Carrier determination method and terminal

Abstract

The present application discloses a carrier determination method, an apparatus, a terminal, and a readable storage medium, which belong to the field of communication technology. The carrier determination method of an embodiment of the present application includes: a terminal determines a second carrier and / or a third carrier from a plurality of first carriers based on first information of at least a portion of the carriers among the plurality of first carriers, where the second carrier is used to determine synchronization information of a second carrier and / or synchronization information of a fourth carrier, the plurality of third carriers are used to perform sidelink SL transmission, the plurality of first carriers satisfy a first condition, and the plurality of third carriers satisfy a second condition.

Description

[Technical field]

[0001] The present application relates to the field of communications technology, and specifically to a carrier determination method, an apparatus, a terminal, and a readable storage medium. [Background technology]

[0002] Currently, when carrier aggregation technology is applied to the New Radio (NR) sidelink, the synchronization reference timing between different carriers does not match, which can lead to a series of problems, such as half-duplex problems in transmission and reception and transmission power attenuation, which can affect the transmission efficiency of the communication system.

[0003] Thus, how to achieve timing synchronization between carriers has become an issue that requires an immediate solution. Summary of the Invention [Problem to be solved by the invention]

[0004] The embodiments of the present application provide a carrier determination method, an apparatus, a terminal, and a readable storage medium that can solve the problem of poor transmission efficiency in a communication system due to mismatched synchronization reference timing between different carriers. [Means for solving the problem]

[0005] A first aspect provides a carrier determination method, the method comprising: The terminal determines a second carrier and / or a third carrier from the first carriers based on first information of at least a part of the first carriers; wherein the second carrier is used to determine second carrier synchronization information and / or fourth carrier synchronization information; the third carriers are used for sidelink (SL) transmission, the plurality of first carriers satisfy a first condition; The third carriers satisfy a second condition.

[0006] A second aspect provides a carrier determination apparatus, the apparatus comprising: A determining module for determining a second carrier and / or a plurality of third carriers from the plurality of first carriers based on first information of at least a portion of the plurality of first carriers; wherein the second carrier is used to determine second carrier synchronization information and / or fourth carrier synchronization information; the third carriers are used for sidelink (SL) transmission, the plurality of first carriers satisfy a first condition; The third carriers satisfy a second condition.

[0007] A third aspect provides a terminal, the terminal including a processor and a memory, the memory storing a program or instructions operable to run on the processor, the program or instructions being operable when executed by the processor to implement the steps of the method of the first aspect.

[0008] A fourth aspect provides a terminal, the terminal including a processor and a communication interface, wherein the processor is adapted to determine a second carrier and / or a third carrier from a plurality of first carriers based on first information of at least a portion of the plurality of first carriers; wherein the second carrier is used to determine second carrier synchronization information and / or fourth carrier synchronization information; the third carriers are used for sidelink (SL) transmission, the plurality of first carriers satisfy a first condition; The third carriers satisfy a second condition.

[0009] A fifth aspect provides a communication system, the communication system including a terminal and a network side device, the terminal being adapted to execute steps of the carrier determination method according to the first aspect.

[0010] A sixth aspect provides a readable storage medium having stored thereon a program or instructions which, when executed by a processor, implements the steps of the method of the first aspect.

[0011] A seventh aspect provides a chip, the chip including a processor and a communication interface, the communication interface coupled to the processor, the processor running a program or instructions and adapted to implement the method of the first aspect.

[0012] An eighth aspect provides a computer program / program product, the computer program / program product being stored in a storage medium, the computer program / program product being executed by at least one processor to implement the steps of the carrier determination method described in the first aspect. Effect of the Invention

[0013] In an embodiment of the present application, a terminal determines a second carrier and / or a third carrier from a plurality of first carriers based on first information of at least some of the first carriers, where the second carrier is used to determine synchronization information of the second carrier and / or synchronization information of a fourth carrier, and the third carriers are used to perform sidelink SL transmission, and the first carriers satisfy a first condition, and the third carriers satisfy a second condition. According to this method, the terminal can determine a second carrier, determine synchronization information of itself and other carriers via the second carrier, and perform sidelink transmission via the third carrier, thus realizing timing synchronization when each carrier performs sidelink data transmission, thereby improving the reliability of the communication system. [Brief description of the drawings]

[0014] [Figure 1] 1 is a block diagram of a wireless communication system to which an embodiment of the present application can be applied. [Diagram 2] FIG. 2 is a schematic diagram of a carrier determination method according to an embodiment of the present application; [Diagram 3] 1 is a structural schematic diagram of a carrier determination device according to an embodiment of the present application; [Figure 4] 1 is a structural schematic diagram of a communication device according to an embodiment of the present application; [Diagram 5] FIG. 2 is a schematic diagram of the hardware structure of a terminal according to an embodiment of the present application; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The following clearly describes the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present application are all within the scope of protection of the present application.

[0016] The terms "first," "second," etc. in the specification and claims of the present application are intended to distinguish between similar objects and are not intended to describe a particular order or sequence. It is to be understood that the terms so used are interchangeable where appropriate, such that the embodiments of the present application may be performed in an order other than that shown or described herein, and that the objects distinguished by "first" and "second" are generally of the same type and do not limit the number of objects, e.g., the first object may be one or more. It is to be noted that "and / or" in the specification and claims represents at least one of the objects connected, and the character " / " generally represents an "or" relationship between the related objects.

[0017] It should be noted that the techniques described in the embodiments of the present application are not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, but can also be applied to 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), and other systems. The terms "system" and "network" in the embodiments of the present application are always used interchangeably, and the techniques described may be used in the above-mentioned systems and radio technologies, or in other systems and radio technologies. Although the following description describes a New Radio (NR) system for illustrative purposes and uses NR terminology in most of the description below, these techniques may be applied to applications other than NR system applications, such as 6th Generation (6G) communication systems.

[0018] 1 is a block diagram of a wireless communication system to which the embodiment of the present application can be applied. The wireless communication system includes a terminal 11 and a network side device 12. Here, the terminal 11 may be a terminal device such as a mobile phone, a tablet personal computer, a laptop computer (also called a notebook computer), a personal digital assistant (PDA), a palmtop computer, a netbook, an ultra-mobile personal computer (UMPC), a mobile Internet device (MID), an augmented reality (AR) / virtual reality (VR) device, a robot, a wearable device, a vehicle-mounted equipment (VUE), a pedestrian terminal (PUE), a smart home (home equipment having a wireless communication function, such as a refrigerator, a television, a washing machine, or furniture), a game console, a personal computer (PC), a deposit machine, or a self-service machine, and the wearable device includes a smart watch, a smart wristband, a smart earphone, a smart glasses, a smart accessory (a smart bracelet, a smart hand chain, a smart ring, a smart necklace, a smart ankle bracelet, a smart anklet, etc.), a smart band, a smart clothing, etc. It should be noted that the terminal 11 in the embodiment of the present application is not limited to a specific type. The network side equipment 12 may include an access network equipment or a core network equipment, where the access network equipment 12 may be called a radio access network equipment, a radio access network (Radio Access Network, RAN), a radio access network function or a radio access network unit.The access network equipment 12 may include a base station, a WLAN access point, or a WiFi node, and the base station may be called a Node B, an evolved Node B (eNB), an access point, a base transceiver station (BTS), a radio base station, a radio transceiver, a basic service set (BSS), an extended service set (ESS), a home B node, a home evolved B node, a transmitting receiving point (TRP), or any other suitable term in the art. As long as the same technical effect is achieved, the base station is not limited to a specific technical term, and it should be explained that in the embodiments of the present application, only a base station in an NR system is introduced as an example, and the specific type of the base station is not limited.

[0019] The following provides an interpretation of nouns for some technical terms related to the embodiments of this application.

[0020] 1. Carrier aggregation To meet the LTE-A downlink peak speed of 1 Gbps and uplink peak speed of 500 Mbps, a transmission bandwidth of up to 100 MHz needs to be provided. However, since there is a shortage of continuous spectrum with such a large bandwidth, LTE-A proposes the carrier aggregation solution.

[0021] Carrier Aggregation (CA) is the aggregation of two or more Component Carriers (CC) to support larger transmission bandwidth (up to 100 MHz). In practice, each component carrier corresponds to one independent cell. In general, one component carrier can be equivalent to one cell. The maximum bandwidth of each component carrier is 20 MHz. To efficiently utilize the fragmented spectrum, carrier aggregation supports aggregation between different component carriers.

[0022] 1) Component carriers of the same or different bandwidth 2) Adjacent or non-adjacent component carriers within the same frequency band 3) Component carriers in different frequency bands It should be noted that from the baseband implementation point of view, there is no difference between these cases, which mainly affects the implementation complexity of the radio frequency unit.

