Channel state information based on sidelink

Abstract

Certain aspects of the present disclosure provide for providing channel state information associated with a sidelink air interface. A method that can be performed by a first wireless node (e.g., a user device) includes receiving a reference signal (RS) configuration indicating one or more sidelink resource sets from a base station and sending one or more sidelink reference signals to one or more second wireless nodes based at least in part on the RS configuration. The method also includes receiving one or more feedback reports from the one or more second wireless nodes, wherein each feedback report in the feedback report includes an ordered sequence of at least one parameter associated with a sidelink channel quality of the sidelink reference signal. The method also includes forwarding the one or more feedback reports to the base station.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to U.S. Application No. 16 / 993,138, filed on August 13, 2020, which claims the benefit of and priority to Greek Patent Application No. 20190100363, filed on August 16, 2019, both of which are incorporated herein by reference in their entirety. Technical Field

[0003] Aspects of the present disclosure relate to wireless communications and, more particularly, to techniques for providing channel state information associated with a sidelink air interface. Background Art

[0004] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, information transfer, broadcast, etc. These wireless communication systems may employ multiple access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access systems include the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) system, the LTE-Advanced system (LTE-A), the Code Division Multiple Access (CDMA) system, the Time Division Multiple Access (TDMA) system, the Frequency Division Multiple Access (FDMA) system, the Orthogonal Frequency Division Multiple Access (OFDMA) system, the Single Carrier Frequency Division Multiple Access (SC-FDMA) system, and the Time Division Synchronous Code Division Multiple Access (TD-SCDMA) system, to name a few.

[0005] These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate at a city, country, region, and even global level. New Radio or (e.g., 5G NR) is an example of an emerging telecommunication standard. NR is an enhancement set to the LTE mobile standard released by 3GPP. NR is designed to better integrate with other open standards by improving spectrum efficiency, reducing costs, improving services, utilizing new spectrum, and using OFDMA with cyclic prefix (CP) on the downlink (DL) and on the uplink (UL), so as to better support mobile broadband Internet access. To this end, NR supports beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.

[0006] However, as the demand for mobile broadband access continues to increase, there is a need for further improvements to NR and LTE technologies. Preferably, these improvements should be applicable to other multiple access technologies and the telecommunication standards that employ these technologies. Summary of the invention

[0007] The systems, methods, and devices of the present disclosure each have several aspects, no single aspect of which is solely responsible for its desirable attributes. Without limiting the scope of the present disclosure as expressed by the appended claims, some features will now be briefly discussed. After considering this discussion, and especially after reading the section entitled "Detailed Description," it will be understood how the features of the present disclosure provide advantages, which may include sidelink channel state information that can enable desired estimates of channel conditions between wireless communication devices.

[0008] Certain aspects provide a method for wireless communication by a first wireless node. The method may include receiving a channel state information (CSI) report configuration from a base station, the CSI report configuration indicating reporting feedback associated with one or more side link communication links. The CSI report configuration may be associated with one or more side link resource sets. The method may also include sending a measurement configuration and a CSI report configuration to one or more second wireless nodes, the measurement configuration indicating one or more side link resource sets to be monitored. The method may also include sending one or more side link reference signals to the one or more second wireless nodes. The method may also include receiving one or more feedback reports from the one or more second wireless nodes, wherein each of the one or more feedback reports may include an ordered sequence of at least one parameter associated with the side link channel quality of the one or more side link reference signals.

[0009] Certain aspects provide a method for wireless communication by a second wireless node. The method generally includes receiving a measurement configuration and a CSI reporting configuration from a base station or a first wireless node, the measurement configuration indicating one or more sidelink resource sets to be monitored, the CSI reporting configuration being associated with the one or more sidelink resource sets, the method also including monitoring a sidelink transmission from the first wireless node via the one or more sidelink resource sets based at least in part on the measurement configuration. The method also includes generating a feedback report based on the CSI reporting configuration, the feedback report including an ordered sequence of at least one parameter associated with a sidelink channel quality of the sidelink transmission, and sending the feedback report to the first wireless node.

[0010] Certain aspects provide a method for wireless communications by a base station. The method generally includes sending a reference signal (RS) configuration indicating one or more sidelink resource sets to a first wireless node, and receiving one or more feedback reports from the first wireless node, wherein each of the feedback reports includes an ordered sequence of at least one parameter associated with a sidelink channel quality of the one or more sidelink reference signals sent by the first wireless node. The method also includes performing one or more actions based on the one or more feedback reports.

[0011] Certain aspects provide an apparatus for wireless communication. The apparatus may include a receiver and a transmitter. The receiver may receive a CSI report configuration from a base station, the CSI report configuration indicating feedback reported associated with one or more side link communication links, wherein the CSI report configuration is associated with one or more side link resource sets. The receiver may receive one or more feedback reports from one or more second wireless nodes, wherein each feedback report in the one or more feedback reports may include an ordered sequence of at least one parameter associated with the side link channel quality of one or more side link reference signals. The transmitter may send a measurement configuration and a CSI report configuration to one or more second wireless nodes, the measurement configuration indicating one or more side link resource sets to be monitored. The transmitter may send one or more side link reference signals to one or more second wireless nodes.

[0012] Certain aspects provide an apparatus for wireless communication. The apparatus may include a receiver, a processing system, a memory, and a transmitter. The receiver may receive a measurement configuration and a CSI report configuration from a base station or a first wireless node, the measurement report indicating one or more side link resource sets to be monitored, and the CSI report configuration is associated with the one or more side link resource sets. The receiver may be configured to monitor a side link transmission from a first wireless node via the one or more side link resource sets based at least in part on the measurement configuration. The processing system and the memory may be configured to generate a feedback report based on the CSI report configuration, the feedback report including a sorted sequence of at least one parameter associated with a side link channel quality of the side link transmission. The transmitter may send the feedback report to the first wireless node.

[0013] Certain aspects provide an apparatus for wireless communications. The apparatus may include components for receiving a channel state information (CSI) reporting configuration from a base station, the CSI reporting configuration indicating reporting feedback associated with one or more sidelink communication links, wherein the CSI reporting configuration is associated with one or more sidelink resource sets; components for sending a measurement configuration and a CSI reporting configuration to one or more wireless nodes, the measurement configuration indicating one or more sidelink resource sets to be monitored; components for sending one or more sidelink reference signals to the one or more wireless nodes; and components for receiving one or more feedback reports from the one or more wireless nodes, wherein each of the one or more feedback reports includes an ordered sequence of at least one parameter associated with a sidelink channel quality of the one or more sidelink reference signals.

[0014] Certain aspects provide an apparatus for wireless communication. The apparatus may include components for receiving a measurement configuration and a CSI reporting configuration from a base station or a first wireless node, the measurement configuration indicating one or more sidelink resource sets to be monitored, the CSI reporting configuration being associated with the one or more sidelink resource sets; components for monitoring a monitored sidelink transmission from the first wireless node via the one or more sidelink resource sets based at least in part on the measurement configuration; components for generating a feedback report based on the CSI reporting configuration, the feedback report including an ordered sequence of at least one parameter associated with a sidelink channel quality of the sidelink transmission; and components for sending the feedback report to the first wireless node.

[0015] Certain aspects provide a computer-readable medium having instructions stored thereon for: receiving a channel state information (CSI) reporting configuration from a base station, the CSI reporting configuration indicating reporting feedback associated with one or more sidelink communication links, wherein the CSI reporting configuration is associated with one or more sidelink resource sets; sending a measurement configuration and a CSI reporting configuration to one or more wireless nodes, the measurement configuration indicating one or more sidelink resource sets to be monitored; sending one or more sidelink reference signals to the one or more wireless nodes; and receiving one or more feedback reports from the one or more wireless nodes, wherein each of the one or more feedback reports includes an ordered sequence of at least one parameter associated with a sidelink channel quality of the one or more sidelink reference signals.

[0016] Certain aspects provide a computer-readable medium having instructions stored thereon, the instructions being used to: receive a measurement configuration and a CSI reporting configuration from a base station or a first wireless node, the measurement configuration indicating one or more side link resource sets to be monitored, the CSI reporting configuration being associated with the one or more side link resource sets; monitor a side link transmission from the first wireless node via the one or more side link resource sets based at least in part on the measurement configuration; generate a feedback report based on the CSI reporting configuration, the feedback report comprising a sorted sequence of at least one parameter associated with a side link channel quality of the side link transmission; and send the feedback report to the first wireless node.

[0017] To achieve the foregoing and related ends, one or more aspects include features fully described below and particularly pointed out in the claims. The following description and the accompanying drawings set forth in detail certain illustrative features of one or more aspects. However, these features indicate only a few of the various ways in which the principles of the various aspects can be employed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order that the manner in which the above-mentioned features of the present disclosure can be understood in detail, a more particular description of what has been briefly summarized above can be made by reference to various aspects, some of which are illustrated in the accompanying drawings. However, it should be noted that the accompanying drawings illustrate only certain typical aspects of the present disclosure and are therefore not to be considered as limiting its scope, as the description may admit of other equally effective aspects.

[0019] Figure 1 is a block diagram conceptually illustrating an example telecommunications system in accordance with certain aspects of the present disclosure.

[0020] Figure 2 is a block diagram conceptually illustrating designs of example base stations (BSs) and user equipment (UEs) in accordance with certain aspects of the present disclosure.

[0021] Figure 3 An example of a frame format for a telecommunications system in accordance with certain aspects of the present disclosure is shown.

[0022] Figure 4 is a call flow diagram illustrating example signaling for reporting sidelink channel state information according to aspects of the present disclosure.

[0023] Figure 5 An example wireless communication network that reports sidelink CSI in accordance with certain aspects of the present disclosure is illustrated.

[0024] Figure 6 An example wireless communication network is illustrated in which sidelink CSI feedback reports may provide transmit and / or receive beam training information in accordance with certain aspects of the present disclosure.

[0025] Figure 7 An example wireless communication network is illustrated in which sidelink CSI feedback reports may provide receive beam training information in accordance with certain aspects of the present disclosure.

[0026] Figure 8 An example wireless communication network is illustrated in which sidelink CSI feedback reports may provide tracking information in accordance with certain aspects of the present disclosure.

[0027] Fig. 9 An example wireless communication network is illustrated in which a UE may enable various sidelink resource pools on another UE in accordance with certain aspects of the present disclosure.

[0028] Fig.10 Example sidelink resource allocations in accordance with certain aspects of the present disclosure are shown.

[0029] Fig.11 is a flow diagram illustrating example operations for wireless communications by a first wireless node in accordance with certain aspects of the present disclosure.

[0030] Fig.12 is a flow diagram illustrating example operations for wireless communications by a second wireless node in accordance with certain aspects of the present disclosure.

[0031] Fig.13 is a flow diagram illustrating example operations for wireless communications by a base station in accordance with certain aspects of the present disclosure.

