Method for sending SL SCI report and user equipment

Abstract

The present disclosure provides a method for sending an SL SCI report executed by a user equipment, comprising: when an SL CSI report is triggered, determining whether a valid SL transmission resource is present; when a valid SL transmission resource is present, determining whether a carrier to which the SL transmission resource pertains is the same as a carrier associated with the SL CSI report; and when the SL transmission resource is the same as the carrier associated with the SL CSI report, instructing to generate an SL CSI report MAC CE in a multiplexing and combination process, and sending, on the SL transmission resource, a MAC PDU comprising the SL CSI report MAC CE to the user equipment that sends the SCI.

Description

Method for sending SL SCI report and user equipment Technical Field

[0001] The present disclosure relates to the field of wireless communication technology, and in particular to a method for sending an SL SCI report performed by a user equipment and a corresponding user equipment. Background Art

[0002] Vehicle-to-Everything (V2X) is a new generation of information and communication technology that connects vehicles to everything. V represents the vehicle, and X represents anything that interacts with the vehicle. Currently, X primarily includes vehicles, people, roadside infrastructure, and networks.

[0003] In a pair of UEs conducting V2X service communications, they communicate via a sidelink (SL). UEs conducting SL communication are also called SL UEs. UEs at both ends of the SL link can be categorized as transmitting UEs (TX UEs) and receiving UEs (RX UEs) based on their transmission and reception functions. From the perspective of one UE, the other UE is the peer UE.

[0004] In order to improve the throughput of Sidelink communication transmission, the TX UE may operate in a carrier aggregation (CA) mode, that is, the TX UE may operate on multiple carriers simultaneously to transmit data.

[0005] Sidelink communication uses a link detection method based on CSI measurement. The TX UE can transmit the SL CSI reference signal to the RX UE, triggering the RX UE to generate an SL CSI report. The RX UE includes the generated SL CSI report in the SL CSI MAC CE and sends it to the TX UE.

[0006] In multi-carrier aggregation mode, a UE operates on multiple carriers, each capable of performing SLCSI measurement and reporting. This can lead to the following issues: when the RX UE generates an SLCSI MAC CE based on the SLCSI measurement on one carrier and sends it to the TX UE, if the TX UE cannot identify the carrier corresponding to the received SLCSI MAC CE, the TX UE may misinterpret the SLCSI report for carrier A as the SLCSI report for carrier B. To avoid this situation, a solution is needed.

[0007] Summary of the Invention

[0008] The present disclosure proposes a method for sending an SL SCI report performed by a user equipment and a corresponding user equipment to solve at least some of the above problems.

[0009] According to one aspect of the present disclosure, a method for sending an SL SCI report performed by a user equipment is provided, including: when there is a triggered SL CSI report, determining whether there is a valid SL transmission resource; when there is a valid SL transmission resource, determining whether the carrier to which the SL transmission resource belongs is the same as the carrier associated with the SL CSI report; and when the SL transmission resource is the same as the carrier associated with the SL CSI report, indicating the generation of an SL CSI report MAC CE in the multiplexing and combining process, and sending a MAC PDU containing the SL CSI report MAC CE to the sending user equipment sending the SCI on the SL transmission resource.

[0010] According to another aspect of the present disclosure, there is provided another method for sending an SL SCI report performed by a user equipment, comprising: when there is a triggered SL CSI report, determining whether there is a valid SL transmission resource; when there is a valid SL transmission resource, sending the SL CSI report on the SL transmission resource to the sending user equipment that sends the SCI that triggers the SL CSI report, the SL CSI report including a given carrier identifier associated with the SL CSI report. The carrier identifier is determined by at least one of the following: using the carrier identifier of the carrier receiving the SCI as the given carrier identifier; using the carrier identifier of the carrier corresponding to the SL CSI measurement of the SL CSI report as the given carrier identifier; using the carrier identifier of the carrier associated with the SL CSI report indicated by the SCI as the given carrier identifier.

[0011] According to another aspect of the present disclosure, a user equipment is provided, comprising: a processor; and a memory, wherein the memory stores instructions; wherein when the instructions are executed by the processor, the user equipment executes the method provided by the present disclosure.

[0012] According to the present disclosure, the transmitting UE that sends the SCI can accurately identify the carrier corresponding to the SL CSI report received from the receiving UE. In addition, according to the present disclosure, the transmitting UE that sends the SCI can accurately identify the carrier corresponding to the SL CSI report received from the receiving UE without expanding the space of the existing SL CSI report MAC CE. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The above and other features of the present disclosure will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0014] FIG1 is a flowchart of a method for sending an SL SCI report performed by a user equipment according to one disclosed embodiment.

[0015] FIG2 is a flowchart of an example of determining associated carriers in one embodiment of the present disclosure.

[0016] FIG3 is a flowchart of a method for sending an SL SCI report performed by a user equipment according to another disclosed embodiment.

[0017] FIG4 is a block diagram illustrating a user equipment according to an embodiment of the present disclosure.