[0023] 2. Sidelink The Long Term Evolution (LTE) system supports sidelink (SL) transmission for direct data transmission between terminal user equipment (UE) without network equipment since the 12th release version. As a matter of clarification, Sidelink can be translated as Side Link, Side Link, Edge Link, etc.

[0024] The LTE sidelink design supports two resource allocation modes: scheduled resource allocation mode and autonomous resource selection mode. The former is controlled by the network side device to allocate resources to each UE, and the latter is that the UE autonomously selects resources.

[0025] Starting with the 15th release version, LTE supports sidelink carrier aggregation (CA). Unlike the Uu interface (i.e. downlink and uplink), CA in LTE sidelink does not distinguish between primary component carrier (PCC) and secondary component carrier (SCC). A UE in autonomous resource selection mode performs resource sensing and resource reservation independently on each CC.

[0026] The design of the LTE sidelink is applicable to certain public safety services (e.g., emergency communications in disaster areas such as fires or earthquakes) or vehicle-to-everything (V2X) communications. Vehicle-to-everything communications include various services such as basic safety-related communications, advanced (autonomous) driving, formations, sensor extensions, etc. Since the LTE sidelink only supports broadcast communications, it is mainly used for basic safety-related communications, and other advanced V2X services are supported by the NR sidelink.

[0027] The 5G NR system may be used in operating frequency bands above 6 GHz that are not supported by LTE, supporting a larger operating bandwidth, and the NR system also supports Sidelink interface communication for direct communication between terminals.

[0028] 3. NR Sidelink Synchronization Process Sidelink communication needs to consider different communication scenarios, such as in-network coverage, out-of-network coverage, some network coverage, and terminals are located in different cells. In sidelink communication, in order to ensure normal transmission and reception of data, synchronization needs to be performed between terminals, so it is necessary to ensure synchronization between terminals in various scenarios.

[0029] In cellular communication, a terminal can communicate only by receiving a synchronization signal of a network and acquiring synchronization between networks. In sidelink communication, a terminal may be located in a cell or outside a cell, and two terminals performing sidelink communication may be located in the same cell or different cells, or one may be located in a cell and the other may be located outside a cell, or both may be located outside a cell. Therefore, various types of synchronization references are introduced in sidelink communication to meet communication needs of various scenarios. A synchronization reference is a device that can provide synchronization information, and synchronization reference types supported in the NR Sidelink system may include a global navigation satellite system (GNSS), an eNB, a gNB, a UE, a terminal internal clock, etc.

[0030] Before performing sidelink communication, a terminal first searches for a synchronization reference. Since there are various types of synchronization references, the terminal may search for different types of synchronization references, and these different types of synchronization references may not be synchronized. At this time, the time between terminals synchronized to different types of synchronization references may not be synchronized, and sidelink communication cannot be performed between them. Therefore, priority levels of synchronization references are defined in sidelink communication, and the terminal selects a synchronization reference with the highest priority level to maintain global synchronization as much as possible in sidelink communication, thereby avoiding reduction in transmission efficiency or reliability problems due to asynchrony.

[0031] The synchronization reference priorities defined in the NR Sidelink system are as shown in Table 1 below.

[0032] [Table 1]

[0033] Because GNSS and gNB / ENB may not be synchronized, in the NR Sidelink system, when GNSS is configured to the highest priority, it is supported to disable P3 / P4 / P5 levels by network-configured information or pre-configured information, i.e., to include only P0 / P1 / P2 / P6 levels. At this time, the synchronization information of all terminals (excluding terminals that obtain synchronization information based on the terminal internal clock) is obtained based on GNSS, which can ensure that all terminals are synchronized. This is because when gNB / eNB is configured to the highest priority, P3' / P4' / P5' cannot be disabled at this time, and all out-of-network terminals still need to obtain synchronization information based on GNSS.

[0034] Before performing sidelink communication, a terminal needs to first determine a synchronization reference and obtain synchronization information based on the synchronization reference, and a terminal that meets the conditions will transmit a bypass synchronization source SLSS and a bypass broadcast channel PSBCH on the sidelink to assist other terminals in performing synchronization, and the terminal needs to determine an SLSS identifier ID corresponding to the SLSS transmitted by this terminal based on the synchronization reference, determine PSBCH content based on the synchronization reference, and determine the synchronization reference for transmitting the SLSS and PSBCH.

[0035] 4. LTE V2X synchronous carrier selection process In the LTE V2X carrier aggregation design, from the perspective of the transmitting end UE, the carriers of the aggregation all refer to the same synchronization reference to achieve timing synchronization on the aggregation carrier. The specific process is that the UE selects a synchronization carrier, takes the synchronization reference corresponding to the synchronization carrier as the synchronization reference of other aggregation carriers, and determines the timing of other carriers according to the timing corresponding to the synchronization carrier.

[0036] To achieve synchronization carrier selection, a set Set A is defined, where Set A includes carriers that can potentially be used as the synchronization carrier, and the UE selects Set B from Set A, where Set B includes the available set of synchronization carriers, and further selects one synchronization carrier from Set B.

[0037] In one example, the terminal obtains synchronization parameters based on configuration by the network, where the synchronization reference type parameter includes a synchronization reference type (typeTxSync) parameter, which instructs the terminal to preferentially select an eNB or GNSS as a synchronization reference, i.e., the eNB or GNSS is configured to have a higher priority; below are several examples in which the terminal determines a synchronization carrier based on the synchronization reference type parameter:

[0038] Exemplarily, when the parameter typeTxSync is set to the eNB, the terminal selects one CC from the intersection set of Set A and CCs used for sidelink transmission as a synchronization carrier, For example, when the parameter typeTxSync is set to GNSS and the GNSS signal is reliable, the terminal selects one GNSS-reliable CC from the intersection set of Set A and CCs used for sidelink transmission as a synchronization carrier; For example, when the parameter typeTxSync is set to GNSS and the GNSS signal is not reliable, select a synchronization reference for each CC in the intersection of Set A and the CC used for Sidelink transmission. In this example, there are two cases:

[0039] Case 1: When there is at least one CC whose synchronization reference is a UE that is directly or indirectly synchronized with the GNSS, the terminal selects one CC as a synchronization carrier from the CC whose synchronization reference is a UE that is directly or indirectly synchronized with the GNSS. Case 2: When the synchronization reference of all CCs is the eNB, the UE selects one CC from the intersection set of Set A and the CC used for sidelink transmission as a synchronization carrier. In another example, the terminal obtains synchronization parameters based on configuration by the network, where the synchronization reference type (typeTxSync) parameter is included, and the following are further examples of the terminal determining the synchronization carrier based on the synchronization reference type parameter:

[0040] Exemplarily, when the parameter typeTxSync is set to eNB, select a synchronization reference for each CC in the intersection set of CCs of SetA and CA, and select the CC with the highest priority from among them as the synchronization carrier according to the following priorities:

[0041] P1: CC where the synchronization reference is a UE that directly synchronizes with the eNB P2: CC whose synchronization reference is a UE that indirectly synchronizes to the eNB P3: CC whose synchronization reference is GNSS P4: CC where the synchronization reference is a GNSS UE that is directly synchronized to the eNB P5: CC, where the synchronization reference is a GNSS UE indirectly synchronized to the eNB P6: CC whose synchronization reference is the remaining UE For example, when the parameter typeTxSync is set to GNSS and the GNSS signal is reliable, the terminal selects one GNSS-reliable CC from the intersection set of Set A and CCs used for sidelink transmission as a synchronization carrier; For example, when the parameter typeTxSync is set to GNSS and the GNSS signal is unreliable, a synchronization reference is selected for each CC in the intersection of Set A and the CC used for sidelink transmission, and the CC with the highest priority is selected as the synchronization carrier according to the following priorities:

[0042] P1: CC where the synchronization reference is a UE that directly synchronizes with the eNB P1: CC where the synchronization reference is a UE that is directly synchronized to GNSS P2: CC whose synchronization reference is a UE that indirectly synchronizes to the eNB P2: CC whose synchronization reference is a UE indirectly synchronized to GNSS P3: CC whose synchronization reference is the remaining UE with priority In the following, the carrier determination method according to the embodiments of the present application will be described in detail through several embodiments and its application scenarios in conjunction with the drawings.

[0043] In the related art, when applying carrier aggregation technology to NR Sidelink, if the timing between different carriers is not aligned, it may lead to a series of problems, such as half-duplex problems in transmission and reception and transmission power attenuation problems, which may affect the transmission efficiency of the NR Sidelink system. Therefore, timing synchronization should be performed using the same synchronization reference between different carriers. Specifically, the terminal selects a synchronization carrier and uses the synchronization parameters of the synchronization carrier as the synchronization reference for other aggregation carriers, so that the synchronization timing of all aggregation carriers is obtained based on the same synchronization reference, thereby making all carrier aggregations timing synchronized.

