Timeline considerations for channel state information reporting for sidelink channels

Abstract

Methods, systems, and devices for wireless communications are described. In some systems, a base station may use control information to trigger a CSI reporting process to aperiodically update channel state information (CSI) on a sidelink between a first user equipment (UE) and one or more second UEs. The aperiodic CSI process may include the base station sending timing requirements and control information to the UE. The control information containing the CSI request may be received and decoded at the UE. Based on the CSI request, the first UE may send a reference signal on the sidelink for measurement by the second UE. The UE (or multiple) may generate a CSI report and send it to the first UE on the sidelink, and the first UE may aggregate the received CSI report (or multiple) and send it to the base station within a time period specified by the timing requirements received in the control information.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of Greek Provisional Patent Application No. 20190100336, filed by Manolakos et al. on August 6, 2019, entitled “Timeline Considerations for Channel State Information Reporting of a Sidelink Channel,” and U.S. Patent Application No. 16 / 911,209, filed by Manolakos et al. on June 24, 2020, entitled “Timeline Considerations for Channel State Information Reporting of aSidelink Channel,” each of which has been assigned to the assignee of this Agreement. Background Art

[0003] The following relates generally to wireless communications, and more specifically to timeline considerations for channel state information reporting for a sidelink channel.

[0004] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcast, etc. These systems 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 advanced (LTE-A) systems, or LTE-A professional systems, and fifth generation (5G) systems, which may be referred to as new radio (NR) systems. These systems may employ techniques such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include multiple base stations or network access nodes, each of which simultaneously supports communication with multiple communication devices, which may be referred to as user equipment (UE).

[0005] Some wireless communication systems may support both access links and side links. The access link is a communication link between a UE and a base station. In some examples, the access link may be referred to as a Uu interface. Specifically, the Uu interface may refer to an air interface for downlink transmission, uplink transmission, or both. A side link is a communication link between similar devices. For example, a side link may support communication between multiple UEs, or may support communication between multiple base stations. In some examples, the access link may be referred to as a PC5 interface (e.g., supporting vehicle-to-everything (V2X) and / or vehicle-to-vehicle (V2V) communication between vehicles in a system). In some cases, the side link may be referred to as a device-to-device (D2D) link, and may support unicast messaging, broadcast messaging, or both. In some cases, a base station may instruct a UE to send a reference signal on a side link, and one or more UEs may measure and respond to the reference signal using a channel state information (CSI) report of a side link channel. The transmitting UE connected to the base station may then decode and send a CSI report to the base station. Unless timing details are configured, the wireless communication system may not be able to coordinate this reporting timeline. Summary of the invention

[0006] The described techniques relate to improved methods, systems, devices and apparatuses for supporting timeline considerations for channel state information (CSI) reporting of sidelink channels. In general, the described techniques improve the coordination of CSI reporting timelines based on process initialization by downlink control information (DCI). As described herein, sidelink communication may refer to any communication between a first user equipment (UE) and a second UE in a wireless communication system, such as device-to-device (D2D) communication, vehicle-to-everything (V2X) and / or vehicle-to-vehicle (V2V) communication, message relay, discovery signaling, beacon signaling, or any combination of these or other signals transmitted over the air from one UE to one or more other UEs.

[0007] In some cases, the base station can coordinate the sidelink communication between UEs. For example, the base station can schedule the CSI report of the sidelink via downlink communication to all UEs involved in the sidelink communication. In another example, the base station can schedule the CSI report of the sidelink via downlink communication to some UEs (e.g., UE1) involved in the sidelink communication based on one or more UEs (e.g., UE2) outside the coverage of the base station. There may be UEs connected to the base station (e.g., capable of downlink and uplink communication), the base station sends a reference signal on the sidelink, and one or more UEs can measure and respond to the reference signal using the CSI report of the sidelink channel.

[0008] In order to coordinate the CSI timeline when measuring the sidelink channel, the base station may define a new time requirement Z". The new time requirement may correspond to the time required for the connected UE (e.g., UE1) to aggregate and send the sidelink CSI report. Z" may be after the connected UE has received the CSI report from the sidelink UE. In some cases, the time requirement Z" may be based on the capabilities of the connected UE. In some cases, a CSI reception time window may be configured for the connected UE, which defines the time the connected UE should attempt to receive CSI reports from the sidelink channel before discarding or using false CSI reports for those unreceived CSI reports. This may avoid delays caused by the UE waiting for CSI reports from the sidelink that may not have been received within the time window. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 and Figure 2 An example of a system for wireless communication supporting timeline considerations for channel state information reporting of a sidelink channel in accordance with various aspects of the present disclosure is shown,

[0010] Figure 3 and Figure 4 An example of a process flow is shown that supports timeline considerations for channel state information reporting for a sidelink channel in accordance with various aspects of the present disclosure.

[0011] Figure 5 An example of an architecture that supports timeline considerations for channel state information reporting for a sidelink channel in accordance with various aspects of the present disclosure is shown.

[0012] Figure 6 and Figure 7 A block diagram illustrating a device supporting timeline considerations for channel state information reporting for a sidelink channel in accordance with various aspects of the present disclosure.

[0013] Figure 8 A block diagram of a communications manager supporting timeline considerations for channel state information reporting for a sidelink channel in accordance with various aspects of the present disclosure is shown.

[0014] Fig. 9 A diagram illustrating a system of devices including timeline considerations supporting channel state information reporting for a sidelink channel in accordance with various aspects of the present disclosure.

[0015] Fig.10 and Fig.11 A block diagram illustrating a device supporting timeline considerations for channel state information reporting for a sidelink channel in accordance with various aspects of the present disclosure.

[0016] Fig.12A block diagram of a communications manager supporting timeline considerations for channel state information reporting for a sidelink channel in accordance with various aspects of the present disclosure is shown.

[0017] Fig.13 A diagram illustrating a system of devices including timeline considerations supporting channel state information reporting for a sidelink channel in accordance with various aspects of the present disclosure.

[0018] Figures 14 to 21 A flow chart illustrating a method of supporting timeline considerations for channel state information reporting for a sidelink channel in accordance with various aspects of the present disclosure is shown. DETAILED DESCRIPTION

[0019] A wireless communication system may support access links and side links for communication between wireless devices. An access link may refer to any communication link between a user equipment (UE) and a base station. For example, an access link may support uplink signaling, downlink signaling, connection procedures, etc. A side link may refer to any communication link between UEs. For example, a side link may support device-to-device (D2D) communication, vehicle-to-everything (V2X) and / or vehicle-to-vehicle (V2V) communication, message relay, discovery signaling, beacon signaling, or any combination of these or other signals transmitted over the air from one UE to one or more other UEs.

[0020] Example sidelink channels for sidelink communication may include a physical sidelink discovery channel (PSDCH), a physical sidelink control channel (PSCCH), a physical sidelink shared channel (PSSCH), and a physical sidelink feedback channel (PSFCH). PSDCH may carry discovery expressions so that near-end devices can discover each other's presence. PSCCH may carry resources and other parameters for data (e.g., PSSCH). In some cases, before decoding PSCCH, it is assumed that the receiving UE knows the starting symbol and number of symbols of PSCCH. PSSCH may carry data, and for operations on PSSCH, the UE may perform transmission or reception in a time slot on a carrier. For new radio (NR) systems, there may be two or more PSSCH options for UEs. In one example, all symbols in a time slot may be used for a sidelink (e.g., PSSCH). In another example, a subset of consecutive symbols in a time slot may be used for a sidelink (e.g., PSSCH). PSFCH may carry feedback information, and in NR systems, a sequence-based PSFCH format with one symbol (excluding automatic gain control (AGC) training period) may be supported.

[0021] In some wireless communication systems, a base station may use control information (e.g., downlink control information (DCI) or sidelink control information) to aperiodically update its channel state information (CSI) on a sidelink between a first UE (e.g., UE1) and one or more second UEs (e.g., UE2) to trigger a CSI reporting process. The aperiodic CSI process may include the base station sending control information containing timing requirements to UE1 and optionally to UE2. The control information containing the CSI request may be received and decoded at UE1. UE2 may receive the control information from the base station or UE1 and decode the CSI request. Based on the CSI request, UE1 may send an aperiodic reference signal (AP-RS) on the sidelink for UE2 to measure. After UE2 measures the AP-RS, UE2 may generate a CSI report and send it to UE1 on the sidelink. UE1 may then receive one or more CSI reports, decode the one or more CSI reports, and report them to the base station. UE1 may aggregate the decoded one or more CSI reports and send them to the base station within a time period specified by the timing requirements received in the control information. The timing requirements may be based on the capabilities of UE1.

[0022] In addition, the base station may configure (e.g., semi-statically configure) a receiving time window for UE1. Specifically, all CSI reports may be expected to be received within a specified or configured receiving time window (e.g., X time slots). CSI reports not received within a specified or configured receiving time window may not be aggregated with CSI reports received within a specified or configured receiving time window. Instead, late CSI reports may be discarded, or forged CSI reports may be used instead of expected reports. Forged reports may include dummy information (e.g., zero) or previous CSI reports (e.g., stale reports).

[0023] Various aspects of the invention are initially described in the context of a wireless communication system. Additional aspects are described with reference to process flows. Various aspects of the invention are further illustrated and described by apparatus diagrams, system diagrams, and flow charts related to timeline considerations for channel state information reporting of a sidelink channel.

[0024] Figure 1An example of a wireless communication system 100 is shown that supports timeline considerations for channel state information reporting of a sidelink channel in accordance with various aspects of the present disclosure. The wireless communication system 100 includes a base station 105, a UE 115, and a core network 130. In some examples, the wireless communication system 100 may be a long term evolution (LTE) network, an LTE advanced (LTE-A) network, an LTE-A professional network, or a new radio (NR) network. In some cases, the wireless communication system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission-critical) communications, low-latency communications, or communications with low-cost and low-complexity devices.

[0025] The base station 105 may communicate wirelessly with the UE 115 via one or more base station antennas. The base station 105 described herein may include or may be referred to by those skilled in the art as a base transceiver station, a wireless base station, an access point, a wireless transceiver, a NodeB, an eNodeB (eNB), a next generation NodeB or a giga NodeB (any of which may be referred to as a gNB), a Home NodeB, a HomeeNodeB, or other suitable terms. The wireless communication system 100 may include different types of base stations 105 (e.g., macro or small cell base stations). The UE 115 described herein may be able to communicate with various types of base stations 105 and network devices including macro eNBs, small cell eNBs, gNBs, relay base stations, etc.

[0026] Each base station 105 may be associated with a particular geographic coverage area 110 in which communications with various UEs 115 are supported. Each base station 105 may provide communications coverage for a respective geographic coverage area 110 via a communications link 125, and the communications link 125 between the base station 105 and the UE 115 may utilize one or more carriers. The communications link 125 shown in the wireless communication system 100 may include an uplink transmission from the UE 115 to the base station 105, or a downlink transmission from the base station 105 to the UE 115. Downlink transmissions may also be referred to as forward link transmissions, and uplink transmissions may also be referred to as reverse link transmissions.

[0027] The geographic coverage area 110 of the base station 105 can be divided into sectors that constitute a portion 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 for a macro cell, a small cell, a hotspot, or other types of cells, or various combinations thereof. In some examples, the base station 105 can be mobile, thereby providing communication coverage for a mobile geographic coverage area 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 may include, for example, a heterogeneous LTE / LTE-A / LTE-A Pro or NR network, in which different types of base stations 105 provide coverage for various geographic coverage areas 110.

[0028] The term "cell" refers to a logical communication entity for communicating with a base station 105 (e.g., via a carrier), and may be associated with an identifier (e.g., a physical cell identifier (PCID), a virtual cell identifier (VCID)) for distinguishing adjacent cells operating via the same or different carriers. In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types that may provide access to different types of devices (e.g., machine type communication (MTC), narrowband Internet of Things (NB-IoT), enhanced mobile broadband (eMBB), or other). In some cases, the term "cell" may refer to a portion of a geographic coverage area 110 (e.g., a sector) on which the logical entity operates.

[0029] UE 115 can be dispersed throughout the wireless communication system 100, and each UE 115 can be fixed or mobile. UE 115 can also be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where "device" can also be referred to as a unit, a station, a terminal, or a client. UE 115 can also be a personal electronic device such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, UE 115 can also refer to a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Things (IoE) device, or an MTC device, etc., which can be implemented in various items such as devices, vehicles, meters, etc.

[0030] Some UEs 115, such as MTC or IoT devices, may be low-cost or low-complexity devices and may provide automatic communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC may refer to data communication technology that allows devices to communicate with each other or with a base station 105 without human intervention. In some examples, M2M communication or MTC may include communications from devices that integrate sensors or meters to measure or capture information and relay that information to a central server or application, which may utilize the information or present it to a person interacting with the program or application. Some UEs 115 may be designed to collect information or implement automatic behavior of machines. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, medical monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based business charging.

[0031] Some UEs 115 may be configured to employ a reduced power consumption mode of operation, such as half-duplex communication (e.g., a mode that supports unidirectional communication via transmission or reception but not simultaneous transmission and reception). In some examples, half-duplex communication may be performed 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 communications or operating over limited bandwidth (e.g., in accordance with narrowband communications). In some cases, UE 115 may be designed to support critical functions (e.g., mission critical functions), and the wireless communication system 100 may be configured to provide ultra-reliable communications for these functions.

[0032] In some cases, UE 115 may also communicate directly with other UE 115 (e.g., using a peer-to-peer (P2P) or device-to-device (D2D) protocol). One or more of a group of UEs 115 utilizing D2D communication may be within a geographic coverage area 110 of a base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of the base station 105 or may not be able to receive transmissions from the base station 105. In some cases, a group of UEs 115 communicating via D2D communication may utilize a one-to-many (1:M) system, in which each UE 115 transmits to each other UE 115 in the group. In some cases, the base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between UEs 115 without involving the base station 105.

[0033] The base stations 105 may communicate with the core network 130 or with each other. For example, the base stations 105 may interface with the core network 130 via a backhaul link 132 (e.g., via an S1, N2, N3, or other interface). The base stations 105 may communicate with each other directly (e.g., directly between the base stations 105) or indirectly (e.g., via the core network 130) via a backhaul link 134 (e.g., via an X2, Xn, or other interface).

[0034] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connections, and other access, routing, or mobility functions. The 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 may manage non-access stratum (e.g., control plane) functions such as mobility, authentication, and bearer management of UE 115 served by a base station 105 associated with the EPC. User IP packets may be transmitted through the S-GW, which itself may be connected to the P-GW. The P-GW may provide IP address allocation and other functions. The P-GW may be connected to a network operator IP service. Operator IP services may include access to the Internet, an intranet, an IP multimedia subsystem (IMS), or a packet switched (PS) streaming service.