[0018] It should be noted that the drawings are not necessarily drawn to scale, emphasis instead being placed on illustrating the principles of the technology disclosed herein. In addition, for clarity, like reference numerals throughout the drawings refer to like elements. DETAILED DESCRIPTION

[0019] The present disclosure is described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the present disclosure is not limited to the specific embodiments described below. In addition, for the sake of simplicity, detailed descriptions of known technologies that are not directly related to the present disclosure are omitted to prevent confusion in understanding the present disclosure.

[0020] Before the detailed description, some terms mentioned in this disclosure are explained as follows. Unless otherwise specified, the terms involved in this disclosure have the following meanings.

[0021] UE User Equipment

[0022] RLF Radio Link Failure

[0023] NR New Radio Next Generation Wireless Technology

[0024] LTE Long Term Evolution

[0025] Elte Enhaced Long Term Evolution

[0026] RRC Radio Resource Control

[0027] PDCP Packet Data Convergence Protocol Packet Data Convergence Protocol (layer)

[0028] RLC Radio Link Control, radio link control (layer)

[0029] MAC Medium Access Control (layer)

[0030] PHY physical layer

[0031] MAC CE Medium Access Control Control Element Media Access Control Layer Control Element

[0032] PDU Protocol Data Unit

[0033] UE User Equipment

[0034] NR New Radio Next Generation Wireless Technology

[0035] Sidelink

[0036] V2X Vechile to Everything vehicle-to-everything communication

[0037] PSSCH Physical Sidelink Shared Channel Physical side link shared channel

[0038] PSFCH Physical Sidelink Feedback Channel

[0039] PSCCH Physical Sidelink Control Channel

[0040] HARQ Hybrid Automatic Repeat Request Hybrid Automatic Repeat Request

[0041] CSI report Channel Status Information report Channel Status Information report

[0042] CSI RS Channel Status Information Reference Signaling Channel Status Information Reference Message

[0043] SCI Sidelink Control Information Sidelink control information

[0044] SL-SCH Sidelink Shared Channel Sidelink Shared Channel

[0045] SCI Sidelink Control Information

[0046] The SCI is generally used to indicate the transmission of the SL-SCH and whether HARQ feedback is enabled.

[0047] An SCI consists of the first-stage SCI and the second-stage SCI. The first-stage SCI is transmitted on the PSCCH, while the second-stage SCI is transmitted on the PSSCH. The transport blocks indicated in the SCI are also transmitted on the PSSCH.

[0048] The MAC entity monitors the PSCCH channel (monitor PSCCH) at the PSCCH durations.

[0049] If the first-level SCI is received on the PSCCH channel, the UE can determine the reception timing of the second-level SCI and the transmission block (TB) based on the content of the first-level SCI. When the second-level SCI is received, the UE can obtain or store the valid SCI.

[0050] The SCI can carry a domain value for requesting an SL CSI report. For example, setting the value of the CSIrequest domain to '1' indicates that the RX UE is requested to report an SL CSI report. After receiving the SCI, the RX UE can trigger an SL CSI report. When there are valid SL transmission resources, the MAC entity of the RX UE can instruct the generation of an SL CSI reportMAC CE and send it to the TX UE in the valid SL transmission resources, while canceling the triggered SL CSI report. The valid SL transmission resources here generally refer to the SL resources allocated to the first transmission or new transmission.

[0051] To generate the SL CSI report, the RX UE needs to measure the reference signal SL CSIRS. The transmission of the SL CSI RS can be determined based on the following pre-configured parameters, so as to perform the measurement.

[0052] -sl-CSI-RS-FirstSymbol indicates the first OFDM symbol on a PRB used for SL CSI-RS;

[0053] -sl-CSI-RS-FreqAllocation indicates the number of antenna ports and the frequency domain allocated to SL CSI-RS

[0054] SL Grant

[0055] The SL grant can be automatically generated / created by the UE's MAC entity. The SL grant is used to determine the transmission timing of the PSCCH and the PSSCH, where the PSCCH is used to transmit the SCI and the PSSCH is used to transmit the SL-SCH information. When the MAC determines to create an SL grant, the MAC first selects the resource, that is, on which resource to determine the SL grant. It then further determines the transmission opportunities on the selected resource and considers the opportunities as the SL grant, thus completing the creation of the SL grant.

[0056] The TX UE and RX UE are connected via the PC5 (ProSe protocol 5) interface. The PC5 interface is the interface for control plane and user plane sidelink communication between UEs. For sidelink unicast, the PC5-RRC connection is an access stratum (AS layer) logical connection between a pair of source layer 2 IDs and a target layer 2 ID. The establishment of a PC5 unicast link corresponds to the establishment of a PC5-RRC connection. PC5-RRC messages are messages transmitted over the PC5-RRC connection and are primarily generated and processed by the UE's PC5 RRC layer. PC5 RRC reconfiguration messages are PC5 RRC messages. The PC5-S connection is a non-access stratum (NAS) layer logical connection between a pair of source layer 2 IDs and a target layer 2 ID, or can be considered a logical connection at the higher layer of sidelink communication. PC5-S messages (also called PC5-S signaling) are messages or signaling transmitted over the PC5 non-access stratum and are primarily generated or processed by the non-access stratum of the PC5 interface.

