Channel state information reporting

Abstract

Various aspects of the present disclosure relate to CSI reporting. In some embodiments, a first user equipment (UE) transmits, to a second UE, a plurality of sidelink reference signals on a first resource for determining CSI between the first UE and the second UE. The first UE then determines, based on the first resource, a second resource for receiving a report of the CSI. Further, the first UE receives the report from the second UE on the second resource. In this way, sidelink communications can be improved with increased efficiency.

Description

Technical Field

[0001] This disclosure relates to wireless communications, and more specifically to Channel State Information (CSI) reporting. Background Technology

[0002] A wireless communication system may include one or more network communication devices (such as base stations), which may also be referred to as eNodeB (eNB), next-generation NodeB (gNB), or other suitable terms. Each network communication device (such as a base station) may support wireless communication with one or more user communication devices, which may also be referred to as user equipment (UE), or other suitable terms. The wireless communication system may support wireless communication with one or more user communication devices by utilizing the resources of the wireless communication system (e.g., time resources (e.g., symbols, time slots, subframes, frames, etc.) or frequency resources (e.g., subcarriers, carriers)). Furthermore, the wireless communication system may support wireless communication across a variety of radio access technologies, including third-generation (3G) radio access technology, fourth-generation (4G) radio access technology, fifth-generation (5G) radio access technology, and other suitable radio access technologies beyond 5G (e.g., sixth-generation (6G)).

[0003] Sidelink reference signals have been introduced to facilitate sidelink communication. For example, a sidelink channel state information reference signal (SL CSI-RS) transmitted by the transmitting (TX) UE is used to measure channel state information (CSI) at the receiving (RX) UE. The RX UE then reports the CSI to the TX UE. The TX UE can then adjust its transmission based on the reported CSI. However, enhancements to CSI reporting are still needed. Summary of the Invention

[0004] This disclosure relates to methods, apparatus, and systems for supporting CSI reporting. These apparatuses and methods can improve sidelink communication with increased efficiency.

[0005] In a first aspect, a first UE is provided. The first UE includes at least one memory; and at least one processor coupled to the at least one memory and configured such that the first UE: transmits a plurality of sidelink reference signals on a first resource to a second UE for determining channel state information (CSI) between the first UE and the second UE; determines a second resource based on the first resource for receiving a report of CSI; and receives a report from the second UE on the second resource.

[0006] In a second aspect, a method performed by a first UE is provided. The method includes: transmitting a plurality of sidelink reference signals on a first resource to a second UE for determining channel state information (CSI) between the first UE and the second UE; determining a second resource based on the first resource for receiving a report of the CSI; and receiving the report from the second UE on the second resource.

[0007] In a third aspect, a processor for wireless communication is provided. The at least one processor includes at least one controller coupled to at least one memory and configured such that the at least one processor: transmits, on a first resource, a plurality of sidelink reference signals to a second UE for determining channel state information (CSI) between the first UE and the second UE; determines, based on the first resource, a second resource for receiving a report of the CSI; and receives the report from the second UE on the second resource.

[0008] The methods described herein and some implementations of the first UE may further include determining a first resource based on configuration information, including periods for transmitting multiple sidelink reference signals. In the methods described herein and some implementations of the first UE, the configuration information is pre-configured or configured by the base station (BS). In the methods described herein and some implementations of the first UE, the configuration information is pre-configured or configured per resource pool (RP) or per bandwidth portion (BWP). In the methods described herein and some implementations of the first UE, the configuration information is configured via Radio Resource Control (RRC) signaling.

[0009] In the method described herein and some implementations of the first UE, determining the first resource includes: determining multiple time slots for transmitting multiple sidelink reference signals based on the period and one or more time offsets, wherein the time offset in the one or more time offsets represents the time domain offset of the time slot for transmitting one of the multiple sidelink reference signals relative to the start boundary of the time period.

[0010] In the methods described herein and in some implementations of the first UE, one or more time offsets are either determined by the first UE or configured by the BS.

[0011] The methods described in this paper and some implementations of the first UE may also include sending one or more time offsets to the second UE.

[0012] In the methods described herein and in some implementations of the first UE, one or more time offsets are transmitted in one of the following: side link control information (SCI) or media access control element (MAC CE) in one of the following: each of multiple time slots; one or more of multiple time slots; the first time slot of multiple time slots; or the last time slot of multiple time slots.

[0013] In the methods described herein and some implementations of the first UE, determining the second resource includes: determining that the temporal resource distribution of the second resource is the same as the temporal resource distribution of the first resource, the frequency domain resource configuration of the second resource is the same as the frequency domain resource configuration of the first resource, and that a time interval exists between the first resource and the second resource; obtaining the time interval; and determining the temporal resources in the second resource based on the time interval, the period, and one or more time offsets. In the methods described herein and some implementations of the first UE, the time interval is: determined by the first UE; or pre-configured or configured by the BS. In the methods described herein and some implementations of the first UE, the time interval is determined by the first UE, and the methods described herein and some implementations of the first UE may further include sending an indicator of the time interval and the last time slot in the first resource to the second UE. In the methods described herein and some implementations of the first UE, the time interval is determined by the first UE, and the methods described herein and some implementations of the first UE may further include sending to the second UE an indication of the interval of the first time slot in the second resource relative to a reference time slot in the first resource; and for determining the reference time slot one of the following: an index of the reference time slot; the number of remaining time slots after the reference signal in the first resource; an indicator of the first time slot in the first resource; or an indicator of the last time slot in the first resource.

[0014] In the methods described herein and some implementations of the first UE, the resources available for CSI reporting are divided into multiple parts in the time domain. Each of these parts is associated with one or more transmissions of one or more sidelink reference signals among a plurality of sidelink reference signals, and has each of a plurality of time offsets, where the one or more time offsets are one or more of the plurality of time offsets. Determining the second resource includes: determining the time-domain resources of the second resource based on the one or more time offsets. In the methods described herein and some implementations of the first UE, the association between one of the multiple parts of the resources available for CSI reporting and the corresponding time offset in the one or more time offsets is one of the following: determined by the first UE and sent to the second UE; or pre-configured or configured by the BS. In the methods described herein and some implementations of the first UE, the frequency-domain resource configuration of the second resource is the same as that of the first resource. In the methods described herein and some implementations of the first UE, determining the second resource further includes: determining the frequency-domain resources of the second resource based on one of the following: the association between the frequency-domain start position of the first resource and the frequency-domain start position of the second resource; the frequency offset between the frequency-domain start position of the first resource and the frequency-domain start position of the second resource; or the frequency-domain size of the second resource. In the methods described herein and some implementations of the first UE, one of the following—the association between the frequency domain start position of the first resource and the frequency domain start position of the second resource, the frequency offset, or the frequency domain size—is determined by the first UE and sent to the second UE; or pre-configured or configured by the BS.

[0015] In a fourth aspect, a second UE is provided. The second UE includes at least one memory; and at least one processor coupled to the at least one memory and configured such that the second UE: receives from a first UE on a first resource a plurality of sidelink reference signals for determining channel state information (CSI) between the first UE and the second UE; determines, based on the first resource, a second resource associated with a report for transmitting the CSI; and transmits the report to the first UE based on the second resource.

[0016] In a fifth aspect, a method performed by a second UE is provided. The method includes: receiving, on a first resource, a plurality of sidelink reference signals for determining channel state information (CSI) between the first UE and the second UE; determining, based on the first resource, a second resource associated with a report for transmitting the CSI; and transmitting the report to the first UE based on the second resource.

[0017] In a sixth aspect, a processor for wireless communication is provided. The at least one processor includes at least one controller coupled to at least one memory and configured such that the at least one processor: receives, on a first resource, a plurality of sidelink reference signals from a first UE for determining channel state information (CSI) between the first UE and a second UE; determines, based on the first resource, a second resource associated with a report for transmitting the CSI; and transmits the report to the first UE based on the second resource.

[0018] The method described herein and some implementations of the second UE may further include: determining a beam pair of the first UE's transmit beam and the second UE's receive beam based on multiple measurements of multiple side-link reference signals; and determining a third resource for sending a report from a second resource based on the beam pair, and sending a report based on the second resource includes: sending a report to the first UE on the third resource.

[0019] The methods described herein and some implementations of the second UE may further include: determining a first resource based on configuration information, which includes periods for transmitting multiple sidelink reference signals. In some implementations of the methods described herein and the second UE, the configuration information is pre-configured or configured by the base station (BS). In some implementations of the methods described herein and the second UE, the configuration information is pre-configured or configured per resource pool (RP) or per bandwidth portion (BWP). In some implementations of the methods described herein and the second UE, the configuration information is configured via Radio Resource Control (RRC) signaling.

[0020] In some implementations of the method and the second UE described herein, determining the first resource includes: determining multiple time slots for transmitting multiple sidelink reference signals based on the period and one or more time offsets, where the time offset in the one or more time offsets represents the time-domain offset of a time slot used to transmit one of the multiple sidelink reference signals relative to the start boundary of the time period. Some implementations of the method and the second UE described herein may also include receiving one or more time offsets from the first UE. In some implementations of the method and the second UE described herein, the one or more time offsets are transmitted in one of the following: sidelink control information (SCI) or media access control element (MAC CE) in one of the following: each of the multiple time slots; one or more of the multiple time slots; the first time slot of the multiple time slots; or the last time slot of the multiple time slots.

[0021] In some implementations of the method and the second UE described herein, determining the second resource includes: determining that the temporal resource distribution of the second resource is the same as the temporal resource distribution of the first resource, the frequency domain resource configuration of the second resource is the same as the frequency domain resource configuration of the first resource, and that a time interval exists between the first resource and the second resource; determining the time interval; and determining the temporal resources in the second resource based on the time interval, the period, and one or more time offsets. In some implementations of the method and the second UE described herein, the time interval is: received from the first UE; or pre-configured or configured by the BS. In some implementations of the method and the second UE described herein, receiving the time interval includes: receiving the time interval and an indicator of the last time slot in the first resource from the first UE. In some implementations of the method and the second UE described herein, receiving the time interval includes: receiving from the first UE: an indication of the interval of the first time slot in the second resource relative to a reference time slot in the first resource; and one of the following for determining the reference time slot: an index of the reference time slot; the number of remaining time slots after the reference signal in the first resource; an indicator of the first time slot in the first resource; or an indicator of the last time slot in the first resource.