[0035] At least some network devices, such as base stations 105, may include subcomponents, such as access network entities, which may be examples of access node controllers (ANCs). Each access network entity may communicate with UE 115 through multiple other access network transmission entities, which may be referred to as radio heads, smart radio heads, or transmit / receive points (TRPs). 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 heads and access network controllers) or combined into a single network device (e.g., base station 105).

[0036] The wireless communication system 100 can operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Typically, the region from 300 MHz to 3 GHz is referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelength range is approximately 1 decimeter to 1 meter long. UHF waves may be blocked or redirected by buildings and environmental features. However, the waves can penetrate the structure sufficiently so that the macrocell provides service to the UE 115 located indoors. Compared to transmissions using smaller frequencies and longer waves in the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz, transmissions of UHF waves can be associated with smaller antennas and shorter ranges (e.g., less than 100 km).

[0037] The wireless communication system 100 may also operate in the Super High Frequency (SHF) region using a frequency band from 3 GHz to 30 GHz (also referred to as a centimeter band). The SHF region includes frequency bands such as the 5 GHz Industrial, Scientific, and Medical (ISM) band, which may be used by devices that can tolerate interference from other users.

[0038] The wireless communication system 100 can also operate in the extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz), also known as the millimeter wave band. In some examples, the wireless communication system 100 can support millimeter wave (mmW) communications between the UE 115 and the base station 105, and the EHF antennas of the corresponding devices can be smaller and closer than the UHF antennas. In some cases, this may facilitate the use of antenna arrays within the UE 115. However, the propagation of EHF transmissions may be affected by greater atmospheric attenuation and shorter range than SHF or UHF transmissions. The technology disclosed herein can be used across transmissions using one or more different frequency regions, and the designated use of frequency bands across these frequency regions may vary from country to country or regulatory agency.

[0039] In some cases, the wireless communication system 100 can use licensed and unlicensed radio spectrum bands. For example, the wireless communication system 100 can adopt license assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band such as the 5GHz ISM band. When operating in an unlicensed radio spectrum band, wireless devices such as base stations 105 and UE 115 can adopt a listen-before-talk (LBT) process to ensure that the frequency channel is clear before sending data. In some cases, operations in unlicensed bands can be based on carrier aggregation configurations combined with component carriers operating in licensed bands (e.g., LAA). Operations in unlicensed spectrum can include downlink transmissions, uplink transmissions, peer-to-peer transmissions, or a combination of these. Duplexing in unlicensed spectrum can be based on frequency division duplexing (FDD), time division duplexing (TDD), or a combination of both.

[0040] In some examples, the base station 105 or the UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. For example, the wireless communication system 100 may use a transmission scheme between a transmitting device (e.g., a base station 105) and a receiving device (e.g., a 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 improve spectral efficiency by transmitting or receiving multiple signals via different spatial layers, which may be referred to as spatial multiplexing. For example, multiple signals may be transmitted by a transmitting device via different antennas or different antenna combinations. Similarly, multiple signals may be received by a receiving device via different antennas or different antenna combinations. Each of the multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams. Different spatial layers may be associated with different antenna ports for channel measurement and reporting. MIMO technology includes single-user MIMO (SU-MIMO), where multiple spatial layers are sent to the same receiving device, and multi-user MIMO (MU-MIMO), where multiple spatial layers are sent to multiple devices.

[0041] Beamforming, which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105 or a UE 115) to shape or steer an antenna beam (e.g., a transmit beam or a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining signals transmitted via antenna elements of an antenna array so that signals propagating in a particular direction relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to signals transmitted via antenna elements may include the transmitting device or the receiving device applying certain amplitude and phase offsets to signals transmitted via each antenna element associated with the device. Adjustments associated with each antenna element may be defined by a set of beamforming weights associated with a particular direction (e.g., relative to the antenna array of the transmitting device or the receiving device, or relative to some other direction).

[0042] In one example, the base station 105 may use multiple antennas or antenna arrays to direct beamforming operations for directional communications with the UE 115. For example, some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be sent multiple times by the base station 105 in different directions, which may include signals sent according to different beamforming weight sets associated with different transmission directions. The transmissions in different beam directions may be used (e.g., by the base station 105 or a receiving device, such as the UE 115) to identify the beam direction for subsequent transmission and / or reception by the base station 105.

[0043] Some signals, such as data signals associated with a particular receiving device, may be transmitted by base station 105 in a single beam direction (e.g., a direction associated with a receiving device such as UE 115). In some examples, a beam direction associated with transmissions along a single beam direction may be determined based at least in part on 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 employ similar techniques to transmit signals multiple times in different directions (e.g., to identify a beam direction for subsequent transmissions or receptions by UE 115), or to transmit signals in a single direction (e.g., to transmit data to a receiving device).

[0044] A receiving device (e.g., UE 115, which may be an example of a mmW receiving device) may attempt multiple receive beams when receiving various signals from base station 105, such as synchronization signals, reference signals, beam selection signals, or other control signals. For example, the receiving device may attempt multiple receive directions by receiving via different antenna subarrays, by processing receive signals according to different antenna subarrays, by receiving according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, or by processing receive signals according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, any of which may be referred to as "listening" according to different receive beams or receive directions. In some examples, the receiving device may receive along a single beam direction using a single receive beam (e.g., when receiving a data signal). The single receive beam may be aligned in a beam direction determined based at least in part on listening according to different receive beam directions (e.g., based at least in part on determining the beam direction with the highest signal strength, highest signal-to-noise ratio, or other acceptable signal quality based on listening according to multiple beam directions).

[0045] In some cases, the antennas of a base station 105 or a UE 115 may be located within one or more antenna arrays that may support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some cases, the antennas or antenna arrays associated with a base station 105 may be located at different geographic locations. A base station 105 may have an antenna array with multiple rows and columns of antenna ports that the base station 105 may use to support beamforming for communications with a UE 115. Similarly, a UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations.

[0046] In some cases, the wireless communication system 100 can be a packet-based network operating according to a layered protocol stack. In the user plane, the communication of the bearer or packet data convergence protocol (PDCP) layer can be based on IP. The radio link control (RLC) layer can perform packet segmentation and reassembly to communicate through logical channels. The medium access control (MAC) layer can perform priority processing and multiplexing of logical channels to transport channels. The MAC layer can also use hybrid automatic repeat request (HARQ) to provide retransmission at the MAC layer to improve link efficiency. In the control plane, the radio resource control (RRC) protocol layer can provide the establishment, configuration and maintenance of the RRC connection between the UE 115 and the base station 105 or the core network 130, supporting the radio bearer for user plane data. At the physical layer, the transport channel can be mapped to the physical channel.

[0047] In some cases, UE 115 and base station 105 can support retransmission of data to increase the possibility of successfully receiving data. HARQ feedback is a technique to increase the possibility of correctly receiving data through communication link 125. HARQ can 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 the throughput of the MAC layer under poor radio conditions (e.g., signal-to-noise ratio conditions). In some cases, a wireless device can support same-slot HARQ feedback, where the device can provide HARQ feedback for data received in a previous symbol in the slot in a specific slot. In other cases, the device can provide HARQ feedback in a subsequent slot or according to some other time intervals.

[0048] The time interval in LTE or NR can be expressed as a multiple of the basic time unit. For example, the basic time unit can refer to T s =1 / 30,720,000 second sampling period. The time intervals of the communication resources may be organized according to radio frames each having a duration of 10 milliseconds (ms), where the frame period may be denoted as Tf =307,200T s . A radio frame may be identified by a system frame number (SFN) 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. A subframe may be further divided into 2 slots, each slot having a duration of 0.5 ms, and each 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 burst of a shortened TTI (TTI), or in a selected component carrier using an sTTI).

[0049] In some wireless communication systems, a time slot may be further divided into multiple mini-slots containing one or more symbols. In some cases, a mini-slot or a symbol of a mini-slot may be the smallest scheduling unit. For example, the duration of each symbol may be different depending on the subcarrier spacing or the operating frequency band. In addition, some wireless communication systems may implement time slot aggregation, where multiple time slots or mini-slots are aggregated together and used for communication between UE 115 and base station 105.

[0050] The term "carrier" refers to a collection of radio frequency spectrum resources with a defined physical layer structure for supporting communications on the communication link 125. For example, a carrier of the communication link 125 may include a portion of a radio frequency band that operates according to a physical layer channel of 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 raster for discovery by a UE 115. A carrier may be downlink or uplink (e.g., in FDD mode), or may be configured to carry downlink and uplink communications (e.g., in TDD mode). In some examples, a signal waveform transmitted by a carrier may be composed of multiple subcarriers (e.g., using a multi-carrier modulation (MCM) technique such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)).

[0051] The organization structure of the carrier may be different for different radio access technologies (e.g., LTE, LTE-A, LTE-A-Pro, NR). For example, communications on a carrier may be organized based on TTIs or time slots, where each TTI or time slot may include user data and control information or signaling to support decoding of the user data. The carrier may also include dedicated acquisition signaling (e.g., synchronization signals or system information, etc.) and control signaling to coordinate carrier operations. In some examples (e.g., in a carrier aggregation configuration), the carrier may also have acquisition signaling or control signaling to coordinate the operation of other carriers.

[0052] Physical channels may be multiplexed on a carrier according to various techniques. Physical control channels and physical data channels may be multiplexed on a downlink carrier, for example, using a time division multiplexing (TDM) technique, a frequency division multiplexing (FDM) technique, or a hybrid TDM-FDM technique. In some examples, control information sent in a physical control channel may be distributed in a cascaded manner between different control regions (e.g., between a common control region or common search space and one or more UE-specific control regions or UE-specific search spaces).

[0053] A carrier may be associated with a particular bandwidth of the radio spectrum, and in some examples, the carrier bandwidth may be referred to as the "system bandwidth" of the carrier or 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 serviced UE 115 may be configured to operate on part 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 a carrier (e.g., a set of subcarriers or a set of RBs) (e.g., an "in-band" deployment of a narrowband protocol type).

[0054] In a system using 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 is inversely proportional to the subcarrier spacing. 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 received by UE 115 and the higher the order of the modulation scheme, the higher the data rate of UE 115 may be. In a MIMO system, wireless communication resources may refer to a combination of radio spectrum resources, time resources, and space resources (e.g., space layers), and the use of multiple space layers may further increase the data rate of communication with UE 115.

[0055] A device (e.g., base station 105 or UE 115) of wireless communication system 100 may have a hardware configuration that supports communication on a specific carrier bandwidth, or may be configured to support communication on one of a set of carrier bandwidths. In some examples, wireless communication system 100 may include base stations 105 and / or UEs 115 that support simultaneous communication via carriers associated with more than one different carrier bandwidths.

[0056] The wireless communication system 100 may 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. Depending on the carrier aggregation configuration, the UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation may be used with both FDD and TDD component carriers.

[0057] In some cases, the wireless communication system 100 can utilize an enhanced component carrier (eCC). An eCC can be characterized by one or more characteristics, including a wider carrier or frequency channel bandwidth, a shorter symbol duration, a shorter TTI duration, or a modified control channel configuration. In some cases, an eCC can be associated with a carrier aggregation configuration or a dual connectivity configuration (e.g., when multiple serving cells have suboptimal or non-ideal backhaul links). An eCC can also be configured for use in an unlicensed spectrum or a shared spectrum (e.g., allowing more than one operator to use the spectrum). An eCC characterized by a wide carrier bandwidth can include one or more segments that can be used by UEs 115 that are unable to monitor the entire carrier bandwidth or are configured to use a limited carrier bandwidth (e.g., to save power).

[0058] In some cases, an eCC may use a different symbol duration than other component carriers, which may include using a reduced symbol duration compared to the symbol duration of other component carriers. A shorter symbol duration may be associated with an increased spacing between adjacent subcarriers. A device such as a UE 115 or a base station 105 utilizing an eCC may transmit a wideband signal (e.g., according to a frequency channel or carrier bandwidth of 20, 40, 60, 80 MHz, etc.) with a shortened symbol duration (e.g., 16.67 microseconds). A TTI in an eCC may consist of one or more symbol periods. In some cases, the TTI duration (i.e., the number of symbol periods in a TTI) may be variable.

[0059] The wireless communication system 100 may be an NR system that may utilize any combination of licensed, shared, and unlicensed bands, etc. The flexibility of eCC symbol duration and subcarrier spacing allows the use of eCC across multiple spectrums. In some examples, NR shared spectrum may improve spectrum utilization and spectrum efficiency, specifically through dynamic vertical (e.g., across frequency domain) and horizontal (e.g., across time domain) resource sharing.

[0060] The wireless communication system 100 may support access links (e.g., communication links 125) and side links (e.g., communication links 125-a) for communication between wireless devices. An access link may refer to any communication link 125 between a UE 115 and a base station 105, which may also be referred to as Uu. For example, an access link may support uplink signaling, downlink signaling, connection procedures, etc. A side link may refer to any communication link 125 between UEs 115. For example, a side link may support device-to-device (D2D) communication, vehicle-to-everything (V2X) and / or vehicle-to-vehicle (V2V) communication, message relay, discovery signaling, beacon signaling, or any combination of these or other signals transmitted over the air from one UE 115 to one or more other UEs 115.

[0061] In some cases, the NR system may use the sidelink 125-a for NR-V2X communications with a specific sidelink physical layer structure. For example, the configuration of the sidelink bandwidth part (BWP) may be separated from the Uu BWP configuration signaling. The same sidelink BWP may be used for transmission and reception. In addition, at a given time, the UE 115 may not expect to use different parameter sets in the configured sidelink BWP and active uplink BWP in the same carrier. For the time domain resources of the resource pool for PSSCH, the resource pool may consist of non-continuous time resources. For the frequency domain resources of the resource pool for PSSCH, the resource pool may consist of one or both of continuous PRBs or non-continuous PRBs.

[0062] The NR-V2X sidelink physical layer structure may allow CSI reporting to be enabled and disabled by configuration. In some cases, a subset of metrics for CSI reporting may be configured. At least sidelink CSI-RS for CQI / RI measurements for no more than two ports may be supported, and the sidelink CSI-RS may be restricted to PSSCH transmissions. In Mode 1 for unicast and multicast, the transmitter UE 115 may be supported to report an indication to the base station 105 via the Uu access link to indicate that a transport block sent by the transmitter UE 115 needs to be retransmitted.