[0057] In this article, PC5 unicast link or PC5-S connection can be referred to as PC5 connection. Such a connection corresponds to a pair of source layer 2 ID and target layer 2 ID. This pair of source layer 2 ID and target layer 2 ID can be called the destination information corresponding to the connection.

[0058] In this article, the terms associated, corresponding, and relevant can be used interchangeably.

[0059] In this article, the terms sidelink and V2X sidelink can be used interchangeably.

[0060] In this article, sidelink and PC5 are used interchangeably.

[0061] The prefix "SL-" in this article emphasizes that the discussion focuses on side links. If similar problems exist on other links, the methods mentioned in this article can also be used to solve them.

[0062] The UEs at both ends of the SL link can be divided into transmitting UEs (TX UEs) and receiving UEs (RX UEs) based on their transmission and reception functions. From the perspective of one UE, the other UE is the peer UE (peer UE). In this article, the UE primarily refers to the RX UE, while the peer UE is the TX UE. The TX UE transmits the SCI and measurement reference signals, while the RX UE receives the SCI from the TX UE and detects the measurement reference signals.

[0063] Unless otherwise specified, the UE in the following text generally refers to the RX UE.

[0064] Carrier Aggregation (CA)

[0065] In the carrier aggregation (CA) mode, the TX UE can work on multiple carriers at the same time to send data. Each carrier has its corresponding HARQ entity, which can perform HARQ-based SL RLF detection separately.

[0066] Different carriers can operate at different frequencies or at the same frequency, which is not distinguished in this article.

[0067] In one case, the carrier can be reflected in the form of a resource pool, that is, different resource pools represent different carriers, and the UE can work on multiple resource pools simultaneously to send data, which is equivalent to the UE working on multiple carriers. Therefore, "resource pool" and "carrier" can be used interchangeably in this article.

[0068] The TX UE may provide the RX UE with carrier configuration information and use a carrier identity (Carrier Idenity) to identify each carrier.

[0069] The carrier identification information can be directly indicated to the UE, or can be obtained based on the frequency used for reception or transmission, or the frequency of the measurement reference signal, especially when different carriers correspond to different frequency ranges.

[0070] The following describes the method for sending an SL SCI report provided by the present disclosure with reference to the accompanying drawings. The order of the steps shown in the figures is only an example and can be changed as needed in actual applications. The method described below is executed by the RX UE.

[0071] FIG1 is a flowchart of a method for sending an SL SCI report performed by a user equipment according to one disclosed embodiment.

[0072] As shown in FIG1 , at S101 , the RX UE determines whether there is a triggered SL CSI report.

[0073] When there is a triggered SL CSI report, at S103 , the RX UE determines whether there are valid SL transmission resources.

[0074] When there is a valid SL transmission resource, at S105 , the RX UE determines whether the carrier to which the valid SL transmission resource belongs is the same as the carrier associated with the triggered SL CSI report.

[0075] When the SL transmission resource is the same as the carrier associated with the SL CSI report, at S107 , the RX UE instructs the generation of the SL CSI report MAC CE in the multiplexing and combining process.

[0076] Then, at S109, the RX UE transmits a MAC PDU including the generated SL CSI report MAC CE to the TX UE on the SL transmission resource. Here, the TX UE is the user equipment that transmits the SCI that triggers the SL CSI report.

[0077] The carrier associated with the SL CSI report can be agreed upon between the TX UE that sends the SCI and the RX UE that receives the SCI and triggers the SL CSI report. The TX UE can determine the "carrier corresponding to the SL CSI report" based on the correspondence between the "carrier associated with the SL CSI report" and the "carrier corresponding to the SL CSI report". Here, the "carrier corresponding to the SL CSI report" refers to the carrier where the frequency resource for the SL CSI measurement indicated by the SCI is located.

[0078] In one example, the carrier associated with the SL CSI report may be the carrier on which the frequency resource receiving the above-mentioned SCI is located. The TX UE and the RX UE may agree that when the RX UE receives the SCI indicating that the SL CSI measurement is to be performed, the RX UE sends the SL CSI report after performing the SL SCI measurement to the TX UE on the carrier on which the frequency resource receiving the above-mentioned SCI is located, that is, sends the MAC PDU containing the SL CSI report MAC CE. When sending the SCI, the TX UE may record the correspondence between the SCI it sends and the carrier on which the SCI is sent. Thus, when receiving the SL CSI report, the TX UE can determine the carrier corresponding to the received SL CSI report based on the carrier on which the SL CSI report is received and the above-mentioned correspondence.

[0079] In another example, the carrier associated with the SL CSI report may be the carrier on which the frequency resources for the SL CSI measurement indicated by the SCI are located. The TX UE and the RX UE may agree that when the RX UE receives an SCI indicating that an SL CSI measurement is to be performed, the RX UE sends the SL CSI report on the carrier on which the frequency resources for the SL CSI measurement are located. Thus, upon receiving the SL CSI report, the TX UE can determine that the carrier to which the SL CSI report was received is the carrier to which it corresponds.