[0032] Fig.14 A communications device (eg, a wireless node) is shown that may include various components configured to perform operations for the techniques disclosed herein in accordance with aspects of the present disclosure.

[0033] Fig.15 A communication device (eg, a base station) is shown, which may include various components configured to perform operations of the techniques disclosed herein in accordance with aspects of the present disclosure.

[0034] To facilitate understanding, identical reference numerals have been used, where possible, to designate identical elements that are common to the figures. It is contemplated that elements disclosed in one aspect may be beneficially utilized on other aspects without specific recitation. DETAILED DESCRIPTION

[0035] Various aspects of the present disclosure provide an apparatus, method, processing system, and computer-readable medium for reporting sidelink channel state information (CSI). In some wireless communication systems, sidelink CSI feedback may lack a channel quality estimate that enables the BS to allocate resources and / or configure transmit or receive beams for (e.g., using a digital precoder) beamformed multi-UE sidelink communications (e.g., multi-user multiple-input multiple-output (MIMO) transmissions from a UE to other UEs). Various aspects of the present disclosure provide a CSI framework for the sidelink that enables a UE to communicate with multiple UEs based on CSI feedback. For example, a UE may measure a sidelink reference signal and report a sorted sequence of parameters associated with the sidelink channel quality of the sidelink reference signal. The sorted sequence may enable the BS to configure sidelink resources, transmit beams, and / or receive beams that may provide beamformed multi-UE sidelink communications.

[0036] The following description provides an example of reporting side link channel state information in a communication system, and does not limit the scope, applicability or examples set forth in the claims. Without departing from the scope of the present disclosure, the functions and arrangements of the elements discussed may be changed. Various examples may appropriately omit, replace or add various processes or components. For example, the described method may be performed in a different order than described, and various steps may be added, omitted or combined. In addition, the features described with respect to some examples may be combined in some other examples. For example, any number of aspects set forth herein may be used to implement a device or practice method. In addition, the scope of the present disclosure is intended to cover such a device or method, which is practiced using other structures, functions or structures and functions in addition to or different from the various aspects of the present disclosure set forth herein. It should be understood that any aspect of the present disclosure disclosed herein may be embodied by one or more elements of the claims. The word "exemplary" is used herein to mean "used as an example, instance or illustration" Any aspect described herein as "exemplary" is not necessarily interpreted as being preferred or advantageous over other aspects.

[0037] Typically, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a specific radio access technology (RAT) and can operate on one or more frequencies. RAT may also be referred to as radio technology, air interface, etc. Frequency may also be referred to as carrier, subcarrier, frequency channel, tone, subband, etc. Each frequency may support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, a 5G NR RAT network may be deployed.

[0038] Figure 1 An example wireless communication network 100 is shown in which aspects of the present disclosure may be performed. The wireless communication network 100 may be an NR system (e.g., a 5G NR network). According to aspects of the present disclosure, UE 120a includes a sidelink manager 122a that sends a sidelink reference signal, receives a sidelink feedback report from UE 120b based on the sidelink reference signal, and in some cases, sends a sidelink communication to another UE (e.g., UE 120b) based on the sidelink feedback report. According to aspects of the present disclosure, UE 120b includes a sidelink manager 122b that monitors the sidelink reference signal sent by UE 120a and sends a sidelink feedback report associated with the sidelink reference signal to UE 120a. According to aspects of the present disclosure, BS 110a includes a sidelink manager 112 that configures sidelink resources for CSI feedback, receives feedback reports from UE 120a, and performs one or more actions based on the feedback reports.

[0039] like Figure 1As shown, the wireless communication network 100 may include multiple base stations (BSs) 110a-z (each BS is also referred to herein individually as BS 110 or collectively as BS 110) and other network entities. BS 110 may provide communication coverage for a particular geographic area (sometimes referred to as a "cell"), which may be fixed or may move depending on the location of the mobile BS 110. In some examples, BS 110 may be interconnected to each other and / or to one or more other BSs or network nodes (not shown) in the wireless communication network 100 through various types of backhaul interfaces (e.g., direct physical connections, wireless connections, virtual networks, etc.) using any suitable transport network. Figure 1 In the example shown, BSs 110a, 110b, and 110c may be macro BSs of macro cells 102a, 102b, and 102c, respectively. BS 110x may be a pico BS of a pico cell 102x. BSs 110y and 110z may be femto BSs of femto cells 102y and 102z, respectively. A BS may support one or more cells. BS 110 communicates with user equipment (UE) 120a-y (each UE is also referred to herein as UE 120 individually or collectively as UE 120) in a wireless communication network 100. UEs 120 (e.g., 120x, 120y, etc.) may be dispersed throughout the wireless communication network 100, and each UE 120 may be fixed or mobile.

[0040] The wireless communication network 100 may also include a relay station (e.g., relay station 110r), also referred to as a relay, etc., which receives transmissions of data and / or other information from an upstream station (e.g., BS 110a or UE 120r) and sends transmissions of data and / or other information to a downstream station (e.g., UE 120 or BS 110), or relays transmissions between UEs 120 to facilitate communication between devices.

[0041] A network controller 130 may couple to a set of BSs 110 and provide coordination and control for these BSs 110. The network controller 130 may communicate with the BSs 110 via a backhaul. The BSs 110 may also communicate with each other (eg, directly or indirectly) via a wireless or wired backhaul.

[0042] Figure 2 Example components of BS 110a and UE 120a are shown (eg, in Figure 1 In the wireless communication network 100), it can be used to implement various aspects of the present disclosure.

[0043] At BS 110a, a transmit processor 220 may receive data from a data source 212 and control information from a controller / processor 240. The control information may be for a physical broadcast channel (PBCH), a physical control format indicator channel (PCFICH), a physical hybrid ARQ indicator channel (PHICH), a physical downlink control channel (PDCCH), a group common PDCCH (GC PDCCH), etc. The data may be for a physical downlink shared channel (PDSCH), etc. The processor 220 may process (e.g., encode and symbol map) the data and the control information to obtain data symbols and control symbols, respectively. The transmit processor 220 may also generate reference symbols, such as for a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a cell-specific reference signal (CRS). If applicable, a transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​the data symbols, control symbols, and / or reference symbols, and may provide an output symbol stream to a modulator (MOD) 232a-232t. Each modulator 232 may process a corresponding output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator may also process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. The downlink signals from modulators 232a-232t may be transmitted via antennas 234a-234t, respectively.

[0044] At UE 120a, antennas 252a-252r can receive downlink signals from BS 110a and can provide received signals to demodulators (DEMODs) in transceivers 254a-254r, respectively. Each demodulator 254 can condition (e.g., filter, amplify, downconvert, and digitize) a corresponding received signal to obtain input samples. Each demodulator 254 can also process the input samples (e.g., for OFDM, etc.) to obtain received symbols. MIMO detector 256 can obtain received symbols from all demodulators in transceivers 254a-254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols. Receive processor 258 can process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for UE 120a to data sink 260, and provide decoded control information to controller / processor 280.

[0045] On the uplink, at the UE 120a, a transmit processor 264 may receive and process data from a data source 262 (e.g., a physical uplink shared channel (PUSCH)) and control information from a controller / processor 280 (e.g., a physical uplink control channel (PUCCH)). The transmit processor 264 may also generate reference symbols for reference signals (e.g., a sounding reference signal (SRS)). The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266, if applicable, further processed by a demodulator in the transceiver 254a-254r (e.g., for SC-FDM, etc.), and transmitted to the BS 110a. At the BS 110a, the uplink signal from the UE 120a may be received by the antenna 234, processed by the modulator 232, detected by the multi-MIMO detector 236, and further processed by the receive processor 238 to obtain decoded data and control information transmitted by the UE 120a. Receive processor 238 may provide decoded data to a data sink 239 and decoded control information to controller / processor 240 .

[0046] Memories 242 and 282 may store data and program codes for BS 110a and UE 120a, respectively.A scheduler 244 may schedule UEs for data transmission on the downlink and / or uplink.

[0047] The controller / processor 280 and / or other processors and modules at the UE 120a may perform or direct the execution of processes for the techniques described herein. Figure 2 As shown, according to aspects of the present disclosure, the controller / processor 240 of the BS 110 has a sidelink manager 241 that configures sidelink resources for CSI feedback, receives feedback reports from the UE 120a, and performs one or more actions based on the feedback reports. Figure 2 As shown, according to aspects of the present disclosure, the controller / processor 280 of UE 120 has a sidelink manager 241 that sends a sidelink reference signal, receives a sidelink feedback report from another UE based on the sidelink reference signal, and forwards the feedback report to BS 110. In certain aspects, according to aspects of the present disclosure, the sidelink manager 241 can monitor the sidelink reference signal sent by another UE and send a feedback report associated with the sidelink reference signal to the other UE. Although shown at the controller / processor, other components of UE 120a and BS 110a can be used to perform the operations described herein.

[0048] Figure 3300 is a diagram showing an example of a frame format 300 for NR. The transmission timeline for each of the downlink and uplink may be divided into units of radio frames. Each radio frame may have a predetermined duration (e.g., 10 ms) and may be divided into 10 subframes, each 1 ms, indexed from 0 to 9. Depending on the subcarrier spacing, each subframe may include a variable number of slots. Depending on the subcarrier spacing, each slot may include a variable number of symbol periods (e.g., 7, 12, or 14 symbols). The symbol periods in each slot may be assigned an index. A mini-slot, which may be referred to as a subslot structure, refers to a transmission time interval (e.g., 2, 3, or 4 symbols) having a duration less than one slot.

[0049] Each symbol in a slot may indicate a link direction (e.g., downlink (DL), uplink (UL), or flexible) for data transmission, and the link direction of each subframe may be switched dynamically. The link direction may be based on the slot format. Each slot may include DL / UL data and DL / UL control information. In certain aspects, sidelink transmissions (e.g., transmissions between UEs) may use DL and / or UL time domain resources.

[0050] In NR, a synchronization signal (SS) block is transmitted. The SS block includes PSS, SSS, and dual-symbol PBCH. It can be transmitted at fixed time slot positions, such as Figure 3 SS blocks are sent in symbols 0-3 as shown. The UE can use PSS and SSS for cell search and acquisition. PSS can provide half-frame timing, and SS can provide CP length and frame timing. PSS and SSS can provide cell identification. PBCH carries some basic system information, such as downlink system bandwidth, timing information within radio frames, SS burst set periodicity, number of system frames, etc. SS blocks can be organized into SS bursts to support beam scanning. In certain subframes, further system information, such as remaining minimum system information (RMSI), system information block (SIB), other system information (OSI), can be sent on the physical downlink shared channel (PDSCH). For example, for millimeter waves, SS blocks can be sent up to 64 times with up to 64 different beam directions. SS blocks sent up to 64 times are called SS burst sets. SS blocks in an SS burst set are sent in the same frequency region, while SS blocks in different SS burst sets can be sent at different frequency locations.

