Joint transmit and receive beamsweep for side links

Abstract

Methods, systems, and apparatus for wireless communication are described. A served user equipment (UE) can receive a first configuration signal that configures the served UE to have a first transmit beam resource and a second transmit beam resource for the served UE to perform beam management on a sidelink channel. The served UE can identify a mode for performing beam management using the first transmit beam resource and the second transmit beam resource, at least in part, based on the first configuration signal. The served UE can perform beam management on a sidelink channel using the first transmit beam resource and the second transmit beam resource according to this mode.

Description

[0001] Cross-references

[0002] This patent application claims priority to U.S. Patent Application No. 17 / 103,232, filed November 24, 2020, entitled “JOINT TRANSMIT AND RECEIVE BEAM-SWEEPING FOR SIDELINK”, filed by AKKARAKARAN et al., which claims the benefit of U.S. Provisional Patent Application No. 62 / 941,685, filed November 27, 2019, entitled “JOINT TRANSMIT AND RECEIVE BEAM-SWEEPING FOR SIDELINK”, which has been assigned to the assignee of this application.

[0003] background

[0004] The following text generally refers to wireless communication, and in particular to joint transmit and receive beamsweeping for side links.

[0005] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, message sending and receiving, broadcasting, and so on. These systems can 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-A 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 can employ various technologies, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), or Discrete Fourier Transform Extended Orthogonal Frequency Division Multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include several base stations or network access nodes, each supporting communication from multiple communication devices simultaneously, which may also be referred to as User Equipment (UE).

[0006] Overview

[0007] The described technology relates to improved methods, systems, devices, and apparatuses supporting joint transmit and receive beamsweeping for sidelinks. In general, the described technology provides various mechanisms to support wireless communication in wireless networks. Broadly speaking, aspects of the described technology implement improved beam management techniques on sidelink channels. For example, at least to some extent, two user equipments (UEs) can communicate on a sidelink channel using beamforming transmissions. A first UE can be configured or otherwise act as a scheduling UE (e.g., a control UE) for sidelink communication, and in this context, the first UE can thus be regarded as a serving UE (e.g., or a control UE). A second UE can be configured or otherwise act as a scheduled UE for sidelink communication, and in this context, the second UE can thus be regarded as a served UE. The served UE can also be served (e.g., controlled) by any controlling sidelink node (e.g., a base station, control UE, master UE, anchor UE, etc.) coordinating the sidelink scheduling. In some aspects, the serving UE may transmit or otherwise provide configuration signals (e.g., Radio Resource Control (RRC) configuration or reconfiguration signals, Downlink Control Information (DCI) signals, etc.) that configure the serving UE to have multiple periodic / semi-persistent reference signal resources. For example, the serving UE may configure the serving UE to have a first transmit beam resource and a second transmit beam resource for the serving UE to use for beam management on a sidelink channel. In some other examples, a base station (e.g., or a control sidelink node) may configure the serving UE, which in turn may configure the serving UE. In still other examples, the serving UE may receive sidelink configuration from the base station, but may receive one or more reference signals from the serving UE. In any case, the serving UE may identify or otherwise determine a mode for performing beam management using the first and second transmit beam resources. The serving UE may perform beam management on a sidelink channel according to this mode and using the first and second transmit beam resources. The served UE may transmit or otherwise convey instructions for feedback messages to the serving UE (e.g., or the base station) based on the beam management results.

[0008] A method for performing wireless communication at a served UE is described. The method may include: receiving a first configuration signal configuring the served UE to have a first transmit beam resource and a second transmit beam resource for the served UE to perform beam management on a sidelink channel; identifying a mode for performing beam management using the first transmit beam resource and the second transmit beam resource based on the first configuration signal; and performing beam management on a sidelink channel using the first transmit beam resource and the second transmit beam resource according to the mode.

[0009] An apparatus for performing wireless communication at a served UE is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. These instructions may be executable by the processor to cause the apparatus to: receive a first configuration signal configuring the served UE to have a first transmit beam resource and a second transmit beam resource for the served UE to perform beam management on a sidelink channel; identify a mode for performing beam management using the first transmit beam resource and the second transmit beam resource based on the first configuration signal; and perform beam management on the sidelink channel using the first transmit beam resource and the second transmit beam resource according to the mode.

[0010] Another apparatus for wireless communication at a served UE is described. The apparatus may include means for: receiving a first configuration signal configuring the served UE to have a first transmit beam resource and a second transmit beam resource for the served UE to perform beam management on a sidelink channel; identifying a mode for performing beam management using the first transmit beam resource and the second transmit beam resource based on the first configuration signal; and performing beam management on a sidelink channel using the first transmit beam resource and the second transmit beam resource according to the mode.

[0011] A non-transient computer-readable medium is described, storing code for wireless communication at a served UE. The code may include instructions executable by a processor for: receiving a first configuration signal configuring the served UE to have a first transmit beam resource and a second transmit beam resource for beam management on a sidelink channel; identifying a mode for performing beam management using the first transmit beam resource and the second transmit beam resource based on the first configuration signal; and performing beam management on the sidelink channel using the first transmit beam resource and the second transmit beam resource according to the mode.

[0012] In some examples of the methods, apparatus (devices), and non-transient computer-readable media described herein, performing beam management may include operations, features, means, or instructions for: monitoring reference signal transmission based on a first transmit beam resource using a first receive beam of the served UE, and monitoring reference signal transmission based on a second transmit beam resource, including repeated transmissions using the same antenna port. Some examples of the methods, apparatus (devices), and non-transient computer-readable media described herein may further include operations, features, means, or instructions for: monitoring using a first receive beam, and monitoring concurrently, coherently, or using time-division multiplexing by sweeping a set of receive beams.

[0013] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for alternating between monitoring using a first receive beam and monitoring by sweeping a set of receive beams between successive symbols, or successive mini-slots, or successive slots, or successive subframes, or combinations thereof.

[0014] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for: transmitting a first feedback message identifying the result of monitoring using a first receive beam; and transmitting a second feedback message identifying the result of monitoring by sweeping a set of receive beams.

[0015] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for: monitoring based on a first receive beam of the served UE; identifying one or more transmit beam candidates based on reference signal transmission; transmitting a feedback message identifying the one or more transmit beam candidates; and resetting a second transmit beam resource based on the feedback message.

[0016] In some examples of the methods, apparatus (devices), and non-transient computer-readable media described herein, performing beam management may include operations, features, means, or instructions for: monitoring a first reference signal transmission based on a first transmit beam resource, including a first repeated transmission using the same first antenna port, and monitoring a second reference signal transmission based on a second transmit beam resource, including a second repeated transmission using the same second antenna port. Some examples of the methods, apparatus (devices), and non-transient computer-readable media described herein may further include operations, features, means, or instructions for: monitoring the first reference signal transmission concurrently, coherently, or using time-division multiplexing with the monitoring of the second reference signal transmission by sweeping the received beam set of the served UE.

[0017] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for alternating between monitoring the transmission of a first reference signal and monitoring the transmission of a second reference signal between successive symbols, or successive mini-slots, or successive slots, or successive subframes, or combinations thereof.

[0018] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for: transmitting a first feedback message identifying the result of monitoring the transmission of a first reference signal; and transmitting a second feedback message identifying the result of monitoring the transmission of a second reference signal.

[0019] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, performing beam management may include operations, features, means or instructions for: monitoring reference signal transmissions from a serving UE based on a first transmit beam resource using a first receive beam of the serving UE, and monitoring multiple instances of a second reference signal transmission based on a second transmit beam resource, including repeated transmissions using the same antenna port.

[0020] Examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for monitoring the transmission of a reference signal and for multiple instances of monitoring the transmission of a second reference signal concurrently, sequentially or using time-division multiplexing.

[0021] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for alternating between multiple instances of monitoring the transmission of a first reference signal and monitoring the transmission of a second reference signal between successive symbols, or successive mini-slots, or successive slots, or successive subframes, or combinations thereof.

[0022] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for: transmitting a first feedback message identifying the result of monitoring a reference signal transmission; transmitting a second feedback message identifying the result of monitoring multiple instances of a second reference signal transmission; and resetting a second transmit beam resource based on at least one of the first feedback message, the second feedback message, or a combination thereof.

[0023] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, a first transmit beam resource corresponds to a first set of reference signal resources, and a second transmit beam resource corresponds to a second set of reference signal resources.

[0024] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, a first configuration signal configures a first transmit beam resource as a first reference signal resource set and a second reference signal resource set, and configures a second transmit beam resource as a third reference signal resource set, wherein the second reference signal resource set and the third reference signal resource set are configured with repetition enabled for beam management.

[0025] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the first transmit beam resource includes a first channel state information reference signal (CSI-RS) resource set, and the second transmit beam resource includes a second CSI-RS resource set.

[0026] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, a first transmit beam resource includes a first subset of a CSI-RS resource set, and a second transmit beam resource includes a second subset of that CSI-RS resource set.

[0027] A wireless communication method is described. The method may include: transmitting a first configuration signal that configures a served UE to have a first transmit beam resource and a second transmit beam resource for the served UE to perform beam management on a sidelink channel; using the first transmit beam resource to transmit one or more first reference signals and using the second transmit beam resource to transmit one or more second reference signals; and receiving a feedback message based on the transmission of the one or more first reference signals, the one or more second reference signals, or both.

[0028] An apparatus for wireless communication is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. These instructions may be executed by the processor to cause the apparatus to: transmit a first configuration signal configuring a served UE to have a first transmit beam resource and a second transmit beam resource for the served UE to perform beam management on a sidelink channel; transmit one or more first reference signals using the first transmit beam resource and transmit one or more second reference signals using the second transmit beam resource; and receive a feedback message based on the transmission of the one or more first reference signals, the one or more second reference signals, or both.

[0029] Another device for wireless communication is described. The device may include means for: transmitting a first configuration signal that configures a served UE to have a first transmit beam resource and a second transmit beam resource for the served UE to perform beam management on a sidelink channel; using the first transmit beam resource to transmit one or more first reference signals and using the second transmit beam resource to transmit one or more second reference signals; and receiving a feedback message based on the transmission of the one or more first reference signals, the one or more second reference signals, or both.

[0030] A non-transient computer-readable medium storing code for wireless communication is described. The code may include instructions executable by a processor to: transmit a first configuration signal configuring a served UE to have a first transmit beam resource and a second transmit beam resource for the served UE to perform beam management on a sidelink channel; use the first transmit beam resource to transmit one or more first reference signals and use the second transmit beam resource to transmit one or more second reference signals; and receive a feedback message based on the transmission of the one or more first reference signals, the one or more second reference signals, or both.

[0031] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for: selecting at least one third transmit beam resource based on the feedback message, and transmitting a second configuration signal to the served UE, the second configuration signal identifying these third transmit beam resources as alternatives to the first transmit beam resource or the second transmit beam resource.

[0032] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, receiving a feedback message may include operations, features, means, or instructions for receiving a first feedback message based on the one or more first reference signals and for receiving a second feedback message based on the one or more second reference signals.

[0033] In some examples of the methods, apparatus (devices), and non-transient computer-readable media described herein, the transmission of the one or more first reference signals and the one or more second reference signals may be concurrent, coherent, or time-division multiplexed. In some examples of the methods, apparatus (devices), and non-transient computer-readable media described herein, the transmission of the one or more first reference signals and the one or more second reference signals may be performed between successive symbols, or successive mini-slots, or successive slots, or successive subframes, or combinations thereof.

[0034] In some examples of the methods, apparatus (devices), and non-transient computer-readable media described herein, a first transmit beam resource includes a first CSI-RS resource set, and a second transmit beam resource includes a second CSI-RS resource set. In some examples of the methods, apparatus (devices), and non-transient computer-readable media described herein, a first transmit beam resource includes a first subset of the CSI-RS resource set, and a second transmit beam resource includes a second subset of the CSI-RS resource set. Brief description of the attached diagram

[0036] Figure 1 Examples of wireless communication systems that support joint transmit and receive beamsweeping for sidelinks according to various aspects of this disclosure are explained.

[0037] Figure 2 Examples of wireless communication systems that support joint transmit and receive beamsweeping for sidelinks according to various aspects of this disclosure are explained.

[0038] Figure 3 Examples of beam management configurations for joint transmit and receive beam sweeping of sidelinks, supported by various aspects of this disclosure, are explained.

[0039] Figure 4A and Figure 4B Examples of beam management configurations for joint transmit and receive beam sweeping of sidelinks, supported by various aspects of this disclosure, are explained.

[0040] Figure 5 Examples of beam management configurations for joint transmit and receive beam sweeping of sidelinks, supported by various aspects of this disclosure, are explained.

[0041] Figure 6 An example of a process for joint transmit and receive beam sweeping of a side link, supported by various aspects of this disclosure, is explained.

[0042] Figure 7 and Figure 8 A block diagram of an apparatus for joint transmit and receive beam sweeping for a side link, according to various aspects of this disclosure, is shown.

[0043] Figure 9 A block diagram of a communication manager supporting joint transmit and receive beam sweep for a side link, according to various aspects of this disclosure, is shown.

[0044] Figure 10 A diagram of a system including equipment supporting joint transmit and receive beam sweep for side links, according to various aspects of this disclosure, is shown.

[0045] Figures 11 to 15A flowchart illustrating a method for joint transmit and receive beam sweeping for a side link, according to various aspects of this disclosure, is shown.

[0046] Detailed description

[0047] At least to some extent, wireless communication using beamforming technology requires participating wireless devices to perform beam management to identify and maintain active beams for communication. Beam management may involve one wireless device transmitting a beamformed reference signal, while another wireless device identifies candidate beams based on these beamformed transmissions. This process can continue using increasingly narrow beamformed transmissions until a preferred or optimal beam is identified (e.g., the optimal transmit beam at the transmitting device and the optimal receive beam at the receiving device). However, such techniques are typically performed in a step-by-step manner involving reference signal transmission, feedback message exchange, and the identification and configuration of new beams. This iterative process is resource-intensive (e.g., based on exchanging multiple configuration and feedback messages) and takes a considerable amount of time to complete or maintain. This approach can be even more problematic in scenarios where two UEs are communicating on a sidelink channel. For example, beam management between two UEs must take into account the fact that both UEs are likely to be mobile and (in some scenarios) experiencing high-speed movement. This can frustrate such beam management techniques, potentially leading to a loss of communication between the two UEs.

[0048] The aspects of this disclosure are initially described in the context of wireless communication systems. Broadly speaking, the aspects of the described techniques implement improved beam management techniques on sidelink channels. For example, at least to some extent, two UEs can communicate on a sidelink channel using beamforming transmission. One UE can be configured or otherwise act as a scheduling UE for sidelink communication, which in this context can be considered a serving UE. Another UE can be configured or otherwise act as a scheduled UE for sidelink communication, which in this context can be considered a served UE. The served UE can also be served (e.g., controlled) by any controlling sidelink node (e.g., base station, controlling UE, primary UE, anchor UE, etc.) coordinating sidelink scheduling. In some aspects, the serving UE can transmit or otherwise provide configuration signals (e.g., Radio Resource Control (RRC) configuration or reconfiguration signals, Downlink Control Information (DCI) signals, etc.) that configure the served UE to have multiple periodic / semi-persistent reference signal resources. For example, a serving UE may configure a serving UE to have a first transmit beam resource and a second transmit beam resource for the serving UE to perform beam management on a sidelink channel. In some other examples, a base station may configure the serving UE (e.g., via a downlink channel), which in turn may configure the serving UE (e.g., via a sidelink channel). In still other examples, the serving UE may receive configuration from the base station and may receive reference signals from the serving UE. In any case, the serving UE may identify or otherwise determine a mode for performing beam management using the first and second transmit beam resources. The serving UE may perform beam management on the sidelink channel according to this mode and using the first and second transmit beam resources. The serving UE may transmit or otherwise convey instructions for feedback messages to the serving UE (e.g., or the base station) based on the beam management results.

