Scheduling based on sidelink multicast reachability

Abstract

Methods, systems, and devices for wireless communications are described in which a user equipment (UE) in a UE group can communicate with other members of the group to provide data or other information via a sidelink. The UE can send a multicast sidelink request to a base station. After receiving the sidelink request, the base station can send a sidelink grant (e.g., a send or receive grant) in a downlink control information (DCI) to the UEs in the sidelink multicast communication group. The sidelink grant can include information for each hop, such as which UEs are to transmit or receive, the UE's receive or transmit beams, time and frequency resources, or data to be forwarded or relayed. In some examples, the UE can relay information to other UEs in the sidelink multicast communication group.

Description

[0001] Cross-references

[0002] This patent application claims the benefit of U.S. Provisional Patent Application No. 62 / 925,687, entitled “Sidelink Groupcast Reachability Based Scheduling,” filed by Ryu et al. on October 24, 2019, and U.S. Patent Application No. 17 / 072,022, entitled “Sidelink Groupcast Reachability Based Scheduling,” filed by Ryu et al. on October 15, 2020; each of which is assigned to the present assignee. Background Art

[0003] The following relates generally to wireless communications, and more particularly to managing sidelink-based communications.

[0004] 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, LTE advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems (which may be referred to as new radio (NR) systems). These systems may use techniques 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). A wireless multiple access communication system may include one or more base stations or one or more network access nodes, each of which simultaneously supports communication with multiple communication devices, which may be referred to as user equipment (UE).

[0005] The UE may use beamforming technology to communicate with a base station or other UEs. The UE may have multiple panels (e.g., antenna modules, antenna arrays) that are used to form communication beams (e.g., receive beams or transmit beams) to communicate with a base station or other UEs. In some cases, the receive beams and transmit beams of a communication device may not be aligned or may interfere with each other (e.g., between different devices), which may cause communication failure. Summary of the invention

[0006] A method for wireless communication at a base station is described. The method may include receiving a sidelink scheduling request for multicast communication between a first user equipment (UE) in a UE group supported by the base station and the first UE and the UE group, determining a first time resource for transmitting a multicast sidelink message from the first UE to a second UE in the UE group and a second time resource for transmitting a multicast sidelink message from the second UE to a third UE in the UE group based on a beam training report associated with a beam training process between the first UE and one or more other UEs in the UE group, and sending a multicast sidelink grant indicating the first and second time resources.

[0007] An apparatus for wireless communication at a base station is described. The apparatus may include a processor, a memory coupled to the processor, the processor and the memory configured to receive a sidelink scheduling request for multicast communication between a first UE in a UE group supported by the base station and the first UE and the UE group, determine a first time resource for transmitting a multicast sidelink message from the first UE to a second UE in the UE group and a second time resource for transmitting a multicast sidelink message from the second UE to a third UE in the UE group based on a beam training report associated with a beam training process between the first UE and one or more other UEs in the UE group, and send a multicast sidelink grant indicating the first and second time resources.

[0008] Another apparatus for wireless communication at a base station is described. The apparatus may include components for receiving a sidelink scheduling request for multicast communication between a first UE in a UE group supported by the base station and the UE group, determining a first time resource for transmitting a multicast sidelink message from the first UE to a second UE in the UE group and a second time resource for transmitting a multicast sidelink message from the second UE to a third UE in the UE group based on a beam training report associated with a beam training process between the first UE and one or more other UEs in the UE group, and sending a multicast sidelink grant indicating the first and second time resources.

[0009] A non-transitory computer-readable medium storing code for wireless communication at a base station is described. The code may include instructions executable by a processor to receive a sidelink scheduling request for multicast communication between a first UE in a UE group supported by the base station and the UE group, determine a first time resource for transmitting a multicast sidelink message from the first UE to a second UE in the UE group and a second time resource for transmitting a multicast sidelink message from the second UE to a third UE in the UE group based on a beam training report associated with a beam training process between the first UE and one or more other UEs in the UE group, and send a multicast sidelink grant indicating the first and second time resources.

[0010] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for receiving a beam training report from a first UE, receiving a second beam training report from a second UE, the second beam training report being associated with a second beam training process between the second UE and at least one other UE, and determining the first and second time resources based on the second beam training report.

[0011] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the at least one other UE includes a first UE, a second UE, or another UE.

[0012] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, components, or instructions for generating a connection map associated with a UE group based on a beam training report, wherein the connection map indicates a link quality between two or more UEs in the UE group, and determining a first and a second time resource based on the connection map.

[0013] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a connection map indicates transmit beam and receive beam link qualities between two or more UEs.

[0014] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a first time resource may be associated with a first hop of a multi-hop transmission of a multicast sidelink message and a second time resource may be associated with a second hop of the multi-hop transmission of the multicast sidelink message.

[0015] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for determining a first transmit beam for a first UE based on a beam training report for transmitting a multicast sidelink message to a second UE, and determining a second transmit beam for the second UE based on the beam training report for transmitting a multicast sidelink message to a third UE.

[0016] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for determining a first receive beam for a second UE based on a beam training report for receiving a multicast side link message from the first UE, and determining a second receive beam for a third UE based on the beam training report for receiving a multicast side link message from the second UE.

[0017] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a first transmit and receive beam may be specific to a first hop of a multi-hop transmission of a multicast sidelink message, and a second transmit and receive beam may be specific to a second hop of the multi-hop transmission of the multicast sidelink message.

[0018] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending a multicast sidelink grant to the first UE, the second UE, at least one other UE, or any combination thereof.

[0019] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a multicast sidelink grant may be sent via radio resource control (RRC) signaling, a media access control (MAC) control element (MAC-CE), a downlink control information (DCI) transmission, or any combination thereof.

[0020] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the sidelink scheduling request includes a group identifier associated with the UE group, an identifier of the first UE, one or more transmit beams for the multicast sidelink message, a corresponding identifier of each UE in the UE group, an amount of data corresponding to the multicast sidelink message, or any combination thereof.

[0021] A method for wireless communication at a second UE is described. The method may include sending a beam training report to a base station based on a beam training process between two or more UEs in a UE group supported by the base station, receiving a multicast side link grant from the base station based on the beam training report, the multicast side link grant indicating a first time resource for transmitting a multicast side link message from a first UE to a second UE and a second time resource for transmitting a multicast side link message from the second UE to a third UE, receiving a multicast side link message from the first UE via the first time resource, and sending the multicast side link message received from the first UE to the third UE via the second time resource.

[0022] An apparatus for wireless communication at a second UE is described. The apparatus may include a processor, a memory coupled to the processor, the processor and the memory configured to send a beam training report to a base station based on a beam training process between two or more UEs in a UE group supported by the base station, receive a multicast side link grant from the base station based on the beam training report, the multicast side link grant indicating a first time resource for transmitting a multicast side link message from a first UE to a second UE and a second time resource for transmitting a multicast side link message from the second UE to a third UE, receive a multicast side link message from the first UE via the first time resource, and send the multicast side link message received from the first UE to the third UE via the second time resource.

[0023] Another apparatus for wireless communication at a second UE is described. The apparatus may include means for sending a beam training report to a base station based on a beam training procedure between two or more UEs in a UE group supported by the base station, receiving a multicast sidelink grant from the base station based on the beam training report, the multicast sidelink grant indicating a first time resource for transmitting a multicast sidelink message from a first UE to a second UE and a second time resource for transmitting the multicast sidelink message from the second UE to a third UE, receiving a multicast sidelink message from the first UE via the first time resource, and sending the multicast sidelink message received from the first UE to the third UE via the second time resource.

[0024] A non-transitory computer-readable medium storing code for wireless communication at a second UE is described. The code may include instructions executable by a processor to send a beam training report to a base station based on a beam training process between two or more UEs in a UE group supported by the base station, receive a multicast sidelink grant from the base station based on the beam training report, the multicast sidelink grant indicating a first time resource for transmitting a multicast sidelink message from a first UE to a second UE and a second time resource for transmitting the multicast sidelink message from the second UE to a third UE, receive a multicast sidelink message from the first UE via the first time resource, and send the multicast sidelink message received from the first UE to the third UE via the second time resource.

[0025] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for determining a receive beam for receiving a multicast side link message from a first UE based on a multicast side link grant, and monitoring a first time resource for the multicast side link message using the receive beam.

[0026] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for determining a transmit beam for transmitting a multicast side link message to a third UE based on a multicast side link grant, and sending the multicast side link message via a second time resource using the transmit beam.

[0027] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving a multicast sidelink grant via RRC signaling, MAC-CE, DCI transmission, or any combination thereof.

[0028] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the multicast side link grant indicates a relay identifier of a second UE, corresponding reception identifiers of one or more receiving UEs including a third UE, a hop count or identifier for transmission of the multicast side link message by the second UE, a transmit beam for transmission of the multicast side link message by the first UE or the second UE, or any combination thereof.

[0029] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the beam training report indicates one or more of resources for sending training signals, identification of one or more training beams, received signal quality of the training signal received at the second UE, beams used for receiving training signals at the second UE, resources for receiving training signals, or any combination thereof.

[0030] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the beam training report indicates a subset of UEs that are reachable by the second UE, including the third UE. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 An example of a wireless communication system supporting sidelink multicast reachability based scheduling in accordance with one or more aspects of the present disclosure is shown.

[0032] Figure 2 An example of a wireless communication system supporting sidelink multicast reachability based scheduling in accordance with one or more aspects of the present disclosure is shown.

[0033] Figure 3 An example of a wireless communication system supporting sidelink multicast reachability based scheduling in accordance with one or more aspects of the present disclosure is shown.

[0034] Figure 4 An example of a process flow for supporting scheduling based on sidelink multicast reachability according to one or more aspects of the present disclosure is shown.

[0035] Figure 5 and Figure 6 A block diagram of an apparatus supporting sidelink multicast reachability based scheduling in accordance with one or more aspects of the present disclosure is shown.

[0036] Figure 7 A block diagram of a communications manager supporting sidelink multicast reachability based scheduling is shown in accordance with one or more aspects of the present disclosure.

[0037] Figure 8 A diagram of a system including a device supporting sidelink multicast reachability based scheduling is shown in accordance with one or more aspects of the present disclosure.

[0038] Fig. 9and Fig.10 A block diagram of an apparatus supporting sidelink multicast reachability based scheduling in accordance with one or more aspects of the present disclosure is shown.

[0039] Fig.11 A block diagram of a communications manager supporting sidelink multicast reachability based scheduling is shown in accordance with one or more aspects of the present disclosure.

[0040] Fig.12 A diagram of a system including a device supporting sidelink multicast reachability based scheduling is shown in accordance with one or more aspects of the present disclosure.

[0041] Figures 13 to 17 A flow chart illustrating a method of supporting scheduling based on sidelink multicast reachability in accordance with one or more aspects of the present disclosure is shown. DETAILED DESCRIPTION

[0042] A wireless communication system may support access links and side links for communication between wireless devices. An access link may refer to a communication link between a UE and a base station. For example, an access link may support uplink signaling, downlink signaling, a connection process, etc. A side link may refer to any communication link between similar wireless devices (e.g., a communication link between UEs, or a backhaul communication link between base stations). Note that although the various examples provided herein are discussed for UE side link devices, such side link technologies may be used for any type of wireless device using side link communication. For example, a side link may support device-to-device (D2D) communication, vehicle-to-everything (V2X) or vehicle-to-vehicle (V2V) communication, message relay, discovery signaling, beacon signaling, or any combination of these or other signals wirelessly transmitted from one wireless device to one or more other wireless devices.

[0043] As the demand for sidelink communications increases (e.g., due to increased V2X demand for autonomous and semi-autonomous vehicles, D2D communications between Internet of Things (IoT) devices, or factory automation), techniques are needed to effectively and reliably enhance the throughput and reliability of the sidelink channel. In some cases, sidelink multicast communications may be required, where one transmitting device can send a signal to multiple other devices (e.g., a vehicle sending sensor data to multiple other vehicles via sidelink communications). Techniques such as those discussed in various aspects of the present disclosure provide sidelink multicast communications in which directional transmit / receive beams can be identified for wireless communications between devices of a group of sidelink devices. The beam identification can be determined based on one or more measurements made by a sidelink device of a training beam sent by another sidelink device.

[0044] In some cases, the first UE may be a transmitting UE that will send a groupcast sidelink communication to multiple other UEs in the UE group. In addition, the sidelink communication may utilize directional beamforming, where directional beams can be used for communication. In order to determine the preferred directional beam, the UEs of the group may perform a beam training process, in which the first UE sends a series of transmissions using a series of different beams, and multiple other UEs may measure the received signal characteristics of the series of different beams to identify one or more preferred beams. The UE may communicate with a base station or other UEs using beamforming techniques. The UE may have multiple panels (e.g., antenna modules or antenna arrays), each of which is capable of forming a communication beam (e.g., a receive beam or a transmit beam) to communicate with a base station via an access link or with other UEs or integrated access and backhaul (IAB) nodes via a side link. The UE may communicate with a UE group using groupcast or multicast communication techniques on the side link. In some cases, the receive beam of a UE may not be consistent with the transmit beam of another UE on the side link.

[0045] The transmitting UE may send a beam training report to the base station based on the results of the beam training process. The beam training report may indicate the received signal quality of the beam training signal, the receive beams used by the UE group, the available time and frequency resources, the interference detected by the UE when using the receive and transmit beams, the link quality between the UE groups, or the link quality between UEs with receive beams that the transmitting UE may or may not be able to reach through its transmit beam.

[0046] The sending UE may send a multicast side link request to the base station. The multicast side link request may include an identifier (ID) of the UE, a transmit beam of the UE, a receive beam of a receiving UE that is a member of the side link multicast communication group, or the amount of data to be sent by the UE. After receiving the side link request, the base station may send a multicast side link grant (e.g., a send or receive grant) in a DCI to the UEs in the side link multicast communication group. The side link grant may include information for each hop, such as which UEs are to send or receive, which receive or transmit beams to use, available resources, or data to be relayed. In some examples, the UE may relay information (e.g., a multicast side link message) to the UEs in the side link multicast communication group.

[0047] Certain aspects of the subject matter described herein may be implemented to achieve one or more advantages. The described techniques may support advantages such as improved communications using receive and transmit beams, reduced signaling overhead, and improved reliability. Thus, the supported techniques may include improved network operation and, in some examples, increased network efficiency, among other benefits.

