Method performed by a user equipment and the user equipment

Abstract

The present invention provides a method executed by a user equipment and the user equipment. The method executed by the user equipment is a method for determining the CSI report belonging to or the corresponding address information executed by the user equipment, and the method includes the following steps: A user equipment carries a CSI request trigger in the SCI, and schedules the transmission of a PSSCH carrying a TB in the SCI, where the TB contains a MAC PDU, and the MAC sub-header of the MAC PDU contains address information; Another user equipment receives the above SCI, receives the transmission of the PSSCH according to the information in the SCI, and decodes the TB; Another user equipment generates a CSI report, and the address information of the CSI report is determined by the address information of its corresponding CSI request trigger.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technologies, and more particularly, to a method performed by a user equipment and a corresponding user equipment. Background Art

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

[0003] In a pair of UEs performing V2X service communication, such as UE A and UE B, in order to obtain link quality information, UE A may request UE B to report CSI. Based on this CSI request, UE B will generate a corresponding CSI report and send the CSI report to UE A. The CSI report may also be carried in a MAC CE, which may be referred to as a CSI report MAC CE. Then, this MAC CE is encapsulated into a MAC PDU and transmitted through the PSSCH channel.

[0004] When encapsulating a MAC PDU containing a CSI report MAC CE, the UE (UE B) that sends the CSI report needs to clearly know the address information of this MAC PDU and carry the address in the sub-header of the MAC PDU, including the source address and the destination address. Then, how the UE determines the address information to which a CSI report belongs is a problem that needs to be solved.

[0005] In addition, the CSI report is time-sensitive. When the UE (UE A) that initiates the CSI request receives a CSI report, how to determine whether it is valid is also a problem that needs to be solved. Summary of the Invention

[0006] The object of the present invention is to propose a solution to the problem of how a UE determines the address information to which a CSI report belongs and the problem of the time sensitivity of the CSI report.

[0007] According to one aspect of the present invention, there is provided a method executed by a user equipment, which is a method for determining the address information to which the channel state information report CSI report belongs or the corresponding address information executed by the user equipment UE. The method includes the following steps: A user equipment UE A carries a CSI request trigger CSI requesttrigger in the sidelink control information SCI and schedules the transmission of a physical sidelink shared channel PSSCH carrying a transport block TB in the SCI. The TB contains a media access control protocol data unit MAC PDU, and the MAC subheader of the MAC PDU contains address information. Another user equipment UE B receives the above SCI, receives the transmission of the PSSCH according to the information in the SCI, and decodes the TB. UE B generates a CSI report, and the address information of the CSI report is determined by the address information of its corresponding CSI requesttrigger.

[0008] In the above method executed by the user equipment, preferably, if the TB is successfully decoded, UE B further determines the address information and then associates the address information with the CSI report trigger carried in the SCI, thereby determining the address information to which the CSI report trigger belongs or the corresponding address information. If the TB is not successfully decoded, UE B cannot determine the address information, thereby determining that the CSI request trigger is an invalid CSI report trigger or canceling the CSI report trigger.

[0009] In the above method executed by the user equipment, preferably, when there is a corresponding CSI requesttrigger for the TB, if the TB decoding fails, the CSI request trigger is canceled. If the TB decoding is successful, it is determined that the CSI request trigger is valid, and the address information associated / bound with the CSI request trigger is further determined based on the address information in the MAC PDU carried by the TB.

[0010] In the method executed by the user equipment as described above, preferably, when it is determined that there is at least one valid CSI request trigger or a CSI request trigger that has not been cancelled, and when the MAC entity of the UE obtains a sidelink resource for the first transmission or a new transmission and the address of the resource available for transmission is the same as or corresponds to the address bound to or corresponding to the CSI request trigger, information on the CSI report corresponding to the CSI request trigger is obtained from the lower layer, and the Multiplexing and Assembly entity is instructed to generate a CSI report MAC control element (CSI report MAC CE).

[0011] According to another aspect of the present invention, there is provided a method executed by a user equipment, which is a method for determining the address information to which the channel state information report (CSI report) belongs or corresponds, executed by the user equipment (UE). The method includes the following steps: A user equipment UE A carries a CSI request trigger in the sidelink control information (SCI), and further carries a layer 1 ID in the SCI, where the layer 1 ID is configured by radio resource control (RRC) signaling or calculated based on the layer 2 ID; another user equipment UE B generates a CSI report corresponding to the CSI request trigger, and indicates / transmits the CSI report and the layer 1 ID and / or layer 2 ID carried in the SCI to the upper layer; the address information of the CSI report is determined based on the indicated layer 1 ID or layer 2 ID.

[0012] In the method executed by the user equipment as described above, preferably, after the address information corresponding to the CSI report is determined, when the UE generates a CSI report and indicates / transmits it to the upper layer, the address information corresponding to the CSI report is indicated at the same time; when the upper layer receives the CSI report indicated by the lower layer, it instructs the Multiplexing and Assembly entity to generate a CSI report MAC CE.

[0013] In the method executed by the user equipment as described above, preferably, when the UE obtains a sidelink / vehicle-to-everything (V2X) resource, it first determines the address that can use the resource for transmission.

[0014] In the above method executed by the user equipment, preferably, when the UE obtains sidelink / V2X resources, if the UE needs to send a CSI report or a CSI report MAC CE to a certain address, or there is a valid or uncanceled CSI report trigger, and the corresponding address is the same as or corresponds to this address, then this address is used as the candidate address for this resource.

[0015] In the above method executed by the user equipment, preferably, if the UE also needs to send service data to a certain address, and these service data respectively belong to one or more logical channels, and each logical channel has its corresponding logical channel priority, then the highest priority among them is selected as the priority corresponding to this address.

[0016] According to another aspect of the present invention, there is provided a user equipment, including: a processor; and a memory, where instructions are stored on the memory, and when the instructions are run by the processor, the user equipment executes the method described above.

[0017] According to the method executed by the user equipment and the corresponding user equipment involved in the present disclosure, it is not only possible to determine the address information to which a CSI report belongs, but also possible to take into account the timeliness of the CSI report. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a flowchart showing a method for determining the address information to which a CSI report belongs or corresponds, which is executed by a user equipment UE according to an embodiment of the present invention.