[0051] Example of channel state information based on sidelink

[0052] In some cases, two or more slave entities (e.g., UEs) can communicate with each other using sidelink signals. Real-world applications of such sidelink communications may include public safety, proximity services, UE-to-network relay, vehicle-to-vehicle (V2V) communications, Internet of Everything (IoE) communications, Internet of Things (IoT) communications, mission-critical grids, and / or various other suitable applications. In general, a sidelink signal may refer to a signal that is communicated from one slave entity (e.g., UE1) to another slave entity (e.g., UE2) without relaying the communication through a scheduling entity (e.g., UE or BS), although the scheduling entity may be used for scheduling and / or control purposes. In some examples, a licensed spectrum (unlike wireless local area networks that typically use unlicensed spectrum) may be used to communicate sidelink signals.

[0053] Various sidelink channels can be used for sidelink communications, including the physical sidelink discovery channel (PSDCH), the physical sidelink control channel (PSCCH), the physical sidelink shared channel (PSSCH), and the physical sidelink feedback channel (PSFCH). The PSDCH can carry discovery expressions. For example, near-end devices can use the PSDCH to discover each other.

[0054] The PSCCH may carry control signaling such as sidelink resource configuration and other parameters for data transmission.Before decoding the PSCCH, the starting symbol and number of symbols of the PSCCH may be assumed to be known to the receiving UE.

[0055] The PSSCH may carry data transmissions, and a UE may send or receive data transmissions in a timeslot on the carrier. In some aspects, all symbols in a timeslot may be used for sidelink data transmissions, or only a subset of consecutive symbols in a timeslot may be used for sidelink data transmissions.

[0056] The PSFCH may carry feedback, such as channel state information related to the sidelink channel quality. In some cases, the PSFCH may use a sequence-based PSFCH format with one symbol (excluding the automatic gain control training period). The PSFCH format may be based on the physical uplink control channel format (e.g., format 2). In some aspects, the PSFCH format may span all available symbols for the sidelink in a timeslot.

[0057] The sidelink bandwidth part (BWP) configuration may be separate from the DL / UL BWP configuration signaling. As used herein, the DL / UL BWP may also be referred to as the UTRAN / UE (Uu) BWP or air interface. The UE may not be expected to use different sets of parameters (numerology) in the configured SL BWP and active UL BWP in the same carrier at a given time. In a licensed carrier, the SL BWP may be configured separately from the DL / UL BWP. The same SL BWP may be used for both sending and receiving. For the time domain resources of the PSSCH, the resource pool may include non-continuous time domain resources. For the frequency domain resources of the PSSCH, the resource pool may include continuous physical resource blocks (PRBs) or non-continuous PRBs. Sidelink communications may be communicated via cyclic prefix OFDM (CP-OFDM). The UE may report an indication of resources to the BS via the Uu air interface to retransmit the sidelink transport block (TB) sent by the UE.

[0058] In wireless communication, CSI may refer to a known channel property of a communication link. CSI may represent, for example, a combined effect of dispersion, fading, and power attenuation as the distance between the transmitter and the receiver decreases. Channel estimation may be performed to determine these effects on the channel. CSI may be used to adapt transmission based on current channel conditions, which is useful for achieving reliable communication, particularly reliable communication with high data rates in multi-antenna systems. CSI is typically estimated, quantized, and fed back to the transmitter at the receiver. As an example, CSI may include a channel quality indicator (CQI), a precoding matrix indicator (PMI), a CSI-RS resource indicator (CRI), a SS / PBCH block resource indicator (SSBRI), a layer indicator (LI), a rank indicator (RI), and / or an L1 reference signal received power (L1-RSRP).

[0059] In some cases, the sidelink channel quality can be estimated via CSI feedback. Sidelink CSI reporting can be enabled and disabled by control signaling such as radio resource control (RRC) signaling, downlink control information (DCI), media access control (MAC) signaling (e.g., MAC control element (MAC-CE)). Sidelink CSI feedback can provide CQI / RI measurements for no more than two CSI-RS antenna ports. The sidelink CSI-RS can be within the PSSCH transmission. One of two modes can be used to configure the sidelink CSI. In the first mode, the BS can configure and schedule sidelink resource allocations (e.g., CSI resources) to all UEs participating in the sidelink communication. In the second mode, the BS can configure and schedule sidelink resource allocations (e.g., CSI resources) to at least one UE, and then the at least one UE forwards the sidelink resource allocations to other UEs via the sidelink communication channel. The second mode can be used for situations where some UEs are not within the coverage of the BS transmission, but within the coverage of the sidelink transmission of at least one UE.

[0060] In certain wireless communication systems (e.g., 5G NR systems), sidelink CSI feedback may lack channel quality estimates that enable a BS to allocate resources for beamformed multi-UE sidelink communications (e.g., multi-user MIMO transmissions from a UE to other UEs) (e.g., using a digital precoder). For example, the sidelink CSI feedback may lack channel quality estimates associated with multiple transmit beams and / or receive beams. In other aspects, the sidelink CSI feedback may lack channel quality estimates for sidelink precoding, such as a precoding matrix indicator (PMI) and / or a rank indicator (RI).

[0061] Various aspects of the present disclosure provide a sidelink CSI framework that enables a UE to communicate with multiple UEs based on CSI feedback. For example, a BS may configure a first UE to send one or more periodic or semi-persistent sidelink reference signal (RS) resource sets (each resource set having one or more RS resources). The BS may also configure the first UE to report sidelink CSI feedback based on a set of parameters. For example, a CSI report configuration may be associated with a configured RS resource set. One or more second UEs may receive a sidelink CSI report configuration (directly from the BS or via either of the first UEs) to measure all (or a subset) of the sidelink resource sets sent by the first UE by configuring measurement resources associated with the report configuration, the report configuration indicating, for example, what parameters to report, how often the sidelink CSI is reported, and via which channel. Each of the second UEs may measure the sidelink RS and report a sorted sequence of parameters associated with the sidelink channel quality (e.g., a sounding reference signal indicator (SRI), CRI, a transmit PMI (TPMI), and / or a transmit RI (TRI)). The first UE may aggregate the sidelink CSI reports received from the second UE into a data packet and report the sidelink CSI feedback to the BS via PUSCH or long PUCCH, for example, based on periodic configuration or DCI triggering. In some aspects, the BS may configure or trigger the first UE to send sidelink communications via PSCCH / PSSCH based on the sidelink feedback. For example, if the sidelink feedback indication SRI=1 provides a suitable sidelink air interface for most second UEs, the BS may configure the first UE to communicate with the second UE via PSCCH / PSSCH with SRI=1.

[0062] Figure 4 is a call flow diagram illustrating example operations 400 for reporting sidelink CSI in accordance with certain aspects of the present disclosure. At 402, UE 120a may receive a sidelink RS configuration from BS 110 indicating one or more sidelink resource sets that may be used to transmit sidelink RS to other UEs, such as UE 120b.

[0063] At 404, UE 120a may receive a CSI reporting configuration from BS 110, the CSI reporting configuration indicating reporting feedback associated with a sidelink communication link (e.g., a sidelink air interface between UE 120a and UE 120b). For example, the CSI reporting configuration may be associated with at least one of the one or more sidelink resource sets, which may indicate that UE 120a reports to the BS any feedback reports associated with RS transmissions received from other UEs (e.g., UE 120b). In certain aspects, BS 110 may generate the CSI reporting configuration prior to sending the configuration to UE 120a.

[0064] In certain aspects, at 406a, UE 120b may receive a measurement configuration and a CSI report configuration from BS 110, the measurement configuration indicating one or more side link resource sets to be monitored, the CSI report configuration being associated with the one or more side link resource sets. The measurement configuration may indicate whether a specific CSI report configuration is enabled or disabled. In other aspects, at 406b, UE 120b may receive two configurations from UE 120a, and UE 120a may forward the configuration from BS 110. For example, if UE 120b is within the cell coverage of BS 110, BS 110 may provide the configuration directly to UE 120b. In other cases, if UE 120b is outside the cell coverage of BS 110, the configuration may be forwarded to UE 120b via UE 120a.

[0065] UE 120b may determine one or more sidelink resource sets to monitor based on a measurement configuration, where the measurement configuration may indicate which sidelink resource sets to monitor. The CSI reporting configuration received at 406a / b may indicate to UE 120b which parameters associated with sidelink channel quality (e.g., RSRP, received signal strength indicator (RSSI), signal to noise and interference ratio (SINR), TPMI, TRI, CRI, SRI, or sidelink resource set indicator) to measure and report.

[0066] At 408, UE 120a may send one or more sidelink RSs to UE 120b. UE 120a may send one or more sidelink RSs to UE 120b based at least in part on the RS configuration received at 402. At 410, UE 120b may generate a feedback report based on the CSI report configuration received at 406a / b, the feedback report including a sorted sequence of at least one parameter associated with the sidelink channel quality of the sidelink RS transmission. The sorted sequence of parameters may be sorted based on the sidelink channel quality associated with one or more transmit beams, one or more receive beams, or one or more sidelink resource sets. For example, the feedback report may indicate the sidelink channel quality of one or more receive beams used to monitor the sidelink RS transmission. In other cases, the feedback report may indicate the sidelink channel quality of one or more transmit beams used to send the sidelink RS transmission. In other cases, the feedback report may indicate the sidelink channel quality of one or more sidelink resource sets.

[0067] At 412, UE 120b may send a feedback report to UE 120a based at least in part on the CSI reporting configuration. For example, UE 120b may send the feedback report via the sidelink data or control resource pool indicated in the CSI reporting configuration received at 406a / b. UE 120a may also receive the feedback report via the control resource pool indicated in the CSI reporting configuration received at 404.

[0068] At 414, UE 120a may forward the feedback report to BS 110, for example, using the uplink resource pool indicated in the CSI report configuration received at 404. BS 110 may perform one or more actions based on the feedback report. At 416, BS 110 may send a resource allocation to UE 120a for sidelink communication based on the feedback report, and at 418, BS 110 may send a resource allocation to UE 120b for sidelink communication based on the feedback report. For example, the ordered sequence of parameters may enable BS 110 to configure one or more transmit beams, one or more receive beams, and / or one or more sidelink resource sets that provide suitable channel quality (e.g., spectral efficiency associated with one or more transmit beams, one or more receive beams, or one or more sidelink resource sets, throughput value, spectral efficiency per energy unit, or SINR) on the sidelink air interface between UE 120a and 120b.