[0049] The various aspects of this disclosure are further explained and described by way of and with reference to apparatus diagrams, system diagrams and flowcharts relating to joint transmit and receive beam sweep for side links.

[0050] Figure 1Examples of a wireless communication system 100 supporting joint transmit and receive beamsweep for sidelinks according to various aspects of this disclosure are described. The wireless communication system 100 includes a base station 105, a user interface unit (UE) 115, and a core network 130. In some examples, the wireless communication system 100 may be a Long Term Evolution (LTE) network, an Advanced LTE (LTE-A) network, an LTE-A Pro network, or a New Radio (NR) network. In some cases, the wireless communication system 100 may support enhanced broadband communication, ultra-reliable (e.g., mission-critical) communication, low latency communication, or communication with low-cost and low-complexity devices.

[0051] Base station 105 can wirelessly communicate with UE 115 via one or more base station antennas. Base station 105 described herein may include, or may be referred to by those skilled in the art as, a base transceiver station, radio base station, access point, radio transceiver, B-node, evolved B-node (eNB), next-generation B-node, or gigabit B-node (any of which may be referred to as gNB), home B-node, home evolved B-node, or any other suitable term. Wireless communication system 100 may include different types of base station 105 (e.g., macrocell base station or small cell base station). UE 115 described herein may be able to communicate with various types of base station 105 and network equipment (including macro eNB, small cell eNB, gNB, relay base station, etc.).

[0052] Each base station 105 may be associated with a specific geographic coverage area 110, within which communication with various UEs 115 is supported. Each base station 105 may provide communication coverage to the corresponding geographic coverage area 110 via a communication link 125, and the communication link 125 between the base station 105 and the UE 115 may utilize one or more carriers. The communication link 125 shown in the wireless communication system 100 may include uplink transmission from the UE 115 to the base station 105, or downlink transmission from the base station 105 to the UE 115. Downlink transmission may also be referred to as forward link transmission, and uplink transmission may also be referred to as reverse link transmission.

[0053] The geographic coverage area 110 of base station 105 can be divided into sectors that constitute part of the geographic coverage area 110, and each sector can be associated with a cell. For example, each base station 105 can provide communication coverage to macrocells, small cells, hotspots, or other types of cells, or various combinations thereof. In some examples, base station 105 can be mobile and thus provide communication coverage to mobile geographic coverage areas 110. In some examples, different geographic coverage areas 110 associated with different technologies can overlap, and overlapping geographic coverage areas 110 associated with different technologies can be supported by the same base station 105 or different base stations 105. The wireless communication system 100 can include, for example, heterogeneous LTE / LTE-A / LTE-A Pro or NR networks, wherein different types of base stations 105 provide coverage to various geographic coverage areas 110.

[0054] The term "cell" refers to a logical communication entity used to communicate with base station 105 (e.g., on a carrier) and may be associated with identifiers to distinguish adjacent cells operating via the same or different carriers (e.g., Physical Cell Identifier (PCID), Virtual Cell Identifier (VCID)). In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types that provide access for different types of devices (e.g., Machine-Type Communication (MTC), Narrowband Internet of Things (NB-IoT), Enhanced Mobile Broadband (eMBB), or others). In some cases, the term "cell" may refer to a portion (e.g., a sector) of the geographical coverage area 110 on which the logical entity operates.

[0055] Each UE 115 can be distributed throughout the wireless communication system 100, and each UE 115 can be stationary or mobile. UE 115 may also be referred to as a mobile device, wireless device, remote device, handheld device, or subscriber device, or any other suitable term, where "device" may also be referred to as a unit, station, terminal, or client. UE 115 can also be a personal electronic device, such as a cellular phone, personal digital assistant (PDA), tablet computer, laptop computer, or personal computer. In some examples, UE 115 may also refer to a wireless local loop (WLL) station, Internet of Things (IoT) device, Internet of Everything (IoE) device, or MTC device, etc., which can be implemented in various items (such as appliances, vehicles, instruments, etc.).

[0056] Some UE 115 devices (such as MTC or IoT devices) can be low-cost or low-complexity devices and can provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC can refer to data communication technologies that allow devices to communicate with each other or with base station 105 without human intervention. In some examples, M2M communication or MTC may include communication from devices that have integrated sensors or meters to measure or capture information and relay that information to a central server or application that can utilize the information or present it to people interacting with the program or application. Some UE 115 devices may be designed to collect information or enable automated machine behavior. Examples of applications for MTC devices include: smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wilderness survival monitoring, weather and geographic event monitoring, queue management and tracking, remote security sensing, physical access control, and transaction-based commercial toll collection.

[0057] Some UEs 115 can be configured to operate in reduced-power modes, 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 can be performed at a reduced peak rate. Other power-saving techniques for UE 115 include entering a power-saving "deep sleep" mode when not engaged in active communication, or operating on limited bandwidth (e.g., according to narrowband communication). In some cases, UE 115 can be designed to support critical functions (e.g., mission-critical functions), and the wireless communication system 100 can be configured to provide ultra-reliable communication for these functions.

[0058] In some scenarios, UE 115 may also be able to communicate directly with other UE 115 (e.g., using peer-to-peer (P2P) or device-to-device (D2D) protocols). One or more UEs in a group of UEs 115 utilizing D2D communication may be within the geographic coverage area 110 of base station 105. Other UEs 115 in the group may be outside the geographic coverage area 110 of base station 105 or may be unable to receive transmissions from base station 105 for other reasons. In some scenarios, groups of UEs 115 communicating via D2D communication may utilize a one-to-many (1:M) system, where each UE 115 transmits to every other UE 115 in the group. In some scenarios, base station 105 facilitates the scheduling of resources for D2D communication. In other scenarios, D2D communication is performed between the individual UEs 115 without involving base station 105.

[0059] Base station 105 can communicate with core network 130 and with each other. For example, base station 105 can interface with core network 130 via backhaul link 132 (e.g., via S1, N2, N3 or other interfaces). Base stations 105 can communicate with each other directly (e.g., directly between base stations 105) or indirectly (e.g., via core network 130) on backhaul link 134 (e.g., via X2, Xn or other interfaces).

[0060] Core network 130 provides user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. Core network 130 may be an evolved packet core (EPC), which may include at least one Mobility Management Entity (MME), at least one Serving Gateway (S-GW), and at least one Packet Data Network (PDN) Gateway (P-GW). The MME manages non-access stratum (e.g., control plane) functions, such as mobility, authentication, and bearer management of UE 115 served by base station 105 associated with the EPC. User IP packets can be delivered via the S-GW, which itself may connect to the P-GW. The P-GW provides IP address allocation and other functions. The P-GW may connect to network operator IP services. Operator IP services may include access to the Internet, intranets, IP Multimedia Subsystem (IMS), or packet-switched (PS) streaming services.

[0061] At least some network devices (such as base station 105) may include sub-components, such as access network entities, which may be examples of access node controllers (ANCs). Each access network entity may communicate with each UE 115 through several other access network transport entities, which may be referred to as a radio headend, a smart radio headend, or a transmit / receive point (TRP). In some configurations, the various functions of each access network entity or base station 105 may be distributed across various network devices (e.g., radio headends and access network controllers) or combined into a single network device (e.g., base station 105).

[0062] Wireless communication system 100 can operate using one or more frequency bands, typically in the range of 300 MHz to 300 GHz. Generally, the 300 MHz to 3 GHz band is referred to as the Ultra High Frequency (UHF) band or decimeter band because the wavelengths range from approximately 1 decimeter to 1 meter. UHF waves can be blocked or redirected by buildings and environmental features. However, these waves can penetrate various structures sufficiently for macrocells to provide service to UE 115 located indoors. Compared to transmissions using smaller frequencies and longer waves in the High Frequency (HF) or Very High Frequency (VHF) portions of the spectrum below 300 MHz, UHF wave transmission can be associated with smaller antennas and shorter ranges (e.g., less than 100 km).

[0063] The wireless communication system 100 can also operate in the ultra-high frequency (SHF) zone using a frequency band from 3 GHz to 30 GHz (also known as the centimeter band). The SHF zone includes frequency bands that can be used opportunistically by devices that can tolerate interference from other users (such as the 5 GHz Industrial, Scientific and Medical (ISM) band).

[0064] The wireless communication system 100 can also operate in extremely high frequency (EHF) zoning (e.g., from 30 GHz to 300 GHz), also known as the millimeter band. In some examples, the wireless communication system 100 can support millimeter-wave (mmW) communication between the UE 115 and the base station 105, and the EHF antennas of the corresponding devices can be even smaller and more closely spaced than UHF antennas. In some cases, this can facilitate the use of antenna arrays within the UE 115. However, the propagation of EHF transmissions may suffer from even greater atmospheric attenuation and shorter range than SHF or UHF transmissions. The techniques disclosed herein can be employed across transmissions using one or more different frequency zonings, and the frequency band usage specified across these frequency zonings may vary by country or regulatory authority.

[0065] In some scenarios, wireless communication system 100 may utilize both licensed and unlicensed radio spectrum bands. For example, wireless communication system 100 may employ License-Assisted Access (LAA), LTE Unlicensed (LTE-U) radio access technology, or NR technology in unlicensed frequency bands (such as the 5 GHz ISM band). When operating in unlicensed radio spectrum bands, wireless devices (such as base station 105 and UE 115) may employ a Listen-Before-Talk (LBT) protocol to ensure the frequency channel is open before transmitting data. In some scenarios, operation in unlicensed frequency bands may be based on carrier aggregation configurations (e.g., LAA) in coordination with component carriers operating in licensed frequency bands. Operation in unlicensed spectrum may include downlink transmission, uplink transmission, peer-to-peer transmission, or a combination thereof. Duplexing in unlicensed spectrum may be based on Frequency Division Duplex (FDD), Time Division Duplex (TDD), or a combination thereof.

[0066] In some examples, base station 105 or UE 115 may be equipped with multiple antennas, which can be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. For example, wireless communication system 100 may use a transmission scheme between a transmitting device (e.g., base station 105) and a receiving device (e.g., UE 115), wherein the transmitting device is equipped with multiple antennas and the receiving device is equipped with one or more antennas. MIMO communication may employ multipath signal propagation to increase spectral efficiency by transmitting or receiving multiple signals via different spatial layers, which may be referred to as spatial multiplexing. For example, the transmitting device may transmit multiple signals via different antennas or different combinations of antennas. Similarly, the receiving device may receive multiple signals via different antennas or different combinations of antennas. Each of these 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. Different spatial layers may be associated with different antenna ports used for channel measurement and reporting. MIMO technology includes single-user MIMO (SU-MIMO), in which multiple spatial layers are transmitted to the same receiving device; and multi-user MIMO (MU-MIMO), in which multiple spatial layers are transmitted to multiple devices.

[0067] Beamforming (also known as spatial filtering, directional transmission, or directional reception) is a signal processing technique used at a transmitting or receiving device (e.g., base station 105 or UE 115) to shape or guide an antenna beam (e.g., a transmit beam or a receive beam) along a spatial path between the transmitting and receiving devices. Beamforming can be achieved by combining signals transmitted via antenna elements of an antenna array, such that signals propagating relative to a particular orientation of the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to the signals transmitted via the antenna elements may include the transmitting or receiving device applying specific amplitude and phase shifts to the signals carried via each antenna element associated with that device. The adjustments associated with each antenna element may be defined by a beamforming weight set associated with a particular orientation (e.g., relative to the antenna array of the transmitting or receiving device, or relative to some other orientation).

[0068] In one example, base station 105 may use multiple antennas or antenna arrays to perform beamforming operations for directional communication with UE 115. For example, some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted multiple times by base station 105 in different directions. This may include a signal being transmitted according to different beamforming weight sets associated with different transmission directions. Transmissions in different beam directions can be used (e.g., by base station 105 or receiving equipment, such as UE 115) to identify the beam direction used by base station 105 for subsequent transmission and / or reception.

[0069] 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., the direction associated with the receiving device (such as UE 115). In some examples, the beam direction associated with transmission along a single beam direction may be determined at least in part based on the signals transmitted in different beam directions. For example, UE 115 may receive one or more signals transmitted by base station 105 in different directions, and UE 115 may report to base station 105 an indication of the signals it received with the highest signal quality or other acceptable signal quality. Although these techniques are described with reference to signals transmitted by base station 105 in one or more directions, UE 115 may use similar techniques to transmit signals multiple times in different directions (e.g., to identify the beam direction used by UE 115 for subsequent transmission or reception) or to transmit signals in a single direction (e.g., to transmit data to the receiving device).

[0070] A receiver device (e.g., UE 115, which may be an example of an mmW receiver device) may attempt multiple receive beams when receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from base station 105. For example, the receiver device may attempt multiple reception directions by: receiving via different antenna subarrays; processing received signals according to different antenna subarrays; receiving according to different sets of receive beamforming weights applied to signals received at multiple antenna elements of the antenna array; or processing received signals according to different sets of receive beamforming weights applied to signals received at multiple antenna elements of the antenna array, any of which may be referred to as “listening” according to different receive beams or reception directions. In some examples, the receiver device may use a single receive beam to receive along a single beam direction (e.g., when a data signal is received). A single receiving beam can be aligned on a beam direction determined at least in part based on listening to different receiving beam directions (e.g., a beam direction determined at least in part based on listening to multiple beam directions to have the highest signal strength, highest signal-to-noise ratio, or other acceptable signal quality).

[0071] In some cases, the antennas of base station 105 or UE 115 may be located within one or more antenna arrays that support MIMO operation or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may coexist at an antenna assembly (such as an antenna tower). In some cases, the antennas or antenna arrays associated with base station 105 may be located in different geographical locations. Base station 105 may have an antenna array with several rows and columns of antenna ports that base station 105 can use to support beamforming for communication with UE 115. Similarly, UE 115 may have one or more antenna arrays that support various MIMO or beamforming operations.

[0072] In some scenarios, the wireless communication system 100 may be a packet-based network operating according to a layered protocol stack. In the user plane, communication at the bearer or Packet Data Convergence Protocol (PDCP) layer may be IP-based. The Radio Link Control (RLC) layer performs packet segmentation and reassembly for communication on logical channels. The Media Access Control (MAC) layer performs priority handling and multiplexing of logical channels into transport channels. The MAC layer may also use Hybrid Automatic Repeat Request (HARQ) to provide retransmissions at the MAC layer, thereby improving link efficiency. In the control plane, the Radio Resource Control (RRC) protocol layer can provide the establishment, configuration, and maintenance of RRC connections between UE115 and base station 105 or core network 130 supporting user plane data radio bearers. At the physical layer, transport channels can be mapped to physical channels.

[0073] In some scenarios, UE 115 and base station 105 may support data retransmission to increase the likelihood of successful data reception. HARQ feedback is a technique to increase the likelihood of correctly receiving data on communication link 125. HARQ may include a combination of error detection (e.g., using Cyclic Redundancy Check (CRC)), forward error correction (FEC), and retransmission (e.g., Automatic Repeat Request (ARQ)). HARQ can improve MAC layer throughput in poor radio conditions (e.g., signal-to-noise ratio conditions). In some scenarios, the wireless device may support simultaneous time-slot HARQ feedback, where the device can provide HARQ feedback in a specific time slot for data received in previous symbols within that time slot. In other scenarios, the device may provide HARQ feedback in subsequent time slots or according to some other time interval.