[0019] Figure 2 It is a flowchart showing a method for determining the address information to which a CSI report belongs or corresponds, which is executed by a user equipment UE according to another embodiment of the present invention.

[0020] Figure 3 It is a schematic block diagram of a user equipment UE according to the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the present invention should not be limited to the specific embodiments described below. In addition, for the sake of simplicity, the detailed description of the well-known technologies that have no direct association with the present invention is omitted to prevent confusion in the understanding of the present invention.

[0022] Before the specific description, the following explanations are made for several terms mentioned in the present invention. Unless otherwise specified, the terms involved in the present invention have the following meanings.

[0023] UE User Equipment User Equipment

[0024] NR New Radio New Radio

[0025] Sidelink Sidelink

[0026] V2X Vechile to Everything Vehicle-to-Everything

[0027] MAC Medium Access Control Medium Access Control

[0028] MAC CE MAC control element MAC control element

[0029] LCID Logical Channle Identity Logical Channel Identity

[0030] PDU Protocol Data Unit Protocol Data Unit

[0031] SDU Service Data Unit Service Data Unit

[0032] PSSCH Physical Sidelink Shared Channel Physical Sidelink Shared Channel

[0033] PSFCH Physical Sidelink Feedback Channel Physical Sidelink Feedback Channel

[0034] SCI Sidelink Control Information Sidelink Control Information

[0035] PSCCH Physical Sidelink Control Channel Physical Sidelink Control Channel

[0036] Qos Quality of Service Quality of Service

[0037] SL-SCHSidelink Shared Channel Sidelink Shared Channel

[0038] CSI Channel State Information Channel State Information

[0039] CSI RS CSI reference signalling CSI reference signalling

[0040] RRC Radio Resource Control Radio Resource Control

[0041] HARQ Hybrid Automatic Repeat Request Hybrid Automatic Repeat Request

[0042] ID Identity Identity

[0043] In this article, related, corresponding, and equivalent terms can be used interchangeably.

[0044] In this article, the terms "sidelink" and "V2X" can be used interchangeably.

[0045] In this article, there is at least one pair of UEs: UE A and UE B. Among them, UE A initiates a CSI request, that is, UE A transmits information to UE B, requesting UE B to send a CSI report to UE A. This request information can be called a CSI request trigger and is usually carried in the SCI.

[0046] UE B that receives the CSI request trigger measures the CSI-RS transmitted by UE A to obtain / generate a CSI report, and then UE B sends the CSI report to UE A. This CSI report can be considered corresponding to the CSI request trigger, or it can be said that this CSI report is triggered and generated by the corresponding CSI request trigger.

[0047] UE A receives the CSI report sent by UE B to determine the link status or link quality between UE A and UE B.

[0048] Therefore, based on the roles of UE A and UE B, it can be known that UE A is the UE that initiates the CSI request and the UE that receives the CSI report; UE B is the UE that receives the CSI request and the UE that sends the CSI report.

[0049] The address information described below may be a pair of Layer-2 IDs (Layer-2 Identity, which can be abbreviated as Layer-2 ID or L2ID) used to determine the communication connection between UE A and UE B, and may include a source Layer-2 ID and a destination Layer-2 ID.

[0050] For example, when UE A sends data or information to UE B, the address to which the sent data or information is sent is a pair of Layer-2 IDs with {source address ID-A and destination address ID-B}.

[0051] Correspondingly, if UE B sends data or information to UE A, the address to which the sent data or information is sent is a pair of Layer-2 IDs with {source address ID-B’ and destination address ID-A’}.

[0052] In an ideal case, ID-B’ = ID-B and ID-A’ = ID-A, that is, the source address and the destination address are exchanged. When UE A sends data as the source, the source address is the ID corresponding to UE A, that is, ID-A. When UE B receives data as the destination, the destination address is the ID corresponding to UE B, that is, ID-B. In this case, by exchanging the source address and the destination address, it is easy to obtain that when UE B sends data as the source, the source address is the ID corresponding to UE B, that is, ID-B, and when UE A receives data as the destination, the destination address is the ID corresponding to UE A, that is, ID-A.

[0053] In addition, there is also a case where ID-B’ is not equal to ID-B and ID-A’ is not equal to ID-A. That is, a pair of Layer-2 IDs with {source address ID-A and destination address ID-B} identifies a wireless link with UE A as the sender and UE B as the receiver; while a pair of Layer-2 IDs with {source address ID-B’ and destination address ID-A’} identifies another wireless link with UE A as the sender and UE B as the receiver. Here, it can be considered that the address information {source address ID-A and destination address ID-B} has a corresponding relationship with another set of address information {source address ID-B’ and destination address ID-A’}. When UE A sends data to UE B according to the address with {source address ID-A and destination address ID-B}, UE A can determine that the corresponding address {source address ID-B’ and destination address ID-A’} is the address for UE A to receive data from UE B.

[0054] Regardless of the above situation, UE A and UE B can clarify the following information:

[0055] When UE A needs to send information to UE B, the layer 2 ID carried by UE A in the MAC PDU is {source address: ID-A, destination address: ID-B};

[0056] When UE A needs to receive information from UE B, UE A receives those MAC PDUs carrying the layer 2 ID {source address: ID-B’, destination address: ID-A’};

[0057] When UE B needs to send information to UE A, the layer 2 ID carried by UE B in the MAC PDU is {source address: ID-B’, destination address: ID-A’};

[0058] When UE B needs to receive information from UE A, UE B receives those MAC PDUs carrying the layer 2 ID {source address: ID-A, destination address: ID-B};

[0059] It can be considered that the two sets of address information of the layer 2 ID {source address: ID-A, destination address: ID-B} and {source address: ID-B’, destination address: ID-A’} are both layer 2 ID / address information that UE A or UE B is interested in.

