operation, such as half-duplex communication (e.g., a mode that supports unidirectional communication via transmission or reception but not simultaneous transmission and reception). In some examples, half-duplex communication may be performed with a reduced peak rate. Other power saving techniques for UE 115 include entering a power saving deep sleep mode when not engaged in active communications, operating on a limited bandwidth (e.g., according to narrowband communications), or a combination of these techniques. For example, some UEs 115 may be configured to operate using a narrowband protocol type that is associated with a defined portion or range (e.g., a subcarrier or resource block (RB) set) within a carrier, within a guard band of a carrier, or outside a carrier.

[0093] The wireless communication system 100 may be configured to support ultra-reliable communication or low latency communication or various combinations thereof. For example, the wireless communication system 100 may be configured to support ultra-reliable low latency communication (URLLC) or mission-critical communication. UE 115 may be designed to support ultra-reliable, low latency or critical functions (e.g., mission-critical functions). Ultra-reliable communication 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, critical mission, and ultra-reliable low latency may be used interchangeably herein.

[0094] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or a 5G core (5GC), and the EPC or 5GC may include at least one control plane entity (e.g., a mobility management entity (MME), an access and mobility management function (AMF)) for managing access and mobility, and at least one user plane entity (e.g., a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)) for routing packets or interconnecting to an external network. The control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management of UE 115 served by a base station 105 associated with the core network 130. User IP packets may be delivered via a user plane entity, which may provide IP address allocation and other functions. The user plane entity may be connected to the IP service 150 of one or more network operators. The IP services 150 may include access to the Internet, an intranet, an IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0095] Some network devices (such as base stations 105) may include subcomponents, such as access network entities 140, which may be examples of access node controllers (ANCs). Each access network entity 140 may communicate with each UE 115 through one or more other access network transport entities 145, which may be referred to as radio heads, smart radio heads, or TRPs. Each access network transport entity 145 may include one or more antenna panels. In some configurations, the various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio heads and ANCs) or merged into a single network device (e.g., base station 105).

[0096] The wireless communication system 100 may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). In general, the 300 MHz to 3 GHz region is referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from about 1 decimeter to 1 meter long. UHF waves may be blocked or redirected by buildings and environmental features, but these waves may penetrate various structures sufficiently for macro cells to provide service to UEs 115 located indoors. Transmissions using UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) than transmissions using smaller frequencies and longer waves in the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0097] The wireless communication system 100 may utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 may employ licensed 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 an unlicensed radio frequency spectrum band, devices (such as base stations 105 and UEs 115) may employ carrier sensing for conflict detection and avoidance. In some examples, operations in an unlicensed band may be based on a carrier aggregation configuration (e.g., LAA) in coordination with component carriers operating in a licensed band. Operations in an unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among others.

[0098] The base station 105 or UE 115 may be equipped with multiple antennas, which can be used to employ technologies such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of the base station 105 or UE 115 may be located in one or more antenna arrays or antenna panels that can 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, the antennas or antenna arrays associated with the base station 105 may be located at different geographical locations. The base station 105 may have an antenna array having antenna ports of several rows and columns that the base station 105 can use to support beamforming for communications with the UE 115. Similarly, the UE 115 may have one or more antenna arrays that can support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support radio frequency beamforming for signals transmitted via the antenna ports.

[0099] The base station 105 or UE 115 can use MIMO communication to utilize multipath signal propagation and improve spectral efficiency by transmitting or receiving multiple signals via different spatial layers. Such technology may be referred to as spatial multiplexing. For example, the transmitting device may transmit multiple signals via different antennas or different antenna combinations. Similarly, the receiving device may receive multiple signals via different antennas or different antenna combinations. 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 for channel measurement and reporting. MIMO technology includes single-user MIMO (SU-MIMO), in which multiple spatial layers are transmitted to the same receiving device; and multi-user MIMO (MU-MIMO), in which multiple spatial layers are transmitted to multiple devices.

[0100] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105, a UE 115) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining signals communicated via antenna elements of an antenna array so that some signals propagating at a particular orientation relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to signals communicated via antenna elements may include the transmitting device or the receiving device applying an amplitude offset, a phase offset, or both to signals carried via antenna elements associated with the device. Adjustments associated with each antenna element may be defined by a set of beamforming weights associated with a particular orientation (e.g., relative to the antenna array of the transmitting device or the receiving device, or relative to some other orientation).

[0101] The base station 105 or the UE 115 may use beam sweeping techniques as part of a beamforming operation. For example, the base station 105 may use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communication with the UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted multiple times by the base station 105 in different directions. For example, the base station 105 may transmit signals according to different sets of beamforming weights associated with different transmission directions. Transmissions in different beam directions may be used (e.g., by a transmitting device (such as the base station 105) or a receiving device (such as the UE 115)) to identify a beam direction used by the base station 105 for later transmission or reception.

[0102] Some signals, such as data signals associated with a particular recipient device, may be transmitted by base station 105 in a single beam direction, e.g., a direction associated with a recipient device, such as UE 115. In some examples, a beam direction associated with transmissions along a single beam direction may be determined based on signals transmitted in one or more beam directions. For example, UE 115 may receive one or more signals transmitted by base station 105 in different directions and may report to base station 105 an indication of the signal received by UE 115 with the highest signal quality or other acceptable signal quality.

[0103] In some examples, transmission by a device (e.g., by a base station 105 or a UE 115) may be performed using multiple beam directions, and the device may use a combination of digital precoding or radio frequency beamforming to generate a combined beam for transmission (e.g., from the base station 105 to the UE 115). The UE 115 may report feedback indicating precoding weights for one or more beam directions, and the feedback may correspond to a configured number of beams across the system bandwidth or one or more subbands. The base station 105 may transmit a reference signal that may be precoded or unprecoded (e.g., a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS)). The UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., a multi-panel type codebook, a linear combination type codebook, a port selection type codebook). Although these techniques are described with reference to signals transmitted by base station 105 in one or more directions, UE 115 may use similar techniques to transmit signals multiple times in different directions (e.g., to identify a beam direction for subsequent transmission or reception by UE 115) or to transmit signals in a single direction (e.g., to transmit data to a receiving device).

[0104] A receiving device (e.g., UE 115) may try multiple reception configurations (e.g., directional listening) when receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from a base station 105. For example, the receiving device may try multiple reception directions by receiving via different antenna subarrays, processing received signals according to different antenna subarrays, 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 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 reception configurations or reception directions. In some examples, the receiving device may use a single reception configuration to receive along a single beam direction (e.g., when receiving a data signal). The single reception configuration may be aligned on a beam direction determined based on listening according to different reception configuration directions (e.g., a beam direction determined to have the highest signal strength, the highest signal-to-noise ratio (SNR), or other acceptable signal quality based on listening according to multiple beam directions).

[0105] The wireless communication system 100 can be a packet-based network that operates according to a layered protocol stack. In the user plane, the communication of the bearer or packet data convergence protocol (PDCP) layer can be based on IP. The radio link control (RLC) layer can perform packet segmentation and reorganization to communicate on the logical channel. The media access control (MAC) layer can perform priority handling and multiplex the logical channel into the transport channel. The MAC layer can also use error detection technology, error correction technology, or both to support the retransmission of the MAC layer to improve link efficiency. In the control plane, the radio resource control (RRC) protocol layer can provide the establishment, configuration and maintenance of the RRC connection of the radio bearer that supports user plane data between the UE 115 and the base station 105 or the core network 130. In the physical layer, the transport channel can be mapped to the physical channel.

[0106] UE 115 and base station 105 may support retransmission of data to increase the likelihood that the data is successfully received. Hybrid automatic repeat request (HARQ) feedback is a technique for increasing the likelihood that data is correctly received on communication link 125. HARQ may include a combination of error detection (e.g., using a cyclic redundancy check (CRC)), forward error correction (FEC), and retransmission (e.g., automatic repeat request (ARQ)). HARQ may improve the throughput of the MAC layer in poor radio conditions (e.g., low signal-to-noise ratio conditions). In some examples, a device may support simultaneous slot HARQ feedback, wherein the device may provide HARQ feedback in a specific time slot for data received in a previous symbol in the time slot. In other cases, the device may provide HARQ feedback in a subsequent time slot or according to some other time interval.

[0107] In some examples, UE 115 may also be able to communicate directly with other UE 115 over a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) or D2D protocol). One or more UEs 115 utilizing D2D communication may be within a geographic coverage area 110 of a base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of the base station 105, or may not be able to receive transmissions from the base station 105 for other reasons. In some examples, each group of UEs 115 communicating via D2D communication may utilize a one-to-many (1:M) system, wherein each UE 115 transmits to each other UE 115 in the group. In some examples, the base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between each UE 115 without involving the base station 105.

[0108] In some systems, the D2D communication link 135 can be an example of a communication channel (such as a sidelink communication channel) between vehicles (e.g., UE 115). In some examples, the vehicles can communicate using V2X communication, vehicle-to-vehicle (V2V) communication, or some combination of these communications. The vehicles can signal information related to traffic conditions, signal scheduling, weather, safety, emergency situations, or any other information related to the V2X system. In some examples, vehicles in the V2X system can communicate with roadside infrastructure (such as a roadside unit), or communicate with the network via one or more network nodes (e.g., base station 105) using vehicle-to-network (V2N) communication, or both.

[0109] For V2X communication, two or more vehicles (e.g., two or more UEs) may communicate with each other via a broadcast transmission, a multicast connection, or a unicast connection. For a unicast connection, a first UE 115 (e.g., a receiving UE 115) may establish multiple unicast connections with multiple other UEs 115 (e.g., a transmitting UE 115). However, as the number of UEs / vehicles establishing unicast connections with the first UE 115 increases, if communications via unicast connections occur at different times and on different resources in the allocated V2X resources, the resources allocated to the V2X communication may become overburdened, and the first UE 115 may not be able to successfully receive or transmit messages to each of the multiple other UEs 115, thereby affecting the V2X communication.

[0110] The wireless communication system 100 may support efficient use of V2X resources for unicast communication based on a receiving UE 115 (e.g., a first UE 115) coordinating transmissions of multiple transmitting UEs 115 that have established unicast connections (e.g., unicast links) with the receiving UE 115 to implement SDM for received messages from multiple transmitting UEs 115 on the same set of time-frequency resources at the receiving UE 115. For example, the receiving UE 115 may establish multiple unicast connections with various transmitting UEs 115, and a set of transmission parameters may be determined for each transmitting UE 115 to implement SDM reception of messages from the transmitting UE 115 at the receiving UE 115. That is, the receiving UE 115 may request the transmitting UE 115 to adjust its scheduling, transmit power, and transmit time (e.g., via transmitting a corresponding set of transmission parameters to each transmitting UE 115) to achieve SDM at the receiving UE, where different transmission parameters are based on power measurements per TRP (e.g., RSSI, RSRP, etc.), transmitting UE bias information, or a combination thereof. In some implementations, the receiving UE 115 may transmit the set of transmission parameters to each transmitting UE 115 via a second stage SCI message.