[0069] Figure 5An example wireless communication network 500 for reporting sidelink CSI according to certain aspects of the present disclosure is shown. BS 110 may configure UE 120a to transmit sidelink RS to UE 120b-e and report sidelink CSI feedback from UE 120b-e. The sidelink CSI feedback from each of UEs 120b-e may be an ordered sequence of parameters associated with one or more resource sets, one or more transmit beams, and / or one or more receive beams. For example, the ordered sequence may include an RSRP for each of the sidelink RS resource sets (e.g., an SRS resource set indicated by an SRI). Based on the ordered sequence of parameters, BS 110 may configure one or more transmit beams, one or more receive beams, and / or one or more resource sets that provide suitable sidelink channel quality (e.g., spectral efficiency, throughput value, spectral efficiency per energy unit, or SINR associated with one or more transmit beams, one or more receive beams, or one or more resource sets) for one or more of UEs 120a-e. For example, if the sidelink CSI feedback indicates that the SRS resources associated with a given SRS resource indicator (e.g., SRI=1) provide a suitable sidelink air interface (e.g., RSRP above a given threshold) for most of the UEs 120b-e, the BS 110 may configure the UE 120a to communicate with the UEs 120b-e via the PSCCH / PSSCH having the SRS resources associated with the SRS resource indicator.

[0070] Figure 6 An example wireless communication network 600 is shown in accordance with certain aspects of the present disclosure, in which a sidelink CSI feedback report may provide transmit and / or receive beam training information. The BS 110 may configure a plurality of RS resources 602 (e.g., a first RS resource 602a, a second RS resource 602b, a third RS resource 602c, and a fourth RS resource 602d) in a non-codebook based RS resource set (or an uplink beam management (UL BM) set) for the UE 120a. For example, each RS resource 602 may have a duration of four OFDM symbols. The BS 110 may configure the UE 120b-e to measure each RS resource in the RS resources 602. The UE 120a may transmit via each RS resource in the RS resources 602 using a different transmit beam 604. The UE 120b-e may measure each RS resource in the RS resources 602 via a different receive beam 606. UE 120b-e may generate feedback reports that provide information associated with channel quality for each of the transmit / receive beam pairs.

[0071] Figure 7An example wireless communication network 700 is shown in accordance with certain aspects of the present disclosure, in which a sidelink CSI feedback report may provide receive beam training information. For example, BS 110 may configure a codebook-based RS resource set with a single RS resource 702 for UE 120a. RS resource 702 may have a duration of, for example, four symbols. BS 110 may configure UE 102b-e to measure RS resource 702. UE 120b-e may measure RS resource 702 via different receive beams 606 and generate a feedback report that provides channel quality for each receive beam in the receive beam. In some cases, UE 120a may send a sidelink RS via RS resource 702 using an omnidirectional radiation pattern. In other cases, UE 120a may send an SRS to BS 110 via RS resource 702, and UE 120b-e may monitor the SRS transmission.

[0072] Figure 8 An example wireless communication network 800 is shown in accordance with certain aspects of the present disclosure, in which a sidelink CSI feedback report may provide tracking information. For example, the BS 110 may configure the UE 120a with an RS resource set 802 for tracking purposes. The RS resource set 802 may include at least two RS resources 812 that are in the same time slot 810 and are not contiguous with each other. That is, the RS resources 812 may be offset from each other in the same time slot 810. Each of the two RS resources 812 may include one or more consecutive OFDM symbols. The BS 110 may configure the UE 120b-e to measure the RS resources 812. For example, the UE 120b-e may determine tracking information associated with the RS resources 812 based on the monitored RS resources 812, such as quasi-co-location (QCL) parameters, including Doppler shift, Doppler spread, delay spread, and average delay of PSCCH / PSSCH. If UE 120a transmits multiple tracking RS resource sets, UEs 120b-e may generate feedback reports that order the parameters 802 according to the channel quality of the RS resource sets. That is, the sidelink CSI feedback reports may be ordered at the resource set level.

[0073] Fig. 9An example wireless communication network 900 is shown in accordance with certain aspects of the present disclosure, in which a UE may enable various sidelink resource pools on another UE. UE 120a may use a sidelink channel such as PSSCH / PSCCH to send RS measurement configuration and CSI reporting configuration to UE 120b via an RRC message or a MAC CE. For example, UE 120a may use TX resource pool 1902 to send data to UE 120b, and UE 120b may receive data transmission via RX resource pool 1 904. The RS measurement configuration may enable UE 120b to monitor RX resource pool 1 904 and generate CSI feedback associated with TX resource pool 1 902 transmissions. In the case of non-periodic CSI reporting, UE 120a may send a PSCCH to UE 120b, which includes a CSI trigger that enables CSI monitoring and reporting to UE 120b. For example, UE 120a may send a DCI message via TX resource pool 1 902 with a CSI request field that triggers reporting to RX resource pool 2 906 of UE 120b.

[0074] Fig.10 Example sidelink resource allocations according to certain aspects of the present disclosure are shown. In certain aspects, UE 120b and 120c may be outside the cell coverage of BS 110, and UE 120a may receive a downlink control message 1002 from BS 110 indicating a sidelink resource configuration within a downlink resource pool 1010 (e.g., DLBWP) having time domain and frequency domain resources. For example, UE 120a may forward the sidelink resource configuration to UE 120b and 120c via sidelink control resources 1004. In other aspects, UE 120a-c may be within the cell coverage of BS 110, and in such a case, UE 120a-c may receive a downlink control message 1002 from BS 110 that directly provides the sidelink resource configuration for UE 120a-c.

[0075] The sidelink resource configuration can provide sidelink control and data resources in an uplink resource pool 1020 (e.g., ULBWP) with time domain and frequency domain resources. That is, in some cases, the uplink resources may include resources for sidelink communication. For example, the sidelink resource configuration may include sidelink control resources 1004 and sidelink data resources 1006. UE 120a may communicate with UE 120b and 120c via sidelink control resources 1004 and sidelink data resources 1006. For example, UE 120a may send various configurations (e.g., measurement configuration and CSI report configuration described herein) via sidelink control resources 1004. In other cases, UE 120a may send sidelink CSI report feedback via sidelink control resources 1004 and / or sidelink data resources 1006.

[0076] In some cases, a sidelink RS and a RS resource set of resources indicated in the corresponding CSI report configuration may be configured within the sidelink BWP. Similar RS resource sets may be defined with a Uu BWP and associated with communication-based use cases dedicated to Uu, such as codebook-based transmissions, non-codebook-based transmissions, or uplink beam management transmissions. Whenever a UE is configured with two RS configurations in both BWP-SL and BWP-Uu, which may result in the same RS transmission, the UE may be expected to transmit one RS that is used for both purposes. For example, one or more sidelink RSs may also be used as a sounding reference signal (SRS) for uplink transmissions to BS 110. In other words, the SRS sent to BS 110 may be used as a sidelink RS for sidelink CSI feedback as described herein.

[0077] In certain aspects, a set of RS resources may be within a Uu BWP and dedicated to codebook-based, non-codebook-based, or UL BM transmissions. A CSI report may be defined within a sidelink BWP and associated with the RS resources of the Uu BWP. A UE may determine that such a set of RS resources is being measured by other UEs, which will report sidelink CSI parameters to the UE based on the RS resources.

[0078] An RS resource set may have multiple resources, each pointing in a different direction to provide transmit beam training information. Multiple RS resource sets may be configured. In some aspects, only one RS resource set (e.g., a codebook-based or non-codebook-based UL RS resource set) may be used to communicate with the Uu gNB.

[0079] Fig.111 is a flow diagram illustrating example operations 1100 for wireless communications in accordance with certain aspects of the present disclosure. Operations 1100 may be performed, for example, by a wireless node such as a first wireless node (e.g., UE 120a). Operations 1100 may be implemented as a process on one or more processors (e.g., Figure 2 In addition, in operation 1100, the UE may transmit and receive signals, for example, through one or more antennas (e.g., Figure 2 In some aspects, the transmission and / or reception of signals by the UE may be implemented via a bus interface of one or more processors (e.g., controller / processor 280) that obtain and / or output signals. As used herein, a wireless node may refer to a wireless communication device, such as a UE or vehicle in a V2X application.

[0080] Operation 1100 may optionally begin at 1102, where a first wireless node may receive an RS configuration indicating one or more sidelink resource sets from a base station (e.g., BS 110). At 1104, the first wireless node may receive a CSI report configuration from the BS, the CSI report configuration indicating reporting feedback associated with one or more sidelink communication links. The CSI report configuration may be associated with one or more sidelink resource sets. At 1106, the first wireless node may send a measurement configuration and a CSI report configuration to one or more second wireless nodes (e.g., UE 120b-e), the measurement configuration indicating one or more sidelink resource sets to be monitored. At step 1108, the first wireless node may send one or more sidelink RSs (e.g., SRSs and / or CSI-RSs) to the one or more second wireless nodes. The first wireless node may send one or more sidelink RSs to the one or more second wireless nodes based at least in part on the RS configuration. At 1110, the first wireless node may receive one or more feedback reports from the one or more second wireless nodes. Each feedback report may include a sorted sequence of at least one parameter associated with the sidelink channel quality of the sidelink RS. Optionally, at 1112, the first wireless node may forward one or more feedback reports to the BS.

[0081] The sorted sequence of the parameter may be sorted such that a first value of the parameter may provide suitable channel quality based on a given metric between a first wireless node and a second wireless node. Next values ​​in the sorted sequence may provide equal or reduced channel quality based on the given metric. For example, the sorting may be such that if a first value of the reported parameter is used for transmission, then the corresponding spectral efficiency is higher (e.g., a higher CQI per layer) relative to a second value of the parameter, and the second value may provide higher spectral efficiency relative to a third value in the sequence.

[0082] If multiple parameters are reported, the sorting may be performed in tuples. That is, the sorting sequence of parameters may include multiple tuples sorted based on the side link channel state quality associated with at least one side link resource set or one of the side link resource sets in the side link resource set. For example, the sorting sequence may be a sorting sequence of tuples, such as (RI1, PMI1, CQI1), (RI2, PMI2, CQI2), (RI3, PMI3, CQI3). Each tuple may be associated with a different transmit beam, receive beam, set of RS resources and / or RS resource sets. The sorting of tuples may be based on one or more parameters in the tuple or the side link channel quality, such as CQI1>CQI2>CQI3, or CQI1*RI1>CQI2*RI2>CQI3*RI3. The sorting sequence may indicate a transmit beam, receive beam, resource and / or RS resource set with the best side link channel quality. In some aspects, the transmit beam and receive beam characteristics of the sorting sequence may be implicitly conveyed. That is, a transmit beam and / or a receive beam may be associated with different RS resources and / or resource sets.