[0080] In this embodiment, the RX UE may be pre-configured with SL CSI RS configuration information, where the SL CSI RS configuration information includes a frequency resource for SL CSI measurement, and the carrier where the frequency resource for SL CSI measurement indicated by the SCI is located is determined based on the frequency resource. This example is specifically described in Example 1 provided below.

[0081] FIG2 is a flowchart illustrating an example of determining associated carriers in one embodiment of the present disclosure. In this example, the RX UE is pre-configured with multiple SL CSI RS configuration information, each of which includes a first configuration information identifier and carrier identifier information. The SCI triggering the SL CSI report includes a second configuration information identifier indicating the SL CSI RS configuration information corresponding to the SCI.

[0082] As shown in Figure 2, at S201, the RX UE selects a configuration information from multiple configuration information, wherein the first configuration information identifier is the same as the second configuration information identifier included in the SCI. Then, at S203, the RX UE determines the carrier associated with the SL CSI report based on the carrier identifier information in the selected configuration information. This example will be described in detail in Example 2 below.

[0083] FIG3 is a flowchart of a method for sending an SL SCI report performed by a user equipment according to another disclosed embodiment.

[0084] As shown in FIG3 , at S301 , the RX UE determines whether there is a triggered SL CSI report.

[0085] When there is a triggered SL CSI report, at S303 , the RX UE determines whether there are valid SL transmission resources.

[0086] When there are valid SL transmission resources, at S305 , the RX UE sends an SL CSI report to the TX UE that sends the SCI triggering the SL CSI report on the valid SL transmission resources, where the SL CSI report includes a given carrier identifier associated with the SL CSI report.

[0087] The given carrier identifier included in the SL CSI report may be agreed upon between the TX UE and the RX UE. The TX UE may determine the carrier to which the SL CSI report corresponds based on the agreement and the given carrier identifier in the SL CSI report.

[0088] In one example, the TX UE and the RX UE may agree that, when sending an SL SCI report, the RX UE uses the carrier identifier of the carrier on which the SCI is received as the given carrier identifier. In this case, when sending the SCI, the TX UE may record the correspondence between the sent SCI and the carrier on which the SCI is sent. Upon receiving the SL CSI report, the TX UE may determine the carrier to which the SL CSI report corresponds based on the correspondence and the carrier identifier in the SL CSI report.

[0089] In another example, the TX UE and the RX UE may agree that when the RX UE sends the SL SCI report, the carrier identifier of the carrier corresponding to the SL CSI measurement of the SL CSI report is used as the given carrier identifier. In this case, the TX UE can directly determine the carrier corresponding to the SL CSI report based on the given carrier identifier.

[0090] In another example, the TX UE and the RX UE may agree that when the RX UE sends the SL SCI report, the carrier identifier of the carrier associated with the SL CSI report indicated by the SCI is used as the given carrier identifier. In this case, since the carrier identifier of the carrier associated with the SL CSI report is specified by the TX UE, the TX UE can determine the carrier corresponding to the SL CSI report based on the carrier identifier specified by it. Here, the TX UE can specify any carrier identifier as the given carrier identifier, and determine the carrier corresponding to the SL CSI report based on its specified rule and the given carrier identifier.

[0091] The example shown in FIG3 will be described in detail in Example 3 below.

[0092] There may be multiple triggered SL CSI reports. For example, the RX UE may receive SCIs indicating SL SCI measurements on multiple carriers in the same time period, and multiple SL SCI reports may be triggered.

[0093] At this time, if the space of the SL transmission resource is insufficient to simultaneously send multiple SL CSI reports, the SL CSI report to be sent on the SL transmission resource can be determined based on a priority rule. The priority rule may include at least one of the following: a first priority rule, giving priority to transmitting on the SL transmission resource an SL CSI report whose corresponding carrier is the same as the carrier on which the SL transmission resource is located; a second priority rule, giving priority to the SL CSI report corresponding to the primary carrier over the SL CSI report corresponding to the secondary carrier; a third priority rule, when a timer is set for each of the multiple SL CSI reports, giving priority to sending the SL CSI report with a shorter remaining running time of the timer; a fourth priority rule, when a timer is set for each of the multiple SL CSI reports, giving priority to sending the SL CSI report with a longer remaining running time of the timer.

[0094] Here, "first", "second", "third" and "fourth" are only used to distinguish the priority rules, and are not used to limit the importance or priority of each priority. However, it can be set to make the first priority rule take precedence over other priority rules. That is, the SL CSI report corresponding to the carrier transmitted on the SL transmission resource is the same as the carrier where the SL transmission resource is located, which has the highest priority. In the case that there is still space left in the SL transmission resource, the SL CSI report to be sent on the SL transmission resource is further determined based on other priority rules. It can also be further set that the second priority rule takes precedence over the third priority rule and the fourth priority rule.

[0095] An example of applying the priority rule will be described in detail in the following embodiment 4.

[0096] The following specific examples are provided to illustrate the present disclosure.

[0097] Example 1

[0098] Step 1: The RX UE receives an SCI from the TX UE, in which the SL CSI request field is '1', instructing the RX UE to generate or report an SL CSI report. The RX UE triggers an SL CSI report based on the SCI and optionally starts a timer, sl-CSI-ReportTimer.