[0111] Figure 2 An example of a wireless communication system 200 that supports unicast coordination for SDM communication according to aspects of the present disclosure is illustrated. The wireless communication system 200 may implement aspects of the wireless communication system 100. For example, the wireless communication system 200 may include a plurality of UEs 115, such as a receiving UE 115-a, a first transmitting UE 115-b, a second transmitting UE 115-c, a third transmitting UE 115-d, and a fourth transmitting UE 115-e, which may be represented as shown in reference Figure 1 An example of a UE 115 is described. The wireless communication system 200 may also support V2X communication between a receiving UE 115-a and a transmitting UE 115, where the V2X communication may include sidelink communication between the UEs 115.

[0112] In addition, the receiving UE 115-a may include multiple TRPs 205 for communicating with different transmitting UEs 115. Multi-TRP sidelink communication can enhance the coverage of the communication between the receiving UE 115-a and the transmitting UE 115. In addition, multiple TRPs 205 can improve reliability, coverage and capacity performance through flexible deployment scenarios. More specifically, multiple TRPs 205 equipped in different parts of a vehicle (e.g., in the receiving UE 115-a) can improve reliability in safety applications and other applications requiring high robustness. In some cases, data coverage may be biased from a transmission perspective. For example, side coverage may be unimportant for some situations (e.g., a TRP located on the side of a vehicle may not provide much value), and biased to the front or rear or 360-degree coverage around the vehicle may depend on the packet content or type. From the perspective of the receiver, multiple TRPs 205 at the vehicle may require 360-degree coverage. In this way, the receiving UE 115-a can use two TRPs 205 to receive packets from other UEs 115 (e.g., transmitting UE 115).

[0113] As shown, the receiving UE 115-a may include a first TRP 205-a located at the rear of a vehicle and a second TRP 205-b located at the front of the vehicle. Accordingly, the receiving UE 115-a may receive packets from the first transmitting UE 115-b and the second transmitting UE 115-c via the first TRP 205-a, and may receive packets from the third transmitting UE 115-d and the fourth transmitting UE 115-e via the second TRP 205-b. Using each TRP 205, the receiving UE 115-a may establish a corresponding unicast connection (e.g., a unicast link) with each transmitting UE 115. For example, the receiving UE 115-a may establish a first unicast connection 210-a with the first transmitting UE 115-b via the first TRP 205-a, establish a second unicast connection 210-b with the second transmitting UE 115-c via the first TRP 205-a, establish a third unicast connection 210-c with the third transmitting UE 115-d via the second TRP 205-b, and establish a fourth unicast connection 210-d with the fourth transmitting UE 115-e via the second TRP 205-b. In some cases, each unicast connection 210 may be referred to as a PC5 unicast link based on the sidelink communication between the receiving UE 115-a and each transmitting UE 115 and the sidelink communication occurring on the PC5 interface.

[0114] As described herein, in order to efficiently utilize V2X resources (e.g., time-frequency resources allocated for V2X communication) and achieve reliable SDM reception using unicast connection 210, the receiving UE 115-a may coordinate scheduling with all transmitting UEs 115. In some implementations, scheduling coordination may take into account, for example, V2X service type and / or directional transmission characteristics based on multiple TRPs 205. That is, the receiving UE 115-a may coordinate how each transmitting UE 115 should transmit packets, coordinate which TRP 205 of the receiving UE 115-a each transmitting UE 115 should connect to, or coordinate both based on the V2X service type. In addition, by coordinating the scheduling of all transmitting UEs 115, the receiving UE 115-a may be able to receive packets from each transmitting UE 115 on the same set of time-frequency resources (e.g., at the same time on the same set of frequencies) using an SDM configuration or scheme. Accordingly, the receiving UE 115-a can receive V2X service data from multiple transmitting UEs 115 via the corresponding unicast connection 210, wherein the V2X service data received from the transmitting UE 115 can be SDMed at the receiving UE 115-a based on the transmission directionality at the receiving UE 115-a (e.g., measured via RSRP).

[0115] As part of coordinating scheduling with the transmitting UE 115, the receiving UE 115-a may request each transmitting UE 115 to adjust its scheduling, transmit power, and transmit time (e.g., transmission parameters) to enable SDM reception at the receiving UE 115-a. In some implementations, the receiving UE 115-a may determine the adjustments for each transmitting UE 115 based on RSSI or RSRP measurements of each TRP 205 of the receiving UE 115-a, based on transmission bias information, or a combination thereof. That is, taking into account the transmission directionality and the unbalanced power measurements of each TRP, a packet from one of the SDM transmitting UEs 115 may be received in a separate TRP 205. In this case, the receiving UE 115-a may indicate the recommended time-frequency resources to the transmitting UE 115 to allow different transmitting UEs 115 to use the same or overlapping resources. Accordingly, based on these techniques, a receiving UE 115-a (e.g., a UE with multi-TRP capability) can support SDM reception in various unicast connections. The receiving UE 115-a can indicate coordination information (e.g., a set of transmission parameters) to the transmitting UE 115 as part of a second stage SCI message (e.g., as a resource bit map).

[0116] For example, the receiving UE 115 may determine a different set of transmission parameters 215 for each transmitting UE 115, and may then transmit each set of transmission parameters 215 to the corresponding transmitting UE 115. As shown, the receiving UE 115-a may transmit a first set of transmission parameters 215-a to a first transmitting UE 115-b via a first unicast connection 210-a, transmit a second set of transmission parameters 215-b to a second transmitting UE 115-c via a second unicast connection 210-b, transmit a third set of transmission parameters 215-c to a third transmitting UE 115-d via a third unicast connection 210-c, and transmit a fourth set of transmission parameters 215-d to a fourth transmitting UE 115-e via a fourth unicast connection 210-d. These transmission parameters 215 may enable SDM reception of packets from a transmitting UE 115 at a receiving UE 115-a by adjusting the transmit power of different transmitting UEs 115 to allow the receiving UE 115-a to identify individual packet transmissions from each transmitting UE 115 on the same set of time-frequency resources based on different transmit power identities.

[0117] In addition, based on multiple TRPs 205, the receiving UE 115-a can indicate the same coordination information to the transmitting UE 115 (e.g., the first transmitting UE 115-b or the second transmitting UE 115-c) connected to the first TRP 205-a and the transmitting UE 115 (e.g., the third transmitting UE 115-d or the fourth transmitting UE 115-e) connected to the second TRP 205-b. That is, the coordination information for each transmitting UE 115 can be determined on a per-TRP basis. The receiving UE 115-a can be able to determine the coordination information per TRP because, based on directional transmissions (e.g., beamformed transmissions) from different transmitting UEs 115, the transmission received on the first TRP 205-a can have minimal impact on the transmission received on the second TRP 205-b.

[0118] In some implementations, the receiving UE 115-a may determine additional parameters or information for each transmitting UE 115 and transmit these additional parameters or information to each transmitting UE 115 to further enable the receiving UE 115-a to receive packets from each transmitting UE 115 on the same set of time-frequency resources and implement SDM reception of these packets. For example, the receiving UE 115-a may determine and indicate a recommended control DMRS cyclic shift to each transmitting UE 115, wherein the recommended control DMRS cyclic shift may indicate different decoding resources for each transmitting UE 115 to implement packet reception on conflicting time-frequency resources at the receiving UE 115-a. Additionally or alternatively, the receiving UE 115-a may determine and indicate recommended CMR(s) and IMR(s) to each transmitting UE 115, which may enable the receiving UE 115 to perform accurate channel estimation in order to subsequently combine packets between multiple TRPs 205.

[0119] Figure 3A , 3B , 3C, and 3D illustrate examples of broadcast types 300, 301, 302, and 303 according to aspects of the present disclosure. Broadcast types 300, 301, 302, and 303 may implement aspects of wireless communication systems 100 and 200. For example, broadcast types 300, 301, 302, and 303 may include one or more UEs 115, where the UEs 115 communicate with each other via sidelink and V2X communications.

[0120] The broadcast type 300 may represent a broadcast configuration that causes the UE 115 to transmit V2X packets or information to one or more UEs 115. For example, the broadcast type 300 may include one or more broadcasts 305-a and 305-b transmitted by the UE 115 and available for reception by any nearby UE 115. The broadcast 305 may not be directed or transmitted specifically to any UE 115, but may be transmitted in all directions from the UE 115. The broadcast 305 may include V2X data for nearby UEs 115.

[0121] The broadcast type 301 may represent a connectionless multicast configuration that enables the UE 115 to transmit V2X packets or information to one or more UEs 115. The connectionless multicast configuration may be a negative acknowledgement (NACK) based configuration. For example, the UE 115 may first transmit V2X data to nearby UEs 115 using broadcasts 305-a and 305-b for range 310, and may receive a NACK feedback message (e.g., a physical (PHY) layer acknowledgement feedback message) from one or more nearby UEs 115 (e.g., indicating that the V2X data was not successfully received). Subsequently, the UE 115 may retransmit the V2X data specifically to those UEs 115 that transmitted the NACK feedback message.

[0122] The broadcast type 302 may represent a managed multicast configuration that enables the UE 115 to transmit V2X packets or information to one or more UEs 115. The managed multicast configuration may be a configuration based on positive acknowledgement (ACK). For example, the UE 115 may first transmit V2X data to a managed group 315 including the UEs 115, where after receiving an ACK from one or more UEs 115 in the managed group, the UE 115 may then receive V2X data from the one or more UEs 115.

[0123] The broadcast type 303 may represent a unicast configuration that enables the UE 115 to transmit V2X packets or information to an additional single UE 115. With the unicast configuration, the UE 115 and the additional UE 115 may exchange one or more messages 320. For example, the two UEs 115 may first exchange control signaling to establish a unicast connection (e.g., a unicast link) via different layers (e.g., PC5 sidelink (PC5-S), PC5-RRC, etc.). The two UEs 115 may then exchange acknowledgement feedback to indicate whether the unicast connection has been successfully established and then transmit V2X data between each other.