[0083] The sorting sequence of at least one parameter includes multiple parameter values, each parameter value is associated with at least one of a transmit beam, a receive beam, a side link resource, or a side link resource set. The sorting sequence of parameters can be sorted based on the side link channel quality associated with one or more transmit beams, one or more receive beams, one of the resources of the side link resource set, or at least one of the side link resource set. The side link channel quality can be determined based on various metrics such as spectral efficiency, throughput, spectral efficiency per energy unit, SINR, etc. In other words, the sorting sequence of parameters can be sorted based on at least one of the spectral efficiency, throughput value, spectral efficiency per energy unit, or SINR associated with one or more transmit beams, one or more receive beams, one of the resources of the side link resource set, or at least one of the side link resource set. For example, the parameters associated with the side link resource (corresponding to the transmit beam and / or receive beam) that provides the maximum spectral efficiency can be sorted as the first value set in the sorting sequence, and the next value set can be used for parameters associated with different side link resources (corresponding to different transmit beams and / or receive beams) that provide equal or lower spectral efficiency. The at least one parameter may include at least one of RSRP, RSSI, SINR, TPMI, TRI, CRI, SRI, or a sidelink resource set indicator.

[0084] Operation 1100 may also include the first wireless node receiving a CSI reporting configuration from a base station, such as described herein with respect to Figure 4The CSI reporting configuration may indicate to the first wireless node to report feedback associated with the sidelink communication link. The CSI reporting configuration may be associated with one or more sidelink resource sets, which may indicate to the first wireless node to report any feedback reports received from other wireless nodes and associated with RS transmissions.

[0085] The first wireless node may forward one or more feedback reports to the base station based on the CSI reporting configuration. For example, the CSI reporting configuration may indicate one or more resources for forwarding feedback to the base station and / or receiving feedback from one or more second wireless nodes. That is, the CSI reporting configuration may provide a first set of resources for receiving feedback reports from the second wireless node and / or a second set of resources for reporting feedback reports to the base station. The one or more resources indicated in the CSI reporting configuration may be within one or more sidelink bandwidth parts (BWPs).

[0086] In certain aspects, one or more sidelink resource sets used for sidelink RS transmission may be within one or more sidelink BWPs. In other aspects, one or more sidelink resource sets and one or more resources indicated in a CSI reporting configuration may be within one or more sidelink BWPs.

[0087] In some cases, the sidelink RS configuration may configure RS resources that are consistent with RS resources associated with a BS-UE (Uu) air interface or BWP. If a UE is configured with multiple RS configurations, at least one of which is in a sidelink BWP and another in a Uu BWP, which results in the same RS transmission, the UE may be expected to transmit one RS for two purposes (sidelink and uplink measurements). For example, operation 1100 may include a first wireless node determining that the first wireless node is configured with multiple RS configurations, including an RS configuration in a sidelink BWP and another RS ​​configuration in an uplink BWP. The first wireless node may determine a resource set for RS transmission based on the multiple RS configurations, and send one or more reference signals to a base station and one or more second wireless nodes via the determined resource set.

[0088] In certain aspects, one or more sidelink resource sets for sidelink RS transmission may be within a Uu BWP, such as a UL BWP, e.g., as described herein with respect to Fig.10In some cases, the CSI reporting configuration may indicate resources for receiving feedback in a sidelink BWP, and the CSI reporting configuration may be associated with one or more sidelink resource sets within the Uu BWP. For example, operation 1100 may include a first wireless node receiving a CSI reporting configuration from a base station, the CSI reporting configuration indicating reporting feedback associated with a sidelink communication link, wherein the CSI reporting configuration is associated with one or more sidelink resource sets and indicates resources in the sidelink BWP.

[0089] The RS configuration and / or CSI report configuration may indicate the resource type of one or more side link resource sets. For example, the RS configuration and / or CSI report configuration may indicate whether at least one of the side link resource sets is periodic, semi-persistent, or aperiodic. In some aspects, the side link CSI feedback may be reported aperiodically. For example, a first wireless node may send an aperiodic CSI trigger to one or more second wireless nodes. The aperiodic CSI trigger may include a downlink control information (DCI) message that includes a CSI request field. The RS configuration may also indicate whether at least one of the side link resource sets is used for uplink beam management, codebook-based transmission, or non-codebook-based transmission.

[0090] Each of the one or more side link resource sets may include one or more side link resources, and each resource may include one or more symbols. In some cases, different transmit beams may be used for different side link resources. That is, the first wireless node may transmit different side link resources via different transmit beams, for example, as described herein with respect to Figure 6 For example, each side link resource of at least one side link resource set may correspond to a different transmission configuration indication (TCI) state or a different quasi-co-location (QCL) relationship associated with a spatial reception parameter, which may indicate that the first wireless node uses different transmit beams for different side link resources.

[0091] In certain aspects, the sidelink CSI feedback report may provide tracking information, for example, as described herein with respect to Figure 8 As described. As an example, at least one of the side link resource sets may include at least two side link resources that are in the same time slot and are discontinuous with respect to the time domain resources. Each of the at least two side link resources may include one or more consecutive OFDM symbols. The at least two side link resources may be in the same bandwidth and correspond to the same uplink antenna port.

[0092] In some cases, the first wireless node may forward the measurement configuration and the CSI reporting configuration to one or more second wireless nodes. For example, when the one or more second wireless nodes are outside the cell coverage of the base station, the first wireless node may forward these configurations. Operation 1100 may include the first wireless node receiving a measurement configuration and a CSI reporting configuration of the one or more second wireless nodes from the base station, the measurement configuration indicating which side link resource sets the one or more second wireless nodes are to monitor, wherein the CSI reporting configuration is associated with the one or more side link resource sets. The first wireless node may forward the measurement configuration and the CSI reporting configuration to the one or more second wireless nodes via a side link control or data channel resource pool, for example, as described herein with respect to Fig.10 The CSI reporting configuration of the second wireless node may indicate at least one parameter to be reported to the first wireless node. The first wireless node may send the measurement configuration and / or the CSI reporting configuration via RRC signaling (e.g., RRC message) and / or MAC signaling (e.g., MAC-CE).

[0093] The measurement configuration of the second wireless node may indicate that one or more second wireless nodes use different receive beams to monitor the side link resources. For example, the measurement configuration may indicate that one or more side link reference signals are to be sent at multiple time domain resources using the same spatial transmit filter. The second wireless node may determine to use different receive beams at different time domain resources (e.g., time slots) based on RSs transmitted via the same spatial filter.

[0094] The first wireless node may receive the feedback report via various air interfaces. For example, the first wireless node may receive the feedback report via at least one of the long format PSFCH, PSCCH, or PSSCH. The channel selected for transmitting the feedback report may depend on various factors, including the size of the feedback report and / or whether ACK / NACK feedback is enabled.

[0095] Fig.12 1 is a flow diagram illustrating example operations 1200 for wireless communications in accordance with certain aspects of the present disclosure. Operations 1200 may be performed, for example, by a wireless node (e.g., UE 120b-e). Operations 1200 may be implemented as a processor (e.g., Figure 2 In addition, in operation 1200, the UE may transmit and receive signals, for example, through one or more antennas (e.g., Figure 2 In some aspects, the transmission and / or reception of signals by the UE may be implemented via a bus interface of one or more processors (eg, controller / processor 280) that obtain and / or output signals.

[0096] Operations 1200 may begin at 1202, where a second wireless node receives a measurement configuration and a CSI reporting configuration from a base station (e.g., BS 110) or a first wireless node (e.g., UE 120a), the measurement configuration indicating one or more sidelink resource sets to be monitored, the CSI reporting configuration being associated with the one or more sidelink resource sets. At 1204, the second wireless node may monitor a sidelink transmission from the first wireless node via the one or more sidelink resource sets based at least in part on the measurement configuration. At 1206, the second wireless node may generate a feedback report based on the CSI reporting configuration, the feedback report including an ordered sequence of at least one parameter associated with a sidelink channel quality of the sidelink transmission. At 1208, the second wireless node may send the feedback report to the first wireless node.

[0097] The CSI reporting configuration indicates at least one parameter to be reported to the first wireless node. The second wireless node may generate an ordered sequence of at least one parameter according to various formats as described herein with respect to operation 1100. For example, the ordered sequence of parameters may be ordered based on a side link channel quality associated with one or more transmit beams, one or more receive beams, resources of one of the side link resource sets, or at least one of the side link resource sets. The side link channel quality may be determined based on various metrics such as spectral efficiency, throughput, spectral efficiency per energy unit, SINR, and the like.

[0098] The CSI reporting configuration may indicate one or more resources for sending the feedback report to the first wireless node. The one or more resources may be within one or more sidelink BWPs.

[0099] In certain aspects, one or more sidelink resource sets used for sidelink RS transmission may be within one or more sidelink BWPs. In other aspects, one or more sidelink resource sets and one or more resources indicated in a CSI reporting configuration may be within one or more sidelink BWPs.

[0100] The CSI reporting configuration may indicate the resource type of one or more side link resource sets. The CSI reporting configuration may also indicate whether at least one of the side link resource sets is periodic, semi-persistent, or aperiodic. In some aspects, the side link CSI feedback may be reported aperiodically. For example, the second wireless node may receive an aperiodic CSI trigger that triggers monitoring from a base station or a first wireless node. The aperiodic CSI trigger may include a downlink control information (DCI) message that includes a CSI request field. The measurement configuration may also indicate whether at least one of the side link resource sets is used for uplink beam management, codebook-based transmission, or non-codebook-based transmission.

[0101] Each of the one or more side link resource sets may include one or more side link resources, and each resource may include one or more symbols. In some cases, different receive beams may be used for different side link resources. That is, the second wireless node may receive different side link resources via different receive beams, for example, as described herein with respect to Figure 6 and 7 As described. For example, the measurement configuration may indicate the use of different receive beams to monitor the side link resources. For example, the measurement configuration may indicate that one or more side link reference signals are to be sent at multiple time domain resources using the same spatial transmit filter. The second wireless node may determine to use different receive beams at different time domain resources (e.g., time slots) based on RSs transmitted via the same spatial filter.

[0102] In certain aspects, the sidelink CSI feedback report may provide tracking information, for example, as described herein with respect to Figure 8 As described. As an example, at least one of the side link resource sets may include at least two side link resources that are in the same time slot and are discontinuous with respect to the time domain resources. Each of the at least two side link resources may include one or more consecutive OFDM symbols. The at least two side link resources may be in the same bandwidth and correspond to the same uplink antenna port.

[0103] The second wireless node may receive the measurement configuration and / or the CSI reporting configuration via RRC signaling (eg, RRC message) and / or MAC signaling (eg, MAC-CE).

[0104] The second wireless node may send the feedback report via various air interfaces. For example, the second wireless node may send the feedback report via at least one of the long format PSFCH, PSCCH, or PSSCH. The channel selected for transmitting the feedback report may depend on various factors, including the size of the feedback report and / or whether ACK / NACK feedback is enabled.

