WO2025031336A1 - Sidelink transmission method and apparatus, and terminal and readable storage medium - Google Patents

Abstract

The present application belongs to the technical field of communications. Disclosed are a sidelink transmission method and apparatus, and a terminal and a readable storage medium. The sidelink transmission method in the embodiments of the present application comprises: a first terminal receiving a first message from a second terminal, wherein the first message is carried on a first carrier, the first message is used for requesting or triggering the first terminal to send a second message on the first carrier, and the second message is a feedback message based on the first message; and the first terminal executing a feedback behavior for the first message.

Description

Sidelink transmission method, device, terminal and readable storage medium

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to Chinese Patent Application No. 202310992700.2 filed in China on August 8, 2023, the entire contents of which are incorporated herein by reference.

Technical Field

The present application belongs to the field of communication technology, and specifically relates to a sidelink transmission method, device, terminal and readable storage medium.

Background Art

With the development of communication technology, the introduction of carrier aggregation (CA) communication scenarios is considered in the sidelink (SL) communication system. However, due to the limited carrier capacity and the half-duplex problem of the sidelink, the transmitting carrier and the receiving carrier used by the terminal may be different. When supporting SL CA, when the terminal receives a request or trigger message on the sidelink, how to accurately respond to the request or trigger message on the SL is an urgent problem to be solved.

Summary of the invention

The embodiments of the present application provide a sidelink transmission method, device, terminal and readable storage medium, which can solve the problem of how to accurately respond to the request or trigger message on the SL when the terminal receives a message requesting or triggering SL feedback on the sidelink while supporting SL CA.

In a first aspect, a sidelink transmission method is provided, comprising:

The first terminal receives a first message from the second terminal, where the first message is carried on a first carrier, and the first message is used to request or trigger the first terminal to send a second message on the first carrier, where the second message is a feedback message based on the first message;

The first terminal performs a feedback action for the first message.

In a second aspect, a sidelink transmission method is provided, including:

The second terminal sends a first message to the first terminal, where the first message is carried on a first carrier, and the first message is used to request or trigger the first terminal to send a second message on the first carrier, where the second message is a feedback message based on the first message;

The second terminal performs a receiving behavior related to the second message.

In a third aspect, a sidelink transmission device is provided, including:

A first receiving module, configured to receive a first message from a second terminal, where the first message is carried on a first carrier, and the first message is used to request or trigger the first terminal to send a second message on the first carrier, where the second message is a feedback message based on the first message;

The first sending module is used to execute a feedback action for the first message.

In a fourth aspect, a sidelink transmission device is provided, including:

A second sending module, configured to send a first message to a first terminal, where the first message is carried on a first carrier, and the first message is used to request or trigger the first terminal to send a second message on the first carrier, where the second message is a feedback message based on the first message;

The second receiving module is used to execute a receiving behavior related to the second message.

In a fifth aspect, a terminal is provided, which includes a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the method described in the first aspect are implemented, or the steps of the method described in the second aspect are implemented.

In a sixth aspect, a terminal is provided, comprising a processor and a communication interface, wherein the communication interface is used to receive a first message from a second terminal, the first message is carried on a first carrier, and the first message is used to request or trigger the first terminal to send a second message on the first carrier, the second message being a feedback message based on the first message; and perform feedback behavior for the first message.

Alternatively, the communication interface is used to send a first message to a first terminal, the first message is carried on a first carrier, and the first message is used to request or trigger the first terminal to send a second message on the first carrier, the second message is a feedback message based on the first message; and perform a receiving behavior related to the second message.

In the seventh aspect, a readable storage medium is provided, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the method described in the first aspect are implemented, or the steps of the method described in the second aspect are implemented.

In an eighth aspect, a wireless communication system is provided, including: a first terminal and a second terminal, wherein the first terminal can be used to execute the steps of the method described in the first aspect, and the second terminal can be used to execute the steps of the method described in the second aspect.

In the ninth aspect, a chip is provided, comprising a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement the method described in the first aspect, or to implement the method described in the second aspect.

In the tenth aspect, a computer program/program product is provided, wherein the computer program/program product is stored in a storage medium, and the program/program product is executed by at least one processor to implement the method as described in the first aspect, or to implement the method as described in the second aspect.

In an embodiment of the present application, a first terminal receives a first message from a second terminal, the first message is carried on a first carrier, and the first message is used to request or trigger the first terminal to send a second message on the first carrier, the second message is a feedback message based on the first message; the first terminal performs a feedback action for the first message. This clarifies how the terminal can effectively and accurately perform feedback actions for request or trigger messages on the SL in the SL CA scenario, and determines the carrier corresponding to the feedback message corresponding to the first message.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a block diagram of a wireless communication system to which an embodiment of the present application can be applied;

FIG2 is a flow chart of a sidelink transmission method according to an embodiment of the present application;

FIG3 is a second flow chart of a sidelink transmission method provided in an embodiment of the present application;

FIG4 is a third flow chart of a sidelink transmission method provided in an embodiment of the present application;

FIG5 is a fourth flow chart of a sidelink transmission method provided in an embodiment of the present application;

FIG6 is a schematic diagram of the structure of a sidelink transmission device provided in an embodiment of the present application;

FIG7 is a schematic diagram of the structure of another sidelink transmission device provided in an embodiment of the present application;

FIG8 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application;

FIG. 9 is a schematic diagram of the structure of a terminal provided in an embodiment of the present application.

DETAILED DESCRIPTION

The terms "first", "second", etc. of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of one type, and the number of objects is not limited, for example, the first object can be one or more. In addition, "or" in the present application represents at least one of the connected objects. For example, "A or B" covers three schemes, namely, Scheme 1: including A but not including B; Scheme 2: including B but not including A; Scheme 3: including both A and B. The character "/" generally indicates that the objects associated with each other are in an "or" relationship.

The term "indication" in this application can be a direct indication (or explicit indication) or an indirect indication (or implicit indication). A direct indication can be understood as the sender explicitly informing the receiver of specific information, operations to be performed, or request results in the sent indication; an indirect indication can be understood as the receiver determining the corresponding information according to the indication sent by the sender, or making a judgment and determining the operation to be performed or the request result according to the judgment result.

It is worth noting that the technology described in the embodiments of the present application is not limited to the Long Term Evolution (LTE)/LTE-Advanced (LTE-A) system, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency Division Multiple Access (SC-FDMA) or other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the described technology can be used for the above-mentioned systems and radio technologies as well as other systems and radio technologies. The following description describes a New Radio (NR) system for example purposes, and NR terms are used in most of the following descriptions, but these technologies can also be applied to systems other than NR systems, such as ^6th Generation (6G) communication systems.