[0074] The time interval in LTE or NR can be represented by a basic time unit (which may, for example, refer to the sampling period T). s = 1 / 30,720,000 seconds) is used as a multiple. The time interval of communication resources can be organized according to radio frames, each with a duration of 10 milliseconds (ms), where the frame period can be expressed as T. f =307,200T s Radio frames can be identified by System Frame Numbers (SFNs) ranging from 0 to 1023. Each frame may include 10 subframes numbered from 0 to 9, and each subframe may have a duration of 1 ms. Subframes may be further divided into two time slots, each with a duration of 0.5 ms, and each time slot may contain 6 or 7 modulation symbol periods (e.g., depending on the length of the cyclic prefix preceding each symbol period). Excluding the cyclic prefix, each symbol period may contain 2048 sampling periods. In some cases, a subframe may be the smallest scheduling unit of the wireless communication system 100 and may be referred to as a Transmission Time Interval (TTI). In other cases, the smallest scheduling unit of the wireless communication system 100 may be shorter than a subframe or may be dynamically selected (e.g., in a shortened TTI (sTTI) burst or in a selected component carrier using an sTTI).

[0075] In some wireless communication systems, time slots can be further divided into multiple mini-time slots containing one or more symbols. In some instances, the symbol or mini-time slot of a mini-time slot can be the smallest scheduling unit. For example, the duration of each symbol may vary depending on the subcarrier spacing or operating frequency band. Furthermore, some wireless communication systems can implement time slot aggregation, where multiple time slots or mini-time slots are aggregated together and used for communication between UE 115 and base station 105.

[0076] The term "carrier" refers to a set of radio frequency spectrum resources having a defined physical layer structure for supporting communications on communication link 125. For example, a carrier of communication link 125 may include a portion of a radio spectrum band operating according to physical layer channels for a given radio access technology. Each physical layer channel may carry user data, control information, or other signaling. A carrier may be associated with a predefined frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute Radio Frequency Channel Number (EARFCN)) and may be located according to a channel grid for discovery by UE 115. A carrier may be downlink or uplink (e.g., in FDD mode), or configured to carry both downlink and uplink communications (e.g., in TDD mode). In some examples, the signal waveform transmitted on a carrier may include multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques such as Orthogonal Frequency Division Multiplexing (OFDM) or Discrete Fourier Transform Extended OFDM (DFT-S-OFDM)).

[0077] The carrier organization structure can vary depending on the radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). For example, communication on a carrier can be organized according to TTIs or time slots, each of which may include user data and control information or signaling supporting the decoding of the user data. A carrier may also include dedicated acquisition signaling (e.g., synchronization signals or system information) and control signaling coordinating carrier operation. In some examples (e.g., in a carrier aggregation configuration), a carrier may also have acquisition signaling or control signaling coordinating the operation of other carriers.

[0078] Physical channels can be multiplexed on a carrier using various techniques. Physical control channels and physical data channels can be multiplexed on a downlink carrier, for example, using time division multiplexing (TDM), frequency division multiplexing (FDM), or a hybrid TDM-FDM technique. In some examples, control information transmitted in the physical control channel can be distributed in a cascaded manner between different control regions (e.g., between a shared control region or shared search space and one or more UE-specific control regions or UE-specific search spaces).

[0079] A carrier may be associated with a specific bandwidth of the radio frequency spectrum, and in some examples, the carrier bandwidth may be referred to as the carrier or the “system bandwidth” of the wireless communication system 100. For example, the carrier bandwidth may be one of a plurality of predetermined bandwidths of a carrier for a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz). In some examples, each served UE 115 may be configured to operate on a portion or all of the carrier bandwidth. In other examples, some UEs 115 may be configured to operate using a narrowband protocol type associated with a predefined portion or range within the carrier (e.g., a set of subcarriers or RBs) (e.g., “in-band” deployment of a narrowband protocol type).

[0080] In systems employing MCM technology, a resource element may include a symbol period (e.g., the duration of a modulation symbol) and a subcarrier, where the symbol period and subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme). Therefore, the more resource elements UE 115 receives and the higher the order of the modulation scheme, the higher the data rate UE 115 can achieve. In MIMO systems, wireless communication resources can refer to a combination of radio frequency spectrum resources, temporal resources, and spatial resources (e.g., spatial layers), and using multiple spatial layers can further improve the data rate for communication with UE 115.

[0081] The devices of the wireless communication system 100 (e.g., base station 105 or UE 115) may have a hardware configuration that supports communication on a specific carrier bandwidth, or may be configurable to support communication on a single carrier bandwidth within a set of carrier bandwidths. In some examples, the wireless communication system 100 may include base station 105 and / or UE 115 that support simultaneous communication via carriers associated with more than one different carrier bandwidth.

[0082] The wireless communication system 100 can support communication with the UE 115 on multiple cells or carriers, a feature that may be referred to as carrier aggregation or multi-carrier operation. The UE 115 can be configured to have multiple downlink component carriers and one or more uplink component carriers according to the carrier aggregation configuration. Carrier aggregation can be used in conjunction with both FDD and TDD component carriers.

[0083] In some scenarios, the wireless communication system 100 may utilize enhanced component carrier (eCC). eCC can be characterized by one or more features, including a wider carrier or frequency channel bandwidth, shorter symbol duration, shorter TTI duration, or a modified control channel configuration. In some scenarios, eCC may be associated with carrier aggregation configurations or dual connectivity configurations (e.g., when multiple serving cells have suboptimal or non-ideal backhaul links). eCC can also be configured for use in unlicensed or shared spectrum (e.g., where more than one operator is permitted to use the spectrum). eCC characterized by a wide carrier bandwidth may include one or more segments that can be utilized by a UE 115 that is unable to monitor the entire carrier bandwidth or is otherwise configured to use a limited carrier bandwidth (e.g., to save power).

[0084] In some cases, eCC may utilize symbol durations different from those of other component carriers. This may include using a reduced symbol duration compared to that of other component carriers. A shorter symbol duration may be associated with increased spacing between adjacent subcarriers. Devices utilizing eCC (such as UE 115 or base station 105) can transmit wideband signals (e.g., based on frequency channels or carrier bandwidths of 20, 40, 60, 80 MHz, etc.) with a reduced symbol duration (e.g., 16.67 microseconds). The TTI in eCC may include one or more symbol periods. In some cases, the TTI duration (i.e., the number of symbol periods in the TTI) may be variable.

[0085] Wireless communication system 100 can be an NR system that can utilize any combination of licensed, shared, and unlicensed spectrum bands. The flexibility of eCC symbol duration and subcarrier spacing allows eCC to be used across multiple spectrums. In some examples, NR shared spectrum can improve spectrum utilization and spectral efficiency, particularly through dynamic vertical (e.g., across frequency domains) and horizontal (e.g., across time domains) sharing of resources.

[0086] UE 115 (e.g., when configured or otherwise acting as a served UE 115 communicating with a serving UE 115 on a sidelink channel) may receive a first configuration signal from the serving UE 115 on the sidelink channel, the first configuration signal configuring the served UE 115 to have a first transmit beam resource and a second transmit beam resource for the served UE 115 to use for beam management on the sidelink channel. The UE 115 may identify a mode for performing beam management using the first transmit beam resource and the second transmit beam resource, at least in part, based on the first configuration signal. The UE 115 may perform beam management on the sidelink channel according to this mode using the first transmit beam resource and the second transmit beam resource.

[0087] UE 115 (e.g., when configured or otherwise acting as a serving UE 115 communicating with a served UE 115 on a sidelink channel) may transmit a first configuration signal to the served UE 115 on the sidelink channel. This first configuration signal configures the served UE 115 to have a first transmit beam resource and a second transmit beam resource for the served UE 115 to use for beam management on the sidelink channel. The UE 115 may use the first transmit beam resource to transmit one or more first reference signals and use the second transmit beam resource to transmit one or more second reference signals. The UE 115 may receive feedback messages from the served UE based at least in part on the transmission of the one or more first reference signals and the one or more second reference signals.

[0088] Figure 2 Examples of a wireless communication system 200 supporting joint transmit and receive beamsweeping for a sidelink, according to various aspects of this disclosure, are described. In some examples, the wireless communication system 200 may implement aspects of the wireless communication system 100. The wireless communication system 200 may include a base station 205, a serving UE 210, and a served UE 215, which may be examples of the corresponding devices described herein. In some aspects, at least to some extent, the serving UE 210 and the served UE 215 may be communicating on a sidelink channel using beamforming transmission.

[0089] As described herein, serving UE 210 and served UE 215 may be performing wireless communication on a sidelink channel. In one mode, sidelink communication may be controlled by base station 205 (e.g., coordinated, scheduled, allocated, etc.). For example, base station 205 may receive information from serving UE 210 and / or served UE 215 indicating the need to perform sidelink communication, for example in scheduling requests, buffer status reports, etc. Accordingly, base station 205 may allocate appropriate resources and communicate those resources to serving UE 210 and / or served UE 215 in an authorization.

[0090] In another mode, the serving UE 210 can also be considered a control sidelink UE, such that the serving UE 210 acts as a scheduling entity for sidelink communication with the served UE 215. That is, the serving UE 210 can control (e.g., coordinate, schedule, allocate, etc.) sidelink communication with respect to performing sidelink communication between the served UE 215 and the serving UE 210. Accordingly, the serving UE 210 can schedule and allocate appropriate resources and communicate those resources to the served UE 215. In some cases, when the serving UE 210 and the served UE 215 (e.g., and one or more other UEs served or otherwise controlled by the serving UE 210) are outside the base station coverage, the serving UE 210 can be considered a control sidelink UE (for example, a programmable logic controller (PLC) in an Industrial Internet of Things (IIoT) scenario). The serving UE 210 can thus be designated as a primary UE or anchor UE and can act as a scheduling entity for the served UE 215 or any other UE controlled by the serving UE 210.

[0091] In some aspects, communication between base station 205, serving UE 210, and / or served UE 215 may be performed using at least some degree of beamforming transmission. For example, beamforming transmission may include, during communication, the transmitting device using one or more transmit beams and the receiving device using one or more receive beams. In some aspects, at least to some extent, sidelink communication between serving UE 210 and served UE 215 may also include beamforming transmission.

[0092] In some examples, base station 205 may manage or otherwise control one or more aspects of beam management for beamforming communication. Regarding sidelink communication, this may include serving UE 210 managing or otherwise controlling one or more aspects of beam management for sidelink communication. For example, base station 205 may manage beam management for serving UE 210, and serving UE 210 may manage beam management for served UE 215. For illustrative purposes only, the aspects of the techniques described herein will be implemented in a scenario where serving UE 210 acts as or is otherwise configured as a scheduling entity for communication with served UE 215 on a sidelink channel. Accordingly, the aspects of the described techniques support serving UE 210 controlling or otherwise managing aspects of beam management for sidelink communication.

[0093] Generally, such beam management techniques can utilize various transmit beams with decreasing beamwidths to identify or otherwise determine the optimal transmit / receive beam pair. For example, serving UE 210 may initially transmit an RRC configuration or reconfiguration message that can be used to configure a Channel State Information Reference Signal (CSI-RS) resource set. The CSI-RS resource set may correspond to a Synchronization Signal Block (SSB) waveform (which in some examples may use a P1 beam), which may be a wide-beam waveform. Serving UE 210 can then use the P1 beam to transmit (e.g., sweep) the SSB in an iterative manner. That is, serving UE 210 may use the P1 beam to sweep SSB transmission for each receive beam of the served UE 215. The served UE 215 may identify the optimal candidate P1 beam for each receive beam (e.g., based on Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), etc.). Similarly, the served UE 215 may identify its optimal receive beam corresponding to the candidate P1 beam. The served UE 215 may transmit a feedback message indicating the top N candidate P1 beams, where N is a positive integer value of 1 or greater. The serving UE 210 may identify or otherwise select the best or active P1 beam (e.g., the active P1 beam). Based on the identified P1 beams, the serving UE 210 may identify one or more P2 beams to be used for sidelink communication. The serving UE 210 may transmit RRC configuration signals to configure a set of CSI-RS resources that can spatially coexist with the active P1 beam (QCL). That is, the serving UE 210 may select a set of candidate P2 beams based on the feedback message and configure the served UE 215 to have these candidate P2 beams. A P2 beam generally refers to a beam with a narrower beamwidth relative to a P1 beam. P2 beams may typically be allocated for reference signal transmissions, such as CSI-RS transmissions using P2 beams.

[0094] Serving UE 210 can sweep all CSI-RS beams in the configured CSI-RS resource set (e.g., using CSI-RS transmissions from multiple P2 beams in the candidate P2 beam set). Served UE 215 can identify the top N candidate P2 beams based on CSI-RS transmissions using candidate P2 beams, where N is a positive integer value of 1 or greater. In some aspects, Served UE 215 can identify candidate P2 beams based on SSB transmissions swept using the candidate P2 beam set. Served UE 215 can then transmit another feedback message identifying the top N candidate P2 beams to Serving UE 210. Based on this second feedback message, Serving UE 210 can identify or otherwise select a serving or active CSI-RS beam (e.g., it can identify a P3 beam to be used for communication with Served UE 215). A P3 beam typically refers to a beam with a narrower beamwidth than a P1 beam.

[0095] Serving UE 210 can transmit CSI-RS data on a CSI-RS beam (e.g., the P3 beam). Served UE 215 can scan its receive beam to detect CSI-RS transmissions on the P3 beam to identify the optimal or active receive beam. Accordingly, serving UE 210 and served UE 215 can execute the beam management procedure to maintain an optimal (e.g., in terms of performance capabilities, RSRP, etc.) beam pair (which includes the P3 beam of serving UE 210 and the corresponding receive beam of served UE 215). Serving UE 210 and served UE 215 can use this beam pair for sidelink communication on the sidelink channel. Serving UE 210 and served UE 215 can continue to use the beam management technique to identify and select new active beam pairs for sidelink communication.

[0096] In some examples, the served UE 215 can receive sidelink communication information and beam management information from both the serving UE 210 and the base station 205. For example, the served UE 215 can receive sidelink configuration for sidelink communication from the base station 205, and can receive one or more sidelink reference signals (e.g., for beam sweeping) from the serving UE 210.

[0097] While this beam management approach may be suitable for base station 205, it can present difficulties in implementation between serving UE 210 and served UE 215. Specifically, base station 205 is typically fixed in location, while both serving UE 210 and served UE 215 may be mobile. Beam management is often more critical when both serving UE 210 and served UE 215 are mobile. That is, due to UE mobility, the frequency of changes in the optimal or active beam pair for either or both devices may be much greater. Therefore, the beam management techniques discussed above could be employed for both devices. However, this could lead to a significant increase in costs related to over-the-air message exchange and time. In the worst-case scenario, this could result in the complete loss of communication between serving UE 210 and served UE 215 on the sidelink channel.

[0098] Additionally, some wireless communication systems are configured such that only one periodic / semi-persistent CSI-RS resource set can be configured for beam management. This prevents the P1 / P2 (transmit beam sweep) and P3 (receive beam sweep) discussed above from being executed in parallel.