[0099] Preferably, the RX UE can determine the frequency resource or carrier resource (such as carrier identifier) ​​on which the SCI is received, that is, the RX UE can obtain on which carrier or frequency resource the SCI is received, thereby determining that the carrier or frequency resource is the carrier or frequency information associated with the SCI.

[0100] Step 2: When the RX UE receives the SCI in step 1, a SL CSI report is triggered, and preferably, the RX UE may consider the carrier associated with the triggered SL CSI report as the carrier associated with the SCI that triggered the SL CSI report.

[0101] On the RX UE side, when an SL CSI report is triggered and not canceled, the RX UE determines whether there are SL resources allocated for the first transmission or new transmission.

[0102] If the MAC entity of the RX UE has SL resources allocated for the first transmission or new transmission, the RX UE further determines whether the carrier or frequency associated with the SL resource is associated with or is the same as the carrier or frequency associated with the SCI that triggers the SL CSI report; or determines whether the carrier or frequency associated with the SL resource is associated with or is the same as the carrier or frequency associated with the triggered SL CSI report. The UE can determine whether the two are the same based on whether the carrier identifiers are the same.

[0103] For example, if the SL resource is located on carrier A and the SCI that triggers the SL CSI report is received on carrier A, then the SL resource can be considered to be associated with the SCI that triggers the SL CSI report, or to be associated with the same carrier;

[0104] For another example, if the SL resource is located on a carrier with a carrier identifier of X, and the SCI that triggers the SL CSI report is received on a carrier with a carrier identifier of X, then the SL resource can be considered to be associated with the SCI that triggers the SL CSI report, or to be associated with the same carrier;

[0105] For another example: the SL resource is located on carrier A, and the carrier associated with the SCI that triggers the SL CSI report is carrier A, then the carrier associated with the triggered SL CSI report is also carrier A, so it can be considered that the SL resource is associated with the triggered SL CSI report, or is associated with the same carrier;

[0106] For another example, if the frequency domain to which the SL resource belongs overlaps, coincides, or partially coincides with the frequency domain of the SCI receiving the SL CSI report triggering the SL CSI report, then the SL resource can be considered to be associated with the SCI triggering the SL CSI report.

[0107] When it is determined that the SL resource is associated with the SCI that triggers the SL CSI report, the RX UE instructs the generation of the SL CSI-report MAC CE in the multiplexing and assembly procedure. It can also cancel the triggered SL CSI report and stop the timer associated with the value.

[0108] As a supplement, if it is determined that the SL resource is not associated with the SCI that triggered the SL CSI report, the above-mentioned SL CSI-report MAC CE is not generated. For example, if the SL resource is located on carrier A, and the SCI that triggered the SL CSI report is received on carrier B, then it can be considered that the SL resource is not associated with the SCI that triggered the SL CSI report.

[0109] Step 3: Assemble the SL-CSI report MAC CE generated in step 2 into a MAC PDU for transmission / sending. Preferably, the MAC PDU including the SL-CSI report MAC CE is transmitted / sent on the SL resource.

[0110] Example 2

[0111] The difference from Example 1 is that, in step 1, in addition to setting the field value of SL CSI request to '1' to instruct the RX UE to generate or report the SL CSI report, the TX UE may further indicate the configuration information of the SL CSI RS in the SCI. For example, the pre-configured SL CSI RS configuration information may include one or more configuration information, each of which has its corresponding identifier or index, and each of which includes at least the following information:

[0112] -sl-CSI-RS-FirstSymbol indicates the first OFDM symbol on a PRB used for SL CSI-RS;

[0113] -sl-CSI-RS-FreqAllocation indicates the number of antenna ports and the frequency domain allocated to SL CSI-RS

[0114] Preferably, each piece of configuration information may further include a carrier identifier, or the carrier identifier may be included in the configuration information sl-CSI-RS-FreqAllocation.

[0115] In addition to indicating the SL CSI request, the SCI may also further indicate the configuration information identifier of the SL CSIRS. Based on the configuration information corresponding to the configuration information identifier, the RX UE can determine the transmission of the SL CSI RS and perform measurement and reporting.

[0116] Since the SL CSIRS configuration information provides carrier information, it can be considered that the carrier associated with the SCI is the carrier indicated in the SL CSI RS configuration information, and in Example 1, the carrier associated with the SCI is the frequency resource or carrier resource that receives the SCI. Then the implementation method of step 2 can be as follows:

[0117] Step 2: When the RX UE receives the SCI in step 1, it triggers an SL CSI report. Preferably, the RX UE considers the carrier associated with the triggered SL CSI report to be the carrier associated with the SCI that triggered the SL CSI report. On the RX UE side, when an SL CSI report is triggered and not canceled, the RX UE determines whether there are SL resources allocated for an initial transmission or a new transmission.