FIG1 is a block diagram of a wireless communication system applicable to the embodiment of the present application. The wireless communication system includes a terminal 11 and a network side device 12. The terminal 11 may be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer), a personal digital assistant (Personal Digital Assistant, PDA), PDA, netbook, ultra-mobile personal computer (UMPC), mobile internet device (MID), augmented reality (AR), virtual reality (VR) equipment, robot, wearable device, flight vehicle, vehicle user equipment (VUE), shipborne equipment, pedestrian user equipment (PUE), smart home (home equipment with wireless communication function, such as refrigerator, TV, washing machine or furniture, etc.), game console, personal computer (PC), ATM or self-service machine and other terminal side equipment. Wearable devices include: smart watches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart bracelets, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, etc. Among them, vehicle-mounted equipment can also be called vehicle-mounted terminal, vehicle-mounted controller, vehicle-mounted module, vehicle-mounted component, vehicle-mounted chip or vehicle-mounted unit, etc. It should be noted that the specific type of the terminal 11 is not limited in the embodiment of the present application. The network side device 12 may include an access network device or a core network device, wherein the access network device may also be referred to as a radio access network (RAN) device, a radio access network function or a radio access network unit. The access network device may include a base station, a wireless local area network (WLAN) access point (AS) or a wireless fidelity (WiFi) node, etc. Among them, the base station may be referred to as a Node B (NB), an evolved Node B (eNB), a next generation Node B (gNB), a New Radio Node B (NR Node B), an access point, a Relay Base Station (RBS), a Serving Base Station (SBS), a Base Transceiver Station (BTS), a radio base station, a radio transceiver, a Basic Service Set (BSS), an Extended Service Set (ESS), a Home Node B (HNB), a Home Evolved Node B, a Transmission Reception Point (TRP) or other appropriate terms in the field. As long as the same technical effect is achieved, the base station is not limited to specific technical terms. It should be noted that in the embodiments of the present application, only the base station in the NR system is used as an example for introduction, and the specific type of the base station is not limited.

For ease of understanding, some contents involved in the embodiments of the present application are described below:

1. NR sidelink transmission.

Sidelink transmission refers to data transmission between terminals directly on the physical layer. LTE sidelink is based on broadcast communication and can be used to support basic safety communications of vehicle to everything (V2X), but is not suitable for other more advanced V2X services. 5G NR system supports more advanced sidelink transmission design, such as unicast, multicast or groupcast, so as to support a more comprehensive range of business types.

2. Carrier aggregation CA.

CA aggregates two or more component carriers (CCs) to support a larger transmission bandwidth. In fact, each component carrier corresponds to an independent cell, and one component carrier can usually be equated with one cell. In order to efficiently utilize fragmented spectrum, carrier aggregation supports aggregation between different component carriers:

Adjacent or non-adjacent carrier units in the same frequency band;

Carrier units within different frequency bands.

3. SL-CA.

LTE supports sidelink carrier aggregation SL-CA. Unlike the air interface (i.e. downlink and uplink), the carrier of SL-CA does not distinguish between the primary component carrier (PCC) and the secondary component carrier (SCC).

Each (pre)configured resource pool for sidelink communication transmission or reception is associated to a single carrier. When a user equipment (UE) supporting SL-CA uses mode 2 autonomous resource selection, one or more carriers for sidelink communication are first selected. The terminal's media access control (MAC) entity performs carrier selection based on the carrier's channel busy ratio (CBR) and the packet priority (PPPP) of the V2X message to be transmitted. When resource reselection is triggered, carrier reselection is performed. In order to avoid frequent switching between different carriers, if the CBR measured on this carrier is lower than the (pre)configured threshold, the UE can continue to use the selected carrier for transmission. All selected carriers should have the same synchronization reference or the same synchronization priority configuration. For terminals using mode2 autonomous resource selection, logical channel prioritization (LCP) is performed for each sidelink resource based on the CBR measured on the carrier and the PPPP of the corresponding sidelink logical channel (SL-Logical Channel, SL-LCH).

The carrier selection or reselection process is as follows:

For a SL process that triggers carrier selection or reselection, the following actions are performed:

If there is no SL grant associated with the SL process on any carrier allowed by the sidelink logical channel, and the sidelink logical channel has data to be sent: for each carrier associated with the sidelink logical channel, if the channel busy rate CBR measured by the current carrier is lower than the CBR threshold threshCBR-FreqReselection for controlling carrier reselection associated with the priority of the logical channel, the current carrier is considered to be a candidate carrier for carrier selection or reselection for sending the logical channel.

Otherwise (there is a carrier allowed by the sidelink logical channel and there is an SL authorization related to the SL process on it), for each sidelink logical channel with data to be sent, resource reselection is triggered on the current carrier: if the CBR of the current carrier is lower than the CBR threshold threshCBR-FreqKeeping for controlling carrier maintenance related to the priority of the logical channel, the current carrier and the resources in the related resource pool are selected (without switching the carrier); otherwise (the channel busy rate of the current carrier is not sufficient to meet the conditions for carrier maintenance), for each carrier allowed by the sidelink logical channel: if the CBR of the carrier is lower than the CBR threshold threshCBR-freqresselection for controlling carrier reselection related to the priority of the sidelink logical channel, the carrier is considered to be a candidate carrier for sending carrier selection or reselection.

NR SL CA reuses LTE SL CA to a great extent. Once carrier selection or reselection is triggered, the MAC entity of the terminal will select one or more candidate carriers and resources in the resource pool associated with the carrier in ascending order of CBR based on the terminal's capabilities.

4. NR sidelink channel status information reporting Sidelink CSI reporting.

The terminal can non-periodically trigger or report channel state information (CSI) on the side link, so that the triggering terminal can adjust the transmission signal in time according to the report of the reporting terminal to obtain better reception effect.

The terminal controls the SL-CSI reporting process through the sl-LatencyBoundCSI-Report parameter configured by the Radio Resource Control (RRC). Each pair of source layer-2ID and target layer-2ID maintains a side link channel state information report timer sl-CSI-ReportTimer, which is used to control the reporting terminal to comply with the delay requirement after receiving the triggering side link control information SCI of the triggering UE. The value of sl-CSI-ReportTimer is the same as the value of sl-LatencyBoundCSI-Report configured by RRC.

For each pair of source layer-2ID and destination layer-2ID corresponding to an established PC5-RRC connection with the upper layer, if the SL-CSI reporting procedure has been triggered by the sidelink control information SCI and has not been cancelled, the MAC entity of the reporting terminal shall have the following behavior:

If the sl-CSI-ReportTimer started for the triggered SL-CSI reporting process is not running: start the sl-CSI-ReportTimer;

If the sl-CSI-ReportTimer started for the triggered SL-CSI reporting process times out: cancel the triggered SL-CSI reporting process;

During the operation of the sl-CSI-ReportTimer started for the triggered SL-CSI reporting process, if the MAC entity has SL resources allocated for new transmission, and due to the logical channel priority sorting, the SL-SCH resources can accommodate the SL-CSI reporting MAC control element (CE) and its subheader, then perform at least one of the following: instruct the multiplexing and assembly process to generate the SL-CSI reporting MAC CE; stop the sl-CSI-ReportTimer for the triggered SL-CSI reporting process; cancel the triggered SL-CSI reporting process;

During the operation of the sl-CSI-ReportTimer started for the triggered SL-CSI reporting process, if the MAC entity is configured with resource allocation mode 1: trigger a scheduling request.

The sidelink transmission method provided in the embodiment of the present application is described in detail below through some embodiments and their application scenarios in combination with the accompanying drawings.

Referring to FIG. 2 , an embodiment of the present application provides a sidelink transmission method. As shown in FIG. 2 , the method includes:

Step 201: A first terminal receives a first message from a second terminal, where the first message is carried on a first carrier and is used to request or trigger the first terminal to send a second message on the first carrier, where the second message is a feedback message based on the first message.

Step 202: The first terminal performs a feedback action for the first message.

In the embodiment of the present application, the communication between the first terminal and the second terminal is SL unicast communication. By stipulating that the first terminal feeds back the second message on the same carrier after receiving the first message request or trigger, it is avoided that the carriers used by the sending terminal and the receiving terminal cannot be aligned in the SL CA scenario.