[0048] Aspects of the present disclosure are initially described in the context of a wireless communication system. Aspects are then described with respect to a process flow. Aspects of the present disclosure are further illustrated and described by reference to apparatus diagrams, system diagrams, and flow diagrams related to scheduling based on sidelink multicast reachability.

[0049] Figure 1 An example of a wireless communication system 100 supporting scheduling based on sidelink multicast reachability according to one or more aspects of the present disclosure is shown. 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 LTE advanced (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.

[0050] The base stations 105 may be dispersed throughout a geographic area to form the wireless communication system 100, and may be devices of different forms or 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 signal communication according to one or more radio access technologies.

[0051] 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 both, at different times. The UEs 115 may be devices of different forms or with different capabilities. Figure 1 Some example UEs 115 are shown in FIG. Figure 1 As shown, the UE 115 described herein may be able to communicate with various types of devices, such as other UEs 115, base stations 105, or network devices (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network devices).

[0052] The base stations 105 may communicate with the core network 130 or with each other, or both. For example, the base stations 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 both, via the backhaul links 120 (e.g., via X2, Xn, or other interfaces). In some examples, the backhaul links 120 may be or include one or more wireless links.

[0053] The one or more base stations 105 described herein may include or may be referred to by a person of ordinary skill in the art as a base station transceiver, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB), a next generation NodeB or a giga-NodeB (any of which may be referred to as a gNB), a Home NodeB, a Home eNodeB, or other suitable terminology.

[0054] UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where in other examples, a "device" may also be referred to as a unit, a station, a terminal, or a client. 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 home appliances, vehicles, meters, etc.

[0055] like Figure 1 As shown, the UE 115 described herein can communicate with various types of devices, such as other UEs 115 that can sometimes act as relays, as well as base stations 105 and network devices including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, etc.

[0056] The UE 115 and the base station 105 may communicate wirelessly with each other via one or more communication links 125 through 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)) operating 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 communication with the UE 115 using carrier aggregation or multi-carrier operation. The UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used with both frequency division duplex (FDD) and time division duplex (TDD) component carriers.

[0057] 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 based on a channel raster for discovery by UE 115. A carrier may operate in a standalone mode, where initial acquisition and connection may be performed by UE 115 via the carrier, or a carrier may operate in a non-standalone mode, where the connection is anchored using a different carrier (e.g., of the same or different radio access technology).

[0058] 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 FDD mode), or may be configured to carry both downlink and uplink communications (e.g., in TDD mode).

[0059] A carrier may be associated with a specific 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, a carrier bandwidth may be one of several determined bandwidths of a carrier for a specific radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz)). A device of the wireless communication system 100 (e.g., a base station 105, a UE 115, or both) may have a hardware configuration that supports communication on a specific carrier bandwidth or may be configured to support communication on one of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 or a UE 115 that supports simultaneous communication via carriers associated with multiple carrier bandwidths. In some examples, each service UE 115 may be configured to operate on a portion (e.g., a sub-band, a BWP) or all of the carrier bandwidth.

[0060] The signal waveform transmitted through the carrier wave may be composed of multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques, such as OFDM or DFT-S-OFDM). In a system using MCM techniques, a resource element may include a symbol period (e.g., the duration of a modulation symbol) and a subcarrier, where the symbol 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 codec rate of the modulation scheme, or both). Therefore, the more resource elements received by the UE 115 and the higher the order of the modulation scheme, the higher the data rate may be for the UE 115. Wireless communication resources may refer to a combination of radio spectrum resources, time resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers may further increase the data rate or data integrity used to communicate with the UE 115.

[0061] One or more parameter sets for a carrier may be supported, where the parameter set may include subcarrier spacing (Δf) and cyclic prefix. A carrier may be divided into one or more BWPs with the same or different parameter sets. 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.

[0062] The time interval of the base station 105 or the UE 115 can be expressed as a multiple of a basic time unit. For example, the basic time unit can refer to T s =1 / (Δf max ·N f ) seconds sampling period, where Δf max It can represent the maximum supported subcarrier spacing, and N fThe maximum supported discrete Fourier transform (DFT) size may be indicated. The time intervals of the 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).

[0063] Each frame may include multiple consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, the frame may be divided (e.g., in the time domain) into subframes, and each subframe may be further divided into multiple 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 multiple symbol periods (e.g., depending on the length of the cyclic prefix preceding each symbol period). In some wireless communication systems, the time slot may be further divided into multiple mini-slots containing one or more symbols. In addition to the cyclic prefix, each symbol period may contain one or more (e.g., N f ) sampling period. The duration of a symbol period may depend on the subcarrier spacing or frequency band of operation.

[0064] A subframe, a time slot, a mini-slot, or a 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 a burst of a shortened TTI (sTTI)).

[0065] 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 (core set)) of a physical control channel may be defined by a plurality 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., core sets) 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 of a control channel candidate may refer to a plurality of control channel resources (e.g., control channel elements (CCEs)) associated with coded information of a control information format having a given payload size. A search space set may include a common search space set configured for sending control information to a plurality of UEs 115 and a UE-specific search space set for sending control information to a particular UE 115.

[0066] 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 the base station 105 (e.g., via 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 the logical communication entity operates. Depending on various factors such as the capabilities of the base station 105, these cells may range from smaller areas (e.g., structures, subsets of structures) to larger areas. For example, a unit may be or include a building, a subset of a building, or an external space between or overlapping geographic coverage areas 110, etc.

[0067] A macro cell typically covers a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access by a UE 115 through a service subscription with a network provider that supports the macro cell. A small cell may be associated with a base station with lower power than 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 a UE 115 through a service subscription with a network provider, or may provide restricted access to a UE 115 associated with a small cell (e.g., a UE 115 in a closed subscriber group (CSG), a UE 115 associated with a user in a home or office). A base station 105 may support one or more cells, and may also support communication on one or more cells using one or more component carriers.

[0068] 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.

[0069] In some examples, base stations 105 may be mobile, and thus 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.

[0070] 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, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based business charging.

[0071] Some UEs 115 may be configured to employ a reduced power consumption operating mode, 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 at a reduced peak rate. Other energy-saving techniques for UEs 115 include entering a power-saving deep sleep mode when not participating 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.

[0072] 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. UE115 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 service prioritization, and mission-critical services may be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, mission-critical, and ultra-reliable low-latency may be used interchangeably herein.

[0073] In some examples, UE 115 may also communicate directly with other UE 115 via D2D communication link 135 (e.g., using peer-to-peer (P2P) or D2D protocols). One or more UE 115 utilizing D2D communication may be within the geographic coverage area 110 of base station 105. Other UE 115 in such a group may be outside the geographic coverage area 110 of base station 105 or unable to receive transmissions from base station 105. In some examples, a group of UE 115 communicating via D2D communication may utilize a one-to-many (1:M) system in which each UE 115 transmits to each other UE 115 in the group. In some examples, base station 105 facilitates scheduling of resources for D2D communication. In other cases, D2D communication is performed between UE 115 without involving base station 105.

[0074] In some systems, the D2D communication link 135 can be an example of a communication channel between vehicles (e.g., UE 115), such as a sidelink communication channel. In some examples, vehicles can communicate using V2X communication, V2V communication, or some combination of these communications. 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 a V2X system can communicate with roadside infrastructure (e.g., roadside units) via one or more network nodes (e.g., base station 105) using vehicle-to-network (V2N) communication, or communicate with the network, or communicate with both.

[0075] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connection, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or a 5G core (5GC), which 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), a user plane function (UPF)) for routing packets or interconnections to an external network. The control plane entity may manage non-access stratum (NAS) functions of UE 115 served by a base station 105 associated with the core network 130, such as mobility, authentication, and bearer management. User IP packets may be transmitted through user plane entities, which may provide IP address allocation and other functions. The user plane entity may be connected to a network operator IP service 150. The operator IP service 150 may include access to the Internet, an intranet (multiple), an IP multimedia subsystem (IMS), or a packet-switched streaming media service.

[0076] 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 UE 115 via one or more other access network transport entities 145, which may be referred to as radio heads, smart radio heads, or transmit / receive points (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).

[0077] 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). Typically, the region of 300 MHz to 3 GHz is referred to as the ultra-high frequency (UHF) region or decimeter band, because the wavelength range is approximately 1 decimeter to 1 meter long. UHF waves may be blocked or redirected by buildings and environmental features, but these waves may penetrate 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 with frequencies less than 300 MHz.

[0078] The wireless communication system 100 may also operate in the super high frequency (SHF) region (also known as the centimeter band) using a frequency band from 3 GHz to 30 GHz or in the extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz, also known as the millimeter band). In some examples, the wireless communication system 100 may support millimeter wave (mmW) communications between the UE 115 and the base station 105, and the EHF antennas of each device may be smaller and more closely spaced than the UHF antennas. In some examples, this may facilitate the use of antenna arrays within the device. However, the propagation of EHF transmissions may be subject to greater atmospheric attenuation and a shorter range than SHF or UHF transmissions. The techniques disclosed herein may be employed across transmissions using one or more different frequency regions, and the designated use of frequency bands across these frequency regions may vary by country or regulatory agency.

[0079] The wireless communication system 100 can utilize licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 can adopt license assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band such as the 5 GHz industrial, scientific, and medical (ISM) band. When operating in an unlicensed radio spectrum band, devices such as base stations 105 and UEs 115 can use carrier sensing for collision detection and avoidance. In some examples, operations in unlicensed bands can be based on carrier aggregation configurations and component carriers operating in licensed bands (e.g., LAA). Operations in unlicensed spectrum can include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, etc.

[0080] The electromagnetic spectrum is often subdivided into different categories, bands, channels, etc. based on frequency / wavelength. In 5G NR, two initial operating frequency bands have been identified with the frequency range designations FR1 (410MHz-7.125GHz) and FR2 (24.25GHz-52.6GHz). The frequencies between FR1 and FR2 are often referred to as mid-band. Although a portion of FR1 is greater than 6GHz, FR1 is often (interchangeably) referred to as the "sub-6GHz" band in various documents and articles. A similar naming issue sometimes arises regarding FR2, which is often (interchangeably) referred to as the "millimeter wave" band in documents and articles, although it is different from the extremely high frequency (EHF) band (30GHz-300GHz), which is recognized as a "millimeter wave" band by the International Telecommunication Union (ITU).

[0081] In view of the above, unless otherwise specifically stated, it should be understood that if the term "sub-6 GHz" or the like is used herein, it can broadly refer to frequencies that may be less than 6 GHz, may be within FR1, or may include intermediate frequencies. In addition, unless otherwise specifically stated, it should be understood that if the term "millimeter wave" or the like is used herein, it can broadly refer to frequencies that may include intermediate frequencies, may be within FR2, or may be within the EHF band.

[0082] 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, which may support MIMO operations, or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located on an antenna assembly (e.g., an antenna tower). In some examples, the antennas or antenna arrays associated with the base station 105 may be located in different geographical locations. The base station 105 may have an antenna array with several rows and columns of antenna ports, which the base station 105 may use to support beamforming for communications with the UE 115. Similarly, the UE 115 may have one or more antenna arrays, which may support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support radio frequency beamforming for signals sent via the antenna ports.

[0083] The base station 105 or UE 115 can use MIMO communication to exploit multipath signal propagation and improve spectral efficiency by sending or receiving multiple signals via different spatial layers. This technology may be referred to as spatial multiplexing. For example, multiple signals may be sent by a transmitting device via different antennas or different combinations of antennas. Similarly, multiple signals may be received by a receiving device 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) (where multiple spatial layers are sent to the same receiving device), and multi-user MIMO (MU-MIMO) (where multiple spatial layers are sent to multiple devices).

[0084] 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 direct 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 transmitted via antenna elements of an antenna array so that some signals propagating in a particular direction relative to the antenna array experience constructive interference and other signals experience destructive interference. Adjustments to signals transmitted 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 direction (e.g., relative to the antenna array of the transmitting device or the receiving device, or relative to some other direction).

[0085] The base station 105 or the UE 115 may use beam scanning 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 communications with the UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be sent multiple times by the base station 105 in different directions. For example, the base station 105 may send 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 by a receiving device such as the UE 115) to identify a beam direction for later transmission or reception by the base station 105.

[0086] Some signals, such as data signals associated with a particular receiving device, may be transmitted by base station 105 in a single beam direction (e.g., a direction associated with a receiving device such as UE 115). In some examples, a beam direction associated with transmission 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 of the 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.

[0087] In some examples, transmissions by a device (e.g., by a base station 105 or a UE 115) may be performed using multiple beam directions, and the device may use a combination of digital precoding or radio frequency beamforming to generate a combined beam for transmission (e.g., from a base station 105 to a UE 115). The UE 115 may report feedback indicating precoding weights for one or more beam directions, and the feedback may correspond to the number of configured beams across the system bandwidth or one or more subbands. The base station 105 may send reference signals (e.g., cell-specific reference signals (CRS), channel state information reference signals (CSI-RS)) that may be precoded or not precoded. 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 sent by base station 105 in one or more directions, UE 115 may employ similar techniques for sending signals multiple times in different directions (e.g., for identifying a beam direction for subsequent transmission or reception by UE 115) or for sending signals in a single direction (e.g., for sending data to a receiving device).

[0088] A receiving device (e.g., UE 115) may try multiple reception configurations (e.g., directional listening) when receiving various signals (e.g., 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, by processing received signals according to different antenna subarrays, by receiving according to different reception beamforming weight sets (e.g., different directional listening weight sets) applied to signals received at multiple antenna elements of an antenna array, or by processing received signals according to different reception 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, a receiving device may receive along a single beam direction using a single reception configuration (e.g., when receiving a data signal). The single reception configuration may be aligned in a beam direction determined based on listening according to different reception configuration directions (e.g., a beam direction with the highest signal strength, the highest signal-to-noise ratio (SNR), or otherwise acceptable signal quality determined based on listening according to multiple beam directions).