[0060] In addition, the MAC PDU may include a MAC header, as well as a MAC SDU and / or MAC CE, etc. The MAC header contains several MAC subheaders, and one of the MAC subheaders is the SL-SCH subheader. Usually, this SL-SCH subheader contains address information, including the source address and the destination address. Therefore, the MAC subheader containing address information mentioned below mainly refers to this SL-SCH subheader. Of course, the address information can also be carried in other MAC subheaders, which does not affect the implementation of the solution.

[0061] Hereinafter, several embodiments of the present invention will be described in detail.

[0062] Embodiment 1

[0063] This embodiment provides a method for determining the address information to which a CSI report belongs or corresponds, which is executed by a user equipment UE.

[0064] In order to determine the address information to which a CSI report belongs or corresponds, one method is to determine it according to the CSI request trigger that triggers the CSI report. As Figure 1 shown, specifically, it can be:

[0065] Step S101: UE A carries a CSI request trigger in the SCI and schedules the transmission of the PSSCH in this SCI, that is, the SCI contains time and frequency domain information for receiving the PSSCH transmission, etc. A transport block (TB) is carried on this PSSCH, and this TB contains a MAC PDU. The MAC sub-header in this MAC PDU contains address information, including the destination address and source address of this MAC PDU. Therefore, it can be considered that this address information corresponds to the CSI request trigger.

[0066] Step S102: UE B receives the SCI in Step S101, receives the transmission of the PSSCH according to the information in the SCI, and decodes this TB.

[0067] - If the decoding of this TB is successful, that is, UE B obtains the MAC PDU carried by this TB through decoding, then UE B can obtain the address information carried by the MAC sub-header in the MAC PDU, that is, the address information described in Step S101, and then associates this address information with the CSI report trigger carried in this SCI. Through this operation, the address information to which a CSI report trigger belongs or corresponds can be determined. And optionally, a CSI report trigger with corresponding address information can be considered a valid CSI report trigger, or a pending CSI report trigger, or a not cancelled CSI report trigger.

[0068] - If the decoding of this TB is not successful, or decoding fails, that is, UE B cannot obtain the MAC PDU carried by this TB through decoding, then UE B cannot determine the address information described in Step S101. Then, for this CSI request trigger, UE B can determine it as an invalid CSI report trigger, or cancel this CSI report trigger.

[0069] The above operations can be completed at the MAC layer of UE B. Since the CSI request trigger is carried in the SCI, when the physical layer receives the SCI, it can indicate the CSI request trigger to the upper layer (e.g., the MAC layer); after receiving this indication from the lower layer (e.g., the physical layer), the upper layer (e.g., the MAC layer) can perform the operation of step S102 when decoding its corresponding TB. The so-called corresponding TB here is the TB transmitted on the PSSCH scheduled by the SCI carrying the CSI request trigger as described in step S101.

[0070] Therefore, another implementation manner of step S102 can be

[0071] When UE B decodes the received TB, if this TB has a corresponding CSI request trigger, then

[0072] If the decoding of this TB fails, UE cancels this CSI request trigger.

[0073] If the decoding of this TB is successful, UE can determine that this CSI request trigger is valid, and can also determine the address information associated / bound with this CSI request trigger based on the address information in the MAC PDU carried by this TB.

[0074] The specific determination method can be to use the address information in the MAC PDU carried by this TB as the address information associated / bound with this CSI request trigger.

[0075] It can also be that when the address information in the MAC PDU carried by this TB includes a destination address and a source address, from the perspective of UE A, if this destination address is ID-B and the source address is ID-A; then from the perspective of UE B, this destination address is ID-A and the source address is ID-B, that is, the destination address and the source address are swapped. Then, the destination address in the MAC PDU carried by this TB can be used as the source address associated / bound with this CSI request trigger, and the source address in the MAC PDU carried by this TB can be used as the destination address associated / bound with this CSI request trigger, so as to determine the address information associated / bound with this CSI trigger.

[0076] Alternatively, determine the address corresponding to the data sent from UE B to UE A according to the address information in the MAC PDU carried by the TB, and use this address information as the address information associated / bound with the CSI request trigger.

[0077] Step S103: UE B generates a CSI report, and the address information of the CSI report is determined by the address information of its corresponding CSI request trigger.

[0078] The specific determination method can be to make the address information of the CSI report the same as the address information of its corresponding CSI request trigger.

[0079] Alternatively, determine the address corresponding to the CSI report sent from UE B to UE A according to the address information of the CSI request trigger.

[0080] It can be to use the target address in the address information of the CSI request trigger as the source address of the CSI report, and use the source address in the address information of the CSI request trigger as the target address of the CSI report.

[0081] Alternatively, determine its corresponding address information according to the address information of the CSI request trigger, and use this address information as the address information of the CSI report. This correspondence means that: the address information of the CSI request trigger is the address information for the data or CSI request trigger sent from UE A to UE B, and for UE B to receive the data or CSI request trigger sent from UE A; while the address information of the CSI report is the address information for UE A to receive the data or CSI report sent from UE B, and for UE B to send the data or CSI report to UE A.

[0082] Embodiment 2

[0083] This embodiment provides another method for determining the address information to which the CSI report executed by the user equipment UE belongs or corresponds.

[0084] To determine the address information to which a CSI report belongs or corresponds, it can also be determined through its associated layer 1 ID. As Figure 2 shown, specifically, it can be:

[0085] Step S201: UE A carries a CSI request trigger in the SCI, and also carries a layer 1 ID in this SCI.

[0086] The layer 1 ID can be configured through RRC signaling or calculated based on the layer 2 ID. Specifically, if the source address in the layer 2 ID has 24 bits and the destination address has 24 bits, then UE can generate a layer 1 ID, where the source address has 8 bits and the destination address has 16 bits. The source address of the layer 1 ID can be the 8-bit interception of the 24-bit source address in the layer 2 ID, such as the high / low 8-bit value of the 24 bits, and the destination address in the layer 1 ID can be the 16-bit interception of the 24-bit destination address in the layer 2 ID, such as the high / low 16-bit value of the 24 bits.