Optionally, the second message is a feedback message of the first message. For example, in some embodiments, the first message may be a message triggering channel measurement, and the second message may be a measurement report; in some embodiments, the first message may be a request message, and the second message may be a response message.

In the embodiment of the present application, a first terminal receives a first message from a second terminal, the first message is carried on a first carrier, and the first message is used to request or trigger the first terminal to send a second message on the first carrier, the second message is a feedback message based on the first message; the first terminal performs a feedback action for the first message. This clarifies how the terminal can effectively respond to the request or trigger message on the SL in the SL CA scenario. The feedback behavior is accurately performed, and the carrier corresponding to the feedback message corresponding to the first message is determined.

Optionally, in some embodiments, before the first terminal receives the first message from the second terminal, the method further includes:

The first terminal sends first indication information to the second terminal;

The first indication information is used to indicate any of the following:

The first terminal starts receiving the first carrier;

The first terminal selects or expects to receive on the first carrier.

In the embodiment of the present application, the above-mentioned start of reception can be understood as the reception is about to start or has started, wherein the reception is about to start can be understood as the interval between the current moment and the moment when the transmission starts is less than the preset duration. At this time, the second terminal can know that the reception of the first terminal on the first carrier is about to start or has started by referring to the first indication information. The first indication information is sent to the second terminal by the first terminal, so that the second terminal can determine the time to send the first message, ensuring that the first terminal can receive the first message. Therefore, the embodiment of the present application improves the reliability of communication.

For example, in some embodiments, the first terminal may send an Inter-UE Coordination (IUC) message to the second terminal, where the IUC message indicates a preferred resource set of the first terminal, where the preferred resource set is located on the first carrier. Thus, the IUC message implicitly indicates that the first terminal expects to receive on the preferred resource set next.

Optionally, in some embodiments, the feedback behavior includes any of the following:

sending the second message on the first carrier;

sending the second message on a second carrier;

It is determined not to send the second message.

In an embodiment of the present application, in a case where the second message cannot be sent on the first carrier, the first terminal may send the second message on the second carrier or determine not to send the second message. In a case where the second message cannot be sent on the first carrier, the first terminal sends the second message on the second carrier, thereby ensuring that the second terminal can receive the second message, thereby improving the reliability of communication. In a case where the second message cannot be sent on the first carrier, the first terminal determines not to send the second message, thereby avoiding the second terminal being unable to determine which carrier the second message is for the first message feedback.

Optionally, in some embodiments, sending the second message on the first carrier includes:

If a first condition is met, sending the second message on the first carrier;

The first condition includes any one of the following:

By referring to the second indication information from the second terminal, it is considered that the second terminal starts receiving the first carrier;

By referring to the second indication information from the second terminal, it is determined that the second terminal selects or expects to receive on the first carrier.

In the embodiment of the present application, the above-mentioned reception start can be understood as reception is about to start or reception has started, wherein, The reception is about to start can be understood as the interval between the current moment and the moment when the transmission starts is less than the preset duration. By referring to the second indication information from the second terminal, it is considered that the reception of the first carrier by the second terminal starts can be understood as knowing that the reception of the first carrier by the second terminal is about to start or has started by referring to the second indication information from the second terminal.

When the first condition is met, the second message is sent on the first carrier, thereby ensuring that the second terminal can receive the second message on the first carrier, thereby improving transmission reliability.

Optionally, in some embodiments, sending the second message on the second carrier includes:

When a second condition is met, sending the second message on a second carrier;

The second condition includes at least one of the following:

By referring to the resource reservation information of the second terminal, it is determined that the transmission resources reserved by the second terminal are on the first carrier, and it is considered that the transmission of the second terminal on the first carrier starts;

By referring to the second indication information from the second terminal, it is considered that the reception of the second terminal at the first carrier is interrupted;

By referring to the second indication information from the second terminal, it is considered that the second terminal starts sending the first carrier;

By referring to the second indication information from the second terminal, it is considered that the second terminal has switched the transmission carrier;

By referring to the second indication information from the second terminal, determining that the second terminal switches the transmission carrier to a carrier other than the first carrier;

By referring to the second indication information from the second terminal, it is considered that the second terminal starts receiving the second carrier;

By referring to the second indication information from the second terminal, it is considered that the second terminal selects or expects to receive on the second carrier.

In the embodiment of the present application, the above-mentioned start of transmission can be understood as the transmission is about to start or the transmission has started, wherein the transmission is about to start can be understood as the interval between the current moment and the moment of transmission start is less than the preset duration. It should be understood that through the above-mentioned start of transmission, combined with the half-duplex characteristics of the sidelink communication of the terminal, the first terminal can further infer that the reception of the second terminal may be interrupted on the first carrier, thereby reducing the possibility of transmission failure.

Optionally, the reception interruption may be understood as reception is about to be interrupted or has been interrupted, and the reception is about to be interrupted may be understood as the interval between the current moment and the moment when the interruption starts is less than a preset duration.

Optionally, the second indication information may be understood as an IUC message or carried by an IUC message.

Optionally, in some embodiments, the determining not to send the second message includes:

If the third condition is met, determine not to send the second message;

The third condition includes at least one of the following:

By referring to the resource reservation information of the second terminal, it is determined that the transmission resources reserved by the second terminal are on the first carrier, and it is considered that the transmission of the second terminal on the first carrier starts;

By referring to the second indication information from the second terminal, it is considered that the reception of the second terminal at the first carrier is interrupted;

By referring to the second indication information from the second terminal, it is considered that the second terminal starts sending the first carrier;

By referring to the second indication information from the second terminal, it is considered that the second terminal switches the transmission carrier;

By referring to the second indication information from the second terminal, determining that the second terminal switches the transmission carrier to a carrier other than the first carrier;

In the case where the second message is a sidelink channel state information reporting media access control layer control element SL-CSI Reporting MAC CE, the first terminal does not obtain transmission resources on the first carrier that can accommodate the SL-CSI Reporting MAC CE and its subheader.

In the embodiment of the present application, the first terminal failing to obtain transmission resources capable of accommodating the SL-CSI Reporting MAC CE and its subheader on the first carrier can be understood as failing to obtain transmission resources capable of accommodating the first SL-CSI Reporting MAC CE and its subheader, wherein the first SL-CSI Reporting MAC CE does not carry carrier information, that is, the first SL-CSI Reporting MAC CE can be understood as a MAC CE that does not carry carrier information.

Optionally, by referring to the resource reservation information of the second terminal, it is determined that the transmission resources reserved by the second terminal are on the first carrier, and when it is considered that the second terminal starts sending the first carrier, the first terminal may consider that the reception of the second terminal on the first carrier is interrupted.

Optionally, in some embodiments, the second indication information is used to indicate at least one of the following:

The second terminal switches a transmission carrier to a carrier other than the first carrier;

The second terminal switches the transmission carrier;

The reception of the first carrier by the second terminal is interrupted.

In this embodiment of the present application, the first terminal may, based on the second indication information, believe that the second terminal switches the transmitting carrier to a carrier other than the first carrier, or believe that the second terminal switches the transmitting carrier, or believe that the second terminal interrupts reception of the first carrier.

Optionally, in some embodiments, the second carrier satisfies at least one of the following:

The second carrier is any transmitting carrier currently being used by the first terminal;

The second carrier is a default carrier, and the default carrier is predefined.

In the embodiment of the present application, the second terminal and the first terminal can send and receive the first message and the second message on the default carrier, that is, both the first terminal and the second terminal need to maintain the default carrier as the sending carrier and the receiving carrier.