[0089] The wireless communication system 100 can be a packet-based network operating according to a layered protocol stack. In the user plane, the communication at the bearer or packet data aggregation protocol (PDCP) layer can be IP-based. The radio link control (RLC) layer can perform packet segmentation and reassembly to communicate on a logical channel. The MAC layer can perform priority processing and multiplex logical channels into transport channels. The MAC layer can also use error detection technology, error correction technology, or both to support retransmission of the MAC layer to improve link efficiency. In the control plane, the RRC protocol layer can provide the establishment, configuration, and maintenance of an RRC connection between a UE 115 and a base station 105 or a core network 130 that supports a radio bearer for user plane data. At the physical layer, a transport channel can be mapped to a physical channel.

[0090] The UE 115 may include a communication manager 101 that may be used to perform a beam training procedure with a group of UEs 115 supported by the base station 105. The communication manager 101 may send a beam training report to the base station based on the results of the beam training procedure. The beam training report may indicate the received signal quality of the beam training signal, the receive beams and transmit beams used by the group of UEs 115, the time and frequency resources for transmitting and receiving the beam training signal, and the UEs 115 with reachable receive beams.

[0091] UE 115 and groups of UE 115 may be members of a sidelink multicast communication group, where members of the group may communicate with other members of the group to provide data or other information via a sidelink. Communication manager 101 may send a groupcast sidelink request to base station 105. The groupcast sidelink request may include an identifier (ID) of UE 115, a transmit beam of UE 115, a receive beam of receiving UE 115, or an amount of data to be sent by UE 115. Base station 105 may include communication manager 102. After receiving the sidelink request, communication manager 102 of base station 105 may send a sidelink grant (e.g., a transmit or receive grant) in a DCI to UE 115 in the sidelink multicast communication group. The sidelink grant may include information for each hop, such as which UE 115 is to transmit or receive, the receive or transmit beam of UE 115, time and frequency resources, or data to be forwarded or relayed. In some examples, UE 115 may relay information to other UEs 115 in the sidelink multicast communication group.

[0092] In some examples, the communication manager 102 of the base station 105 can receive a sidelink scheduling request for a groupcast communication from a UE 115 in the group of UEs 115 supported by the base station 105. The base station 105 can determine time and frequency resources for sending a multicast sidelink message from the UE 115 to a relay UE 115 of the group of UEs 115. The communication manager 102 of the base station 105 can send a multicast sidelink grant to the group of UEs 115 indicating the time and frequency resources.

[0093] Figure 2 An example of a wireless communication system 200 that supports scheduling based on sidelink multicast reachability according to one or more aspects of the present disclosure is shown. In some examples, the wireless communication system 200 can implement aspects of the wireless communication system 100. In some examples, the wireless communication system 200 can include UE 115-a, UE 115-b, UE 115-c, UE 115-d, UE 115-e, and base station 105-a, which can be referenced Figure 1 An example of UEs 115 and base stations 105 is described. One or more of the UEs 115 may communicate with the base station 105-a using a corresponding access link 205. In this example, the base station 105-a may communicate with the UE 115-a via access link 205-a, may communicate with the UE 115-b via access link 205-b, may communicate with the UE 115-c via access link 205-c, may communicate with the UE 115-d via access link 205-d, and may communicate with the UE 115-e via access link 205-e.

[0094] In this example, UE 115-a, UE 115-b, UE 115-c, UE 115-d, and UE 115-e can be members of a sidelink multicast communication group, where members of the group can communicate with other members of the group to provide data or other information via a sidelink. In some cases, the application layer at the first UE 115-a can prompt the creation of a sidelink multicast communication group, and the group can be established by communicating with the application layers of other UEs 115 in the group. Note that the sidelink multicast communication group shown provides communication between five UEs 115, and for simplicity, five UEs 115 are shown in the wireless communication system 200, and the techniques described herein are applicable to other numbers of UEs 115 within the system in which a multicast communication group can be established. In addition, the sidelink communication technology can be used for device-to-device communication of wireless devices other than UEs, such as base station communication (e.g., wireless backhaul links between base stations or transmit-receive points (TRPs)), communication between access points, etc.

[0095] In some cases, a group of UEs 115 may form a sidelink multicast communication group, and negotiation may occur between the UE 115 members of the group. UE 115-a (or UE 115-b, UE 115-c, UE 115-d, UE 115-e) may send a beam training report 225 to base station 105-a. Base station 105-a may determine a transmit beam 220 for UE 115-a based on beam training report 225 for transmitting a multicast sidelink message to UE 115-b and UE 115-d. In addition, base station 105-a may determine transmit beams 230 and 235 for UE 115-b and UE 115-d for transmitting a multicast sidelink message to UE 115-c and UE 115-e. The base station 105-a may determine receive beams for UE 115-b, UE 115-c, UE 115-d, and UE 115-e based on the beam training report 225 for receiving the multicast sidelink message.

[0096] In some examples, base station 105-a may generate a connection map for UE 115 based on beam training reports 225, the connection map indicating link quality (e.g., interference) between UEs 115 in a sidelink multicast communication group or transmit and receive beams between UEs 115. Base station 105-a may determine time and frequency resources that UE 115 may use based on the connection map.

[0097] The beam training report 225 may identify UEs 115 with reachable receive beams. For example, UE 115-a may be able to directly reach the receive beams of UE 115-b and UE 115-d using transmit beam 220, but may not be able to directly reach the receive beams of UE 115-c and UE 115-e (e.g., UE 115-c and UE 115-e move out of the direct range of the transmit beam of UE 115-a). UE 115-a may perform multi-hop communications with UE 115-c and UE 115-e in a sidelink multicast communication group, such as UE 115-b and UE 115-d relaying communication information to UE 115-c and UE 115-e. For example, in a first hop, UE 115-a may transmit data (e.g., a multicast sidelink message) to UE 115-b and UE 115-d on transmit beam 220 (e.g., a wide beam). In a second hop, UE 115-b may relay the multicast sidelink message to UE 115-c via a sidelink using transmit beam 235 (e.g., a narrow beam), and UE 115-d may relay the multicast sidelink message to UE 115-e via a sidelink using transmit beam 230 (e.g., a narrow beam). If two sidelink communications, such as a sidelink between UE 115-b and UE 115-c and a sidelink between UE 115-d and UE 115-e, do not interfere with each other, the sidelink communications may be scheduled in the same resources (e.g., in the same frequency time slot). However, if the sidelink communications do interfere with each other, the base station 105-a may schedule the sidelink communications in different resources. The UE 115 may provide interference information to the base station 105 - a in a beam training report 225 .

[0098] The group leader (e.g., UE 115-a) may send a sidelink scheduling request 210 to the base station 105-a associated with the operation of the sidelink multicast communication of the group. For example, the UE 115-a may send a scheduling request, a beam training request, a group configuration request, etc. to the base station 105-a. The UE 115-a may send the sidelink scheduling request 210 in an RRC message, a MAC-CE, a scheduling request (SR), a buffer status report (BSR), or any combination thereof. The BSR may indicate the amount of data remaining in the buffer of the UE 115-a for transmission via the multicast sidelink communication.

[0099] In response to the sidelink scheduling request 210, the base station 105-a may send a sidelink grant 215 to the UEs 115 of the group. The sidelink grant 215 may provide information related to the sidelink multicast communication, such as an authorization of time and frequency resources for sidelink transmission, an authorization of resources for beam training, an indication of beams or resources for one or more hops, an ID of the UE 115 for relaying information, or any combination thereof. The UE 115 may receive the multicast sidelink grant 215 via RRC signaling, MAC-CE, DCI transmission, or any combination thereof. In some examples, the sidelink grant 215 may indicate the relay IDs of UE 115-b and UE 115-d to relay the multicast sidelink message from UE 115-a to UE 115-c and UE 115-e in a second hop.

[0100] Figure 3 An example of a wireless communication system 300 that supports scheduling based on sidelink multicast reachability according to one or more aspects of the present disclosure is shown. In some examples, the wireless communication system 300 can implement aspects of the wireless communication system 100 or 200.

[0101] In some examples, the wireless communication system 300 may include UE 115-f, UE 115-g, UE 115-h, UE 115-i, and base station 105-b, which may be referenced Figure 1 An example of UEs 115 and base stations 105 is described. One or more of the UEs 115 may communicate with the base station 105-b using a corresponding access link 305. In this example, the base station 105-b may communicate with the UE 115-f via access link 305-a, may communicate with the UE 115-g via access link 305-b, may communicate with the UE 115-h via access link 205-c, and may communicate with the UE 115-i via access link 205-b. In this example, the UEs 115-f, UEs 115-g, UEs 115-h, and UEs 115-i may be members of a sidelink multicast communication group, wherein members of the group may communicate with other members of the group to provide data or other information via a sidelink.

[0102] As described herein, UE 115 may perform a beam training process and send the results in a beam training report to base station 105-b. Base station 105-b may generate a connection map for UE 115 based on the beam training report, which indicates interference between the transmit beam and the receive beam of UE 115 in the sidelink multicast communication group. UE 115-f may send a sidelink request 315-a associated with the operation of the sidelink multicast communication of the group to base station 105-b. The multicast sidelink request 315-a may include a UE 115-f ID, an ID associated with the sidelink multicast communication group, a transmit beam 325 of UE 115-f, a receive beam 335 of UE 115-h (receiving UE), and an amount of data that UE 115-f may send to UE 115-h (e.g., corresponding to a multicast sidelink message). Additionally or alternatively, UE 115-g may send a sidelink request 315-b to base station 105-a. The multicast sidelink request 315-b may include the UE 115-g ID, the ID associated with the sidelink multicast communication group, the transmit beam 330 of UE 115-g, the receive beam 340 of UE 115-i (the receiving UE), and the amount of data that UE 115-g may send to UE 115-i.

[0103] In response to the sidelink requests 315-a and 315-b, the base station 105-b may determine time and frequency resources for the UE 115 to communicate via the sidelink transmission based on the beam training report from the UE 115. The base station 105-a may send a sidelink grant 320 to the UEs 115 of the group. The sidelink grant 320 may provide information related to the sidelink multicast communication, such as a resource grant for the sidelink transmission, a resource grant for beam training, an indication of the transmit beams 325 and 330 and the receive beams 335 and 340, resources for one or more hops, or any combination thereof. The sidelink grant 320 may be sent via RRC signaling, MAC-CE, DCI transmission, or any combination thereof. In some examples, after determining the connection map, the base station 105-b may schedule transmissions via the sidelinks 310-a and 310-b in the same resources. The base station 105-b may determine based on the connection map that the transmissions may not cause interference with each other. UE 115-f may use transmit beam 325 to send a multicast sidelink message via sidelink 310-a to receive beam 335 of UE 115-h. UE 115-g may use transmit beam 330 to send a multicast sidelink message via sidelink 310-b to receive beam 340 of UE 115-i.

[0104] Figure 4An example of a process flow 400 is shown for supporting scheduling based on sidelink multicast reachability in accordance with one or more aspects of the present disclosure. In some examples, the process flow 400 can implement aspects of wireless communication systems 100, 200, or 300.

[0105] At 405, UE 115-k may send a beam training report to base station 105-c based on a beam training process between two or more UEs (e.g., UE 115-k, UE 115-j, and UE 115-l) in a UE group supported by base station 105-c. Additionally or alternatively, UE 115-j and UE 115-l may send a beam training report to base station 105-c. The beam training report may indicate one or more of resources on which training signals are sent, identities of one or more training beams, received signal quality of training signals received at UE 115-k (e.g., a relay UE), beams used to receive training signals at UE 115-k, resources on which training signals are received, a subset of UEs reachable by UE 115-k that includes UE 115-l, or any combination thereof.

[0106] Base station 105-c may determine, based on the beam training report, a first transmit beam for UE 115-j for transmitting a multicast side link message to UE 115-k, and a second transmit beam for UE 115-k for transmitting a multicast side link message to UE 115-l. In some examples, base station 105-c may determine, based on the beam training report, a first receive beam for UE 115-k for receiving a multicast side link message from UE 115-j, and a second receive beam for UE 115-l for receiving a multicast side link message from UE 115-k. The first transmit and receive beams may be specific to a first hop of a multi-hop transmission of the multicast side link message, and the second transmit and receive beams may be specific to a second hop of the multi-hop transmission of the multicast side link message.

[0107] At 410, the base station 105-c may generate a connection map associated with the UE group based on the beam training report, the connection map indicating link quality between two or more UEs of the UE group. The connection map may indicate transmit beam and receive beam link quality between the two or more UEs.

[0108] At 415, the base station 105-c may receive a sidelink scheduling request for multicast communication between the UE 115-j and the UE group from a UE 115-j in the UE group supported by the base station 105-c. The sidelink scheduling request may include a group identifier associated with the UE group, an identifier of the UE 115-j, one or more transmit beams for the multicast sidelink message, a respective identifier of each UE in the UE group, an amount of data corresponding to the multicast sidelink message, or any combination thereof.

[0109] At 420, the base station 105-c may determine, based on a beam training report or a connection map associated with a beam training process between the first UE and one or more other UEs in the UE group, a first time resource for transmitting a multicast sidelink message from the UE 115-j to the UE 115-k (e.g., a relay UE) of the UE group and a second time resource for transmitting the multicast sidelink message from the relay UE 115-k to the UE 115-l of the UE group, wherein the UE group includes one or more UEs. The first time resource may be associated with a first hop of a multi-hop transmission of the multicast sidelink message, and the second time resource may be associated with a second hop of the multi-hop transmission of the multicast sidelink message.

[0110] At 425, the base station 105-c may send a multicast side link grant indicating the first and second time resources to UE 115-j, UE 115-k, and UE 115-l. UE 115-k may determine a receive beam for receiving a multicast side link message from UE 115-j and a transmit beam for transmitting a multicast side link message from UE 115-j based on the multicast side link grant, monitor the first time resource for the multicast side link message using the receive beam, and transmit the multicast side link message via the second time resource using the transmit beam. UE 115-j, UE 115-k, and UE 115-l may receive the multicast side link grant via RRC signaling, MAC-CE, DCI transmission, or any combination thereof. The sidelink grant may indicate a relay identifier of relay UE 115-k, corresponding receive identifiers of one or more receiving UEs including UE 115-l, a hop count or identifier for transmission of a multicast sidelink message by relay UE 115-k, a transmit beam for transmission of a multicast sidelink message by UE 115-j or relay UE 115-k, or any combination thereof.

[0111] At 430, UE 115-k may receive a multicast sidelink message from UE 115-j via the first time resource.