[0063] The NR system may follow a CSI timeline such that when a downlink channel (e.g., a physical downlink control channel (PDCCH)) triggers an aperiodic CSI report, the UE 115 may have available computational resources to compute the report and sufficient time to perform the computation. The NR system may define some time requirements for aperiodic CSI reporting. The first requirement may be defined as the minimum number of OFDM symbols, Z, between the last symbol of the PDCCH that triggers the aperiodic CSI report and the first symbol of the PUSCH that carries the CSI report. During this period, the UE 115 should be able to decode the PDCCH, perform possible CSI-RS / IM measurements (if the most recent previous channel / interference measurements are not already stored in the memory of the UE 115), perform possible channel estimation, compute the CSI report, and perform uplink control information (UCI) multiplexing with the UL-SCH. However, if aperiodic CSI-RS / IM is used with the reporting, this first requirement alone may not guarantee that the UE 115 has sufficient time to compute the CSI, because the aperiodic CSI-RS may be triggered close to the PUSCH transmission. Therefore, the second requirement can be defined as the minimum number Z' of OFDM symbols between the last symbol used to calculate the reported aperiodic CSI-RS / IM and the first symbol of the PUSCH carrying the CSI report. The Z and Z' timing requirements may be different because the Z requirement may include DCI decoding time (e.g., some symbols) while Z' may not.

[0064] If Z or Z' is not implemented, and the base station 105 triggers PUSCH too close to the PDCCH (or aperiodic CSI-RS / IM), the UE 115 may ignore the scheduling DCI if the UE 115 is also not using UL-SCH or HARQ-ACK scheduling, and the UE 115 may not send anything. However, if UL-SCH or HARQ-ACK needs to be multiplexed on PUSCH, the UE 115 may still send PUSCH, but fill the CSI report with dummy bits, or send a stale CSI report.

[0065] Regarding the aperiodic reference signal (RS) timeline in NR, once the UE 115 receives a PDCCH with a DCI that explicitly triggers RS resources, the UE 115 can send the configured resources. The UE 115 can send resources in a later slot than the slot containing the PDCCH, depending on the configured slot offset. The slot offset for aperiodic RS can be a semi-statically configured value between 1 and 32 slots, where 1 represents the next slot after the slot in which the DCI trigger is received. In some cases, the slot offset can be configured at the resource set level. In addition, the minimum interval between DCI and RS can be a function of N2 (the minimum time between DCI and PUSCH), which can be based on the UE 115 capabilities.

[0066] In some wireless communication systems, the base station 105 may use DCI to aperiodically update its CSI on the sidelink between a first UE 115 (e.g., UE1) and one or more second UEs 115 (e.g., UE2) to trigger a CSI reporting process. The aperiodic CSI process may include the base station 105 sending a DCI containing a timing requirement to UE1 and optionally to UE2. The DCI containing the CSI request may be received and decoded at UE1. UE2 may receive the DCI from the base station 105 or UE1 and decode the CSI request. Based on the CSI request, UE1 may send an aperiodic reference signal (AP-RS) on the sidelink for UE2 to measure. After UE2 measures the AP-RS, UE2 may generate a CSI report and send it to UE1 on the sidelink. UE1 may then receive one or more CSI reports, decode the one or more CSI reports, and report them to the base station 105. UE1 may aggregate the decoded one or more CSI reports and send them to the base station 105 within a time period specified by the timing requirement received in the DCI. The timing requirement may be based on the capabilities of UE1.

[0067] Figure 2 An example of a wireless communication system 200 that supports timeline considerations for channel state information reporting for a sidelink channel in accordance with various aspects of the present disclosure is shown. In some examples, the wireless communication system 200 can implement various aspects of the wireless communication system 100. In some examples, the wireless communication system 200 can include a connected UE 115-a and sidelink UEs 115-b and 115-c, which can be reference Figure 1 The wireless communication system 200 may also include a base station 105-a, which may be a reference Figure 1 An example of a base station 105 is described.

[0068] The base station 105-a and the connected UE 115-a can communicate via access link Uu 205. The base station 105-a and the sidelink UEs 115-b and 115-c can communicate via access link Uu 215. For example, when the sidelink UEs 115-b and 115-c are in partial coverage mode with the base station 105-a, the base station 105-a can send downlink information to the UEs 115-b and 115-c, however, the UEs 115-b and 115-c may not be able to send uplink information to the base station 105-a. The connected UE 115-a can communicate with the sidelink UEs 115-b and 115-c via side link 210. In some examples, the base station 105-a can coordinate the sidelink communications between the UEs 115-a, 115-b, and 115-c. In some cases, one or more of the sidelink UEs 115 - b and 115 - c may be out of the coverage range of the base station 105 - a .

[0069] The wireless communication system 200 can perform non-periodic sidelink RS transmission and CSI reporting triggered by DCI from the base station 105-a. For example, the base station 105-a can send DCI containing timing requirements based on the minimum time required for the connected UE 115-a to aggregate received CSI reports and resend them to the base station 105-a via the access link 205. The DCI that may contain CSI requests can be received and decoded at the connected UE 115-a. The sidelink UEs 115-b and 115-c can receive DCI and decode CSI requests from the base station 105-a or the connected UE 115-a. For example, if the sidelink UE 115-b is in partial coverage mode relative to the base station 105-a, the sidelink UE 115-b can receive DCI from the base station 105-a; however, if the sidelink UE 115-c is beyond the coverage of the base station 105-a, the sidelink UE 115-c can receive DCI from the connected UE 115-a.

[0070] In some cases, a common DCI may be sent from base station 105-a to UEs 115-a, 115-b, and 115-c. Alternatively, separate DCIs (e.g., UE-specific DCIs) may be sent from base station 105-a to each of UEs 115-a, 115-b, and 115-c. When separate DCIs trigger AP-RS transmissions by connected UE 115-a and AP-RS measurements and CSI reporting by sidelink UEs 115-b and 115-c, the DCI triggering CSI reporting by sidelink UEs 115-b and 115-c should be in the same time slot as (or earlier than) the time slot containing the AP-RS for connected UE 115-a. When the same DCI is sent to the connected UE 115-a and the sidelink UEs 115-b and 115-c, the DCI can trigger the AP-RS of the connected UE 115-a, the CSI report of UE1 associated with the PUSCH (or PSSCH) configuration, and the CSI report of the sidelink UEs 115-b and 115-c with the PSSCH configuration.

[0071] Based on the CSI request, the connected UE 115-a may transmit an aperiodic reference signal (AP-RS) on the sidelink 210 for the sidelink UEs 115-b and 115-c to measure. After the sidelink UEs 115-b and 115-c measure the AP-RS, they may generate a CSI report and transmit it to the connected UE 115-a on the sidelink 210. The connected UE 115-a may then receive one or more CSI reports, decode one or more CSI reports, and report an aggregated CSI report 220 to the base station 105 on the access link 205. The connected UE 115-a may aggregate the decoded one or more CSI reports and transmit them to the base station 105 within a time period specified due to timing requirements received in the DCI. In some cases, the DCI received from the base station 105-a may indicate to the connected UE 115-a how to aggregate the CSI reports. A timing requirement Z' may be defined with respect to transmission of RS by connected UE 115-a, while a different timing requirement Z may be defined with respect to reception of DCI received by sidelink UEs 115-b and 115-c. The timing requirements may be based on the capabilities of connected UE 115-A.

[0072] More specifically, Z can be defined as the minimum number of OFDM symbols between the last symbol of the PDCCH carrying the DCI that triggers the non-periodic CSI report and the first symbol of the PUSCH carrying the CSI report, and at this time, the connected UE115-a should be able to decode the DCI, perform possible CSI-RS / IM measurements, perform possible channel estimation, calculate the CSI report, and perform UCI multiplexing with the UL-SCH. Z' can be similar to Z, but does not include the DCI decoding time. In the traditional timeline, the sidelink is not considered, and therefore, no timing requirements are defined for the connected UE 115-a to decode and aggregate the CSI reports received from the sidelink UEs 115-b and 115-c, and then send the aggregated reports to the base station 105-a.

[0073] In order to manage the existing non-periodic CSI timeline when measuring the sidelink channel, the base station 105-a can determine a new minimum time requirement Z". This new time period corresponds to the time required for the connected UE 115-a to aggregate and send the sidelink CSI report. Z" can be after the connected UE 115-a has received the CSI report from the sidelink UE 115-b or 115-c. This minimum time requirement Z" can be based on the capabilities of the connected UE 115-a (e.g., processing capabilities). If the timing requirement (or multiple) indicated in the DCI is shorter than the minimum time, the UE 115-a, 115-b and 115-c can perform the CSI process, and then the connected UE 115-a can discard the aggregated CSI report, can use a previous stale aggregated CSI report, or can insert a dummy aggregated CSI report. This can avoid unnecessary power consumption caused by the UE 115-a, 115-b and 115-c attempting the CSI reporting process and not being able to prepare the aggregated CSI report within the specified time requirement.

[0074] In some cases, another time window may be configured for connected UE 115-a that defines a time during which connected UE 115-a should attempt to receive CSI reports from sidelink UEs 115-b and 115-c before discarding those CSI reports that were not received. For example, it is expected that all CSI reports will be received within a specified or configured time window, which may be defined relative to the transmission of an AP-RS or the first reception of a CSI report. For example, if connected UE 115-a transmits an AP-RS to sidelink UEs 115-b and 115-c, and sidelink UE 115-b reports a CSI report within a time window (e.g., X time slots), but sidelink UE 115-c does not report, then an updated CSI report for sidelink UE 115-b may be sent to base station 105-a by connected UE 115-b, but an updated CSI report for sidelink UE 115-c will not be sent to base station 105-a. Conversely, connected UE 115-a may discard the CSI report corresponding to sidelink UE 115-c, may use a previous stale CSI report, or may insert a dummy report. This may avoid delays caused by waiting for CSI reports from sidelink UEs 115-b and 115-c that were not received within a time window. In this example, a minimum timing requirement Z" may be defined as the minimum time to transmit an aggregated CSI report (e.g., on a physical uplink shared channel (PUSCH) or a physical uplink control channel (PUCCH)) for receiving the latest report from sidelink UE 115-b or 115-c within a receive time window.

[0075] For the situation when one or more sidelink UEs 115-b and 115-c are out of coverage of base station 105-a, one or more DCIs (e.g., DCIs in PSCCH) from connected UE 115-a to sidelink UEs 115-b and 115-c on sidelink 210 may be used to trigger AP-RS measurements and CSI reporting. In some examples, each DCI triggers a CSI report in a corresponding resource pool. For time domain resources of a resource pool for PSSCH, the resource pool may consist of non-contiguous time resources. For frequency domain resources of a resource pool for PSSCH, the resource pool may consist of one or both of contiguous PRBs or non-contiguous PRBs. If there are multiple resource pools, the connected UE 115-a may send an AP-RS for each resource pool.

[0076] Figure 3 An example of a process flow 300 is shown to support timeline considerations for channel state information reporting for a sidelink channel in accordance with various aspects of the present disclosure. In some examples, the process flow 300 can implement aspects of the wireless communication system 100. As shown in FIG. Figure 1As described, process flow 300 may be implemented by base station 105-b and UEs 115-d and 115-e, which may be examples of base station 105 and UE 115, respectively. The following optional examples may be implemented, in which some steps are performed in a different order than described, or not performed at all. In some cases, the steps may include additional features not mentioned below, or further steps may be added.

[0077] At 305, UE 115-d may optionally send, and base station 105-b may optionally receive, a capability report including UE timing capabilities.

[0078] At 310 , the base station 105 - b may determine a CSI reporting timing configuration based at least in part on the capabilities of the UE 115 - d .

[0079] At 315 , the base station 105 - b may send, and the UE 115 - d may receive, a first DCI including a CSI timing configuration and a trigger of an AP-RS, which may be based at least in part on the capability report optionally sent at 305 .

[0080] At 320, the base station 105-b may send, and the UE 115-e may receive, downlink control information including a CSI reporting timing configuration and a trigger for measuring an aperiodic reference signal. In some cases, the DCI sent at 315 and 320 is the same (e.g., a common DCI), or the DCI sent at 315 and 320 is different (e.g., a UE-specific DCI).

[0081] At 325 , UE 115 - d may identify an AP-RS trigger in the received DCI.

[0082] At 330, UE 115-d may transmit and UE 115-e may receive AP-RS on the sidelink channel based at least in part on the trigger received in the first and / or second DCI. In some cases, the DCI and AP-RS are located in the same time slot, or the DCI is located in the first time slot that occurs before a subsequent time slot that includes the AP-RS.

[0083] At 335, UE 115-d may optionally initiate a receive time window, which may be semi-statically configured by base station 105-b.

[0084] At 340 , the UE 115 - e may generate a CSI report before the CSI reporting timing configuration expires.

[0085] At 345 , UE 115 - e may send and UE 115 - d may receive a CSI report before the CSI reporting timing configuration expires.

[0086] At 350, UE 115-d may optionally end the receive time window.

[0087] At 355, UE 115-d may optionally avoid updating one or more CSI reports, which may include discarding one or more CSI reports received after termination of receive time window 350. Additionally or alternatively, avoiding may include sending a spurious aggregated CSI report to base station 105-b on an uplink channel before termination of the CSI report timing configuration for one or more CSI reports received after termination of the receive time window.

[0088] The UE 115-d may aggregate the received CSI reports at 360. For example, the UE 115-d may aggregate the CSI reports received within a reception time window.

[0089] At 365, UE 115-d may send, and base station 105-b may receive, an aggregated CSI report of a sidelink channel between UE 115-d and at least UE 115-e, that was received on an uplink channel before termination of the CSI report timing configuration. In some cases, when the CSI report timing configuration is shorter than the reported UE timing capability, the aggregated CSI report may include one or more spurious CSI reports. In some cases, the CSI report timing configuration defines a time period during which UE 115d sends the aggregated CSI report at 365 relative to a time at which UE 115d receives one or more CSI reports at 345. In another example, the CSI report timing configuration defines a time period during which UE 115-d sends the aggregated CSI report at 365 relative to a time at which UE 115-d receives DCI at 315.

[0090] Figure 4 An example of a process flow 400 is shown that supports timeline considerations for channel state information reporting for a sidelink channel in accordance with various aspects of the present disclosure. In some examples, the process flow 400 can implement various aspects of the wireless communication system 100. As shown in FIG. Figure 1 As described, process flow 400 may be implemented by base station 105-c and UEs 115-f and 115-g, which may be examples of base station 105 and UE 115, respectively. The following optional examples may be implemented, in which some steps are performed in a different order than described, or not performed at all. In some cases, the steps may include additional features not mentioned below, or further steps may be added.

[0091] At 405, the base station 105-c may determine that one or more UEs 115-g are out of coverage of the base station.

[0092] At 410 , based at least in part on the UE 115 - g being outside of coverage of the base station as determined at 405 , the base station 105 - c may send, and the UE 115 - f may receive, an indication to send DCI to the UE 115 - g .

[0093] At 415, UE 115-f may optionally send, and base station 105-c may optionally receive, a capability report including UE timing capabilities.