Optionally, in some embodiments, when the second message is carried by the second carrier, the second message carries carrier information of the first carrier.

In the embodiment of the present application, the second message carries the carrier information, so that the second terminal can determine, based on the carrier information carried by the second message, for which carrier the second message is sent as feedback of the first message, so that the second terminal can correctly understand the second message.

Optionally, in some embodiments, the first message is side link control information SCI for triggering side link channel state information reporting, and the second message is SL-CSI Reporting MAC CE.

Optionally, the first terminal performing a feedback behavior for the first message includes:

While the target timer for controlling SL-CSI reporting is running, the first terminal performs a feedback behavior for the first message.

Optionally, the method further comprises at least one of the following:

When the first terminal obtains transmission resources capable of accommodating the SL-CSI Reporting MAC CE and its subheader on the first carrier, the first terminal generates the second message based on the measurement result of the first carrier, where the second message is the first SL-CSI Reporting MAC CE;

The first terminal does not obtain transmission resources on the first carrier that can accommodate the SL-CSI Reporting MAC CE and its subheader, or, when the second condition is met, the first terminal generates the second message based on the measurement result of the first carrier, and the second message is a second SL-CSI Reporting MAC CE; wherein the first SL-CSI Reporting MAC CE does not carry the carrier information of the first carrier, and the second SL-CSI Reporting MAC CE carries the carrier information of the first carrier.

In the embodiment of the present application, the first SL-CSI Reporting MAC CE and the second SL-CSI Reporting MAC CE can be understood as two MAC CEs of different formats. Among them, the second SL-CSI Reporting MAC CE can be understood as a MAC CE carrying carrier information.

In order to better understand the present application, some specific examples are given below for detailed description.

In some embodiments, it may be specified that the triggering and reporting of SL-CSI reporting are performed on the same carrier. For example, UE-1 ensures that the SCI that triggers the SL-CSI report can be received by UE-2 by referring to the UE-2 resource reservation information, and UE-1 triggers the SL-CSI report for the carrier that sends the SCI; UE-2 reports the SL-CSI report on the carrier that receives the SCI, and if the SL-CSI report cannot be sent using the same carrier as the received SCI, the sending of the SL-CSI report is canceled. Among them, SL unicast communication is performed between the second terminal and the first terminal, referring to Figure 3, which specifically includes the following processes:

Step 31, the second terminal sends a first SCI on the first carrier, that is, the second terminal triggers the SL-CSI reporting process of the first terminal through the first sidelink control information SCI.

Optionally, before sending the first SCI, the second terminal refers to the first indication information of the first terminal to learn that the first terminal is about to or has started receiving the first carrier, or learns that the first terminal has selected or expects to receive on the first carrier, and determines that the first carrier is the object carrier of the SL-CSI reporting process.

Step 32: When receiving the first SCI, the first terminal starts the target timer and measures the CSI-RS according to the first SCI to obtain the SL-CSI measurement result. That is, if the first terminal receives the first SCI from the second terminal on the first carrier, the first terminal considers that the first SCI is used to trigger the SL-CSI reporting process for the first carrier.

Optionally, if there is no target timer (sl-CSI-ReportTimer) running for controlling SL-CSI reporting, the first terminal starts a target timer for the SL-CSI reporting process for the first carrier.

Optionally, if the target timer times out, the first terminal cancels the SL-CSI reporting process for the first carrier.

Optionally, according to the first SCI, the first terminal measures a sidelink channel state information reference signal SL CSI-RS on the first carrier to obtain a SL-CSI measurement result for the first carrier.

Step 33: before the target timer times out, the first terminal performs a first behavior, where the first behavior includes one of the following:

A, if the first terminal obtains on the first carrier a MAC CE capable of accommodating Sidelink CSI Reporting and The sending resources of its sub-header perform the following actions: further generate a first Sidelink CSI Reporting MAC CE based on the SL-CSI measurement result for the first carrier; the first terminal sends the first Sidelink CSI Reporting MAC CE on the first carrier; the first terminal stops the target timer.

Optionally, before sending the first Sidelink CSI Reporting MAC CE, the first terminal refers to the second indication information of the second terminal to learn that the first terminal is about to receive or has started receiving the first carrier, and determines that the first carrier is a receiving carrier.

B. If the first terminal learns through the resource reservation information of the second terminal and/or the second indication information of the second terminal that the reception of the second terminal on the first carrier is about to be or has been interrupted, or learns that the transmission of the second terminal on the first carrier is about to be or has been started, or learns that the second terminal will switch the transmitting carrier to other carriers other than the first carrier, or learns that the second terminal is about to switch the transmitting carrier or has switched the transmitting carrier, the first terminal cancels the triggered reporting process of the SL-CSI report for the first carrier; the first terminal stops the target timer.

C. If the first terminal does not obtain transmission resources that can accommodate the Sidelink CSI Reporting MAC CE and its subheader on the first carrier, the first terminal cancels the triggered reporting process of the SL-CSI report for the first carrier; the first terminal stops the target timer.

Step 34: If the second terminal receives the first Sidelink CSI Reporting MAC CE from the first terminal on the first carrier, the second terminal considers that the first Sidelink CSI Reporting MAC CE is an SL-CSI report for the first carrier. If the second terminal does not receive the first Sidelink CSI Reporting MAC CE from the first terminal on the first carrier, the second terminal considers that the SL-CSI reporting process of the first terminal for the first carrier has failed.

Optionally, obtaining transmission resources on the first carrier that can accommodate the Sidelink CSI Reporting MAC CE and its subheader includes: when the first terminal has a first Sidelink CSI Reporting MAC CE to be sent, the first terminal selects or reselects the first carrier as the transmission carrier; and the size of resources obtained by the first terminal on the transmission carrier is greater than or equal to the size of the Sidelink CSI Reporting MAC CE and its subheader.

The method for the first terminal to select or reselect the first carrier as a transmission carrier includes: selecting or reselecting the first carrier as a transmission carrier when it is determined that the first carrier meets a carrier selection or reselection criterion.

Optionally, carrier selection criteria: for the case where the first carrier is not used for SL transmission, the carrier selection criteria may depend on relevant mechanisms and are not further defined herein. For example, when the Channel Busy Ratio (CBR) value of the first carrier is less than the first CBR threshold value corresponding to the carrier selection, the first carrier meets the carrier selection criteria; or, when the SL Reference Signal Received Power (SL-RSRP) value of the first carrier is less than the first SL-RSRP threshold value corresponding to the carrier selection, the first carrier meets the carrier selection criteria.

Optionally, carrier reselection criteria: For the case where the first carrier is being used for SL transmission, the carrier selection criteria may depend on the relevant mechanism and are not further limited here. For example, when the CBR value of the first carrier is less than the second CBR threshold value corresponding to the carrier reservation, the first carrier satisfies the carrier reselection criteria; or, when the SL-RSRP value of the first carrier is less than the second SL-RSRP threshold value corresponding to the SL carrier reservation, Then the first carrier meets the carrier reselection criterion.