[0105] Fig.13 1 is a flow diagram illustrating example operations 1300 for wireless communication in accordance with certain aspects of the present disclosure. Operations 1300 may be performed, for example, by a BS (e.g., BS 110). Operations 1300 may supplement operations 1100 or 1200. Operations 1300 may be implemented as a process on one or more processors (e.g., Figure 2 In addition, in operation 1300, the BS may transmit and receive signals, for example, through one or more antennas (e.g., Figure 2In some aspects, the transmission and / or reception of signals by the BS may be implemented via a bus interface of one or more processors (eg, controller / processor 240) that obtain and / or output signals.

[0106] Operations 1300 may begin at 1302, where the BS may send a reference signal (RS) configuration indicating one or more sidelink resource sets to a first wireless node (e.g., UE 120a). At 1304, the BS may receive one or more feedback reports from the first wireless node, where each of the feedback reports includes an ordered sequence of at least one parameter associated with a sidelink channel quality of one or more sidelink reference signals sent by the first wireless node. At 1306, the BS may perform one or more actions based on the one or more feedback reports.

[0107] Operations 1300 may also include the BS sending a CSI reporting configuration to the first wireless node. The CSI reporting configuration may instruct the first wireless node to report feedback associated with the sidelink communication link, wherein the CSI reporting configuration is associated with one or more sidelink resource sets.

[0108] In certain aspects, the BS may receive one or more feedback reports based on the CSI reporting configuration. For example, the CSI reporting configuration may indicate one or more resources for forwarding feedback to the base station and / or receiving feedback from one or more second wireless nodes. That is, the CSI reporting configuration may provide a first set of resources for receiving feedback reports from the second wireless nodes and / or a second set of resources for reporting feedback reports to the BS. The one or more resources indicated in the CSI reporting configuration may be within one or more sidelink bandwidth parts (BWPs).

[0109] In certain aspects, one or more sidelink resource sets used for sidelink RS transmission may be within one or more sidelink BWPs. In other aspects, one or more sidelink resource sets and one or more resources indicated in a CSI reporting configuration may be within one or more sidelink BWPs.

[0110] In some cases, the sidelink RS configuration may configure RS resources that are consistent with RS resources associated with a BS-UE (Uu) air interface or BWP. If a UE is configured with multiple RS configurations, at least one of which is in a sidelink BWP and another in a Uu BWP, which results in the same RS transmission, the UE may be expected to transmit one RS for two purposes (sidelink and uplink measurements). For example, operation 1300 may include the BS determining that a first wireless node is configured with multiple RS configurations, including an RS configuration in a sidelink BWP and another RS ​​configuration in an uplink BWP. The BS may determine a resource set for RS transmission based on the multiple RS configurations, and receive one or more reference signals from the first wireless node via the determined resource set.

[0111] In certain aspects, one or more sidelink resource sets for sidelink RS transmission may be within a Uu BWP, such as a UL BWP, e.g., as described herein with respect to Fig.10 In some cases, the CSI reporting configuration may indicate resources for receiving feedback in the sidelink BWP, and the CSI reporting configuration may be associated with one or more sidelink resource sets within the Uu BWP. For example, operation 1300 may include the BS sending a CSI reporting configuration indicating reporting feedback associated with a sidelink communication link to the first wireless node, wherein the CSI reporting configuration is associated with one or more sidelink resource sets and indicates resources in the sidelink BWP.

[0112] The RS configuration and / or CSI report configuration may indicate the resource type of one or more side link resource sets. For example, the RS configuration and / or CSI report configuration may indicate whether at least one side link resource set in the side link resource set is periodic, semi-persistent or aperiodic. In some aspects, the side link CSI feedback may be reported aperiodically. For example, the BS may send an aperiodic CSI trigger to one or more second wireless nodes. The aperiodic CSI trigger may include a downlink control information (DCI) message that includes a CSI request field. The RS configuration may also indicate whether at least one side link resource set in the side link resource set is used for uplink beam management, codebook-based transmission or non-codebook-based transmission.

[0113] Each of the one or more side link resource sets may include one or more side link resources, and each resource may include one or more symbols. In some cases, different transmit beams may be used for different side link resources. That is, the first wireless node may transmit different side link resources via different transmit beams, for example, as described herein with respect to Figure 6For example, each side link resource of at least one side link resource set may correspond to a different transmission configuration indication (TCI) state or a different quasi-co-location (QCL) relationship associated with a spatial reception parameter, which may indicate that the first wireless node uses different transmit beams for different side link resources.

[0114] In certain aspects, the sidelink CSI feedback report may provide tracking information, for example, as described herein with respect to Figure 8 As described. As an example, at least one of the side link resource sets may include at least two side link resources that are in the same time slot and are discontinuous with respect to the time domain resources. Each of the at least two side link resources may include one or more consecutive OFDM symbols. The at least two side link resources may be in the same bandwidth and correspond to the same uplink antenna port.

[0115] In some cases, the first wireless node may forward the measurement configuration and / or CSI reporting configuration from the BS to one or more second wireless nodes. For example, when the one or more second wireless nodes are outside the cell coverage of the base station, the first wireless node may forward these configurations. Operation 1300 may include the BS sending a measurement configuration and / or CSI reporting configuration of one or more second wireless nodes to the first wireless node, the measurement configuration indicating which side link resource sets the one or more second wireless nodes are to monitor, wherein the CSI reporting configuration is associated with the one or more side link resource sets. The CSI reporting configuration of the second wireless node may indicate at least one parameter to be reported to the first wireless node. The BS may send the measurement configuration and / or CSI reporting configuration via RRC signaling (e.g., RRC message) and / or MAC signaling (e.g., MAC-CE).

[0116] In other cases, the BS may send the measurement configuration and / or the CSI reporting configuration directly to the one or more second wireless nodes. For example, when the second wireless node is within the cell coverage of the BS, the BS may send these configurations directly to the second wireless node. Operation 1300 may include the BS sending the measurement configuration and / or the CSI reporting configuration of the one or more second wireless nodes to the one or more second wireless nodes, the measurement configuration indicating which side link resource sets the one or more second wireless nodes are to monitor, wherein the CSI reporting configuration is associated with the one or more side link resource sets.

[0117] The BS may take various actions based on the side link channel quality reported in the feedback report. The sorted sequence of at least one parameter may be in various formats, for example, as described herein with respect to operation 1100. The sorted sequence of parameters may enable the BS to configure a transmit beam, receive beam, and / or side link resource set that provides a suitable channel quality (e.g., spectral efficiency associated with one or more transmit beams, one or more receive beams, or side link resource sets, throughput value, spectral efficiency per energy unit, or SINR) on the side link air interface between wireless nodes. That is, the BS may determine one or more transmit beams, one or more receive beams, and / or one or more side link resource sets for the first wireless node and / or the second wireless node based on the feedback report. The BS may send a configuration to the first wireless node and / or the second wireless node, indicating one or more transmit beams, one or more receive beams, and / or one or more side link resource sets for side link communication determined based on the feedback report.

[0118] Fig.14 A communication device 1400 (eg, UE 120a and / or UE 120b) is shown, which may include a device configured to perform operations for the techniques disclosed herein (eg, Fig.11 12). The communication device 1400 includes a processing system 1402 coupled to a transceiver 1408. The transceiver 1408 is configured to send and receive signals, such as the various signals described herein, for the communication device 1400 via an antenna 1410. The processing system 1402 may be configured to perform processing functions for the communication device 1400, including processing signals received and / or transmitted by the communication device 1400.

[0119] The processing system 1402 includes a processor 1404 coupled to a computer-readable medium / memory 1412 via a bus 1406. In some aspects, the computer-readable medium / memory 1412 is configured to store instructions (e.g., computer-executable code) that, when executed by the processor 1404, cause the processor 1404 to perform Fig.111404 includes circuits for receiving 1426, for sending 1428, for forwarding 1430, for monitoring 1432, and / or for generating 1434.

[0120] Fig.15 A communication device 1500 (eg, BS 110) is shown, which may include devices configured to perform operations (eg, Fig.13 1500 includes various components (e.g., corresponding to means plus function components) of the communication device 1500. The communication device 1500 includes a processing system 1502 coupled to a transceiver 1508. The transceiver 1508 is configured to send and receive signals, such as the various signals described herein, for the communication device 1500 via an antenna 1510. The processing system 1502 may be configured to perform processing functions of the communication device 1500, including processing signals received and / or transmitted by the communication device 1500.

[0121] The processing system 1502 includes a processor 1504 coupled to a computer-readable medium / memory 1512 via a bus 1506. In some aspects, the computer-readable medium / memory 1512 is configured to store instructions (e.g., computer-executable code) that, when executed by the processor 1504, cause the processor 1504 to perform Fig.13 1504. The processor 1504 may be configured to perform the operations shown in the computer-readable medium / memory 1512, or other operations for performing various techniques related to sidelink CSI discussed herein. In some aspects, the computer-readable medium / memory 1512 stores code 1514 for sending, code 1516 for receiving, and / or code 1518 for executing. In some aspects, the processor 1504 has circuits configured to implement the code stored in the computer-readable medium / memory 1512. The processor 1504 includes circuits 1520 for sending, circuits 1524 for receiving, and / or circuits 1526 for executing.

[0122] The techniques described herein can be used for various wireless communication technologies, such as NR (e.g., 5G NR), 3GPP Long Term Evolution (LTE), LTE-Advanced (LTE-A), 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), Time Division Synchronous Code Division Multiple Access (TD-SCDMA), and other networks. The terms "network" and "system" are often used interchangeably. A CDMA network can implement radio technologies such as Universal Terrestrial Radio Access (UTRA), cdma2000, etc. UTRA includes Wideband CDMA and other variants of CDMA. cdma2000 covers IS-2000, IS-95, and IS-856 standards. A TDMA network can implement radio technologies such as Global System for Mobile Communications (GSM). OFDMA networks can implement radio technologies such as NR (e.g., 5G RA), Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDMA, etc. UTRA and E-UTRA are part of Universal Mobile Telecommunications System (UMTS). LTE and LTE-A are versions of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, 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" (3GPP 2). NR is an emerging wireless communication technology under development.

[0123] The techniques described herein can be used for the above wireless networks and radio technologies as well as other wireless networks and radio technologies. For clarity, although various aspects may be described herein using terms commonly associated with 3G, 4G and / or 5G wireless technologies, various aspects of the present disclosure may be applied to other communication systems based on generations.

[0124] In 3GPP, the term "cell" can refer to the coverage area of ​​a Node B (NB) and / or a NB subsystem serving the coverage area, depending on the context in which the term is used. In NR systems, the terms "cell" and BS, next-generation Node B (gNB or gNodeB), access point (AP), distribution unit (DU), carrier, and transmit receive point (TRP) can be used interchangeably. The BS can provide communication coverage for macro cells, pico cells, femto cells, and / or other types of cells. A macro cell can cover a relatively large geographic area (e.g., a radius of several kilometers) and can allow unrestricted access to UEs with service subscriptions. A pico cell can cover a relatively small geographic area and can allow unrestricted access to UEs with service subscriptions. A femto cell can cover a relatively small geographic area (e.g., a home) and can allow UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs of users in a home, etc.) to have restricted access. The BS of a macro cell can be called a macro BS. The BS of a pico cell can be called a pico BS. The BS of a femto cell can be called a femto BS or a home BS.