[0112] At 435, UE 115-k may send the multicast sidelink message received from UE 115-j to UE 115-1 via the second time resource.

[0113] Figure 5 A block diagram 500 of a device 505 supporting scheduling based on sidelink multicast reachability according to one or more aspects of the present disclosure is shown. The device 505 can be an example of aspects of the UE 115 as described herein. The device 505 can include a receiver 510, a communication manager 515, and a transmitter 520. The device 505 can also include a processor. Each of these components can communicate with each other (e.g., via one or more buses).

[0114] The receiver 510 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to scheduling based on sidelink multicast reachability). The information may be passed to other components of the device 505. The receiver 510 may be a reference Figure 8 Examples of aspects of transceiver 820 are described. Receiver 510 may utilize a single antenna or a collection of antennas.

[0115] The communication manager 515 may send a beam training report to the base station based on a beam training process between two or more UEs in a UE group supported by the base station, receive a multicast side link grant from the base station based on the beam training report, the multicast side link grant indicating a first time resource for transmitting a multicast side link message from a first UE to a second UE and a second time resource for transmitting a multicast side link message from the second UE to a third UE, receive a multicast side link message from the first UE via the first time resource, and send the multicast side link message received from the first UE to the third UE via the second time resource. The communication manager 515 may be an example of aspects of the communication manager 810 described herein.

[0116] The communication manager 515 or its subcomponents may be implemented by hardware, code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 515 or its subcomponents may be performed by a general purpose 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.

[0117] The communication manager 515 or its subcomponents can be physically located in a variety of locations, including being distributed so that portions of the functionality are implemented by one or more physical components at different physical locations. In some examples, the communication manager 515 or its subcomponents can be independent and distinct components according to various aspects of the present disclosure. In some examples, the communication manager 515 or its subcomponents can be combined with one or more other hardware components, including but not limited to input / output (I / O) components, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof according to various aspects of the present disclosure.

[0118] The communication manager 515 may be an example of a component for performing various aspects of the sidelink multicast reachability as described herein. The communication manager 515 or its subcomponents may be implemented in hardware (e.g., in a communication management circuit). The circuit may include a processor, a DSP, an ASIC, 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 in the present disclosure.

[0119] In another embodiment, the communication manager 515 or its subcomponents may be implemented in code executed by a processor (e.g., as communication management software or firmware) or any combination thereof. If implemented in code executed by a processor, the functionality of the communication manager 515 or its subcomponents may be implemented by a general purpose processor, DSP, ASIC, FPGA, or other programmable logic device.

[0120] In some examples, communication manager 515 may be configured to perform various operations (e.g., receive, determine, execute, send) using or otherwise cooperating with receiver 510, transmitter 520, or both.

[0121] Transmitter 520 can transmit signals generated by other components of device 505. In some examples, transmitter 520 can be collocated with receiver 510 in a transceiver module. For example, transmitter 520 can be a reference Figure 8 Examples of aspects of the transceiver 820 are described. The transmitter 520 may utilize a single antenna or a collection of antennas.

[0122] In some examples, the communication manager 515 can be implemented as an integrated circuit or chipset for a mobile device modem, and the receiver 510 and transmitter 520 can be implemented as analog components (e.g., amplifiers, filters, antennas) coupled to the mobile device modem to enable wireless transmission and reception on one or more frequency bands.

[0123] The communication manager 515 as described herein may be implemented to achieve one or more potential advantages. One embodiment may allow the device 505 to receive a multicast side link grant. The multicast side link grant may indicate time resources for transmitting the multicast side link message. The indication of time resources may increase reliability and reduce latency during side link communications.

[0124] Based on the techniques for implementing sidelink multicast reachability-based scheduling as described herein, the processor of UE 115 (e.g., as described in reference Figure 8As described above, controlling the receiver 510, transmitter 520, or transceiver 820) can increase reliability and reduce signaling overhead in multicast sidelink message communications because the UE 115 can avoid undergoing unnecessary configuration procedures during transmission.

[0125] Figure 6 A block diagram 600 of a device 605 supporting scheduling based on sidelink multicast reachability according to one or more aspects of the present disclosure is shown. The device 605 can be an example of aspects of the device 505 or UE 115 as described herein. The device 605 may include a receiver 610, a communication manager 615, and a transmitter 640. The device 605 may also include a processor. Each of these components can communicate with each other (e.g., via one or more buses).

[0126] The receiver 610 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to scheduling based on sidelink multicast reachability). The information may be passed to other components of the device 605. The receiver 610 may be a reference Figure 8 Examples of aspects of transceiver 820 are described. Receiver 610 may utilize a single antenna or a collection of antennas.

[0127] The communication manager 615 may be an example of aspects of the communication manager 515 as described herein. The communication manager 615 may include a training report transmitter 620, a grant receiver 625, a sidelink receiver 630, and a sidelink transmitter 635. The communication manager 615 may be an example of aspects of the communication manager 810 described herein.

[0128] The training report transmitter 620 may transmit a beam training report to the base station based on a beam training procedure between two or more UEs in a UE group supported by the base station.

[0129] The grant receiver 625 may receive a multicast side link grant from the base station based on the beam training report, the multicast side link grant indicating a first time resource for transmitting a multicast side link message from the first UE to the second UE and a second time resource for transmitting a multicast side link message from the second UE to the third UE.

[0130] The sidelink receiver 630 may receive a multicast sidelink message from the first UE via the first time resource.

[0131] The sidelink transmitter 635 may transmit the multicast sidelink message received from the first UE to the third UE via the second time resource.

[0132] Transmitter 640 can transmit signals generated by other components of device 605. In some examples, transmitter 640 can be collocated with receiver 610 in a transceiver module. For example, transmitter 640 can be a reference Figure 8 Examples of aspects of the transceiver 820 are described. The transmitter 640 may utilize a single antenna or a collection of antennas.

[0133] In some examples, the communication manager 615 can be implemented as an integrated circuit or chipset for a mobile device modem, and the receiver 610 and transmitter 640 can be implemented as analog components (e.g., amplifiers, filters, antennas) coupled to the mobile device modem to enable wireless transmission and reception on one or more frequency bands.

[0134] The communication manager 615 as described herein may be implemented to achieve one or more potential advantages. One embodiment may allow the device 605 to receive a multicast side link grant. The multicast side link grant may indicate time resources for transmitting the multicast side link message. The indication of time resources may increase reliability and reduce latency during side link communications.

[0135] Based on the techniques for implementing sidelink multicast reachability-based scheduling as described herein, the processor of UE 115 (e.g., as described in reference Figure 8 As described above, controlling the receiver 610, transmitter 640, or transceiver 820) can increase reliability and reduce signaling overhead in multicast sidelink message communications because the UE 115 can avoid going through unnecessary configuration procedures during transmission.

[0136] Figure 7 A block diagram 700 of a communication manager 705 supporting scheduling based on sidelink multicast reachability according to one or more aspects of the present disclosure is shown. The communication manager 705 can be an example of aspects of the communication manager 515, the communication manager 615, or the communication manager 810 described herein. The communication manager 705 can include a training report transmitter 710, a grant receiver 715, a sidelink receiver 720, a sidelink transmitter 725, a sidelink receive beam module 730, and a sidelink transmit beam module 735. Each of these modules can communicate with each other directly or indirectly (e.g., via one or more buses).

[0137] The training report transmitter 710 may send a beam training report to the base station based on a beam training process between two or more UEs in a UE group supported by the base station. In some cases, the beam training report indicates one or more of the resources for sending the training signal, the identification of one or more training beams, the received signal quality of the training signal received at the second UE, the beam for receiving the training signal at the second UE, the resources for receiving the training signal, or any combination thereof. In some examples, the beam training report indicates a subset of UEs that the second UE can reach, including the third UE.

[0138] The grant receiver 715 may receive a multicast side link grant from the base station based on the beam training report, the multicast side link grant indicating a first time resource for transmitting a multicast side link message from the first UE to the second UE and a second time resource for transmitting a multicast side link message from the second UE to the third UE. In some examples, the grant receiver 715 may receive the multicast side link grant via RRC signaling, MAC-CE, DCI transmission, or any combination thereof. In some cases, the multicast side link grant indicates a relay identifier of the second UE, corresponding reception identifiers of one or more receiving UEs including a third UE, a hop count or identifier for transmitting the multicast side link message by the second UE, a transmit beam for transmitting the multicast side link message by the first UE or the second UE, or any combination thereof.

[0139] The sidelink receiver 720 may receive a multicast sidelink message from the first UE via the first time resource. In some examples, the sidelink receiver 720 may use a receive beam to monitor the first time resource for the multicast sidelink message.

[0140] The sidelink transmitter 725 may transmit the multicast sidelink message received from the first UE to the third UE via the second time resource. In some examples, the sidelink transmitter 725 may transmit the multicast sidelink message via the second time resource using a transmit beam.

[0141] The sidelink receive beam module 730 may determine a receive beam for receiving a multicast sidelink message from the first UE based on the multicast sidelink grant.

[0142] The sidelink transmit beam module 735 may determine a transmit beam for transmitting a multicast sidelink message to a third UE based on the multicast sidelink grant.

[0143] Figure 8A diagram of a system 800 including a device 805 that supports scheduling based on sidelink multicast reachability according to one or more aspects of the present disclosure is shown. The device 805 may be an example of or include components of a device 505, a device 605, or a UE 115 as described herein. The device 805 may include components for two-way voice and data communications, including components for sending and receiving communications, including a communication manager 810, an I / O controller 815, a transceiver 820, an antenna 825, a memory 830, and a processor 840. These components may communicate electronically via one or more buses (e.g., a bus 845).

[0144] The communication manager 810 can send a beam training report to the base station based on a beam training process between two or more UEs in a UE group supported by the base station, receive a multicast side link authorization from the base station based on the beam training report, the multicast side link authorization indicating a first time resource for transmitting a multicast side link message from a first UE to a second UE and a second time resource for transmitting a multicast side link message from the second UE to a third UE, receive a multicast side link message from the first UE via the first time resource, and send the multicast side link message received from the first UE to the third UE via the second time resource.

[0145] I / O controller 815 can manage input and output signals of device 805. I / O controller 815 can also manage peripheral devices that are not integrated into device 805. In some cases, I / O controller 815 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 815 can utilize a computer such as a Or another known operating system. In other cases, I / O controller 815 can be represented or interacted with by a modem, keyboard, mouse, touch screen, or similar device. In some cases, I / O controller 815 can be implemented as part of a processor. In some cases, a user can interact with device 805 via I / O controller 815 or via hardware components controlled by I / O controller 815.

[0146] The transceiver 820 may communicate bidirectionally via one or more antennas, wired or wireless links as described herein. For example, the transceiver 820 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 820 may also include a modem for modulating packets and providing the modulated packets to an antenna for transmission, and demodulating packets received from an antenna.

[0147] In some cases, device 805 may include a single antenna 825, or device 805 may have more than one antenna 825, which may be capable of sending or receiving multiple wireless transmissions simultaneously.

[0148] The memory 830 may include random access memory (RAM) and read-only memory (ROM). The memory 830 may store computer-readable computer executable code 835, which includes instructions that, when executed, cause the processor to perform various functions described herein. In some cases, the memory 830 may contain a basic I / O system (BIOS), etc., which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0149] Processor 840 may include an intelligent hardware device (e.g., a general purpose processor, a DSP, a central processing unit (CPU), a microcontroller, an ASIC, an FPGA, a programmable logic device, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, processor 840 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into processor 840. Processor 840 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 830) to cause device 805 to perform various functions (e.g., functions or tasks that support scheduling based on sidelink multicast reachability).

[0150] The code 835 may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications. The code 835 may be stored in a non-transitory computer-readable medium such as a system memory or other type of memory. In some cases, the code 835 may not be directly executed by the processor 840, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0151] Fig. 9 A block diagram 900 of a device 905 supporting scheduling based on sidelink multicast reachability according to one or more aspects of the present disclosure is shown. The device 905 can be an example of aspects of the base station 105 as described herein. The device 905 can include a receiver 910, a communication manager 915, and a transmitter 920. The device 905 can also include a processor. Each of these components can communicate with each other (e.g., via one or more buses).

[0152] The receiver 910 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to scheduling based on sidelink multicast reachability). The information may be passed to other components of the device 905. The receiver 910 may be a reference Fig.12 Examples of aspects of the transceiver 1220 are described. The receiver 910 may utilize a single antenna or a collection of antennas.

[0153] The communication manager 915 may receive a sidelink scheduling request for multicast communication between the first UE and the UE group from a first UE in the UE group supported by the base station, determine a first time resource for transmitting a multicast sidelink message from the first UE to a second UE in the UE group and a second time resource for transmitting a multicast sidelink message from the second UE to a third UE in the UE group based on a beam training report associated with a beam training process between the first UE and one or more other UEs in the UE group, and send a multicast sidelink grant indicating the first and second time resources. The communication manager 915 may be an example of aspects of the communication manager 1210 described herein.

[0154] The communication manager 915 or its subcomponents may be implemented by hardware, code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 915 or its subcomponents may be performed by a general purpose processor, DSP, ASIC, 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.

[0155] The communication manager 915 or its subcomponents can be physically located in a variety of locations, including being distributed so that portions of the functionality are implemented by one or more physical components at different physical locations. In some examples, the communication manager 915 or its subcomponents can be independent and distinct components according to various aspects of the present disclosure. In some examples, the communication manager 915 or its subcomponents can be combined with one or more other hardware components, including but not limited to I / O components, transceivers, network servers, another computing device, one or more other components described in the present disclosure, or combinations thereof according to various aspects of the present disclosure.

[0156] The communication manager 915 may be an example of a component for performing various aspects of the sidelink multicast reachability as described herein. The communication manager 915 or its subcomponents may be implemented in hardware (e.g., in a communication management circuit). The circuit may include a processor, a DSP, an ASIC, 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 in the present disclosure.

[0157] In another embodiment, the communication manager 915 or its subcomponents may be implemented in code executed by a processor (e.g., as communication management software or firmware) or any combination thereof. If implemented in code executed by a processor, the functionality of the communication manager 915 or its subcomponents may be implemented by a general purpose processor, DSP, ASIC, FPGA, or other programmable logic device.