[0044] Furthermore, since the synchronization / sidelink transmission configuration of each carrier may be different, for example, when GNSS is configured with the highest priority, P3 / P4 / P5 level may be disabled by network information or pre-configuration information, i.e., different carriers may have different sl-NbAsSync configurations and different synchronization reference priority orders. For example, there exists CC1 configured with sl-NbAsSync true, the synchronization reference priority order of CC1 is P0 / P1 / P2 / P3 / P4 / P5 / P6, and the synchronization reference is P3, and CC3 configured with sl-NbAsSync false, the synchronization reference priority order of CC3 is P0 / P1 / P2 / P6, and the synchronization reference is P6. When selecting CC1 as the synchronization carrier, the terminal determines that the synchronization reference of CC1 is the synchronization reference of CC3, i.e., the synchronization reference of CC3 is P3, and the sl-NbAsSync configuration of CC3 indicates that CC3 is not allowed to use the network as the synchronization reference, i.e., the P3 / P4 / P5 level is invalid, so there is a conflict between the synchronization reference P3 of CC3 determined by the terminal and the sl-NbAsSync configuration of CC3. A possible problem with the above solution is that it only supports terminals operating on an Intelligent Transportation System (ITS) frequency band, and may not support the realization of using the network as the synchronization reference (directly / indirectly), so synchronization cannot be realized based on P3 / P4 / P5, and synchronization with a carrier that uses P3 / P4 / P5 as the synchronization reference cannot be realized.

[0045] An embodiment of the present application provides a carrier determination method, and as shown in FIG. 2, the carrier determination method according to the embodiment of the present application may include the following step 201.

[0046] Step 201: A terminal determines a second carrier and / or a third carrier from the first carriers according to first information of at least some of the first carriers.

[0047] In an embodiment of the present application, the second carrier is used to determine synchronization information of the second carrier and / or synchronization information of a fourth carrier.

[0048] In an embodiment of the present application, the multiple third carriers are used to perform sidelink SL transmission, which should be noted includes SL transmission and / or SL reception.

[0049] In an embodiment of the present application, the plurality of first carriers satisfy a first condition.

[0050] In an embodiment of the present application, the plurality of third carriers meets the second condition.

[0051] In other words, when a terminal performs SL CA or SL multi-carrier operation, these carriers need to satisfy the first condition, and / or the network must configure or pre-configure to ensure that carriers that may be used for SL CA or SL multi-carrier operation satisfy the second condition.

[0052] Optionally, in an embodiment of the present application, the synchronization information is used for transmission timing synchronization between each carrier of the CA transmission and / or the multi-carrier transmission and / or the SL transmission.

[0053] Optionally, in an embodiment of the present application, the synchronization information is: Synchronous references and Timing information, and time-frequency information.

[0054] It should be noted that a synchronization reference is a device that can provide synchronization information, and the synchronization reference types supported in the New Radio NR Sidelink (SL) system include GNSS, eNB, gNB, UE, and terminal internal clock. By using the synchronization reference of a synchronization carrier as the synchronization reference of another carrier, synchronization between carriers can be realized.

[0055] Optionally, in an embodiment of the present application, the UE may include at least one of a UE directly synchronized to a GNSS, a UE indirectly synchronized to a GNSS, a UE directly synchronized to a gNB / eNB, a UE indirectly synchronized to a gNB / eNB, and a remaining SyncRef UE.

[0056] In embodiments of the present application, the synchronization reference may be referred to as a synchronization reference source.

[0057] In an embodiment of the present application, the second carrier may include at least one of a synchronization carrier, a reference carrier, and a primary carrier.

[0058] In an embodiment of the present application, when the terminal performs SL transmission or SL multi-carrier operation or SL CA operation, it needs to ensure that some configurations between carriers (e.g., the configurations shown in the first information) are the same, or when the UE selects a synchronization carrier, it needs some configurations between carriers to be the same or different.

[0059] In an embodiment of the present application, when the terminal determines that a carrier will perform SL transmission or SL multi-carrier operation or SL CA operation, it needs to ensure that some configurations between the determined carriers (e.g., the configurations shown in the first information) are the same, or when the UE determines a synchronization carrier, it needs that some configurations between the carriers are the same or different.

[0060] Optionally, in the embodiment of the present application, the second carrier is the first carrier. In other words, according to the embodiment of the present application, after the network side device ensures that the configuration of the first carrier meets the first condition, the first carrier can be directly set as the second carrier, and the first carrier can be set as the second carrier to perform timing synchronization or SL transmission during data transmission.

[0061] Optionally, in the embodiment of the present application, the plurality of first carriers may be pre-configured, or configured by a network, or instructed by a network, or selected by a terminal.

[0062] Optionally, in an embodiment of the present application, the first condition is: At least some of the carriers have the same synchronization reference order, or at least some of the carriers have different synchronization reference orders; The synchronization reference priority indication information of at least some of the carriers is the same, or the synchronization reference priority indication information of at least some of the carriers is different; The first instruction information of at least some of the carriers is the same, or the first instruction information of at least some of the carriers is different; The HARQ configurations of at least some of the carriers are the same, or the HARQ configurations of at least some of the carriers are different; The PSFCH configurations of at least some carriers are the same, or the PSFCH configurations of at least some carriers are different; At least some of the carriers have the same SCS configuration or at least some of the carriers have different SCS configurations; The synchronization resources corresponding to at least some of the carriers are the same, or the synchronization resources corresponding to at least some of the carriers are different; and The starting symbols of at least some of the carriers are the same or the starting symbols of at least some of the carriers are different; The number of occupied symbols of at least some of the carriers is the same, or the number of occupied symbols of at least some of the carriers is different.

[0063] Optionally, in the embodiment of the present application, the second condition is: The synchronization reference order of at least some of the carriers is the same; and The synchronization reference priority indication information of at least some of the carriers is the same; and The first instruction information of at least some of the carriers is the same; The HARQ configurations of at least some of the carriers are the same; and The PSFCH configurations of at least some of the carriers are the same; and At least some carriers have the same SCS configuration, The synchronization resources corresponding to at least some of the carriers are the same; and At least some of the carriers have the same starting symbol, and the number of occupied symbols of at least some of the carriers is the same.

[0064] Exemplarily, the synchronization reference order of at least some of the carriers being the same includes that at least some of the carriers have the same synchronization reference order, or that at least some of the carriers have a specific synchronization reference order.

[0065] Exemplarily, the different synchronization reference orders of at least some of the carriers include at least some of the carriers having different synchronization reference orders.

[0066] Exemplarily, the synchronization reference priority indication information of at least some of the carriers being the same includes that at least some of the carriers have the same synchronization reference priority indication information, or that at least some have specific synchronization reference priority indication information.

[0067] Exemplarily, the first instruction information of at least some of the carriers being the same includes that at least some of the carriers have the same first instruction information, or that at least some have specific first instruction information.

[0068] Exemplarily, the synchronization reference priority indication information or the first indication information of at least some of the carriers being different includes that at least some of the carriers have different synchronization reference priority indication information or first indication information.

[0069] Exemplarily, the HARQ configurations of at least some of the carriers being the same include: at least some of the carriers having the same HARQ configuration, or at least some of the carriers having a specific HARQ configuration.

[0070] Exemplarily, the PSFCH configurations of at least some carriers being the same include: at least some carriers having the same PSFCH configuration, or at least some carriers having a specific PSFCH configuration.

[0071] Exemplarily, the SCS configurations of at least some of the carriers being the same include at least some of the carriers having the same SCS configuration, or at least some of the carriers having a specific SCS configuration.

[0072] Illustratively, the HARQ configurations of at least some of the carriers are different include that at least some of the carriers have different HARQ configurations.

[0073] Exemplarily, the PSFCH configurations of at least some of the carriers are different include that at least some of the carriers have different PSFCH configurations.

[0074] Illustratively, the SCS configurations of at least some of the carriers being different include at least some of the carriers having different SCS configurations.

[0075] Exemplarily, the synchronization resources (e.g., configured or pre-configured synchronization resources) corresponding to at least some of the carriers being the same includes at least some of the carriers corresponding to the same synchronization resources or at least some of the carriers corresponding to specific synchronization resources.

[0076] Optionally, in an embodiment of the present application, the third carrier is a carrier in a second carrier set; a carrier in the third carrier set; All carriers that can be used for carrier aggregation CA transmission; The carriers actually used for CA transmission, The carriers that were once selected for CA transmission, All carriers that can be used in multicarrier transmission; Carriers actually used in multicarrier transmission, The carriers that were once selected for multi-carrier transmission, All carriers that can be used for SL transmission; The carriers actually used for SL transmission, The carriers once selected for SL transmission, and a carrier including synchronization resources; Here, the second carrier set includes carriers that can be used as synchronization carriers, and the third carrier set includes a set of available synchronization carriers.