In some embodiments, it can be specified that the triggering and reporting of SL-CSI reporting are performed on the same carrier. For example, UE-1 ensures that the SCI that triggers the SL-CSI report can be received by UE-2 by referring to the UE-2 resource reservation information, and UE-1 triggers the SL-CSI report for the carrier that sends the SCI; UE-2 ensures that the reported SL-CSI report can be received by UE-1 by referring to the UE-1 resource reservation information, and reports the SL-CSI report on any used carrier. Among them, SL unicast communication is performed between the second terminal and the first terminal, referring to Figure 4, which specifically includes the following processes:

Step 41, the second terminal sends a first SCI on the first carrier, that is, the second terminal triggers the SL-CSI reporting process of the first terminal through the first sidelink control information SCI.

Optionally, before sending the first SCI, the second terminal refers to the first indication information of the first terminal to learn that the first terminal is about to or has started receiving the first carrier, or learns that the first terminal has selected or expects to receive on the first carrier, and determines that the first carrier is the object carrier of the SL-CSI reporting process.

Step 42, when receiving the first SCI, the first terminal starts the target timer, and measures the CSI-RS according to the first SCI to obtain the SL-CSI measurement result, that is, if the first terminal receives the first SCI from the second terminal on the first carrier, the first terminal considers that the first SCI is used to trigger the SL-CSI reporting process for the first carrier.

Optionally, if there is no target timer (sl-CSI-ReportTimer) running, the first terminal starts a target timer for the SL-CSI reporting process for the first carrier.

Optionally, if the target timer times out, the first terminal cancels the SL-CSI reporting process for the first carrier.

Optionally, according to the first SCI, the first terminal measures a sidelink channel state information reference signal SL CSI-RS on the first carrier to obtain a SL-CSI measurement result for the first carrier.

Step 43: Before the target timer times out, the first terminal performs a second behavior, where the first behavior includes one of the following:

If the first terminal does not obtain transmission resources capable of accommodating Sidelink CSI Reporting MAC CE and its subheader on the first carrier, and/or based on the target information, it is known that the second terminal is about to or has interrupted the reception of the first carrier, and/or based on the target information, it is known that the second terminal is about to or has started sending on the first carrier, and/or based on the target information, it is known that the second terminal switches the sending carrier to other carriers other than the first carrier, and/or based on the target information, it is known that the second terminal is about to or has switched the sending carrier, if the first terminal obtains transmission resources capable of accommodating Sidelink CSI Reporting MAC CE and its subheader on the second carrier, then a second Sidelink CSI Reporting MAC CE is further generated based on the SL-CSI measurement result for the first carrier; the first terminal sends the second Sidelink CSI Reporting MAC CE on the second carrier; and the first terminal stops the target timer.

The target information includes at least one of the resource reservation information derivation of the second terminal and the second indication information of the second terminal.

Optionally, before sending the second Sidelink CSI Reporting MAC CE, the first terminal refers to the second indication information of the second terminal to learn that the second terminal is about to receive or has started receiving the second carrier, or learns that the second terminal has Upon selecting or expecting to receive on a second carrier, the second carrier is determined as a transmitting carrier.

Step 44, the second terminal receives a second Sidelink CSI Reporting MAC CE from the first terminal on the second carrier. Based on the information contained in the second Sidelink CSI Reporting MAC CE, the second terminal considers that the second Sidelink CSI Reporting MAC CE is an SL-CSI report for the first carrier. If the second terminal does not receive the first Sidelink CSI Reporting MAC CE from the first terminal on any carrier, the second terminal considers that the SL-CSI reporting process of the first terminal for the first carrier has failed.

Optionally, the second carrier includes any one of the following:

1. A transmission carrier currently being used by the first terminal; optionally, the method of obtaining transmission resources on the second carrier that can accommodate Sidelink CSI Reporting MAC CE and its subheader includes: when the first terminal has a second Sidelink CSI Reporting MAC CE to be sent, the first terminal selects or reselects the second carrier as the transmission carrier; the size of the transmission resources obtained by the first terminal on the second carrier is greater than or equal to the size of Sidelink CSI Reporting MAC CE and its subheader. Optionally, the method of the first terminal selecting or reselecting the second carrier as the transmission carrier includes: when it is determined that the second carrier meets the carrier selection or reselection criteria, selecting or reselecting the second carrier as the transmission carrier.

2. A default carrier, wherein the default carrier is predefined. Optionally, the obtaining of transmission resources on the second carrier that can accommodate the Sidelink CSI Reporting MAC CE and its subheader comprises: when the first terminal has a second Sidelink CSI Reporting MAC CE to be sent, the first terminal uses the second carrier as a transmission carrier; and the size of the transmission resources obtained by the first terminal on the second carrier is greater than or equal to the size of the Sidelink CSI Reporting MAC CE and its subheader.

5 , an embodiment of the present application further provides a sidelink transmission method. As shown in FIG5 , the sidelink transmission method includes:

Step 501: A second terminal sends a first message to a first terminal, where the first message is carried on a first carrier and is used to request or trigger the first terminal to send a second message on the first carrier, where the second message is a feedback message based on the first message;

Step 502: The second terminal performs a receiving behavior related to the second message.

Optionally, the second terminal sending the first message to the first terminal includes:

When the fourth condition is met, the second terminal sends a first message to the first terminal;

The fourth condition includes any one of the following:

By referring to the first indication information from the first terminal, it is considered that the first terminal starts receiving the first carrier;

By referring to the first indication information from the first terminal, it is determined that the first terminal selects or expects to receive on the first carrier.

Optionally, after the second terminal sends the first message to the first terminal, the method further includes:

The second terminal sends second indication information to the first terminal, where the second indication information is used to indicate at least one of the following:

The second terminal switches a transmission carrier to a carrier other than the first carrier;

The second terminal switches the transmission carrier;

The reception of the first carrier by the second terminal is interrupted.

Optionally, after the second terminal sends the first message to the first terminal, the method further includes:

The second terminal reserves transmission resources on the first carrier and generates corresponding resource reservation information, wherein the resource reservation information is used to indicate the start of transmission of the second terminal on the first carrier.

Optionally, after the second terminal performs a receiving behavior related to the second message, the method further includes at least one of the following:

When the second terminal receives the second message, the second terminal considers that the second message is feedback for the first message;

In a case where the second terminal does not receive the second message, the second terminal considers that the first terminal fails to provide feedback on the first message.

Optionally, the second message is carried on the first carrier or the second carrier.

Optionally, the second carrier satisfies at least one of the following:

The second carrier is any transmitting carrier currently being used by the first terminal;

The second carrier is a default carrier, and the default carrier is predefined.

Optionally, when the second message is carried by a second carrier, the second message carries carrier information of the first carrier.

Optionally, the first message is side link control information SCI used to trigger a side link channel state information report, and the second message is a side link channel state information reporting media access control element SL-CSI Reporting MAC CE.

The sidelink transmission method provided in the embodiment of the present application may be executed by a sidelink transmission device. In the embodiment of the present application, the sidelink transmission device provided in the embodiment of the present application is described by taking the sidelink transmission device executing the sidelink transmission method as an example.

6 , the embodiment of the present application further provides a sidelink transmission device. As shown in FIG6 , the sidelink transmission device 600 further includes:

A first receiving module 601 is configured to receive a first message from a second terminal, where the first message is carried on a first carrier and is used to request or trigger the first terminal to send a second message on the first carrier, where the second message is a feedback message based on the first message;

The first sending module 602 is used to execute a feedback action for the first message.

Optionally, the first sending module 602 is further used to: send first indication information to the second terminal;

The first indication information is used to indicate any of the following:

The first terminal starts receiving the first carrier;

The first terminal selects or expects to receive on the first carrier.

Optionally, the feedback behavior includes any of the following:

sending the second message on the first carrier;

sending the second message on a second carrier;

It is determined not to send the second message.