[0124] Figure 4An example of a link establishment 400 according to various aspects of the present disclosure is illustrated. The link establishment 400 can implement various aspects of the wireless communication systems 100 and 200. For example, the link establishment 400 may include a receiving UE 405 and one or more transmitting UEs 410, such as a first transmitting UE 410-a and a second transmitting UE 410-b. The link establishment 400 may represent a layer 2 link establishment for multiple unicast connections. For example, the receiving UE 405 can establish multiple PC5 unicast connections (e.g., unicast links) with multiple peer UEs 115. That is, the first transmitting UE 410-a and the second transmitting UE 410-b can both establish unicast connections with the receiving UE 405 according to the link establishment 400.

[0125] At 415, the receiving UE 405 may determine the destination layer 2 identity for signaling reception. For example, the receiving UE 405 may determine the identities of the transmitting UE 410 and the transmitting UE 115 for signaling reception.

[0126] At 420, the V2X application layer of the transmitting UE 410 may provide the transmitting UE 410 with application information for PC5 unicast communication with the receiving UE 405. At 425, the transmitting UE 410 may transmit a direct communication request to the receiving UE 405 based on the application information provided by the V2X application layer.

[0127] At 430, the receiving UE 405 may perform security establishment with the transmitting UE 410 based on the direct communication request. At 435, after security is established, the receiving UE 405 may transmit a direct communication accept message to each transmitting UE 410 via a corresponding unicast connection (e.g., a unicast link). Subsequently, at 440, the receiving UE 405 and the transmitting UE 410 may begin transmitting V2X service data to each other on the unicast connection. For example, the receiving UE 405 may receive V2X service data from both the first transmitting UE 410-a and the second transmitting UE 410-b using a dedicated unicast connection.

[0128] Figure 5 An example of a physical channel structure 500 according to various aspects of the present disclosure is illustrated. The physical channel structure 500 can implement various aspects of the wireless communication systems 100 and 200. For example, two UEs 115 can communicate with each other using sidelink communications configured based on the physical channel structure 500. The physical channel structure 500 can be used for resource reservation and PHY layer processing. In addition, the physical channel structure 500 can be used for both periodic transmissions and non-periodic transmissions. In some cases, a transmission can reserve resources in the current time slot and in up to two future time slots.

[0129] The physical channel structure 500 may include a physical sidelink control channel (PSCCH) 505, a physical sidelink shared channel (PSSCH) 510, one or more gaps 515, and a physical sidelink feedback channel (PSFCH) 520. The first stage control message (e.g., the first SCI message, SCI-1, etc.) can be transmitted on the PSCCH 505 and can include information for resource allocation and for decoding the second stage control message. The PSCCH 505 can be limited to a single subchannel, and a frequency domain orthogonal cover code (FD-OCC) can be applied to the DMRS to reduce the impact of conflicting PSCCH transmissions. In some cases, the transmitting UE 115 can randomly select an FD-OCC from a set of predefined FD-OCCs. The second stage control message (e.g., the second SCI message, SCI-2, etc.) can be transmitted on the PSSCH 510 and can include information for decoding data (e.g., shared channel (SCH) transmission). Accordingly, the receiving UE 115 may first decode the SCI (e.g., both the first stage control message and the second stage control message), and then decode the data. Subsequently, the receiving UE 115 may then transmit feedback (e.g., HARQ feedback) on resources in the PSFCH 520 after the gap 515, depending on the type of transmission and the feedback mode.

[0130] Accordingly, as described herein, when multiple unicast connections are established between a receiving UE 115 and multiple transmitting UEs 115, and in order to achieve SDM reception of packets from multiple transmitting UEs 115, the receiving UE 115 can determine transmission parameters (e.g., coordination information) for each of the multiple transmitting UEs 115, and can transmit the determined transmission parameters to the corresponding transmitting UE 115 via the second stage control message in the PSSCH 510.

[0131] Figure 6 An example of a unicast setup 600 supporting unicast coordination for SDM communication in accordance with aspects of the present disclosure is illustrated. The unicast setup 600 may implement aspects of the wireless communication systems 100 and 200. For example, the unicast setup 600 may include a receiving UE 605 and one or more transmitting UEs 610, such as a first transmitting UE 610-a, a second transmitting UE 610-b, a third transmitting UE 610-c, and a fourth transmitting UE 610-d.

[0132] At 615, the receiving UE 605 and each transmitting UE 610 may establish a corresponding unicast link (eg, a unicast connection). For example, as previously described with reference to Figure 4 The unicast link is established as described.

[0133] At 620, in case multiple unicast links are established, for SDM reception, in order to decode SCI (e.g., sidelink packets) in conflicting time-frequency resources, the receiving UE 605 can coordinate unicast scheduling to achieve reliable SDM reception with the transmitting UE 610. As part of coordinating unicast scheduling, the receiving UE 605 can.

[0134] At 625, the receiving UE 605 may transmit an SCI transmission (e.g., a second stage SCI) to each transmitting UE 610 to indicate transmission parameters for coordinated unicast scheduling. In addition, the receiving UE 605 may indicate a recommended control DMRS cyclic shift to be used by each SDM transmitting UE 615 to ensure accurate channel estimation and signal to interference plus noise ratio (SINR) estimation. For example, the receiving UE 605 may indicate a recommended cyclic shift for subsequent SCI transmissions sent by the transmitting UE 610 to avoid resource conflicts that lead to detection failures. The recommended control DMRS cyclic shift may be used to distinguish decoding resources between SDM transmitting UEs 610, and the receiving UE 605 may transmit the recommended control DMRS cyclic shift as part of UE coordination information via the second stage SCI. In some implementations, the selection of the transmitting UE 610 for SDM reception may be based on SCI detection and signal measurements (e.g., RSRP or RSSI measurements) among multiple TPRs located in the receiving UE 605.

[0135] Figure 7 An example of a unicast setup 700 supporting unicast coordination for SDM communication in accordance with aspects of the present disclosure is illustrated. The unicast setup 700 may implement aspects of the wireless communication systems 100 and 200. For example, the unicast setup 700 may include a receiving UE 705 and one or more transmitting UEs 710, such as a first transmitting UE 710-a, a second transmitting UE 710-b, a third transmitting UE 710-c, and a fourth transmitting UE 710-d.

[0136] At 715, the receiving UE 705 and each transmitting UE 710 may establish a corresponding unicast link (eg, a unicast connection). For example, as previously described with reference to Figure 4 The unicast link is established as described.

[0137] At 720, in the case where multiple unicast links are established, for SDM reception, in order to decode SCI (e.g., side link packets) in conflicting time-frequency resources, the receiving UE 705 can coordinate unicast scheduling to achieve reliable SDM reception with the transmitting UE 710. In addition, in order to achieve reliable SDM reception, the receiving UE 705 can indicate the recommended CMR and IMR to each SDM transmitting UE 710. The recommended CMR and IMR can enable the receiving UE 705 to generate accurate channel or SINR estimates for the reception combination between multiple TRPs located in the receiving UE 705, or decide whether the reception combination is feasible. For example, the receiving UE 705 can use the recommended CMR and IMR as part of estimating the channel and interference level at the conflicting time-frequency resources used by the SDM transmitting UE 710 among multiple TRPs located in the receiving UE 705. In some implementations, the receiving UE 705 can transmit this indication of the CMR and IMR via the second stage SCI as part of the UE coordination information.

[0138] Figure 8 An example of a resource pattern 800 supporting unicast coordination for SDM communication in accordance with aspects of the present disclosure is illustrated. The resource pattern 800 may implement aspects of the wireless communication systems 100 and 200. For example, a receiving UE 115 may transmit an indication of the resource pattern 800 to one or more transmitting UEs 115 to enable the receiving UE 115 to perform SDM on transmissions received from the transmitting UE 115 on the same set of time-frequency resources. As shown, the receiving UE may receive a first transmission 805-a from a first transmitting UE 115, a second transmission 805-b from a second transmitting UE 115, a third transmission 805-c from a third transmitting UE 115, and a fourth transmission 805-d from a fourth transmitting UE 115. The transmission 805 from each transmitting UE 115 may be on a separate subchannel 810. In some implementations, the first transmission 805-a and the second transmission 805-b can be SDMed at the receiving UE 115 (e.g., via a first TRP), and the third transmission 805-c and the fourth transmission 805-d can be SDMed at the receiving UE 115 (e.g., via a second TRP).

[0139] In addition, resource pattern 800 may include one or more CMRs 815 and one or more IMRs 820. As previously described with reference Figure 7As described, the receiving UE 115 may use the CMR 815 and the IMR 820 to generate accurate channel or SINR estimates for receive combining between multiple TRPs located in the receiving UE 115, or to decide whether receive combining is feasible. In addition, the receiving UE 115 may transmit an indication of the CMR 815 and the IMR 820 via a second stage SCI (e.g., together with an indication of the resource pattern 800 or independently of an indication of the resource pattern 800).

[0140] In some implementations, CMR 815 and IMR 820 may be part of a channel state information reference signal (CSI-RS) configuration. Additionally or alternatively, CMR 815 and IMR 820 may be part of a control DMRS, a data DMRS, or an even data or control resource element (RE).

[0141] In addition, one or more of the transmitting UEs 115 may introduce zero power (ZP) resources to enable the receiving UEs 115 to estimate the interference power from other SDM transmitting UEs 115. For example, when SDM reception is enabled, one or more transmitting UEs 115 may transmit the ZP resources using the IMR 820 used for interference measurement in the receiving UEs 115. The receiving UEs 115 may then use the IMR 820 to estimate the interference measurement per TRP and decide whether to enable reception combining across TRPs.

[0142] In order to achieve reliable SDM reception, the receiving UE 115 may decide to trigger CMR 815 and IMR 820 scheduling. For example, the receiving UE 115 may determine to trigger CMR 815 and IMR 820 scheduling based on resource reservation information decoded by the SDM reception procedure, channel busy rate (CBR) measurement, etc. Additionally or alternatively, the CMR 815 and IMR 820 may be triggered or scheduled by one or more of the transmitting UEs 115. For example, one or more transmitting UEs 115 may determine to trigger CMR 815 and IMR 820 based on CBR measurement, consecutive transmission failure, etc. In some implementations, the receiving UE 115 may then reconfigure resource allocation to include CMR 815 and IMR 820 for all transmitting UEs 115 based on the trigger received from one or more transmitting UEs 115, or the reconfigured resource allocation may be recommended by the receiving UE 115.

[0143] Fig. 9An example of a process flow 900 that supports unicast coordination for SDM communications in accordance with aspects of the present disclosure is illustrated. The process flow 900 may implement aspects of the wireless communication systems 100 and 200. For example, the process flow 900 may include a receiving UE 115-f and one or more transmitting UEs 115, such as a transmitting UE 115-g and a transmitting UE 115-h.