[0118] If the MAC entity of the RX UE has SL resources allocated to the first transmission or new transmission, the RX UE further determines whether the carrier associated with the SL resource is the same as the carrier associated with the SCI that triggers the SL CSI report, where the carrier associated with the SL resource is the carrier where the SL resource is located; or further determines whether the carrier associated with the SL resource is the same as the carrier of the SL CSI RS for measurement (that is, the carrier indicated or included in the configuration information corresponding to the SL CSI RS configuration information identifier indicated in the SCI that triggers the SL CSI report):

[0119] For example, if the SL resource is located on carrier A, and the carrier included in the SL CSI RS configuration information indicated in the SCI that triggers the SL CSI report is also carrier A, then the SL resource can be considered to be associated with the SCI that triggers the SL CSI report, or to be associated with the same carrier;

[0120] For another example: the SL resource is located on carrier A, and the carrier indicated or included in the configuration information corresponding to the SL CSI RS configuration information identifier indicated in the SCI that triggers the SL CSI report is carrier A, then the carrier associated with the triggered SL CSI report is also carrier A, so it can be considered that the SL resource is associated with the triggered SL CSI report, or is associated with the same carrier;

[0121] When it is determined that the SL resource is associated with the SCI that triggers the SL CSI report, the RX UE instructs the generation of the SL CSI-report MAC CE in the multiplexing and assembly procedure. It can also cancel the triggered SL CSI report and stop the timer associated with the value.

[0122] As a supplement, if it is determined that the SL resource is not associated with the SCI that triggers the SL CSI report, or if the SL resource is not associated with the triggered SL CSI report, the above-mentioned SL CSI-report MAC CE is not generated. For example, if the SL resource is located on carrier A, and the configuration information of the SL CSI RS indicated by the SCI that triggers the SL CSI report includes the identification information of carrier B, then it can be considered that the SL resource is not associated with the SCI that triggers the SL CSI report.

[0123] In step 3, the UE may further assemble the SL-CSI report MAC CE generated in step 2 into a MAC PDU for transmission / sending.

[0124] Another implementation of this embodiment may be:

[0125] In step 1, the TX UE may further indicate the SL CSI RS configuration information identifier in addition to the SL CSI request in the SCI. Based on the configuration information corresponding to the configuration information identifier, the RX UE may determine the transmission of the SL CSI RS and perform measurement and reporting.

[0126] In step 2, on the RX UE side, when the RX UE receives the SCI in step 1 to trigger a SL CSI report, and preferably, the RX UE considers that the carrier associated with the SL CSI report is the carrier of the SL CSI RS to be measured, that is, the carrier indicated or included in the configuration information corresponding to the SL CSI RS configuration information identifier indicated in the SCI that triggers the SL CSI report.

[0127] When an SL CSI report is triggered and not canceled, the RX UE determines whether there are SL resources allocated for the first transmission or new transmission. If the MAC entity of the RX UE has SL resources allocated for the first transmission or new transmission, the RX UE further determines whether the carrier associated with the SL resource is the same as the carrier associated with the SL CSI report:

[0128] When it is determined that the carrier on which the SL resource is located is the same as, associated with, or corresponds to the carrier on which the SL CSI report is triggered, the SL resource can be considered to be associated with the triggered SL CSI report. The RX UE then instructs the generation of the SL CSI-report MAC CE in the multiplexing and assembly procedure. The triggered SL CSI report can also be canceled and the timer associated with the value can be stopped.

[0129] As a supplement, if it is determined that the carrier on which the SL resource is located is different from, or is not associated with, or does not correspond to the carrier associated with the triggered SL CSI report, it can be considered that the SL resource and the triggered SL CSI report are not associated, and the above-mentioned SL CSI-report MAC CE is not generated. For example, the SL resource is located on carrier A, and the configuration information of the SL CSI RS indicated by the SCI that triggers the SL CSI report includes the identification information of carrier B, that is, the carrier associated with the triggered SL CSI report is carrier B, then it can be considered that the carrier located is not associated with the carrier associated with the triggered SL CSI report.

[0130] In step 3, the UE may further assemble the SL-CSI report MAC CE generated in step 2 into a MAC PDU for transmission / sending.

[0131] Example 3

[0132] The aforementioned embodiment provides a method for enabling the TX UE to identify the carrier information associated with the SL CSI report without expanding the SL-CSI report MAC CE space.

[0133] When the SL-CSI report MAC CE space is not limited, the RX UE may indicate the carrier identification information in the SL-CSI report MAC CE. The specific implementation may be:

[0134] Step 1: The RX UE receives an SCI from the TX UE, in which the CSI request field is '1', instructing the RX UE to generate an SL CSI report. The RX UE triggers an SL CSI report based on the SCI and optionally starts a timer, sl-CSI-ReportTimer.

[0135] Preferably, the RX UE can determine the frequency resource or carrier resource on which the SCI is received, that is, the RX UE can obtain on which carrier or frequency resource the SCI is received, thereby determining the carrier or frequency information associated with the SCI.

[0136] Step 2: On the RX UE side, when an SL CSI report is triggered and not canceled, the RX UE determines whether there are SL resources allocated for the first transmission or new transmission.

[0137] If the RX UE's MAC entity has SL resources allocated for initial or new transmission, the RX UE instructs the generation of an SL CSI-report MAC CE in the multiplexing and assembly procedure. It can also cancel the triggered SL CSI report and stop the timer associated with the value.