[0158] In some examples, communications manager 915 may be configured to perform various operations (e.g., receive, determine, execute, send) using or otherwise cooperating with receiver 910, transmitter 920, or both.

[0159] The transmitter 920 can transmit signals generated by other components of the device 905. In some examples, the transmitter 920 can be collocated with the receiver 910 in the transceiver module. For example, the transmitter 920 can be a reference Fig.12 Examples of aspects of the transceiver 1220 are described. The transmitter 920 may utilize a single antenna or a collection of antennas.

[0160] Fig.10 A block diagram 1000 of a device 1005 supporting scheduling based on sidelink multicast reachability according to one or more aspects of the present disclosure is shown. The device 1005 can be an example of aspects of the device 905 or base station 105 as described herein. The device 1005 may include a receiver 1010, a communication manager 1015, and a transmitter 1035. The device 1005 may also include a processor. Each of these components can communicate with each other (e.g., via one or more buses).

[0161] The receiver 1010 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to scheduling based on sidelink multicast reachability). The information may be passed to other components of the device 1005. The receiver 1010 may be a reference Fig.12 Examples of aspects of the transceiver 1220 are described. The receiver 1010 may utilize a single antenna or a collection of antennas.

[0162] The communication manager 1015 may be an example of aspects of the communication manager 915 as described herein. The communication manager 1015 may include a request receiver 1020, a resource component 1025, and a grant sender 1030. The communication manager 1015 may be an example of aspects of the communication manager 1210 described herein.

[0163] The request receiver 1020 may receive, from a first UE in a UE group supported by the base station, a sidelink scheduling request for groupcast communication between the first UE and the UE group.

[0164] Resource component 1025 can determine a first time resource for transmitting a multicast side link message from the first UE to a second UE in the UE group and a second time resource for transmitting a multicast side link message from the second UE to a third UE in the UE group based on a beam training report associated with a beam training process between the first UE and one or more other UEs in the UE group.

[0165] The grant transmitter 1030 may transmit a multicast side link grant indicating a first time resource and a second time resource.

[0166] Transmitter 1035 can transmit signals generated by other components of device 1005. In some examples, transmitter 1035 can be collocated with receiver 1010 in a transceiver module. For example, transmitter 1035 can be a reference Fig.12 Examples of aspects of the transceiver 1220 are described. The transmitter 1035 may utilize a single antenna or a collection of antennas.

[0167] Fig.11 A block diagram 1100 of a communication manager 1105 supporting scheduling based on sidelink multicast reachability according to one or more aspects of the present disclosure is shown. The communication manager 1105 can be an example of aspects of the communication manager 915, the communication manager 1015, or the communication manager 1210 described herein. The communication manager 1105 can include a request receiver 1110, a resource component 1115, a grant sender 1120, a training report manager 1125, a connection map module 1130, a transmit beam manager 1135, and a receive beam manager 1140. Each of these modules can communicate with each other directly or indirectly (e.g., via one or more buses).

[0168] The request receiver 1110 may receive a sidelink scheduling request for multicast communication between the first UE and the UE group from a first UE in the UE group supported by the base station. In some cases, the sidelink scheduling request includes a group identifier associated with the UE group, an identifier of the first UE, one or more transmit beams for the multicast sidelink message, a corresponding identifier of each UE in the UE group, an amount of data corresponding to the multicast sidelink message, or any combination thereof.

[0169] Resource component 1115 may determine a first time resource for transmitting a multicast side link message from the first UE to a second UE in the UE group and a second time resource for transmitting a multicast side link message from the second UE to a third UE in the UE group based on a beam training report associated with a beam training process between the first UE and one or more other UEs in the UE group. In some examples, resource component 1115 may determine the first time resource and the second time resource based on the second beam training report. In some cases, resource component 1115 may determine the first time resource and the second time resource based on a connection graph. In some instances, the first time resource is associated with a first hop of a multi-hop transmission of the multicast side link message. In some aspects, the second time resource is associated with a second hop of a multi-hop transmission of the multicast side link message.

[0170] The grant transmitter 1120 may send a multicast side link grant indicating a first time resource and a second time resource. In some examples, the grant transmitter 1120 may send the multicast side link grant to the first UE, the second UE, at least one other UE, or any combination thereof. In some cases, the multicast side link grant is sent via RRC signaling, MAC-CE, DCI transmission, or any combination thereof.

[0171] The training report manager 1125 may receive a beam training report from the first UE. In some examples, the training report manager 1125 may receive a second beam training report from the second UE, the second beam training report being associated with a second beam training procedure between the second UE and at least one other UE. In some cases, the at least one other UE includes the first UE, the second UE, or another UE.

[0172] The connection map module 1130 can generate a connection map associated with the UE group based on the beam training report, wherein the connection map indicates the link quality between two or more UEs of the UE group. In some cases, the connection map indicates the transmit beam and receive beam link quality between the two or more UEs.

[0173] The transmit beam manager 1135 may determine a first transmit beam for the first UE based on the beam training report for transmitting a multicast sidelink message to the second UE. In some examples, the transmit beam manager 1135 may determine a second transmit beam for the second UE based on the beam training report for transmitting a multicast sidelink message to a third UE.

[0174] The receive beam manager 1140 may determine a first receive beam for a second UE based on the beam training report for receiving a multicast side link message from the first UE. In some examples, the receive beam manager 1140 may determine a second receive beam for a third UE based on the beam training report for receiving a multicast side link message from the second UE. In some cases, the first transmit and receive beam is specific to a first hop of a multi-hop transmission of the multicast side link message. In some aspects, the second transmit and receive beam is specific to a second hop of a multi-hop transmission of the multicast side link message.

[0175] Fig.12A diagram of a system 1200 including a device 1205 supporting scheduling based on sidelink multicast reachability according to one or more aspects of the present disclosure is shown. The device 1205 may be an example of or include components of the device 905, device 1005, or base station 105 as described herein. The device 1205 may include components for two-way voice and data communications, including components for sending and receiving communications, including a communication manager 1210, a network communication manager 1215, a transceiver 1220, an antenna 1225, a memory 1230, a processor 1240, and an inter-station communication manager 1245. These components may be in electronic communication via one or more buses (e.g., bus 1250).

[0176] The communication manager 1210 can receive a sidelink scheduling request for multicast communication between the first UE and the UE group from a first UE in the UE group supported by the base station, determine a first time resource for transmitting a multicast sidelink message from the first UE to a second UE in the UE group and a second time resource for transmitting a multicast sidelink message from the second UE to a third UE in the UE group based on a beam training report associated with a beam training process between the first UE and one or more other UEs in the UE group, and send a multicast sidelink grant indicating the first and second time resources.

[0177] The network communications manager 1215 may manage communications with the core network (eg, via one or more wired backhaul links). For example, the network communications manager 1215 may manage the delivery of data communications for client devices such as one or more UEs 115 .

[0178] The transceiver 1220 may communicate bidirectionally via one or more antennas, wired or wireless links as described herein. For example, the transceiver 1220 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 1220 may also include a modem for modulating packets and providing the modulated packets to an antenna for transmission, and demodulating packets received from an antenna.

[0179] In some cases, a wireless device may include a single antenna 1225. However, in some cases, a device may have more than one antenna 1225, which may be capable of transmitting or receiving multiple wireless transmissions simultaneously.

[0180] The memory 1230 may include RAM, ROM, or a combination thereof. The memory 1230 may store computer readable code 1235, which includes instructions that, when executed by a processor (e.g., processor 1240), cause the device to perform various functions described herein. In some cases, the memory 1230 may include a BIOS, etc., which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0181] Processor 1240 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, processor 1240 may be configured to operate a memory array using a memory controller. In some cases, the memory controller may be integrated into processor 1240. Processor 1240 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1230) to cause device 1205 to perform various functions (e.g., functions or tasks that support scheduling based on sidelink multicast reachability).

[0182] The inter-site communication manager 1245 may manage communications with other base stations 105 and may include a controller or scheduler for controlling communications with UE 115 in collaboration with other base stations 105. For example, the inter-site communication manager 1245 may coordinate scheduling of transmissions to UE 115 for various interference mitigation techniques such as beamforming or joint transmission. In some examples, the inter-site communication manager 1245 may provide an X2 interface within an LTE / LTE-A wireless communication network technology to provide communications between base stations 105.

[0183] The code 1235 may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications. The code 1235 may be stored in a non-transitory computer-readable medium such as a system memory or other type of memory. In some cases, the code 1235 may not be directly executed by the processor 1240, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0184] Fig.13 A flow chart illustrating a method 1300 for supporting scheduling based on sidelink multicast reachability according to one or more aspects of the present disclosure is shown. The operations of the method 1300 may be implemented by the base station 105 or a component thereof, as described herein. For example, the operations of the method 1300 may be performed by a communication manager, as described in reference to Figures 9 to 12In some examples, the base station may execute a set of instructions to control functional elements of the base station to perform the functions described herein. Additionally or alternatively, the base station may use dedicated hardware to perform aspects of the functions described herein.

[0185] At 1305, the base station may receive a sidelink scheduling request for multicast communication between the first UE and the UE group from a first UE in the UE group supported by the base station. The operation of 1305 may be performed according to the methods described herein. In some examples, aspects of the operation of 1305 may be as described in reference to Figures 9 to 12 The request receiver is executed.

[0186] At 1310, the base station may determine, based on a beam training report associated with a beam training process between the first UE and one or more other UEs in the UE group, a first time resource for transmitting a multicast sidelink message from the first UE to a second UE in the UE group and a second time resource for transmitting a multicast sidelink message from the second UE to a third UE in the UE group. The operations of 1310 may be performed according to the methods described herein. In some examples, aspects of the operations of 1310 may be described with reference to Figures 9 to 12 The resource component is executed.

[0187] At 1315, the base station may send a multicast side link grant indicating the first time resource and the second time resource. The operations of 1315 may be performed according to the methods described herein. In some examples, aspects of the operations of 1315 may be as described in reference to Figures 9 to 12 The authorized sender is executed.

[0188] Fig.14 A flow chart illustrating a method 1400 for supporting scheduling based on sidelink multicast reachability according to one or more aspects of the present disclosure is shown. The operations of the method 1400 may be implemented by the base station 105 or a component thereof, as described herein. For example, the operations of the method 1400 may be performed by a communication manager, as described in reference to Figures 9 to 12 In some examples, the base station may execute a set of instructions to control functional elements of the base station to perform the functions described herein. Additionally or alternatively, the base station may use dedicated hardware to perform aspects of the functions described herein.

[0189] At 1405, the base station may receive a beam training report from the first UE. The operations of 1405 may be performed according to the methods described herein. In some examples, aspects of the operations of 1405 may be as described in reference to Figures 9 to 12 The training report manager is used to execute.

[0190] At 1410, the base station may receive a second beam training report from the second UE, the second beam training report being associated with a second beam training process between the second UE and at least one other UE. The operations of 1410 may be performed according to the methods described herein. In some examples, aspects of the operations of 1410 may be as described in reference to Figures 9 to 12 The training report manager is used to execute.

[0191] At 1415, the base station may receive a sidelink scheduling request for multicast communication between the first UE and the UE group from a first UE in the UE group supported by the base station. The operation of 1415 may be performed according to the methods described herein. In some examples, aspects of the operation of 1415 may be as described in reference to Figures 9 to 12 The request receiver is executed.

[0192] At 1420, the base station may determine, based on a beam training report and a second beam training report associated with a beam training process between the first UE and one or more other UEs in the UE group, a first time resource for transmitting a multicast sidelink message from the first UE to a second UE in the UE group and a second time resource for transmitting a multicast sidelink message from the second UE to a third UE in the UE group. The operations of 1420 may be performed according to the methods described herein. In some examples, aspects of the operations of 1420 may be described with reference to Figures 9 to 12 The resource component is executed.

[0193] At 1425, the base station may send a multicast side link grant indicating the first time resource and the second time resource. The operations of 1425 may be performed according to the methods described herein. In some examples, aspects of the operations of 1425 may be as described in reference to Figures 9 to 12 The authorized sender is executed.

[0194] Fig.15 A flow chart illustrating a method 1500 for supporting scheduling based on sidelink multicast reachability according to one or more aspects of the present disclosure is shown. The operations of the method 1500 may be implemented by the base station 105 or a component thereof, as described herein. For example, the operations of the method 1500 may be performed by a communication manager, as described in reference to Figures 9 to 12 In some examples, the base station may execute a set of instructions to control functional elements of the base station to perform the functions described herein. Additionally or alternatively, the base station may use dedicated hardware to perform aspects of the functions described herein.

[0195] At 1505, the base station may receive a sidelink scheduling request for multicast communication between the first UE and the UE group from a first UE in the UE group supported by the base station. The operation of 1505 may be performed according to the methods described herein. In some examples, aspects of the operation of 1505 may be as described in reference to Figures 9 to 12 The request receiver is executed.

[0196] At 1510, the base station may generate a connection map associated with the UE group based on the beam training report, wherein the connection map indicates link quality between two or more UEs of the UE group. 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 Figures 9 to 12 The connection diagram module is used to execute.

[0197] At 1515, the base station may determine, based on a connection map and a beam training report associated with a beam training process between the first UE and one or more other UEs in the UE group, a first time resource for transmitting a multicast sidelink message from the first UE to a second UE in the UE group and a second time resource for transmitting a multicast sidelink message from the second UE to a third UE in the UE group. 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 Figures 9 to 12 The resource component is executed.

[0198] At 1520, the base station may send a multicast side link grant indicating the first time resource and the second time resource. The operations of 1520 may be performed according to the methods described herein. In some examples, aspects of the operations of 1520 may be as described in reference to Figures 9 to 12 The authorized sender is executed.

[0199] Fig.16 A flow chart illustrating a method 1600 for supporting scheduling based on sidelink multicast reachability according to one or more aspects of the present disclosure is shown. The operations of the method 1600 may be implemented by the UE 115 or a component thereof, as described herein. For example, the operations of the method 1600 may be performed by a communication manager, as described in reference to Figures 5 to 8 In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the functions described herein.

[0200] At 1605, the UE may send a beam training report to the base station based on a beam training process between two or more UEs in a UE group supported by the base station. The operations of 1605 may be performed according to the methods described herein. In some examples, aspects of the operations of 1605 may be as described in reference to Figures 5 to 8 The training report sender is used to perform the training.