[0144] In the following description of process flow 900, the operations between the receiving UE 115-f, the transmitting UE 115-g, and the transmitting UE 115-h may be transmitted in an order different from the exemplary order shown, or the operations performed by the receiving UE 115-f, the transmitting UE 115-g, and the transmitting UE 115-h may be performed in a different order or at a different time. Certain operations may also be excluded from process flow 900, or other operations may be added to process flow 900. It will be understood that although the receiving UE 115-f, the transmitting UE 115-g, and the transmitting UE 115-h are shown as performing several operations of process flow 900, any wireless device may perform the operations shown.

[0145] At 905, the transmitting UE 115-g and the transmitting UE 115-h may transmit a request (eg, a unicast connection request) to the receiving UE 115-f to establish a unicast connection with a first TRP among a plurality of TRPs of the receiving UE 115-f.

[0146] At 910, a receiving UE 115-f may establish a set of unicast connections (e.g., based on a request to establish unicast connections) with a plurality of transmitting UEs 115 including a transmitting UE 115-g and a transmitting UE 115-h, the plurality of transmitting UEs 115 including one or more first transmitting UEs 115 connected to a first TRP of the receiving UE 115-f via respective unicast connections in the set of unicast connections, and one or more second transmitting UEs 115 connected to a second TRP of the receiving UE 115-f via respective unicast connections in the set of unicast connections. In some implementations, the receiving UE 115-f may select the plurality of transmitting UEs 115 for establishing the set of unicast connections based on detecting an SCI message (e.g., a unicast connection request) from each of the plurality of transmitting UEs 115, performing a signal quality measurement for each transmitting UE 115 in the first TRP and the second TRP of the receiving UE 115-f, or a combination thereof.

[0147] At 915, the receiving UE 115-f may determine a plurality of transmission parameter sets for the plurality of transmitting UEs 115, wherein the plurality of transmission parameter sets may enable the receiving UE 115-f to receive transmissions from the plurality of transmitting UEs 115 on the same set of time-frequency resources via the SDM scheme. In some implementations, the receiving UE 115-f may determine the plurality of transmission parameter sets for the respective transmitting UEs in the plurality of transmitting UEs based on which TRP of the receiving UE 115-f is used for the respective unicast connection with the transmitting UE 115 in the plurality of transmitting UEs. In addition, based on establishing a first unicast connection between the first transmitting UE 115 and the receiving UE 115-f via the first TRP and establishing a second unicast connection between the second transmitting UE 115 and the receiving UE 115-f via the second TRP, the same transmission parameter set may be used for the first transmitting UE 115 and the second transmitting UE 115 in the plurality of transmitting UEs 115.

[0148] In some implementations, the receiving UE 115-f may determine the plurality of transmission parameter sets based on one or more signal quality measurements of the group of unicast connections. For example, the one or more signal quality measurements may include RSSI measurements, RSRP measurements, bias information for each of the plurality of transmitting UEs 115, or a combination thereof. Additionally, each transmission parameter set may include a transmission scheduling adjustment, a transmit power, a transmit time, an indication of a time-frequency resource, or a combination thereof.

[0149] At 920, the receiving UE 115-f may transmit each of the plurality of transmission parameter sets to a corresponding transmitting UE 115 of the plurality of transmitting UEs 115. In some implementations, the receiving UE 115-f may transmit each of the transmission parameter sets to the corresponding transmitting UE 115 via an SCI message. For example, each of the transmission parameter sets may be indicated via a resource bitmap in an SCI message. Furthermore, the SCI message may be a second stage SCI message.

[0150] At 925, the receiving UE 115-f may transmit an indication of a control DMRS cyclic shift to the respective transmitting UE 115 for use by each transmitting UE 115 in transmitting communications to the receiving UE 115-f, wherein the control DMRS cyclic shift further enables the receiving UE 115-f to receive transmissions from the plurality of transmitting UEs 115 on the same set of time-frequency resources via the SDM scheme. In some implementations, the receiving UE 115-f may transmit the indication of the control DMRS cyclic shift to the respective transmitting UE 115 via an SCI message. For example, the SCI message may be a second stage SCI message for UE coordination.

[0151] At 930, the receiving UE 115-f may transmit an indication of the CMR and the IMR to the corresponding transmitting UE 115. In some implementations, the receiving UE 115-f may transmit the indication of the CMR and the IMR to each transmitting UE 115 via an SCI message. For example, the SCI message may be a second stage SCI message for UE coordination.

[0152] In some implementations, the receiving UE 115-f may determine to transmit an indication of CMR and 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 from one or more of the plurality of transmitting UEs 115 115 that CMR and IMR are to be triggered, or a combination thereof. In some implementations, the CMR and IMR may be part of a CSI-RS configuration. Additionally or alternatively, the CMR and IMR may include control DMRS resources, data DMRS resources, even-numbered data REs, even-numbered control REs, or a combination thereof.

[0153] Additionally or alternatively, the transmitting UE 115-g or the transmitting UE 115-h may determine that a trigger is to be transmitted to cause the receiving UE 115-f to transmit an indication of the CMR and the IMR. Subsequently, the transmitting UE 115-g or the transmitting UE 115-h may transmit the trigger to the receiving UE 115-f based on the determination. In some implementations, the transmitting UE 115-g or the transmitting UE 115-h may determine that a trigger is to be transmitted based on a CBR measurement, a number of consecutive transmission failures satisfying a threshold, or a combination thereof.

[0154] At 935 , the receiving UE 115 - f may receive one or more ZP resources for CMR, IMR, or both from one or more transmitting UEs 115 of the plurality of transmitting UEs 115 .

[0155] At 940, the receiving UE 115-f may receive one or more SDM transmissions from the plurality of transmitting UEs 115 based on the plurality of transmission parameter sets.

[0156] At 945, the receiving UE 115-f may estimate per-TRP channel measurements and interference measurements based on the indication of the CMR and IMR for transmissions from the plurality of transmitting UEs 115 on the same set of time-frequency resources, wherein the transmissions from the plurality of transmitting UEs 115 are received based on the estimation. In some implementations, the estimation of the interference measurement may be based on measurements of the ZP resource(s).

[0157] Fig.10A block diagram 1000 of a device 1005 supporting unicast coordination for SDM communications according to aspects of the present disclosure is shown. The device 1005 may be an example of aspects of a UE 115 as described herein. The device 1005 may include a receiver 1010, a transmitter 1015, and a communication manager 1020. The device 1005 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0158] The receiver 1010 may provide a means for receiving information such as packets associated with various information channels (e.g., control channels, data channels, information channels related to unicast coordination for SDM communications), user data, control information, or any combination thereof. The information may be communicated to other components of the device 1005. The receiver 1010 may utilize a single antenna or a collection including multiple antennas.

[0159] The transmitter 1015 may provide a means for transmitting signals generated by other components of the device 1005. For example, the transmitter 1015 may transmit information such as packets associated with various information channels (e.g., control channels, data channels, information channels related to size-based neural network selection for autoencoder-based communication), user data, control information, or any combination thereof. In some examples, the transmitter 1015 may be co-located with the receiver 1010 in a transceiver module. The transmitter 1015 may utilize a single antenna or a collection including multiple antennas.

[0160] The communication manager 1020, the receiver 1010, the transmitter 1015, 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.

[0161] In some examples, communication manager 1020, receiver 1010, transmitter 1015, or various combinations thereof or components thereof may be implemented in hardware (e.g., in communication 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, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

[0162] Additionally or alternatively, in some examples, the communication manager 1020, the receiver 1010, the transmitter 1015, or various combinations thereof, or components thereof may be implemented by code executed by a processor (e.g., as communication management software or firmware). If implemented in code executed by a processor, the functions of the communication manager 1020, the receiver 1010, the transmitter 1015, or various combinations thereof, or components thereof may be performed by a general purpose processor, a DSP, a central processing unit (CPU), an ASIC, an FPGA, or any combination of these or other programmable logic devices.

[0163] In some examples, communication manager 1020 may be configured to perform various operations (e.g., receive, monitor, transmit) using or otherwise cooperating with receiver 1010, transmitter 1015, or both. For example, communication manager 1020 may receive information from receiver 1010, send information to transmitter 1015, or be integrated in conjunction with receiver 1010, transmitter 1015, or both to receive information, transmit information, or perform various other operations described herein.

[0164] The communication manager 1020 may support wireless communication at a receiving UE according to the examples disclosed herein. For example, the communication manager 1020 may be configured to provide or support a device for establishing a set of multiple unicast connections with a group of multiple transmitting UEs, the group of multiple transmitting UEs including one or more first transmitting UEs connected to a first transmission reception point of the receiving UE via a corresponding unicast connection in the group of multiple unicast connections, and one or more second transmitting UEs connected to a second transmission reception point of the receiving UE via a corresponding unicast connection in the group of multiple unicast connections. The communication manager 1020 may be configured to provide or support a device for determining a set of multiple transmission parameter sets for the group of multiple transmitting UEs, the set of multiple transmission parameter sets enabling the receiving UE to receive transmissions from the group of multiple transmitting UEs on the same set of time-frequency resources via an SDM scheme. The communication manager 1020 may be configured to provide or support a device for transmitting each transmission parameter set in the set of multiple transmission parameter sets to a corresponding transmitting UE in the group of multiple transmitting UEs.

[0165] Additionally or alternatively, the communication manager 1020 may support wireless communications at a transmitting UE according to the examples disclosed herein. For example, the communication manager 1020 may be configured to provide or support a means for transmitting to a receiving UE a request to establish a unicast connection with a first transmitting reception point among a plurality of transmitting reception points of the receiving UE. The communication manager 1020 may be configured to provide or support a means for receiving from the receiving UE a set of transmission parameters to be used for subsequent communications on the unicast connection, the set of transmission parameters enabling the receiving UE to receive transmissions from a group of multiple transmitting UEs including the transmitting UE on the same set of time-frequency resources via an SDM scheme.

[0166] By including or configuring a communication manager 1020 according to the examples described herein, a device 1005 (e.g., a processor controlling or otherwise coupled to a receiver 1010, a transmitter 1015, a communication manager 1020, or a combination thereof) can support techniques for more efficiently utilizing 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.