[0087] It should be noted that the above method of generating the layer 1 ID based on the layer 2 ID can be implemented in the physical layer or in the upper layer of the physical layer, such as the MAC layer. The difference lies in:

[0088] If the layer 1 ID is generated in the physical layer, then a possible method is that the physical layer can restore / remap the layer 1 ID into the layer 2 ID; if the layer 1 ID is generated in the upper layer of the physical layer and indicated to the physical layer, then the physical layer cannot perform the restore / remap process.

[0089] Step S202: UE B generates a CSI report corresponding to this CSI request trigger, and indicates / transmits the CSI report and the layer 1 ID carried in the SCI to the upper layer, such as the MAC layer.

[0090] Since the CSI report is generated by the CSI request trigger, and the CSI request trigger is associated with the layer 1 ID also carried in the SCI, UE can identify the generated CSI report and its corresponding layer 1 ID in the physical layer and indicate it to the upper layer.

[0091] As described in Step S201, when the physical layer cannot perform the restore process of remapping, the layer 1 ID can be directly indicated to the upper layer (such as the MAC layer), and the upper layer performs the restore process to restore the layer 1 ID into the layer 2 ID, so as to obtain the layer 2 ID that can determine the CSI report address information.

[0092] Another implementation of the above step S202 may also be that UE B generates a CSI report corresponding to the CSI request trigger, and indicates / transmits the layer 2 ID corresponding to the layer 1 ID carried in the CSI report and the SCI to the upper layer, such as the MAC layer.

[0093] In this implementation, it is considered that the physical layer can restore the layer 1 ID to the layer 2 ID. Therefore, the layer 2 ID can be directly indicated to the upper layer.

[0094] Step S203: Determine the address information of the CSI report based on the indicated layer 1 ID or layer 2 ID.

[0095] If the indicated is the layer 1 ID, it needs to be first restored / remapped to the corresponding layer 2 ID. Here, both the directly indicated layer 2 ID and the layer 2 ID remapped based on the indicated layer 1 ID are collectively referred to as the indicated layer 2 ID. Then UE can determine the address information of the CSI report based on the indicated layer 2 ID.

[0096] The method described in step S103 of Embodiment 1 can be used to determine the address information of the CSI report according to the indicated layer 2 ID.

[0097] For example, set the address information of the CSI report to be the same as the address information of the indicated layer 2 ID.

[0098] For another example, use the target address in the address information of the indicated layer 2 ID as the source address of the CSI report, and use the source address in the address information of the indicated layer 2 ID as the target address of the CSI report.

[0099] For another example, determine its corresponding address information according to the address information of the indicated layer 2 ID, and use this address information as the address information of the CSI report. This correspondence means that: the address information of the indicated layer 2 ID is the layer 2 ID for UE A to send data or CSI request trigger to UE B, and for UE B to receive data or CSI request trigger sent by UE A; while the address information of the CSI report is the layer 2 ID for UE A to receive data or CSI report sent by UE B, and for UE B to send data or CSI report to UE A.

[0100] If the UE can determine the layer 1 ID corresponding to the CSI report based on the layer 1 ID corresponding to the CSI report trigger, then it can be that the UE first determines the layer 1 ID corresponding to the CSI report in step S202 and then indicates the layer 1 ID or the remapped layer 2 ID to the upper layer in step S203. The upper layer uses the indicated layer 2 ID as the address information of the CSI report. Among them, determining the layer 1 ID corresponding to the CSI report based on the layer 1 ID corresponding to the CSI report trigger is the same as the above-mentioned method of determining the layer 2 ID corresponding to the CSI report based on the indicated layer 2 ID. It can be to use the target address in the layer 1 ID corresponding to the CSI report trigger as the source address of the CSI report layer 1 ID, and use the source address of the layer 1 ID corresponding to the CSI report trigger as the target address of the CSI report layer 1 ID. Or it is to determine the corresponding layer 1 ID based on the layer 1 ID corresponding to the CSI report trigger and use this layer 1 ID as the layer 1 ID of the CSI report. This correspondence means that the layer 1 ID corresponding to the CSI report trigger is the layer 1 ID used for the data or CSI request trigger sent by UE A to UE B, and for UE B to receive the data or CSI request trigger sent by UE A; and its corresponding layer 1 ID is the layer 1 ID used for UE A to receive the data or CSI report sent by UE B, and for UE B to send the data or CSI report to UE A.

[0101] The problem solved by the above embodiments is to determine the address information of the CSI report or the CSI report MAC CE. Next, the generation of the CSI report MAC CE can be solved.

[0102] Embodiment 3

[0103] Embodiment 3 can be combined with steps S101 and S102 in Embodiment 1. When the UE determines that there is at least one valid CSI request trigger or an uncanceled CSI request trigger through step S102 of Embodiment 1, or when the UE determines that there is at least one valid CSI request trigger through other means, then when the MAC entity of the UE obtains a sidelink resource for the first transmission or a new transmission, and the address available for transmission of this resource is the same as or corresponds to the address bound to or corresponding to this trigger, then the UE obtains information on the CSI report corresponding to this CSI request trigger from the lower layer (e.g., the physical layer), and instructs the Multiplexing and Assembly entity to generate a CSI report MAC CE. And optionally, send this CSI report MAC CE.

[0104] It should be noted that: when the address information bound to or corresponding to this CSI request trigger includes a destination address and a source address, from the perspective of UE A, if this destination address is ID-B and the source address is ID-A; then for UE B that sends the CSI report to UE A, the destination address should be ID-A and the source address should be ID-B. Then the "address available for transmission of this resource" should be from the perspective of UE B, and the destination address should be ID-A and the source address should be ID-B.

[0105] When the CSI request trigger - bound or corresponding address information has a destination address of ID - B and a source address of ID - A, it can be considered that the CSI request trigger - bound or corresponding address information corresponds to "the address where the resource can be used for transmission". If the CSI request trigger - bound or corresponding address information has a destination address of ID - A and a source address of ID - B, it can be considered that the CSI request trigger - bound or corresponding address information corresponds to "the address where the resource can be used for transmission". This correspondence means that the address information corresponding to the CSI report trigger is the address information for data or CSI request trigger sent from UE A to UE B, and for data or CSI request trigger received by UE B from UE A; while its corresponding address information is the address information for data or CSI report received by UE A from UE B, and for data or CSI report sent from UE B to UE A.