[0077] For example, the third carrier may be a carrier of at least a portion of each of the items, or may be a carrier of at least a portion of the multiple items, or may be a product of the multiple items, or may be a subset of the product of the multiple items.

[0078] Exemplarily, the third carrier may be some of the carriers in the second carrier set, or some of the carriers in the third carrier set, or some of the carriers in the second carrier set and some of the carriers in the third carrier set, or the same carrier in the second carrier set and the third carrier set, i.e., the intersection of the second carrier set and the third carrier set.

[0079] It should be noted that the above is described by taking the second carrier aggregation and the third carrier aggregation as examples.

[0080] Optionally, in an embodiment of the present application, the terminal may determine time-frequency information of the third carrier based on the synchronization information of the second carrier.

[0081] In one possible example, the terminal may take the synchronization information of the second carrier as the synchronization information of the third carrier. Illustratively, the terminal takes the synchronization reference of the second carrier as the synchronization reference of the third carrier.

[0082] In one possible example, the terminal derives synchronization information for the third carrier based on the synchronization information for the second carrier. Illustratively, the terminal derives time-frequency information for the third carrier based on the synchronization reference of the second carrier.

[0083] Optionally, in an embodiment of the present application, the first information is: Synchronous reference order; Synchronous reference priority indication information; A first instruction; HARQ configuration; PSFCH configuration; SCS configuration and The included synchronization resource; A start symbol, and the number of occupied symbols.

[0084] Exemplarily, the first instruction information is: Whether at least one specific synchronization reference needs to be monitored, Whether at least one particular synchronous reference needs to be skipped, It is used to indicate at least one of: whether to synchronize directly or indirectly to at least one particular synchronization reference.

[0085] Exemplarily, the HARQ configuration is used to indicate whether HARQ is enabled.

[0086] Exemplarily, the PSFCH configuration includes at least one of a periodicity of the PSFCH, a time domain position of the PSFCH, a frequency domain position of the PSFCH, configuration information indicating whether to configure a PSFCH resource, and a minimum interval between data and a corresponding PSFCH for feeding back the data.

[0087] Exemplarily, the minimum interval between the data and the corresponding PSFCH for feeding back the data may be 2 or 3.

[0088] Exemplarily, the synchronization resource includes at least one of a period of a synchronization signal, a number of synchronization slots within the period of the synchronization signal, a repetition number of the synchronization signal, a synchronization slot offset amount, a time interval of the synchronization signal, and an SCS.

[0089] Exemplarily, the SCS includes at least one of an SCS of a synchronization signal and an SCS of a carrier.

[0090] Exemplarily, the synchronization resource corresponding to the carrier may include a synchronization resource with which the carrier is configured, or a synchronization resource with which the carrier is pre-configured.

[0091] Exemplarily, the starting symbol may be a starting symbol of a sidelink.

[0092] Exemplarily, the number of occupied symbols may be the number of occupied symbols of a sidelink.

[0093] Optionally, in the embodiment of the present application, the first information may be configured by the network side, or indicated by the network side, or pre-configured.

[0094] In one possible example, the third carriers satisfying the second condition include: The synchronization reference order of at least some of the multiple third carriers is the same; and The synchronization reference priority indication information of at least some of the multiple third carriers is the same; and The first instruction information of at least some of the third carriers is the same; and The HARQ configurations of at least some of the third carriers are the same; and The PSFCH configurations of at least some of the third carriers are the same; The SCS configurations of at least some of the third carriers are the same; and Synchronization resources corresponding to at least some of the third carriers are the same; and The start symbols of at least some of the third carriers are the same; and and the number of occupied symbols of at least some of the third carriers is the same.

[0095] In one possible example, the first carriers satisfying a first condition include: At least some of the first carriers have the same synchronization reference order, or at least some of the first carriers have different synchronization reference orders; The synchronization reference priority indication information of at least some of the plurality of first carriers is the same, or the synchronization reference priority indication information of at least some of the plurality of first carriers is different; The first instruction information of at least some of the first carriers is the same, or the first instruction information of at least some of the first carriers is different; The HARQ configurations of at least some of the first carriers are the same, or the HARQ configurations of at least some of the first carriers are different; The PSFCH configurations of at least some of the first carriers are the same, or the PSFCH configurations of at least some of the first carriers are different; At least some of the first carriers have the same SCS configuration, or at least some of the first carriers have different SCS configurations; The synchronization resources corresponding to at least some of the plurality of first carriers are the same, or the synchronization resources corresponding to at least some of the plurality of first carriers are different; The starting symbols of at least some of the first carriers are the same, or the starting symbols of at least some of the first carriers are different; This may include at least one of the following: the number of occupied symbols of at least some of the multiple first carriers is the same; or the number of occupied symbols of at least some of the multiple first carriers is different.

[0096] Optionally, in an embodiment of the present application, the plurality of first carriers include: A plurality of carriers used for CA transmission; A plurality of carriers used in multicarrier transmission; a plurality of first carriers used for SL transmission; a first carrier set; a second carrier set (e.g., setA); and and a third carrier set (eg, set B).

[0097] Exemplarily, the first carrier set in this specification is a carrier in a second carrier set; a carrier in the third carrier set; All carriers that can be used for carrier aggregation CA transmission; The carriers actually used for CA transmission, The carriers that were once selected for CA transmission, All carriers that can be used in multicarrier transmission; Carriers actually used in multicarrier transmission, The carriers that were once selected for multi-carrier transmission, All carriers that can be used for SL transmission; The carriers actually used for SL transmission, The carriers once selected for SL transmission, and a carrier that includes synchronization resources.

[0098] For example, the carriers in the first carrier set may be all or a part of any one of the carriers, or may be all or a part of the carriers of any of the plurality of items, or may be the same carrier among the carriers of any of the plurality of items, or may be a part of the same carrier among the carriers of any of the plurality of items.

[0099] As can be understood, each of the above items for determining the first carrier set may be considered as one carrier set, and the first carrier set may be any one of the plurality of carrier sets, or any plurality of the carrier sets, or a subset of any one of the carrier sets, or a subset of any plurality of the carrier sets, or a intersection of any plurality of the carrier sets, or a subset of the intersection of any plurality of the carrier sets.

[0100] For example, the plurality of carriers in the first carrier set may include all carriers in Set A, Further, for example, the plurality of carriers in the first carrier set may include some carriers in Set A and some carriers in Set B; For example, the plurality of carriers in the first carrier set may include some of the carriers included in Set A among the carriers used for CA transmission, For example, the plurality of carriers in the first carrier set may include some carriers among all carriers that can be used for CA transmission and that are configured as synchronization resources, Also for example, the plurality of carriers in the first carrier set may include carriers that are configured as synchronization resources and have been previously selected for SL transmission among all carriers available for SL transmission.

[0101] It should be noted that the CA transmission in this specification may be SL CA transmission, and the multi-carrier transmission may be SL multi-carrier transmission.

[0102] Optionally, in the embodiment of the present application, in the above step 201, "the terminal determines a second carrier from a plurality of first carriers" may include the following step 201a.

[0103] Step 201a: The terminal determines a second carrier from a plurality of first carriers according to a first rule.

[0104] In some possible embodiments, the first rule is: determining a second carrier based on the selection priority; determining a carrier whose signal quality satisfies a first condition as a second carrier; determining a carrier whose searched time satisfies a second condition as a second carrier; determining a carrier whose synchronization reference type priority satisfies a third condition as a second carrier; determining a carrier on which a HARQ configuration is enabled or not enabled as a second carrier; determining a carrier whose period of the PSFCH configuration satisfies a fourth condition as a second carrier; determining a carrier that satisfies a fifth condition as a second carrier by the resource pool; determining a carrier whose second priority satisfies the sixth condition as a second carrier; and determining, as the second carrier, a carrier whose synchronization resource satisfies a seventh condition.

[0105] Exemplarily, the second priority is: A priority or priority group of the synchronization reference; Service priority and and a priority of the synchronization resource.

[0106] Exemplarily, the synchronization resource includes: The period of the synchronization signal; the number of synchronization slots within the period of the synchronization signal; The number of repetitions of the synchronization signal; A synchronous slot offset amount; the time interval of the synchronization signal; and SCS, Here, the SCS includes at least one of an S-SSB SCS and a carrier SCS.

[0107] In some possible embodiments, the carrier that satisfies the first condition is: The carrier with the strongest signal, The carrier with the weakest signal strength, and a carrier having a signal strength at a first threshold.

[0108] In some possible embodiments, the carrier that satisfies the second condition is: The carrier with the earliest search time, The carrier with the latest search time, and a carrier where the searched time is a predetermined time.