[0094] At 420, base station 105-c may determine a CSI reporting timing configuration based at least in part on the capabilities of UE 115-f and / or at least the capabilities of UE 115-g.

[0095] At 425 , the base station 105 - c may send, and the UE 115 - f may receive, a first DCI including a CSI timing configuration and a trigger of an AP-RS, which may be based at least in part on the capability report optionally sent at 415 .

[0096] At 430 , UE 115 - f may send, and UE 115 - g may receive, a second DCI including the CSI reporting timing configuration and a trigger to measure the aperiodic reference signal.

[0097] At 435 , UE 115 - f may identify an AP-RS trigger in the received DCI.

[0098] At 440, based at least in part on the trigger received in the first DCI, UE 115-f may transmit and UE 115-g may receive AP-RS on the sidelink channel. In some cases, the first DCI and the AP-RS are located in the same time slot, or the first DCI is located in a first time slot that occurs before a second time slot that includes the AP-RS.

[0099] At 445, the UE 115-f may optionally initiate a receive time window, which may be semi-statically configured by the base station 105-c.

[0100] At 450 , the UE 115 - g may generate a CSI report before the CSI reporting timing configuration expires.

[0101] At 455 , UE 115 - g may send and UE 115 - f may receive CSI reports before the CSI reporting timing configuration expires.

[0102] At 460, UE 115-f may optionally end the receive time window.

[0103] At 465, the UE 115-f may optionally avoid updating one or more CSI reports, which may include discarding one or more CSI reports received after the reception time window 460 expires. Additionally or alternatively, avoiding may include sending a spurious aggregated CSI report to the base station 105-c on an uplink channel before the CSI report timing configuration expires for the one or more CSI reports received after the reception time window expires.

[0104] The UE 115-f may aggregate the received CSI reports at 470. For example, the UE 115-f may aggregate the CSI reports received within a reception time window.

[0105] At 475, UE 115-f may send, and base station 105-c may receive, an aggregated CSI report of a sidelink channel between UE 115-f and at least UE 115-g that was received on an uplink channel before the CSI report timing configuration terminated. In some cases, when the CSI report timing configuration is shorter than the reported UE timing capability, the aggregated CSI report may include one or more spurious CSI reports.

[0106] In some cases, the CSI reporting timing configuration defines a time period during which the UE 115-f sends an aggregated CSI report at 475 relative to a time at which the UE 115-f receives one or more CSI reports at 455. In another example, the CSI reporting timing configuration defines a time period during which the UE 115-f sends an aggregated CSI report at 475 relative to a time at which the UE 115-f receives a DCI at 425.

[0107] Figure 5 An example of an architecture 500 is shown that supports timeline considerations for channel state information reporting for a sidelink channel in accordance with various aspects of the present disclosure. In some examples, the architecture 500 can implement various aspects of wireless communication systems 100 and / or 200. In some cases, as described herein, the architecture 500 can be an example of a transmitting device (e.g., a first wireless device such as UE 115 or base station 105) and / or a receiving device (e.g., a second wireless device such as UE 115 or base station 105).

[0108] Figure 5Example hardware components of a wireless device according to one or more aspects of the present disclosure are shown. The components shown may include components that can be used for antenna element selection and / or beamforming for wireless signal transmission. There are many architectures for antenna element selection and implementing phase shifting, and only one of them is illustrated here. Architecture 500 includes a modem (modulator / demodulator) 502, a digital-to-analog converter (DAC) 504, a first mixer 506, a second mixer 508, and a splitter 510. Architecture 500 also includes a plurality of first amplifiers 512, a plurality of phase shifters 514, a plurality of second amplifiers 516, and an antenna array 518 including a plurality of antenna elements 520. Transmission lines or other waveguides, wires, traces, etc. connecting various components are shown to illustrate how the signals to be sent are transmitted between components. Boxes 522, 524, 526, and 528 indicate areas in which different types of signals travel or are processed in architecture 500. Specifically, box 522 represents the area where digital baseband signals travel or are processed, box 524 represents the area where analog baseband signals travel or are processed, box 526 represents the area where analog intermediate frequency (IF) signals travel or are processed, and box 528 indicates the area where analog radio frequency (RF) signals travel or are processed. The architecture also includes local oscillator A 530, local oscillator B 532, and a communication manager 534.

[0109] Each of the antenna elements 520 may include one or more sub-elements (not shown) for radiating or receiving RF signals. For example, a single antenna element 520 may include a first sub-element that is cross-polarized with a second sub-element that can be used to independently transmit a cross-polarized signal. The antenna elements 520 may include patch antennas or other types of antennas arranged in a linear, two-dimensional, or other pattern. The spacing between the antenna elements 520 may be such that signals having a desired wavelength transmitted individually by the antenna elements 520 may interact or interfere (e.g., form a desired beam). For example, given an expected wavelength or frequency range, the spacing may provide a quarter wavelength, half wavelength, or other portion of the spacing wavelength between adjacent antenna elements 520 to allow interaction or interference of signals transmitted by separate antenna elements 520 within the expected range.

[0110] The modem 502 processes and generates a digital baseband signal, and may also control the operation of the DAC 504, the first mixer 506 and the second mixer 508, the splitter 510, the first amplifier 512, the phase shifter 514 and / or the second amplifier 516 to transmit the signal via one or more or all of the antenna elements 520. The modem 502 may process the signal and control the operation according to a communication standard such as the wireless standard discussed herein. The DAC 504 may convert the digital baseband signal received from the modem 502 (and the digital baseband signal to be transmitted) into an analog baseband signal. The first mixer 506 uses the local oscillator A 530 to convert the analog baseband signal within the IF into an analog IF signal. For example, the first mixer 506 may mix the signal with the oscillation signal generated by the local oscillator A 530 to "move" the baseband analog signal to the IF. In some cases, some processing or filtering (not shown) may be performed at the IF. The second mixer 508 uses the local oscillator B 532 to convert the analog IF signal into an analog RF signal. Similar to the first mixer, the second mixer 508 can mix the signal with the oscillating signal generated by the local oscillator B 532 to "move" the IF analog signal to the RF, or frequency at which the signal will be transmitted or received. The modem 502 and / or the communication manager 534 can adjust the frequency of the local oscillator A 530 and / or the local oscillator B 532 to generate and use the desired IF and / or RF frequencies to facilitate processing and transmission of signals within the desired bandwidth.

[0111] In the illustrated architecture 500, the signal converted by the second mixer 508 is split or replicated into multiple signals by the splitter 510. The splitter 510 in the architecture 500 splits the RF signal into multiple identical or nearly identical RF signals, as shown by the presence of the block 528. In other examples, any type of signal including baseband digital, baseband analog or IF analog signals can be used for splitting. Each of these signals can correspond to an antenna element 520, and the signal travels through and is processed by the amplifier 512, 516, phase shifter 514 and / or other elements corresponding to the corresponding antenna element 520 to be provided to and transmitted by the corresponding antenna element 520 of the antenna array 518. In one example, the splitter 510 can be an active splitter that is connected to a power source and provides some gain so that the RF signal leaving the splitter 510 is at a power level equal to or greater than the signal entering the splitter 510. In another example, the splitter 510 is a passive splitter that is not connected to a power source, and the RF signal exiting the splitter 510 may be at a lower power level than the RF signal entering the splitter 510 .

[0112] After being split by the splitter 510, the resulting RF signal can enter an amplifier, such as a first amplifier 512, or a phase shifter 514 corresponding to the antenna element 520. The first amplifier 512 and the second amplifier 516 are shown with dashed lines because one or both of them may not be needed in some implementations. In one implementation, both the first amplifier 512 and the second amplifier 514 exist. In another case, neither the first amplifier 512 nor the second amplifier 514 exists. In other implementations, one of the two amplifiers 512, 514 exists, but the other does not. For example, if the splitter 510 is an active splitter, the first amplifier 512 may not be used. As a further example, if the phase shifter 514 is an active phase shifter capable of providing gain, the second amplifier 516 may not be used.

[0113] The amplifiers 512, 516 can provide a desired level of positive gain or negative gain. Positive gain (positive dB) can be used to increase the amplitude of the radiated signal of a particular antenna element 520. Negative gain (negative dB) can be used to reduce the amplitude and / or avoid signal radiation of a particular antenna element. Each of the amplifiers 512, 516 can be independently controlled (e.g., by the modem 502 or the communication manager 534) to provide independent control of the gain of each antenna element 520. For example, the modem 502 and / or the communication manager 534 can have at least one control line connected to each of the splitter 510, the first amplifier 512, the phase shifter 514, and / or the second amplifier 516, which can be used to configure the gain to provide a desired amount of gain for each component and therefore for each antenna element 520.

[0114] The phase shifter 514 can provide a configurable phase shift or phase offset to the corresponding RF signal to be transmitted. The phase shifter 514 can be a passive phase shifter that is not directly connected to the power supply. The passive phase shifter may introduce some insertion loss. The second amplifier 516 can enhance the signal to compensate for the insertion loss. The phase shifter 514 can be an active phase shifter connected to the power supply so that the active phase shifter provides a certain amount of gain or prevents insertion loss. The setting of each phase shifter 514 is independent, which means that each can be set to provide a desired phase shift amount or the same phase shift amount or some other configuration. The modem 502 and / or the communication manager 534 can have at least one control line connected to each phase shifter 514, and it can be used to configure the phase shifter 514 to provide a desired amount of phase shift or phase offset between the antenna elements 520.

[0115] In the illustrated architecture 500, the RF signal received by the antenna element 520 is provided to one or more of the first amplifiers 556 to enhance the signal strength. The first amplifier 556 can be connected to the same antenna array 518, for example, for TDD operation. The first amplifier 556 can be connected to different antenna arrays 518. The enhanced RF signal is input to one or more of the phase shifters 554 to provide a configurable phase shift or phase offset for the corresponding received RF signal. The phase shifter 554 can be an active phase shifter or a passive phase shifter. The settings of the phase shifter 554 are independent, which means that each can be set to provide a desired phase shift amount or the same phase shift amount or some other configuration. The modem 502 and / or the communication manager 534 can have at least one control line connected to each phase shifter 554, and it can be used to configure the phase shifter 554 to provide a desired amount of phase shift or phase offset between the antenna elements 520.

[0116] The output of phase shifter 554 can be input to one or more second amplifiers 552 for phase shifting and signal amplification of received RF signals. Second amplifier 552 can be configured individually to provide a configured gain amount. Second amplifier 552 can be configured individually to provide a certain amount of gain to ensure that the signals input to combiner 550 have the same amplitude. Amplifiers 552 and / or 556 are shown in dotted lines because they may not be needed in some implementations. In one implementation, amplifier 552 and amplifier 556 both exist. In another case, amplifier 552 and amplifier 556 do not exist. In other implementations, one of amplifiers 552 and 556 exists, but the other does not exist.

[0117] In the illustrated architecture 500, the signals output by the phase shifter 554 (via the amplifier 552 when present) are combined in the combiner 550. The combiner 550 in the architecture combines the RF signals into a signal, as shown by the presence in the block 528. The combiner 550 can be a passive combiner, for example, not connected to a power source, which may result in some insertion loss. The combiner 550 can be an active combiner, for example, connected to a power source, which may result in some signal gain. When the combiner 550 is an active combiner, it can provide a different (e.g., configurable) amount of gain for each input signal so that the input signals have the same amplitude when the input signals are combined. When the combiner 550 is an active combiner, it may not need a second amplifier 552, because the active combiner can provide signal amplification.

[0118] The output of combiner 550 is input to mixers 548 and 546. Mixers 548 and 546 typically down-convert received RF signals using inputs from local oscillators 572 and 570, respectively, to create intermediate or baseband signals that carry coding and modulation information. The outputs of mixers 548 and 546 are input to analog-to-digital converter (ADC) 544 for conversion to analog signals. The analog signals output from ADC 544 are input to modem 502 for baseband processing, such as decoding, deinterleaving, etc.

[0119] Architecture 500 is given by way of example to illustrate an architecture for sending and / or receiving signals. It should be understood that architecture 500 and / or each part of architecture 500 can be repeated multiple times within the architecture to accommodate or provide any number of RF chains, antenna elements and / or antenna panels. In addition, many alternative architectures are possible and conceivable. For example, although a single antenna array 518 is shown, two, three or more antenna arrays may be included, each with one or more of their own corresponding amplifiers, phase shifters, splitters, mixers, DACs, ADCs and / or modems. For example, a single UE 115 may include two, four or more antenna arrays for sending or receiving signals at different physical locations on UE 115 or in different directions.

[0120] In addition, mixers, splitters, amplifiers, phase shifters, and other components may be located in different signal type areas (e.g., different areas in blocks 522, 524, 526, 528) in different implementation architectures. For example, in different examples, the signal to be transmitted may be split into multiple signals at analog RF, analog IF, analog baseband, or digital baseband frequencies. Similarly, amplification and / or phase shifting may also occur at different frequencies. For example, in some contemplated implementations, one or more of splitters 510, amplifiers 512, 516, or phase shifters 514 may be located between DAC 504 and first mixer 506 or between first mixer 506 and second mixer 508. In one example, the functions of one or more components may be combined into one component. For example, phase shifter 514 may perform amplification to include or replace first amplifier 512 and / or second amplifier 516. As another example, phase shifting may be implemented by second mixer 508 to avoid the need for a separate phase shifter 514. This technique is sometimes referred to as local oscillator (LO) phase shifting. In one implementation of this configuration, there may be multiple IF to RF mixers within the second mixer 508 (eg, for each antenna element chain), and local oscillator B 532 will provide a different local oscillator signal (with a different phase offset) to each IF to RF mixer.

[0121] The modem 502 and / or the communication manager 534 can control one or more other components 504-572 to select one or more antenna elements 520 and / or form a beam for transmitting one or more signals. For example, the antenna elements 520 can be individually selected or deselected to transmit a signal (one or more signals) by controlling the amplitude of one or more corresponding amplifiers (such as the first amplifier 512 and / or the second amplifier 516). Beamforming includes generating a beam using multiple signals on different antenna elements, wherein one or more or all of the multiple signals are phase-shifted from each other. The formed beam may carry a physical or higher-level reference signal or information. When each of the multiple signals is radiated from the corresponding antenna element 520, the radiated signals interact, interfere (constructively and destructively interfere) and amplify each other to form the resulting beam. The shape (such as the amplitude, width and / or the presence of side lobes) and direction (such as the angle of the beam relative to the surface of the antenna array 518) can be dynamically controlled by modifying the phase shift or phase offset applied by the phase shifter 514 and the amplitude of the multiple signals applied by the amplifiers 512, 516 relative to each other.