[0106] Embodiment 4

[0107] After the UE determines the address information corresponding to the CSI report through Embodiment 1 or 2 or other methods not mentioned in this article, when the UE generates a CSI report and indicates / transmits it to the upper layer, it is necessary to indicate the address information corresponding to this report at the same time; when the upper layer (such as the MAC layer) receives the CSI report indicated by the lower layer, it indicates the Multiplexing and Assembly entity to generate a CSI report MAC CE. The address information corresponding to this MAC CE is the address information indicated together with the CSI report.

[0108] Embodiment 5

[0109] When the UE is performing sidelink communication or V2X communication, there may be a lot of data to be sent to different addresses. Data sent to different addresses cannot be multiplexed in the same MAC PDU. Therefore, when the UE obtains sidelink / V2X resources, it is necessary to first determine the addresses where this resource can be used for transmission.

[0110] One possible way is as follows: When the UE obtains sidelink / V2X resources, if the UE needs to send a CSI report or a CSI report MAC CE to a certain address, or there is a valid or uncancelled CSI report trigger, and the corresponding address is the same as or corresponding to this address, then this address can be used as a candidate address for this resource. This address can be simply referred to as the address where a CSI report needs to be transmitted.

[0111] Furthermore, if this UE also needs to send service data to a certain address, and these service data respectively belong to one or more logical channels, and each logical channel has its corresponding logical channel priority, the highest priority among them can be selected as the priority corresponding to this address. If there are several addresses to which service data needs to be sent, then according to the priority corresponding to each address, the address with the highest corresponding priority is selected as the candidate address for this resource. It should be noted that the highest priority may correspond to the lowest priority value. For example, if the priority values of the logical channels are 1 and 3 respectively, then the logical channel with a priority value of 1 has a higher priority than the logical channel with a priority value of 3, and the priority of the logical channel with a priority value of 1 can be corresponding to the priority of this address, that is, the priority value of this address is 1.

[0112] When there are the above two types of candidate addresses, that is, one is the address where a CSI report needs to be transmitted, and the other is the address with the highest priority, there are the following three ways to determine the address for resource transmission:

[0113] Method 1: When there are the above two types of candidate addresses, the UE always uses the address where a CSI report needs to be transmitted as the address for transmitting with this resource. That is, only when there is no address where a CSI report needs to be transmitted, does the UE select the address with the highest priority as the transmission address for this resource.

[0114] Method 2: When there are the above two types of candidate addresses, the UE always uses the address with the highest priority as the transmission address for this resource. That is, only when there is no service data that needs to be transmitted, does the UE select the address where a CSI report needs to be transmitted as the address for transmitting with this resource.

[0115] Method 3: Pre-set or configure a priority threshold value. When the priority value corresponding to the address with the highest priority is lower than (or higher than) this priority threshold value, the UE selects the address with the highest priority as the transmission address for this resource; conversely, when the priority value corresponding to the address with the highest priority is higher than (or lower than) this threshold, then the UE selects the address where a CSI report needs to be transmitted as the address for transmitting using this resource.

[0116] Through this embodiment, the UE can select the address for sidelink resource transmission. When there is a CSI report for this address, operations such as those described in Embodiment 3 can be performed, thus enabling the transmission of the CSI report.

[0117] Embodiment 6

[0118] After the UE selects the address for sidelink resource transmission according to Embodiment 5 or other methods not mentioned in this article, the UE can packetize the MAC PDU. When there is both a CSI report MAC CE and data to be transmitted for this address, there is still a problem of how to determine the packetization order. Here is a possible method: When the UE determines the resources for transmission for a certain address, if there is both a CSI report MAC CE and data from a logical channel to be transmitted for this address, then when forming a MAC PDU packet, the priority of the CSI report MAC CE is always higher than that of the data from the logical channel group. For example, on this resource, the UE first reserves space for the CSI report MAC CE, or first fills the content / bit stream of the CSI report MAC CE on the transmission resource, and then, according to the priority of the logical channel or logical channel group, obtains data from high to low in sequence and performs packetization filling until all the resource space is used up.

[0119] In special cases, for example, if the priority of some logical channels is extremely high, then in order to satisfy the priority transmission of data on such logical channels, a threshold value can be set. This threshold value can be pre-configured by the network side or the base station in the configuration information sent to the UE or in the broadcast system information, and the UE receives this configuration information or system information. When the value of the priority of a certain logical channel is lower than this threshold value, the data from this logical channel is preferentially filled in the transmission resources. If there are multiple logical channels with values lower than this threshold value, then they are filled in order from the highest to the lowest priority of these logical channels until the data is filled completely or there is no remaining space. After the data of these logical channels is filled completely, if there is still remaining space, then the CSI report MAC CE is filled. Then, if there is still remaining space, the data from other logical channels with priorities higher than this threshold value is filled. Here, it is assumed that the priority value corresponding to the high priority is lower or smaller.

[0120] Embodiment 7

[0121] Since there are additional configurations for the sidelink resources, for example, the HARQ function of the sidelink resources can be activated / enabled or deactivated / disabled, then can the MAC PDU carrying the CSI report MAC CE be transmitted on such resources?

[0122] One approach is that regardless of whether the HARQ function of the sidelink resources is enabled, it can be used as the resource for transmitting the MAC PDU carrying the CSI report MAC CE. Then, when selecting the address, the HARQ function does not need to be considered, but the address selection is performed in the manner of Embodiment 5.

[0123] If the MAC PDU carrying the CSI report MAC CE can only be transmitted on the resources with the HARQ function enabled, then when performing the address selection, it is also necessary to consider whether the sidelink resources have the HARQ function enabled. The specific operations are as follows:

[0124] - If the sidelink resources obtained by the UE have the HARQ function enabled, then the UE takes both the address with the CSI report to be transmitted and the address with the data from the logical channels as the candidate addresses for address selection, and performs the address selection in the manner of Embodiment 5;

[0125] - If the sidelink resource obtained by the UE disables the HARQ function or does not enable the HARQ function, then the address where the CSI report needs to be transmitted cannot be used as a candidate address for address selection. That is, only the address containing data from the logical channel can be used as a candidate address for address selection, and the final address used for the transmission of this resource is selected / determined based on the priority among these addresses.