[0167] Fig.11 A block diagram 1100 of a device 1105 supporting unicast coordination for SDM communications according to aspects of the present disclosure is shown. The device 1105 may be an example of aspects of the device 1005 or UE 115 as described herein. The device 1105 may include a receiver 1110, a transmitter 1115, and a communication manager 1120. The device 1105 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0168] The receiver 1110 may provide a means for receiving information such as packets associated with various information channels (e.g., control channels, data channels, information channels related to unicast coordination for SDM communications), user data, control information, or any combination thereof. The information may be communicated to other components of the device 1105. The receiver 1110 may utilize a single antenna or a collection including multiple antennas.

[0169] The transmitter 1115 may provide a means for transmitting signals generated by other components of the device 1105. For example, the transmitter 1115 may transmit information such as packets associated with various information channels (e.g., control channels, data channels, information channels related to size-based neural network selection for autoencoder-based communication), user data, control information, or any combination thereof. In some examples, the transmitter 1115 may be co-located with the receiver 1110 in a transceiver module. The transmitter 1115 may utilize a single antenna or a collection including multiple antennas.

[0170] The device 1105 or its various components may be examples of apparatuses for performing various aspects of unicast coordination for SDM communications as described herein. For example, the communication manager 1120 may include a unicast connection establishment component 1125, a transmission parameter determination component 1130, a transmission parameter indication component 1135, a unicast connection request component 1140, a transmission parameter receiving component 1145, or any combination thereof. The communication manager 1120 may be an example of various aspects of the communication manager 1020 as described herein. In some examples, the communication manager 1120 or its various components may be configured to perform various operations (e.g., receive, monitor, transmit) using the receiver 1110, the transmitter 1115, or both, or otherwise in cooperation with the receiver 1110, the transmitter 1115, or both. For example, the communication manager 1120 may receive information from the receiver 1110, send information to the transmitter 1115, or be integrated with the receiver 1110, the transmitter 1115, or both to receive information, transmit information, or perform various other operations described herein.

[0171] The communication manager 1120 may support wireless communication at a receiving UE according to the examples disclosed herein. The unicast connection establishment component 1125 may be configured to provide or support a means for establishing a set of multiple unicast connections with a group of multiple transmitting UEs, the group of multiple transmitting UEs including one or more first transmitting UEs connected to a first transmission reception point of the receiving UE via a corresponding unicast connection in the group of multiple unicast connections, and one or more second transmitting UEs connected to a second transmission reception point of the receiving UE via a corresponding unicast connection in the group of multiple unicast connections. The transmission parameter determination component 1130 may be configured to provide or support a means for determining a set of multiple transmission parameter sets for the group of multiple transmitting UEs, the set of multiple transmission parameter sets enabling the receiving UE to receive transmissions from the group of multiple transmitting UEs on the same set of time-frequency resources via an SDM scheme. The transmission parameter indication component 1135 may be configured to provide or support a means for transmitting each transmission parameter set in the set of multiple transmission parameter sets to a corresponding transmitting UE in the group of multiple transmitting UEs.

[0172] Additionally or alternatively, the communication manager 1120 may support wireless communications at a transmitting UE according to examples disclosed herein. The unicast connection request component 1140 may be configured to provide or support means for transmitting a request to a receiving UE to establish a unicast connection with a first transmission reception point of a plurality of transmission reception points of the receiving UE. The transmission parameter receiving component 1145 may be configured to provide or support means for receiving from the receiving UE a set of transmission parameters to be used for subsequent communications on the unicast connection, the set of transmission parameters enabling the receiving UE to receive transmissions from a group of multiple transmitting UEs including the transmitting UE on the same set of time-frequency resources via an SDM scheme.

[0173] Fig.12 A block diagram 1200 of a communication manager 1220 supporting unicast coordination for SDM communications in accordance with aspects of the present disclosure is shown. The communication manager 1220 may be an example of aspects of the communication manager 1020, the communication manager 1120, or both described herein. The communication manager 1220 or its various components may be an example of an apparatus for performing various aspects of unicast coordination for SDM communications as described herein. For example, the communication manager 1220 may include a unicast connection establishment component 1225, a transmission parameter determination component 1230, a transmission parameter indication component 1235, a unicast connection request component 1240, a transmission parameter reception component 1245, a DMRS cyclic shift indication component 1250, a measurement resource component 1255, a DMRS cyclic shift component 1260, a measurement resource indication component 1265, a measurement resource triggering component 1270, a measurement resource trigger initiation component 1275, or any combination thereof. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses).

[0174] The communication manager 1220 may support wireless communication at a receiving UE according to the examples disclosed herein. The unicast connection establishment component 1225 may be configured to provide or support a means for establishing a set of multiple unicast connections with a group of multiple transmitting UEs, the group of multiple transmitting UEs including one or more first transmitting UEs connected to a first transmission reception point of the receiving UE via a corresponding unicast connection in the group of multiple unicast connections, and one or more second transmitting UEs connected to a second transmission reception point of the receiving UE via a corresponding unicast connection in the group of multiple unicast connections. The transmission parameter determination component 1230 may be configured to provide or support a means for determining a set of multiple transmission parameter sets for the group of multiple transmitting UEs, the set of multiple transmission parameter sets enabling the receiving UE to receive transmissions from the group of multiple transmitting UEs on the same set of time-frequency resources via an SDM scheme. The transmission parameter indication component 1235 may be configured to provide or support a means for transmitting each transmission parameter set in the set of multiple transmission parameter sets to a corresponding transmitting UE in the group of multiple transmitting UEs.

[0175] In some examples, to support transmission of each transmission parameter set to a corresponding transmitting UE, transmission parameter indicating component 1235 may be configured to provide or support a device for transmitting each transmission parameter set to a corresponding transmitting UE via a sidelink control information message.

[0176] In some examples, each set of transmission parameters is indicated via a resource bitmap in a sidelink control information message.

[0177] In some examples, the sidelink control information message includes a second stage sidelink control information message.

[0178] In some examples, the DMRS cyclic shift indication component 1250 may be configured to provide or support a device for transmitting an indication of a control demodulation reference signal cyclic shift to a corresponding transmitting UE for use by each transmitting UE when transmitting communications to a receiving UE, wherein the control demodulation reference signal cyclic shift further enables the receiving UE to receive transmissions from the group of multiple transmitting UEs on the same set of time-frequency resources via an SDM scheme.

[0179] In some examples, to support transmitting an indication of a control demodulation reference signal cyclic shift, the DMRS cyclic shift indication component 1250 may be configured to provide or support a device for transmitting an indication of a control demodulation reference signal cyclic shift to a corresponding transmitting UE via a sidelink control information message.

[0180] In some examples, the sidelink control information message includes a second stage sidelink control information message for UE coordination.

[0181] In some examples, the measurement resource component 1255 can be configured to provide or support means for transmitting an indication of channel measurement resources and interference measurement resources to the respective transmitting UEs. In some examples, the measurement resource component 1255 can be configured to provide or support means for estimating channel measurements and interference measurements of each transmission reception point for transmissions from the group of multiple transmitting UEs on the same set of time-frequency resources based on the indication of the channel measurement resources and the interference measurement resources, wherein the transmissions from the group of multiple transmitting UEs are received based on the estimation.

[0182] In some examples, to support transmitting indications of channel measurement resources and interference measurement resources, the measurement resource indication component 1265 may be configured to provide or support a device for transmitting indications of channel measurement resources and interference measurement resources to each transmitting UE via a sidelink control information message.

[0183] In some examples, the sidelink control information message includes a second stage sidelink control information message for UE coordination.

[0184] In some examples, the measurement resource component 1255 may be configured to provide or support a device for receiving zero power resources for channel measurement resources, interference measurement resources, or both from one or more transmitting UEs in the group of multiple transmitting UEs, wherein the estimated interference measurement is based on a measurement of the zero power resources.

[0185] In some examples, measurement resource triggering component 1270 may be configured to provide or support means for determining, based on a trigger, to transmit indications of channel measurement resources and interference measurement resources.

[0186] In some examples, the trigger includes a resource reservation information message decoded based on the SDM scheme, a channel busy rate measurement, an indication received from one or more transmitting UEs in the group of multiple transmitting UEs to trigger channel measurement resources and interference measurement resources, or a combination thereof.

[0187] In some examples, the channel measurement resources and the interference measurement resources are part of a channel state information reference signal configuration.

[0188] In some examples, the channel measurement resources and interference measurement resources 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.

[0189] In some examples, the unicast connection establishment component 1225 may be configured to provide or support a device for selecting the group of multiple transmitting UEs to establish the group of multiple unicast connections based on detecting a side link control information message from each transmitting UE in the group of multiple transmitting UEs, performing signal quality measurements for each transmitting UE among a first transmission receiving point and a second transmission receiving point of the receiving UE, or a combination thereof.

[0190] In some examples, to support determining the group of multiple transmission parameter sets, the transmission parameter determination component 1230 may be configured to provide or support a device for determining the group of multiple transmission parameter sets for corresponding transmitting UEs in the group of multiple transmitting UEs based on which transmission reception point of the receiving UE is used for the corresponding unicast connection with the transmitting UE in the group of multiple transmitting UEs.

[0191] In some examples, based on establishing a first unicast connection between a first transmitting UE and a receiving UE via a first transmission receiving point and establishing a second unicast connection between a second transmitting UE and a receiving UE via a second transmission receiving point, the same set of transmission parameters is used for the first transmitting UE and the second transmitting UE in the group of multiple transmitting UEs.

[0192] In some examples, to support determining the group of multiple transmission parameter sets, the transmission parameter determination component 1230 may be configured to provide or support a device for determining the group of multiple transmission parameter sets based on one or more signal quality measurements of the group of multiple unicast connections.

[0193] In some examples, the one or more signal quality measurements include a reference signal strength indicator measurement, a reference signal received power measurement, bias information for each of the set of multiple transmitting UEs, or a combination thereof.

[0194] In some examples, each set of transmission parameters includes a transmission scheduling adjustment, a transmit power, a transmit time, an indication of time-frequency resources, or a combination thereof.

[0195] Additionally or alternatively, the communication manager 1220 may support wireless communications at a transmitting UE according to examples disclosed herein. The unicast connection request component 1240 may be configured to provide or support means for transmitting to a receiving UE a request to establish a unicast connection with a first transmit reception point of a plurality of transmit reception points of the receiving UE. The transmission parameter receiving component 1245 may be configured to provide or support means for receiving from the receiving UE a set of transmission parameters for subsequent communications on the unicast connection, the set of transmission parameters enabling the receiving UE to receive transmissions from a group of multiple transmitting UEs including the transmitting UE on the same set of time-frequency resources via an SDM scheme.