[0201] At 1610, the UE may receive a multicast side link grant from a base station based on the beam training report, the multicast side link grant indicating a first time resource for transmitting a multicast side link message from the first UE to the second UE and a second time resource for transmitting a multicast side link message from the second UE to the third UE. The operations of 1610 may be performed according to the methods described herein. In some examples, aspects of the operations of 1610 may be performed as described in reference to Figures 5 to 8 The authorization receiver is used to execute.

[0202] At 1615, the UE may receive a multicast sidelink message from the first UE via the first time resource. The operations of 1615 may be performed according to the methods described herein. In some examples, aspects of the operations of 1615 may be as described in reference to Figures 5 to 8 The side link receiver is performed.

[0203] At 1620, the UE may send a multicast sidelink message received from the first UE to a third UE via the second time resource. The operations of 1620 may be performed according to the methods described herein. In some examples, aspects of the operations of 1620 may be as described in reference to Figures 5 to 8 The side link transmitter is used to perform the above operation.

[0204] Fig.17 A flow chart illustrating a method 1700 for supporting scheduling based on sidelink multicast reachability according to one or more aspects of the present disclosure is shown. The operations of the method 1700 may be implemented by the UE 115 or a component thereof, as described herein. For example, the operations of the method 1700 may be performed by a communication manager, as described in reference to Figures 5 to 8 In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the functions described herein.

[0205] At 1705, the UE may send a beam training report to the base station based on a beam training process between two or more UEs in a UE group supported by the base station. The operations of 1705 may be performed according to the methods described herein. In some examples, aspects of the operations of 1705 may be as described in reference to Figures 5 to 8 The training report sender is used to perform the training.

[0206] At 1710, the UE may receive a multicast side link grant from a base station based on the beam training report, the multicast side link grant indicating a first time resource for transmitting a multicast side link message from a first UE to a second UE and a second time resource for transmitting a multicast side link message from the second UE to a third UE. The operations of 1710 may be performed according to the methods described herein. In some examples, aspects of the operations of 1710 may be performed as described in reference to Figures 5 to 8The authorization receiver is executed.

[0207] At 1715, the UE may determine a receive beam for receiving a multicast side link message from the first UE based on the multicast side link grant. 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 Figures 5 to 8 The side link receive beam module is used to perform the operation.

[0208] At 1720, the UE may use a receive beam to monitor a first time resource for a multicast sidelink message. The operations of 1720 may be performed according to the methods described herein. In some examples, aspects of the operations of 1720 may be as described in reference to Figures 5 to 8 The side link receiver is performed.

[0209] At 1725, the UE may receive a multicast sidelink message from the first UE via the first time resource. The operations of 1725 may be performed according to the methods described herein. In some examples, aspects of the operations of 1725 may be as described in reference to Figures 5 to 8 The side link receiver is performed.

[0210] At 1730, the UE may determine a transmit beam for transmitting a multicast side link message to a third UE based on the multicast side link grant. The operations of 1730 may be performed according to the methods described herein. In some examples, aspects of the operations of 1730 may be as described in reference to Figures 5 to 8 The side link transmit beam module is used to perform the operation.

[0211] At 1735, the UE may transmit the multicast sidelink message received from the first UE to the third UE via the second time resource using the transmit beam. The operation of 1735 may be performed according to the methods described herein. In some examples, aspects of the operation of 1735 may be as described in reference to Figures 5 to 8 The side link transmitter is used to perform the above operation.

[0212] Aspect 1: A method for performing wireless communications at a base station, comprising: receiving a sidelink scheduling request for multicast communication between the first UE and the UE group from a first UE in a UE group supported by the base station, determining a first time resource for transmitting a multicast sidelink message from the first UE to a second UE in the UE group and a second time resource for transmitting a multicast sidelink message from the second UE to a third UE in the UE group based at least in part on a beam training report associated with a beam training process between the first UE and one or more other UEs in the UE group, and sending a multicast sidelink grant indicating the first and second time resources.

[0213] Aspect 2: The method according to Aspect 1 also includes: receiving a beam training report from a first UE; receiving a second beam training report from a second UE, the second beam training report being associated with a second beam training process between the second UE and at least one other UE; and determining the first and second time resources at least partially based on the second beam training report.

[0214] Aspect 3: The method according to Aspect 2, wherein the at least one other UE includes a first UE, a second UE, or another UE.

[0215] Aspect 4: The method according to any one of Aspects 1 to 3 further includes: generating a connection map associated with a UE group based at least in part on a beam training report, wherein the connection map indicates a link quality between two or more UEs in the UE group; and determining a first and second time resource based at least in part on the connection map.

[0216] Aspect 5: The method according to Aspect 4, wherein the connection map indicates transmit beam and receive beam link qualities between two or more UEs.

[0217] Aspect 6: A method according to any of Aspects 1 to 5, wherein: the first time resource is associated with a first hop of multi-hop transmission of the multicast side link message, and the second time resource is associated with a second hop of multi-hop transmission of the multicast side link message.

[0218] Aspect 7: The method according to any one of Aspects 1 to 6 further includes: determining a first transmitting beam for a first UE based at least in part on a beam training report for transmitting a multicast side link message to a second UE, and determining a second transmitting beam for the second UE based at least in part on a beam training report for transmitting a multicast side link message to a third UE.

[0219] Aspect 8: The method according to Aspect 7 also includes: determining a first receiving beam for a second UE based at least in part on a beam training report for receiving a multicast side link message from the first UE, and determining a second receiving beam for a third UE based at least in part on the beam training report for receiving a multicast side link message from the second UE.

[0220] Aspect 9: A method according to Aspect 8, wherein: the first transmit and receive beam is specific to a first hop of a multi-hop transmission of a multicast side link message, and the second transmit and receive beam is specific to a second hop of a multi-hop transmission of a multicast side link message.

[0221] Aspect 10: The method according to any one of Aspects 1 to 9 further includes: sending a multicast sidelink grant to the first UE, the second UE, at least one other UE, or any combination thereof.

[0222] Aspect 11: The method according to aspect 10, wherein the multicast sidelink grant is sent via RRC signaling, MAC-CE, DCI transmission, or any combination thereof.

[0223] Aspect 12: A method according to any one of Aspects 1 to 11, wherein the sidelink scheduling request includes a group identifier associated with a UE group, an identifier of a first UE, one or more transmit beams for a multicast sidelink message, a corresponding identifier of each UE in the UE group, an amount of data corresponding to the multicast sidelink message, or any combination thereof.

[0224] Aspect 13: A method for performing wireless communication at a second UE, comprising: sending a beam training report to a base station based at least in part on a beam training process between two or more UEs in a UE group supported by the base station, receiving a multicast side link authorization from the base station based at least in part on the beam training report, the multicast side link authorization indicating a first time resource for transmitting a multicast side link message from a first UE to a second UE and a second time resource for transmitting a multicast side link message from the second UE to a third UE, receiving a multicast side link message from the first UE via the first time resource; and sending the multicast side link message received from the first UE to the third UE via the second time resource.

[0225] Aspect 14: The method according to Aspect 13 also includes: determining a receiving beam for receiving a multicast side link message from a first UE based at least in part on a multicast side link grant, and using the receiving beam to monitor a first time resource for the multicast side link message.

[0226] Aspect 15: The method according to any one of Aspects 13 to 14 further includes: determining a transmit beam for transmitting a multicast side link message to a third UE based at least in part on a multicast side link grant, and sending the multicast side link message via a second time resource using the transmit beam.

[0227] Aspect 16: The method according to any one of aspects 13 to 15 further includes: receiving a multicast sidelink grant via RRC signaling, MAC, DCI transmission, or any combination thereof.

[0228] Aspect 17: A method according to any one of Aspects 13 to 16, wherein the multicast side link authorization indicates a relay identifier of the second UE, corresponding receiving identifiers of one or more receiving UEs including a third UE, a hop count or identifier for transmitting the multicast side link message by the second UE, a transmitting beam for transmitting the multicast side link message by the first UE or the second UE, or any combination thereof.

[0229] Aspect 18: A method according to any one of Aspects 13 to 17, wherein the beam training report indicates one or more of the resources for sending the training signal, the identification of one or more training beams, the received signal quality of the training signal received at the second UE, the beam used for receiving the training signal at the second UE, the resources for receiving the training signal, or any combination thereof.

[0230] Aspect 19: The method according to any one of aspects 13 to 18, wherein the beam training report indicates a subset of UEs including the third UE that are reachable by the second UE.

[0231] Aspect 20: An apparatus for wireless communication, comprising at least one component for performing the method of any one of aspects 1 to 12.

[0232] Aspect 21: An apparatus for wireless communication, comprising a processor and a memory coupled to the processor, the processor and the memory being configured to perform the method of any one of aspects 1 to 12.

[0233] Aspect 22: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of any one of aspects 1 to 12.

[0234] Aspect 23: An apparatus for wireless communication, comprising at least one component for performing the method of any one of aspects 13 to 19.

[0235] Aspect 24: An apparatus for wireless communication, comprising a processor and a memory coupled to the processor, the processor and the memory being configured to perform the method of any one of aspects 13 to 19.

[0236] Aspect 25: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of any one of aspects 13 to 19.

[0237] It should be noted that the methods described herein describe possible implementations, and that operations and steps may be rearranged or otherwise modified, and other implementations are possible. Furthermore, aspects from two or more methods may be combined.

[0238] Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for purposes of example, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein are applicable to applications beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques may be applicable 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.

[0239] The information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltage, current, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0240] The various illustrative blocks and components described in conjunction with the disclosure herein may be implemented or executed using 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 an alternative, the processor may be any processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in combination with a DSP core, or any other such configuration.

[0241] 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 or transmitted on a computer-readable medium as one or more instructions or codes. Other examples and implementations are within the scope of this 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, hard wiring, or any combination of these. Features that implement the functions may also be physically located in various locations, including being distributed so that portions of the functions are implemented in different physical locations.

[0242] Computer readable medium includes both non-transitory computer storage medium and communication medium, and computer storage medium and communication medium include any medium that helps to transfer computer program from one place to another place.Non-transitory storage medium can be any available medium that can be accessed by general or special-purpose computer.As an example and not limitation, non-transitory computer readable medium may include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), flash memory, compact disk (CD) ROM or other compact disk storage, disk storage or other magnetic storage device or can be used for carrying or storing required program code mode in the form of instruction or data structure and can be accessed by general or special-purpose computer or general or special-purpose processor Any other non-transitory medium.In addition, any connection is appropriately referred to as computer readable medium.For example, if coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wireless technology (such as infrared, radio and microwave) are used to send software from website, server or other remote source, coaxial cable, fiber optic cable, twisted pair, DSL or wireless technology (such as infrared, radio and microwave) are included in the definition of computer readable medium. Disk and disc, as used herein, includes CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc, where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

[0243] As used herein, including in the claims, "or" as used in a list of items (e.g., a list of items preceded by a phrase such as "at least one" or "one or more"), 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). In addition, as used herein, the phrase "based on" should not be interpreted as a reference to a closed set of conditions. For example, an example step described as "based on condition A" can be based on both condition A and condition B without departing from the scope of this 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."

[0244] In the drawings, similar components or features may have the same reference label. In addition, various components of the same type may be distinguished by following the reference label with a dash and a second label that distinguishes between similar components. If only the first reference label is used in the specification, the specification applies to any one similar component having the same first reference label, regardless of the second reference label or other subsequent reference labels.

[0245] 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 within the scope of the claims. The term "example" as used herein means "used as an example, instance, or illustration," rather than "preferred" or "superior to other examples." For the purpose of providing an understanding of the described technology, the detailed description includes specific details. However, the technologies may be practiced without these specific details. In some cases, in order to avoid obscuring the concepts of the described examples, known structures and devices are shown in block diagram form.

[0246] The description provided herein enables 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 general principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Therefore, the present disclosure is not limited to the examples and designs described herein, but conforms to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a network device, comprising: receiving, from a first user equipment UE in a UE group supported by the network device, a sidelink scheduling request for multicast communication between the first UE and the UE group; determining, based at least in part on a beam training report associated with a beam training procedure between the first UE and one or more other UEs in the UE group, a first time resource for transmitting a multicast sidelink message from the first UE to a second UE in the UE group and a second time resource for transmitting the multicast sidelink message from the second UE to a third UE in the UE group; as well as A multicast sidelink grant is sent indicating the first and second time resources.

2. The method according to claim 1, further comprising: receiving the beam training report from the first UE; receiving a second beam training report from the second UE, the second beam training report being associated with a second beam training procedure between the second UE and at least one other UE; as well as The first and second time resources are determined based at least in part on the second beam training report. 3 . The method of claim 2 , wherein the at least one other UE comprises the first UE, the second UE, or another UE.

4. The method according to claim 1, further comprising: generating a connection map associated with the UE group based at least in part on the beam training report, wherein the connection map indicates link quality between two or more UEs in the UE group; as well as The first and second time resources are determined based at least in part on the connection map.

5. The method of claim 4, wherein the connection map indicates transmit beam and receive beam link qualities between the two or more UEs.

6. The method according to claim 1, wherein: The first time resource is associated with a first hop of a multi-hop transmission of the multicast sidelink message; as well as The second time resource is associated with a second hop of the multi-hop transmission of the multicast sidelink message.

7. The method according to claim 1, further comprising: determining, based at least in part on the beam training report, a first transmit beam for the first UE to use to transmit the multicast sidelink message to the second UE; as well as Based at least in part on the beam training report, determine a second transmit beam for the second UE to use to transmit the multicast sidelink message to the third UE.

8. The method according to claim 7, further comprising: determining, based at least in part on the beam training report, a first receive beam for the second UE to use to receive the multicast sidelink message from the first UE; as well as Based at least in part on the beam training report, a second receive beam is determined for the third UE to use to receive the multicast sidelink message from the second UE.

9. The method according to claim 8, wherein: The first transmit and receive beams are specific to a first hop of a multi-hop transmission of the multicast sidelink message; as well as The second transmit and receive beams are specific to a second hop of the multi-hop transmission of the multicast sidelink message.

10. The method according to claim 1, further comprising: The multicast sidelink grant is sent to the first UE, the second UE, at least one other UE, or any combination thereof.