[0022] In some implementations of the method and the second UE described herein, the resources available for CSI reporting are divided into multiple parts in the time domain. Each of these parts is associated with one or more transmissions of one or more sidelink reference signals among a plurality of sidelink reference signals, and has each of a plurality of time offsets, wherein the one or more time offsets are one or more of the plurality of time offsets. Determining the second resource includes: determining the time-domain resources of the second resource based on the one or more time offsets. In some implementations of the method and the second UE described herein, the association between one of the multiple parts of the resources available for CSI reporting and the corresponding time offset among the one or more time offsets is one of the following: received from the first UE; or pre-configured or configured by the BS. In some implementations of the method and the second UE described herein, the frequency-domain resource configuration of the second resource is the same as the frequency-domain resource configuration of the first resource. In some implementations of the method and the second UE described herein, determining the second resource further includes: determining the frequency-domain resources of the second resource based on one of the following: the association between the frequency-domain start position of the first resource and the frequency-domain start position of the second resource; the frequency offset between the frequency-domain start position of the first resource and the frequency-domain start position of the second resource; or the frequency-domain size of the second resource. In some implementations of the method described herein and the second UE, one of the following—the association between the frequency domain start position of the first resource and the frequency domain start position of the second resource, the frequency offset, or the frequency domain size—is received from the first UE; or pre-configured or configured by the BS.

[0023] In a seventh aspect, a base station is provided, the base station including at least one memory; and at least one processor coupled to the at least one memory and configured to cause the BS to send configuration information to a user equipment (UE), the configuration information including a period for transmitting a plurality of sidelink reference signals.

[0024] In an eighth aspect, a method performed by a base station is provided. The method includes: sending configuration information to a user equipment (UE), the configuration information including periods for transmitting multiple sidelink reference signals.

[0025] In a ninth aspect, a processor for wireless communication is provided. The at least one processor includes at least one controller coupled to at least one memory and configured to cause the at least one processor to: transmit configuration information to a user equipment (UE), the configuration information including periods for transmitting a plurality of sidelink reference signals.

[0026] In the methods described in this paper and in some implementations of BS, the configuration information is pre-configured or configured per resource pool (RP) or per bandwidth portion (BWP).

[0027] In the methods described in this paper and in some implementations of the BS, configuration information is configured via Radio Resource Control (RRC) signaling.

[0028] In the methods described herein and some implementations of the BS, the configuration information also includes one of the following: a minimum time interval between a first resource for transmitting multiple sidelink reference signals and a second resource for transmitting reports associated with multiple measurements of the multiple sidelink reference signals; an association between multiple portions of a resource available for CSI reporting and multiple time offsets, wherein each of the multiple portions is associated with one or more transmissions of one or more sidelink reference signals among the multiple sidelink reference signals, and has each of the multiple time offsets representing a time-domain offset of a time slot used to transmit one of the multiple sidelink reference signals relative to the start boundary of that time period; an association between the frequency-domain start position of the first resource and the frequency-domain start position of the second resource; a frequency offset between the frequency-domain start position of the first resource and the frequency-domain start position of the second resource; the frequency-domain size of the first resource; or the frequency-domain size of the second resource.

[0029] It should be understood that the summary section is not intended to identify key or essential features of the embodiments of this disclosure, nor is it intended to limit the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0030] Figure 1Examples of wireless communication systems supporting CSI reports according to various aspects of this disclosure are illustrated;

[0031] Figure 2A and Figure 2B The illustration shows an example process flow according to some example embodiments of the present disclosure;

[0032] Figure 3A The illustration shows an example resource configuration for CSI-RS transmission according to some example embodiments of the present disclosure;

[0033] Figure 3B The illustration shows a first example resource configuration for CSI-RS transmission and CSI reporting according to some example embodiments of the present disclosure;

[0034] Figure 3C The illustration shows a second example resource configuration for CSI-RS transmission and CSI reporting according to some example embodiments of the present disclosure;

[0035] Figure 3D The illustration shows a third example resource configuration for CSI-RS transmission and CSI reporting according to some example embodiments of this disclosure;

[0036] Figure 3E The illustration shows a fourth example resource configuration for CSI-RS transmission and CSI reporting according to some example embodiments of this disclosure;

[0037] Figure 4 Examples of devices supporting CSI reporting according to various aspects of this disclosure are illustrated;

[0038] Figure 5 The illustration shows an example of a processor supporting CSI reporting according to various aspects of this disclosure; and

[0039] Figures 6 to 8 The diagram illustrates a flowchart of a method for supporting CSI reports according to various aspects of this disclosure.

[0040] Throughout the accompanying drawings, the same or similar reference numerals denote the same or similar elements. Detailed Implementation

[0041] The principles of this disclosure will now be described with reference to some embodiments. It should be understood that these embodiments are described for illustrative purposes only and to assist those skilled in the art in understanding and implementing this disclosure, and do not impose any limitation on the scope of this disclosure. The disclosure described herein can be implemented in various ways other than those described below.

[0042] In the following description and claims, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains.

[0043] References to "an embodiment," "an exemplary embodiment," and "an embodiment," etc., in this disclosure indicate that the described embodiments may include a particular feature, structure, or characteristic, but not every embodiment is required to include that particular feature, structure, or characteristic. Furthermore, these phrases do not necessarily refer to the same embodiment(s). Moreover, when a particular feature, structure, or characteristic is described in connection with an embodiment, those skilled in the art will recognize that in conjunction with other embodiments (whether explicitly described or not) affecting such a feature, structure, or characteristic is within the scope of their knowledge.

[0044] It should be understood that although the terms “first” and “second” may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, a first element may also be referred to as a second element without departing from the scope of the embodiments, and similarly, a second element may also be referred to as a first element. As used herein, the term “and / or” includes any and all combinations of one or more of the listed terms. In some examples, values, processes, or apparatus are referred to as “best,” “lowest,” “highest,” “minimum,” “maximum,” etc. It should be understood that such descriptions are intended to indicate that a choice can be made among many functional alternatives used, and that such a choice need not be better, smaller, higher, or more desirable than other choices.

[0045] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the embodiments. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “the” used herein also include the plural forms. Furthermore, it should be understood that the terms “comprises,” “comprising,” “has,” “having,” “includes,” and / or “including”, when used herein, specify the presence of the stated features, elements, components, etc., but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. For example, the term “comprising” and its variations should be understood as open terms meaning “including, but not limited to.” The term “based on” should be understood as “at least partially based on.” The terms “one embodiment” and “embodiment” should be understood as “at least one embodiment.” The term “another embodiment” should be understood as “at least one other embodiment.” The use of expressions such as “A and / or B” can mean “A only” or “B only” or “both A and B.” Other explicit and implicit definitions may be included below.

[0046] As described above, the side-link (SL) CSI-RS is used to measure the CSI at the RX UE, which is then fed back to the TX UE. The TX UE can adjust its transmission based on the fed-back CSI. The SL CSI-RS is transmitted within the Physical Side-Link Shared Channel (PSSCH) area of ​​the time slot.

[0047] In New Radio (NR) Vehicle-to-Everything (V2X) communication, SL CSI-RS transmission only supports unicast transmission. NR V2X also supports CSI reporting in unicast communication. The RX UE can measure CSI and report it back to the TX UE via a CSI report carried within the PSSCH. To request CSI feedback from the RX UE, a 1-bit CSI request is sent in SCI format 2-A within the Level 2 SCI.

[0048] The transmission of SL CSI-RS by the TX UE and the CSI request sent in the second-phase SCI trigger the RX UE to feed back CSI reports on the unicast link. The TX UE can be configured to send aperiodic CSI reports from the RX UE. The RX UE can measure CSI based on the SL CSI-RS sent by the TX UE. The RX UE feeds back CSI (e.g., Channel Quality Indicator (CQI) or Rank Indicator (RI)) to the TX UE via CSI reports through the PSSCH. The CSI reports are carried in the Media Access Control (MAC) control element (CE) on the PSSCH sent from the RX UE to the TX UE.

[0049] To avoid outdated CSI reports, the RX UE should submit a CSI report within a maximum time frame. This maximum time frame is called the delay limit. The delay limit is determined by the TX UE and is signaled to the RX UE via ProSe Communications 5 (PC5) Radio Resource Control (PC5-RRC) signaling.

[0050] The SL CSI-RS design is based on the Rel-15 NR Uu CSI-RS design. Furthermore, the resource mapping of SL CSI-RS in the PRB is based on the CSI-RS resource mapping pattern in NR Uu, which supports up to two antenna ports (as in NR V2X SL, where up to two streams can be supported in the PSSCH). Each Physical Resource Block (PRB) within the PSSCH uses the same pattern for SL CSI-RS. SL CSI-RS is not transmitted on symbols containing the Physical Side Link Control Channel (PSCCH), Level 2 SCI, or PSSCH DMRS.

[0051] The SL CSI-RS configuration includes the resource mapping mode and the number of antenna ports for the SL CSI-RS. The SL CSI-RS configuration is selected by the TX UE and provided to the RX UE via the Proximity Services (ProSe) Communication 5 (PC5)-RRC configuration.

[0052] Furthermore, in Release 18 (Rel-18), a new Study Project Description (SID) was approved regarding sidelink evolution, which includes objectives for enhanced operation of the Frequency Range 2 (FR2) licensed spectrum. In FR2, more consideration needs to be given to supporting beam management on sidelinks (e.g., Initial Beam Pairing (IBP)).

[0053] Before or during unicast sidelink communication established between a TX UE and an RX UE, neither the TX UE nor the RX UE has information to determine which TX / RX beam(s) to use between them. In this case, the UE needs prior knowledge related to beam scanning to perform initial beam pairing. This knowledge includes the TX beam scanning mode of the TX UE for monitoring reference signals(s) (e.g., resources for transmitting reference signals and TX beams for transmission) and the RX beam scanning mode of the RX UE for indicating the selected beam or beam pair. That is, the TX UE and RX UE need to perform initial beam pairing based on (pre)configured (multiple) beam scanning modes before / during unicast sidelink communication establishment. In NR V2X as specified in 3GPP Rel-16 / Release 17 (Rel-17), SL CSI-RS transmissions supporting unicast transmissions are used for beam management.

[0054] The inventors have noted that, from a signaling overhead perspective, beam scanning mode configurations supporting periodic reference signal transmission are efficient in this scenario. To support a periodic SL CSI-RS framework, independent CSI-RS transmissions are required. Independent SL CSI-RS transmissions mean that at least no accompanying sidelink data (SL MAC Service Data Unit (SDU)) transmissions occur in the same time slot.