Optionally, the sending the second message on the first carrier includes:

If a first condition is met, sending the second message on the first carrier;

The first condition includes any one of the following:

By referring to the second indication information from the second terminal, it is considered that the second terminal starts receiving the first carrier;

By referring to the second indication information from the second terminal, it is determined that the second terminal selects or expects to receive on the first carrier.

Optionally, the first sending module 602 is specifically configured to: send the second message on a second carrier when a second condition is met;

The second condition includes at least one of the following:

By referring to the resource reservation information of the second terminal, it is determined that the transmission resources reserved by the second terminal are on the first carrier, and it is considered that the transmission of the second terminal on the first carrier starts;

By referring to the second indication information from the second terminal, it is considered that the reception of the second terminal at the first carrier is interrupted;

By referring to the second indication information from the second terminal, it is considered that the second terminal starts sending the first carrier;

By referring to the second indication information from the second terminal, it is considered that the second terminal switches the transmission carrier;

By referring to the second indication information from the second terminal, determining that the second terminal switches the transmission carrier to a carrier other than the first carrier;

By referring to the second indication information from the second terminal, it is considered that the second terminal starts receiving the second carrier;

By referring to the second indication information from the second terminal, it is considered that the second terminal selects or expects to receive on the second carrier.

Optionally, the determining not to send the second message includes:

If the third condition is met, determine not to send the second message;

The third condition includes at least one of the following:

By referring to the resource reservation information of the second terminal, it is determined that the transmission resources reserved by the second terminal are on the first carrier, and it is considered that the transmission of the second terminal on the first carrier starts;

By referring to the second indication information from the second terminal, it is considered that the reception of the second terminal at the first carrier is interrupted;

By referring to the second indication information from the second terminal, it is considered that the second terminal starts sending the first carrier;

By referring to the second indication information from the second terminal, it is considered that the second terminal switches the transmission carrier;

By referring to the second indication information from the second terminal, determining that the second terminal switches the transmission carrier to a carrier other than the first carrier;

The second message is a sidelink channel state information report media access control layer control unit SL-CSI In the case of SL-CSI Reporting MAC CE, the first terminal does not obtain transmission resources on the first carrier that can accommodate the SL-CSI Reporting MAC CE and its subheader.

Optionally, the second indication information is used to indicate at least one of the following:

The second terminal switches a transmission carrier to a carrier other than the first carrier;

The second terminal switches the transmission carrier;

The reception of the first carrier by the second terminal is interrupted.

Optionally, the second carrier satisfies at least one of the following:

The second carrier is any transmitting carrier currently being used by the first terminal;

The second carrier is a default carrier, and the default carrier is predefined.

Optionally, when the second message is carried by the second carrier, the second message carries carrier information of the first carrier.

Optionally, the first message is side link control information SCI used to trigger side link channel state information reporting, and the second message is SL-CSI Reporting MAC CE.

Optionally, the first sending module 602 is specifically used for: providing feedback on the first message during the operation of a target timer for controlling SL-CSI reporting.

Optionally, the sidelink transmission device 600 further includes a generating module, configured to perform at least one of the following:

When the sidelink transmission device 600 obtains transmission resources capable of accommodating the SL-CSI Reporting MAC CE and its subheader on the first carrier, the sidelink transmission device 600 generates the second message based on the measurement result of the first carrier, where the second message is the first SL-CSI Reporting MAC CE;

The side-link transmission device 600 does not obtain transmission resources on the first carrier that can accommodate the SL-CSI Reporting MAC CE and its subheader, or, when the second condition is met, generates the second message based on the measurement result of the first carrier, and the second message is a second SL-CSI Reporting MAC CE; wherein the first SL-CSI Reporting MAC CE does not carry the carrier information of the first carrier, and the second SL-CSI Reporting MAC CE carries the carrier information of the first carrier.

7 , the embodiment of the present application further provides a sidelink transmission device. As shown in FIG7 , the sidelink transmission device 700 further includes:

A second sending module 701 is configured to send a first message to a first terminal, where the first message is carried on a first carrier and the first message is used to request or trigger the first terminal to send a second message on the first carrier, where the second message is a feedback message based on the first message;

The second receiving module 702 is used to execute a receiving behavior related to the second message.

Optionally, the second sending module 701 is specifically configured to:

When the fourth condition is met, sending a first message to the first terminal;

The fourth condition includes any one of the following:

By referring to the first indication information from the first terminal, it is considered that the first terminal starts receiving the first carrier;

By referring to the first indication information from the first terminal, it is determined that the first terminal selects or expects to receive on the first carrier.

Optionally, the second sending module 701 is further used to: send second indication information to the first terminal, where the second indication information is used to indicate at least one of the following:

The second terminal switches the transmission carrier to a carrier other than the first carrier;

The second terminal switches the transmission carrier;

The second terminal interrupts reception of the first carrier.

Optionally, the sidelink transmission device 700 further includes:

The processing module is used to reserve sending resources on the first carrier and generate corresponding resource reservation information, wherein the resource reservation information is used to indicate the start of sending of the second terminal on the first carrier.

Optionally, the sidelink transmission device 700 further includes: a processing module, the processing module being configured to perform at least one of the following:

In the case where the sidelink transmission device 700 receives the second message, it is considered that the second message is feedback for the first message;

In the case that the sidelink transmission device 700 does not receive the second message, it is considered that the feedback of the first terminal to the first message fails.

Optionally, the second message is carried on the first carrier or the second carrier.

Optionally, the second carrier satisfies at least one of the following:

The second carrier is any transmitting carrier currently being used by the first terminal;

The second carrier is a default carrier, and the default carrier is predefined.

Optionally, when the second message is carried by a second carrier, the second message carries carrier information of the first carrier.

Optionally, the first message is side link control information SCI used to trigger a side link channel state information report, and the second message is a side link channel state information reporting media access control element SL-CSI Reporting MAC CE.

The sidelink transmission device in the embodiment of the present application may be an electronic device, such as an electronic device with an operating system, or a component in an electronic device, such as an integrated circuit or a chip. The electronic device may be a terminal, or may be other devices other than a terminal. Exemplarily, the terminal may include but is not limited to the types of terminal 11 listed above, and other devices may be servers, network attached storage (NAS), etc., which are not specifically limited in the embodiment of the present application.

The side-link transmission device provided in the embodiment of the present application can implement the various processes implemented in the method embodiments of Figures 2 to 5 and achieve the same technical effect. To avoid repetition, it will not be repeated here.

As shown in FIG8 , the embodiment of the present application further provides a communication device 800, including a processor 801 and a memory 802, wherein the memory 802 stores a program or instruction that can be run on the processor 801, and when the program or instruction is executed by the processor 801, each step of the above-mentioned sidelink transmission method embodiment is implemented, and the same technical effect can be achieved. To avoid repetition, I will not go into details here.

The embodiment of the present application also provides a terminal, including a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement the steps in the method embodiment shown in Figure 2 or Figure 5. This terminal embodiment corresponds to the above-mentioned terminal side method embodiment, and each implementation process and implementation method of the above-mentioned method embodiment can be applied to the terminal embodiment and can achieve the same technical effect. Specifically, Figure 9 is a schematic diagram of the hardware structure of a terminal implementing an embodiment of the present application.

The terminal 900 includes but is not limited to: a radio frequency unit 901, a network module 902, an audio output unit 903, an input unit 904, a sensor 905, a display unit 906, a user input unit 907, an interface unit 908, a memory 909 and at least some of the components of a processor 910.