[0109] In some possible embodiments, the carrier that satisfies the third condition is: The carrier with the highest priority for the synchronization reference type; The carrier with the lowest synchronization reference type priority; and a carrier whose synchronization reference type priority is a predetermined synchronization reference priority.

[0110] In some possible embodiments, the carrier that satisfies the fourth condition is: The carrier with the largest period of the PSFCH configuration, The carrier with the smallest period of the PSFCH configuration, and a carrier in which the period of the PSFCH configuration is a first predetermined period.

[0111] In some possible embodiments, the carrier that satisfies the fifth condition above is: a carrier including at least one resource pool having a PSFCH resource; A carrier including at least one resource pool that does not have a PSFCH resource; A carrier including a resource pool in which no PSFCH resource is present; and a carrier that includes a resource pool having PSFCH resources.

[0112] In some possible embodiments, the carrier that satisfies the sixth condition is: The carrier with the highest priority, The carrier with the lowest priority, and a carrier having a predetermined priority.

[0113] In some possible embodiments, the carrier that satisfies the seventh condition is: The carrier with the largest period of the synchronization signal, The carrier with the smallest period of the synchronization signal, a carrier having a synchronization signal with a second predetermined period; The carrier with the largest number of synchronous slots in a period, The carrier with the smallest number of synchronization slots in a period, A carrier having a predetermined number of synchronous slots in a period; The carrier with the highest number of repetitions of the synchronization signal, The carrier with the smallest number of repetitions of the synchronization signal; a carrier having a synchronization signal repetition number of a predetermined number; The carrier with the largest synchronous slot offset, The carrier with the smallest synchronous slot offset, A carrier having a synchronous slot offset of a predetermined offset amount; The carrier with the largest time interval between synchronization signals, A carrier having a synchronization signal with a predetermined time interval; The carrier with the largest SCS and The carrier with the smallest SCS and and a carrier, the SCS being a given SCS.

[0114] In some possible embodiments, the selection priority is: Selection priority relations; and a selection priority order; Here, the selection priority relationship includes a mapping relationship between at least one selection priority and at least one carrier, and the selection priority order is the at least one selection priority order.

[0115] It should be noted that the selection priority may be a selection priority group, that is, the selection priority may include multiple selection priorities, and the selection priority may include multiple carriers.

[0116] Exemplarily, the selection priority relationship may be a selection priority mapping table.

[0117] Exemplarily, the at least one selection priority may be one or more selection priority groups.

[0118] Illustratively, the selection priority order is obtained by sorting in any order or in a specific order, such as from high to low, from low to high, or in a specific order.

[0119] Illustratively, the selection priority order may be dictated by a protocol.

[0120] It should be explained that the at least one carrier is at least one carrier included in a selection priority, or at least one carrier corresponding to a selection priority, or at least one carrier under the selection priority.

[0121] Exemplarily, the process in which the terminal determines the second carrier based on the selection priority order may include the terminal sorting the multiple first carriers based on the selection priority order, and determining at least one carrier having the highest selection priority as the second carrier.

[0122] In some possible embodiments, determining the second carrier based on the selection priority described above includes: determining a carrier having the highest selection priority as a second carrier; determining a carrier having a selection priority higher than a first predetermined selection priority as a second carrier; determining a carrier having the lowest selection priority as a second carrier; determining a carrier having a selection priority lower than a second predetermined selection priority as a second carrier; determining a carrier having a third selection priority as the second carrier.

[0123] Exemplarily, the method for the terminal to determine the second carrier (i.e., the method for the terminal to select the synchronization carrier) includes at least one of the following: a1) determining a second carrier based on a selection priority order; a2) determining a carrier having the highest selection priority or higher than a first threshold as a second carrier; a3) determining a carrier having the lowest selection priority or lower than the first threshold as a second carrier; a4) determining a carrier having a selection priority of a particular selection priority as a second carrier; For example, the above a1) to a4) are 1) Synchronization reference priority indication information and / or first indication information of at least some carriers in an aggregated carrier / multiple carriers / at least two carriers / Set A / Set B / first carrier set; 2) A synchronization reference order of at least some carriers in an aggregated carrier / multiple carriers / at least two carriers / Set A / Set B / first carrier set; 3) A HARQ configuration of at least some carriers in an aggregated carrier / multiple carriers / at least two carriers / Set A / Set B / first carrier set; 4) PSFCH configuration of at least some carriers in the aggregation carrier / multiple carriers / at least two carriers / Set A / Set B / first carrier set; 5) an SCS configuration of at least some carriers in an aggregated carrier / multiple carriers / at least two carriers / Set A / Set B / first carrier set; 6) Obtained based on at least one of an aggregated carrier / multiple carriers / at least two carriers / Set A / Set B / synchronization resources corresponding to at least some carriers in the first carrier set.

[0124] a5) determining the carrier with the highest second priority as the second carrier; a6) determining the carrier with the lowest second priority as the second carrier; a7) determining as a second carrier a carrier whose second priority is a particular priority; a8) determining the carrier with the highest RSRP strength as the second carrier; a9) determining the carrier with the lowest RSRP strength as the second carrier; a10) determining a carrier having a specific value of RSRP strength as a second carrier; a11) determining the carrier with the earliest search time as the second carrier; a12) determining the carrier whose search time is the latest as the second carrier; a13) determining a carrier whose searched time has a specific value as a second carrier; a14) determining a carrier having a synchronization reference of a particular type as a second carrier; For example, the above a5) to a14) are 1) A synchronization reference order of at least some carriers in an aggregated carrier / multiple carriers / at least two carriers / Set A / Set B / at least some carriers in a first carrier set; 2) A synchronization reference order of at least some carriers in an aggregated carrier / multiple carriers / at least two carriers / Set A / Set B / at least some carriers in a first carrier set; 3) Obtained based on at least one of: aggregation carrier / multiple carriers / at least two carriers / Set A / Set B / synchronization reference priority indication information of at least some carriers in at least some carriers in a first carrier set / first information.

[0125] a15) determining a carrier on which a HARQ configuration is enabled as a second carrier; a16) determining a carrier on which a HARQ configuration is not enabled as a second carrier; a17) determining a carrier having the largest period of the PSFCH configuration as a second carrier; a18) determining a carrier having the smallest period of the PSFCH configuration as a second carrier; a19) determining a carrier having a specific PSFCH period as a second carrier; a20) determining a carrier including at least one resource pool having a PSFCH resource as a second carrier; a21) determining a carrier including at least one resource pool that does not have a PSFCH resource as a second carrier; a22) determining a carrier including a resource pool in which no PSFCH resource is present as a second carrier; a23) determining a carrier including a resource pool having PSFCH resources as a second carrier; a24) Determine the carrier with the largest SCS as the second carrier; a25) Determine the carrier with the smallest SCS as the second carrier; a26) determining a carrier having a specific SCS value as a second carrier; For example, the above a15) to a26) are 1) Obtained based on at least one of HARQ / PSFCH / SCS configurations of aggregated carriers / multiple carriers / at least two carriers / Set A / Set B / at least some carriers in a first carrier set.

[0126] a27) determining the carrier having the largest period of the synchronization signal as the second carrier; a28) determining the carrier having the smallest period of the synchronization signal as the second carrier; a29) determining a carrier having a synchronization signal period of a specific value as a second carrier; a30) determining the carrier with the largest number of synchronization slots in the period as the second carrier; a31) determining the carrier with the smallest number of synchronization slots in the period as the second carrier; a32) determining a carrier having a specific number of synchronization slots in a period as a second carrier; a33) Determine the carrier with the largest number of S-SSB repetitions as the second carrier; a34) Determine the carrier with the smallest S-SSB repetition number as the second carrier; a35) determining a carrier having a specific value of S-SSB repetition number as a second carrier; a36) determining the carrier with the largest synchronous slot offset as the second carrier; a37) determining the carrier with the smallest synchronous slot offset as the second carrier; a38) determining a carrier having a synchronous slot offset amount of a specific value as a second carrier; a39) determining the carrier with the largest S-SSB time interval as the second carrier; a40) determining a carrier having a specific S-SSB time interval as a second carrier; For example, the above a27) to a40) are 1) Obtained based on at least one of (e.g., configured or pre-configured) synchronization resources corresponding to at least some carriers in an aggregated carrier / multiple carriers / at least two carriers / Set A / Set B / first carrier set.

[0127] In some possible embodiments, the selection priority is: The Protocol provides for: A network comprising: A pre-configured Instructed by the network; Synchronous reference priority indication information; A first instruction; Synchronous reference order; A synchronous reference type, A synchronization parameter configuration method; The second priority, HARQ configuration; PSFCH configuration; SCS configuration and Synchronization resources; A carrier frequency point; The carrier index is determined based on at least one of the above.

[0128] As can be appreciated, the carriers to be included in the selection priority can be determined based on at least one of the above.