[0055] In resource allocation mode 2, a dedicated resource pool is required to support periodic SL CSI-RS transmissions. This is because, since sidelink resources are determined based on sensing, each CSI-RS transmission may experience intolerable delays due to resource selection if the network is under heavy traffic.

[0056] In resource allocation mode 1, a resource pool can be shared between periodic SL CSI-RS transmissions and PSSCH / Physical Side Link Control Channel (PSCCH) transmissions. Alternatively, a dedicated resource pool can be provided for independent SL CSI-RS applications.

[0057] However, if the SL CSI reporting resources are left to the RX UE to determine, there is no efficient way to instruct the TX UE on the configuration, since an SL unicast connection has not yet been established between the TX UE and the RX UE. Currently, there is no efficient method to allow both the TX UE and the RX UE to determine the resources used for CSI reporting.

[0058] To meet the above requirements, a new configuration of resources for SL CSI-RS transmission and SL CSI reporting is needed to support beam management (including initial beam pairing or beam maintenance) on sidelinks in FR2. A new method is required to determine the resources used for CSI reporting.

[0059] Embodiments of this disclosure provide a solution for CSI reporting. In one aspect of the solution, a first UE sends multiple sidelink reference signals on a first resource to a second UE for determining the CSI between the first UE and the second UE. The first UE then determines a second resource based on the first resource for receiving the CSI report. Furthermore, the first UE receives the report from the second UE on the second resource.

[0060] By establishing the association between the first and second resources, this solution facilitates efficient alignment of resources used for CSI reporting between the first and second UEs. In this way, sidelink communication can be improved with increased efficiency.

[0061] The principles and implementation of embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0062] Figure 1An example of a wireless communication system 100 supporting CSI reporting according to various aspects of this disclosure is illustrated. The wireless communication system 100 may include one or more network entities 102 (also referred to as network devices (NEs)), one or more UEs 104, a core network 106, and a packet data network 108. The wireless communication system 100 may support various radio access technologies. In some implementations, the wireless communication system 100 may be a 4G network, such as a Long Term Evolution (LTE) network or an Advanced LTE (LTE-A) network. In some other implementations, the wireless communication system 100 may be a 5G network, such as a New Radio (NR) network. In other implementations, the wireless communication system 100 may be a combination of 4G and 5G networks, or other suitable radio access technologies, including IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), and IEEE 802.20. The wireless communication system 100 may support radio access technologies other than 5G. In addition, the wireless communication system 100 can support technologies such as time division multiple access (TDMA), frequency division multiple access (FDMA), or code division multiple access (CDMA).

[0063] One or more network entities 102 may be distributed throughout a geographic area to form a wireless communication system 100. One or more of the network entities 102 described herein may be, include, or may be referred to as network nodes, base stations, network elements, radio access networks (RANs), base transceiver stations, access points, NodeBs, eNodeBs (eNBs), next-generation NodeBs (gNBs), or other suitable terms. Network entities 102 and UE 104 may communicate via communication link 110, which may be a wireless or wired connection. For example, network entities 102 and UE 104 may perform wireless communication (e.g., receive signaling, send signaling) via a Uu interface.

[0064] Network entity 102 may provide a geographic coverage area 112 for which network entity 102 supports services (e.g., voice, video, packet data, messaging, broadcasting, etc.) for one or more UEs 104 within the geographic coverage area 112. For example, network entity 102 and UE 104 may support wireless communication of signals associated with services (e.g., voice, video, packet data, messaging, broadcasting, etc.) based on one or more wireless access technologies. In some implementations, network entity 102 may be mobile, for example, a satellite associated with a non-terrestrial network. In some implementations, different geographic coverage areas 112 associated with the same or different radio access technologies may overlap, but different geographic coverage areas 112 may be associated with different network entities 102. The information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltage, current, electromagnetic waves, magnetic fields or particles, light fields or particles, or any combination thereof.

[0065] One or more UEs 104 may be distributed throughout the geographic area of ​​the wireless communication system 100. UE 104 may include or be referred to as a mobile device, wireless device, remote device, remote unit, handheld device, subscriber device, or some other suitable term. In some implementations, UE 104 may be referred to as a unit, station, terminal, or client, etc. Additionally or alternatively, UE 104 may be referred to as an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a Machine Type Communication (MTC) device, etc. In some implementations, UE 104 may be stationary within the wireless communication system 100. In some other implementations, UE 104 may be mobile within the wireless communication system 100.

[0066] One or more UEs 104 can be devices of different forms or with different capabilities. Figure 1 The diagram illustrates some examples of UE 104. UE 104 is capable of communicating with various types of devices, such as network entity 102, other UEs 104, or network devices (e.g., core network 106, packet data network 108, relay equipment, integrated access and backhaul (IAB) node, or another network device). Figure 1 As shown. Alternatively or additionally, UE 104 may support communication with other network entities 102 or UE 104 that may act as relays in wireless communication system 100.

[0067] UE 104 can also support direct wireless communication with other UE 104s via communication link 114. For example, UE 104 can support direct wireless communication with another UE 104 via a device-to-device (D2D) communication link. In some implementations, such as vehicle-to-vehicle (V2V) deployments, vehicle-to-everything (V2X) deployments, or cellular V2X deployments, communication link 114 may be referred to as a side link (SL). For example, UE 104 can support direct wireless communication with another UE 104 via a PC5 interface.

[0068] Network entity 102 may support communication with core network 106 or with another network entity 102, or both. For example, network entity 102 may interface with core network 106 via one or more backhaul links 116 (e.g., via S1, N2, N2, or another network interface). Network entities 102 may communicate with each other via backhaul links 116 (e.g., via X2, Xn, or another network interface). In some implementations, network entities 102 may communicate directly with each other (e.g., between network entities 102). In some other implementations, network entities 102 may communicate with each other or indirectly (e.g., via core network 106). In some implementations, one or more network entities 102 may include sub-components, such as access network entities, which may be examples of access node controllers (ANCs). An ANC may communicate with one or more UEs 104 via one or more other access network transport entities (which may be referred to as radio headends, smart radio headends, or transmit-receive points (TRPs)).

[0069] In some implementations, network entity 102 can be configured with a decomposed architecture that can utilize protocol stacks physically or logically distributed across two or more network entities 102, such as an Integrated Access Backhaul (IAB) network, Open RAN (O-RAN) (e.g., a network configuration sponsored by the O-RAN Alliance), or Virtualized RAN (vRAN) (e.g., Cloud RAN (C-RAN)). For example, network entity 102 may include one or more of a Central Unit (CU), Distributed Unit (DU), Radio Unit (RU), RAN Intelligent Controller (RIC) (e.g., near real-time RIC, non-real-time RIC), Service Management and Orchestration (SMO) system, or any combination thereof.

[0070] An RU can also be referred to as a radio headend, intelligent radio headend, remote radio headend (RRH), remote radio unit (RRU), or transmit-receive point (TRP). In a decomposed RAN architecture, one or more components of network entity 102 can be co-located, or one or more components of network entity 102 can be located in distributed locations (e.g., separate physical locations). In some implementations, one or more network entities 102 in a decomposed RAN architecture can be implemented as virtual units (e.g., virtual CU (VCU), virtual DU (VDU), virtual RU (VRU)).

[0071] The functional decomposition between CU, DU, and RU can be flexible and can support different functions based on the functions performed at the CU, DU, or RU (e.g., network layer functions, protocol layer functions, baseband functions, radio frequency functions, and any combination thereof). For example, a protocol stack functional decomposition can be used between the CU and DU, allowing the CU to support one or more layers of the protocol stack and the DU to support one or more different layers of the protocol stack. In some implementations, the CU can host upper-layer protocol layer (e.g., Layer 3 (L3), Layer 2 (L2)) functions and signaling (e.g., Radio Resource Control (RRC), Serving Data Adaptation Protocol (SDAP), Packet Data Convergence Protocol (PDCP)). The CU can connect to one or more DUs or RUs, and one or more DUs or RUs can host lower-layer protocol layer functions and signaling, such as Layer 1 (L1) (e.g., Physical (PHY) layer) or L2 (e.g., Radio Link Control (RLC) layer, Media Access Control (MAC) layer), and each can be at least partially controlled by the CU.

[0072] Alternatively or additionally, a functional split of the protocol stack can be employed between the DU and RU, allowing the DU to support one or more layers of the protocol stack and the RU to support one or more different layers of the protocol stack. The DU can support one or more different cells (e.g., via one or more RUs). In some implementations, the functional split between the CU and DU, or between the DU and RU, can be within a protocol layer (e.g., some functions of the protocol layer can be performed by one of the CU, DU, or RU, while other functions of the protocol layer are performed by different items in the CU, DU, or RU).

[0073] The CU can be further functionally decomposed into CU control plane (CU-CP) and CU user plane (CU-UP) functions. The CU can be connected to one or more DUs via mid-range communication links (e.g., F1, F1-C, F1-U), and the DUs can be connected to one or more RUs via fronthaul communication links (e.g., open fronthaul (FH) interfaces). In some implementations, the mid-range or fronthaul communication links can be implemented based on interfaces (e.g., channels) between layers of a protocol stack supported by the respective network entity 102 communicating via such communication links.

[0074] Core network 106 can support user authentication, access authorization, tracking, connectivity, and other access, routing, or mobility functions. Core network 106 can be an evolved packet core (EPC) or a 5G core (5GC), which may include control plane entities that manage access and mobility (e.g., a mobility management entity (MME), access and mobility management functions (AMF)) and user plane entities that route packets or interconnects to external networks (e.g., a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)). In some implementations, the control plane entities may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management (e.g., data bearers, signaling bearers, etc.) of one or more UEs 104 served by one or more network entities 102 associated with core network 106.

[0075] Core network 106 can communicate with packet data network 108 via one or more backhaul links 116 (e.g., via S1, N2, N3, or another network interface). Packet data network 108 may include application server 118. In some implementations, one or more UEs 104 may communicate with application server 118. UE 104 may establish a session (e.g., Protocol Data Unit (PDU) session, etc.) with core network 106 via network entity 102. Core network 106 can use the established session (e.g., an established PDU session) to route services (e.g., control information, data, etc.) between UE 104 and application server 118. A PDU session may be an example of a logical connection between UE 104 and core network 106 (e.g., one or more network functions of core network 106).