Those skilled in the art will appreciate that the terminal 900 may also include a power source (such as a battery) for supplying power to each component, and the power source may be logically connected to the processor 910 through a power management system, so as to implement functions such as managing charging, discharging, and power consumption management through the power management system. The terminal structure shown in FIG9 does not constitute a limitation on the terminal, and the terminal may include more or fewer components than shown in the figure, or combine certain components, or arrange components differently, which will not be described in detail here.

It should be understood that in the embodiment of the present application, the input unit 904 may include a graphics processing unit (GPU) 9041 and a microphone 9042, and the graphics processor 9041 processes the image data of the static picture or video obtained by the image capture device (such as a camera) in the video capture mode or the image capture mode. The display unit 906 may include a display panel 9061, and the display panel 9061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 907 includes a touch panel 9071 and at least one of other input devices 9072. The touch panel 9071 is also called a touch screen. The touch panel 9071 may include two parts: a touch detection device and a touch controller. Other input devices 9072 may include, but are not limited to, a physical keyboard, function keys (such as a volume control key, a switch key, etc.), a trackball, a mouse, and a joystick, which will not be repeated here.

In the embodiment of the present application, after receiving downlink data from the network side device, the RF unit 901 can transmit the data to the processor 910 for processing; in addition, the RF unit 901 can send uplink data to the network side device. Generally, the RF unit 901 includes but is not limited to an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

The memory 909 can be used to store software programs or instructions and various data. The memory 909 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area may store an operating system, an application program or instruction required for at least one function (such as a sound playback function, an image playback function, etc.), etc. In addition, the memory 909 may include a volatile memory or a non-volatile memory. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), a static random access memory (SRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), a double data rate synchronous dynamic random access memory (DDRSDRAM), an enhanced synchronous dynamic random access memory (ESDRAM), a synchronous linked dynamic random access memory (SDRAM), a volatile memory (e ... The memory 909 in the embodiment of the present application includes but is not limited to these and any other suitable types of memory.

The processor 910 may include one or more processing units; optionally, the processor 910 integrates an application processor and a modem processor, wherein the application processor mainly processes operations related to an operating system, a user interface, and application programs, and the modem processor mainly processes wireless communication signals, such as a baseband processor. It is understandable that the modem processor may not be integrated into the processor 910.

Among them, the radio frequency unit 901 is used to receive a first message from a second terminal, the first message is carried on a first carrier, and the first message is used to request or trigger the first terminal to send a second message on the first carrier, and the second message is a feedback message based on the first message; and perform feedback behavior for the first message.

Alternatively, the radio frequency unit 901 is used to send a first message to a first terminal, the first message is carried on a first carrier, and the first message is used to request or trigger the first terminal to send a second message on the first carrier, the second message is a feedback message based on the first message; and perform receiving behavior related to the second message.

It can be understood that the implementation process of each implementation method mentioned in this embodiment can refer to the relevant description of the method embodiment and achieve the same or corresponding technical effect. To avoid repetition, it will not be repeated here.

An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, each process of the above-mentioned sidelink transmission method embodiment is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

The processor is the processor in the terminal described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk. In some examples, the readable storage medium may be a non-transient readable storage medium.

An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned sidelink transmission method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

The embodiment of the present application further provides a computer program/program product, which is stored in a storage medium, and is executed by at least one processor to implement the various processes of the above-mentioned sidelink transmission method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

An embodiment of the present application also provides a wireless communication system, including: a first terminal and a second terminal, wherein the first terminal can be used to execute the steps of the sidelink transmission method on the first terminal side as described above, and the second terminal can be used to execute the steps of the sidelink transmission method on the second terminal side as described above.

It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "comprises a..." do not exclude There are other identical elements in the process, method, article or device that includes the element. In addition, it should be noted that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may be added, omitted or combined. In addition, the features described with reference to certain examples may be combined in other examples.

Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of a computer software product plus a necessary general hardware platform, and of course, can also be implemented by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, disk, CD, etc.), including several instructions to enable a terminal or a network-side device to execute the methods described in each embodiment of the present application.

The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms of implementation methods without departing from the purpose of the present application and the scope of protection of the claims, and these implementation methods are all within the protection of the present application.

Claims (31)