[0099] However, aspects of the described technology enable the P2 and P3 beam management technologies to be performed in parallel. For example, serving UE 210 can configure serving UE 215 to have a first transmit beam resource and a second transmit beam resource of serving UE 210. That is, serving UE 210 can transmit or otherwise communicate to serving UE 215 a first configuration signal (e.g., RRC configuration / reconfiguration signal, DCI, etc.) configuring CSI-RS resources on the first and second transmit beam resources. As an example, this may include the first transmit beam resource corresponding to a first CSI-RS resource set, and the second transmit beam resource corresponding to a second CSI-RS resource set (e.g., P2 / P3 beams). In another example, the first transmit beam resource may correspond to a first subset of the CSI-RS resource set, and the second transmit beam resource may correspond to a second subset of the CSI-RS resource set (e.g., P2 and / or P3a / b beams).

[0100] The served UE 215 can receive the configuration signal and identify the mode for performing beam management using the first transmit beam resources and the second transmit beam resources. That is, the served UE 215 can determine whether the first transmit beam resources and the second transmit beam resources correspond to different CSI-RS resource sets or to a subset of a CSI-RS resource set. Accordingly, the served UE 215 can perform beam management on the sidelink channel according to this mode and using the first and second transmit beam resources.

[0101] In one aspect, the mode may include the served UE 215 monitoring reference signal transmissions from the serving UE 210 on a first transmit beam resource and on a second transmit beam resource. That is, the configuration signal may configure P2 (e.g., a first transmit beam resource for a first CSI-RS transmission) and P3 (e.g., a second transmit beam resource for a second CSI-RS transmission) beams for the served UE 215. In some aspects, the served UE 215 monitoring the first transmit beam resource may include the served UE 215 using a first receive beam to monitor CSI-RS transmissions from the serving UE 210 using the P2 beam. In some aspects, the served UE 215 monitoring the second transmit beam resource may include the served UE 215 scanning the receive beam set to monitor CSI-RS transmissions from the serving UE 210 using the P3 beam. Monitoring can be performed concurrently (e.g., the served UE 215 can monitor both P2 and P3 beam CSI-RS transmissions) or sequentially (e.g., the served UE 215 can monitor P2 beam CSI-RS transmissions and then monitor P3 beam CSI-RS transmissions, or vice versa). In some aspects, monitoring can be performed at symbol boundaries, mini-slot boundaries, slot boundaries, subframe boundaries, etc.

[0102] On the other hand, this mode may include the served UE 215 monitoring reference signal transmissions from the serving UE 210 by sweeping its receive beam. That is, the configuration signal may configure two P3 beam sets (e.g., a first transmit beam resource corresponding to the P3a beam for CSI-RS transmission and a second transmit beam resource corresponding to the P3b beam for CSI-RS transmission). Accordingly, the served UE 215 may sweep the receive beam set to monitor a first instance of reference signal transmission using the first transmit beam resource (e.g., CSI-RS transmission using the P3a beam), and may sweep its receive beam to monitor a second instance of the reference signal transmission using the second transmit beam resource (e.g., CSI-RS transmission using the P3b beam).

[0103] In some aspects, the served UE 215 may transmit or otherwise convey one or more feedback messages during beam management procedures. These feedback messages may be transmitted according to this pattern and / or based on configured first and second transmit beam resources (e.g., to the serving UE 210, base station 205, or any serving or control-side link node). That is, the served UE 215 may transmit these feedback messages during beam management procedures based on the determination that the serving UE 210 needs to update one or more beams. For example, the served UE 215 may be performing beam management according to the techniques discussed herein and may determine that one or more of the active transmit and / or receive beams are being degraded, and / or new candidate transmit and / or receive beams have been identified. Accordingly, the serving UE 210 may identify or otherwise select new first and / or second transmit beam resources (e.g., a third transmit beam resource) for serving UE 210 based on any received feedback messages. The serving UE 210 may transmit another configuration signal (e.g., RRC configuration / reconfiguration signal, DCI, etc.) that identifies the updated transmit beam resource (e.g., third transmit beam resource).

[0104] Accordingly, aspects of the described technology support more frequent beam training on the sidelink (due to mobility at both serving UE 210 and served UE 215). CSI-RS resource sets (e.g., first and / or second transmit beam resources) are configured with a repeat flag indicating "on" for the same transmit beam. Although previous configurations prevent simultaneous use of both P2 and P3 beams for beam management, aspects of the described technology support simultaneous use of both P2 and P3 (or P3a / P3b) beams for beam management. In some aspects, repeat can be set to "off" for the P2 beam and "on" for the P3 beam.

[0105] In one example, two beam sets are configured (e.g., one configured with P2 and one configured with P3). P3 training can be "reset" whenever the transmit beam is reconfigured due to a P2 beam report.

[0106] In another example, two P3 beam sets are configured, each with repeated "on" operation, but effective for different transmit beams (e.g., P3a / P3b). Examples of modes with both repeated and transmit sweep modes include (aabbcc) and (abcabc) being on, depending on the temporal layout of resources in each transmit beam resource set. It should be noted that the two sets are examples for illustrative purposes only. That is, the first configuration signal can configure N transmit beam resource sets (where N is a positive integer 2 or greater). The serving UE 210 can decide among the configured sets based on how quickly the served UE 215 can switch its beams.

[0107] In some respects, mode interleaving (aabbcc or abcabc) can be performed at the symbol level, mini-slot level, slot level, multi-slot level, subframe level, etc., based on the resource allocation and periodicity assigned in each set.

[0108] In another option, there may be multiple sets of transmit beam resources configured by a first configuration signal. For example, the first transmit beam resources may correspond to a first set of multiple reference signal resources (e.g., multiple P2 beams), and the second transmit beam resource set may correspond to a second set of multiple reference signal resources (e.g., multiple P3 beams).

[0109] In some respects, one or more of the options discussed above can allow for more flexible repetitive configuration. For example, some configurations can support repeatedly setting all resources with the same transmit beam to "on". Alternatively, some options can have subsets of resources containing the same transmit beam, and different subsets of resources can mean or refer to different transmit beams. These subsets can be explicitly indicated using resource indexes or resource assignments (e.g., based on occupied OFDM symbols and / or time slots) and can use pattern indicators such as aabbcc, abcabc, etc.

[0110] That is, through resource indexing, resource assignment, etc., a transmit beam resource set can have two CSI-RS resource sets for the P2 and P3 beams, and more than one CSI-RS resource set for the P3 beam. In the previous configuration, repeating each resource set made it impossible to put the CSI-RS resources for the P2 and P3 beams into one set, nor could it put more than one CSI-RS beam for P3 into one set. However, according to various aspects of the described technology, the first configuration signal can configure P2 to repeat "off" (because more than one serving UE 210 beam is swept) and P3 to repeat "on" (because the serving UE 210 beam is fixed (e.g., only one CSI-RS beam)).

[0111] Figure 3 Examples of beam management configuration 300 supporting joint transmit and receive beam sweeping for sidelinks, according to various aspects of this disclosure, are described. In some examples, beam management configuration 300 may implement aspects of wireless communication systems 100 and / or 200. The aspects of beam management configuration 300 may be implemented by a serving UE and / or a served UE, which may be examples of the corresponding devices described herein. In some aspects, the serving UE and the served UE may be performing wireless communication on a sidelink channel, wherein the serving UE acts as a scheduling entity for sidelink communication.

[0112] As discussed herein, aspects of the described technology provide a serving UE that transmits or otherwise communicates a first configuration signal (e.g., RRC configuration / reconfiguration signal, DCI, etc.) configuring the serving UE to have a first transmit beam resource and a second transmit beam resource. The serving UE can use the first and second transmit beam resources to perform beam management on a sidelink channel. In the example illustrated in beam management configuration 300, the first transmit beam resource corresponds to a first CSI-RS resource set transmitted from the serving UE using the P2 beam, and the second transmit beam resource corresponds to a second CSI-RS resource set transmitted from the serving UE using the P3 beam. The serving UE can determine or otherwise identify a mode for performing beam management using the first and second transmit beam resources. The mode illustrated in beam management configuration 300 is ababab, where "a" represents CSI-RS transmission using the P2 beam, and "b" represents CSI-RS transmission using the P3 beam. The UE served can perform beam management according to this mode and (in some respects) based on the first transmit beam resources and the second transmit beam resources.

[0113] In some aspects, this may include the serving UE sweeping CSI-RS transmissions on each P2 beam 305 in a first CSI-RS resource set (e.g., a first transmit beam resource) for each received beam of a served UE. Concurrently or concurrently, the serving UE may transmit CSI-RS on a P3 beam 310 in a second CSI-RS resource set (e.g., a second transmit beam resource), and the served UE sweeps its received beam. The served UE may transmit a feedback message 315 based on CSI-RS transmissions on P2 and / or P3 beams. This process may be repeated again by the serving UE sweeping CSI-RS transmissions on each P2 beam 320 in a first CSI-RS resource set (e.g., a first transmit beam resource) for each received beam of a served UE. Concurrently or concurrently, the serving UE may transmit CSI-RS on a P3 beam 325 in a second CSI-RS resource set (e.g., a second transmit beam resource), and the served UE sweeps its received beam. The served UE can transmit feedback message 330 based on CSI-RS transmissions on P2 and / or P3 beams. This process can be repeated by the serving UE sweeping CSI-RS transmissions on each P2 beam 335 in the first CSI-RS resource set (e.g., the first transmit beam resource) for each served UE's receive beam. Concurrently or sequentially, the serving UE can transmit CSI-RS on P3 beam 340 in the second CSI-RS resource set (e.g., the second transmit beam resource), and the served UE sweeps its receive beam. The served UE can transmit feedback message 345 based on CSI-RS transmissions on P2 and / or P3 beams.

[0114] The serving UE may identify or otherwise select a new or updated transmit beam resource (e.g., a third transmit beam resource) based on one or more feedback messages received from the served UE. Specifically, each feedback message may identify a candidate P3 beam for the serving UE to use and / or may simply identify the result of the served UE's monitoring of CSI-RS transmissions using P2 and / or P3 beams (e.g., may simply indicate the RSRP value). Accordingly, the serving UE may transmit a second configuration signal (e.g., an RRC configuration / reconfiguration signal) identifying the new transmit beam resource (e.g., an updated CSI-RS resource set using P3 beam 355).

[0115] The process can continue by the serving UE sweeping CSI-RS transmissions on each P2 beam 360 in the first CSI-RS resource set (e.g., the first transmit beam resource) for each served UE's received beam. Concurrently or sequentially, the serving UE may transmit CSI-RS on the P3 beam 365 in the second CSI-RS resource set (e.g., the updated or third transmit beam resource), and the served UE may sweep its received beam. The served UE may transmit a feedback message 370 based on CSI-RS transmissions on the P2 and / or updated P3 beams.

[0116] Figure 4A and Figure 4B Examples of beam management configuration 400 supporting joint transmit and receive beam sweeping for sidelinks, according to various aspects of this disclosure, are described. In some examples, beam management configuration 400 may implement aspects of wireless communication systems 100 and / or 200. The aspects of beam management configuration 400 may be implemented by a serving UE and / or a served UE, which may be examples of the corresponding devices described herein. In some aspects, the serving UE and the served UE may be performing wireless communication on a sidelink channel, wherein the serving UE acts as a scheduling entity for sidelink communication. Generally, beam management configuration 400-a describes a first transmit beam resource mode for beam management, while beam management configuration 400-b describes a second transmit beam resource mode for beam management.

[0117] As discussed herein, aspects of the described technology provide a serving UE that transmits or otherwise communicates a first configuration signal (e.g., an RRC configuration / reconfiguration signal) configuring the serving UE to have a first transmit beam resource and a second transmit beam resource. The serving UE can use the first and second transmit beam resources to perform beam management on a sidelink channel. In the example illustrated in beam management configuration 400, the first transmit beam resource corresponds to a first CSI-RS resource set transmitted from the serving UE using the P2 beam, and the second transmit beam resource corresponds to a second CSI-RS resource set transmitted from the serving UE using the P3 beam. The serving UE can determine or otherwise identify a mode for performing beam management using the first and second transmit beam resources. The serving UE can perform beam management according to this mode and (at least in some aspects) based on the first and second transmit beam resources.

[0118] Specifically, beam management configuration 400 illustrates an example where a first transmit beam resource configured by a first configuration signal corresponds to a CSI-RS resource set transmitted on a first P3 beam (e.g., P3a), and a second transmit beam resource configured by the first configuration signal corresponds to a CSI-RS resource set transmitted on a second P3 beam (e.g., P3b). Accordingly, each P3 beam can cover a corresponding cluster direction between the serving UE and the served UE, where P3a corresponds to the transmit beam in the first cluster direction and P3b corresponds to the transmit beam in the second cluster direction. Broadly speaking, the served UE can sweep the same narrow beam set (e.g., each receive beam) for both P3a and P3b.

[0119] First, referring to beam management configuration 400-a, this may include the serving UE transmitting a first CSI-RS transmission 405 on the P3a beam in a first CSI-RS resource set (e.g., a first transmit beam resource) for each served UE's received beam. Concurrently or sequentially, the serving UE may transmit a second CSI-RS transmission 410 on the P3b beam in a second CSI-RS resource set (e.g., a second transmit beam resource), and the served UE sweeps its received beam. The served UE may transmit a feedback message 415 based on the CSI-RS transmissions on the P3a and / or P3b beams. This process can be repeated by the serving UE transmitting a CSI-RS transmission 420 on the P3a beam in the first CSI-RS resource set (e.g., a first transmit beam resource) for each served UE's received beam. Concurrently or sequentially, the serving UE may transmit a second CSI-RS transmission 425 on the P3b beam in the second CSI-RS resource set (e.g., the second transmit beam resource), and the serving UE may sweep its receive beam. The serving UE may transmit another feedback message 430 based on the CSI-RS transmissions on the P3a and / or P3b beams.

[0120] The serving UE may identify or otherwise select a new or updated transmit beam resource (e.g., a third transmit beam resource) based on one or more feedback messages received from the served UE. Specifically, each feedback message may identify a candidate P3 beam for the serving UE to use and / or may identify the result of the served UE's monitoring of CSI-RS transmissions using P3a and / or P3b beams (e.g., indicating RSRP values). Accordingly, the serving UE may transmit a second configuration signal (e.g., an RRC configuration / reconfiguration signal) identifying the new transmit beam resource (e.g., an updated set of CSI-RS resources using P3a and / or P3b beams 435).

[0121] Thus, Beam Management Configuration 400-a explains an example mode (aa…abb…baa…abb…b…) in which the serving UE transmits CSI-RS data on beam P3a for each served UE receiving beam, and then transmits CSI-RS data on each beam P3b for each served UE receiving beam.

[0122] Next, referring to beam management configuration 400-b, this may include the serving UE transmitting a first CSI-RS transmission and a second CSI-RS transmission on P3a and P3b beams 440 respectively in a first CSI-RS resource set (e.g., a first transmit beam resource) and a second CSI-RS resource set (e.g., a second transmit beam resource) for the first receive beam of the serving UE. The process may continue with the serving UE transmitting the first CSI-RS transmission and the second CSI-RS transmission on P3a and P3b beams 445 respectively in a first CSI-RS resource set (e.g., a first transmit beam resource) and a second CSI-RS resource set (e.g., a second transmit beam resource) for the second receive beam of the serving UE. The process can be repeated for each served UE receiving beam, and the serving UE transmits the first CSI-RS transmission and the second CSI-RS transmission on the P3a beam and P3b beam 450 in the first CSI-RS resource set (e.g., the first transmit beam resource) and the second CSI-RS resource set (e.g., the second transmit beam resource), respectively, for the second received beam of the served UE.