[0076] In the wireless communication system 100, network entity 102 and UE 104 can use the resources of the wireless communication system 100 (e.g., time resources (e.g., symbols, time slots, subframes, frames, etc.) or frequency resources (e.g., subcarriers, carriers)) to perform various operations (e.g., wireless communication). In some implementations, network entity 102 and UE 104 can support different resource structures. For example, network entity 102 and UE 104 can support different frame structures. In some implementations, such as in 4G, network entity 102 and UE 104 can support a single frame structure. In some other implementations, such as in 5G and other suitable radio access technologies, network entity 102 and UE 104 can support various frame structures (i.e., multiple frame structures). Network entity 102 and UE 104 can support various frame structures based on one or more digital technologies.

[0077] One or more digital technologies may be supported in the wireless communication system 100, and the digital technologies may include subcarrier spacing and cyclic prefixes. A first digital technology (e.g., μ=0) may be associated with a first subcarrier spacing (e.g., 15kHz) and a normal cyclic prefix. In some implementations, the first digital technology (e.g., μ=0) associated with the first subcarrier spacing (e.g., 15kHz) may utilize one time slot per subframe. A second digital technology (e.g., μ=1) may be associated with a second subcarrier spacing (e.g., 30kHz) and a normal cyclic prefix. A third digital technology (e.g., μ=2) may be associated with a third subcarrier spacing (e.g., 60kHz) and a normal cyclic prefix or an extended cyclic prefix. A fourth digital technology (e.g., μ=3) may be associated with a fourth subcarrier spacing (e.g., 120kHz) and a normal cyclic prefix. A fifth digital technology (e.g., μ=4) may be associated with a fifth subcarrier spacing (e.g., 240kHz) and a normal cyclic prefix.

[0078] The time intervals of resources (e.g., communication resources) can be organized according to frames (also called radio frames). Each frame can have a duration, for example, 10 milliseconds (ms). In some implementations, each frame can include multiple subframes. For example, each frame can include 10 subframes, and each subframe can have a duration, for example, 1 ms. In some implementations, each frame can have the same duration. In some implementations, each subframe of a frame can have the same duration.

[0079] Alternatively or concurrently, the time intervals of resources (e.g., communication resources) can be organized according to time slots. For example, a subframe may include a certain number (e.g., quantity) of time slots. The number of time slots in each subframe may also depend on one or more digital technologies supported in the wireless communication system 100. For example, a first, second, third, fourth, and fifth digital technology (i.e., μ=0, μ=1, μ=2, μ=3, μ=4) associated with corresponding subcarrier intervals of 15 kHz, 30 kHz, 60 kHz, 120 kHz, and 240 kHz may utilize one time slot per subframe, two time slots per subframe, four time slots per subframe, eight time slots per subframe, and 16 time slots per subframe, respectively. Each time slot may include a certain number (e.g., quantity) of symbols (e.g., OFDM symbols). In some implementations, the number (e.g., quantity) of time slots in a subframe may depend on the digital technology. For a common cyclic prefix, a time slot may include 14 symbols. For an extended cyclic prefix (e.g., applicable to a 60 kHz subcarrier spacing), a time slot may include 12 symbols. The relationship between the number of symbols per time slot, the number of time slots per subframe, and the number of time slots per frame for both regular and extended cyclic prefixes can depend on the digital technique. It should be understood that references to a first digital technique (e.g., μ=0) associated with a first subcarrier spacing (e.g., 15 kHz) can be used interchangeably between subframes and time slots.

[0080] In the wireless communication system 100, the electromagnetic (EM) spectrum can be divided into various categories, frequency bands, frequency channels, etc., based on frequency or wavelength. For example, the wireless communication system 100 can support one or more operating frequency bands, such as frequency range names FR1 (410MHz-7.125GHz), FR2 (24.25GHz-52.6GHz), FR3 (7.125GHz-24.25GHz), FR4 (52.6GHz-114.25GHz), FR4a or FR4-1 (52.6GHz-71GHz), and FR5 (114.25GHz-300GHz). In some implementations, network entity 102 and UE 104 can perform wireless communication on one or more operating frequency bands. In some implementations, FR1 can be used by network entity 102 and UE 104, along with other devices or apparatuses, for cellular communication services (e.g., control information, data). In some implementations, FR2 can be used by network entity 102 and UE 104, along with other devices or apparatuses, for short-range, high data rate capabilities.

[0081] FR1 can be associated with one or more digital technologies (e.g., at least three digital technologies). For example, FR1 can be associated with: a first digital technology (e.g., μ=0) comprising a subcarrier spacing of 15 kHz; a second digital technology (e.g., μ=1) comprising a subcarrier spacing of 30 kHz; and a third digital technology (e.g., μ=2) comprising a subcarrier spacing of 60 kHz. FR2 can be associated with one or more digital technologies (e.g., at least two digital technologies). For example, FR2 can be associated with: a third digital technology (e.g., μ=2) comprising a subcarrier spacing of 60 kHz; and a fourth digital technology (e.g., μ=3) comprising a subcarrier spacing of 120 kHz.

[0082] Now for reference Figure 2A and Figure 2B The illustration shows example process flows 200A and 200B according to some example embodiments of the present disclosure. Process flows 200A and 200B may relate to UE 201 and UE 202 (also referred to as first UE 201 and second UE 202) and BS 203. Process flows 200A and 200B can be applied to reference Figure 1 The wireless communication system 100. For example, UE 201 and 202 can be UE 104, and BS 203 can be network entity 102. It should be understood that process flows 200A and 200B can be applied to other communication scenarios, which will not be described in detail hereafter.

[0083] First refer to Figure 2A ,like Figure 2A As shown, the first UE 201 sends (205) a plurality of sidelink reference signals on the first resource to the second UE 202 for determining the CSI between the first UE 201 and the second UE 202. For example, the sidelink reference signals may include CSI-RS. Alternatively or additionally, the sidelink reference signals may include any other type of reference signal, for example, for beam management or any other purpose, such as determining the CSI. The scope of this disclosure is not limited in this respect. In the following, in some embodiments, CSI-RS will be considered as an example of a sidelink reference signal to provide further details regarding exemplary embodiments of this disclosure.

[0084] In the time domain, multiple sidelink reference signals can be configured as periodic or semi-persistent. In some embodiments, the first UE 201 can determine a first resource based on configuration information. The configuration information can be pre-configured or configured by the BS 203. For example, the configuration information can be configured via RRC signaling. The configuration information may include a period (denoted as T) for transmitting multiple sidelink reference signals. periodicityFor example, the period of CSI-RS transmission. The period can be pre-configured or configured to accommodate the coexistence of multiple UEs. The period can be pre-configured or configured by RP or by BWP.

[0085] In some example embodiments, the first UE 201 may be based on the period and one or more time offsets (denoted as T). offset The first resource is determined by a time offset. A time offset can be called a time-domain offset. One or more time offsets can represent the time-domain offset of a time slot used to transmit sidelink reference signals within a time period relative to the start boundary of that time period. For example, a time offset can define the time-domain offset of an SL CSI-RS time slot within a time period relative to the start boundary of that time period. Multiple time offsets can correspond to multiple configurations. This is beneficial for improving sidelink reference signal resource density and enabling flexible resource utilization.

[0086] In the following sections, further details regarding exemplary embodiments of this disclosure will be provided, using the example of each time slot being used to transmit one sidelink reference signal using one beam. The same applies if each time slot is used to transmit multiple sidelink reference signals using different beams.

[0087] Figure 3A The illustrations depict example resource configurations for SCI-RS transmission according to some example embodiments of this disclosure. For example... Figure 3A As shown, two time offsets (also known as offset 1 and offset 2) can be (pre-)configured. Offset 1 and offset 2 can each correspond to two configurations (also known as configuration 1 and configuration 2).

[0088] One or more time offsets can be determined in various ways. For example, one or more time offsets can be determined by the first UE 201. For example, UE 201 can select one or more time offsets within periodically configured resources for SL CSI-RS. Resource selection can be performed randomly, based on sensing, or based on directional sensing. As another example, one or more time offsets can be assigned to UE 201. For example, one or more time offsets can be configured by BS 203 via DCI or MAC CE.

[0089] After determining one or more time offsets, the first UE 201 can determine multiple time slots for transmitting multiple sidelink reference signals based on the one or more time offsets according to the period. Multiple time slots with one or more time offsets (e.g., different time offsets) within a time period can be consecutive or non-consecutive. To achieve flexible resource allocation, each UE can select or be allocated at least one offset for a given period within the RP or BWP. Therefore, it is possible to accommodate multiple TX UEs coexisting within the same resource pool or BWP.

[0090] In some embodiments, the first UE 201 may send one or more time offsets to the second UE 202 for the second UE 202 to identify resources for receiving multiple sidelink reference signals. For example, one or more time offsets may be sent in an SCI or MAC CE of one of the following: each of multiple time slots, one or more time slots (in other words, a portion of time slots), the first time slot of multiple time slots, or the last time slot of multiple time slots. For example, a list of time offsets determined by the first UE 201 (or allocated by the BS 203) may be sent along with the SL CSI-RS for the second UE to identify resources for transmitting the SL CSI-RS, and such a list may be carried by an SCI or MAC CE in the SL CSI-RS time slots. Furthermore, to indicate beam information, TX beam information and / or RX beam information may be sent along with the SLCSI-RS.

[0091] Referring again to Figure 2, the first UE 201 determines (210) the second resource for receiving CSI reports based on the first resource. Similarly, the second UE 202 determines (215) the second resource for CSI reporting based on the first resource. There may be an association between the first resource and the second resource.

[0092] This association will be discussed in three separate cases: Case 1: The time-domain resource distribution of the second resource is the same as that of the first resource, the frequency-domain resource configuration of the second resource is the same as that of the first resource, and there is a time interval (denoted as T) between the first and second resources. interval (For example, also referred to as the time interval between the SL CSI-RS window and the SL CSI reporting window). This time interval can be used by the second UE 202 to determine the TX and RX beam pairs between the first UE 201 and the second UE 202 based on measurements performed in the SL CSI-RS window. - Case 2: The frequency domain resource configuration of the second resource is the same as that of the first resource, and the time domain resource distribution of the second resource is associated with one or more time offsets indicated by the first UE 201. - Case 3: The temporal resource distribution of the second resource is associated with one or more time offsets indicated by the first UE 201, and the frequency domain resource configuration of the second resource is associated with the frequency domain resource configuration of the first resource.