[0196] In some examples, to support receiving a set of transmission parameters, transmission parameter receiving component 1245 may be configured to provide or support a device for receiving a set of transmission parameters from a recipient UE via a sidelink control information message.

[0197] In some examples, the set of transmission parameters is indicated via a resource bitmap in a sidelink control information message.

[0198] In some examples, the sidelink control information message includes a second stage sidelink control information message.

[0199] In some examples, the DMRS cyclic shift component 1260 may be configured to provide or support a device for receiving an indication of a control demodulation reference signal cyclic shift to be used for subsequent communications from a receiving UE, wherein the control demodulation reference signal cyclic shift further enables the receiving UE to receive transmissions from the group of multiple transmitting UEs on the same set of time-frequency resources via an SDM scheme.

[0200] In some examples, to support receiving an indication of a control demodulation reference signal cyclic shift, the DMRS cyclic shift component 1260 may be configured to provide or support a device for receiving an indication of a control demodulation reference signal cyclic shift from a receiving UE via a sidelink control information message.

[0201] In some examples, the sidelink control information message includes a second stage sidelink control information message for UE coordination.

[0202] In some examples, measurement resource component 1255 may be configured to provide or support means for receiving indications of channel measurement resources and interference measurement resources for subsequent communications from a receiving UE.

[0203] In some examples, to support receiving indications of channel measurement resources and interference measurement resources, measurement resource component 1255 may be configured to provide or support a device for receiving indications of channel measurement resources and interference measurement resources from a receiving UE via a sidelink control information message.

[0204] In some examples, the sidelink control information message includes a second stage sidelink control information message for UE coordination.

[0205] In some examples, measurement resource component 1255 may be configured to provide or support means for transmitting zero power resources to a receiving UE using channel measurement resources, interference measurement resources, or both.

[0206] In some examples, the measurement resource trigger initiating component 1275 may be configured to provide or support means for determining a trigger to transmit to cause a receiving UE to transmit an indication of channel measurement resources and interference measurement resources.

[0207] In some examples, to support determining a trigger to transmit, the measured resource trigger initiating component 1275 may be configured to provide or support a means for determining a trigger to transmit based on a channel busy rate measurement, a number of consecutive transmission failures satisfying a threshold, or a combination thereof.

[0208] In some examples, the channel measurement resources and the interference measurement resources are part of a channel state information reference signal configuration.

[0209] In some examples, the channel measurement resources and interference measurement resources 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.

[0210] In some examples, the set of transmission parameters includes transmission scheduling adjustments, transmit power, transmit time, indications of time-frequency resources, or a combination thereof.

[0211] Fig.13 A diagram of a system 1300 including a device 1305 supporting unicast coordination for SDM communications in accordance with various aspects of the present disclosure is shown. The device 1305 may be an example of a device 1005, a device 1105, or a UE 115 as described herein or include components of these devices. The device 1305 may communicate wirelessly with one or more base stations 105, UE 115, or any combination thereof. The device 1305 may include components for two-way voice and data communications, including components for transmitting and receiving communications, including a communication manager 1310, an I / O controller 1315, a transceiver 1320, an antenna 1325, a memory 1330, a code 1335, and a processor 1340. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., bus 1345).

[0212] I / O controller 1315 can manage input and output signals for device 1305. I / O controller 1315 can also manage peripheral devices that are not integrated into device 1305. In some cases, I / O controller 1315 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 1315 can utilize an operating system, such as or another known operating system. In some other cases, I / O controller 1315 may represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, I / O controller 1315 may be implemented as part of a processor (such as processor 1340). In some cases, a user may interact with device 1305 via I / O controller 1315 or via hardware components controlled by I / O controller 1315.

[0213] In some cases, the device 1305 may include a single antenna 1325. However, in some other cases, the device 1305 may have more than one antenna 1325, which may be capable of transmitting or receiving multiple wireless transmissions concurrently. The transceiver 1320 may communicate bidirectionally via one or more antennas 1325, a wired or wireless link, as described herein. For example, the transceiver 1320 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 1320 may also include a modem to modulate packets and provide the modulated packets to one or more antennas 1325 for transmission, and demodulate packets received from one or more antennas 1325. The transceiver 1320, or the transceiver 1320 and one or more antennas 1325 may be examples of transmitters 1015, transmitters 1115, receivers 1010, receivers 1110, or any combination thereof, or components thereof as described herein.

[0214] Memory 1330 may include random access memory (RAM) and read-only memory (ROM). Memory 1330 may store computer-readable, computer-executable code 1335 including instructions that, when executed by processor 1340, cause device 1305 to perform various functions described herein. Code 1335 may be stored in a non-transitory computer-readable medium, such as system memory or other types of memory. In some cases, code 1335 may not be directly executed by processor 1340, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein. In some cases, memory 1330 may include, among other things, a basic I / O system (BIOS), which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0215] The processor 1340 may include an intelligent hardware device (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor 1340 may be configured to operate a memory array using a memory controller. In some other cases, the memory controller may be integrated into the processor 1340. The processor 1340 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1330) so that the device 1305 performs various functions (e.g., functions or tasks supporting unicast coordination for SDM communications). For example, the device 1305 or a component of the device 1305 may include a processor 1340 and a memory 1330 coupled to the processor 1340, the processor 1340 and the memory 1330 being configured to perform the various functions described herein.

[0216] The communication manager 1310 may support wireless communication at a receiving UE according to the examples disclosed herein. For example, the communication manager 1310 may be configured to provide or support a device for establishing a set of multiple unicast connections with a group of multiple transmitting UEs, the group of multiple transmitting UEs including one or more first transmitting UEs connected to a first transmission reception point of the receiving UE via a corresponding unicast connection in the group of multiple unicast connections, and one or more second transmitting UEs connected to a second transmission reception point of the receiving UE via a corresponding unicast connection in the group of multiple unicast connections. The communication manager 1310 may be configured to provide or support a device for determining a set of multiple transmission parameter sets for the group of multiple transmitting UEs, the set of multiple transmission parameter sets enabling the receiving UE to receive transmissions from the group of multiple transmitting UEs on the same set of time-frequency resources via an SDM scheme. The communication manager 1310 may be configured to provide or support a device for transmitting each transmission parameter set in the set of multiple transmission parameter sets to a corresponding transmitting UE in the group of multiple transmitting UEs.

[0217] Additionally or alternatively, the communication manager 1310 may support wireless communications at a transmitting UE according to the examples disclosed herein. For example, the communication manager 1310 may be configured to provide or support a means for transmitting to a receiving UE a request to establish a unicast connection with a first transmitting reception point among a plurality of transmitting reception points of the receiving UE. The communication manager 1310 may be configured to provide or support a means for receiving from the receiving UE a set of transmission parameters for subsequent communications on the unicast connection, the set of transmission parameters enabling the receiving UE to receive transmissions from a group of multiple transmitting UEs including the transmitting UE on the same set of time-frequency resources via an SDM scheme.

[0218] By including or configuring the communication manager 1310 according to the examples described herein, the device 1305 can support techniques for improving communication reliability, more efficiently utilizing communication resources, and improving coordination between devices. For example, the determined transmission parameter set can enable multiple transmitting UEs to use the same set of time-frequency resources (e.g., more efficiently using communication resources) when transmitting messages to receiving UEs, where the receiving UE receives the message according to the SDM scheme based on the transmission parameter set. In addition, the determined transmission parameter set can reduce the chance of messages interfering with each other, thereby improving reliability.

[0219] In some examples, the communication manager 1310 may be configured to perform various operations (e.g., receive, monitor, transmit) using or otherwise in cooperation with the transceiver 1320, one or more antennas 1325, or any combination thereof. Although the communication manager 1310 is illustrated as a separate component, in some examples, one or more functions described with reference to the communication manager 1310 may be supported or performed by the processor 1340, the memory 1330, the code 1335, or any combination thereof. For example, the code 1335 may include instructions that are executable by the processor 1340 to cause the device 1305 to perform various aspects of unicast coordination for SDM communications as described herein, or the processor 1340 and the memory 1330 may be otherwise configured to perform or support such operations.

[0220] Fig.14 1 is a flow chart illustrating a method 1400 for supporting unicast coordination for SDM communication according to aspects of the present disclosure. The operations of the method 1400 may be implemented by a receiving UE or components thereof as described herein. For example, the operations of the method 1400 may be implemented by reference to Figures 1 to 13 The described receiving UE 115 is performed. In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0221] At 1405, 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 a receiving UE via a corresponding unicast connection in 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 a corresponding unicast connection in the set of multiple unicast connections. The operations of 1405 may be performed according to the methods described herein. In some examples, aspects of the operations of 1405 may be performed by reference to Fig.12 The described unicast connection establishment component 1225 is performed.

[0222] At 1410, the method may include determining a set of multiple transmission parameter sets for the group of multiple transmitting UEs, the set of multiple transmission parameter sets enabling the receiving UE to receive transmissions from the group of multiple transmitting UEs on the same set of time-frequency resources via the SDM scheme. The operations of 1410 may be performed according to the methods described herein. In some examples, aspects of the operations of 1410 may be described with reference to Fig.12 The transmission parameter determination component 1230 described above is executed.

[0223] At 1415, the method may include transmitting each transmission parameter set in the set of multiple transmission parameter sets to a corresponding transmitting UE in the set of multiple transmitting UEs. The operations of 1415 may be performed according to the methods described herein. In some examples, aspects of the operations of 1415 may be described with reference to Fig.12 The described transmission parameters instruct component 1235 to execute.

[0224] Fig.15 1 is a flowchart illustrating a method 1500 for supporting unicast coordination for SDM communication according to aspects of the present disclosure. The operations of the method 1500 may be implemented by a receiving UE or components thereof as described herein. For example, the operations of the method 1500 may be implemented by reference to Figures 1 to 13 The described receiving UE 115 is performed. In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0225] At 1505, 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 a receiving UE via a corresponding unicast connection in 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 a corresponding unicast connection in the set of multiple unicast connections. The operations of 1505 may be performed according to the methods described herein. In some examples, aspects of the operations of 1505 may be performed by reference to Fig.12 The described unicast connection establishment component 1225 is performed.

[0226] At 1510, the method may include determining a set of multiple transmission parameter sets for the group of multiple transmitting UEs, the set of multiple transmission parameter sets enabling the receiving UE to receive transmissions from the group of multiple transmitting UEs on the same set of time-frequency resources via the SDM scheme. The operations of 1510 may be performed according to the methods described herein. In some examples, aspects of the operations of 1510 may be described with reference to Fig.12The transmission parameter determination component 1230 described above is executed.