[0123] The served UE can transmit feedback messages 455 based on CSI-RS transmission on the P3a and / or P3b beams.

[0124] The serving UE can identify or otherwise select new or updated transmit beam resources (e.g., a third transmit beam resource) based on one or more feedback messages received from the served UE. That is, each feedback message can identify a candidate P3 beam for the serving UE to use and / or can simply identify the result of the served UE's monitoring of CSI-RS transmissions using P3a and / or P3b beams (e.g., simply indicating the RSRP value). Accordingly, the serving UE can transmit a second configuration signal (e.g., an RRC configuration / reconfiguration signal) identifying the new transmit beam resource (e.g., an updated CSI-RS resource set using P3a and / or P3b beams). This beam management process can be repeated by the serving UE transmitting the first CSI-RS transmission and the second CSI-RS transmission on the P3a and P3b beams 465 in the first CSI-RS resource set (e.g., the first transmit beam resource) and the second CSI-RS resource set (e.g., the second transmit beam resource) respectively for the second receive beam of the served UE.

[0125] Therefore, Beam Management Configuration 400-b explains an example mode (ababab…) in which the serving UE transmits CSI-RS data on the P3a and P3b beams for each served UE.

[0126] In some respects, the reporting overhead of the served UE can be reduced. For example, the served UE may not transmit feedback messages for every instance in the beam management configuration 400. To reduce overhead, the served UE may choose to report (e.g., send feedback messages) based on specific time periods (e.g., periodically), which can cover more than one P3a / P3b procedure (e.g., depending on CSI-RS resources) configuration for serving UE beams P3a and P3b.

[0127] Figure 5 Examples of beam management configuration 500 supporting joint transmit and receive beam sweeping for sidelinks, according to various aspects of this disclosure, are described. In some examples, beam management configuration 500 may implement aspects of wireless communication systems 100 and / or 200. The aspects of beam management configuration 500 may be implemented by a serving UE and / or a served UE, which may be examples of the corresponding devices described herein. In some aspects, the serving UE and the served UE may be performing wireless communication on a sidelink channel, wherein the serving UE acts as a scheduling entity for sidelink communication.

[0128] As discussed herein, aspects of the described technology provide a serving UE that transmits or otherwise communicates a first configuration signal (e.g., an RRC configuration / reconfiguration signal) configuring the serving UE to have a first transmit beam resource and a second transmit beam resource. The serving UE can use the first and second transmit beam resources to perform beam management on a sidelink channel. In the example illustrated in Beam Management Configuration 500, the first transmit beam resource corresponds to a first CSI-RS resource set transmitted from the serving UE using the P2 beam, and the second transmit beam resource corresponds to a second CSI-RS resource set transmitted from the serving UE using the P3 beam. The serving UE can determine or otherwise identify a mode for performing beam management using the first and second transmit beam resources. The serving UE can perform beam management according to this mode and (in some aspects) based on the first and second transmit beam resources.

[0129] Generally, aspects of the described technology may include a first transmit beam resource corresponding to M CSI-RS resource sets for the P2 beam, and a second transmit beam resource corresponding to N CSI-RS resource sets for the P3 beam. In the example explained in beam management configuration 500, the first transmit beam resource corresponds to a first set of CSI-RS resource sets using the P2 beam, and the second transmit beam resource corresponds to a second set of CSI-RS resource sets, wherein the second set of CSI-RS resource sets includes a first subset of CSI-RS resource sets using the P3a beam and a second subset of CSI-RS resource sets using the P3b beam.

[0130] Accordingly, this may include the serving UE sweeping CSI-RS transmissions on each P2 beam 502 in the first CSI-RS resource set (e.g., the first transmit beam resource) for each served UE received beam. The served UE may transmit feedback messages 504 based at least in part on CSI-RS transmissions on the P2 beams.

[0131] Concurrently or concurrently, the serving UE may transmit CSI-RS on beam 506 of the second CSI-RS resource set (e.g., the second transmit beam resource), and the serving UE sweeps its receive beam. Concurrently or concurrently, the serving UE may transmit CSI-RS on beam 508 of the second CSI-RS resource set (e.g., the second transmit beam resource), and the serving UE sweeps its receive beam. The serving UE may transmit feedback message 510 based at least in part on CSI-RS transmissions on beams P3a / P3b.

[0132] The process can continue, with the serving UE sweeping CSI-RS transmissions on each P2 beam 512 in the first CSI-RS resource set (e.g., the first transmit beam resource) for each served UE receive beam. The served UE can transmit feedback messages 514 based at least in part on CSI-RS transmissions on the P2 beams.

[0133] Concurrently or concurrently, the serving UE may transmit CSI-RS on beam 516 of the P3a in the second CSI-RS resource set (e.g., the second transmit beam resource), and the serving UE sweeps its receive beam. Concurrently or concurrently, the serving UE may transmit CSI-RS on beam 518 of the P3b in the second CSI-RS resource set (e.g., the second transmit beam resource), and the serving UE sweeps its receive beam. The serving UE may transmit feedback messages 520 based at least in part on CSI-RS transmissions on the P3a / P3b beams. Based on at least one of these feedback messages, the serving UE may configure itself to have a new or updated transmit beam resource 522 (e.g., a third transmit beam resource). For example, the new or updated transmit beam resource may identify a new CSI-RS resource set using the new or updated P2, P3a, and / or P3b beams.

[0134] The process can continue again, with the serving UE sweeping CSI-RS transmissions on each P2 beam 524 in the first CSI-RS resource set (e.g., the first transmit beam resource) for each served UE received beam. The served UE can transmit feedback messages 526 based at least in part on CSI-RS transmissions on the P2 beams. Based on at least one of these feedback messages, the serving UE can configure the served UE to have new or updated transmit beam resources 528 (e.g., the third transmit beam resource). For example, the new or updated transmit beam resources can identify a new CSI-RS resource set using the new or updated P2 beam, P3a beam, and / or P3b beam.

[0135] Concurrently or concurrently, the serving UE may transmit CSI-RS on beam 534 of the second CSI-RS resource set (e.g., the second transmit beam resource), and the serving UE sweeps its receive beam. Concurrently or concurrently, the serving UE may transmit CSI-RS on beam 536 of the second CSI-RS resource set (e.g., the second transmit beam resource), and the serving UE sweeps its receive beam. The serving UE may transmit feedback message 538 based at least in part on CSI-RS transmissions on beams P3a / P3b.

[0136] The process can continue further, with the serving UE sweeping CSI-RS transmissions on each P2 beam 530 in the first CSI-RS resource set (e.g., the first transmit beam resource) for each served UE received beam. The served UE can transmit feedback messages 532 based at least in part on CSI-RS transmissions on the P2 beams.

[0137] Accordingly, the served UE may use the first receive beam to monitor reference signal transmissions from the serving UE (e.g., CSI-RS transmissions using the P2 beam), and sweep the receive beam set to monitor one or more instances of the second reference signal transmissions (e.g., CSI-RS transmissions using the P3a and / or P3b beams).

[0138] Figure 6Examples of a process 600 supporting joint transmit and receive beam sweeping for a sidelink, according to various aspects of this disclosure, are described. In some examples, process 600 may implement aspects of wireless communication systems 100 and / or 200, and / or beam management configurations 300 and / or 400. The aspects of process 600 may be implemented by a serving UE 605 and a served UE 610, which may be examples of the corresponding devices described herein. In some aspects, the serving UE 605 and the served UE 610 may be performing wireless communication on a sidelink channel. In some aspects, with respect to wireless communication on a sidelink channel, the serving UE 605 acts as a scheduling entity for the served UE 610.

[0139] It should be understood that references to specific wireless devices (e.g., UEs) in process 600 are provided for illustrative purposes, and different wireless devices not specifically mentioned herein may be used interchangeably with those described herein. For example, the operations described as being performed by serving UE 605 may, in some cases, be performed by a base station, control UE, primary UE, anchor UE, or any sidelink scheduling node. Furthermore, while the operations performed in process 600 are described using sidelink communication, it should be understood that the techniques described herein can be used for any type of wireless communication (e.g., on any type of wireless link).

[0140] At 615, the serving UE 605 may transmit a first configuration signal on a channel (e.g., a sidelink channel, a downlink channel, etc.) (and the served UE 610 may receive this first configuration signal), which configures the served UE 610 to have a first transmit beam resource and a second transmit beam resource of the serving UE 605. The configuration signal may include an RRC signal, a DCI signal, a MAC control element (CE), etc. In some examples, the base station may configure the serving UE 605, which in turn may configure the served UE 610. In some other examples, the served UE 610 may receive the first configuration signal from the base station (e.g., not the serving UE 605) on a downlink channel, for example, and may receive one or more sidelink reference signals from the serving UE 605.

[0141] In some aspects, a first transmit beam resource may correspond to a first CSI-RS resource set, and a second transmit beam resource may correspond to a second CSI-RS resource set. In other aspects, a first transmit beam resource may correspond to a first subset of a CSI-RS resource set, and a second transmit beam resource may correspond to a second subset of that CSI-RS resource set. Generally, a first transmit beam resource may correspond to M CSI-RS resource sets, and a second transmit beam resource may correspond to N CSI-RS resource sets, where M and N may be the same integer or may be different. In some examples, a first transmit beam resource may include a first repeated transmission using the same first antenna port, and a second transmit beam resource may include a second repeated transmission using the same second antenna port, or both.

[0142] At 620, the served UE 610 can identify a mode for performing beam management on the sidelink channel using a first transmit beam resource and a second transmit beam resource based on a first configuration signal. This mode can be based on a repeating flag for the first and / or second transmit beam resources configured by the first configuration signal.

[0143] In 625, the served UE 610 can perform beam management on the sidelink channel according to this mode and using the first transmit beam resources and the second transmit beam resources. For example, the serving UE 605 can transmit (various) CSI-RS on the sidelink channel according to the first transmit beam resources and the second transmit beam resources.

[0144] In some aspects, this may include the served UE 610 using a first receive beam to monitor reference signal transmissions (e.g., CSI-RS transmissions on the P2 beam) based on a first transmit beam resource, and using a set of receive beams to monitor reference signal transmissions (e.g., CSI-RS transmissions on the P3 beam) based on a second transmit beam resource. In some cases, the served UE 610 may monitor (e.g., from the serving UE 615) a first reference signal transmission based on the first transmit beam resource, including a first repeated transmission using the same first antenna port. Additionally or alternatively, the served UE 610 may monitor (e.g., from the serving UE 615) a second reference signal transmission based on the second transmit beam resource, including a second repeated transmission using the same second antenna port.

[0145] In some aspects, this may include the served UE 610 sweeping the received beam set to monitor (e.g., from the serving UE 615) a first reference signal transmission based on a first transmit beam resource (e.g., sweeping each received beam of the served UE 610 to detect CSI-RS transmission on the P3a beam), and sweeping the received beam set to monitor (e.g., from the serving UE 615) a second reference signal transmission based on a second transmit beam resource (e.g., sweeping each received beam of the served UE 610 to detect CSI-RS transmission on the P3b beam).

[0146] In some aspects, this may include the served UE 610 using a first receive beam to monitor reference signal transmissions (e.g., CSI-RS transmissions on the P2 beam) according to a first transmit beam resource, and sweeping the receive beam set to monitor second reference signal transmissions (e.g., CSI-RS transmissions on the P3a and P3b beams) according to a second transmit beam resource. In some examples, the served UE 610 may perform beam sweeping on repeated transmissions included in the first transmit beam resource and / or on repeated transmissions included in the second transmit beam resource. In some cases, the served UE 610 may perform monitoring of reference signal transmissions using the first receive beam according to the first transmit beam resource concurrently, coherently, or using time-division multiplexing with the monitoring of reference signal transmissions performed by sweeping the received beam set of the served UE 610. In some other cases, the served UE 610 may concurrently, coherently, or using time-division multiplexing perform monitoring of the transmission of the first reference signal by sweeping the received beam set of the served UE 610, in conjunction with monitoring of the transmission of the second reference signal by sweeping the received beam set.

[0147] At 630, the served UE 610 may transmit a feedback message. In some examples, the served UE 610 may transmit a feedback message to the serving UE 605. In some other examples, for instance, if the served UE 610 is configured by a base station, a control sidelink UE, or another sidelink scheduling node, the served UE 610 may transmit a feedback message to that base station, control sidelink UE, or other sidelink scheduling node. In still other examples, the served UE 610 may transmit a feedback message to the base station, and the base station may transmit the feedback message to the serving UE 605. Additionally or alternatively, the base station may instruct the serving UE 605 based on the feedback message.

[0148] In some aspects, the feedback message may be based on CSI-RS transmissions from the serving UE 605 using the first and second transmit beam resources. That is, the feedback message may be transmitted in response to the serving UE 610 monitoring one or more CSI-RS transmissions on the first and / or second transmit beam resources discussed above. In some aspects, the feedback message may identify the results of the monitoring by the serving UE 610 (e.g., RSRP) and / or may identify that the serving UE 610 has identified it as a candidate beam suitable for performing wireless communication on a channel (e.g., a sidelink channel or a downlink channel) (e.g., a candidate beam that can be selected as an active beam for such communication).

[0149] In some aspects, the serving UE 605 (e.g., or the base station) may identify an updated or new beam (e.g., a third transmit beam resource) to be used for communication on the channel and configure the served UE 610 to have that new transmit beam. For example, the serving UE 605 (e.g., or the base station) may transmit a second configuration signal (e.g., an RRC signal, DCI, etc.) identifying the third transmit beam resource to be used for wireless communication on the channel.

[0150] Figure 7 A block diagram 700 of an apparatus 705 supporting joint transmit and receive beamsweeping for a sidelink, according to various aspects of this disclosure, is shown. Apparatus 705 may be an example of various aspects of a UE 115 or base station 105 as described herein. Apparatus 705 may include a receiver 710, a communication manager 715, and a transmitter 720. Apparatus 705 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0151] Receiver 710 can 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 joint transmit and receive beam sweeps for sidelinks). This information can be passed to other components of device 705. Receiver 710 can be a reference... Figure 10 Examples of various aspects of the transceiver 1020 described. The receiver 710 may utilize a single antenna or an array of antennas.

[0152] When device 705 is configured as a served UE, communication manager 715 may: receive a first configuration signal on a channel (e.g., a sidelink channel, a downlink channel) from a wireless device (e.g., a serving UE, a base station, etc.), the first configuration signal configuring the served UE to have a first transmit beam resource and a second transmit beam resource for the served UE to perform beam management on the sidelink channel; identify a mode for performing beam management using the first transmit beam resource and the second transmit beam resource based on the first configuration signal; and perform beam management on the sidelink channel using the first transmit beam resource and the second transmit beam resource according to the mode.

[0153] When device 705 is configured to serve a wireless device (e.g., a UE, a base station, etc.), communication manager 715 may also: (e.g., transmit a first configuration signal to the served UE on a channel (such as a sidelink channel or a downlink channel), the first configuration signal configuring the served UE to have a first transmit beam resource and a second transmit beam resource for the served UE to use for beam management on the sidelink channel; use the first transmit beam resource to transmit one or more first reference signals and use the second transmit beam resource to transmit one or more second reference signals; and receive feedback messages based on the transmission of the one or more first reference signals, the one or more second reference signals, or both (e.g., from the served UE). Communication manager 715 may be an example of aspects of communication manager 1010 described herein.