[0093] In some embodiments of Case 1, the CSI report may use the same resource configuration (in both the time and frequency domains) as the resource configuration used for sidelink reference signal transmission. That is, except for the time interval between the first time slot in the second resource (i.e., the first SL CSI report time slot) and the last time slot in the first resource (i.e., the last sidelink reference signal time slot), the SL CSI report timing follows the same distribution defined by the parameters used for sidelink reference signal transmission. In this case, the time interval can be used to indicate the position of the first time slot within the SL CSI report window. Therefore, to determine the second resource, the first UE 201 may need to obtain the time interval between the first and second resources.

[0094] For example, the time interval can be determined by the first UE 201. In this case, UE 201 can also indicate the time interval to the second UE 202. As an example implementation, the first UE 201 can send the time interval and an indicator of the last time slot in the first resource to the second UE 202. Then, based on the time interval and the indicator of the last time slot in the first resource, the second UE can determine the position of the first time slot in the second resource. As another example implementation, the first UE 201 can send an indication of the interval of the first time slot in the second resource relative to a reference time slot in the first resource to the second UE 202, allowing the second UE to determine the time interval between the first resource and the second resource. The first UE 201 can indicate the reference time slot by sending one of the following: an index of the reference time slot (optionally or additionally, an index of a reference time slot among multiple time slots in the first resource), the number of remaining time slots after the reference signal in the first resource, an indicator of the first time slot in the first resource, or an indicator of the last time slot in the first resource. The above-mentioned additional information associated with the time interval can be sent to the second UE 202 along with one or more time offsets. Therefore, for the sake of brevity, relevant details have been omitted.

[0095] As another example, this time interval can be pre-configured or configured by BS 203. For example, the time interval can be configured via RRC signaling. In this case, the last time slot in the first resource can be indicated to the second UE 202. For example, this time interval may need to be equal to or greater than the processing delay (denoted as T) used to determine the TX-RX beam pair between the first UE 201 and the second UE 202. pro ),Right now T interval ≥ T pro T pro The parameters can reflect the UE capabilities, and the UE capabilities can be (pre)configured.

[0096] After obtaining the time interval, the first UE 201 can determine the second resource based on the time interval, the period, and one or more time offsets.

[0097] Figure 3B The illustration shows a first example resource configuration for CSI-RS transmission and CSI reporting according to some example embodiments of this disclosure. Figure 3B As shown, the number of TX beams for the first UE 201 is represented by M1, and the number of repetitions for each TX beam is represented by M2. In the SL CSI-RS window, the number of SL time slots used to transmit SL CSI-RS can be the product of M1 and M2, i.e., M1 M2. During this time interval, the second UE 202 can determine the TX and RX beam pairs between the first UE 201 and the second UE 202 based on measurements performed in the SL CSI-RS window.

[0098] Aside from the time interval between the SL CSI-RS window and the SL CSI reporting window, the SL CSI reporting timing follows a distribution defined by the parameters transmitted by the SL CSI-RS, as shown in the SL CSI-RS window. In the SL CSI reporting window, the second UE 202 may require M1 SL CSI reporting opportunities to provide feedback on information related to the determined beam pair. Each CSI reporting opportunity corresponds to a TX beam on the first UE side. The second UE 202 can provide feedback on information associated with the determined beam pair using the determined RX beam on the CSI reporting resources corresponding to the determined TX beam. Therefore, the first UE 201 can identify the indication information associated with the determined beam pair by detecting each CSI reporting opportunity with a corresponding TX beam.

[0099] In some embodiments of Case 2, considering that SL CSI reporting and sidelink reference signal transmissions use the same frequency domain resource configuration but different time domain resource configurations, the first UE 201 may need to determine the time domain resource configuration of the second resource. For example, the association between the time domain resource distribution of the second resource and time offsets may include assuming that the first resource supports multiple time offsets, the resource available for CSI reporting can be divided into multiple parts, each of which is associated with one or more transmissions of one or more sidelink reference signals among multiple sidelink reference signals, and has each of the multiple time offsets. Therefore, in this case, the first UE 201 can determine the time domain resources of the second resource based on the above-described resource division associated with different time offsets and one or more time offsets. For example, the association between multiple parts of the resource available for CSI reporting and multiple time offsets can be determined by the first UE 201 and sent to the second UE 202. The above-described association information can be sent to the second UE 202 along with one or more time offsets. For brevity, related details are omitted. Alternatively or additionally, the association between multiple portions of resources available for CSI reporting and multiple time offsets can be pre-configured or configured by BS 203, for example, via RRC signaling. In this case, a time-domain resource set for CSI reporting can be (pre-)configured, which is associated with the time-domain resources of the SL CSI-RS with each time offset.

[0100] Figure 3C The illustration shows a second example resource configuration for CSI-RS transmission and CSI reporting according to some example embodiments of this disclosure. For example... Figure 3C As shown, the SL CSI-RS time slots in Configuration 1 with offset 1 and Configuration 2 with offset 2 follow the same period, but with different time offsets. In the SL CSI report window, resources are divided into multiple parts, each part associated with the corresponding SL CSI-RS resource within the corresponding SL CSI-RS window with offset 1 and offset 2. In other words, the first resource part in the SL CSI report window is associated with offset 1, and the second resource part in the SL CSI report window is associated with offset 2.

[0101] In some embodiments of Case 3, CSI reporting and sidelink reference signal transmission can use different resource configurations in the time domain or frequency domain. The association between the time domain resource distribution of the second resource and one or more time offsets indicated by the first UE 201 can be determined similarly to that described above with reference to Case 2. Therefore, for the sake of brevity, relevant details are omitted. The association between the frequency domain resource configuration of the second resource and the frequency domain resource configuration of the first resource can be determined in a variety of ways.

[0102] For example, the frequency domain start position of the first resource can be associated with the frequency domain start position of the second resource. In this case, the frequency domain resource of the second resource can be determined based on the frequency domain start position of the first resource and the frequency domain size of the second resource. The association and / or frequency domain size between the frequency domain start positions of the first and second resources can be determined by the first UE 201 and sent to the second UE 202. The aforementioned additional information associated with the frequency association can be sent to the second UE 202 along with one or more time offsets. For brevity, related details are omitted. Alternatively or additionally, the aforementioned association-related information can be pre-configured or configured by the BS 203, for example, via RRC signaling.

[0103] As another example, consider the frequency offset between the frequency domain start position of the first resource and the frequency domain start position of the second resource. In this case, the frequency domain resource of the second resource can be determined based on the frequency domain start position of the first resource, the frequency offset, and the frequency domain size of the second resource. The frequency offset and / or frequency domain size can be determined by the first UE 201 and sent to the second UE 202. The aforementioned additional information associated with the frequency association can be sent to the second UE 202 along with one or more time offsets. For brevity, related details are omitted. Alternatively or additionally, the aforementioned association-related information can be pre-configured or configured by the BS 203, for example, via RRC signaling.

[0104] Figure 3D The illustration shows a third example resource configuration for CSI-RS transmission and CSI reporting according to some example embodiments of this disclosure. For example... Figure 3D As shown, the SL CSI-RS time slots in Configuration 1 with offset 1 and Configuration 2 with offset 2 follow the same period but have different time offsets. In the SL CSI reporting window, resources are divided into multiple parts, each associated with a corresponding SL CSI-RS resource within the corresponding SL CSI-RS window with offsets 1 and 2. In other words, the first resource part in the SL CSI reporting window is associated with offset 1, and the second resource part in the SL CSI reporting window is associated with offset 2. In the frequency domain within the SL CSI reporting window, SL CSI-RS transmission and SL CSI reporting use different resource distributions. It may be necessary to determine the association between the frequency resources in the SL CSI-RS window and the SL CSI reporting window. For example, the frequency domain starting position of the resources in the SL CSI report (e.g., Figure 3D F2 in the equation can be defined as the frequency domain starting position of the resource of SL CSI-RS (e.g., Figure 3DThe frequency offset between the frequency domain start position of the resource reported by SL CSI and the frequency domain start position of the resource in SL CSI-RS (e.g., F1 in the report) is also relevant. Alternatively or additionally, the frequency offset between the frequency domain start position of the resource reported by SL CSI and the frequency domain start position of the resource in SL CSI-RS (e.g., F1 in the report) is also relevant. Figure 3D The ΔF in the table can be used to define the relationship between them. The frequency domain size of both SL CSI-RS and SL CSI Report can also be (pre)configured. It is reasonable to fix the size of the frequency domain resources used for both SL CSI-RS and SL CSI Report, since the payload size of either SL CSI-RS or SL CSI Report can be fixed.

[0105] Now for reference Figure 3E Let's discuss a scenario where each SL time slot is used to transmit multiple side link reference signals with the association between the first and second resources in case 1. Figure 3E The illustration shows a fourth example resource configuration for CSI-RS transmission and CSI reporting according to some example embodiments of this disclosure. In this configuration, each SL time slot can be used to transmit multiple SL CSI-RS, and each of the multiple SL CSI-RS can be associated with a beam. The number of TX beams of the first UE 201 is represented by M1, the number of repetitions of each TX beam is represented by M2, and each time slot can contain M2 SL CSI-RS. In the SL CSI-RS window, the number of SL time slots used to transmit SL CSI-RS can be M1. Figure 3E As shown, in the SLCSI reporting window, the second UE 202 may require M1 SL CSI reporting opportunities to provide feedback on information related to the identified beam pair. A time interval may exist between the SL CSI-RS window and the SL CSI reporting window (e.g., determined by T). 间隔 (This is indicated by the text). In this case, the timing of SL CSI reports in the SL CSI report window can follow the same distribution as the SL time slots used to send SL CSI-RS. For example, the timing of SL CSI reports in the SL CSI report window can be determined based on time intervals, periods, and one or more time offsets in the same way as described above.

[0106] For a scenario where each SL time slot is used to transmit multiple side-link reference signals with the association between the first resource and the second resource in case 2, the time-domain resource configuration of the second resource can be determined based on one or more time offsets in the same manner as described above.

[0107] In a scenario where each SL time slot is used to transmit multiple side-link reference signals with the association between the first resource and the second resource in case 3, the time-domain resource configuration of the second resource can be determined based on one or more time offsets in the same manner as described above, and the frequency-domain resource configuration of the second resource can be determined based on the association between the frequency-domain resource configuration of the second resource and the frequency-domain resource configuration of the first resource in a similar manner as described above.

[0108] After identifying the second resource, refer to again Figure 2A The second UE 202 sends a (220) CSI report to the first UE 201 based on the second resource. Therefore, the first UE 201 can monitor the CSI report and thus receive the report on the second resource.