[0129] In some possible embodiments, the selection priority order is: Synchronous reference priority indication information; A first instruction; Synchronous reference order; A synchronous reference type, A synchronization parameter configuration method; The second priority, HARQ configuration; PSFCH configuration; SCS configuration and Synchronization resources; A carrier frequency point; The carrier index is determined based on at least one of the above.

[0130] Exemplarily, the synchronization reference priority indication information may be sl-NbAsSync.

[0131] Exemplarily, the first instruction information is: Whether at least one specific synchronization reference needs to be monitored, Whether at least one particular synchronous reference needs to be skipped, It is used to indicate at least one of: whether to synchronize directly or indirectly to at least one particular synchronization reference.

[0132] Exemplarily, the above synchronous reference order is: an order of priorities or priority groups corresponding to the synchronization references; The priority order of the services; A priority order of the synchronization resources; A signal strength order (e.g., Reference Signal Received Strength RSRP strength order), and the order before and after the searched time.

[0133] Exemplarily, the synchronization reference types include at least one of a gNB, an eNB, a GNSS, a UE, and a UE internal clock.

[0134] Exemplarily, the synchronization parameter configuration manner includes at least one of network-configuration and pre-configuration.

[0135] Exemplarily, the second priority is: The priority or priority group of the synchronization reference; Service priority and and a priority of the synchronization resource.

[0136] For example, the priority of the synchronization resource may be 1-8 or 0-7.

[0137] Exemplarily, this HARQ configuration is used to indicate whether HARQ is enabled.

[0138] Exemplarily, the PSFCH configuration includes at least one of a periodicity of the PSFCH, a time domain location of the PSFCH, a frequency domain location of the PSFCH, configuration information indicating whether to configure a PSFCH resource, and a minimum interval between data and a corresponding PSFCH for feeding back the data.

[0139] Exemplarily, the synchronization resource includes: The period of the synchronization signal; the number of synchronization slots within the period of the synchronization signal; The number of repetitions of the synchronization signal; A synchronous slot offset amount; the time interval of the synchronization signal; and SCS, Here, the SCS includes at least one of an S-SSB SCS and a carrier SCS.

[0140] For illustrative purposes, two examples are given below to illustrate and explain determining selection priority based on synchronization reference type.

[0141] Example 1: Determining a carrier to be included in a selection priority based on a synchronization reference type, or determining a mapping relationship between at least one selection priority and at least one carrier based on a synchronization reference type, Determining a carrier whose synchronization reference is gNB / eNB as a carrier under selection priority; Determining a carrier whose synchronization reference is a UE that is directly synchronized to a gNB / eNB as a carrier under selection priority; Determining a carrier whose synchronization reference is a UE that indirectly synchronizes to a gNB / eNB as a carrier under selection priority; determining a carrier whose synchronization reference is GNSS as a carrier under selection priority; determining a carrier whose synchronization reference is a UE directly synchronized to a GNSS as a carrier under selection priority; determining a carrier whose synchronization reference is a UE indirectly synchronized to a GNSS as a carrier under selection priority; and determining a carrier whose synchronization reference is the remaining UE as the carrier under selection priority.

[0142] Example 2: Determining the carriers included in the selection priority based on the synchronization reference type, or determining the mapping relationship between at least one selection priority and at least one carrier based on the synchronization reference type, Determine a carrier whose synchronization reference is SyncRef UE, whose SLSS ID belongs to a set / part of a set of SLSS IDs defined in the coverage, and whose coverage indication parameter indicates that the carrier is true, as a carrier under the selection priority; determining a carrier whose synchronization reference is SyncRef UE, whose SLSS ID belongs to a SLSS ID set / partial set defined in the coverage, and whose coverage indication parameter indicates that the carrier is false, as a carrier under the selection priority; Determine a carrier, in which the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the coverage indication reference indicates that the carrier is true / the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the SLSS is transmitted on the third set of synchronization resources, as a carrier under the selection priority; Determine a carrier whose synchronization reference is SyncRef UE, and whose SLSS ID is 0, and whose SLSS is not transmitted on the third set of synchronization resources, and whose coverage indication parameter is indicated as false, as a carrier under selection priority; determining a carrier whose synchronization reference is SyncRef UE, whose SLSS ID is 337, and whose coverage indication parameter is indicated as false, as a carrier with a lower selection priority; and determining a carrier whose synchronization reference is another SyncRef UE as a carrier under selection priority.

[0143] Example 3: The first selection priority above is: 1) Synchronization reference priority indication information for at least a part of a plurality of carriers; 2) first indication information of at least some of the carriers; and 3) A synchronization reference order of at least some of the multiple carriers; and 4) HARQ configurations of at least some of the carriers; and 5) A PSFCH configuration of at least some of the carriers among the plurality of carriers; 6) SCS configurations of at least some of the carriers; and 7) A PSFCH configuration of at least some of the carriers among the plurality of carriers; 8) SCS configurations of at least some of the carriers; and 9) Synchronization resources included (e.g., configured or pre-configured) in at least some of the carriers; 10) A synchronization reference priority type of at least some of the multiple carriers; 11) A synchronization reference type for at least some of the carriers; and 12) a second preference of at least some of the carriers; and 13) The synchronization parameter configuration method of at least some of the multiple carriers may be determined based on at least one of the following:

[0144] For example, when determining the selection priority based on the second priority, a carrier whose synchronization reference priority is a certain (several) value is determined as a carrier under the selection priority, and / or a carrier whose service priority is a certain (several) value is determined as a carrier under the selection priority, and / or a carrier whose synchronization resource priority is a certain (several) value is determined as a carrier under the selection priority.

[0145] Furthermore, the selection priority may be determined based on a synchronization reference order of at least some of the multiple carriers (including at least one of the multiple carriers of the aggregation carrier, the multi-carrier, at least some of the carriers of the at least two carriers, at least some of the carriers in Set A, at least some of the carriers in Set B, and at least some of the carriers in the first carrier set).

[0146] For example, when determining the selection priority based on the HARQ / PSFCH / SCS configuration, a carrier for which the HARQ / PSFCH / SCS configuration is a certain (several) parameter may be determined as a carrier with a lower selection priority.

[0147] Exemplarily, when the selection priority is determined based on the carrier frequency point, a carrier whose carrier frequency point has a certain (several) value is determined as a carrier with a lower selection priority.

[0148] For example, when the selection priority is determined based on the carrier index, a carrier whose carrier index has a certain (several) value is determined as a carrier with a lower selection priority.

[0149] Exemplarily, when determining the selection priority based on the synchronization resource, a carrier whose synchronization resource is a certain (several) value is determined as a carrier under the selection priority. For example, a carrier whose synchronization signal period is a certain (several) value, a carrier whose synchronization slot number in the period is a certain (several) value, and / or a carrier whose S-SSB repetition number is a certain (several) value, and / or a synchronization slot offset amount is a certain (several) value, and / or a carrier whose S-SSB time interval is a certain (several) value, and / or a carrier whose SCS of the S-SSB is a certain (several) value are determined as a carrier under the selection priority.

[0150] Furthermore, the selection priority may be determined based on synchronization resources of at least some of the multiple carriers (including at least one of the multiple carriers of the aggregation carrier, the multi-carrier, at least some of the carriers of the at least two carriers, at least some of the carriers in Set A, at least some of the carriers in Set B, and at least some of the carriers in the first carrier set).

[0151] Exemplarily, when the selection priority includes a carrier whose synchronization reference is of some synchronization reference type, the at least one carrier is: A carrier whose synchronization reference is gNB / eNB; A carrier whose synchronization reference is a UE that directly synchronizes to a gNB / eNB; A carrier whose synchronization reference is a UE that indirectly synchronizes to a gNB / eNB; A carrier whose synchronization reference is GNSS; a carrier whose synchronization reference is a UE directly synchronized to a GNSS; a carrier whose synchronization reference is a UE indirectly synchronized to GNSS; The synchronization reference includes at least one of the carriers that are the remaining UEs.

[0152] Exemplarily, when determining at least one carrier based on a synchronization reference type, the at least one carrier may be: A carrier, the synchronization reference being a first synchronization reference type, and the bypass synchronization signal SLSS identifier ID of the first synchronization reference type belonging to a first SLSS ID set, and the coverage indication parameter indicating third information; A carrier, the synchronization reference being a first synchronization reference type, and the SLSS ID of the first synchronization reference type belonging to a first SLSS ID set, and the coverage indication parameter indicating fourth information; A carrier, in which the synchronization reference is a first synchronization reference type, the SLSS ID of the first synchronization reference type is a first SLSS ID, and the coverage indication reference indicates third information; A carrier in which a synchronization reference is a first synchronization reference type, and an SLSS ID of the first synchronization reference type is the first SLSS ID, and an SLSS of the synchronization reference is transmitted on a first synchronization resource; A carrier, in which the synchronization reference is a first synchronization reference type, and the SLSS ID of the first synchronization reference type is the first SLSS ID, and the SLSS of the synchronization reference is not transmitted on the first synchronization resource, and the coverage indication parameter indicates fourth information; The synchronization reference may include at least one of: the synchronization reference is a first synchronization reference type; the SLSS ID of the first synchronization reference type is a second SLSS ID; and the coverage indication parameter indicates a carrier indicating the fourth information.