[0122] In some examples, when the architecture 500 is configured as a receiving device, the communication manager 534 may receive a first DCI including a first timing configuration and a trigger of an aperiodic reference signal from a base station. The communication manager 534 may send an AP-RS to at least a second UE on a sidelink channel based at least in part on the trigger received in the first DCI, and may receive one or more CSI reports from at least the second UE, the reports including CSI parameters obtained based at least in part on measurements of the aperiodic reference signal. The communication manager 534 may aggregate one or more channel state information reports during the first timing configuration. The communication manager 534 may also send an aggregated channel state information report on an uplink channel to the base station before the first timing configuration terminates.

[0123] In another example, the communication manager 534 may send a capability report including UE timing capabilities to the base station, and may receive first downlink control information including a first timing configuration and a trigger for measuring AP-R from the base station. Additionally or alternatively, the communication manager 534 may receive an AP-RS on a first sidelink channel from a second UE based at least in part on the received first DCI, and may send a CSI report to the second UE on a second sidelink channel before the first timing configuration terminates.

[0124] In yet another example, the communication manager 534 may receive a first DCI including a first timing configuration and a trigger for measuring an aperiodic reference signal from a second UE on a first side link channel, and may receive an AP-RS from the second UE on a second side link channel based at least in part on the received first DCI. Thus, the communication manager 534 may send a CSI report to the second UE on a third side link channel before the first timing configuration terminates.

[0125] Additionally or alternatively, when the architecture 500 is configured as a transmitting device, the communication manager 534 may receive a capability report including UE timing capabilities from the first UE. The communication manager 534 may also send a first DCI including a first timing configuration and a trigger of an AP-RS to the first UE based at least in part on the capability report. In some cases, the communication manager 534 may receive from the first UE an aggregated CSI report of a sidelink channel between the first UE and at least a second UE, the aggregated CSI report being received before the first timing configuration is terminated.

[0126] The communications manager 534 may be partially or fully located within one or more other components of the architecture 500. For example, in at least one implementation, the communications manager 534 may be located within the modem 502.

[0127] Figure 6 A block diagram 600 of a device 605 is shown that supports timeline considerations for channel state information reporting of a sidelink channel in accordance with various aspects of the present disclosure. The device 605 may be an example of various aspects of a UE 115 as described herein. The device 605 may include a receiver 610, a communication manager 615, and a transmitter 620. The device 605 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0128] The receiver 610 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to timeline considerations for channel state information reports of sidelink channels, etc.). The information may be passed to other components of the device 605. The receiver 610 may be a reference Fig. 9 Examples of various aspects of the transceiver 920 are described. The receiver 610 may utilize a single antenna or a collection of antennas.

[0129] The communication manager 615 can be implemented at the first UE and can receive first downlink control information including a first timing configuration and a trigger of a non-periodic reference signal from the base station, and based on the trigger received in the first downlink control information, send a non-periodic reference signal to at least a second UE on a sidelink channel, receive one or more channel state information reports including channel state information parameters measured based on the non-periodic reference signal from at least the second UE, aggregate one or more channel state information reports during the first timing configuration, and send the aggregated channel state information report to the base station on an uplink channel before the first timing configuration is terminated.

[0130] Additionally or alternatively, the communication manager 615 may be implemented at a sidelink UE and may send a capability report including UE timing capabilities to a base station, receive a first timing configuration from the base station, receive first downlink control information from the base station including a trigger for measuring a non-periodic reference signal based on the first timing configuration, receive a non-periodic reference signal from a second UE on a first sidelink channel based on the received first downlink control information, and send a channel state information report to the second UE on a second sidelink channel before the first timing configuration is terminated.

[0131] Additionally or alternatively, the communication manager 615 may be implemented at a sidelink UE and may receive a first timing configuration from a second UE on a first sidelink channel, receive first control information (e.g., DCI or sidelink control information) including a trigger to measure an aperiodic reference signal based on the first timing configuration from the second UE on the first sidelink channel, receive an aperiodic reference signal from the second UE on a second sidelink channel based on the received first control information, and send a report channel state information to the second UE on a third sidelink channel before the first timing configuration terminates. The communication manager 615 may be an example of various aspects of the communication manager 910 described herein.

[0132] The actions performed by the communication manager 615 as described herein may be implemented to achieve one or more potential advantages. For example, sending an aggregated channel state information report to the base station 105 on an uplink channel prior to termination of the first timing configuration may allow the UE 115 to coordinate the sidelink AP-RS and CSI transmission scheduling of one or more sidelink UEs. This may improve CSI reception reliability at the UE 115 and the base station 105, as the timing requirements may indicate an appropriate CSI reporting timeline that reduces or avoids excessive power consumption by taking into account the processing capabilities of the UE 115. In addition, a UE 115 configured with a receive time window may avoid delays caused by the UE 115 waiting for a CSI report from a sidelink UE that was not received within the time window. This supports more efficient reporting at the UE 115.

[0133] Based on the transmission timing requirements, a processor controlling the receiver 610, the communication manager 615, the transmitter 620, etc. of the first UE 115 (e.g., the connected UE 115) can reduce processing resources used for sidelink reception. Therefore, the first UE 115 can reduce the occurrence of unsuccessful CSI processing performed without a configured timeline. Reducing the number of CSI processing can reduce the number of times the processor increases processing power and switches on processing units to process sidelink AP-RS transmissions and CSI report reception and decoding.

[0134] The communication manager 615 or its subcomponents may be implemented by hardware, code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 615 or its subcomponents may be performed by a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein.

[0135] The communication manager 615 or its subcomponents can be physically located in various locations, including being distributed so that portions of the functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present invention, the communication manager 615 or its subcomponents can be separate and distinct components. In some examples, the communication manager 615 or its subcomponents can 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 the present invention, or a combination according to various aspects of the present invention.

[0136] Transmitter 620 can transmit signals generated by other components of device 605. In some examples, transmitter 620 can be collocated with receiver 610 in a transceiver module. For example, transmitter 620 can be a reference Fig. 9 Examples of various aspects of the described transceiver 920. The transmitter 620 may utilize a single antenna or a collection of antennas.

[0137] Figure 7 A block diagram 700 of a device 705 supporting timeline considerations for channel state information reporting of a sidelink channel according to various aspects of the present disclosure is shown. The device 705 may be an example of various aspects of the device 605 or UE 115 as described herein. The device 705 may include a receiver 710, a communication manager 715, and a transmitter 745. The device 705 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0138] The receiver 710 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to timeline considerations for channel state information reporting for sidelink channels, etc.). The information may be passed to other components of the device 705. The receiver 710 may be a reference Fig. 9 Examples of various aspects of the transceiver 920 are described. The receiver 710 may utilize a single antenna or a collection of antennas.

[0139] The communication manager 715 may be an example of various aspects of the communication manager 615 as described herein. The communication manager 715 may include a timing configuration manager 720, an AP-RS component 725, a sidelink CSI report receiver 730, an aggregator 735, and a sidelink CSI report manager 740. The communication manager 715 may be an example of various aspects of the communication manager 910 described herein.

[0140] The timing configuration manager 720 may receive a first timing configuration and first control information including a trigger for measuring an aperiodic reference signal from a base station. The timing configuration manager 720 may receive a first timing configuration and first control information including a trigger for measuring an aperiodic reference signal from a base station. The timing configuration manager 720 may receive a first timing configuration and first control information including a trigger for measuring an aperiodic reference signal from a second UE on a first sidelink channel.

[0141] The AP-RS component 725 may transmit an aperiodic reference signal to at least the second UE on a sidelink channel based on a trigger received in the first control information. The AP-RS component 725 may receive an aperiodic reference signal from the second UE on a first sidelink channel based on the received first control information.

[0142] The sidelink CSI report receiver 730 may receive one or more channel state information reports including measured channel state information parameters based on the aperiodic reference signal from at least the second UE.

[0143] Aggregator 735 may aggregate one or more channel state information reports during the first timing configuration.Sidelink CSI reporting manager 740 may send the aggregated channel state information report to the base station on an uplink channel before the first timing configuration terminates.

[0144] Transmitter 745 can transmit signals generated by other components of device 705. In some examples, transmitter 745 can be collocated with receiver 710 in a transceiver module. For example, transmitter 745 can be a reference Fig. 9 Examples of various aspects of the transceiver 920 are described. The transmitter 745 can utilize a single antenna or a collection of antennas.

[0145] Figure 8 A block diagram 800 of a communication manager 805 is shown that supports timeline considerations for channel state information reporting of a sidelink channel in accordance with various aspects of the present disclosure. The communication manager 805 can be an example of various aspects of the communication manager 615, the communication manager 715, or the communication manager 910 described herein. The communication manager 805 can include a timing configuration manager 810, an AP-RS component 815, a sidelink CSI report receiver 820, an aggregator 825, a sidelink CSI report manager 830, a capability reporting component 835, a receive window timer 840, a DCI component 845, and a sidelink CSI report transmitter 850. Each of these modules can communicate with each other directly or indirectly (e.g., via one or more buses).

[0146] The timing configuration manager 810 may receive a first timing configuration and first downlink control information including a trigger for measuring an aperiodic reference signal from a base station. In some examples, the timing configuration manager 810 may receive a first downlink control information including a first timing configuration and a trigger for measuring an aperiodic reference signal from a base station. In some examples, the timing configuration manager 810 may receive a first timing configuration and first control information including a trigger for measuring an aperiodic reference signal from a second UE on a first sidelink channel.

[0147] In some cases, the first timing configuration defines a time period for the first UE to send an aggregated CSI report relative to when the first UE receives one or more CSI reports. In some cases, the first timing configuration defines a time period for the first UE to send an aggregated CSI report relative to when the first UE receives the first DCI. In some cases, the first timing configuration defines a time period for the second UE to send an aggregated CSI report to the base station relative to when the second UE receives the CSI report. In some cases, the first DCI triggers sending a CSI report from the set of UEs to the second UE.

[0148] The AP-RS component 815 may transmit an aperiodic reference signal to at least a second UE on a side link channel based on a trigger received in the first control information. In some examples, the AP-RS component 815 may receive an aperiodic reference signal from a second UE on a first or second side link channel based on the received first control information. In some cases, the first DCI and the AP-RS are located in the same time slot, or the first DCI is located in a first time slot that occurs before a second time slot that includes the AP-RS.

[0149] The sidelink CSI report receiver 820 may receive one or more channel state information reports including measured channel state information parameters based on the aperiodic reference signal from at least the second UE. The aggregator 825 may aggregate the one or more channel state information reports during the first timing configuration.

[0150] The sidelink CSI reporting manager 830 may send an aggregated channel state information report to the base station on an uplink channel before the first timing configuration terminates. In some examples, when the first timing configuration is shorter than the reported UE timing capability, the sidelink CSI reporting manager 830 may avoid sending the aggregated CSI report. In some examples, when the first timing configuration is shorter than the reported UE timing capability, the sidelink CSI reporting manager 830 may send one or more spurious aggregated CSI reports to the base station on an uplink channel before the first timing configuration terminates. In some examples, when the first timing configuration is shorter than the reported UE timing capability, the sidelink CSI reporting manager 830 may discard the aggregated CSI report.

[0151] In some cases, the sidelink includes PSSCH and the uplink channel includes PSSCH, PUSCH, PUCCH, or PSFCH.In some cases, the first sidelink channel includes PSSCH and the second sidelink channel includes PSSCH or PSFCH.

[0152] Capability reporting component 835 can send a capability report including UE timing capabilities to the base station.In some cases, the first timing configuration is based on capabilities of the first UE and / or capabilities of the second UE.

[0153] The receive window timer 840 may receive one or more CSI reports within a receive time window based on the received first DCI. In some examples, the receive window timer 840 may aggregate one or more CSI reports received within the receive time window. In some examples, the receive window timer 840 may discard one or more CSI reports received after the receive time window expires. In some examples, for one or more CSI reports received after the receive time window expires, the receive window timer 840 may send a fake aggregated CSI report to the base station on an uplink channel before the first timing configuration expires.

[0154] The DCI component 845 may receive an indication from the base station to send a second DCI based on the coverage status of the second UE. In some examples, the DCI component 845 may send a second DCI including a trigger for measuring an aperiodic reference signal to the second UE on a sidelink channel, wherein the second DCI is sent based on the received indication. In some cases, the second UE is outside the coverage of the base station.

[0155] The sidelink CSI report transmitter 850 may send a channel state information report to the second UE on the second sidelink channel before the first timing configuration terminates. In some examples, the sidelink CSI report transmitter 850 may send a channel state information report to the second UE on a third sidelink channel before the first timing configuration terminates.

[0156] Fig. 9 A diagram of a system 900 of a device 905 including timeline considerations for supporting channel state information reporting of a sidelink channel according to various aspects of the present disclosure is shown. The device 905 may be an example of or include components of a device 605, a device 705, or a UE 115 as described herein. The device 905 may include components for two-way voice and data communications, including components for sending and receiving communications, including a communication manager 910, an I / O controller 915, a transceiver 920, an antenna 925, a memory 930, and a processor 940. These components may communicate electronically via one or more buses (e.g., a bus 945).

[0157] The communication manager 910 may receive first downlink control information including a first timing configuration and a trigger of a non-periodic reference signal from a base station, send a non-periodic reference signal to at least a second UE on a sidelink channel based on the trigger received in the first downlink control information, receive one or more channel state information reports including channel state information parameters measured based on the non-periodic reference signal from at least the second UE, aggregate the one or more channel state information reports during the first timing configuration, and send the aggregated channel state information report to the base station on an uplink channel before the first timing configuration is terminated.

[0158] The communication manager 910 may also send a capability report including UE timing capabilities to the base station, receive first downlink control information including a first timing configuration and a trigger for measuring a non-periodic reference signal from the base station, receive a non-periodic reference signal from a second UE on a first side link channel based on the received first downlink control information, and send a channel state information report to the second UE on a second side link channel before the first timing configuration is terminated.

[0159] The communication manager 910 may also receive first downlink control information including a first timing configuration and a trigger for measuring a non-periodic reference signal from the second UE on a first side link channel, receive a non-periodic reference signal from the second UE on a second side link channel based on the received first downlink control information, and send a channel state information report to the second UE on a third side link channel before the first timing configuration is terminated.

[0160] I / O controller 915 can manage input and output signals for device 905. I / O controller 915 can also manage peripheral devices that are not integrated into device 905. In some cases, I / O controller 915 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 915 can utilize a variety of communication methods such as Or another known operating system. In other cases, I / O controller 915 can represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, I / O controller 915 can be implemented as part of a processor. In some cases, a user can interact with device 905 via I / O controller 915 or via hardware components controlled by I / O controller 915.