[0109] In some embodiments, the second UE 202 can infer the required CSI and determine a beam pair of the transmit beam of the first UE 201 and the receive beam of the second UE 202 based on multiple measurements (i.e., measurement results) of multiple sidelink reference signals. The second UE 202 can then determine a third resource from the second resource for transmitting the CSI report based on the determined beam pair. The second UE 202 can then transmit the CSI report to the first UE 201 on the third resource. In other words, the second UE 202 can transmit feedback indicating the determined TX beam on the determined SL CSI reporting resource. The CSI report can be carried by the PSSCH. The transmission of the CSI report can occupy an SL time slot.

[0110] Now for reference Figure 2B ,like Figure 2B As shown, BS 203 sends configuration information (225) to the first UE 201 and configuration information (230) to the second UE 202. The configuration information can be pre-configured, configured by RP, or configured by BWP. The configuration information can be configured via RRC signaling.

[0111] Configuration information may include the period used to transmit multiple sidelink reference signals. Alternatively or additionally, configuration information may include one or more of the following: - The minimum time interval between a first resource for transmitting multiple sidelink reference signals and a second resource for transmitting reports associated with multiple measurements of the multiple sidelink reference signals; - The association between multiple parts of the resources available for CSI reporting and multiple time offsets, wherein each of the multiple parts is associated with one or more transmissions of one or more sidelink reference signals among multiple sidelink reference signals, and has each of the multiple time offsets, the time offsets among multiple time offsets representing the time domain offset of the time slot used to transmit one of the multiple sidelink reference signals relative to the start boundary of that time period. - The correlation between the frequency domain starting position of the first resource and the frequency domain starting position of the second resource; - Frequency offset between the frequency domain starting position of the first resource and the frequency domain starting position of the second resource; - The frequency domain size of the first resource; or - The frequency domain size of the second resource.

[0112] If needed, one or more of the above parameters can be configured as described above. For the sake of brevity, relevant details have been omitted.

[0113] According to the reference Figures 2A to 3E In some embodiments, by determining the association between a first resource and a second resource, this solution can facilitate efficient alignment of resources for CSI reporting between a first UE and a second UE. In this way, sidelink communication can be improved with increased efficiency.

[0114] Figure 4 An example of a device 400 supporting CSI reporting according to various aspects of this disclosure is illustrated. Device 400 may be an example of a UE 104 or network entity 102 as described herein. Device 400 may support wireless communication with one or more network entities 102, UE 104, or any combination thereof. Device 400 may include components for bidirectional communication, including components for transmitting and receiving communications (such as processor 402, memory 404, transceiver 406, and optional I / O controller 408). These components may communicate electronically or be otherwise coupled (e.g., operational ground, communication ground, functional ground, electronic ground, electrical ground) via one or more interfaces (e.g., bus).

[0115] Processor 402, memory 404, transceiver 406, or various combinations thereof, or various components thereof, may be examples of components used to perform various aspects of the present disclosure described herein. For example, processor 402, memory 404, transceiver 406, or various combinations thereof, or components thereof, may support methods for performing one or more of the operations described herein.

[0116] In some implementations, processor 402, memory 404, transceiver 406, or various combinations or components thereof may be implemented in hardware (e.g., in a communication management circuitry system). The hardware may include a processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, configured to or otherwise supporting components for performing the functions described in this disclosure. In some implementations, processor 402 and memory 404 coupled to processor 402 may be configured to perform one or more functions described herein (e.g., by executing instructions stored in memory 404 by processor 402).

[0117] For example, according to the examples disclosed herein, processor 402 may support wireless communication at device 400. Processor 402 may be configured to support: means for transmitting, on a first resource, a plurality of sidelink reference signals for determining channel state information (CSI) between the first UE and the second UE to a second UE; means for determining, based on the first resource, a second resource for receiving a report of CSI; and means for receiving a report from the second UE on the second resource. Processor 402 may be configured to support: means for receiving, on the first resource, a plurality of sidelink reference signals for determining channel state information (CSI) between the first UE and the second UE from the first UE; means for determining, based on the first resource, a second resource associated with the report of CSI transmission; and means for transmitting a report to the first UE based on the second resource. Processor 402 may be configured to support: means for transmitting configuration information to a user equipment (UE), the configuration information including a period for transmitting the plurality of sidelink reference signals.

[0118] Processor 402 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some implementations, processor 402 may be configured to use a memory controller to operate a memory array. In some other implementations, the memory controller may be integrated into processor 402. Processor 402 may be configured to execute computer-readable instructions stored in memory (e.g., memory 404) to cause device 400 to perform various functions of this disclosure.

[0119] Memory 404 may include random access memory (RAM) and read-only memory (ROM). Memory 404 may store computer-readable, computer-executable code, including instructions that, when executed by processor 402, cause device 400 to perform the various functions described herein. The code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some implementations, the code may not be directly executed by processor 402, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein. In some implementations, memory 404 may include a basic I / O system (BIOS) that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0120] I / O controller 408 can manage the input and output signals of device 400. I / O controller 408 can also manage peripheral devices not integrated into device 400. In some implementations, I / O controller 408 can represent a physical connection or port to an external peripheral device. In some implementations, I / O controller 408 can utilize an operating system such as iOS®, Android®, MS Windows®, OS / 2®, UNIX®, Linux®, or other known operating systems. In some implementations, I / O controller 408 can be implemented as part of a processor, such as processor 402. In some implementations, a user can interact with device 400 via I / O controller 408 or via hardware components controlled by I / O controller 408.

[0121] In some implementations, device 400 may include a single antenna 410. However, in other implementations, device 400 may have more than one antenna 410 (i.e., multiple antennas), including multiple antenna panels or antenna arrays capable of concurrently transmitting or receiving multiple wireless transmissions. Transceiver 406 may communicate bidirectionally via one or more antennas 410, wired or wireless links, as described herein. For example, transceiver 406 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. Transceiver 406 may also include a modem for modulating packets, providing modulated packets to one or more antennas 410 for transmission, and demodulating packets received from one or more antennas 410. Transceiver 406 may include one or more transmit chains, one or more receive chains, or combinations thereof.

[0122] The transmission chain can be configured to generate and transmit signals (e.g., control information, data, packets). The transmission chain may include at least one modulator for modulating data onto a carrier signal, preparing the signal for transmission over a wireless medium. At least one modulator may be configured to support one or more techniques, such as amplitude modulation (AM), frequency modulation (FM), or digital modulation schemes such as phase shift keying (PSK) or quadrature amplitude modulation (QAM). The transmission chain may also include at least one power amplifier configured to amplify the modulated signal to an appropriate power level suitable for transmission over a wireless medium. The transmission chain may also include one or more antennas 410 for transmitting the amplified signal into the air or wireless medium.

[0123] The receiver chain can be configured to receive signals (e.g., control information, data, packets) via a wireless medium. For example, the receiver chain may include one or more antennas 410 for receiving signals over the air or via a wireless medium. The receiver chain may include at least one amplifier (e.g., a low-noise amplifier (LNA)) configured to amplify the received signal. The receiver chain may include at least one demodulator configured to demodulate the received signal and obtain transmitted data by reversing the modulation technique applied during signal transmission. The receiver chain may include at least one decoder for decoding the demodulated signal to receive the transmitted data.

[0124] Figure 5 An example of a processor 500 supporting CSI reporting according to various aspects of this disclosure is illustrated. Processor 500 may be an example of a processor configured to perform various operations according to the examples described herein. Processor 500 may include a controller 502 configured to perform various operations according to the examples described herein. Processor 500 may optionally include at least one memory 504, such as an L1 / L2 / L3 cache. Additionally or alternatively, processor 500 may optionally include one or more arithmetic logic units (ALUs) 506. One or more of these components may be electronically communicated or otherwise coupled (e.g., operative ground, communicative ground, functional ground, electronic ground, electrical ground) via one or more interfaces (e.g., buses).

[0125] Processor 500 may be a processor chipset and includes a protocol stack (e.g., a software stack) executed by the processor chipset to perform various operations (e.g., receive, acquire, retrieve, send, output, forward, store, determine, identify, access, write, read) according to the examples described herein. The processor chipset may include one or more cores, one or more caches (e.g., memory local to the processor chipset or included in the processor chipset (e.g., processor 500)) or other memory (e.g., random access memory (RAM), read-only memory (ROM), dynamic RAM (DRAM), synchronous dynamic RAM (SDRAM), static RAM (SRAM), ferroelectric RAM (FeRAM), magnetic RAM (MRAM), resistive RAM (RRAM), flash memory, phase-change memory (PCM), etc.).

[0126] Controller 502 can be configured to manage and coordinate various operations of processor 500 (e.g., signaling, receiving, acquiring, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, and reading) to enable processor 500 to support various operations of the UE according to the examples described herein. For example, controller 502 can operate as a control unit of processor 500 to generate control signals for managing the operation of various components of processor 500. These control signals include enabling or disabling functional units, selecting data paths, initiating memory accesses, and coordinating operation timing.

[0127] Controller 502 can be configured to fetch (e.g., obtain, retrieve, receive) instructions from memory 504 and determine subsequent instructions(s) to be executed, enabling processor 500 to support various operations according to the examples described herein. Controller 502 can be configured to track the memory addresses of instructions associated with memory 504. Controller 502 can be configured to decode instructions to determine the operations to be performed and the operands involved. For example, controller 502 can be configured to interpret instructions and determine control signals to be output to other components of processor 500, enabling processor 500 to support various operations according to the examples described herein. Additionally or alternatively, controller 502 can be configured to manage data flow within processor 500. Controller 502 can be configured to control data transfers between registers, arithmetic logic unit (ALU), and other functional units of processor 500.

[0128] Memory 504 may include one or more caches (e.g., memory or other memory, such as RAM, ROM, DRAM, SDRAM, SRAM, MRAM, flash memory, etc., local to or included in processor 500). In some implementations, memory 504 may reside within or on the processor chipset (e.g., local to processor 500). In some other implementations, memory 504 may reside outside the processor chipset (e.g., remote from processor 500).