[0153] Exemplarily, the first synchronization reference type includes one of a UE, a gNB, an eNB, a GNSS, and a UE internal clock. Exemplarily, the first SLSS ID set includes at least a part of an SLSS ID set defined within a carrier coverage. Exemplarily, the first synchronization resource includes a third set of synchronization resources agreed upon by a protocol. Exemplarily, the third information and the fourth information may be status indication information, for example, indicated to be true and indicated to be false.

[0154] For example, the UEs may include at least one of UEs that are directly synchronized to the GNSS, UEs that are indirectly synchronized to the GNSS, UEs that are directly synchronized to the gNB / eNB, UEs that are indirectly synchronized to the gNB / eNB, and remaining Sync UEs.

[0155] Illustratively, taking the synchronization reference type as an example, the at least one carrier includes: A carrier whose synchronization reference is gNB / eNB; A carrier whose synchronization reference is GNSS; A carrier whose synchronization reference is SyncRef UE, and whose SLSS ID of SyncRef UE belongs to a SLSS ID set / partial set defined in coverage, and whose coverage indication parameter indicates true; A carrier whose synchronization reference is SyncRef UE, and whose SLSS ID of SyncRef UE belongs to a SLSS ID set / partial set defined in the coverage, and whose coverage indication parameter indicates false; A carrier, the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the coverage indication reference indicates that the carrier is true / the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the SLSS is transmitted on a third set of synchronization resources; A carrier, the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the SLSS is not transmitted on the third set of synchronization resources, and the coverage indication parameter indicates false; The synchronization reference may include at least one of: SyncRef UE, and the SLSS ID of SyncRef UE is 337, and the carrier is indicated to be false by the coverage indication parameter.

[0156] Exemplarily, when determining at least one carrier based on the second priority, the at least one carrier may be a carrier whose priority is a certain (several) value, for example, a carrier whose synchronization reference priority is a certain (several) value, a carrier whose service priority is a certain (several) value, or a carrier whose synchronization resource priority is a certain (several) value.

[0157] Exemplarily, when determining the at least one carrier based on a carrier frequency point, the at least one carrier may be a carrier whose carrier frequency point is a certain (several) value.

[0158] Exemplarily, when determining the at least one carrier based on a carrier index, the at least one carrier may be a carrier whose carrier index is a certain (several) value.

[0159] Exemplarily, when at least one carrier is determined based on a synchronization resource, the at least one carrier may be a carrier whose synchronization resource is a certain (several) value, such as a carrier whose period of a synchronization signal is a certain (several) value, a carrier whose number of synchronization slots in a period is a certain (several) value, a carrier whose repetition number of S-SSB is a certain (several) value, a carrier whose synchronization slot offset amount is a certain (several) value, a carrier whose time interval of S-SSB is a certain (several) value, and a carrier whose SCS of S-SSB is a certain (several) value.

[0160] In some possible embodiments, the selection priority order is: A carrier synchronization reference order; When the synchronization reference order of the carrier includes an overlapping portion, a synchronization reference order corresponding to the overlapping portion; When the synchronization reference order of the carrier includes an overlapping portion, a synchronization reference order corresponding to a non-overlapping portion other than the overlapping portion; The carrier arrangement order is determined based on at least one of the above.

[0161] In some possible embodiments, the selection priority order is: A selection priority corresponding to a carrier having a high synchronization reference priority is higher than a selection priority corresponding to a carrier having a low synchronization reference priority, or is lower than a selection priority corresponding to a carrier having a low synchronization reference priority; The synchronization reference priority order of the carriers includes an overlapping portion, and a selection priority corresponding to a carrier having a high synchronization reference priority in the overlapping portion is higher than a selection priority corresponding to a carrier having a low synchronization reference priority in the overlapping portion, or is lower than a selection priority corresponding to a carrier having a low synchronization reference priority in the overlapping portion; The synchronization reference priority order of carriers includes an overlapping portion, and the selection priority corresponding to a carrier having a high synchronization reference priority in the non-overlapping portion other than the overlapping portion is higher than the selection priority corresponding to a carrier having a low synchronization reference priority in the non-overlapping portion, or is lower than the selection priority corresponding to a carrier having a low synchronization reference priority in the non-overlapping portion.

[0162] Exemplarily, the above-mentioned synchronization reference priority order may be a priority order or a priority sequence of synchronization reference priorities.

[0163] In some possible embodiments, the selection priority order is: A selection priority corresponding to a carrier having a high synchronization reference procedure is higher than a selection priority corresponding to a carrier having a low synchronization reference procedure, or is lower than a selection priority corresponding to a carrier having a low synchronization reference procedure; The synchronization reference order of the carriers includes an overlapping portion, and the selection priority corresponding to the carrier having a high synchronization reference procedure in the overlapping portion is higher than the selection priority corresponding to the carrier having a low synchronization reference procedure in the overlapping portion, or is lower than the selection priority corresponding to the carrier having a low synchronization reference procedure in the overlapping portion; The synchronization reference order of the carriers includes an overlapping portion, and the selection priority corresponding to a carrier having a high synchronization reference procedure in the non-overlapping portion other than the overlapping portion is higher than the selection priority corresponding to a carrier having a low synchronization reference procedure in the non-overlapping portion, or the selection priority corresponding to a carrier having a low synchronization reference procedure in the non-overlapping portion is lower than the selection priority corresponding to a carrier having a low synchronization reference procedure in the non-overlapping portion.

[0164] In some possible embodiments, the overlapping portion of the synchronization reference priority order is: Synchronous reference priority indication information; A first instruction; predefined by the protocol; A network comprising: Instructed by the network; The determination may be based on at least one of the following:

[0165] Here, the first instruction information is Whether at least one specific synchronization reference needs to be monitored, Whether at least one particular synchronous reference needs to be skipped, It is used to indicate at least one of: whether to synchronize directly or indirectly to at least one particular synchronization reference.

[0166] For example, when the synchronization reference priority indication information and / or the first indication information of at least some of the multiple carriers are different, the synchronization reference priority orders corresponding to at least some of the multiple carriers are different.

[0167] It should be noted that the synchronization reference priorities corresponding to different priority indication information are referred to above and will not be further described here.

[0168] In some possible embodiments, the selection priority order is obtained by sorting a number of selection priorities in an arbitrary / specific order.

[0169] The process of determining the selection priority will be explained below with a number of examples.

[0170] In a possible example of the first kind, For scenarios where the synchronization reference order is different, the method for determining the selection priority is as follows:

[0171] Exemplarily, when the synchronization reference orders of multiple carriers are different, the selection priority may be determined by at least one of the following:

[0172] b1) The selection priority corresponding to a carrier with a higher synchronization reference procedure is higher or lower than the selection priority corresponding to a carrier with a lower synchronization reference procedure.

[0173] b2) There is an overlap in the synchronization reference orders of multiple carriers, and the selection priority corresponding to a carrier with a higher synchronization reference procedure in the overlap is higher or lower than the selection priority corresponding to a carrier with a lower synchronization reference procedure.

[0174] Example 4: (Definition of overlapping portion) The overlapping portion of the synchronization reference order is determined based on the synchronization reference order of at least one carrier.

[0175] For example, taking carrier 1 and carrier 2 as an example, the synchronization reference priority orders corresponding to carrier 1 and carrier 2 are different.

[0176] For example, the synchronization reference priority order (synchronization reference priority a1 to synchronization reference priority a6) of the synchronization reference of carrier 1 is as follows:

[0177] Synchronization reference priority a1: UE directly synchronized to GNSS Synchronization reference priority a2: UE indirectly synchronized to GNSS Synchronous reference priority a3:gNB / eNB Synchronization reference priority a4: UE directly synchronized to gNB / eNB Synchronization reference priority a5: UE indirectly synchronized to gNB / eNB Synchronization reference priority a6: Remaining UE The synchronization reference priority order (synchronization reference priority b1 to synchronization reference priority b3) for the synchronization reference of carrier 2 is as follows.

[0178] Synchronization reference priority b1: UE directly synchronized to GNSS Synchronization reference priority b2: UE indirectly synchronized to GNSS Synchronization reference priority b3: remaining UE It should be noted that the synchronization reference priorities of carrier 1 are, in order of decreasing order, synchronization reference priority a1, synchronization reference priority a2, synchronization reference priority a3, synchronization reference priority a4, synchronization reference priority a5, and synchronization reference priority a6, and the synchronization reference priorities of carrier 2 are, in order of decreasing order, synchronization reference priority b1, synchronization reference priority b2, and synchronization reference priority b3.