[0161] The transceiver 920 may communicate bidirectionally via one or more antennas, wired or wireless links as described herein. For example, the transceiver 920 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 920 may also include a modem for modulating packets and providing the modulated packets to an antenna for transmission, and demodulating packets received from an antenna.

[0162] In some cases, a wireless device may include a single antenna 925. However, in some cases, a device may have multiple antennas 925, which may send or receive multiple wireless transmissions simultaneously.

[0163] The memory 930 may include RAM and ROM. The memory 930 may store computer-readable computer executable code 935, including instructions that, when executed, cause the processor to perform various functions described herein. In some cases, the memory 930 may contain, among other things, a basic I / O system (BIOS), which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0164] Processor 940 may include an intelligent hardware device (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, processor 940 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into processor 940. Processor 940 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 930) to cause device 905 to perform various functions (e.g., functions or tasks that support timeline considerations for channel state information reporting of a side link channel).

[0165] The code 935 may include instructions for implementing various aspects of the present invention, including instructions for supporting wireless communications. The code 935 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, the code 935 may not be directly executable by the processor 940, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0166] Fig.10 A block diagram 1000 of a device 1005 is shown that supports timeline considerations for channel state information reporting of a sidelink channel in accordance with various aspects of the present disclosure. The device 1005 may be an example of various aspects of a base station 105 as described herein. The device 1005 may include a receiver 1010, a communication manager 1015, and a transmitter 1020. The device 1005 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0167] The receiver 1010 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to timeline considerations for channel state information reports of sidelink channels, etc.). The information may be delivered to other components of the device 1005. The receiver 1010 may be a reference Fig.13 Examples of various aspects of the transceiver 1320 are described. The receiver 1010 may utilize a single antenna or a collection of antennas.

[0168] The communication manager 1015 may receive a capability report including UE timing capability from the first UE, send first downlink control information including a first timing configuration and a trigger of an aperiodic reference signal to the first UE based on the capability report, and receive from the first UE an aggregated channel state information report of a sidelink channel between the first UE and at least a second UE, the aggregated channel state information report being received before the first timing configuration is terminated. The communication manager 1015 may be an example of various aspects of the communication manager 1310 described herein.

[0169] The communication manager 1015 or its subcomponents may be implemented in hardware, code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 1015 or its subcomponents may be performed by a general purpose processor, a DSP, an application specific integrated circuit (ASIC), an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination designed to perform the functions described herein.

[0170] The communication manager 1015 or its subcomponents may be physically located in a variety of locations, including being distributed so that portions of the functionality are implemented by one or more physical components at different physical locations. In some examples, the communication manager 1015 or its subcomponents may be separate and distinct components, in accordance with various aspects of the invention. In some examples, the communication manager 1015 or its subcomponents may be combined with one or more other hardware components, including but not limited to input / output (I / O) components, a transceiver, a network server, another computing device, one or more other components described herein, or a combination according to various aspects of the invention.

[0171] Transmitter 1020 can transmit signals generated by other components of device 1005. In some examples, transmitter 1020 can be collocated with receiver 1010 in a transceiver module. For example, transmitter 1020 can be a reference Fig.13 Examples of various aspects of the described transceiver 1320. The transmitter 1020 may utilize a single antenna or a collection of antennas.

[0172] Fig.11 A block diagram 1100 of a device 1105 is shown that supports timeline considerations for channel state information reporting of a sidelink channel in accordance with various aspects of the present disclosure. The device 1105 may be an example of various aspects of the device 1005 or base station 105 as described herein. The device 1105 may include a receiver 1110, a communication manager 1115, and a transmitter 1135. The device 1105 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0173] The receiver 1110 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to timeline considerations for channel state information reports of sidelink channels, etc.). The information may be delivered to other components of the device 1105. The receiver 1110 may be a reference Fig.13 Examples of various aspects of the transceiver 1320 are described. The receiver 1110 may utilize a single antenna or a collection of antennas.

[0174] The communication manager 1115 may be an example of various aspects of the communication manager 1015 as described herein. The communication manager 1115 may include a capability reporting component 1120, a DCI component 1125, and a sidelink CSI report receiver 1130. The communication manager 1115 may be an example of various aspects of the communication manager 1310 described herein.

[0175] The capability reporting component 1120 can receive a capability report including UE timing capabilities from the first UE. The DCI component 1125 can send first downlink control information including a first timing configuration and a trigger of an aperiodic reference signal to the first UE based on the capability report. The sidelink CSI report receiver 1130 can receive from the first UE an aggregated channel state information report of a sidelink channel between the first UE and at least a second UE, the aggregated channel state information report being received before the first timing configuration is terminated.

[0176] Transmitter 1135 can transmit signals generated by other components of device 1105. In some examples, transmitter 1135 can be collocated with receiver 1110 in a transceiver module. For example, transmitter 1135 can be a reference Fig.13 Examples of various aspects of the transceiver 1320 are described. The transmitter 1135 can utilize a single antenna or a collection of antennas.

[0177] Fig.12 A block diagram 1200 of a communication manager 1205 supporting timeline considerations for channel state information reporting of a sidelink channel in accordance with various aspects of the present disclosure is shown. The communication manager 1205 may be an example of various aspects of the communication manager 1015, the communication manager 1115, or the communication manager 1310 described herein. The communication manager 1205 may include a capability reporting component 1210, a DCI component 1215, a sidelink CSI report receiver 1220, a timing configuration manager 1225, a coverage level manager 1230, and a receive window timer 1235. Each of these modules may communicate with each other directly or indirectly (e.g., via one or more buses).

[0178] The capability reporting component 1210 may receive a capability report including UE timing capabilities from the first UE. The DCI component 1215 may send a first downlink control information including a trigger of a first timing configuration and an aperiodic reference signal to the first UE based on the capability report. In some examples, the DCI component 1215 may send a second DCI including a trigger of a first timing configuration and a measurement aperiodic reference signal to the second UE. In some cases, the first DCI is the same as the second DCI. In some cases, the first DCI is different from the second DCI. In some cases, the second DCI and the aperiodic reference signal are in the same time slot, or the second DCI appears in the first time slot before the second time slot including the aperiodic reference signal. In some cases, the second UE is in partial coverage mode with the base station.

[0179] The sidelink CSI report receiver 1220 may receive, from the first UE, an aggregated channel state information report of a sidelink channel between the first UE and at least a second UE, the aggregated channel state information report being received before the first timing configuration is terminated. In some cases, the sidelink channel includes a physical sidelink shared channel (PSSCH) or a physical sidelink feedback channel (PSFCH).

[0180] The timing configuration manager 1225 may determine a first timing configuration based on capabilities of the first UE and capabilities of at least the second UE, wherein when the first timing configuration is shorter than the reported UE timing capabilities, the aggregated CSI report includes one or more fake CSI reports. In some cases, the first timing configuration defines a time period for the first UE to send the aggregated CSI report relative to when the first UE receives the one or more CSI reports. In some cases, the first timing configuration defines a time period for the first UE to send the aggregated CSI report relative to when the first UE receives the first DCI.

[0181] The coverage level manager 1230 may send an indication to the first UE to send a second DCI to the second UE based on the second UE being out of coverage of the base station. The receive window timer 1235 may send a receive time window configuration associated with a time period for the first UE to receive one or more CSI reports relative to when the first UE sends an aperiodic reference signal to the first UE.

[0182] Fig.13 A diagram of a system 1300 of a device 1305 including timeline considerations for supporting channel state information reporting of a sidelink channel according to various aspects of the present disclosure is shown. The device 1305 may be an example of or include components of a device 1005, a device 1105, or a base station 105 as described herein. The device 1305 may include components for two-way voice and data communications, including components for sending and receiving communications, including a communication manager 1310, a network communication manager 1315, a transceiver 1320, an antenna 1325, a memory 1330, a processor 1340, and an inter-station communication manager 1345. These components may be in electronic communication via one or more buses (e.g., a bus 1350).

[0183] The communication manager 1310 can receive a capability report including UE timing capabilities from the first UE, send first downlink control information including a first timing configuration and a trigger of a non-periodic reference signal to the first UE based on the capability report, and receive an aggregated channel state information report of a side link channel between the first UE and at least a second UE from the first UE, the aggregated channel state information report being received before the first timing configuration is terminated.

[0184] The network communications manager 1315 may manage communications with the core network (eg, via one or more wired backhaul links). For example, the network communications manager 1315 may manage the transmission of data communications with respect to client devices such as one or more UEs 115.

[0185] The transceiver 1320 may communicate bidirectionally via one or more antennas, wired or wireless links as described herein. For example, the transceiver 1320 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 1320 may also include a modem for modulating packets and providing the modulated packets to an antenna for transmission, and demodulating packets received from an antenna.

[0186] In some cases, a wireless device may include a single antenna 1325. However, in some cases, a device may have multiple antennas 1325, which may be able to send or receive multiple wireless transmissions simultaneously.

[0187] Memory 1330 may include RAM, ROM, or a combination thereof. Memory 1330 may store computer readable code 1335, including instructions that, when executed by a processor (e.g., processor 1340), cause the device to perform various functions described herein. In some cases, memory 1330 may contain, among other things, a BIOS that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0188] Processor 1340 may include an intelligent hardware device (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, processor 1340 may be configured to operate a memory array using a memory controller. In some cases, the memory controller may be integrated into processor 1340. Processor 1340 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1330) to cause device 1305 to perform various functions (e.g., functions or tasks that support timeline considerations for channel state information reporting of a side link channel).

[0189] The inter-site communication manager 1345 may manage communications with other base stations 105 and may include a controller or scheduler for controlling communications with UE 115 in coordination with other base stations 105. For example, the inter-site communication manager 1345 may coordinate the scheduling of transmissions to UE 115 for various interference mitigation techniques such as beamforming or joint transmission. In some examples, the inter-site communication manager 1345 may provide an X2 interface within an LTE / LTE-A wireless communication network technology to provide communications between base stations 105.

[0190] The code 1335 may include instructions for implementing various aspects of the present invention, including instructions for supporting wireless communications. The code 1335 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, the code 1335 may not be directly executable by the processor 1340, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0191] Fig.14 A flow chart of a method 1400 is shown for supporting timeline considerations for channel state information reporting for a sidelink channel in accordance with various aspects of the present disclosure. The operations of the method 1400 may be implemented by the UE 115 or a component thereof, as described herein. For example, the operations of the method 1400 may be performed by a communication manager, as described in reference to Figures 6 to 9 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described herein.

[0192] At 1405, the UE may receive first downlink control information including a first timing configuration and a trigger of an aperiodic reference signal from a base station. The operations of 1405 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1405 may be performed as described in reference to Figures 6 to 9 The timing configuration manager is used to execute.

[0193] At 1410, the UE may receive first downlink control information including a trigger of an aperiodic reference signal based on a first timing configuration from a base station. The operations of 1410 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1410 may be performed as described in reference to Figures 6 to 9 The timing configuration manager is executed.

[0194] At 1415, the UE may send an aperiodic reference signal to at least a second UE on a sidelink channel based on a trigger received in the first downlink control information. The operations of 1415 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1415 may be performed as described in reference to Figures 6 to 9 The AP-RS component executes.

[0195] At 1420, the UE may receive one or more channel state information reports including channel state information parameters measured based on the aperiodic reference signal from at least a second UE. The operations of 1420 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1420 may be performed as described in reference to Figures 6 to 9 The sidelink CSI reporting receiver performs

[0196] At 1425, the UE may aggregate one or more channel state information reports during the first timing configuration. The operations of 1425 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1425 may be performed as described in reference to Figures 6 to 9 The aggregator performs the

[0197] At 1430, the UE may send an aggregated channel state information report to the base station on the uplink channel before the first timing configuration expires. The operations of 1430 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1430 may be performed as described in reference to Figures 6 to 9 The sidelink CSI reporting manager is executed.

[0198] Fig.15 A flow chart illustrating a method 1500 for supporting timeline considerations for channel state information reporting for a sidelink channel in accordance with various aspects of the present disclosure is shown. The operations of the method 1500 may be implemented by the UE 115 or a component thereof, as described herein. For example, the operations of the method 1500 may be performed by a communication manager, as described with reference to Figures 6 to 9 In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described herein.

[0199] At 1505, the UE may send a capability report including the UE timing capability to the base station. The operations of 1505 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1505 may be performed as described in reference to Figures 6 to 9 The capability reporting component performs.

[0200] At 1510, the UE may receive first downlink control information including a first timing configuration and a trigger of an aperiodic reference signal from a base station. The operations of 1510 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1510 may be performed as described in reference to Figures 6 to 9 The timing configuration manager is executed.

[0201] At 1515, the UE may send an aperiodic reference signal to at least a second UE on a sidelink channel based on a trigger received in the first downlink control information. The operations of 1515 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1515 may be performed as described in reference to Figures 6 to 9 The AP-RS component executes.

[0202] At 1520, the UE may receive one or more channel state information reports including channel state information parameters measured based on an aperiodic reference signal from at least a second UE. The operations of 1520 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1520 may be performed as described in reference to Figures 6 to 9 The sidelink CSI reporting receiver performs

[0203] At 1525, the UE may aggregate one or more channel state information reports during the first timing configuration. The operations of 1525 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1525 may be performed as described in reference to Figures 6 to 9 The aggregator performs the

[0204] At 1530, the UE may send an aggregated channel state information report to the base station on the uplink channel before the first timing configuration expires. The operations of 1530 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1530 may be performed as described in reference to Figures 6 to 9 The sidelink CSI reporting manager is executed.

[0205] At 1535, when the first timing configuration is shorter than the reported UE timing capability, the UE may avoid sending an aggregated CSI report. The operations of 1535 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1535 may be as described with reference to Figures 6 to 9 The sidelink CSI reporting manager is executed.

[0206] Fig.16 A flow chart of a method 1600 is shown for supporting timeline considerations for channel state information reporting for a sidelink channel in accordance with various aspects of the present disclosure. The operations of the method 1600 may be implemented by the UE 115 or a component thereof, as described herein. For example, the operations of the method 1600 may be performed by a communication manager, as described with reference to Figures 6 to 9 In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described herein.

[0207] At 1605, the UE may receive an indication from the base station to send a second DCI based on the coverage status of the second UE. The operation of 1605 may be performed according to the methods described herein. In some examples, various aspects of the operation of 1605 may be performed as described in reference to Figures 6 to 9 The DCI component executes.

[0208] At 1610, the UE may receive first downlink control information including a first timing configuration and a trigger of an aperiodic reference signal from a base station. The operations of 1610 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1610 may be performed as described in reference to Figures 6 to 9 The timing configuration manager is executed.

[0209] At 1615, the UE may send a second DCI including a trigger to measure the aperiodic reference signal to a second UE on a sidelink channel, wherein the second DCI is sent based on the received indication. The operations of 1615 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1615 may be performed as described in reference to Figures 6 to 9 The DCI component executes.