[0129] Memory 504 may store computer-readable, computer-executable code, including instructions that, when executed by processor 500, cause processor 500 to perform the various functions described herein. The code may be stored in a non-transitory computer-readable medium, such as system memory or another type of memory. Controller 502 and / or processor 500 may be configured to execute computer-readable instructions stored in memory 504 to cause processor 500 to perform various functions. For example, processor 500 and / or controller 502 may be coupled to or coupled to memory 504, and processor 500, controller 502, and memory 504 may be configured to perform the various functions described herein. In some examples, processor 500 may include multiple processors, and memory 504 may include multiple memories. One or more of the multiple processors may be coupled to one or more of the multiple memories, which may be configured individually or collectively to perform the various functions described herein.

[0130] One or more ALU 506s can be configured to support a variety of operations as described in the examples herein. In some implementations, one or more ALU 506s may reside within or on a processor chipset (e.g., processor 500). In some other implementations, one or more ALU 506s may reside outside the processor chipset (e.g., processor 500). One or more ALU 506s can perform one or more calculations on data, such as addition, subtraction, multiplication, and division. For example, one or more ALU 506s can receive input operands and an opcode that determines the operation to be performed. One or more ALU 506s are configured with a variety of logic and arithmetic circuitry, including adders, subtractors, shifters, and logic gates, to process and manipulate data according to the operation. Additionally or alternatively, one or more ALU 506s may support logical operations such as AND, OR, XOR, NOR, and NAND, enabling one or more ALU 506s to handle conditional operations, comparisons, and bitwise operations.

[0131] According to the examples disclosed herein, processor 500 can support wireless communication. Processor 500 can be configured or operable to support: components for transmitting multiple sidelink reference signals for determining channel state information (CSI) between the first UE and the second UE to a second UE on a first resource; components for determining a second resource for receiving a report of CSI based on the first resource; and components for receiving a report from the second UE on the second resource. Processor 500 can be configured or operable to support: components for receiving multiple sidelink reference signals for determining channel state information (CSI) between the first UE and the second UE from the first UE on the first resource; components for determining a second resource associated with the report of CSI transmission based on the first resource; and components for transmitting a report to the first UE based on the second resource. Processor 500 can be configured or operable to support: components for transmitting configuration information to a user equipment (UE), the configuration information including the period for transmitting the multiple sidelink reference signals.

[0132] Figure 6 A flowchart illustrating a method 600 supporting CSI reporting according to various aspects of this disclosure is shown. Operation of method 600 may be implemented by the device or components thereof described herein. For example, operation of method 600 may be performed by UE 201 described herein. In some implementations, the device may execute a set of instructions to control the functional elements of the device to perform the described functions. Additionally or alternatively, the device may use dedicated hardware to perform aspects of the described functions.

[0133] At 610, the method may include sending multiple sidelink reference signals on the first resource to the second UE for determining channel state information (CSI) between the first UE and the second UE. The operation of 610 can be performed according to the examples described herein. In some implementations, aspects of the operation of 610 may be determined by reference... Figure 2A and Figure 2B The aforementioned UE 201 is executed.

[0134] At 620, the method may include determining a second resource for receiving CSI reports based on a first resource. The operation of 620 can be performed according to the examples described herein. In some implementations, aspects of the operation of 620 may be derived from references... Figure 2A and Figure 2B The aforementioned UE 201 is executed.

[0135] At 630, the method may include receiving a report from a second UE on a second resource. The operation of 630 can be performed according to the examples described herein. In some implementations, aspects of the operation of 630 may be derived from references. Figure 2A and Figure 2BThe aforementioned UE 201 is executed.

[0136] In some implementations, the method may also include determining a first resource based on configuration information, including the period for transmitting multiple sidelink reference signals.

[0137] In some implementations, the configuration information is pre-configured or configured by the base station (BS).

[0138] In some implementations, the configuration information is pre-configured or configured per resource pool (RP) or per bandwidth portion (BWP).

[0139] In some implementations, configuration information is configured via Radio Resource Control (RRC) signaling.

[0140] In some implementations, determining the first resource includes: determining multiple time slots for transmitting multiple sidelink reference signals based on the period and one or more time offsets, wherein the time offset in the one or more time offsets represents the time-domain offset of a time slot for transmitting one of the multiple sidelink reference signals relative to the start boundary of the time period.

[0141] In some implementations, one or more time offsets are one of the following: determined by the first UE; or configured by the BS.

[0142] In some implementations, the method may also include sending one or more time offsets to a second UE.

[0143] In some implementations, one or more time offsets are sent in one of the following: Side Link Control Information (SCI) or Media Access Control Control Element (MAC CE) in one of the following: each of multiple time slots; one or more of multiple time slots; the first time slot of multiple time slots; or the last time slot of multiple time slots.

[0144] In some implementations, determining the second resource includes: determining that the time-domain resource distribution of the second resource is the same as that of the first resource, the frequency-domain resource configuration of the second resource is the same as that of the first resource, and there is a time interval between the first resource and the second resource; obtaining the time interval; and determining the time-domain resources in the second resource based on the time interval, the period, and one or more time offsets.

[0145] In some implementations, the time interval is determined by the first UE; or pre-configured or configured by the BS.

[0146] In some implementations, the time interval is determined by a first UE, and the method further includes sending an indicator of the time interval and the last time slot in the first resource to a second UE.

[0147] In some implementations, the time interval is determined by a first UE, and the method further includes sending to a second UE an indication of the interval of a first time slot in a second resource relative to a reference time slot in a first resource; and one of the following for determining the reference time slot: an index of the reference time slot; the number of remaining time slots after the reference signal in the first resource; an indicator of the first time slot in the first resource; or an indicator of the last time slot in the first resource.

[0148] In some implementations, resources available for CSI reporting are divided into multiple parts in the time domain, each of which is associated with one or more transmissions of one or more sidelink reference signals among a plurality of sidelink reference signals, and has each of a plurality of time offsets, the one or more time offsets being one or more of the plurality of time offsets, and determining a second resource includes: determining the time domain resources of the second resource based on the one or more time offsets.

[0149] In some implementations, the association between a portion of a resource available for CSI reporting and a corresponding time offset in one or more time offsets is one of the following: determined by a first UE and sent to a second UE; or pre-configured or configured by a BS.

[0150] In some implementations, the frequency domain resource configuration of the second resource is the same as that of the first resource.

[0151] In some implementations, determining the second resource further includes determining the frequency domain resource of the second resource based on one of the following: the association between the frequency domain start position of the first resource and the frequency domain start position of the second resource; the frequency offset between the frequency domain start position of the first resource and the frequency domain start position of the second resource; or the frequency domain size of the second resource.

[0152] In some implementations, the association, frequency offset, or frequency domain size between the frequency domain start position of the first resource and the frequency domain start position of the second resource is determined by the first UE and sent to the second UE; or pre-configured or configured by the BS.

[0153] Figure 7 A flowchart illustrating a method 700 supporting CSI reporting according to various aspects of this disclosure is shown. Operation of method 700 may be implemented by the device or components thereof described herein. For example, operation of method 700 may be performed by UE 202 described herein. In some implementations, the device may execute a set of instructions to control the functional elements of the device to perform the described functions. Additionally or alternatively, the device may use dedicated hardware to perform aspects of the described functions.

[0154] At 710, the method may include: receiving, on a first resource, multiple sidelink reference signals from a first UE for determining channel state information (CSI) between the first UE and a second UE. The operation of 710 can be performed according to the examples described herein. In some implementations, aspects of the operation of 710 may be determined by reference... Figure 2A and Figure 2B The aforementioned UE 202 is executed.

[0155] At 720, the method may include: determining a second resource associated with sending the CSI report, based on the first resource. The operation at 720 can be performed according to the examples described herein. In some implementations, aspects of the operation at 720 may be derived from references... Figure 2A and Figure 2B The aforementioned UE 202 is executed.

[0156] At 730, the method may include: sending a report to the first UE based on a second resource. The operation at 730 can be performed according to the examples described herein. In some implementations, aspects of the operation at 730 may be derived from references. Figure 2A and Figure 2B The aforementioned UE 202 is executed.

[0157] In some implementations, the method may further include: determining a beam pair of the transmit beam of the first UE and the receive beam of the second UE based on multiple measurements of multiple side-link reference signals; and determining a third resource for sending a report from a second resource based on the beam pair, and sending a report based on the second resource includes: sending a report to the first UE on the third resource.

[0158] In some implementations, the method may further include: determining a first resource based on configuration information, including a period for transmitting multiple sidelink reference signals.

[0159] In some implementations, the configuration information is pre-configured or configured by the base station (BS).

[0160] In some implementations, the configuration information is pre-configured or configured per resource pool (RP) or per bandwidth portion (BWP).

[0161] In some implementations, configuration information is configured via Radio Resource Control (RRC) signaling.

[0162] In some implementations, determining the first resource includes: determining multiple time slots for transmitting multiple sidelink reference signals based on the period and one or more time offsets, wherein the time offset in the one or more time offsets represents the time-domain offset of a time slot for transmitting one of the multiple sidelink reference signals relative to the start boundary of the time period.

[0163] In some implementations, the method may also include receiving one or more time offsets from a first UE.

[0164] In some implementations, one or more time offsets are sent in one of the following: Side Link Control Information (SCI) or Media Access Control Control Element (MAC CE) in one of the following: each of multiple time slots; one or more of multiple time slots; the first time slot of multiple time slots; or the last time slot of multiple time slots.

[0165] In some implementations, determining the second resource includes: determining that the time-domain resource distribution of the second resource is the same as that of the first resource, the frequency-domain resource configuration of the second resource is the same as that of the first resource, and there is a time interval between the first resource and the second resource; determining the time interval; and determining the time-domain resources in the second resource based on the time interval, the period, and one or more time offsets.

[0166] In some implementations, the time interval is received from the first UE, or pre-configured or configured by the BS.

[0167] In some implementations, the receive time interval includes: the receive time interval from the first UE and an indicator of the last time slot in the first resource.

[0168] In some implementations, the receiving time interval includes receiving from the first UE: an indication of the interval between a first time slot in the second resource and a reference time slot in the first resource; and one of the following for determining the reference time slot: an index of the reference time slot; the number of remaining time slots after the reference signal in the first resource; an indicator of the first time slot in the first resource; or an indicator of the last time slot in the first resource.

[0169] In some implementations, resources available for CSI reporting are divided into multiple parts in the time domain, each of which is associated with one or more transmissions of one or more sidelink reference signals among a plurality of sidelink reference signals, and has each of a plurality of time offsets, the one or more time offsets being one or more of the plurality of time offsets, and determining a second resource includes: determining the time domain resources of the second resource based on the one or more time offsets.