[0154] The communication manager 715 or its sub-components may be implemented in hardware, code executed by a processor (e.g., software or firmware), or any combination thereof. If implemented in code executed by a processor, the functionality of the communication manager 715 or its sub-components may be performed by a general-purpose processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), 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 this disclosure.

[0155] The communication manager 715 or its subcomponents may be physically located at various locations, including being distributed such that portions of the functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of this disclosure, the communication manager 715 or its subcomponents may be separate and distinct components. In some examples, according to various aspects of this disclosure, the communication manager 715 or its subcomponents may be combined with one or more other hardware components, including but not limited to input / output (I / O) components, transceivers, network servers, another computing device, one or more other components described in this disclosure, or combinations thereof.

[0156] Transmitter 720 can transmit signals generated by other components of device 705. In some examples, transmitter 720 may coexist with receiver 710 in a transceiver module. For example, transmitter 720 may be a reference... Figure 10 Examples of various aspects of the transceiver 1020 described. The transmitter 720 may utilize a single antenna or an array of antennas.

[0157] By including or configuring a communication manager 720 according to the examples described herein, device 705 (e.g., a processor that controls or otherwise couples to receiver 710, transmitter 715, communication manager 720, or a combination thereof) can support improved beam management techniques for sidelink communication. For example, by enabling the served UE to determine the appropriate beam management pattern, the served UE can avoid performing iterative beam management processes with the serving UE or base station and can more efficiently determine the optimal available transmit beam and the optimal available receive beam. Determining the optimal beam can provide more reliable and robust communication to the served UE and the serving UE or base station, thereby reducing network overhead and improving efficiency. Furthermore, implementing the joint beam sweep procedure described herein can reduce the frequency at which the UE's processor must ramp up to handle signal transmission or retransmission and reception, thereby reducing processing resources at the UE, reducing power consumption, and improving battery performance.

[0158] Figure 8 A block diagram 800 of an apparatus 805 supporting joint transmit and receive beamsweeping for a sidelink, according to various aspects of this disclosure, is shown. Apparatus 805 may be an example of aspects of apparatus 705, base station 105, or UE 115 as described herein. Apparatus 805 may include a receiver 810, a communication manager 815, and a transmitter 840. Apparatus 805 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0159] Receiver 810 can 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 joint transmit and receive beam sweeps for sidelinks). This information can be passed to other components of device 805. Receiver 810 can be a reference... Figure 10 Examples of various aspects of the transceiver 1020 described. The receiver 810 may utilize a single antenna or an array of antennas.

[0160] Communication manager 815 may be an example of aspects of communication manager 715 as described herein. Communication manager 815 may include configuration signal manager 820, mode manager 825, beam management manager 830, and feedback manager 835. Communication manager 815 may be an example of aspects of communication manager 1010 as described herein.

[0161] The configuration signal manager 820 may (e.g., from the serving UE on a sidelink channel, from the base station on a downlink channel, etc.) receive a first configuration signal that configures the serving UE to have a first transmit beam resource and a second transmit beam resource for the serving UE to use for beam management on the sidelink channel.

[0162] The mode manager 825 can identify the mode for performing beam management using the first transmit beam resources and the second transmit beam resources based on the first configuration signal.

[0163] The beam management manager 830 can perform beam management on the sidelink channel using the first transmit beam resources and the second transmit beam resources according to this mode.

[0164] The configuration signal manager 820 can transmit a first configuration signal that configures the served UE to have a first transmit beam resource and a second transmit beam resource for the served UE to use for beam management on the side link channel.

[0165] The beam management manager 830 can use a first transmit beam resource to transmit one or more first reference signals, and use a second transmit beam resource to transmit one or more second reference signals.

[0166] The feedback manager 835 can receive feedback messages based on the transmission of one or more first reference signals, one or more second reference signals, or both.

[0167] Transmitter 840 can transmit signals generated by other components of device 805. In some examples, transmitter 840 may coexist with receiver 810 in a transceiver module. For example, transmitter 840 may be a reference... Figure 10 Examples of various aspects of the transceiver 1020 described. The transmitter 840 may utilize a single antenna or an array of antennas.

[0168] Figure 9A block diagram 900 is shown of a communication manager 905 supporting joint transmit and receive beam sweeping for sidelinks according to various aspects of this disclosure. The communication manager 905 may be an example of aspects of the communication manager 715, communication manager 815, or communication manager 1010 described herein. The communication manager 905 may include a configuration signal manager 910, a mode manager 915, a beam management manager 920, a P2 / P3 beam manager 925, a reselection manager 930, a P3a / P3b beam manager 935, a P2 / P3a / P3b beam manager 940, and a feedback manager 945. Each of these modules may communicate directly or indirectly with each other (e.g., via one or more buses).

[0169] The configuration signal manager 910 may receive a first configuration signal (e.g., from the serving UE, base station, etc.) that configures the serving UE to have (e.g., the serving UE's) first transmit beam resources and second transmit beam resources for the serving UE to use for beam management on the sidelink channel.

[0170] In some examples, the configuration signal manager 910 may (e.g., to the served UE on a sidelink channel) transmit a first configuration signal that configures the served UE to have (e.g., the serving UE's) first transmit beam resources and second transmit beam resources for the served UE to use for beam management on the sidelink channel.

[0171] In some cases, the first configuration signal configures the first transmit beam resource as a first reference signal resource set and a second reference signal resource set, and configures the second transmit beam resource as a third reference signal resource set, wherein the second and third reference signal resource sets are configured with repetition enabled for beam management. In some cases, the first transmit beam resource includes a first CSI-RS resource set, and the second transmit beam resource includes a second CSI-RS resource set. In some cases, the first transmit beam resource includes a first subset of the CSI-RS resource set, and the second transmit beam resource includes a second subset of that CSI-RS resource set. In some cases, the first transmit beam resource includes a first CSI-RS resource set, and the second transmit beam resource includes a second CSI-RS resource set. In some cases, the first transmit beam resource includes a first subset of the CSI-RS resource set, and the second transmit beam resource includes a second subset of that CSI-RS resource set. In some examples, the second transmit beam resource includes repeated transmissions using the same antenna port.

[0172] The mode manager 915 can identify the mode for performing beam management using the first transmit beam resources and the second transmit beam resources based on the first configuration signal.

[0173] The beam management manager 920 can perform beam management on the sidelink channel using the first transmit beam resources and the second transmit beam resources according to this mode.

[0174] In some examples, the beam management manager 920 may use a first transmit beam resource to transmit one or more first reference signals and a second transmit beam resource to transmit one or more second reference signals. In some cases, the transmission of the one or more first reference signals and the one or more second reference signals is performed concurrently, sequentially, or using time-division multiplexing. In some cases, the transmission of the one or more first reference signals and the one or more second reference signals is performed between successive symbols, or successive mini-slots, or successive slots, or successive subframes, or combinations thereof.

[0175] The feedback manager 945 can receive feedback messages based on the transmission of one or more first reference signals, one or more second reference signals, or both (e.g., from a served UE). In some examples, the feedback manager 945 can receive a first feedback message based on the one or more first reference signals. In some examples, the feedback manager 945 can receive a second feedback message based on the one or more second reference signals.

[0176] The P2 / P3 beam manager 925 can monitor reference signal transmissions (e.g., from the serving UE, from a base station, etc.) based on a first transmit beam resource using a first receive beam of the served UE. In some examples, the P2 / P3 beam manager 925 can monitor reference signal transmissions (e.g., from the serving UE) based on a second transmit beam resource by sweeping the receive beam set of the served UE. In some examples, the P2 / P3 beam manager 925 can monitor reference signal transmissions based on the second transmit beam resource, including repeated transmissions using the same antenna port. In some examples, the P2 / P3 beam manager 925 can use the first receive beam for monitoring and monitor concurrently, coherently, or using time-division multiplexing by sweeping the receive beam set.

[0177] In some examples, the P2 / P3 beam manager 925 can alternate between monitoring using a first receive beam and monitoring via a swept receive beam set, between successive symbols, or successive mini-slots, or successive slots, or successive subframes, or combinations thereof. In some examples, the P2 / P3 beam manager 925 can transmit a first feedback message identifying the result of monitoring using the first receive beam. In some examples, the P2 / P3 beam manager 925 can transmit a second feedback message identifying the result of monitoring via a swept receive beam set.

[0178] The reselection manager 930 can identify one or more transmit beam candidates based on monitoring reference signal transmissions (e.g., from the serving UE, from a base station, etc.) using a first receive beam of the served UE. In some examples, the reselection manager 930 can transmit a feedback message identifying the one or more transmit beam candidates. In some examples, the reselection manager 930 can reset a second transmit beam resource based on the feedback message. In some examples, the reselection manager 930 can select at least one third transmit beam resource based on the feedback message. In some examples, the reselection manager 930 can transmit a second configuration signal to the served UE, which identifies the third transmit beam resource as an alternative to the first or second transmit beam resource.

[0179] The P3a / P3b beam manager 935 can monitor (e.g., from the serving UE) a first reference signal transmission by sweeping the received beam set of the served UE based on a first transmit beam resource (e.g., based on the first transmit beam resource including a first repeated transmission using the same first antenna port). In some examples, the P3a / P3b beam manager 935 can monitor (e.g., from the serving UE) a second reference signal transmission by sweeping the received beam set of the served UE based on a second transmit beam resource (e.g., based on the second transmit beam resource including a second repeated transmission using the same second antenna port). In some examples, the P3a / P3b beam manager 935 can monitor the first reference signal transmission and monitor the second reference signal transmission concurrently, coherently, or using time-division multiplexing. In some examples, the P3a / P3b beam manager 935 can alternate between monitoring the first reference signal transmission and monitoring the second reference signal transmission between successive symbols, or successive mini-slots, or successive slots, or successive subframes, or combinations thereof. In some examples, the P3a / P3b beam manager 935 can transmit a first feedback message identifying the result of monitoring the transmission of the first reference signal. In some examples, the P3a / P3b beam manager 935 can transmit a second feedback message identifying the result of monitoring the transmission of the second reference signal.

[0180] The P2 / P3a / P3b beam manager 940 can monitor (e.g., from the serving UE) reference signal transmissions using a first receive beam of the served UE based on a first transmit beam resource. In some examples, the P2 / P3a / P3b beam manager 940 can monitor multiple instances of second reference signal transmissions (e.g., from the serving UE) by sweeping the received beam set of the served UE based on a second transmit beam resource (e.g., including repeated transmissions using the same antenna port). In some examples, the P2 / P3a / P3b beam manager 940 can monitor reference signal transmissions concurrently, coherently, or using time-division multiplexing to monitor multiple instances of second reference signal transmissions. In some examples, the P2 / P3a / P3b beam manager 940 can alternate between monitoring reference signal transmissions and monitoring multiple instances of second reference signal transmissions between successive symbols, or successive mini-slots, or successive slots, or successive subframes, or combinations thereof. In some examples, the P2 / P3a / P3b beam manager 940 may transmit a first feedback message identifying the result of monitoring the transmission of the reference signal. In some examples, the P2 / P3a / P3b beam manager 940 may transmit a second feedback message identifying the result of monitoring multiple instances of the transmission of the second reference signal. In some examples, the P2 / P3a / P3b beam manager 940 may reset the second transmit beam resource based on at least one of the first feedback message, the second feedback message, or a combination thereof.

[0181] In some cases, the first transmit beam resource corresponds to a first set of reference signal resources. In other cases, the second transmit beam resource corresponds to a second set of reference signal resources.

[0182] Figure 10 A diagram of a system 1000 including device 1005 supporting joint transmit and receive beamsweeping for sidelinks, according to various aspects of this disclosure, is shown. Device 1005 may be an example of device 705, device 805, base station 105, or UE 115 as described herein, or may include components thereof. Device 1005 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, including a communication manager 1010, an I / O controller 1015, a transceiver 1020, an antenna 1025, a memory 1030, and a processor 1040. These components may be in electronic communication via one or more buses (e.g., bus 1045).

[0183] When device 1005 is configured as a served UE, communication manager 1010 may: (e.g., from the serving UE on a sidelink channel, from a base station on a downlink channel, etc.) receive a first configuration signal that configures the served UE to have (e.g., the serving UE's) first transmit beam resources and second transmit beam resources for the served UE to use for beam management on the sidelink channel; identify a mode for performing beam management using the first transmit beam resources and second transmit beam resources based on the first configuration signal; and use the first transmit beam resources and second transmit beam resources according to the mode to perform beam management on the sidelink channel.

[0184] When device 1005 is configured to serve a UE (e.g., or a base station), communication manager 1010 may also: (e.g., to the served UE on a sidelink channel, to the served UE on a downlink channel, etc.) transmit a first configuration signal that configures the served UE to have (e.g., the served UE's) first transmit beam resources and second transmit beam resources for the served UE to use for beam management on the sidelink channel; use the first transmit beam resources to transmit one or more first reference signals and use the second transmit beam resources to transmit one or more second reference signals; and receive feedback messages based on the transmission of the one or more first reference signals, the one or more second reference signals, or both (e.g., from the served UE, from the served UE, etc.).

[0185] By including or configuring a communication manager 1010 according to the example described herein, device 1005 can support improved beam management techniques for sidelink communication. For example, by enabling the use of joint beam sweeping in sidelink transmissions, the number of sidelink transmissions and retransmissions for beam management can be reduced, thereby reducing network overhead, increasing coverage area, and improving efficiency. Furthermore, by performing joint beam sweeping in sidelink transmissions, aspects of this disclosure provide more reliable beam management at the mobile UE, thereby improving the robustness and reliability of communication between mobile UEs.

[0186] I / O controller 1015 manages the input and output signals of device 1005. I / O controller 1015 can also manage peripheral devices not integrated into device 1005. In some cases, I / O controller 1015 may represent a physical connection or port to an external peripheral device. In some cases, I / O controller 1015 may utilize an operating system, such as... Or another known operating system. In other cases, the I / O controller 1015 may represent or interact with a modem, keyboard, mouse, touchscreen, or similar device. In some cases, the I / O controller 1015 may be implemented as part of a processor. In some cases, a user may interact with the device 1005 via the I / O controller 1015 or via hardware components controlled by the I / O controller 1015.

[0187] Transceiver 1020 can communicate bidirectionally via one or more antennas, wired or wireless links, as described above. For example, transceiver 1020 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. Transceiver 1020 may also include a modem to modulate packets and provide the modulated packets to the antenna for transmission, and to demodulate packets received from the antenna.

[0188] In some cases, the wireless device may include a single antenna 1025. However, in other cases, the device may have more than one antenna 1025, which may be able to transmit or receive multiple wireless transmissions concurrently.

[0189] Memory 1030 may include RAM and ROM. Memory 1030 may store computer-readable, computer-executable code 1035, including instructions that, when executed, cause the processor to perform the various functions described herein. In some cases, memory 1030 may particularly include a BIOS that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0190] Processor 1040 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, processor 1040 may be configured to use a memory controller to operate a memory array. In other cases, the memory controller may be integrated into processor 1040. Processor 1040 may be configured to execute computer-readable instructions stored in memory (e.g., memory 1030) to cause device 1005 to perform various functions (e.g., supporting functions or tasks for joint transmit and receive beamsweeping for sidelinks).

[0191] Code 1035 may include instructions for implementing various aspects of this disclosure, including instructions for supporting wireless communication. Code 1035 may be stored in a non-transient computer-readable medium, such as system memory or other types of memory. In some cases, code 1035 may not be directly executed by processor 1040, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0192] Figure 11 A flowchart illustrating a method 1100 for joint transmit and receive beam sweeping for a sidelink, according to various aspects of this disclosure, is shown. Operation of method 1100 can be implemented by a UE 115 or its components as described herein. For example, operation of method 1100 can be performed by, as referenced... Figures 7 to 10 The described communication manager is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the following functions. Alternatively or alternatively, the UE can use dedicated hardware to perform aspects of the following functions.