[0126] Enabling the HARQ function here means that for the transmitted MAC PDU, the receiving UE needs to feedback ACK (positive acknowledgement) or NACK (negative acknowledgment) confirmation information, and the transmitting UE needs to receive the feedback ACK / NACK confirmation information to determine whether to perform retransmission of the MAC PDU.

[0127] The sidelink resource enabling the HARQ function means that when the UE transmits a TB or MAC PDU on this sidelink resource enabling the HARQ function, the receiving UE needs to feedback the confirmation information ACK (positive acknowledgement) / NACK (negative acknowledgment) on the PSFCH resource bound to or corresponding to this resource regarding whether the MAC PDU is correctly decoded; and the transmitting UE needs to receive the confirmation information ACK / NACK on the corresponding PSFCH resource regarding whether the MAC PDU is correctly decoded, and determine whether to perform retransmission of the MAC PDU based on this confirmation information.

[0128] Embodiment 8

[0129] During the execution of Embodiment 5, there may be more than one address where the CSI report needs to be transmitted. Then, how to determine the final address to be transmitted among these addresses? Here, taking at least two addresses where the CSI reort needs to be transmitted as an example, address 1 and address 2, there can be the following three operation methods.

[0130] Method 1: Determine according to the priority of the logical channels to which the data to be transmitted by these two addresses belongs.

[0131] For example, when both address 1 and address 2 have CSI reprot to be transmitted, the UE further determines whether there is data to be transmitted for these two addresses.

[0132] If there is data to be transmitted at Address 1, and the priority value of the logical channel to which this data belongs is X; and there is also data to be transmitted at Address 2, and the priority value of the logical channel to which this data belongs is Y. Here, it is assumed that the larger the value, the lower the priority. Then when X < Y, it means that the priority of the data to be transmitted at Address 1 is higher than that of the data to be transmitted at Address 2. So, Address 1 is selected as the final transmission address.

[0133] Method 2 can also be determined based on whether there is data to be transmitted at these two addresses.

[0134] For another example, there is data to be transmitted at Address 1, and the priority value of the logical channel to which this data belongs is X; there is no data to be transmitted at Address 2, and only a CSI report needs to be transmitted. Then the UE selects Address 2, which only has a CSI report to be transmitted, as the final transmission address.

[0135] For another example, there is data to be transmitted at Address 1, and the priority value of the logical channel to which this data belongs is X; there is no data to be transmitted at Address 2, and only a CSI report needs to be transmitted. Then the UE selects Address 1, which has data to be transmitted in addition to the CSI report, as the final transmission address.

[0136] Method 2 can be regarded as a special implementation of Method 1. When there is no data to be transmitted at Address 2 and only a CSI report needs to be transmitted, it can be considered that the priority value of the data at Address 2 at this time is greater than the priority value of any logical channel. Then, according to the operation of Method 1, the UE selects the address with a higher priority (smaller value) as the final transmission address. Since the priority of the data to be transmitted at Address 1 is higher than that of the data to be transmitted at Address 2, Address 1 is selected as the final transmission address.

[0137] Or when there is no data to be transmitted at Address 2 and only a CSI report needs to be transmitted, it can be considered that the priority value of the data at Address 2 at this time is less than the value of any logical channel. Then, according to the operation of Method 1, the UE selects the address with a higher priority (smaller value) as the final transmission address. Since the priority of the data to be transmitted at Address 2 is always higher than that of the data to be transmitted at Address 1, Address 2 is selected as the final transmission address.

[0138] Method 3 can also determine the final address according to the time of generation of the CSI report.

[0139] If both Address 1 and Address 2 have CSI reports to be transmitted, the address to be selected can be determined according to the generation time of this CSI report.

[0140] For example, the CSI report for address 1 is generated at time slot N or received by the upper layer (e.g., the MAC layer) at time slot N, while the CSI report for address 2 is generated at time slot N+1 or received by the upper layer (e.g., the MAC layer) at time slot N+1, which is later than the time when the CSI report for address 1 is generated / received. Then the UE selects the address with the later generated / received CSI report, or the address with the CSI report whose generation / reception time is closest to the present (most recent) as the final transmission address, i.e., address 2. Here, "closest to the present" can refer to the time closest to the generation of the MAC PDU, or the time closest to the sidelink resource used for MAC PDU transmission, especially the starting time of the transmission. Here, the timeliness of the CSI report is mainly considered. Of course, the address with the earlier generated or received CSI report can be selected as the final transmission address, i.e., address 1. This is considered from the perspective of sending the CSI report as early as possible. Here, "earlier" means comparing the generation / reception time of the CSI report with the generation time of the MAC PDU or the sidelink resource used for MAC PDU transmission, especially the starting time of the transmission, and the CSI report with a longer or greater time interval is regarded as the earlier CSI report.

[0141] Similarly, which address to select can be determined according to the reception time of the CSI request trigger corresponding to the CSI report.

[0142] If both Address 1 and Address 2 have CSI reports to be transmitted, the address to be selected can be determined according to the reception time of the CSI request trigger corresponding to the CSI report. For example, the CSI request trigger corresponding to the CSI report of Address 1 is received at time slot N, while the CSI request trigger corresponding to the CSI report of Address 2 is received at time slot N+1, which is later than the reception time of the CSI request trigger of Address 1. Then the UE selects the address of the CSI reprot with the later received CSI request trigger as the final transmission address, or the address whose reception time of the CSI request trigger is closest to the present, that is, Address 2. Here, "closest to the present" can refer to the time closest to the generation time of the MAC PDU, or the time closest to the sidelink resource used for MAC PDU transmission, especially the start time of the transmission. The timeliness of the CSI reprot is mainly considered here. Of course, the address of the CSI report corresponding to the earlier received CSI report trigger can be selected as the final transmission address, that is, Address 1. This is considered from the perspective of sending the CSI report as early as possible. Here, "earlier" means comparing the reception time of the CSI report trigger with the generation time of the MAC PDU or the sidelink resource used for MAC PDU transmission, especially the start time of the transmission. The CSI report trigger with a longer or longer time interval is regarded as the earlier CSI report trigger.