[0227] At 1515, the method may include transmitting each transmission parameter set in the set of multiple transmission parameter sets to a corresponding transmitting UE in the set of multiple transmitting UEs. The operations of 1515 may be performed according to the methods described herein. In some examples, aspects of the operations of 1515 may be described with reference to Fig.12 The described transmission parameters instruct component 1235 to execute.

[0228] At 1520, the method may include transmitting each transmission parameter set to a corresponding transmitting UE via a sidelink control information message. The operations of 1520 may be performed according to the methods described herein. In some examples, aspects of the operations of 1520 may be described with reference to Fig.12 The described transmission parameters instruct component 1235 to execute.

[0229] Fig.16 1 is a flow chart illustrating a method 1600 for supporting unicast coordination for SDM communication according to aspects of the present disclosure. The operations of the method 1600 may be implemented by a receiving UE or components thereof as described herein. For example, the operations of the method 1600 may be implemented by reference to Figures 1 to 13 The described receiving UE 115 is performed. In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0230] At 1605, 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 a receiving UE via a corresponding unicast connection in 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 a corresponding unicast connection in the set of multiple unicast connections. The operations of 1605 may be performed according to the methods described herein. In some examples, aspects of the operations of 1605 may be performed by reference to Fig.12 The described unicast connection establishment component 1225 is performed.

[0231] At 1610, the method may include determining a set of multiple transmission parameter sets for the group of multiple transmitting UEs, the set of multiple transmission parameter sets enabling the receiving UE to receive transmissions from the group of multiple transmitting UEs on the same set of time-frequency resources via the SDM scheme. The operations of 1610 may be performed according to the methods described herein. In some examples, aspects of the operations of 1610 may be described with reference to Fig.12 The transmission parameter determination component 1230 described above is executed.

[0232] At 1615, the method may include transmitting each transmission parameter set in the set of multiple transmission parameter sets to a corresponding transmitting UE in the set of multiple transmitting UEs. The operations of 1615 may be performed according to the methods described herein. In some examples, aspects of the operations of 1615 may be described with reference to Fig.12 The described transmission parameters instruct component 1235 to execute.

[0233] At 1620, the method may include transmitting an indication of a control demodulation reference signal cyclic shift to the respective transmitting UEs for use by each transmitting UE in transmitting communications to the receiving UE, wherein the control demodulation reference signal cyclic shift further enables the receiving UE to receive transmissions from the group of multiple transmitting UEs on the same set of time-frequency resources via the SDM scheme. The operations of 1620 may be performed according to the methods described herein. In some examples, aspects of the operations of 1620 may be performed by reference to Fig.12 The DMRS cyclic shift indication component 1250 is described to perform.

[0234] Fig.17 1 is a flowchart illustrating a method 1700 for supporting unicast coordination for SDM communication according to aspects of the present disclosure. The operations of the method 1700 may be implemented by a receiving UE or components thereof as described herein. For example, the operations of the method 1700 may be implemented by reference to Figures 1 to 13 The described receiving UE 115 is performed. In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0235] At 1705, 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 a receiving UE via a corresponding unicast connection in 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 a corresponding unicast connection in the set of multiple unicast connections. The operations of 1705 may be performed according to the methods described herein. In some examples, aspects of the operations of 1705 may be performed by reference to Fig.12 The described unicast connection establishment component 1225 is performed.

[0236] At 1710, the method may include determining a set of multiple transmission parameter sets for the group of multiple transmitting UEs, the set of multiple transmission parameter sets enabling the receiving UE to receive transmissions from the group of multiple transmitting UEs on the same set of time-frequency resources via the SDM scheme. The operations of 1710 may be performed according to the methods described herein. In some examples, aspects of the operations of 1710 may be described with reference to Fig.12 The transmission parameter determination component 1230 described above is executed.

[0237] At 1715, the method may include transmitting each transmission parameter set in the set of multiple transmission parameter sets to a corresponding transmitting UE in the set of multiple transmitting UEs. The operations of 1715 may be performed according to the methods described herein. In some examples, aspects of the operations of 1715 may be described with reference to Fig.12 The described transmission parameters instruct component 1235 to execute.

[0238] At 1720, the method may include transmitting an indication of a channel measurement resource and an interference measurement resource to a corresponding transmitting UE. The operations of 1720 may be performed according to the methods described herein. In some examples, aspects of the operations of 1720 may be described with reference to Fig.12 The measurement resource component 1255 described above is performed.

[0239] At 1725, the method may include estimating channel measurements and interference measurements for each transmit-receive point for transmissions from the group of multiple transmitting UEs on the same set of time-frequency resources based on the indication of the channel measurement resources and the interference measurement resources, wherein the transmissions from the group of multiple transmitting UEs are received based on the estimation. The operations of 1725 may be performed according to the methods described herein. In some examples, aspects of the operations of 1725 may be described with reference to Fig.12 The measurement resource component 1255 described above is performed.

[0240] Fig.18 1 is a flowchart illustrating a method 1800 for supporting unicast coordination for SDM communication according to aspects of the present disclosure. The operations of the method 1800 may be implemented by a transmitting UE or components thereof as described herein. For example, the operations of the method 1800 may be implemented by reference to Figures 1 to 13 The described transmitting UE 115 is performed. In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0241] At 1805, the method may include transmitting to a receiving UE a request to establish a unicast connection with a first transmission reception point among a plurality of transmission reception points of the receiving UE. The operations of 1805 may be performed according to the methods described herein. In some examples, aspects of the operations of 1805 may be described by reference to Fig.12 The unicast connection request component 1240 described above is executed.

[0242] At 1810, the method may include receiving, from a receiving UE, a set of transmission parameters for subsequent communications on the unicast connection, the set of transmission parameters enabling the receiving UE to receive transmissions from a group of multiple transmitting UEs including the transmitting UE on the same set of time-frequency resources via an SDM scheme. The operations of 1810 may be performed according to the methods described herein. In some examples, aspects of the operations of 1810 may be described with reference to Fig.12 The transmission parameter receiving component 1245 described is executed.

[0243] Fig.19 1 is a flowchart illustrating a method 1900 for supporting unicast coordination for SDM communication according to various aspects of the present disclosure. The operations of the method 1900 may be implemented by a transmitting UE or components thereof as described herein. For example, the operations of the method 1900 may be implemented by reference to Figures 1 to 13 The described transmitting UE 115 is performed. In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0244] At 1905, the method may include transmitting to a receiving UE a request to establish a unicast connection with a first transmission reception point among a plurality of transmission reception points of the receiving UE. The operations of 1905 may be performed according to the methods described herein. In some examples, aspects of the operations of 1905 may be described with reference to Fig.12 The unicast connection request component 1240 described above is executed.

[0245] At 1910, the method may include receiving, from a receiving UE, a set of transmission parameters for subsequent communications on the unicast connection, the set of transmission parameters enabling the receiving UE to receive transmissions from a group of multiple transmitting UEs including the transmitting UE on the same set of time-frequency resources via an SDM scheme. The operations of 1910 may be performed according to the methods described herein. In some examples, aspects of the operations of 1910 may be described with reference to Fig.12 The transmission parameter receiving component 1245 described is executed.

[0246] At 1915, the method may include receiving a set of transmission parameters from a receiving UE via a sidelink control information message. The operations of 1915 may be performed according to the methods described herein. In some examples, aspects of the operations of 1915 may be described with reference to Fig.12 The transmission parameter receiving component 1245 described is executed.

[0247] It should be noted that the methods described herein describe possible implementations, and that the various operations and steps may be rearranged or otherwise modified and other implementations are possible. Furthermore, aspects from two or more methods may be combined.

[0248] Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for example purposes, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein may also be applicable to networks other than LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques may be applied to various other wireless communication 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, and other systems and radio technologies not explicitly mentioned herein.

[0249] The information and signals described herein may be represented using any of a variety of different techniques and technologies. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout this description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0250] The various illustrative blocks and components described in conjunction 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. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

[0251] 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 by a computer-readable medium as one or more instructions or codes. Other examples and implementations fall within the scope of the present disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination thereof. Features that implement the functions may also be physically located in various locations, including being distributed so that parts of the functions are implemented at different physical locations.

[0252] Computer-readable medium includes both non-transient computer storage medium and communication medium, and it includes any medium that facilitates computer program to transfer from one place to another place.Non-transient storage medium can be any available medium that can be accessed by general or special-purpose computer.As an example and not limitation, non-transient computer-readable medium can 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, disk storage or other magnetic storage device, or can be used to carry or store instruction or data structure form of desired program code means and can be accessed by general or special-purpose computer or general or special-purpose processor any other non-transient medium.Similarly, any connection is also properly referred to as computer-readable medium.For example, if software is transmitted from website, server or other remote source using coaxial cable, optical fiber cable, twisted pair, digital subscriber line (DSL) or wireless technology such as infrared, radio and microwave, then the coaxial cable, optical fiber cable, twisted pair, DSL or wireless technology such as infrared, radio and microwave are just included in the definition of computer-readable medium. Disk and disc as used herein include CDs, laser discs, optical discs, digital versatile discs (DVDs), floppy disks, and Blu-ray discs, 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.

[0253] As used herein (including in the claims), "or" used in a list of items (e.g., a list of items with a phrase such as "at least one of" or "one or more of") indicates an inclusive list, so 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). Similarly, as used herein, the phrase "based on" should not be interpreted as referring to a closed set of conditions. For example, an example step described as "based on condition A" may be based on both condition A and condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on."

[0254] In the accompanying drawings, similar components or features may have the same reference number. In addition, various components of the same type may be distinguished by following the reference number with a dash and a second reference number that distinguishes between similar components. If only the first reference number is used in the specification, the description may apply to any of the similar components having the same first reference number regardless of the second reference number, or other subsequent reference numbers.

[0255] The descriptions set forth herein in conjunction with the accompanying drawings describe example configurations and do not represent all examples that may be implemented or that fall within the scope of the claims. The term "example" as used herein means "used as an example, instance, or illustration" and does not mean "better than" or "better than other examples." This detailed description includes specific details to provide an understanding of the described techniques. However, these techniques may be practiced without these specific details. In some instances, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0256] The description herein is provided to enable one of ordinary skill in the art to make or use the present disclosure. Various modifications to the present disclosure will be apparent to one of ordinary skill in the art, and the universal principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Thus, the present disclosure is not limited to the examples and designs described herein, but should be granted the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a receiving user equipment (UE), comprising: establishing a plurality of unicast connections with a plurality of transmitting UEs, the plurality of transmitting UEs comprising one or more first transmitting UEs connected to a first transmission reception point of the receiving UE via corresponding unicast connections in the plurality of unicast connections, and one or more second transmitting UEs connected to a second transmission reception point of the receiving UE via corresponding unicast connections in the plurality of unicast connections; determining a plurality of transmission parameter sets for the plurality of transmitting UEs, the plurality of transmission parameter sets enabling the receiving UE to receive transmissions from the plurality of transmitting UEs on the same set of time-frequency resources via a space division multiplexing scheme; as well as Each transmission parameter set of the plurality of transmission parameter sets is transmitted to a corresponding transmitting UE of the plurality of transmitting UEs.