[0193] At 1105, the UE may (e.g., from the serving UE on a sidelink channel, from the base station on a downlink channel, etc.) receive a first configuration signal that configures the serving UE to have (e.g., the serving UE's) first and second transmit beam resources for the serving UE to use for beam management on the sidelink channel. Operation of 1105 may be performed according to the methods described herein. In some examples, aspects of the operation of 1105 may be determined by reference to... Figures 7 to 10 The described configuration signal manager is used to execute this.

[0194] In 1110, the UE can identify the mode for performing beam management using the first transmit beam resources and the second transmit beam resources based on a first configuration signal. The operation of 1110 can be performed according to the methods described herein. In some examples, aspects of the operation of 1110 can be determined by reference to... Figures 7 to 10 The described pattern manager is used to execute this.

[0195] In 1115, the UE can perform beam management on the sidelink channel using the first and second transmit beam resources according to this mode. The operation of 1115 can be performed according to the methods described herein. In some examples, aspects of the operation of 1115 can be determined by referring to... Figures 7 to 10 The described beam management manager is used to perform this.

[0196] Figure 12 A flowchart illustrating a method 1200 for joint transmit and receive beam sweeping for a sidelink, according to various aspects of this disclosure, is shown. Operation of method 1200 can be implemented by a UE 115 or its components as described herein, or by a base station 105 or its components. For example, operation of method 1200 can be implemented by, as described in reference... Figures 7 to 10 The described communication manager is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the following functions. Alternatively or alternatively, the UE can use dedicated hardware to perform aspects of the following functions.

[0197] At 1205, the UE may (e.g., from the serving UE on a sidelink channel, from the base station on a downlink channel, etc.) receive a first configuration signal that configures the serving UE to have a first transmit beam resource and a second transmit beam resource for the serving UE to use for beam management on the sidelink channel. Operation of 1205 may be performed according to the methods described herein. In some examples, aspects of the operation of 1205 may be determined by reference to... Figures 7 to 10 The described configuration signal manager is used to execute this.

[0198] In 1210, the UE can identify a mode for performing beam management using a first transmit beam resource and a second transmit beam resource based on a first configuration signal. The operation of 1210 can be performed according to the methods described herein. In some examples, aspects of the operation of 1210 can be determined by reference to [reference needed]. Figures 7 to 10 The described pattern manager is used to execute this.

[0199] In 1215, the UE can perform beam management on the sidelink channel using the first and second transmit beam resources according to this mode. The operation of 1215 can be performed according to the methods described herein. In some examples, aspects of the operation of 1215 can be determined by referring to... Figures 7 to 10 The described beam management manager is used to perform this.

[0200] At 1220, the UE can use the first receive beam of the served UE based on the first transmit beam resource to monitor reference signal transmissions from the serving UE. The operation of 1220 can be performed according to the method described herein. In some examples, aspects of the operation of 1220 can be determined by reference to... Figures 7 to 10 The described P2 / P3 beam manager is used to perform this.

[0201] In step 1225, the UE can monitor reference signal transmissions from the serving UE by sweeping the received beam set of the served UE based on the second transmit beam resources. Operation of step 1225 can be performed according to the methods described herein. In some examples, aspects of the operation of step 1225 can be determined by reference to... Figures 7 to 10 The described P2 / P3 beam manager is used to perform this.

[0202] Figure 13 A flowchart illustrating a method 1300 for joint transmit and receive beam sweeping for a sidelink, according to various aspects of this disclosure, is shown. Operation of method 1300 can be implemented by a UE 115 or its components as described herein. For example, operation of method 1300 can be performed by, as referenced... Figures 7 to 10The described communication manager is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the following functions. Alternatively or alternatively, the UE can use dedicated hardware to perform aspects of the following functions.

[0203] At 1305, the UE may receive a first configuration signal from the serving UE on the sidelink channel. This first configuration signal configures the serving UE to have a first transmit beam resource and a second transmit beam resource for the serving UE to use for beam management on the sidelink channel. Operation of 1305 may be performed according to the methods described herein. In some examples, aspects of the operation of 1305 may be determined by reference to [reference needed]. Figures 7 to 10 The described configuration signal manager is used to execute this.

[0204] In 1310, the UE can identify a mode for performing beam management using a first transmit beam resource and a second transmit beam resource based on a first configuration signal. Operation of 1310 can be performed according to the methods described herein. In some examples, aspects of the operation of 1310 can be determined by reference to... Figures 7 to 10 The described pattern manager is used to execute this.

[0205] In 1315, the UE can perform beam management on the sidelink channel using the first and second transmit beam resources according to this mode. The operation of 1315 can be performed according to the methods described herein. In some examples, aspects of the operation of 1315 can be determined by referring to... Figures 7 to 10 The described beam management manager is used to perform this.

[0206] At 1320, the UE can identify one or more transmit beam candidates based on monitoring reference signal transmissions from the serving UE using a first received beam. Operation of 1320 can be performed according to the methods described herein. In some examples, aspects of operation of 1320 can be determined by reference to... Figures 7 to 10 The described reselection manager is used to execute this.

[0207] At 1325, the UE may transmit a feedback message identifying the one or more transmit beam candidates. Operation of 1325 may be performed according to the methods described herein. In some examples, aspects of operation of 1325 may be determined by reference to... Figures 7 to 10 The described reselection manager is used to execute this.

[0208] At 1330, the UE can reset the second transmit beam resource based on the feedback message. The operation of 1330 can be performed according to the method described herein. In some examples, aspects of the operation of 1330 can be determined by referring to... Figures 7 to 10 The described reselection manager is used to execute this.

[0209] Figure 14 A flowchart illustrating a method 1400 for joint transmit and receive beam sweeping for a sidelink, according to various aspects of this disclosure, is shown. Operation of method 1400 can be implemented by a UE 115 or its components as described herein. For example, operation of method 1400 can be performed by, as referenced... Figures 7 to 10 The described communication manager is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the following functions. Alternatively or alternatively, the UE can use dedicated hardware to perform aspects of the following functions.

[0210] At 1405, the UE may transmit a first configuration signal to the served UE on the sidelink channel. This first configuration signal configures the served UE to have a first transmit beam resource and a second transmit beam resource for the served UE to use for beam management on the sidelink channel. Operation of 1405 may be performed according to the methods described herein. In some examples, aspects of operation of 1405 may be determined by reference to [reference needed]. Figures 7 to 10 The described configuration signal manager is used to execute this.

[0211] At 1410, the UE may use a first transmit beam resource to transmit one or more first reference signals and a second transmit beam resource to transmit one or more second reference signals. The operation of 1410 may be performed according to the methods described herein. In some examples, aspects of the operation of 1410 may be determined by reference to... Figures 7 to 10 The described beam management manager is used to perform this.

[0212] At 1415, the UE can receive feedback messages from the served UE based on the transmission of one or more first reference signals, one or more second reference signals, or both. The operation of 1415 can be performed according to the methods described herein. In some examples, aspects of the operation of 1415 can be determined by reference to... Figures 7 to 10 The described feedback manager is used to execute this.

[0213] Figure 15 A flowchart illustrating a method 1500 for joint transmit and receive beam sweeping for a sidelink, according to various aspects of this disclosure, is shown. Operation of method 1500 can be implemented by a UE 115 or its components as described herein, or by a base station 105 or its components. For example, operation of method 1500 can be implemented by, as referenced... Figures 7 to 10 The described communication manager is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the following functions. Alternatively or alternatively, the UE can use dedicated hardware to perform aspects of the following functions.

[0214] At 1505, the UE may (e.g., to the serving UE on a sidelink channel, to the serving UE on a downlink channel, etc.) transmit a first configuration signal that configures the serving UE to have (e.g., the serving UE's) first and second transmit beam resources for the serving UE to use for beam management on the sidelink channel. Operation of 1505 may be performed according to the methods described herein. In some examples, aspects of the operation of 1505 may be determined by reference to [reference needed]. Figures 7 to 10 The described configuration signal manager is used to execute this.

[0215] In step 1510, the UE may use a first transmit beam resource to transmit one or more first reference signals and a second transmit beam resource to transmit one or more second reference signals. The operation of step 1510 may be performed according to the methods described herein. In some examples, aspects of the operation of step 1510 may be determined by reference to... Figures 7 to 10 The described beam management manager is used to perform this.

[0216] At 1515, the UE can receive feedback messages based on the transmission of one or more first reference signals, one or more second reference signals, or both (e.g., from the served UE). Operation of 1515 can be performed according to the methods described herein. In some examples, aspects of operation of 1515 can be determined by reference to... Figures 7 to 10 The described feedback manager is used to execute this.

[0217] At 1520, the UE can select at least one third transmit beam resource based on feedback messages. The operation of 1520 can be performed according to the methods described herein. In some examples, aspects of the operation of 1520 can be determined by referring to... Figures 7 to 10 The described reselection manager is used to execute this.

[0218] At 1525, the UE may transmit a second configuration signal to the served UE, which identifies the third transmit beam resource as an alternative to the first transmit beam resource or the second transmit beam resource. Operation of 1525 may be performed according to the methods described herein. In some examples, aspects of the operation of 1525 may be determined by reference to... Figures 7 to 10 The described reselection manager is used to execute this.

[0219] It should be noted that the methods described in this paper describe possible implementations, and the operations and steps can be rearranged or otherwise modified, and other implementations are also possible. Furthermore, aspects from two or more methods can be combined.

[0220] The following provides an overview of the various aspects of this disclosure:

[0221] Aspect 1: A method for performing wireless communication at a served UE, comprising: receiving a first configuration signal configuring the served UE to have a first transmit beam resource and a second transmit beam resource for the served UE to perform beam management on a sidelink channel; identifying a mode for performing beam management using the first transmit beam resource and the second transmit beam resource based at least in part on the first configuration signal; and performing beam management on a sidelink channel using the first transmit beam resource and the second transmit beam resource according to the mode.

[0222] Aspect 2: The method of aspect 1, wherein performing beam management includes: monitoring reference signal transmission using a first receive beam of the served UE at least in part based on a first transmit beam resource; and monitoring reference signal transmission using repeated transmissions with the same antenna port at least in part based on a second transmit beam resource.

[0223] Aspect 3: The method of aspect 2, wherein monitoring using the first receive beam is performed concurrently, coherently, or using time-division multiplexing with monitoring reference signal transmission by sweeping the receive beam set of the served UE.

[0224] Aspect 4: The method of any one of Aspects 2 to 3 further includes alternating between monitoring using a first receive beam and monitoring by sweeping a set of receive beams between successive symbols, or successive mini-slots, or successive slots, or successive subframes, or combinations thereof.

[0225] Aspect 5: The method of any one of Aspects 2 to 4 further includes: transmitting a first feedback message identifying the result of monitoring using a first receiving beam; and transmitting a second feedback message identifying the result of monitoring by sweeping a set of receiving beams.

[0226] Aspect 6: The method of any one of Aspects 1 to 5 further includes: monitoring at least in part based on a first receive beam of the served UE, identifying one or more transmit beam candidates according to a reference signal transmission; transmitting a feedback message identifying the one or more transmit beam candidates; and resetting a second transmit beam resource at least in part based on the feedback message.

[0227] Aspect 7: The method of any one of Aspects 1 to 6, wherein performing beam management includes: monitoring a first reference signal transmission based at least in part on a first transmit beam resource including a first repeated transmission using the same first antenna port; and monitoring a second reference signal transmission based at least in part on a second transmit beam resource including a second repeated transmission using the same second antenna port.

[0228] Aspect 8: The method of aspect 7, wherein monitoring the transmission of the first reference signal by sweeping the received beam set of the served UE is performed concurrently, sequentially, or using time-division multiplexing with monitoring the transmission of the second reference signal by sweeping the received beam set.

[0229] Aspect 9: The method of any one of Aspects 7 to 8 further includes: alternating between monitoring the transmission of a first reference signal and monitoring the transmission of a second reference signal between successive symbols, or successive mini-slots, or successive slots, or successive subframes, or combinations thereof.

[0230] Aspect 10: The method of any one of Aspects 7 to 9 further includes: transmitting a first feedback message identifying the result of monitoring the transmission of a first reference signal; and transmitting a second feedback message identifying the result of monitoring the transmission of a second reference signal.

[0231] Aspect 11: The method of any one of Aspects 1 to 10, wherein performing beam management includes: monitoring reference signal transmission using a first receive beam of the served UE at least in part based on a first transmit beam resource; and monitoring multiple instances of a second reference signal transmission using repeated transmissions at the same antenna port at least in part based on a second transmit beam resource.

[0232] Aspect 12: The method of aspect 11, wherein monitoring the reference signal transmission is performed concurrently, sequentially, or using time-division multiplexing with multiple instances of monitoring the second reference signal transmission by sweeping the received beam set of the served UE.

[0233] Aspect 13: The method of any one of Aspects 11 to 12 further includes alternating between multiple instances of monitoring reference signal transmission and monitoring second reference signal transmission between successive symbols, or successive mini-slots, or successive slots, or successive subframes, or combinations thereof.

[0234] Aspect 14: The method of any one of Aspects 11 to 13 further includes: transmitting a first feedback message identifying the result of monitoring a reference signal transmission; transmitting a second feedback message identifying the result of monitoring a plurality of instances of a second reference signal transmission; and resetting a second transmit beam resource based at least in part on at least one of the following: the first feedback message, or the second feedback message, or a combination thereof.

[0235] Aspect 15: The method of any one of Aspects 11 to 14, wherein the first transmit beam resource corresponds to a first plurality of reference signal resource sets; and the second transmit beam resource corresponds to a second plurality of reference signal resource sets.

[0236] Aspect 16: The method of any one of Aspects 1 to 15, wherein the first configuration signal configures the first transmit beam resource as a first reference signal resource set and a second reference signal resource set, and configures the second transmit beam resource as a third reference signal resource set, wherein the second reference signal resource set and the third reference signal resource set are configured with repetition enabled for beam management.

[0237] Aspect 17: The method of any one of Aspects 1 to 16, wherein the first transmit beam resource includes a first channel state information reference signal (CSI-RS) resource set, and the second transmit beam resource includes a second CSI-RS resource set.

[0238] Aspect 18: The method of any one of Aspects 1 to 17, wherein the first transmit beam resource includes a first subset of the Channel State Information Reference Signal (CSI-RS) resource set, and the second transmit beam resource includes a second subset of the CSI-RS resource set.

[0239] Aspect 19: A method for wireless communication, comprising: transmitting a first configuration signal that configures a served UE to have a first transmit beam resource and a second transmit beam resource for the served UE to perform beam management on a sidelink channel; using the first transmit beam resource to transmit one or more first reference signals and using the second transmit beam resource to transmit one or more second reference signals; and receiving a feedback message based at least in part on the transmission of the one or more first reference signals, the one or more second reference signals, or both.

[0240] Aspect 20: The method of aspect 19 further includes: selecting at least one third transmit beam resource based at least in part on the feedback message; and transmitting a second configuration signal to the served UE, the second configuration signal identifying the third transmit beam resource as an alternative to the first transmit beam resource or the second transmit beam resource.

[0241] Aspect 21: The method of any one of Aspects 19 to 20, wherein receiving the feedback message comprises: receiving a first feedback message at least in part based on the one or more first reference signals; and receiving a second feedback message at least in part based on the one or more second reference signals.