11. The method of claim 10, wherein the multicast sidelink grant is sent via Radio Resource Control (RRC) signaling, Media Access Control (MAC) Control Element (MAC-CE), Downlink Control Information (DCI) transmission, or any combination thereof.

12. The method of claim 1 , wherein the sidelink scheduling request comprises a group identifier associated with the UE group, an identifier of the first UE, one or more transmit beams for the multicast sidelink message, a corresponding identifier of each UE in the UE group, an amount of data corresponding to the multicast sidelink message, or any combination thereof.

13. The method of claim 1, wherein the sending a multicast sidelink grant indicating the first and second time resources comprises: The multicast side link grant indicating the first time resource and the second time resource is sent to the first UE, the second UE, the third UE, or any combination thereof.

14. A method for wireless communication at a second user equipment UE, comprising: sending a beam training report to a network device based at least in part on a beam training procedure between two or more UEs in a group of UEs supported by the network device; receiving a multicast side link grant from the network device based at least in part on the beam training report, wherein the multicast side link grant indicates a first time resource for transmitting a multicast side link message from a first UE to a second UE and a second time resource for transmitting the multicast side link message from the second UE to a third UE; receiving the multicast sidelink message from the first UE via the first time resource; as well as The multicast sidelink message received from the first UE is sent to the third UE via the second time resource.

15. The method according to claim 14, further comprising: determining a receive beam for receiving the multicast sidelink message from the first UE based at least in part on the multicast sidelink grant; as well as The first time resource for the multicast sidelink message is monitored using the receive beam.

16. The method according to claim 14, further comprising: determining a transmit beam for transmitting the multicast sidelink message to the third UE based at least in part on the multicast sidelink grant; as well as The multicast sidelink message is transmitted via the second time resource using the transmit beam.

17. The method according to claim 14, further comprising: The multicast sidelink grant is received via radio resource control RRC signaling, medium access control MAC control element MAC-CE, downlink control information DCI transmission, or any combination thereof.

18. The method of claim 14, wherein the multicast side link authorization indicates a relay identifier of the second UE, corresponding reception identifiers of one or more receiving UEs including the third UE, a hop count or identifier for transmitting the multicast side link message by the second UE, a transmission beam for transmitting the multicast side link message by the first UE or the second UE, or any combination thereof.

19. The method of claim 14, wherein the beam training report indicates one or more of resources for sending a training signal, identification of one or more training beams, received signal quality of the training signal received at the second UE, a beam used to receive the training signal at the second UE, resources for receiving the training signal, or any combination thereof.

20. The method of claim 14, wherein the beam training report indicates a subset of UEs that can be reached by the second UE, including the third UE.

21. An apparatus for wireless communication at a network device, comprising: means for receiving, from a first user equipment UE in a group of UEs supported by the network device, a sidelink scheduling request for multicast communication between the first UE and the group of UEs; means for determining, based at least in part on a beam training report associated with a beam training procedure between the first UE and one or more other UEs in the UE group, a first time resource for transmitting a multicast sidelink message from the first UE to a second UE in the UE group and a second time resource for transmitting the multicast sidelink message from the second UE to a third UE in the UE group; as well as Means for sending a multicast sidelink grant indicating said first and second time resources.

22. The apparatus according to claim 21, further comprising: means for receiving the beam training report from the first UE; means for receiving a second beam training report from the second UE, the second beam training report being associated with a second beam training procedure between the second UE and at least one other UE; as well as Means for determining the first and second time resources based at least in part on the second beam training report.

23. The apparatus of claim 22, wherein the at least one other UE comprises the first UE, the second UE, or another UE.

24. The apparatus according to claim 21, further comprising: means for generating a connection map associated with the group of UEs based at least in part on the beam training reports, wherein the connection map indicates link quality between two or more UEs in the group of UEs; as well as Means for determining the first and second time resources based at least in part on the connection map.

25. The apparatus of claim 24, wherein the connection map indicates transmit beam and receive beam link qualities between the two or more UEs.

26. The apparatus of claim 21, wherein: The first time resource is associated with a first hop of a multi-hop transmission of the multicast sidelink message; and The second time resource is associated with a second hop of the multi-hop transmission of the multicast sidelink message.

27. The apparatus of claim 21, further comprising: means for determining a first transmit beam for the first UE to use to transmit the multicast sidelink message to the second UE based at least in part on the beam training report; as well as Means for determining a second transmit beam for the second UE to use to transmit the multicast sidelink message to the third UE based at least in part on the beam training report.

28. The apparatus according to claim 27, further comprising: means for determining a first receive beam for the second UE to use to receive the multicast sidelink message from the first UE based at least in part on the beam training report; as well as Means for determining a second receive beam for the third UE to use to receive the multicast sidelink message from the second UE based at least in part on the beam training report.

29. The apparatus of claim 28, wherein: The first transmit and receive beams are specific to a first hop of a multi-hop transmission of the multicast sidelink message; as well as The second transmit and receive beams are specific to a second hop of the multi-hop transmission of the multicast sidelink message.

30. The apparatus of claim 21, further comprising: A component for sending the multicast sidelink grant to the first UE, the second UE, at least one other UE, or any combination thereof.

31. The apparatus of claim 21, wherein: The component for sending the multicast side link grant indicating the first and second time resources sends the multicast side link grant indicating the first time resource and the second time resource to the first UE, the second UE, the third UE or any combination thereof.

32. An apparatus for wireless communication at a second user equipment UE, comprising: means for sending a beam training report to a network device based at least in part on a beam training procedure between two or more UEs in a group of UEs supported by the network device; means for receiving a multicast sidelink grant from the network device based at least in part on the beam training report, wherein the multicast sidelink grant indicates a first time resource for transmitting a multicast sidelink message from a first UE to a second UE and a second time resource for transmitting the multicast sidelink message from the second UE to a third UE; means for receiving the multicast sidelink message from the first UE via the first time resource; as well as means for sending the multicast sidelink message received from the first UE to the third UE via the second time resource.

33. A non-transitory computer readable medium having stored thereon instructions which, when executed by a computer, cause the computer to perform the method according to any one of claims 1 to 13.

34. A non-transitory computer readable medium having stored thereon instructions which, when executed by a computer, cause the computer to perform the method according to any one of claims 14 to 20.

35. An apparatus for wireless communication at a network device, comprising: one or more memories; as well as One or more processors, coupled to the one or more memories, and configured to cause the network device to: receiving, from a first user equipment UE in a UE group supported by the network device, a sidelink scheduling request for multicast communication between the first UE and the UE group; determining, based at least in part on a beam training report associated with a beam training procedure between the first UE and one or more other UEs in the UE group, a first time resource for transmitting a multicast sidelink message from the first UE to a second UE in the UE group and a second time resource for transmitting the multicast sidelink message from the second UE to a third UE in the UE group; as well as A multicast sidelink grant is sent indicating the first and second time resources.

36. The apparatus of claim 35, wherein the one or more processors are further configured to cause the network device to: receiving the beam training report from the first UE; receiving a second beam training report from the second UE, the second beam training report being associated with a second beam training procedure between the second UE and at least one other UE; and The first and second time resources are determined based at least in part on the second beam training report.

37. The apparatus of claim 36, wherein the at least one other UE comprises the first UE, the second UE, or another UE.

38. The apparatus of claim 35, wherein the one or more processors are further configured to cause the network device to: generating a connection map associated with the UE group based at least in part on the beam training report, wherein the connection map indicates link quality between two or more UEs in the UE group; and The first time resource and the second time resource are determined based at least in part on the connection map.

39. The apparatus of claim 38, wherein the connection map indicates transmit beam and receive beam link qualities between the two or more UEs.

40. The apparatus of claim 35, wherein: The first time resource is associated with a first hop of a multi-hop transmission of the multicast sidelink message; and The second time resource is associated with a second hop of the multi-hop transmission of the multicast sidelink message.

41. The apparatus of claim 35, wherein the one or more processors are further configured to cause the network device to: determining, based at least in part on the beam training report, a first transmit beam for the first UE to use to transmit the multicast sidelink message to the second UE; and Based at least in part on the beam training report, determine a second transmit beam for the second UE to use to transmit the multicast sidelink message to the third UE.

42. The apparatus of claim 41 , wherein the one or more processors are further configured to cause the network device to: determining, based at least in part on the beam training report, a first receive beam for the second UE to use to receive the multicast sidelink message from the first UE; and Based at least in part on the beam training report, a second receive beam is determined for the third UE to use to receive the multicast sidelink message from the second UE.

43. The apparatus of claim 42, wherein: The first transmit and receive beams are specific to a first hop of a multi-hop transmission of the multicast sidelink message; as well as The second transmit and receive beams are specific to a second hop of the multi-hop transmission of the multicast sidelink message.

44. The apparatus of claim 35, wherein the one or more processors are further configured to cause the network device to: The multicast sidelink grant is sent to the first UE, the second UE, at least one other UE, or any combination thereof.

45. The apparatus of claim 44, wherein the multicast sidelink grant is sent via Radio Resource Control (RRC) signaling, Media Access Control (MAC) Control Element (MAC-CE), Downlink Control Information (DCI) transmission, or any combination thereof.

46. ​​An apparatus according to claim 35, wherein the sidelink scheduling request includes a group identifier associated with the UE group, an identifier of the first UE, one or more transmit beams for the multicast sidelink message, a corresponding identifier of each UE in the UE group, an amount of data corresponding to the multicast sidelink message, or any combination thereof.

47. An apparatus according to claim 35, wherein the one or more processors are further configured to cause the network device to: send the multicast side link grant indicating the first time resource and the second time resource to the first UE, the second UE, the third UE, or any combination thereof.

48. An apparatus for wireless communication at a second user equipment UE, comprising: one or more memories; as well as One or more processors, coupled to the one or more memories, and configured to cause the second UE to: sending a beam training report to a network device based at least in part on a beam training procedure between two or more UEs in a group of UEs supported by the network device; receiving a multicast side link grant from the network device based at least in part on the beam training report, wherein the multicast side link grant indicates a first time resource for transmitting a multicast side link message from a first UE to a second UE and a second time resource for transmitting the multicast side link message from the second UE to a third UE; receiving the multicast sidelink message from the first UE via the first time resource; as well as The multicast sidelink message received from the first UE is sent to the third UE via the second time resource.

49. The apparatus of claim 48, wherein the one or more processors are further configured to cause the second UE to: determining a receive beam for receiving the multicast sidelink message from the first UE based at least in part on the multicast sidelink grant; and The first time resource for the multicast sidelink message is monitored using the receive beam.

50. The apparatus of claim 48, wherein the one or more processors are further configured to cause the second UE to: determining a transmit beam for transmitting the multicast sidelink message to the third UE based at least in part on the multicast sidelink grant; and The multicast sidelink message is transmitted via the second time resource using the transmit beam.

51. The apparatus of claim 48, wherein the one or more processors are further configured to cause the second UE to: The multicast sidelink grant is received via radio resource control RRC signaling, medium access control MAC control element MAC-CE, downlink control information DCI transmission, or any combination thereof.

52. An apparatus according to claim 48, wherein the multicast side link authorization indicates a relay identifier of the second UE, corresponding reception identifiers of one or more receiving UEs including the third UE, a hop count or identifier used for transmitting the multicast side link message by the second UE, a transmission beam used for transmitting the multicast side link message by the first UE or the second UE, or any combination thereof.

53. An apparatus according to claim 48, wherein the beam training report indicates one or more of resources for sending training signals, identification of one or more training beams, received signal quality of the training signal received at the second UE, the beam used to receive the training signal at the second UE, resources for receiving the training signal, or any combination thereof.

54. The apparatus of claim 48, wherein the beam training report indicates a subset of UEs that can be reached by the second UE, including the third UE.

55. An apparatus for wireless communication at a network device, comprising: one or more memories; as well as One or more processors, coupled to the one or more memories, and configured to cause the network device to: receiving one or more beam training reports, each beam training report being associated with a beam training process between two or more UEs in a user equipment UE group, the UE group comprising at least a first UE, a second UE, and a third UE; receiving, from the first UE, a sidelink scheduling request for multicast communication between the group of UEs; as well as Based at least in part on the sidelink scheduling request and at least in part on the one or more beam training reports, send a multicast sidelink grant indicating a first resource and a second resource, wherein the first resource is allocated for sending a multicast sidelink message from the first UE to the second UE, and the second resource is allocated for sending the multicast sidelink message from the second UE to the third UE.

56. The apparatus of claim 55, wherein: To receive the one or more beam training reports, the one or more processors are configured to cause the network device to: receiving a first beam training report from the first UE, the first beam training report being associated with a first beam training procedure between the first UE and at least one UE in the group of UEs; as well as A second beam training report is received from the second UE, the second beam training report being associated with a second beam training procedure between the second UE and the at least one UE in the UE group.

57. The apparatus of claim 55, wherein: The one or more processors are further configured to cause the network device to: A connection map associated with the UE group is generated at least in part based on the one or more beam training reports, wherein the connection map indicates link quality between the two or more UEs in the UE group, and wherein the sending of the multicast side link authorization is based at least in part on the connection map.

58. The apparatus of claim 57, wherein: The connection map indicates transmit and receive beam link qualities between the two or more UEs in the UE group.

59. The apparatus of claim 55, wherein: The one or more processors are further configured to cause the network device to: determining, for the first UE, a first transmit beam for transmitting the multicast sidelink message to the second UE based at least in part on the one or more beam training reports; as well as Based at least in part on the one or more beam training reports, determine for the second UE a second transmit beam for transmitting the multicast sidelink message to the third UE.

60. The apparatus of claim 55, wherein: The one or more processors are further configured to cause the network device to: determining, for the second UE, a first receive beam for receiving the multicast sidelink message from the first UE based at least in part on the one or more beam training reports; as well as Based at least in part on the one or more beam training reports, determining, for the third UE, a second receive beam for receiving the multicast sidelink message from the second UE.

61. The apparatus of claim 55, wherein: The first resource is associated with a first hop of a multi-hop transmission of the multicast sidelink message; and The second resource is associated with a second hop of the multi-hop transmission of the multicast sidelink message.

62. An apparatus according to claim 55, wherein the multicast side link authorization indicates a first beam and a second beam, the first beam used for receiving or sending the multicast side link message between the first UE and the second UE is indicated in the multicast side link authorization, and the second beam used for receiving or sending the multicast side link message between the second UE and the third UE is indicated in the multicast side link authorization.