[0138] The generated SL CSI reportMAC CE also indicates the carrier information or frequency information determined in step 1 in the aforementioned embodiment, and preferably, is carried in the carrier identification information.

[0139] Step 3: Assemble the SL-CSI report MAC CE generated in step 2 into a MAC PDU for transmission / sending.

[0140] Specific implementation methods may also be:

[0141] In step 1, in addition to setting the field value of SL CSI request to '1' to indicate the request for SL CSI report, the TX UE may further indicate the configuration information of SL CSI RS. For example, the pre-configured SL CSI RS configuration information may include one or more configuration information, each of which has its corresponding identifier or index, and each configuration information includes at least the following information:

[0142] -sl-CSI-RS-FirstSymbol indicates the first OFDM symbol on a PRB used for SL CSI-RS;

[0143] -sl-CSI-RS-FreqAllocation indicates the number of antenna ports and the frequency domain allocated to SL CSI-RS

[0144] Preferably, each piece of configuration information may further include a carrier identifier, or the carrier identifier may be included in the configuration information sl-CSI-RS-FreqAllocation.

[0145] Then, in addition to indicating the SL CSI request, the SCI may further indicate the configuration information identifier of the SL CSI RS. According to the configuration information corresponding to the configuration information identifier, the RX UE may determine the transmission of the SL CSI RS, and thus perform measurement and reporting.

[0146] Step 2: On the RX UE side, when an SL CSI report is triggered and not canceled, the RX UE determines whether there are SL resources allocated for the first transmission or new transmission.

[0147] If the RX UE's MAC entity has SL resources allocated for initial or new transmission, the RX UE instructs the generation of an SL CSI-report MAC CE in the multiplexing and assembly procedure. It can also cancel the triggered SL CSI report and stop the timer associated with the value.

[0148] The generated SL CSI report MAC CE also indicates the carrier information contained in the SL CSI RS configuration information indicated in the SCI that triggers the SL CSI report, such as a carrier identifier. Preferably, such a carrier identifier is indicated in the generated SL-CSI report MAC CE.

[0149] Step 3: Assemble the SL-CSI report MAC CE generated in step 2 into a MAC PDU for transmission / sending.

[0150] Example 4

[0151] Based on the above embodiment, if the SL resource used for new transmission in step 2 cannot accommodate multiple SL CSI reports simultaneously, the multiple SL CSI reports here correspond to different carriers, and these SL CSI reports can correspond to multiple SL-CSI report MAC CEs or a single SL-CSI report MAC CE. Therefore, how to determine which carriers' SL CSI reports can use the current SL resources, and which carriers' SL CSI reports need to wait for the next SL resources, is a problem that needs to be solved. In other words, which carrier or carriers' SL CSI reports on the SL resources can be reported preferentially by the current SL resources.

[0152] In one case, the SL CSI report to be transmitted first is determined based on the carrier associated with the SL resource used for new transmission. For example, the carrier associated with the SL resource currently used for new transmission is carrier A, that is, the SL resource is located on carrier A. Among the one or several SL CSI reports to be transmitted or triggered, at least one SL CSI report is associated with a carrier that is also carrier A, then the SL CSI report can be transmitted first in this SL resource, that is, space is reserved in the SL resource for the SL CSI report of carrier A. Then, if there is no remaining space, the remaining SL CSI report will be transmitted in the SL resource at the next moment. If there is still remaining space and it can accommodate at least one SL CSI report, then the selection can continue according to other principles. Among them, the carrier associated with the SL CSI report can be the carrier associated with the SCI that triggers the SL CSI report, or it can be the carrier where the measurement signal SL CSI RS corresponding to the SL CSI report is located. The method for determining these carriers is as described in the above embodiment.

[0153] In another case, the determination can also be made based on carrier priority. For example, if the carriers configured for the UE include a primary carrier and a secondary carrier, then when one of the multiple SL CSI reports is associated with a primary carrier, the SL CSI report corresponding to the primary carrier is always prioritized for generating and transmitting the SL CSI report.

[0154] In another case, the preferred SL CSI report is determined based on the running status of the sl-CSI-ReportTimer. As shown above, when an SL CSI report is triggered, the UE can start the sl-CSI-ReportTimer. When the sl-CSI-ReportTimer times out, the UE can cancel the corresponding triggered SL CSI report. Then, based on the running status of the sl-CSI-ReportTimer, the following can be selected:

[0155] Assume that the remaining time of the sl-CSI-ReportTimer corresponding to the SL CSI report of carrier A is X, and the remaining time of the sl-CSI-ReportTimer corresponding to the SL CSI report of carrier B is Y, and X < Y. Then, the SL CSI report with less remaining time is preferentially selected to generate the corresponding SL CSI report MAC CE, that is, the SL CSI report of carrier A is preferentially selected; here, the remaining time is equal to the total duration of the timer minus the elapsed duration.

[0156] Or assume that the elapsed duration of the sl-CSI-ReportTimer corresponding to the SL CSI report of carrier A is M, and the elapsed duration of the sl-CSI-ReportTimer corresponding to the SL CSI report of carrier B is N, and M > N. Then, the SL CSI report with a longer elapsed time is preferentially selected to generate the corresponding SL CSI report MAC CE, that is, the SL CSI report of carrier A.