2. The method of claim 1, wherein: Transmitting each transmission parameter set to the corresponding transmitting UE comprises: Each transmission parameter set is transmitted to the corresponding transmitting UE via a sidelink control information message, wherein each transmission parameter set is indicated via a resource bit map in the sidelink control information message, and the sidelink control information message comprises a second stage sidelink control information message.

3. The method of claim 1, further comprising: An indication of a control demodulation reference signal cyclic shift is transmitted to the respective transmitting UEs for use by each transmitting UE when transmitting communications to the receiving UE, wherein the control demodulation reference signal cyclic shift further enables the receiving UE to receive transmissions from the multiple transmitting UEs on the same set of time-frequency resources via the spatial division multiplexing scheme.

4. The method of claim 3, wherein: Transmitting an indication of a cyclic shift of the control demodulation reference signal includes: An indication of the control demodulation reference signal cyclic shift is transmitted to the corresponding transmitting UE via a sidelink control information message.

5. The method of claim 4, wherein: The sidelink control information message includes a second stage sidelink control information message for UE coordination.

6. A method for wireless communication at a transmitting user equipment (UE), comprising: transmitting, to a receiving UE, a request to establish a unicast connection with a first transmission reception point among a plurality of transmission reception points of the receiving UE; as well as A set of transmission parameters to be used for subsequent communications on the unicast connection is received from the receiving UE, the set of transmission parameters enabling the receiving UE to receive transmissions from multiple transmitting UEs including the transmitting UE on the same set of time-frequency resources via a spatial division multiplexing scheme.

7. The method of claim 6, wherein: Receiving the transmission parameter set includes: The transmission parameter set is received from the receiving UE via a sidelink control information message, wherein the transmission parameter set is indicated via a resource bitmap in the sidelink control information message, and the sidelink control information message comprises a second stage sidelink control information message.

8. The method of claim 6, further comprising: An indication of a control demodulation reference signal cyclic shift to be used for the subsequent communication is received from the receiving UE, wherein the control demodulation reference signal cyclic shift further enables the receiving UE to receive transmissions from the multiple transmitting UEs on the same set of time-frequency resources via the spatial division multiplexing scheme.

9. The method of claim 8, wherein: Receiving an indication of cyclic shift of the control demodulation reference signal includes: An indication of a cyclic shift of the control demodulation reference signal is received from the receiving UE via a sidelink control information message.

10. The method of claim 9, wherein: The sidelink control information message includes a second stage sidelink control information message for UE coordination.

11. An apparatus for wireless communication at a receiving user equipment (UE), comprising: processor; a memory coupled to the processor; as well as instructions stored in the memory, the instructions being executable by the processor to cause the apparatus to: establishing a plurality of unicast connections with a plurality of transmitting UEs, the plurality of transmitting UEs comprising one or more first transmitting UEs connected to a first transmission reception point of the receiving UE via corresponding unicast connections in the plurality of unicast connections, and one or more second transmitting UEs connected to a second transmission reception point of the receiving UE via corresponding unicast connections in the plurality of unicast connections; determining a plurality of transmission parameter sets for the plurality of transmitting UEs, the plurality of transmission parameter sets enabling the receiving UE to receive transmissions from the plurality of transmitting UEs on the same set of time-frequency resources via a space division multiplexing scheme; as well as Each transmission parameter set of the plurality of transmission parameter sets is transmitted to a corresponding transmitting UE of the plurality of transmitting UEs.

12. The device of claim 11, wherein: The instructions for transmitting each transmission parameter set to the corresponding transmitting UE are executable by the processor to cause the apparatus to: Each transmission parameter set is transmitted to the corresponding transmitting UE via a sidelink control information message, wherein each transmission parameter set is indicated via a resource bit map in the sidelink control information message, and the sidelink control information message comprises a second stage sidelink control information message.

13. The apparatus of claim 11, wherein the instructions are further executable by the processor to cause the apparatus to: An indication of a control demodulation reference signal cyclic shift is transmitted to the respective transmitting UEs for use by each transmitting UE when transmitting communications to the receiving UE, wherein the control demodulation reference signal cyclic shift further enables the receiving UE to receive transmissions from the multiple transmitting UEs on the same set of time-frequency resources via the spatial division multiplexing scheme.

14. The device of claim 13, wherein: The instructions for transmitting an indication of a cyclic shift of the control demodulation reference signal are executable by the processor to cause the apparatus to: An indication of the control demodulation reference signal cyclic shift is transmitted to the corresponding transmitting UE via a sidelink control information message.

15. The device of claim 14, wherein: The sidelink control information message includes a second stage sidelink control information message for UE coordination.

16. The apparatus of claim 11, wherein the instructions are further executable by the processor to cause the apparatus to: transmitting an indication of a channel measurement resource and an interference measurement resource to the corresponding transmitting UE; and Based at least in part on the indication of the channel measurement resources and the interference measurement resources, channel measurements and interference measurements for each transmit-receive point are estimated for the transmissions from the multiple transmitting UEs on the same set of time-frequency resources, wherein the transmissions from the multiple transmitting UEs are received based at least in part on the estimation.

17. The device of claim 16, wherein: The instructions for transmitting an indication of the channel measurement resources and the interference measurement resources are executable by the processor to cause the apparatus to: An indication of the channel measurement resource and the interference measurement resource is transmitted to each transmitting UE via a sidelink control information message.

18. The device of claim 17, wherein: The sidelink control information message includes a second stage sidelink control information message for UE coordination.

19. The apparatus of claim 16, wherein the instructions are further executable by the processor to cause the apparatus to: Zero power resources are received from one or more transmitting UEs of the plurality of transmitting UEs for the channel measurement resources, the interference measurement resources, or both, wherein estimating the interference measurement is based at least in part on measuring the zero power resources.

20. The apparatus of claim 11, wherein the instructions are further executable by the processor to cause the apparatus to: The multiple transmitting UEs are selected to establish the multiple unicast connections based at least in part on detecting a sidelink control information message from each of the multiple transmitting UEs, performing a signal quality measurement for each transmitting UE among the first transmission reception point and the second transmission reception point of the receiving UE, or a combination thereof.

21. The device of claim 11, wherein: The instructions for determining the plurality of transmission parameter sets are executable by the processor to cause the apparatus to: The plurality of transmission parameter sets for respective ones of the plurality of transmitting UEs are determined based at least in part on which transmit reception point of the receiving UE is used for respective unicast connections with the transmitting UEs of the plurality of transmitting UEs.

22. The device of claim 21, wherein: At least partially based on establishing a first unicast connection between the first transmitting UE and the receiving UE via the first transmitting reception point and establishing a second unicast connection between the second transmitting UE and the receiving UE via the second transmitting reception point, the same set of transmission parameters is used for the first transmitting UE and the second transmitting UE among the multiple transmitting UEs.

23. The device of claim 11, wherein: The instructions for determining the plurality of transmission parameter sets are executable by the processor to cause the apparatus to: The plurality of sets of transmission parameters are determined based at least in part on one or more signal quality measurements of the plurality of unicast connections.

24. The device of claim 23, wherein: The one or more signal quality measurements include a reference signal strength indicator measurement, a reference signal received power measurement, bias information for each of the plurality of transmitting UEs, or a combination thereof.

25. The apparatus of claim 11, wherein: Each set of transmission parameters includes a transmission scheduling adjustment, a transmit power, a transmit time, an indication of time-frequency resources, or a combination thereof.

26. An apparatus for wireless communication at a transmitting user equipment (UE), comprising: processor; a memory coupled to the processor; as well as instructions stored in the memory, the instructions being executable by the processor to cause the apparatus to: transmitting, to a receiving UE, a request to establish a unicast connection with a first transmission reception point among a plurality of transmission reception points of the receiving UE; as well as A set of transmission parameters to be used for subsequent communications on the unicast connection is received from the receiving UE, the set of transmission parameters enabling the receiving UE to receive transmissions from multiple transmitting UEs including the transmitting UE on the same set of time-frequency resources via a spatial division multiplexing scheme.

27. The device of claim 26, wherein: The instructions for receiving the set of transmission parameters are executable by the processor to cause the apparatus to: The transmission parameter set is received from the receiving UE via a sidelink control information message, wherein the transmission parameter set is indicated via a resource bitmap in the sidelink control information message, and the sidelink control information message comprises a second stage sidelink control information message.

28. The apparatus of claim 26, wherein the instructions are further executable by the processor to cause the apparatus to: An indication of a control demodulation reference signal cyclic shift to be used for the subsequent communication is received from the receiving UE, wherein the control demodulation reference signal cyclic shift further enables the receiving UE to receive transmissions from the multiple transmitting UEs on the same set of time-frequency resources via the spatial division multiplexing scheme.

29. The apparatus of claim 28, wherein: The instructions for receiving an indication of a cyclic shift of the control demodulation reference signal are executable by the processor to cause the apparatus to: An indication of a cyclic shift of the control demodulation reference signal is received from the receiving UE via a sidelink control information message.

30. The apparatus of claim 29, wherein: The sidelink control information message includes a second stage sidelink control information message for UE coordination.

31. The apparatus of claim 26, wherein the instructions are further executable by the processor to cause the apparatus to: An indication of channel measurement resources and interference measurement resources for the subsequent communication is received from the receiving UE.

32. The apparatus of claim 31, wherein: The instructions for receiving an indication of the channel measurement resource and the interference measurement resource are executable by the processor to cause the apparatus to: An indication of the channel measurement resource and the interference measurement resource is received from the receiving UE via a sidelink control information message.

33. The apparatus of claim 32, wherein: The sidelink control information message includes a second stage sidelink control information message for UE coordination.

34. The apparatus of claim 31, wherein the instructions are further executable by the processor to cause the apparatus to: Zero power resources are transmitted to the receiving UE using the channel measurement resources, the interference measurement resources, or both.

35. The apparatus of claim 26, wherein: The set of transmission parameters includes transmission scheduling adjustment, transmission power, transmission time, indication of time-frequency resources, or a combination thereof.

Images