[0210] At 1620, the UE may send an aperiodic reference signal to at least a second UE on a sidelink channel based on a trigger received in the first downlink control information. The operations of 1620 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1620 may be performed as described in reference to Figures 6 to 9 The AP-RS component executes.

[0211] At 1625, the UE may receive one or more channel state information reports including channel state information parameters measured based on the aperiodic reference signal from at least a second UE. The operations of 1625 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1625 may be performed as described in reference to Figures 6 to 9 The sidelink CSI reporting receiver performs

[0212] At 1630, the UE may aggregate one or more channel state information reports during the first timing configuration. The operations of 1630 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1630 may be performed as described in reference to Figures 6 to 9 The aggregator performs the

[0213] At 1635, the UE may send an aggregated channel state information report to the base station on the uplink channel before the first timing configuration expires. The operations of 1635 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1635 may be performed as described in reference to Figures 6 to 9 The sidelink CSI reporting manager is executed.

[0214] Fig.17A flow chart of a method 1700 for supporting timeline considerations for channel state information reporting for a sidelink channel in accordance with various aspects of the present disclosure is shown. The operations of the method 1700 may be implemented by the UE 115 or a component thereof, as described herein. For example, the operations of the method 1700 may be performed by a communication manager, as described in reference to Figures 6 to 9 In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described herein.

[0215] At 1705, the UE may send a capability report including the UE timing capability to the base station. The operations of 1705 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1705 may be performed as described in reference to Figures 6 to 9 The capability reporting component performs.

[0216] At 1710, the UE may receive a first timing configuration from a base station. The operations of 1710 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1710 may be performed as described in reference to Figures 6 to 9 The timing configuration manager is executed.

[0217] At 1715, the UE may receive first downlink control information including a trigger for measuring an aperiodic reference signal from the base station based on the first timing configuration. The operations of 1710 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1710 may be performed as described in reference to Figures 6 to 9 The timing configuration manager is executed.

[0218] At 1720, the UE may receive an aperiodic reference signal from a second UE on a first sidelink channel based on the received first downlink control information. The operations of 1720 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1720 may be performed as described in reference to Figures 6 to 9 The AP-RS component executes.

[0219] At 1725, the UE may send a channel state information report to the second UE on the second sidelink channel before the first timing configuration expires. The operations of 1725 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1725 may be performed as described in reference to Figures 6 to 9 The sidelink CSI report transmitter is executed.

[0220] Fig.18A flow chart of a method 1800 for supporting timeline considerations for channel state information reporting for a sidelink channel in accordance with various aspects of the present disclosure is shown. The operations of the method 1800 may be implemented by the UE 115 or a component thereof, as described herein. For example, the operations of the method 1800 may be performed by a communication manager, as described in reference to Figures 6 to 9 In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described herein.

[0221] At 1805, the UE may receive a first timing configuration from a second UE on a first sidelink channel. The operations of 1805 may be performed according to methods described herein. In some examples, various aspects of the operations of 1805 may be performed as described in reference to Figures 6 to 9 The timing configuration manager is executed.

[0222] At 1810, the UE may receive first control information including a trigger for measuring an aperiodic reference signal from a second UE on a first sidelink channel based on a first timing configuration. The operations of 1810 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1810 may be performed as described in reference to Figures 6 to 9 The timing configuration manager is executed.

[0223] At 1815, the UE may receive an aperiodic reference signal from a second UE on a second sidelink channel based on the received first control information. The operations of 1815 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1815 may be performed as described in reference to Figures 6 to 9 The AP-RS component executes.

[0224] At 1820, the UE may send a channel state information report to the second UE on the third sidelink channel before the first timing configuration expires. The operations of 1820 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1820 may be performed as described in reference to Figures 6 to 9 The sidelink CSI report transmitter is executed.

[0225] Fig.19 A flow chart of a method 1900 for supporting timeline considerations for channel state information reporting for a sidelink channel according to various aspects of the present disclosure is shown. The operations of the method 1900 may be implemented by a base station 105 or a component thereof as described herein. For example, the operations of the method 1900 may be performed by a communication manager, as described in reference to Figures 10 to 13In some examples, the base station may execute a set of instructions to control functional elements of the base station to perform the functions described herein. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described herein.

[0226] At 1905, the base station may receive a capability report including UE timing capabilities from the first UE. The operations of 1905 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1905 may be performed as described in reference to Figures 10 to 13 The capability reporting component performs.

[0227] At 1910, the base station may send first downlink control information including a first timing configuration and a trigger of an aperiodic reference signal to the first UE based on the capability report. The operations of 1910 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1910 may be performed as described in reference to Figures 10 to 13 The DCI component executes.

[0228] At 1915, the base station may receive, from the first UE, an aggregated channel state information report of a sidelink channel between the first UE and at least a second UE, the aggregated channel state information report being received before the first timing configuration terminates. The operations of 1915 may be performed according to the methods described herein. In some examples, various aspects of the operations of 1915 may be performed as described with reference to Figures 10 to 13 The sidelink CSI reporting receiver performs

[0229] Fig. 20 A flow chart of a method 2000 for supporting timeline considerations for channel state information reporting for a sidelink channel according to various aspects of the present disclosure is shown. The operations of the method 2000 may be implemented by a base station 105 or a component thereof as described herein. For example, the operations of the method 2000 may be performed by a communication manager, as described in reference to Figures 10 to 13 In some examples, the base station may execute a set of instructions to control functional elements of the base station to perform the functions described herein. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described herein.

[0230] At 2005, the base station may receive a capability report including UE timing capabilities from the first UE. The operations of 2005 may be performed according to the methods described herein. In some examples, various aspects of the operations of 2005 may be performed as described in reference to Figures 10 to 13 The capability reporting component is used to perform the above operations.

[0231] At 2010, the base station may send first downlink control information including a first timing configuration and a trigger of an aperiodic reference signal to the first UE based on the capability report. The operation of 2010 may be performed according to the method described herein. In some examples, various aspects of the operation of 2010 may be performed as described in reference to Figures 10 to 13 The DCI component executes.

[0232] At 2015, the base station may send a second DCI including the first timing configuration and a trigger for measuring the aperiodic reference signal to the second UE. The operations of 2015 may be performed according to the methods described herein. In some examples, various aspects of the operations of 2015 may be performed as described in reference to Figures 10 to 13 The DCI component executes.

[0233] At 2020, the base station may receive, from the first UE, an aggregated channel state information report of a sidelink channel between the first UE and at least the second UE, the aggregated channel state information report being received before the first timing configuration is terminated. The operations of 2020 may be performed according to the methods described herein. In some examples, various aspects of the operations of 2020 may be performed as described in reference to Figures 10 to 13 The sidelink CSI reporting receiver performs

[0234] Fig.21 A flow chart of a method 2100 for supporting timeline considerations for channel state information reporting for a sidelink channel according to various aspects of the present disclosure is shown. The operations of the method 2100 may be implemented by a base station 105 or a component thereof as described herein. For example, the operations of the method 2100 may be performed by a communication manager, as described in reference to Figures 10 to 13 In some examples, the base station may execute a set of instructions to control functional elements of the base station to perform the functions described herein. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described herein.

[0235] At 2105, the base station may send an indication to the first UE to send a second DCI to the second UE based on the second UE being beyond the coverage of the base station. The operation of 2105 may be performed according to the methods described herein. In some examples, various aspects of the operation of 2105 may be performed as described in reference to Figures 10 to 13 The coverage level manager is executed.

[0236] At 2110, the base station may receive a capability report including UE timing capabilities from the first UE. The operations of 2110 may be performed according to the methods described herein. In some examples, various aspects of the operations of 2110 may be performed as described in reference to Figures 10 to 13 The capability reporting component performs.

[0237] At 2115, the base station may send first downlink control information including a first timing configuration and a trigger of an aperiodic reference signal to the first UE based on the capability report. The operations of 2115 may be performed according to the methods described herein. In some examples, various aspects of the operations of 2115 may be performed as described in reference to Figures 10 to 13 The DCI component executes.

[0238] At 2120, the base station may receive, from the first UE, an aggregated channel state information report of a sidelink channel between the first UE and at least the second UE, the aggregated channel state information report being received before the first timing configuration is terminated. The operations of 2120 may be performed according to the methods described herein. In some examples, various aspects of the operations of 2120 may be performed as described in reference to Figures 10 to 13 The sidelink CSI reporting receiver performs

[0239] It should be noted that the methods described herein describe possible implementations, and that operations and steps may be rearranged or otherwise modified, and that other implementations are possible. Furthermore, aspects from two or more methods may be combined.

[0240] Various aspects of the following examples may be combined with any previous examples or aspects described herein. For example, Example 1 is a method for wireless communication at a first user equipment (UE), comprising: receiving a first timing configuration from a base station, at least partially based on the first timing configuration, receiving a first downlink control information including a trigger of a non-periodic reference signal from the base station, at least partially based on the trigger received in the first downlink control information, sending a non-periodic reference signal to at least a second UE on a sidelink channel, receiving one or more channel state information reports including channel state information parameters measured based at least partially on the non-periodic reference signal from at least the second UE, aggregating one or more channel state information reports during the first timing configuration, and sending the aggregated channel state information report to the base station on an uplink channel before the first timing configuration terminates.

[0241] In Example 2, the method of Example 1 may further include sending a capability report including UE timing capabilities to the base station, and avoiding sending an aggregated channel state information (CSI) report when the first timing configuration is shorter than the reported UE timing capabilities.

[0242] In Example 3, the method of any one of Examples 1-2 may include: avoiding further including sending a false aggregated CSI report to the base station on an uplink channel before the first timing configuration is terminated when the first timing configuration is shorter than the reported UE timing capability, or discarding the aggregated CSI report when the first timing configuration is shorter than the reported UE timing capability.

[0243] In Example 4, the method of any one of Examples 1-3 may include the first timing configuration being based at least in part on a capability of the first UE and a capability of the second UE.

[0244] In Example 5, the method of any of Examples 1-4 may also include receiving one or more channel state information (CSI) reports within a reception time window based at least in part on the received first downlink control information (DCI).

[0245] In Example 6, the method of any one of Examples 1-5 may include: the aggregation further includes aggregating one or more CSI reports received within the receiving time window, discarding one or more CSI reports received after the receiving time window terminates, or for one or more CSI reports received after the receiving time window terminates, sending a forged aggregated CSI report to the base station on an uplink channel before the first timing configuration terminates.

[0246] In Example 7, the method of any one of Examples 1-6 may include a first timing configuration defining a time period for the first UE to send an aggregate channel state information (CSI) report relative to when the first UE receives one or more CSI reports.

[0247] In Example 8, the method of any one of Examples 1-7 may include a first timing configuration defining a time period for the first UE to send an aggregated channel state information (CSI) report relative to when the first UE receives first downlink control information (DCI).

[0248] In Example 9, the method of any one of Examples 1-8 may include the first downlink control information (DCI) and the non-periodic reference signal in the same time slot, or the first DCI is in a first time slot that occurs before a second time slot including the non-periodic reference signal.

[0249] In Example 10, the method of any one of Examples 1-9 may include: the sidelink includes a physical sidelink shared channel (PSSCH), and the uplink channel includes PSSCH, a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), or a physical sidelink feedback channel (PSFCH).

[0250] In Example 11, the method of any one of Examples 1-10 may also include: receiving an indication to send a second downlink control information (DCI) from a base station based at least in part on a coverage status of the second UE, and sending a second DCI including a trigger for measuring a non-periodic reference signal to the second UE on a side link channel, wherein the second DCI is sent based at least in part on the received indication.

[0251] In Example 12, the method of any of Examples 1-11 may include the second UE being outside of coverage of the base station.

[0252] Example 13 is a method for performing wireless communications at a first user equipment (UE), comprising: sending a capability report including UE timing capabilities to a base station, receiving a first timing configuration from the base station, receiving first downlink control information including a trigger for measuring a non-periodic reference signal from the base station based at least in part on the first timing configuration, receiving a non-periodic reference signal from a second UE on a first side link channel based at least in part on the received first downlink control information, and sending channel state information to a second UE report on a second side link channel before the first timing configuration is terminated.

[0253] In Example 14, the method of Example 13 may include the first timing configuration defining a time period for the second UE to send an aggregated channel state information (CSI) report to the base station relative to when the second UE receives the CSI report.

[0254] In Example 15, the method of any one of Examples 13-14 may include the first downlink control information (DCI) and the non-periodic reference signal in the same time slot, or the first DCI is in a first time slot that occurs before a second time slot including the non-periodic reference signal.

[0255] In Example 16, the method of any one of Examples 13-15 may include: the first side link channel includes a physical side link shared channel (PSSCH), and the second side link channel includes the PSSCH or a physical side link feedback channel (PSFCH).

[0256] Example 17 is a method for performing wireless communications at a first user equipment (UE), comprising: receiving a first timing configuration from a second UE on a first side link channel, receiving first downlink channel information including a trigger for measuring a non-periodic reference signal from the second UE on the first side link channel based at least in part on the first timing configuration, receiving a non-periodic reference signal from the second UE on a second side link channel based at least in part on the received first control information, and sending a channel state information report to the second UE on a third side link channel before the first timing configuration terminates.

[0257] In Example 18, the method of Example 17 may include the first control information triggering transmission of a channel state information (CSI) report from the plurality of UEs to the second UE.

[0258] In Example 19, the method of any one of Examples 17-18 may include a first timing configuration defining a time period for the second UE to send an aggregated channel state information (CSI) report to the base station relative to when the second UE receives the CSI report.

[0259] In Example 20, the method of any one of Examples 17-19 may include the first control information and the aperiodic reference signal being in the same time slot, or the first control information being in a first time slot occurring before a second time slot including the aperiodic reference signal.

[0260] In Example 21, the method of any one of Examples 17-20 may include: the first side link channel includes a physical side link shared channel (PSSCH), the second side link channel includes PSSCH or PUSCH, and the third side link channel includes PSSCH or a physical side link feedback channel (PSFCH).

[0261] Example 22 is a method for performing wireless communications at a base station, comprising: receiving a capability report including UE timing capabilities from a first user equipment (UE), sending first downlink control information including a first timing configuration and a trigger of a non-periodic reference signal to the first UE based at least in part on the capability report, and receiving an aggregated channel state information report of a side link channel between the first UE and at least a second UE from the first UE, the aggregated channel state information report being received before termination of the first timing configuration.

[0262] In Example 23, the method of Example 22 may also include determining a first timing configuration based at least in part on the capabilities of the first UE and the capabilities of at least the second UE, wherein, when the first timing configuration is shorter than the reported UE timing capability, the aggregated channel state information (CSI) report includes one or more false CSI reports.