[0125] UE may also be referred to as a mobile station, terminal, access terminal, subscriber unit, station, customer premises equipment (CPE), cellular phone, smart phone, personal digital assistant (PDA), wireless modem, wireless communication device, handheld device, laptop computer, cordless phone, wireless local loop (WLL) station, tablet computer, camera, gaming device, netbook, smartbook, ultrabook, appliance, medical device or medical equipment, biosensor / device, wearable device such as smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet, etc.), entertainment device (e.g., music device, video device, satellite radio, etc.), vehicle component or sensor, smart meter / sensor, industrial manufacturing equipment, global positioning system device, or any other suitable device configured to communicate via wireless or wired medium. Some UEs may be considered as machine type communication (MTC) devices or evolved MTC (eMTC) devices. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., which can communicate with a BS, another device (e.g., a remote device), or some other entity. A wireless node can provide connectivity to or to a network (e.g., a wide area network such as the Internet or a cellular network) via a wired or wireless communication link. Some UEs may be considered Internet of Things (IoT) devices, which may be narrowband IoT (NB-IoT) devices.

[0126] Some wireless networks (e.g., LTE) utilize orthogonal frequency division multiplexing (OFDM) on the downlink and single carrier frequency division multiplexing (SC-FDM) on the uplink. OFDM and SC-FDM divide the system bandwidth into multiple (K) orthogonal subcarriers, which are also commonly referred to as tones, bins, etc. Each subcarrier can be modulated with data. Typically, modulation symbols are sent in the frequency domain using OFDM, and modulation symbols are sent in the time domain using SC-FDM. The spacing between adjacent subcarriers can be fixed, and the total number of subcarriers (K) can depend on the system bandwidth. For example, the subcarrier spacing can be 15kHz, and the minimum resource allocation (called a "resource block" (RB)) can be 12 subcarriers (or 180kHz). Therefore, for system bandwidths of 1.25, 2.5, 5, 10, or 20 megahertz (MHz), the nominal fast Fourier transform (FFT) size can be equal to 128, 256, 512, 1024, or 2048, respectively. The system bandwidth may also be divided into subbands. For example, a subband may cover 1.08 MHz (i.e., 6 resource blocks), and for a system bandwidth of 1.25, 2.5, 5, 10, or 20 MHz, there may be 1, 2, 4, 8, or 16 subbands, respectively. In LTE, the basic transmission time interval (TTI) or packet duration is a 1 ms subframe.

[0127] NR can utilize OFDM with CP on both the uplink and downlink, and includes support for half-duplex operation using TDD. In NR, the subframe is still 1ms, but the basic TTI is called a time slot. Depending on the subcarrier spacing, the subframe contains a variable number of time slots (e.g., 1, 2, 4, 8, 16, ... time slots). NR RB is 12 consecutive frequency subcarriers. NR can support a basic subcarrier spacing of 15kHz, and other subcarrier spacings such as 30kHz, 60kHz, 120kHz, 240kHz, etc. can be defined relative to the basic subcarrier spacing. Symbol and time slot lengths scale with subcarrier spacing. The CP length also depends on the subcarrier spacing. Beamforming can be supported, and the beam direction can be dynamically configured. MIMO transmission with precoding can also be supported. In some examples, the MIMO configuration in DL can support up to 8 transmit antennas, with up to 8 streams per UE and up to 2 streams per UE. In some examples, multi-layer transmission with up to 2 streams per UE can be supported. Aggregation of multiple cells up to 8 serving cells can be supported.

[0128] In some examples, access to the air interface can be scheduled. A scheduling entity (e.g., BS) allocates resources for communications between some or all devices and equipment within its service area or cell. A scheduling entity may be responsible for scheduling, allocating, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communications, subordinate entities utilize resources allocated by the scheduling entity. The base station is not the only entity that can act as a scheduling entity. In some examples, a UE may act as a scheduling entity, and may schedule resources for one or more subordinate entities (e.g., one or more other UEs), and other UEs may use the resources scheduled by the UE for wireless communications. In some examples, a UE may act as a scheduling entity in a peer-to-peer (P2P) network and / or a mesh network. In a mesh network example, in addition to communicating with a scheduling entity, UEs may also communicate directly with each other.

[0129] The methods disclosed herein include one or more steps or actions for implementing these methods. Without departing from the scope of the claims, the method steps and / or actions can be interchangeable with each other. In other words, unless a specific order of steps or actions is specified, the order and / or use of specific steps and / or actions can be modified without departing from the scope of the claims.

[0130] As used herein, a phrase referring to "at least one of" a list of items refers to any combination of those items, including single members. For example, "at least one of a, b, or c" is intended to cover a, b, c, ab, ac, bc, and abc, as well as any combination of multiples of the same element (e.g., aa, aaa, aa, ab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other ordering of a, b, c.

[0131] As used herein, the term "determine" encompasses a wide variety of actions. For example, "determine" may include calculating, computing, processing, deriving, investigating, searching (e.g., searching in a table, a database, or another data structure), ascertaining, etc. In addition, "determine" may include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory), etc. In addition, "determine" may include resolving, selecting, choosing, establishing, etc.

[0132] The preceding description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects. Therefore, the claims are not intended to limit the aspects shown herein, but to conform to the full scope consistent with the language of the claims, wherein unless otherwise specified, the reference to the elements in the singular form is not intended to mean "one and only one", but "one or more". Unless otherwise specified, the term "some" refers to one or more. All structural and functional equivalents of the elements of the various aspects described throughout this disclosure known or to be known by a person of ordinary skill in the art are expressly incorporated herein by reference and are intended to be included by the claims. In addition, regardless of whether such disclosure is explicitly stated in the claims, the content disclosed herein is not intended to be dedicated to the public. Any claim element cannot be interpreted according to the provisions of 35 U.S.C. § 112 (f) unless the element is explicitly stated using the phrase "parts for...", or in the case of a method claim, the element is stated using the phrase "step for...".

[0133] The various operations of the above described method can be performed by any suitable component that can perform the corresponding function. The component may include various hardware and / or software components and / or modules, including but not limited to circuits, application specific integrated circuits (ASICs) or processors. Generally, in the case of operations shown in the figure, these operations can have corresponding components plus functional components with similar numbers.

[0134] The various illustrative logical blocks, modules, and circuits described in conjunction with the present disclosure may be implemented or executed with 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 (PLD), 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 alternatively, the processor may be any commercially available processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, a combination of one or more microprocessors with a DSP core, or any other such configuration.

[0135] If implemented in hardware, an example hardware configuration may include a processing system in a wireless node. The processing system may be implemented using a bus architecture. Depending on the specific application of the processing system and the overall design constraints, the bus may include any number of interconnecting buses and bridges. The bus may link various circuits together, including a processor, a machine-readable medium, and a bus interface. The bus interface may be used to connect a network adapter, etc., to the processing system via the bus. The network adapter may be used to implement the signal processing functions of the PHY layer. In the user equipment 120 (see Figure 1 ), a user interface (e.g., keyboard, display, mouse, joystick, etc.) may also be connected to the bus. The bus may also link various other circuits, such as timing sources, peripherals, voltage regulators, power management circuits, etc., which are well known in the art and are therefore not described further. The processor may be implemented with one or more general and / or special purpose processors. Examples include microprocessors, microcontrollers, DSP processors, and other circuits that can execute software. Those skilled in the art will recognize how to best implement the functionality of the described processing system depending on the specific application and the overall design constraints imposed on the entire system.

[0136] If implemented in software, these functions can be stored or transmitted as one or more instructions or codes on a computer-readable medium. Software should be broadly interpreted as instructions, data, or any combination thereof, whether it refers to software, firmware, middleware, microcode, hardware description language, or other. Computer-readable media include both computer storage media and communication media, and communication media include any media that facilitates the transfer of computer programs from one place to another. The processor can be responsible for managing the bus and general processing, including the execution of software modules stored on the machine-readable storage medium. The computer-readable storage medium can be coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. Alternatively, the storage medium can be integrated into the processor. For example, the machine-readable medium may include a transmission line, a carrier modulated with data, and / or a computer-readable storage medium on which instructions separated from the wireless node are stored, all of which can be accessed by the processor through a bus interface. Alternatively or additionally, the machine-readable medium or any part thereof can be integrated into the processor, such as the case of a cache and / or a general register stack. For example, examples of machine-readable storage media may include random access memory (RAM), flash memory, read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), registers, magnetic disks, optical disks, hard disks, or any other suitable storage media or any combination thereof. Machine-readable media may be embodied in a computer program product.

[0137] A software module may include a single instruction or multiple instructions, and may be distributed on several different code segments, between different programs, and across multiple storage media. A computer-readable medium may include several software modules. A software module includes instructions that, when executed by a device such as a processor, cause a processing system to perform various functions. A software module may include a sending module and a receiving module. Each software module may reside in a single storage device, or may be distributed across multiple storage devices. For example, when a triggering event occurs, a software module may be loaded from a hard drive into a RAM. During the execution of a software module, a processor may load some of the instructions into a cache to increase access speed. Then, one or more cache lines may be loaded into a general register stack to be executed by a processor. When referring to the functions of the following software modules, it will be understood that such functions are implemented by a processor when instructions from the software module are run.

[0138] 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 technology (such as infrared (IR), radio and microwave) is used to transmit software from a website, server or other remote source, the coaxial cable, fiber optic cable, twisted pair, DSL or wireless technology (such as IR, radio and microwave) are all included in the definition of medium. As used herein, disks and discs include compact discs (CDs), laser discs, optical discs, digital versatile discs (DVDs), floppy disks and blue-ray discs, wherein disks usually copy data magnetically, while optical discs use lasers to optically copy data. Therefore, in some aspects, computer-readable media may include non-temporary computer-readable media (e.g., tangible media). In addition, for other aspects, computer-readable media may include temporary computer-readable media (e.g., signals). The combination of the above should also be included in the scope of computer-readable media.

[0139] Thus, certain aspects may include a computer program product for performing the operations presented herein. For example, such a computer program product may include a computer-readable medium having stored thereon (and / or encoded thereon) instructions that may be executed by one or more processors to perform the operations described herein, for example, for performing the operations described herein and in Fig.11 , Fig.12 and / or Fig.13 The operations are shown in the instructions.