[0242] Aspect 22: The method of any one of aspects 19 to 21, wherein the transmission of the one or more first reference signals and the one or more second reference signals is performed concurrently, sequentially, or using time-division multiplexing.

[0243] Aspect 23: The method of any one of aspects 19 to 22, wherein the transmission of the one or more first reference signals and the one or more second reference signals is performed between successive symbols, or successive mini-slots, or successive slots, or successive subframes, or combinations thereof.

[0244] Aspect 24: The method of any one of Aspects 19 to 23, wherein the first transmit beam resource includes a first channel state information reference signal (CSI-RS) resource set, and the second transmit beam resource includes a second CSI-RS resource set.

[0245] Aspect 25: The method of any one of Aspects 19 to 24, wherein the first transmit beam resource includes a first subset of the Channel State Information Reference Signal (CSI-RS) resource set, and the second transmit beam resource includes a second subset of the CSI-RS resource set.

[0246] Aspect 26: An apparatus for performing wireless communication at a served UE, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method of any one of Aspects 1 to 18.

[0247] Aspect 27: An apparatus for wireless communication at a served UE, comprising at least one means for performing the method as described in any one of Aspects 1 to 18.

[0248] Aspect 28: A non-transient computer-readable medium storing code for wireless communication at a served UE, the code including instructions executable by a processor to perform a method as described in any one of methods 1 to 18.

[0249] Aspect 29: An apparatus for wireless communication, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method of any one of aspects 19 to 25.

[0250] Aspect 30: An apparatus for conducting wireless communication includes at least one means for performing the method of any one of aspects 19 to 25.

[0251] Aspect 31: A non-transient computer-readable medium storing code for wireless communication, the code including instructions executable by a processor to perform the method as described in any one of aspects 19 to 25.

[0252] The techniques described in this article can be used in various wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), and others. CDMA systems can implement radio technologies such as CDMA2000 and Universal Terrestrial Radio Access (UTRA). CDMA2000 encompasses the IS-2000, IS-95, and IS-856 standards. Versions of IS-2000 are often referred to as CDMA2000 1X, 1X, etc. IS-856 (TIA-856) is often referred to as CDMA2000 1xEV-DO, High Rate Packet Data (HRPD), etc. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. TDMA systems can implement radio technologies such as Global System for Mobile Communications (GSM).

[0253] OFDMA systems can implement radio technologies such as Ultra Mobile Broadband (UMB), Evolved UTRA (E-UTRA), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, and Flash-OFDM. UTRA and E-UTRA are part of the Universal Mobile Telecommunications System (UMTS). LTE, LTE-A, and LTE-A Pro are UMTS versions using E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, LTE-A Pro, NR, and GSM are described in documents from an organization called the 3rd Generation Partnership Project (3GPP). CDMA2000 and UMB are described in documents from an organization called the 3rd Generation Partnership Project 2 (3GPP2). The technologies described herein can be used with the systems and radio technologies mentioned herein, as well as with other systems and radio technologies. Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for illustrative purposes, and the terms LTE, LTE-A, LTE-A Pro, or NR may be used in most of the descriptions, the techniques described herein may also be applied to applications beyond LTE, LTE-A, LTE-A Pro, or NR applications.

[0254] Macrocells typically cover a relatively large geographic area (e.g., a radius of several kilometers) and allow unrestricted access by UEs with service subscriptions to a network provider. Small cells may be associated with lower-power base stations (compared to macrocells) and may operate in the same or different (e.g., licensed, unlicensed, etc.) frequency bands as macrocells. Depending on the examples, small cells may include picocells, femtocells, and microcells. Picocells, for example, may cover a smaller geographic area and allow unrestricted access by UEs with service subscriptions to a network provider. Femtocells may also cover a smaller geographic area (e.g., a residential area) and provide restricted access by UEs associated with that femtocell (e.g., UEs in a closed subscriber group (CSG), UEs of users in that residence, etc.). An eNB used for a macrocell may be referred to as a macro eNB. An eNB used for a small cell may be referred to as a small cell eNB, pico eNB, femtocell eNB, or home eNB. eNB can support one or more (e.g., two, three, four, etc.) cells and can also support communication using one or more component carriers.

[0255] The wireless communication system described herein can support synchronous or asynchronous operation. For synchronous operation, base stations can have similar frame timings, and transmissions from different base stations can be approximately time-aligned. For asynchronous operation, base stations can have different frame timings, and transmissions from different base stations may not be time-aligned. The techniques described herein can be used for both synchronous and asynchronous operation.

[0256] The information and signals described herein can be represented using any of a wide variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout this description can be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or light particles, or any combination thereof.

[0257] The various illustrative blocks and modules described herein can be implemented or executed using 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 herein. The general-purpose processor may be a microprocessor, but in alternatives, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors working in conjunction with a DSP core, or any other such configuration).

[0258] The functions described herein can be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions can be stored or transmitted as one or more instructions or code on a computer-readable medium. Other examples and implementations fall within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described herein can be implemented using software executed by a processor, hardware, firmware, hardwired, or any combination thereof. Features implementing the functions can also be physically located in various locations, including being distributed such that different parts of the function are implemented at different physical locations.

[0259] Computer-readable media includes both non-transient computer storage media and communication media, encompassing any medium that facilitates the transfer of a computer program from one location to another. Non-transient storage media can be any available medium accessible to a general-purpose or special-purpose computer. By way of example and not limitation, non-transient computer-readable media may include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), flash memory, compact disc (CD) ROM or other optical disc storage, magnetic disk storage or other magnetic storage devices, or any other non-transient medium that can be used to carry or store desired program code in the form of instructions or data structures and is accessible to a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Similarly, any connection is also legitimately referred to as computer-readable media. For example, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then that coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of media. As used in this article, disk and disc include CDs, laser discs, optical discs, DVDs, floppy disks, and Blu-ray discs, where disks often magnetically reproduce data while discs optically reproduce data using lasers. Combinations of these media are also included within the scope of computer-readable media.

[0260] As used herein (including in the claims), the word "or" in an enumeration of items (e.g., an enumeration of items accompanied by phrases such as "at least one of" or "one or more of") indicates an inclusive enumeration, such that an enumeration of at least one of, for example, A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Similarly, as used herein, the phrase "based on" should not be construed as referencing a closed set of conditions. For example, an exemplary step described as "based on condition A" may 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 "at least partially based on".

[0261] In the accompanying drawings, similar components or features may have the same reference numerals. Furthermore, components of the same type may be distinguished by a dash following the reference numeral and a second reference numeral used to differentiate between similar components. If only the first reference numeral is used in the description, the description may apply to any of the similar components having the same first reference numeral, regardless of the second reference numeral or other subsequent reference numerals.

[0262] This document, illustrated with reference to the accompanying drawings, describes exemplary configurations but does not represent all examples that can be implemented or fall within the scope of the claims. The term "exemplary" as used herein means "serving as an example, instance, or illustration" and does not mean "superior to" or "outperforms" other examples. This detailed description includes specific details to provide an understanding of the described techniques. However, these techniques may be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0263] The description provided herein is intended to enable those skilled in the art to make or use this disclosure. Various modifications to this disclosure will be apparent to those skilled in the art, and the universal principles defined herein can be applied to other variations without departing from the scope of this disclosure. Thus, this disclosure is not limited to the examples and designs described herein, but should be granted the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An apparatus for conducting wireless communication at a served user equipment (UE), comprising: A means for receiving a first configuration signal, the first configuration signal configuring a served UE to have a first transmit beam resource and a second transmit beam resource for the served UE to perform beam management on a sidelink channel; A means for identifying a mode for performing beam management using the first transmit beam resource and the second transmit beam resource, based at least in part on the first configuration signal; as well as A means for performing beam management on the side link channel using the first transmit beam resources and the second transmit beam resources according to the mode.

2. The apparatus of claim 1, wherein the means for performing the beam management further comprises: A means for monitoring reference signal transmission using a first receive beam of the served UE at least in part based on the first transmit beam resource; as well as A means for monitoring reference signal transmission based at least in part on the second transmit beam resource, including repeated transmissions using the same antenna port.

3. The apparatus of claim 2, wherein the means for monitoring using the first receiving beam is performed concurrently, sequentially, or time-division multiplexed with the means for monitoring reference signal transmission by sweeping the receiving beam set of the served UE.

4. The device as claimed in claim 2, further comprising: Means for alternating between means for monitoring using the first receive beam and means for monitoring by sweeping the receive beam set between successive symbols, or successive mini-slots, or successive slots, or successive subframes, or combinations thereof.

5. The device of claim 2, further comprising: A means for transmitting a first feedback message, the first feedback message identifying the result of monitoring using the first receiving beam; as well as A means for transmitting a second feedback message, the second feedback message identifying the result of monitoring via a swept receive beam set.

6. The device of claim 1, further comprising: A means for identifying one or more transmit beam candidates based at least in part on a means for monitoring using a first receive beam of the served UE, according to a reference signal transmission; A means for transmitting a feedback message identifying the one or more transmit beam candidates; as well as A means for resetting the second transmit beam resource based at least in part on the feedback message.

7. The apparatus of claim 1, wherein the means for performing the beam management further comprises: A means for monitoring the transmission of a first reference signal based at least in part on the first transmit beam resource, including a first repeated transmission using the same first antenna port; as well as A means for monitoring the transmission of a second reference signal based at least in part on the second transmit beam resource, including a second repeated transmission using the same second antenna port.

8. The apparatus of claim 7, wherein the means for monitoring the transmission of the first reference signal by sweeping the received beam set of the served UE is performed concurrently, sequentially, or time-division multiplexed with the means for monitoring the transmission of the second reference signal by sweeping the received beam set.

9. The device of claim 7, further comprising: Means for alternating between means for monitoring the transmission of the first reference signal and means for monitoring the transmission of the second reference signal between successive symbols, or successive mini-slots, or successive slots, or successive subframes, or combinations thereof.

10. The device of claim 7, further comprising: A means for transmitting a first feedback message, wherein the first feedback message identifies the result of monitoring the transmission of the first reference signal; as well as A means for transmitting a second feedback message, the second feedback message identifying the result of monitoring the transmission of the second reference signal.

11. The apparatus of claim 1, wherein the means for performing the beam management further comprises: A means for monitoring reference signal transmission using a first receive beam of the served UE at least in part based on the first transmit beam resource; as well as A means for monitoring multiple instances of a second reference signal transmission based at least in part on the second transmit beam resource, including repeated transmissions using the same antenna port.

12. The apparatus of claim 11, wherein the means for monitoring the transmission of the reference signal is performed concurrently, sequentially, or time-division multiplexed with the means for monitoring the transmission of the second reference signal by sweeping the received beam set of the served UE.

13. The apparatus of claim 11, further comprising: Means for alternating between means for monitoring the transmission of the reference signal and means for monitoring the transmission of the second reference signal among successive symbols, or successive mini-slots, or successive slots, or successive subframes, or combinations thereof.

14. The apparatus of claim 11, further comprising: A means for transmitting a first feedback message, the first feedback message identifying the result of monitoring the transmission of the reference signal; A means for transmitting a second feedback message, the second feedback message identifying the result of monitoring the plurality of instances of the transmission of the second reference signal; as well as A means for resetting the second transmit beam resource based at least in part on one of the following: the first feedback message, the second feedback message, or a combination thereof.

15. The apparatus of claim 11, wherein: The first transmit beam resource corresponds to a first plurality of reference signal resource sets; and The second transmit beam resource corresponds to a second set of multiple reference signal resources.

16. The device of claim 1, wherein the first configuration signal configures the first transmit beam resource as a first reference signal resource set and a second reference signal resource set, and configures the second transmit beam resource as a third reference signal resource set, wherein the second reference signal resource set and the third reference signal resource set are configured with repetition enabled for beam management.

17. The apparatus of claim 1, wherein the first transmit beam resource includes a first channel state information reference signal (CSI-RS) resource set, and the second transmit beam resource includes a second CSI-RS resource set.

18. The apparatus of claim 1, wherein the first transmit beam resource includes a first subset of a channel state information reference signal (CSI-RS) resource set, and the second transmit beam resource includes a second subset of the CSI-RS resource set.

19. A device for wireless communication, comprising: A means for transmitting a first configuration signal, the first configuration signal configuring a served UE to have a first transmit beam resource and a second transmit beam resource for the served UE to use for beam management on a side link channel; An apparatus for transmitting one or more first reference signals using the first transmit beam resources and transmitting one or more second reference signals using the second transmit beam resources; as well as A means for receiving feedback messages based at least in part on the transmission of one or more first reference signals, one or more second reference signals, or both.

20. The apparatus of claim 19, further comprising: A means for selecting at least one third transmit beam resource based at least in part on the feedback message; as well as A means for transmitting a second configuration signal to the served UE, the second configuration signal identifying the third transmit beam resource as an alternative to the first transmit beam resource or the second transmit beam resource.

21. The apparatus of claim 19, wherein the means for receiving the feedback message further comprises: A means for receiving a first feedback message based at least in part on the one or more first reference signals; as well as A means for receiving a second feedback message based at least in part on the one or more second reference signals.

22. The apparatus of claim 19, wherein the transmission of the one or more first reference signals and the one or more second reference signals is performed concurrently, sequentially, or using time-division multiplexing.

23. The apparatus of claim 19, wherein the transmission of the one or more first reference signals and the one or more second reference signals is performed between successive symbols, or successive mini-slots, or successive slots, or successive subframes, or a combination thereof.

24. The apparatus of claim 19, wherein the first transmit beam resource includes a first channel state information reference signal (CSI-RS) resource set, and the second transmit beam resource includes a second CSI-RS resource set.

25. The apparatus of claim 19, wherein the first transmit beam resource includes a first subset of a channel state information reference signal (CSI-RS) resource set, and the second transmit beam resource includes a second subset of the CSI-RS resource set.

26. A method for conducting wireless communication at a served user equipment (UE), comprising: Receive a first configuration signal, the first configuration signal configuring the served UE to have a first transmit beam resource and a second transmit beam resource for the served UE to perform beam management on the side link channel; The mode for performing beam management using the first transmit beam resources and the second transmit beam resources is identified at least in part based on the first configuration signal; as well as According to the mode, the first transmit beam resources and the second transmit beam resources are used to perform the beam management on the side link channel.

27. The method of claim 26, wherein performing the beam management comprises: The first receive beam of the servicing UE is used to monitor reference signal transmission at least in part based on the first transmit beam resource; as well as The monitoring of reference signal transmission is based at least in part on the second transmit beam resources, including repeated transmissions using the same antenna port.

28. The method of claim 27, wherein: Monitoring using the first receive beam is performed concurrently, sequentially, or using time-division multiplexing, with respect to monitoring reference signal transmissions by sweeping the receive beam set of the served UE.

29. A method for wireless communication, comprising: A first configuration signal is transmitted, which configures the served UE to have a first transmit beam resource and a second transmit beam resource for the served UE to use for beam management on the side link channel; The first transmit beam resource is used to transmit one or more first reference signals, and the second transmit beam resource is used to transmit one or more second reference signals; as well as Feedback messages are received at least in part based on the transmission of one or more first reference signals, one or more second reference signals, or both.

30. The method of claim 29, further comprising: At least one third transmit beam resource is selected based at least in part on the feedback message; as well as A second configuration signal is transmitted to the served UE, the second configuration signal identifying the third transmit beam resource as a substitute for the first transmit beam resource or the second transmit beam resource.

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