[0143] The above three operation methods can be used alone or in combination. For example, when data is to be transmitted from both addresses, Method 1 is adopted; when there is no data transmission from both addresses and only CSI reports need to be transmitted, Method 3 is adopted; when there is data at one address and no data at the other address and only CSI reports are to be transmitted, Method 2 or a special implementation method of Method 1 is adopted.

[0144] Since the CSI report has timeliness, after a certain time, the content of the CSI report is no longer of reference value. Such a CSI report needs to be discarded. Since the CSI report can be discarded by the sending UE, that is, UE B, and can also be discarded by the receiving UE, that is, UE A, there are three implementation methods for discarding the CSI report (that is, Embodiment 9, Embodiment 10, and Embodiment 11).

[0145] Embodiment 9

[0146] Discard the CSI report at the receiving UE side, that is, UE A discards the timed-out CSI report.

[0147] Method 1

[0148] Set a receiving window or a timer at the physical layer of UE A. When the SCI sent by UE A contains the information of CSI request trigger, start the receiving window or the timer. It can also be when UE A finishes sending the CSI-RS signal, start the receiving window or the timer. The receiving window or the timer started in this way is associated with the layer 1 ID included in the SCI carrying the CSI request trigger.

[0149] When UE A receives the CSI report MAC CE, determine the address information associated with the CSI report MAC CE, or determine the address information associated with the CSI report included in the CSI report MAC CE.

[0150] The specific determination method can be:

[0151] This address information is the address information carried in the sub-header of the MAC PDU containing the CSI report MAC CE.

[0152] Or this address information is the layer 1 ID mapped / generated according to the address information in the sub-header of the MAC PDU. See Embodiment 2 for the specific mapping method or generation method.

[0153] Then the MAC layer indicates the relevant content of the CSI report included in the CSI report MAC CE and the determined address information associated with the CSI report to the lower layer (for example, the physical layer).

[0154] Based on this address information, the UE determines the corresponding reception window or timer. If the address information indicated by the upper layer is carried in the sub-header of the MAC PDU containing the CSI report MAC CE, the physical layer needs to map it to the layer 1 ID first. If the layer 1 ID is directly indicated, then the corresponding reception window or timer can be determined according to this layer 1 ID. If the reception window or timer has stopped or timed out, then discard the CSI report. If the reception window or timer is still running, then stop the reception window or timer. The CSI report in this case can be used for link quality evaluation and judgment.

[0155] As described above, from the perspective of UE B, when sending this CSI report MAC CE, the destination address should be ID-A and the source address is ID-B; then from the perspective of UE A, when sending a CSI request trigger, its destination address is ID-B and the source address is ID-A, and the layer 1 ID associated with the reception window or timer is obtained according to {destination address is ID-B, source address is ID-A}. Therefore, when UE A receives a CSI report, when determining the address information associated with the CSI report, it can be:

[0156] - Set the address information associated with the CSI report to the address information carried in the sub-header of the MAC PDU containing the CSI report MAC CE, that is, {destination address is ID-A, source address is ID-B}; or

[0157] - Determine the address information of the CSI report as {destination address is ID-B, source address is ID-A} based on the address information {destination address is ID-A, source address is ID-B} in the MAC PDU sub-header, and then send it to the lower layer; or

[0158] - It can also be to use the source address in the address information {destination address is ID-A, source address is ID-B} in the MAC PDU sub-header as the destination address and the destination address as the source address, and after such swapping, map it to the layer 1 ID and send it to the lower layer; or

[0159] - Based on the address information carried in the sub - header of the MAC PDU containing the CSI report MAC CE (the destination address is ID - A and the source address is ID - B), determine its corresponding address information, then map it to the layer 1 ID and send it to the lower layer together with the content of the CSI report. This corresponding relationship means that: the address information of the CSI request trigger is for the data or CSI request trigger sent by UE A to UE B, and for the data or CSI request trigger received by UE B from UE A; while the address information of the CSI report is for the data or CSI report received by UE A from UE B, and for the data or CSI report sent by UE B to UE A.

[0160] - It can also be that when the physical layer receives the address information {the destination address is ID - A and the source address is ID - B}, the physical layer takes the source address of this address information as the destination address and the destination address as the source address, and after such swapping, maps it to the layer 1 ID, and then looks up the corresponding receive window or timer. It can also be that first map the received address information to the layer 1 ID, and then take the source address of this layer 1 ID as the destination address and the destination address as the source address to look up the corresponding receive window or timer.

[0161] Method 2

[0162] Set a receive window or timer at the MAC layer of UE A.

[0163] When the CSI request trigger is sent or when the CSI - RS transmission is completed, the lower layer needs to indicate to the MAC layer that the CSI request is triggered. Based on the received indication that the CSI request is triggered, the MAC layer starts the receive window or timer.

[0164] Since the SCI carrying the CSI request trigger also schedules the transmission of the PSSCH, when generating the MAC PDU transmitted on the PSSCH, it is necessary to determine the address information of this MAC PDU. Therefore, the MAC layer can associate this CSI request trigger with the corresponding address information. That is, when the UE indicates the CSI request trigger in the SCI, associate this trigger with the address information of the MAC PDU transmitted on the SL grant / PSSCH scheduled by this SCI, and start the receive window or timer.

[0165] When receiving a CSI report MAC CE, use the method mentioned in Method 1 of this embodiment to determine the address information corresponding to the CSI report MAC CE, and search for the corresponding reception window or timer according to this address information. If the reception window or timer has stopped or timed out, then discard the CSI report MAC CE; if the reception window or timer is running, then stop the reception window or timer, and deliver the relevant content of the CSI report carried in the CSI report MAC CE to the lower layer (for example, the physical layer).

[0166] Preferably, the CSI report MAC CE also carries information related to CSI-RS, such as time or frequency information, and the MAC layer indicates this information and the CSI report to the lower layer together.