A sidelink transmission method, comprising: The first terminal receives a first message from the second terminal, where the first message is carried on a first carrier, and the first message is used to request or trigger the first terminal to send a second message on the first carrier, where the second message is a feedback message based on the first message; The first terminal performs a feedback action for the first message. The method according to claim 1, wherein before the first terminal receives the first message from the second terminal, the method further comprises: The first terminal sends first indication information to the second terminal; The first indication information is used to indicate any of the following: The first terminal starts receiving the first carrier; The first terminal selects or expects to receive on the first carrier. The method according to claim 1 or 2, wherein the feedback behavior comprises any one of the following: sending the second message on the first carrier; sending the second message on a second carrier; It is determined not to send the second message. The method according to claim 3, wherein the sending the second message on the first carrier comprises: If a first condition is met, sending the second message on the first carrier; The first condition includes any one of the following: By referring to the second indication information from the second terminal, it is considered that the second terminal starts receiving the first carrier; By referring to the second indication information from the second terminal, it is determined that the second terminal selects or expects to receive on the first carrier. The method according to claim 3, wherein sending the second message on the second carrier comprises: When a second condition is met, sending the second message on a second carrier; The second condition includes at least one of the following: By referring to the resource reservation information of the second terminal, it is determined that the transmission resources reserved by the second terminal are on the first carrier, and it is considered that the transmission of the second terminal on the first carrier starts; By referring to the second indication information from the second terminal, it is considered that the reception of the second terminal at the first carrier is interrupted; By referring to the second indication information from the second terminal, it is considered that the second terminal starts sending the first carrier; By referring to the second indication information from the second terminal, it is considered that the second terminal switches the transmission carrier; By referring to the second indication information from the second terminal, determining that the second terminal switches the transmission carrier to a carrier other than the first carrier; By referring to the second indication information from the second terminal, it is considered that the second terminal starts receiving the second carrier. beginning; By referring to the second indication information from the second terminal, it is considered that the second terminal selects or expects to receive on the second carrier. The method according to claim 3, wherein the determining not to send the second message comprises: If the third condition is met, determine not to send the second message; The third condition includes at least one of the following: By referring to the resource reservation information of the second terminal, it is determined that the transmission resources reserved by the second terminal are on the first carrier, and it is considered that the transmission of the second terminal on the first carrier starts; By referring to the second indication information from the second terminal, it is considered that the reception of the second terminal at the first carrier is interrupted; By referring to the second indication information from the second terminal, it is considered that the second terminal starts sending the first carrier; By referring to the second indication information from the second terminal, it is considered that the second terminal switches the transmission carrier; By referring to the second indication information from the second terminal, determining that the second terminal switches the transmission carrier to a carrier other than the first carrier; In a case where the second message is a sidelink channel state information reporting media access control layer control element SL-CSI Reporting MAC CE, the first terminal does not obtain transmission resources on the first carrier that can accommodate the SL-CSI Reporting MAC CE and its subheader. The method according to any one of claims 4 to 6, wherein the second indication information is used to indicate at least one of the following: The second terminal switches a transmission carrier to a carrier other than the first carrier; The second terminal switches the transmission carrier; The reception of the first carrier by the second terminal is interrupted. The method according to any one of claims 3 to 7, wherein the second carrier satisfies at least one of the following: The second carrier is any transmitting carrier currently being used by the first terminal; The second carrier is a default carrier, and the default carrier is predefined. The method according to any one of claims 3 to 8, wherein, when the second message is carried by the second carrier, the second message carries carrier information of the first carrier. The method according to any one of claims 3 to 9, wherein the first message is side link control information SCI for triggering a side link channel state information report, and the second message is SL-CSI Reporting MAC CE. The method according to claim 10, wherein the first terminal performing a feedback behavior for the first message comprises: While the target timer for controlling SL-CSI reporting is running, the first terminal performs a feedback behavior for the first message. The method according to claim 11, wherein the method further comprises at least one of the following: When the first terminal obtains transmission resources capable of accommodating the SL-CSI Reporting MAC CE and its subheader on the first carrier, the first terminal generates the second message based on the measurement result of the first carrier, The second message is the first SL-CSI Reporting MAC CE; The first terminal does not obtain transmission resources on the first carrier that can accommodate the SL-CSI Reporting MAC CE and its subheader, or, when the second condition is met, the first terminal generates the second message based on the measurement result of the first carrier, and the second message is a second SL-CSI Reporting MAC CE; wherein the first SL-CSI Reporting MAC CE does not carry the carrier information of the first carrier, and the second SL-CSI Reporting MAC CE carries the carrier information of the first carrier. A sidelink transmission method, comprising: The second terminal sends a first message to the first terminal, where the first message is carried on a first carrier, and the first message is used to request or trigger the first terminal to send a second message on the first carrier, where the second message is a feedback message based on the first message; The second terminal performs a receiving behavior related to the second message. The method according to claim 13, wherein the second terminal sending the first message to the first terminal comprises: When the fourth condition is met, the second terminal sends a first message to the first terminal; The fourth condition includes any one of the following: By referring to the first indication information from the first terminal, it is considered that the first terminal starts receiving the first carrier; By referring to the first indication information from the first terminal, it is determined that the first terminal selects or expects to receive on the first carrier. The method according to claim 13 or 14, wherein after the second terminal sends the first message to the first terminal, the method further comprises: The second terminal sends second indication information to the first terminal, where the second indication information is used to indicate at least one of the following: The second terminal switches a transmission carrier to a carrier other than the first carrier; The second terminal switches the transmission carrier; The reception of the first carrier by the second terminal is interrupted. The method according to claim 13 or 14, wherein after the second terminal sends the first message to the first terminal, the method further comprises: The second terminal reserves transmission resources on the first carrier and generates corresponding resource reservation information, wherein the resource reservation information is used to indicate the start of transmission of the second terminal on the first carrier. The method according to any one of claims 13 to 16, wherein after the second terminal performs a receiving behavior related to the second message, the method further comprises at least one of the following: When the second terminal receives the second message, the second terminal considers that the second message is feedback for the first message; In a case where the second terminal does not receive the second message, the second terminal considers that the first terminal fails to provide feedback on the first message. The method according to any one of claims 13 to 17, wherein the second message is carried on the first carrier or the second carrier. The method according to claim 18, wherein the second carrier satisfies at least one of the following: The second carrier is any transmitting carrier currently being used by the first terminal; The second carrier is a default carrier, and the default carrier is predefined. The method according to any one of claims 13 to 19, wherein, when the second message is carried by a second carrier, the second message carries carrier information of the first carrier. The method according to any one of claims 13 to 20, wherein the first message is side link control information SCI for triggering a side link channel state information report, and the second message is a side link channel state information reporting media access control element SL-CSI Reporting MAC CE. A sidelink transmission device, comprising: A first receiving module, configured to receive a first message from a second terminal, where the first message is carried on a first carrier, and the first message is used to request or trigger the first terminal to send a second message on the first carrier, where the second message is a feedback message based on the first message; The first sending module is used to execute a feedback action for the first message. The apparatus according to claim 22, wherein the feedback behavior comprises any one of the following: sending the second message on the first carrier; sending the second message on a second carrier; It is determined not to send the second message. The apparatus of claim 23, wherein the sending the second message on the first carrier comprises: If a first condition is met, sending the second message on the first carrier; The first condition includes any one of the following: By referring to the second indication information from the second terminal, it is considered that the second terminal starts receiving the first carrier; By referring to the second indication information from the second terminal, it is determined that the second terminal selects or expects to receive on the first carrier. The apparatus of claim 23, wherein sending the second message on the second carrier comprises: When a second condition is met, sending the second message on a second carrier; The second condition includes at least one of the following: By referring to the resource reservation information of the second terminal, it is determined that the transmission resources reserved by the second terminal are on the first carrier, and it is considered that the transmission of the second terminal on the first carrier starts; By referring to the second indication information from the second terminal, it is considered that the reception of the second terminal at the first carrier is interrupted; By referring to the second indication information from the second terminal, it is considered that the second terminal starts sending the first carrier; By referring to the second indication information from the second terminal, it is considered that the second terminal switches the transmission carrier; By referring to the second indication information from the second terminal, it is determined that the second terminal switches the transmission carrier to the carrier other than the a carrier other than the first carrier; By referring to the second indication information from the second terminal, it is considered that the second terminal starts receiving the second carrier; By referring to the second indication information from the second terminal, it is considered that the second terminal selects or expects to receive on the second carrier. The apparatus of claim 23, wherein the determining not to send the second message comprises: If the third condition is met, determine not to send the second message; The third condition includes at least one of the following: By referring to the resource reservation information of the second terminal, it is determined that the transmission resources reserved by the second terminal are on the first carrier, and it is considered that the transmission of the second terminal on the first carrier starts; By referring to the second indication information from the second terminal, it is considered that the reception of the second terminal at the first carrier is interrupted; By referring to the second indication information from the second terminal, it is considered that the second terminal starts sending the first carrier; By referring to the second indication information from the second terminal, it is considered that the second terminal switches the transmission carrier; By referring to the second indication information from the second terminal, determining that the second terminal switches the transmission carrier to a carrier other than the first carrier; In a case where the second message is a sidelink channel state information reporting media access control layer control element SL-CSI Reporting MAC CE, the first terminal does not obtain transmission resources on the first carrier that can accommodate the SL-CSI Reporting MAC CE and its subheader. A sidelink transmission device, comprising: A second sending module, configured to send a first message to a first terminal, where the first message is carried on a first carrier, and the first message is used to request or trigger the first terminal to send a second message on the first carrier, where the second message is a feedback message based on the first message; The second receiving module is used to execute a receiving behavior related to the second message. The device according to claim 27, wherein the second sending module is specifically configured to: send the first message to the first terminal when the fourth condition is met; The fourth condition includes any one of the following: By referring to the first indication information from the first terminal, it is considered that the first terminal starts receiving the first carrier; By referring to the first indication information from the first terminal, it is determined that the first terminal selects or expects to receive on the first carrier. The apparatus according to claim 27 or 28, wherein the second sending module is further used to: send second indication information to the first terminal, wherein the second indication information is used to indicate at least one of the following: The second terminal switches the transmission carrier to a carrier other than the first carrier; The second terminal switches the transmission carrier; The second terminal interrupts reception of the first carrier. A terminal comprises a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the sidelink transmission method according to any one of claims 1 to 21 are implemented. A readable storage medium storing a program or instruction, wherein the program or instruction, when executed by a processor, implements the steps of the sidelink transmission method according to any one of claims 1 to 21.