[0140] In addition, it should be understood that the modules and / or other suitable components for executing the methods and techniques described herein can be downloaded and / or otherwise obtained by applicable user terminals and / or base stations. For example, such a device can be coupled to a server to facilitate the transfer of components for executing the methods described herein. Alternatively, the various methods described herein can be provided via a storage component (e.g., RAM, ROM, a physical storage medium such as a compact disc (CD) or a floppy disk, etc.), so that the user terminal and / or base station can obtain various methods when the storage device is coupled to the device or provided to the device. In addition, any other suitable technology for providing the methods and techniques described herein to the device can be utilized.

[0141] It is to be understood that the claims are not limited to the precise configuration and components described above. Various modifications, changes and variations may be made in the arrangement, operation and details of the methods and apparatus described above without departing from the scope of the claims.

Claims

1. A method for wireless communication by a first wireless node, comprising: sending a channel state information (CSI) reporting configuration and a measurement configuration to one or more second wireless nodes, the CSI reporting configuration indicating reporting feedback associated with one or more sidelink communication links, wherein the CSI reporting configuration is associated with one or more sidelink resource sets, the measurement configuration indicating that the one or more second wireless nodes are to monitor the one or more sidelink resource sets, wherein the measurement configuration indicates whether the CSI reporting configuration is enabled or disabled; sending one or more sidelink reference signals to the one or more second wireless nodes; and One or more feedback reports are received from the one or more second wireless nodes, wherein each of the one or more feedback reports comprises an ordered sequence of at least one parameter associated with a sidelink channel quality of the one or more sidelink reference signals.

2. The method according to claim 1, wherein each of the one or more side link resource sets comprises one or more side link resources, wherein each of the one or more side link resources comprises one or more symbols, and wherein each of the one or more side link resources corresponds to a different transmission configuration indication TCI state or a different quasi-co-location QCL relationship associated with a spatial reception parameter.

3. The method according to claim 1, wherein the sidelink reference signal of the one or more sidelink reference signals comprises at least one of a sounding reference signal or a CSI reference signal (CSI-RS).

4. The method according to claim 1, further comprising: A sidelink communication is sent to the one or more second wireless nodes based on the one or more feedback reports.

5. The method according to claim 1, further comprising: The one or more feedback reports are forwarded to a network node based on the CSI reporting configuration, wherein the CSI reporting configuration indicates one or more sidelink resources for receiving feedback from the one or more second wireless nodes.

6. A method according to claim 1, wherein the sorted sequence of the at least one parameter includes multiple parameter values, each parameter value is associated with at least one side link resource set of the one or more side link resource sets or one or more side link resources of one of the one or more side link resource sets.

7. The method of claim 1, wherein the sorting sequence of the at least one parameter is sorted based on at least one of the one or more side link resource sets or one or more side link resources of one of the one or more side link resource sets.

8. The method of claim 7, wherein the sorting sequence of the at least one parameter is sorted based on at least one of a spectral efficiency, a throughput value, a spectral efficiency per energy unit, a channel quality indicator (CQI), or a signal-to-noise-and-interference ratio (SINR) associated with at least one of the one or more side link resource sets or the one or more side link resources of one of the one or more side link resource sets.

9. A method according to claim 1, wherein the sorted sequence of the at least one parameter includes a plurality of tuples sorted based on the side link channel quality associated with at least one side link resource set of the one or more side link resource sets or one or more side link resources of one of the one or more side link resource sets.

10. The method according to claim 1, wherein the at least one parameter includes at least one of a reference signal received power RSRP, a received signal strength indicator RSSI, a signal to noise and interference ratio SINR, a transmit precoder matrix indicator TPMI, a rank indicator RI, a CSI reference signal resource indicator CRI, a sounding reference signal indicator SRI, a channel quality indicator CQI or a side link resource set indicator.

11. The method of claim 1, wherein the one or more sidelink resource sets are within one or more sidelink bandwidth parts (BWPs).

12. The method according to claim 11, further comprising: receiving, from a network node, a reference signal (RS) configuration indicating the one or more sidelink resource sets; determining that the first wireless node is configured with a plurality of RS configurations, including an RS configuration in a sidelink BWP and another RS ​​configuration in an uplink BWP; determining a set of sidelink resources for RS transmission based on the multiple RS configurations; as well as A reference signal is sent to the network node and the one or more second wireless nodes via the set of sidelink resources.

13. The method of claim 1, wherein the one or more sidelink resource sets are within an uplink bandwidth portion.

14. The method according to claim 13, further comprising: The CSI reporting configuration associated with the one or more sidelink resource sets within the uplink bandwidth portion is received from a network node.

15. A method according to claim 1, wherein at least one of the one or more side link resource sets includes at least two side link resources that are in the same time slot and are not continuous with each other with respect to time domain resources, wherein each of the at least two side link resources includes one or more continuous orthogonal frequency division multiplexing (OFDM) symbols.

16. The method of claim 15, wherein the at least two side link resources are in the same bandwidth and correspond to the same uplink antenna port.

17. The method of claim 1, wherein receiving the one or more feedback reports comprises receiving the one or more feedback reports via at least one of a long format physical sidelink feedback channel (PSFCH), a physical sidelink control channel (PSCCH), or a physical sidelink shared channel (PSSCH).

18. A method for wireless communication by a second wireless node, comprising: receiving a measurement configuration and a channel state information (CSI) reporting configuration from a first wireless node, the measurement configuration indicating one or more sidelink resource sets to be monitored, the CSI reporting configuration being associated with the one or more sidelink resource sets, wherein the measurement configuration indicates whether the CSI reporting configuration is enabled or disabled; monitoring sidelink transmissions from the first wireless node via the one or more sets of sidelink resources based at least in part on the measurement configuration; generating a feedback report based on the CSI reporting configuration, the feedback report comprising an ordered sequence of at least one parameter associated with a sidelink channel quality of the sidelink transmission; as well as The feedback report is sent to the first wireless node.

19. A method according to claim 18, wherein each of the one or more side link resource sets includes one or more side link resources, wherein each side link resource includes one or more symbols, and wherein each side link resource corresponds to a different transmission configuration indication TCI state or quasi-co-location QCL relationship associated with a spatial reception parameter.

20. The method of claim 18, wherein the sorted sequence of the at least one parameter comprises a plurality of parameter values, each parameter value being associated with at least one of the one or more side link resource sets or one or more side link resources of one of the one or more side link resource sets.

21. The method of claim 18, wherein the sorting sequence of the at least one parameter is sorted based on the side link channel quality associated with at least one of the one or more side link resource sets or one or more side link resources of one of the one or more side link resource sets.

22. A method according to claim 21, wherein the sorting sequence of the at least one parameter is sorted based on at least one of the spectral efficiency, throughput value, spectral efficiency per energy unit, channel quality indicator CQI or signal to noise and interference ratio SINR associated with at least one of the one or more side link resource sets or the one or more side link resources of one of the one or more side link resource sets.

23. A method according to claim 18, wherein the sorted sequence of the at least one parameter includes a plurality of tuples sorted based on the side link channel quality associated with at least one side link resource set of the one or more side link resource sets or one or more side link resources of one of the one or more side link resource sets.

24. The method according to claim 18, wherein the at least one parameter includes at least one of a reference signal received power RSRP, a received signal strength indicator RSSI, a signal to noise and interference ratio SINR, a transmit precoder matrix indicator TPMI, a rank indicator RI, a CSI reference signal resource indicator CRI, a sounding reference signal indicator SRI, a channel quality indicator CQI or a side link resource set indicator.

25. The method of claim 18, wherein the CSI reporting configuration indicates one or more sidelink resources for sending the feedback report to the first wireless node, and wherein the one or more sidelink resources are within one or more bandwidth parts (BWPs).

26. An apparatus for wireless communication, comprising: The receiver is configured as: receiving one or more feedback reports from one or more second wireless nodes, wherein each of the one or more feedback reports comprises an ordered sequence of at least one parameter associated with a sidelink channel quality of one or more sidelink reference signals; and The transmitter is configured as: sending a CSI reporting configuration and a measurement configuration to the one or more second wireless nodes, the CSI reporting configuration indicating reporting feedback associated with one or more sidelink communication links, wherein the CSI reporting configuration is associated with one or more sidelink resource sets, the measurement configuration indicating that the one or more second wireless nodes are to monitor the one or more sidelink resource sets, wherein the measurement configuration indicates whether the CSI reporting configuration is enabled or disabled; and The one or more sidelink reference signals are sent to the one or more second wireless nodes.

27. The apparatus of claim 26, wherein the sorted sequence of the at least one parameter is sorted based on at least one of the one or more sidelink resource sets or one or more sidelink resources of one of the one or more sidelink resource sets.

28. The apparatus of claim 26, wherein the sorted sequence of the at least one parameter is sorted based on at least one of a spectral efficiency, a throughput value, a spectral efficiency per energy unit, a channel quality indicator (CQI), or a signal-to-noise-and-interference ratio (SINR) associated with at least one of the one or more sidelink resource sets or one or more sidelink resources of one of the one or more sidelink resource sets, and The at least one parameter includes at least one of a reference signal received power RSRP, a received signal strength indicator RSSI, a signal to noise and interference ratio SINR, a transmit precoder matrix indicator TPMI, a rank indicator RI, a CSI reference signal resource indicator CRI, a sounding reference signal indicator SRI, a channel quality indicator CQI or a side link resource set indicator.

29. An apparatus for wireless communication, comprising: The receiver is configured as: receiving a measurement configuration and a CSI reporting configuration from a first wireless node, the measurement configuration indicating one or more sidelink resource sets to be monitored, the CSI reporting configuration being associated with the one or more sidelink resource sets, wherein the measurement configuration indicates whether the CSI reporting configuration is enabled or disabled, and monitoring sidelink transmissions from the first wireless node via the one or more sets of sidelink resources based at least in part on the measurement configuration; a processing system and memory configured to generate a feedback report based on the CSI reporting configuration, the feedback report comprising an ordered sequence of at least one parameter associated with a sidelink channel quality of the sidelink transmission; and A transmitter is configured to send the feedback report to the first wireless node.

30. An apparatus according to claim 29, wherein the sorted sequence of the at least one parameter comprises a plurality of parameter values, each parameter value being associated with at least one side link resource set of the one or more side link resource sets or one or more side link resources of one of the one or more side link resource sets.

31. An apparatus for wireless communication by a first wireless node, comprising: Components for performing the steps of the method according to any one of claims 1-17.

32. An apparatus for wireless communication by a second wireless node, comprising: Means for performing the steps of the method according to any one of claims 18-25.

33. A non-transitory computer readable medium storing program code, wherein: When executed by a processor, the program code performs a method for wireless communication by a first wireless node according to any one of claims 1-17.

34. A non-transitory computer readable medium storing program code, wherein: When executed by a processor, the program code performs a method for wireless communication by a second wireless node according to any one of claims 18-25.

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