[0167] It can also be that when the MAC layer delivers the relevant content of the CSI report to the lower layer, it also delivers the address information corresponding to this CSI report to the lower layer. The determination of this address information can refer to the method in Method 1.

[0168] Embodiment 10

[0169] Discard the CSI report on the UE side that sends the CSI report, that is, UE B discards the timed-out CSI report.

[0170] When UE B receives a CSI request trigger indicated by the lower layer, or a CSI report indicated by the lower layer, or when UE B generates a CSI report MAC CE, start an associated transmission window or timer.

[0171] When the transmission window or timer times out:

[0172] If the CSI request trigger associated with the transmission window or timer still exists, or is in a pending state, then cancel the CSI request trigger;

[0173] If the CSI report indicated by the lower layer associated with the transmission window or timer has not been indicated to generate a CSI report MAC CE, then discard the CSI report;

[0174] If the CSI report MAC CE associated with the transmission window or timer has been generated but not yet packed into a MAC PDU, then discard the CSI report MAC CE;

[0175] If the CSI report MAC CE associated with the transmission window or timer has been carried in a MAC PDU but the MAC PDU has not been transmitted, then discard the MAC PDU; preferably, when the MAC PDU contains only the CSI report MAC CE, i.e., no other data such as MAC SDU, then discard the MAC PDU, otherwise, if the MAC PDU contains both the CSI report MAC CE and MAC SDU, then do not discard the MAC PDU.

[0176] When the transmission window or timer is running and the CSI report MAC CE associated with the transmission window or timer is carried in the MAC PDU for transmission, then stop the transmission window or timer.

[0177] Embodiment 11

[0178] The CSI report described in the above Embodiments 1 - 10 may at least include CQI (Channel Quality Indicator) channel quality indication, or RI (Rank Indicator) rank indication.

[0179] Optionally, it may also carry time information related to CQI / RI, such as time slots, or frequency information, such as carrier information, BWP (bandwidth part) information.

[0180] For example, if the UE makes measurements in time slot N and evaluates or calculates the values of CQI / RI based on the measurement results, then when reporting CQI / RI, it can report that the corresponding time is time slot N. Or if the UE makes measurements on carrier X numbered and evaluates or calculates the values of CQI / RI based on the measurement results, then when reporting CQI / RI, it can report that the corresponding frequency is carrier X.

[0181] Optionally, it can also carry information about the CSI request trigger. For example, if the UE receives a CSI request trigger in time slot N, then the time information of this CSI request trigger, such as time slot N, can be carried in the CSI report MAC CE triggered by this CSI request trigger. Another example is that if the UE receives a CSI request trigger on carrier X, then the frequency information of this CSI request trigger, such as carrier X, can be carried in the CSI report MAC CE triggered by this CSI request trigger.

[0182] It can also be that the received CSI request trigger carries an index / sequence number / number (index), then the index / sequence number / number (index) of this CSI request trigger can be carried in the CSI report MAC CE triggered by this CSI request trigger.

[0183] Through the above time information and / or frequency information, or index information, the UE receiving the CSI report can determine when the measurement for obtaining this CSI report was performed. If the valid time is exceeded, then this CSI report can be discarded.

[0184] Figure 3 It is a schematic block diagram of the user equipment UE involved in the present invention. As Figure 3 shown, the user equipment UE300 includes a processor 301 and a memory 302. The processor 301 can include, for example, a microprocessor, a microcontroller, an embedded processor, etc. The memory 302 can 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 memories, etc. Program instructions are stored on the memory 302. When these instructions are run by the processor 301, they can execute the above methods performed by the user equipment described in detail in the present invention.

[0185] The program running on the device according to the present invention can be a program that enables a computer to implement the functions of the embodiments of the present invention by controlling the central processing unit (CPU). The program or the information processed by this program can 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.

[0186] Programs for implementing the functions of the embodiments of the present invention can be recorded on a computer-readable recording medium. The corresponding functions can be implemented by causing a computer system to read the programs recorded on the recording medium and execute 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 peripheral devices). The "computer-readable recording medium" can be a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a recording medium for short-term dynamic storage of programs, or any other recording medium readable by a computer.

[0187] The various features or functional modules of the devices used in the above embodiments can be implemented or executed by circuits (for example, single-chip or multi-chip integrated circuits). The circuits designed to execute the functions described in this specification can include general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic, discrete hardware components, or any combination of the above devices. The general-purpose processor can be a microprocessor, or any existing processor, controller, microcontroller, or state machine. The above circuits can be digital circuits or analog circuits. In the case where new integrated circuit technologies have emerged to replace the existing integrated circuits due to the progress of semiconductor technology, one or more embodiments of the present invention can also be implemented using these new integrated circuit technologies.

[0188] In addition, the present invention is not limited to the above embodiments. Although various examples of the embodiments have been described, the present invention is not limited thereto. Fixed or non-mobile electronic devices installed indoors or outdoors can be used as terminal devices or communication devices, such as AV devices, kitchen devices, cleaning devices, air conditioners, office equipment, vending machines, and other household appliances, etc.

[0189] As described above, the embodiments of the present invention have been described in detail with reference to the accompanying drawings. However, the specific structure is not limited to the above embodiments, and the present invention also includes any design modifications that do not deviate from the gist of the present invention. In addition, various modifications can be made to the present invention within the scope of the claims, and the embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. Furthermore, the components having the same effects described in the above embodiments can be mutually replaced.

Claims

1. A user equipment, comprising: a processor; and a memory, electronically communicating with the processor, wherein instructions stored on the memory, when executed, cause: in the case of triggering a CSI report triggered by a channel state information CSI request received in side-link control information SCI: start a timer, in the case of the timer expiring: cancel triggering the CSI report, and in the case of determining that a media access control MAC protocol data unit PDU for transmission carries a CSI report MAC control element CE: stop the timer.

2. A method performed by a user equipment UE, the method comprising the steps of: in the case of triggering a CSI report triggered by a channel state information CSI request received in side-link control information SCI: start a timer, in the case of the timer expiring: cancel triggering the CSI report, and in the case of determining that a media access control MAC protocol data unit PDU for transmission carries a CSI report MAC control element CE: stop the timer.

Images