[0170] In some implementations, the association between a portion of a resource available for CSI reporting and a corresponding time offset in one or more time offsets is one of the following: received from a first UE; or pre-configured or configured by the BS.

[0171] In some implementations, the frequency domain resource configuration of the second resource is the same as that of the first resource.

[0172] In some implementations, determining the second resource further includes determining the frequency domain resource of the second resource based on one of the following: the association between the frequency domain start position of the first resource and the frequency domain start position of the second resource; the frequency offset between the frequency domain start position of the first resource and the frequency domain start position of the second resource; or the frequency domain size of the second resource.

[0173] In some implementations, the association, frequency offset, or frequency domain size between the frequency domain start position of the first resource and the frequency domain start position of the second resource is one of the following: received from the first UE; or pre-configured or configured by the BS.

[0174] Figure 8 A flowchart illustrating a method 800 supporting CSI reporting according to various aspects of this disclosure is shown. Operation of method 800 may be implemented by the device or components thereof described herein. For example, operation of method 800 may be performed by the BS203 described herein. In some implementations, the device may execute a set of instructions to control the functional elements of the device to perform the described functions. Additionally or alternatively, the device may use dedicated hardware to perform aspects of the described functions.

[0175] At 810, the method may include sending configuration information to the user equipment (UE), the configuration information including a period for transmitting multiple sidelink reference signals. The operation of 810 can be performed according to the examples described herein. In some implementations, aspects of the operation of 810 may be determined by reference... Figure 2A and Figure 2B The aforementioned BS 203 is executed.

[0176] In some implementations, the configuration information is pre-configured or configured per resource pool (RP) or per bandwidth portion (BWP).

[0177] In some implementations, configuration information is configured via Radio Resource Control (RRC) signaling.

[0178] In some implementations, the configuration information also includes one of the following: a minimum time interval between a first resource for transmitting multiple sidelink reference signals and a second resource for transmitting reports associated with multiple measurements of the multiple sidelink reference signals; an association between multiple portions of a resource available for CSI reporting and multiple time offsets, wherein each of the multiple portions is associated with one or more transmissions of one or more sidelink reference signals among the multiple sidelink reference signals, and has each of the multiple time offsets representing a time-domain offset of a time slot used to transmit one of the multiple sidelink reference signals relative to the start boundary of that time period; an association between the frequency-domain start position of the first resource and the frequency-domain start position of the second resource; a frequency offset between the frequency-domain start position of the first resource and the frequency-domain start position of the second resource; the frequency-domain size of the first resource; or the frequency-domain size of the second resource.

[0179] It should be noted that the methods described in this paper describe possible implementations, and the operations and steps can be rearranged or otherwise modified, and other implementations are also possible. Furthermore, aspects from two or more methods can be combined.

[0180] The various illustrative blocks and components disclosed herein can be implemented or executed using a general-purpose processor, DSP, ASIC, CPU, FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware component or any combination thereof designed to perform the functions described herein. The general-purpose processor may be a microprocessor, but alternatively, the processor may be any processor, controller, microcontroller or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors combined with a DSP core, or any other such configuration).

[0181] The functions described herein can be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions can be stored on or transmitted via a computer-readable medium as one or more instructions or code. Other examples and implementations are within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described herein can be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination thereof. Features implementing the functions can also be physically located in various locations, including being distributed such that portions of the functions are implemented in different physical locations.

[0182] Computer-readable media include both non-transitory computer storage media and communication media, with communication media including any medium that facilitates the transfer of a computer program from one place to another. Non-transitory storage media can be any available medium that can be accessed by a general-purpose or special-purpose computer. For example, non-transitory computer-readable media can include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, optical disc (CD) ROM or other optical disc storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store desired program code in the form of instructions or data structures and can be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor.

[0183] As used herein, including in the claims, the article “a” preceding an element is unrestricted and should be understood to mean “at least one” or “one or more” of those elements. The terms “a,” “at least one,” “one or more,” and “at least one of one or more” are interchangeable. As used herein, including in the claims, the use of “or” in a list of items (e.g., a list of items beginning with phrases such as “at least one of…” or “one or more of…” or “one or two of…”) indicates an inclusive list, such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Furthermore, as used herein, the phrase “based on” should not be construed as a reference to a closed set of conditions. For example, an example step described as “based on condition A” without departing from the scope of this disclosure could be based on both condition A and condition B. In other words, as used herein, the phrase “based on” should be interpreted in the same manner as the phrase “at least partially based on.” Furthermore, as used herein, including in the claims, “set” can include one or more elements.

[0184] The description provided herein is intended to enable those skilled in the art to make or use this disclosure. Various modifications to this disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the scope of this disclosure. Therefore, this disclosure is not limited to the examples and designs described herein, but should be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A first user equipment (UE), comprising: At least one memory; as well as At least one processor, coupled to the at least one memory, and configured such that the first UE: Multiple sidelink reference signals are sent to the second UE on the first resource to determine the channel state information (CSI) between the first UE and the second UE. Based on the first resource, a second resource is determined for receiving the CSI report; as well as The report is received from the second UE on the second resource.

2. The first UE according to claim 1, wherein the at least one processor is further configured to cause the first UE to: The first resource is determined based on configuration information, which includes the period for transmitting the plurality of sidelink reference signals.

3. The first UE according to claim 2, wherein determining the first resource includes: Based on the period and one or more time offsets, multiple time slots for transmitting the plurality of sidelink reference signals are determined, wherein the time offset in the one or more time offsets represents the time domain offset of the time slot for transmitting one of the plurality of sidelink reference signals relative to the start boundary of the time period.

4. The first UE according to claim 3, wherein the one or more time offsets are one of the following: Determined by the first UE; or Configured by the base station (BS).

5. The first UE according to claim 3, wherein the at least one processor is further configured such that the first UE: Send the one or more time offsets to the second UE.

6. The first UE according to claim 5, wherein the one or more time offsets are transmitted in one of the following: Sidelink control information (SCI) or media access control element (MAC CE) from one of the following: Each of the plurality of time slots; One or more of the plurality of time slots; The first time slot among the plurality of time slots; or The last time slot among the multiple time slots.

7. The first UE according to claim 3, wherein determining the second resource includes: The time-domain resource distribution of the second resource is the same as that of the first resource, the frequency-domain resource configuration of the second resource is the same as that of the first resource, and there is a time interval between the first resource and the second resource. Obtain the time interval; as well as The time-domain resources in the second resource are determined based on the time interval, the period, and the one or more time offsets.

8. The first UE according to claim 7, wherein the time interval: Determined by the first UE; or Pre-configured or configured by the BS.

9. The first UE of claim 3, wherein the resources available for CSI reporting are divided into multiple portions in the time domain, each of the multiple portions being associated with one or more transmissions of one or more sidelink reference signals of the multiple sidelink reference signals, and having each of a multiple time offsets, the one or more time offsets being one or more of the multiple time offsets, and wherein determining the second resource includes: Based on the one or more time offsets, the time-domain resources of the second resource are determined.

10. The first UE of claim 9, wherein the association between a portion of the plurality of portions of the resource available for CSI reporting and a corresponding time offset in the one or more time offsets is one of the following: Determined by the first UE and sent to the second UE; or Pre-configured or configured by the BS.

11. The first user equipment according to claim 9, wherein the frequency domain resource configuration of the second resource is the same as the frequency domain resource configuration of the first resource.

12. A second user equipment (UE), comprising: At least one memory; as well as At least one processor, coupled to the at least one memory, and configured such that the second UE: On a first resource, multiple sidelink reference signals are received from a first UE to determine the channel state information (CSI) between the first UE and the second UE. Based on the first resource, determine a second resource associated with the report that sent the CSI; as well as The report is sent to the first UE based on the second resource.

13. The second UE according to claim 12, The at least one processor is further configured such that the first UE: Based on multiple measurements of the multiple side-link reference signals, a beam pair of the transmit beam of the first UE and the receive beam of the second UE is determined; and Based on the beam pair, a third resource for transmitting the report is determined from the second resource, and Sending the report based on the second resource includes: The report is sent to the first UE on the third resource.

14. The second UE of claim 12, wherein the at least one processor is further configured such that the second UE: The first resource is determined based on configuration information, which includes the period for transmitting the plurality of sidelink reference signals.

15. The second UE of claim 14, wherein determining the first resource includes: Based on the period and one or more time offsets, multiple time slots for transmitting the plurality of sidelink reference signals are determined, wherein the time offset in the one or more time offsets represents the time domain offset of the time slot for transmitting one of the plurality of sidelink reference signals relative to the start boundary of the time period.

16. The second UE of claim 15, wherein the at least one processor is further configured such that the second UE: Receive the one or more time offsets from the first UE.

17. The second UE of claim 15, wherein determining the second resource includes: The time-domain resource distribution of the second resource is the same as that of the first resource, the frequency-domain resource configuration of the second resource is the same as that of the first resource, and there is a time interval between the first resource and the second resource. Determine the time interval; as well as The time-domain resources in the second resource are determined based on the time interval, the period, and the one or more time offsets.

18. The second UE of claim 15, wherein the resources available for CSI reporting are divided into a plurality of portions in the time domain, each of the plurality of portions being associated with one or more transmissions of one or more sidelink reference signals of the plurality of sidelink reference signals, and having each of a plurality of time offsets, the one or more time offsets being one or more of the plurality of time offsets, and wherein determining the second resource includes: Based on the one or more time offsets, the time-domain resources of the second resource are determined.

19. A base station (BS), comprising: At least one memory; as well as At least one processor, coupled to the at least one memory, and configured such that the BS: Send configuration information to the user equipment (UE), the configuration information including the period for sending multiple sidelink reference signals.

20. The base station according to claim 19, wherein the configuration information further includes one of the following: The minimum time interval between a first resource for transmitting the plurality of sidelink reference signals and a second resource for transmitting reports associated with the plurality of measurements of the plurality of sidelink reference signals; The association between multiple portions of resources available for CSI reporting and multiple time offsets, wherein each of the multiple portions is associated with one or more transmissions of one or more sidelink reference signals among the multiple sidelink reference signals, and has each of the multiple time offsets representing the time-domain offset of a time slot used to transmit one of the multiple sidelink reference signals within a time period relative to the start boundary of the time period; The association between the frequency domain start position of the first resource and the frequency domain start position of the second resource; The frequency offset between the frequency domain start position of the first resource and the frequency domain start position of the second resource; The frequency domain size of the first resource; or The frequency domain size of the second resource.

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