63. The apparatus of claim 55, wherein: To send the multicast side link grant, the one or more processors are configured to cause the network device to: The multicast side link grant is sent to the first UE, the second UE, the third UE, at least one other UE, or any combination thereof.

64. The apparatus of claim 55, wherein: The multicast sidelink grant is sent via a radio resource control RRC message, a media access control MAC control element MAC-CE, a downlink control information DCI transmission, or any combination thereof.

65. The apparatus of claim 55, wherein: The sidelink scheduling request includes a group identifier associated with the UE group, an identifier of the first UE, one or more transmit beams for the multicast sidelink message, a corresponding identifier for each UE in the UE group, an amount of data corresponding to the multicast sidelink message, or any combination thereof.

66. An apparatus for wireless communication at a first user equipment UE, comprising: one or more memories; as well as One or more processors, coupled to the one or more memories, and configured to cause the first UE to: sending a beam training report associated with two or more UEs in a UE group to a network device, the UE group including a first UE, a second UE, and a third UE; Sending a sidelink request for multicast communication between the UE group to the network device; receiving, based at least in part on the sidelink request and at least in part on the beam training report, from the network device a multicast sidelink grant indicating a first resource for sending a multicast sidelink message from the first UE to the second UE; as well as The multicast sidelink message is sent to the second UE via the first resource.

67. An apparatus according to claim 66, wherein the beam training report indicates one or more resources in which a training signal is sent, an identification of one or more training beams, a received signal quality of the training signal, a beam used to receive the training signal, a resource in which the training signal is received, or any combination thereof.

68. The apparatus of claim 66, wherein: The beam training report indicates a subset of UEs detected by the second UE including the third UE.

69. The apparatus of claim 66, wherein: The one or more processors are further configured to cause the first UE to: Based at least in part on the multicast side link grant, a transmit beam for transmitting the multicast side link message is determined, wherein the multicast side link message is transmitted to the second UE via the transmit beam.

70. The apparatus of claim 66, wherein: The multicast sidelink grant also indicates a second resource allocated for sending the multicast sidelink message from the second UE to the third UE.

71. The apparatus of claim 66, wherein: The multicast side link authorization indicates a relay identifier of the second UE, a corresponding receiving identifier for one or more receiving UEs including the second UE or the third UE, a hop count or identifier for sending the multicast side link message, a transmitting beam for sending the multicast side link message, or any combination thereof.

72. An apparatus for wireless communication at a second user equipment UE, comprising: one or more memories; as well as One or more processors, coupled to the one or more memories, and configured to cause the second UE to: Sending a beam training report associated with two or more UEs in a UE group to a network device, the UE group including at least a first UE, the second UE, and a third UE; receiving, from the network device, a multicast side link grant indicating first resources allocated for sending a multicast side link message from the first UE to the second UE and second resources allocated for sending the multicast side link message from the second UE to the third UE; receiving the multicast sidelink message from the first UE via the first resource; as well as Based at least in part on receiving the multicast sidelink message from the first UE, the multicast sidelink message is sent to the third UE via the second resource.

73. The apparatus of claim 72, wherein: The beam training report indicates one or more of the resources in which the training signal is sent, the identification of one or more training beams, the received signal quality of the training signal received at the second UE, the beam used to receive the training signal at the second UE, the resources in which the training signal is received, or any combination thereof.

74. The apparatus of claim 72, wherein: The beam training report indicates a subset of UEs including the third UE that can be detected by the second UE.

75. The apparatus of claim 72, wherein: The one or more processors are further configured to cause the second UE to: determining, based at least in part on the multicast side link grant, a receive beam for receiving the multicast side link message from the first UE; as well as The first resource for the multicast sidelink message is monitored via the receive beam.

76. The apparatus of claim 72, wherein: The one or more processors are further configured to cause the second UE to: Based at least in part on the multicast sidelink grant, a transmit beam for transmitting the multicast sidelink message to the third UE is determined, wherein the multicast sidelink message is transmitted to the third UE via the transmit beam.

77. The apparatus of claim 72, wherein: The multicast sidelink grant is received via a radio resource control RRC message, a media access control MAC control element MAC-CE, a downlink control information DCI transmission, or any combination thereof.

78. The apparatus of claim 72, wherein: The multicast side link authorization indicates the relay identifier of the second UE, the corresponding receiving identifiers of one or more receiving UEs including the third UE, the number of hops or identifiers used for sending the multicast side link message by the second UE, the transmission beam used for sending the multicast side link message, or any combination thereof.

79. A method for wireless communication at a network device, comprising: receiving one or more beam training reports, each beam training report being associated with a beam training procedure between two or more UEs in a user equipment (UE) group, the UE group comprising a first UE, a second UE, and a third UE; receiving, from the first UE, a sidelink scheduling request for multicast communication between the group of UEs; as well as Based at least in part on the sidelink scheduling request and at least in part on the one or more beam training reports, send a multicast sidelink grant indicating a first resource and a second resource, wherein the first resource is allocated for sending a multicast sidelink message from the first UE to the second UE, and the second resource is allocated for sending the multicast sidelink message from the second UE to the third UE.

80. The method of claim 79, further comprising: Based at least in part on the one or more beam training reports, a connection map associated with the UE group is generated, wherein the connection map indicates link quality between the two or more UEs in the UE group, and wherein the multicast side link authorization is based at least in part on the connection map.

81. The method of claim 79, wherein receiving the one or more beam training reports comprises: receiving a first beam training report from the first UE, the first beam training report being associated with a first beam training procedure between the first UE and at least one UE in the group of UEs; as well as A second beam training report is received from the second UE, the second beam training report being associated with a second beam training procedure between the second UE and the at least one UE in the UE group.

82. A method for wireless communication at a first user equipment UE, comprising: sending a beam training report associated with two or more UEs in a UE group to a network device, the UE group including a first UE, a second UE, and a third UE; Sending a sidelink request for multicast communication between the UE group to the network device; receiving, based at least in part on the sidelink request and at least in part on the beam training report, from the network device a multicast sidelink grant indicating a first resource for sending a multicast sidelink message from the first UE to the second UE; as well as The multicast sidelink message is sent to the second UE via the first resource.

83. The method of claim 82, further comprising: Based at least in part on the multicast side link grant, a transmit beam for transmitting the multicast side link message is determined, wherein the multicast side link message is transmitted to the second UE via the transmit beam.

84. The method of claim 82, wherein the multicast sidelink grant further indicates a second resource allocated for sending the multicast sidelink message from the second UE to the third UE.

85. A method for wireless communication at a second user equipment UE, comprising: Sending a beam training report associated with two or more UEs in a UE group to a network device, the UE group including at least a first UE, the second UE, and a third UE; receiving, from the network device, a multicast side link grant indicating first resources allocated for sending a multicast side link message from the first UE to the second UE and second resources allocated for sending the multicast side link message from the second UE to the third UE; receiving the multicast sidelink message from the first UE via the first resource; as well as Based at least in part on receiving the multicast sidelink message from the first UE, the multicast sidelink message is sent to the third UE via the second resource.

86. The method of claim 85, further comprising: determining, based at least in part on the multicast side link grant, a receive beam for receiving the multicast side link message from the first UE; as well as The first resource for the multicast sidelink message is monitored via the receive beam.

87. The method of claim 85, further comprising: Based at least in part on the multicast sidelink grant, a transmit beam for transmitting the multicast sidelink message to the third UE is determined, wherein the multicast sidelink message is transmitted to the third UE via the transmit beam.

88. A non-transitory computer-readable medium storing code for wireless communication at a network device, the code comprising instructions executable by one or more processors to cause the network device to: receiving one or more beam training reports, each beam training report being associated with a beam training procedure between two or more UEs in a user equipment (UE) group, the UE group comprising a first UE, a second UE, and a third UE; receiving, from the first UE, a sidelink scheduling request for multicast communication between the group of UEs; as well as Based at least in part on the sidelink scheduling request and at least in part on the one or more beam training reports, send a multicast sidelink grant indicating a first resource and a second resource, wherein the first resource is allocated for sending a multicast sidelink message from the first UE to the second UE, and the second resource is allocated for sending the multicast sidelink message from the second UE to the third UE.

89. The non-transitory computer readable medium of claim 88, wherein the instructions are further executable by the one or more processors to cause the network device to: Based at least in part on the one or more beam training reports, a connection map associated with the UE group is generated, wherein the connection map indicates link quality between the two or more UEs in the UE group, and wherein the multicast side link authorization is based at least in part on the connection map.

90. The non-transitory computer readable medium of claim 88, wherein: To receive the one or more beam training reports, the instructions are executable by the one or more processors to cause the network device to: receiving a first beam training report from the first UE, the first beam training report being associated with a first beam training procedure between the first UE and at least one UE in the group of UEs; as well as A second beam training report is received from the second UE, the second beam training report being associated with a second beam training procedure between the second UE and the at least one UE in the UE group.

91. A non-transitory computer-readable medium storing code for wireless communication at a first user equipment (UE), the code comprising instructions executable by one or more processors to cause the first UE to: sending a beam training report associated with two or more UEs in a UE group to a network device, the UE group including a first UE, a second UE, and a third UE; Sending a sidelink request for multicast communication between the UE group to the network device; receiving, based at least in part on the sidelink request and at least in part on the beam training report, from the network device a multicast sidelink grant indicating a first resource for sending a multicast sidelink message from the first UE to the second UE; as well as The multicast sidelink message is sent to the second UE via the first resource.

92. The non-transitory computer-readable medium of claim 91, wherein the instructions are further executable by the one or more processors to cause the first UE to: Based at least in part on the multicast side link grant, a transmit beam for transmitting the multicast side link message is determined, wherein the multicast side link message is transmitted to the second UE via the transmit beam.

93. The non-transitory computer-readable medium of claim 91, wherein the multicast sidelink grant further indicates a second resource for sending the multicast sidelink message from the second UE to the third UE.

94. A non-transitory computer-readable medium storing code for wireless communication at a second user equipment (UE), the code comprising instructions executable by one or more processors to cause the second UE to: Sending a beam training report associated with two or more UEs in a UE group to a network device, the UE group including at least a first UE, the second UE, and a third UE; receiving, from the network device, a multicast side link grant indicating first resources allocated for sending a multicast side link message from the first UE to the second UE and second resources allocated for sending the multicast side link message from the second UE to the third UE; receiving the multicast sidelink message from the first UE via the first resource; as well as Based at least in part on receiving the multicast sidelink message from the first UE, the multicast sidelink message is sent to the third UE via the second resource.

95. The non-transitory computer-readable medium of claim 94, wherein the instructions are further executable by the one or more processors to cause the second UE to: determining, based at least in part on the multicast sidelink grant, a receive beam for receiving the multicast sidelink message from the first UE; and The first resource for the multicast sidelink message is monitored via the receive beam.

96. The non-transitory computer-readable medium of claim 94, wherein the instructions are further executable by the one or more processors to cause the second UE to: Based at least in part on the multicast sidelink grant, a transmit beam for transmitting the multicast sidelink message to the third UE is determined, wherein the multicast sidelink message is transmitted to the third UE via the transmit beam.

97. An apparatus for wireless communication at a network device, comprising: means for receiving one or more beam training reports, each beam training report being associated with a beam training procedure between two or more UEs in a group of user equipments UE, the group of UEs comprising a first UE, a second UE and a third UE; means for receiving, from the first UE, a sidelink scheduling request for multicast communication between the group of UEs; as well as and means for sending a multicast sidelink grant indicating a first resource and a second resource based at least in part on the sidelink scheduling request and at least in part on the one or more beam training reports, the first resource being allocated for sending a multicast sidelink message from the first UE to the second UE, and the second resource being allocated for sending the multicast sidelink message from the second UE to the third UE.

98. The apparatus of claim 97, further comprising: Means for generating a connection map associated with the UE group based at least in part on the one or more beam training reports, wherein the connection map indicates link quality between the two or more UEs in the UE group, wherein the multicast side link authorization is based at least in part on the connection map.

99. The apparatus of claim 97, wherein the means for receiving the one or more beam training reports comprises: means for receiving a first beam training report from the first UE, the first beam training report being associated with a first beam training procedure between the first UE and at least one UE in the group of UEs; as well as Means for receiving a second beam training report from the second UE, the second beam training report being associated with a second beam training procedure between the second UE and the at least one UE in the group of UEs.

100. An apparatus for wireless communication at a first user equipment UE, comprising: means for sending, to a network device, beam training reports associated with two or more UEs in a UE group, the UE group comprising a first UE, a second UE, and a third UE; means for sending a sidelink request for multicast communication between the group of UEs to the network device; means for receiving, from the network device, a multicast sidelink grant indicating first resources for sending a multicast sidelink message from the first UE to the second UE based at least in part on the sidelink request and at least in part on the beam training report; as well as Means for sending the multicast sidelink message to the second UE via the first resource.

101. The apparatus of claim 100, further comprising: means for determining a transmit beam for transmitting the multicast side link message based at least in part on the multicast side link grant, wherein the multicast side link message is transmitted to the second UE via the transmit beam.

102. The apparatus of claim 100, wherein the multicast sidelink grant further indicates second resources allocated for sending the multicast sidelink message from the second UE to the third UE.

103. An apparatus for performing wireless communication at a second user equipment UE, comprising: means for sending, to a network device, a beam training report associated with two or more UEs in a UE group, the UE group including at least a first UE, the second UE, and a third UE; means for receiving from the network device a multicast side link grant indicating first resources allocated for sending a multicast side link message from the first UE to the second UE and second resources for sending the multicast side link message from the second UE to the third UE; means for receiving the multicast sidelink message from the first UE via the first resource; as well as means for sending the multicast sidelink message to the third UE via the second resource based at least in part on receiving the multicast sidelink message from the first UE.

104. The apparatus of claim 103, further comprising: means for determining a receive beam for receiving the multicast sidelink message from the first UE based at least in part on the multicast sidelink grant; as well as Means for monitoring the first resource for the multicast sidelink message via the receive beam.

105. The apparatus of claim 103, further comprising: means for determining a transmit beam for transmitting the multicast sidelink message to the third UE based at least in part on the multicast sidelink grant, wherein the multicast sidelink message is transmitted to the third UE via the transmit beam.

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