[0157] Here, it is assumed that the sl-CSI-ReportTimer starts counting from 0 until it reaches the maximum running time, that is, the pre-configured total duration of the timer, and then it is considered to have run out of time.

[0158] Two or three of the above principles can be combined and used.

[0159] For example, in the case of multiple SL CSI reports, if the SL resources cannot accommodate all the SL CSI reports, the SL CSI report associated with the primary carrier can be selected first. Then, if there is still remaining space, the SL CSI report associated with the carrier associated with the SL resources can be continued to be selected; if there is still remaining space, it can be selected according to the running status of the timer.

[0160] Or in the case of multiple SL CSI reports, if the SL resources cannot accommodate all the SL CSI reports, the SL CSI report associated with the carrier associated with the SL resources can be selected first; if there is still remaining space, it can be selected according to the running status of the timer.

[0161] After selecting the corresponding one or more SL CSI reports, the RX UE instructs the generation of a corresponding SL CSI-report MAC CE containing the selected SL CSI report or reports in the multiplexing and assembly procedure, or generates an SL CSI-report MAC CE containing all the selected SL CSI reports. The corresponding triggered SL CSI report can also be canceled and the timer associated with it can be stopped. Preferably, the SL CSI-report MAC CE also indicates the corresponding carrier information that triggers the SL CSI report, and the method for determining the carrier information is as shown in the above embodiment.

[0162] The UE then assembles the SL-CSI report MAC CE generated in step 2 into a MAC PDU for transmission / sending.

[0163] FIG4 is a block diagram illustrating a user device 400 according to an embodiment of the present disclosure. As shown in FIG4 , the user device 400 includes a processor 401 and a memory 402. The processor 401 may include, for example, a microprocessor, a microcontroller, an embedded processor, etc. The memory 402 may include, for example, a volatile memory (such as a random access memory RAM), a hard disk drive (HDD), a non-volatile memory (such as a flash memory), or other memory. The memory 402 stores program instructions. When the instructions are executed by the processor 401, the above-mentioned method performed by the user device (such as the method shown in FIG1 to 3 ) described in detail in the present disclosure may be executed.

[0164] The program running on the device according to the present disclosure may be a program that controls a central processing unit (CPU) to enable a computer to implement the functions of the embodiments of the present disclosure. The program or the information processed by the program may be temporarily stored in a volatile memory (such as a random access memory RAM), a hard disk drive (HDD), a non-volatile memory (such as a flash memory), or other memory systems.

[0165] The program for realizing each embodiment function of the present disclosure can be recorded on a computer-readable recording medium. The corresponding function can be realized by making a computer system read the program recorded on the recording medium and executing these programs. The so-called "computer system" herein can be a computer system embedded in the device, and can include an operating system or hardware (such as a peripheral device). "Computer-readable recording medium" can be a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a short-term dynamic storage program recording medium or any other recording medium that is computer-readable.

[0166] The various features or functional modules of the devices used in the above embodiments can be implemented or executed by circuits (e.g., single-chip or multi-chip integrated circuits). The circuits designed to perform the functions described in this specification may include a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic, discrete hardware components, or any combination of the above devices. The general-purpose processor may be a microprocessor, or any existing processor, controller, microcontroller, or state machine. The above circuits may be digital circuits or analog circuits. In the case where new integrated circuit technologies have emerged to replace existing integrated circuits due to advances in semiconductor technology, one or more embodiments of the present disclosure may also be implemented using these new integrated circuit technologies.

[0167] Furthermore, the present disclosure is not limited to the above-described embodiments. Although various examples of the embodiments have been described, the present disclosure is not limited thereto. Fixed or non-mobile electronic devices installed indoors or outdoors can be used as UE devices or communication devices, such as AV equipment, kitchen equipment, cleaning equipment, air conditioners, office equipment, vending machines, and other household appliances.

[0168] As described above, the embodiments of the present disclosure have been described in detail with reference to the accompanying drawings. However, the specific structure is not limited to the above-mentioned embodiments, and the present disclosure also includes any design changes that do not deviate from the main purpose of the present disclosure. In addition, various modifications can be made to the present disclosure within the scope of the claims, and embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present disclosure. In addition, components with the same effect described in the above-mentioned embodiments can be replaced with each other.

Claims

1. A method for sending a SL SCI report performed by a user equipment, comprising: receiving an SCI from another user equipment on a first carrier, the SCI carrying a domain value for requesting an SL CSI report, Trigger an SL CSI report; determining whether there are SL resources for new transmission on the carrier receiving the SCI; and When there are SL resources for new transmission on the first carrier, it is indicated to generate a SL CSI report MAC CE in the multiplexing and combining process, cancel the triggered SL CSI report, and send a MAC PDU containing the SL CSI report MAC CE on the SL resources to the sending user equipment that sends the SCI.

2. A user equipment, comprising: processor; as well as A memory, wherein instructions are stored in the memory; Wherein, when the instructions are executed by the processor, the user equipment is caused to perform the method according to claim 1.

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