[0263] In Example 24, the method of any one of Examples 22-23 may further include sending second downlink control information (DCI) including the first timing configuration and a trigger to measure the aperiodic reference signal to the second UE.

[0264] In Example 25, the method of any of Examples 22-24 may include the first DCI being the same as the second DCI.

[0265] In Example 26, the method of any one of Examples 22-25 may include the first DCI being different from the second DCI.

[0266] In Example 27, the method of any one of Examples 22-26 may include the second DCI and the aperiodic reference signal being in the same time slot, or the second DCI being in a first time slot occurring before a second time slot including the aperiodic reference signal.

[0267] In Example 28, the method of any one of Examples 22-27 may include the second UE being in partial coverage mode with the base station.

[0268] In Example 29, the method of any one of Examples 22-28 may also include sending an indication to the first UE to send second downlink control information (DCI) to the second UE based at least in part on the second UE not being within coverage of the base station.

[0269] In Example 30, the method of any one of Examples 22-29 may include a first timing configuration defining a time period for the first UE to send an aggregated channel state information (CSI) report relative to when the first UE receives one or more CSI reports.

[0270] In Example 31, the method of any one of Examples 22-30 may include a first timing configuration defining a time period for the first UE to send an aggregated channel state information (CSI) report relative to when the first UE receives first downlink control information (DCI).

[0271] In Example 32, the method of any one of Examples 22-31 may also include sending to the first UE a receive time window configuration associated with a time period for the first UE to receive one or more channel state information (CSI) reports relative to when the first UE sends a non-periodic reference signal.

[0272] In Example 33, the method of any one of Examples 22-32 may include: the sidelink channel includes a physical sidelink shared channel (PSSCH) or a physical sidelink feedback channel (PSFCH).

[0273] Example 34 is a system or apparatus comprising modules for implementing the method or apparatus of any one of Examples 1-33.

[0274] Example 35 is a non-transitory computer-readable medium storing instructions executable by one or more processors to cause the one or more processors to implement a method as shown in any one of Examples 1-33.

[0275] Example 36 is a system including one or more processors and a memory in electronic communication with the one or more processors, storing instructions that can be executed by the one or more processors to cause the system or device to implement a method as shown in any of Examples 1-33.

[0276] The technology described herein can be used for 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 other systems. CDMA systems can implement radio technologies such as CDMA2000, Universal Terrestrial Radio Access (UTRA). CDMA2000 covers IS-2000, IS-95 and IS-856 standards. IS-2000 versions are commonly referred to as CDMA2000 1X, 1X, etc. IS-856 (TIA-856) is commonly referred to as CDMA2000 1xEV DO, High Speed ​​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).

[0277] An OFDMA system may implement radio technologies such as Ultra Mobile Broadband (UMB), Evolved UTRA (E-UTRA), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash OFDM, etc. UTRA and E-UTRA are part of Universal Mobile Telecommunications System (UMTS). LTE, LTE-A, and LTE-A Pro are versions of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, LTE-A Pro, NR, and GSM are described in documents from an organization named "3rd Generation Partnership Project" (3GPP). CDMA2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2). The techniques described herein may be used for the systems and radio technologies mentioned herein as well as other systems and radio technologies. Although various aspects of an LTE, LTE-A, LTE-A-Pro, or NR system may be described for example purposes, and LTE, LTE-A, LTE-A-Pro, or NR terminology may be used in much of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A-Pro, or NR applications.

[0278] A macro cell typically covers a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access to a UE by subscribing to a service from a network provider. A small cell may be associated with a base station with lower power than a macro cell, and the small cell may operate in the same or different frequency bands (e.g., licensed, unlicensed, etc.) as the macro cell. According to various examples, a small cell may include a pico cell, a femto cell, and a micro cell. For example, a pico cell may cover a small geographic area and may allow unrestricted access to a UE by subscribing to a service from a network provider. A femto cell may also cover a small geographic area (e.g., a home) and may provide restricted access to a UE associated with the femto cell (e.g., a UE in a closed subscriber group (CSG), a UE of a user in a home, etc.). An eNB for a macro cell may be referred to as a macro eNB. An eNB for a small cell may be referred to as a small cell eNB, a pico eNB, a femto eNB, or a home eNB. An eNB may support one or more (e.g., two, three, four, etc.) cells and may also support communications using one or more component carriers.

[0279] The wireless communication systems described herein may support synchronous or asynchronous operation. For synchronous operation, the base stations may have similar frame timing, and transmissions from different base stations may be approximately aligned in time. For asynchronous operation, the base stations may have different frame timing, and transmissions from different base stations may not be aligned in time. The techniques described herein may be used for synchronous or asynchronous operation.

[0280] The information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0281] The various illustrative blocks and modules described in conjunction with the disclosure herein may be implemented or executed using a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in an alternative, 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, a plurality of microprocessors, a combination of one or more microprocessors with a DSP core, or any other such configuration).

[0282] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted by a computer-readable medium as one or more instructions or codes. Other examples and implementations are within the scope of the present invention and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hard wiring, or a combination of any of them. Features that implement the functions may also be physically located in various locations, including being distributed so that parts of the functions are implemented in different physical locations.

[0283] Computer-readable media include non-transitory computer storage media and communication media, including any media that facilitates the transfer of computer programs from one place to another. Non-transitory storage media can be any available media that can be accessed by a general or special-purpose computer. As an example and not limitation, non-transitory computer-readable media may include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), flash memory, compact disk (CD) ROM or other optical disk storage, disk storage or other magnetic storage device, or any other non-transitory medium, which can be used to carry or store the required program code module in the form of instructions or data structures, and can be accessed by a general or special-purpose computer or a general or special-purpose processor. In addition, any connection is properly referred to as a computer-readable medium. For example, if a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wireless technologies such as infrared, radio and microwaves are used to transmit software from a website, server or other remote source, then the use of coaxial cable, fiber optic cable, twisted pair, DSL or wireless technologies such as infrared, radio and microwaves are included in the definition of medium. As used herein, disk and disc include CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

[0284] As used herein, "or", including in the claims, or as used in a list of items (e.g., a list of items beginning with a phrase such as "at least one" or "one or more") indicates an inclusive list, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). In addition, as used herein, the phrase "based on" should not be interpreted as a reference to a closed set of conditions. For example, an exemplary step described as "based on condition A" can be based on condition A and condition B without departing from the scope of the present invention. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on".

[0285] In the drawings, similar components or features may have the same reference number. In addition, various components of the same type may be distinguished by following the reference number with a dash and a second reference number that distinguishes the similar components. If only the first reference number is used in the specification, the description applies to any one of the similar components having the same first reference number, without regard to the second or other subsequent reference numbers.

[0286] The description set forth herein in conjunction with the accompanying drawings describes exemplary configurations and does not represent all examples that may be implemented or within the scope of the claims. The term "exemplary" as used herein means "used as an example, instance, or illustration," rather than "preferred" or "superior to other examples." The detailed description includes specific details to provide an understanding of the described technology. However, these technologies can be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form to avoid confusing the concepts of the described examples.

[0287] The description herein is intended to enable those skilled in the art to make or use the present invention. Various modifications to the present invention will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the present invention. Therefore, the present invention is not limited to the examples and designs described herein, but conforms to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a first user equipment UE, comprising: receiving a first timing configuration from a second UE on a first sidelink channel, wherein the first UE and the second UE are different UEs; receiving, on a first sidelink channel, first control information from a second UE including a trigger to measure an aperiodic reference signal based at least in part on the first timing configuration, wherein the first control information is relayed from the second UE to the first UE based at least in part on the first UE being out of coverage relative to a network device; receiving an aperiodic reference signal from a second UE on a second sidelink channel based at least in part on the received first control information; as well as Before the first timing configuration expires, a channel state information (CSI) report is sent to the second UE on a third sidelink channel.

2. The method according to claim 1, wherein: The first control information triggers transmission of CSI reports from the plurality of UEs to a second UE.

3. The method according to claim 1, wherein: The first control information and the aperiodic reference signal are in the same time slot, or the first control information is in a first time slot occurring before a second time slot including the aperiodic reference signal.

4. The method according to claim 1, wherein: The first sidelink channel comprises a physical sidelink shared channel PSSCH, the second sidelink channel comprises PSSCH or a physical uplink shared channel PUSCH, and the third sidelink channel comprises PSSCH or a physical sidelink feedback channel PSFCH.

5. The method according to claim 1, wherein: The first timing configuration defines a time period for the second UE to send an aggregated CSI report to the network device relative to when the second UE receives the CSI report.

6. A method for wireless communication at a first user equipment UE, comprising: Sending a capability report including the timing capability of the first UE to a network device; receiving a first timing configuration from a network device; receiving, from a network device, first downlink control information (DCI) including a trigger to measure an aperiodic reference signal based at least in part on the first timing configuration; receiving, based at least in part on the received first DCI, an aperiodic reference signal from a second UE on a first sidelink channel, wherein the first UE and the second UE are different UEs; as well as Prior to termination of a first timing configuration, a channel state information report is sent to a second UE on a second sidelink channel, wherein the first timing configuration defines a time period for the second UE to send an aggregated CSI report to the network device relative to when the second UE receives the CSI report, and wherein receiving a first DCI from the network device and sending the CSI report to the second UE is based at least in part on the first UE being in a partial coverage state relative to the network device.

7. The method according to claim 6, wherein: The first DCI and the aperiodic reference signal are in the same time slot, or the first DCI is in a first time slot that occurs before a second time slot that includes the aperiodic reference signal.

8. The method according to claim 6, wherein: The first sidelink channel comprises a physical sidelink shared channel PSSCH, and the second sidelink channel comprises the PSSCH or a physical sidelink feedback channel PSFCH.

9. A method for wireless communication at a first user equipment UE, comprising: Sending a capability report including the timing capability of the first UE to a network device; receiving, from a network device, a first timing configuration indicating a duration based at least in part on the timing capability of the first UE; receiving, from a network device, first downlink control information (DCI) including a trigger of an aperiodic reference signal based at least in part on the first timing configuration; transmitting, based at least in part on a trigger received in the first DCI, an aperiodic reference signal on a sidelink channel to at least a second UE; receiving, from at least the second UE, one or more channel state information (CSI) reports comprising CSI parameters measured based at least in part on an aperiodic reference signal; aggregating the one or more CSI reports during the first timing configuration; as well as Prior to termination of the first timing configuration, an aggregated CSI report is sent to a network device on an uplink channel.

10. The method according to claim 9, further comprising: Avoiding sending an aggregated CSI report when the first timing configuration is shorter than the reported timing capability of the first UE.

11. The method according to claim 10, wherein: The avoidance further includes: When the first timing configuration is shorter than the reported timing capability of the first UE, sending a spurious aggregated CSI report to the network device on an uplink channel before the first timing configuration expires; or When the first timing configuration is shorter than the reported UE timing capability, the aggregated CSI report is discarded.

12. The method according to claim 10, wherein: The first timing configuration is based at least in part on capabilities of the first UE and capabilities of the second UE.

13. The method according to claim 9, further comprising: One or more CSI reports are received within a reception time window based at least in part on the received first DCI.

14. The method according to claim 13, wherein: The aggregating the one or more CSI reports during the first timing configuration further comprises: aggregating one or more CSI reports received within a receiving time window; discarding one or more CSI reports received after the reception time window expires; or For one or more CSI reports received after the reception time window expires, a spurious aggregated CSI report is sent to the network device on an uplink channel before the first timing configuration expires.

15. The method according to claim 9, wherein: The first timing configuration defines a time period when the first UE sends the aggregated CSI report relative to when the first UE receives one or more CSI reports.

16. The method according to claim 9, wherein: The first timing configuration defines a time period for the first UE to send an aggregated CSI report relative to when the first UE receives the first DCI.

17. The method according to claim 9, wherein: The first DCI and the aperiodic reference signal are in the same time slot, or the first DCI is in a first time slot that occurs before a second time slot that includes the aperiodic reference signal.

18. The method according to claim 9, wherein: The sidelink channels include a physical sidelink shared channel PSSCH, and the uplink channels include PSSCH, a physical uplink shared channel PUSCH, a physical uplink control channel PUCCH, or a physical sidelink feedback channel PSFCH.

19. The method according to claim 9, further comprising: receiving an indication to send a second DCI from a network device based at least in part on the coverage status of the second UE; as well as A second DCI including a trigger to measure the aperiodic reference signal is sent to the second UE on the sidelink channel, wherein the second DCI is sent based at least in part on the received indication.

20. The method according to claim 19, wherein: The second UE is located out of coverage of the network device.

21. A method for wireless communication at a network device, comprising: receiving, from a first user equipment UE, a capability report comprising a timing capability of the first UE and a timing capability of at least a second UE; Sending first downlink control information (DCI) including a first timing configuration and a trigger of an aperiodic reference signal to a first UE, wherein the first timing configuration indicates a duration based at least in part on a timing capability of the first UE and a timing capability of at least the second UE; as well as An aggregated channel state information (CSI) report of a sidelink channel between the first UE and at least a second UE is received from the first UE, the aggregated CSI report being received before termination of the first timing configuration.

22. The method according to claim 21, further comprising: A first timing configuration is determined based at least in part on capabilities of the first UE and capabilities of at least a second UE, wherein when the first timing configuration is shorter than reported UE timing capabilities, the aggregated CSI report includes one or more spurious CSI reports.

23. The method according to claim 21, further comprising: A second DCI including the first timing configuration and a trigger for measuring the aperiodic reference signal is sent to the second UE.

24. The method according to claim 23, wherein: The first DCI is the same as the second DCI.

25. The method according to claim 23, wherein: The first DCI is different from the second DCI.

26. The method of claim 23, wherein: The second DCI and the aperiodic reference signal are in the same time slot, or the second DCI is in a first time slot occurring before a second time slot including the aperiodic reference signal.

27. The method of claim 21, further comprising: Based at least in part on the second UE being out of coverage of the network device, an indication is sent to the first UE to send a second DCI to the second UE.

28. The method of claim 21, wherein: The first timing configuration defines a time period when the first UE sends an aggregated CSI report relative to when the first UE receives one or more CSI reports.

29. The method according to claim 21, wherein: The first timing configuration defines a time period for the first UE to send an aggregated CSI report relative to when the first UE receives the first DCI.

30. An apparatus for wireless communication, comprising: Memory; as well as One or more processors coupled to the memory, the one or more processors configured to execute the method of any one of claims 1-29.

31. A non-transitory computer-readable medium storing one or more instructions for wireless communication, wherein the one or more instructions, when executed by one or more processors, cause the one or more processors to perform the method of any one of claims 1-29.

32. An apparatus for wireless communication, comprising means for performing the method of any one of claims 1-29.

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