[0179] It should be noted that the overlapping part of the synchronization reference priorities between carrier 1 and carrier 2 includes three synchronization reference priorities: UEs that are directly synchronized to GNSS, UEs that are indirectly synchronized to GNSS, and the remaining UEs.

[0180] It should be noted that "a1" to "a6" in the synchronization reference priority a1 to synchronization reference priority a6 are used to distinguish different synchronization reference priorities, and the numbers "1" to "6" in the synchronization reference priority a1 to synchronization reference priority a6 may be used to characterize high and low synchronization reference priorities, i.e., the smaller the number, the higher the synchronization reference selection priority represented. The same applies to synchronization reference priority b1 to synchronization reference priority b3.

[0181] Example 5: Synchronous reference order overlap is protocol predefined, network configured, network directed, and preconfigured.

[0182] b3) There is an overlapping portion in the synchronization reference sequence, and the selection priority corresponding to a carrier having a higher synchronization reference sequence in the non-overlapping portion is higher or lower than the selection priority corresponding to a carrier having a lower synchronization reference sequence.

[0183] Example 6: (Definition of Non-overlapping Part) The non-overlapping part of the synchronization reference order is determined based on the synchronization reference orders of multiple carriers.

[0184] For example, taking carrier 1 and carrier 2 as an example, the synchronization reference priority orders corresponding to carrier 1 and carrier 2 are different.

[0185] Linking carrier 1 and carrier 2 above, it should be noted that, as can be seen from the synchronization reference priorities of carrier 1 and carrier 2, the overlapping parts included in the non-overlapping parts of both include gNB / eNB, UEs that are directly synchronized to the gNB / eNB, and UEs that are indirectly synchronized to the gNB / eNB.

[0186] Example 7: The non-overlapping portions of the synchronization reference order may be pre-defined by the protocol, configured by the network, indicated by the network, or pre-configured.

[0187] b4) Selection priorities may be reordered in a particular synchronization reference procedure.

[0188] b5) The selection priority corresponding to a carrier whose synchronization reference procedure is a particular procedure is higher or lower than the selection priority corresponding to a carrier whose synchronization reference procedure is another procedure.

[0189] It should be noted that the above b2 and b3 can ensure the selection of a carrier that does not conflict with the configuration, where b2 corresponds to a method of determining the selection priority of a carrier whose corresponding synchronization reference priorities of existing carriers are within the overlapping portion, and b3 corresponds to a method of determining the selection priority of a carrier whose corresponding synchronization reference priorities of all carriers are outside the overlapping portion.

[0190] In a second possible example, For a scenario in which the indication information (eg, the synchronization reference priority indication information or the first indication information) is the same, the method for determining the selection priority is as follows.

[0191] Exemplarily, when the indication information of at least some of the multiple carriers is the same, the selection priority order is such that the selection priority corresponding to the carrier with a higher synchronization reference priority is higher or lower than the selection priority corresponding to the carrier with a lower synchronization reference priority.

[0192] Example 8: sl-NbAsSync of carrier 3 and carrier 4 is true, and the synchronization reference priority order (synchronization reference priority c1 to synchronization reference priority c6) of the synchronization references of carrier 3 and carrier 4 is determined as follows.

[0193] Synchronization reference priority c1: UE directly synchronized to GNSS Synchronization reference priority c2: UE indirectly synchronized to GNSS Synchronous reference priority c3:gNB / eNB Synchronization reference priority c4: UE that directly synchronizes with gNB / eNB Synchronization reference priority c5: UE indirectly synchronized to gNB / eNB Synchronization reference priority c6: remaining UE Accordingly, the selection priority order may include order 1, and order 1 (selection priority a1 to selection priority a6) is as follows.

[0194] Selection priority a1: A carrier in which the synchronization reference is a UE that is directly synchronized to the GNSS Selection priority a2: A carrier in which the synchronization reference is a UE that indirectly synchronizes to GNSS Selection priority a3: Carrier whose synchronization reference is gNB / eNB Selection priority a4: A carrier in which the synchronization reference is a UE that directly synchronizes with a gNB / eNB Selection priority a5: A carrier in which the synchronization reference is a UE that indirectly synchronizes to a gNB / eNB Selection priority a6: Carrier whose synchronization reference is the remaining UE It should be noted that the synchronization reference priorities of carrier 3 and carrier 4 are, in descending order, synchronization reference priority c1, synchronization reference priority c2, synchronization reference priority c3, synchronization reference priority c4, synchronization reference priority c5, and synchronization reference priority c6.

[0195] It should be noted that "c1" to "c6" in the synchronization reference priority c1 to synchronization reference priority c6 are used to distinguish different synchronization reference priorities, and the numbers "1" to "6" in the synchronization reference priority c1 to synchronization reference priority c6 may be used to characterize high and low synchronization reference priorities, i.e., the smaller the number, the higher the synchronization reference selection priority represented. The same applies to selection priority a1 to selection priority a6.

[0196] Example 9: sl-NbAsSync of carrier 5 and carrier 6 is true, and the synchronization reference priority order (synchronization reference priority cc1 to synchronization reference priority cc7) of the synchronization references of carrier 5 and carrier 6 is determined as follows.

[0197] Synchronization reference priority cc1: The SLSS ID of the UE is 0 and the coverage indication reference indicates that it is true / The SLSS ID of the UE is 0 and the SLSS is transmitted on the third set of synchronization resources. Synchronization reference priority cc2: The SLSS ID of the UE is 0, and the SLSS is not transmitted on the third set of synchronization resources, and the coverage indication parameter indicates that the priority is false. Synchronization reference priority cc3: UE's SLSS ID is 337 and the coverage indication parameter indicates that it is false Synchronous reference priority cc4:gNB / eNB Synchronization reference priority cc5: The SLSS ID of the UE belongs to the SLSS ID set / part of the set defined in the coverage, and the coverage indication parameter indicates that it is true. Synchronization reference priority cc6: The UE's SLSS ID belongs to the SLSS ID set / part of the set defined in the coverage, and the coverage indication parameter indicates that it is false. Synchronous reference priority cc7: remaining UE Accordingly, the selection priority order may include order 2, and order 2 (selection priorities aa1 to aa7) is as follows.

[0198] Selection priority aa1: the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the coverage indication reference indicates that it is true / the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the SLSS is transmitted on the third set of synchronization resources. Selection priority aa2: A carrier in which the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the SLSS is not transmitted on the third set of synchronization resources, and the coverage indication parameter indicates false. Selection priority aa3: A carrier in which the synchronization reference is SyncRef UE, the SLSS ID of SyncRef UE is 337, and the coverage indication parameter indicates false. Selection priority aa4: Carrier whose synchronization reference is gNB / eNB Selection priority aa5: A carrier whose synchronization reference is SyncRef UE, and whose SLSS ID of SyncRef UE belongs to the SLSS ID set / partial set defined in the coverage, and whose coverage indication parameter indicates that it is true. Selection priority aa6: A carrier whose synchronization reference is SyncRef UE, and whose SLSS ID of SyncRef UE belongs to the SLSS ID set / partial set defined in the coverage, and whose coverage indication parameter indicates false. Selection priority aa7: Carrier whose synchronization reference is another SyncRef UE It should be noted that the synchronization reference priorities of carrier 5 and carrier 6 are, in order from highest to lowest, synchronization reference priority cc1, synchronization reference priority cc2, synchronization reference priority cc3, synchronization reference priority cc4, synchronization reference priority cc5, synchronization reference priority cc6, and synchronization reference priority cc7.

[0199] It should be noted that the priorities corresponding to order 2 are, in descending order, selection priority aa1, selection priority aa2, selection priority aa3, selection priority aa4, selection priority aa5, selection priority aa6, and selection priority aa7.

[0200] As described above, the priority of any item of the selection priority may be the same; for example, the priority (priority procedure) of cc2 and cc3 may be the same, and the priority (priority procedure) of aa2 and aa3 may be the same.

[0201] It should be noted that "cc1" to "cc7" in the synchronization reference priority cc1 to synchronization reference priority cc7 are used to distinguish different synchronization reference priorities, and the numbers "1" to "7" in the synchronization reference priority cc1 to synchronization reference priority cc7 may be used to characterize high and low synchronization reference priorities, i.e., the smaller the number, the higher the synchronization reference selection priority represented. The same applies to selection priority aa1 to selection priority aa7.

[0202] In a third possible example, For a scenario in which the indication information (eg, the synchronization reference priority indication information or the first indication information) is different, the method for determining the selection priority is as follows.

[0203] Exemplarily, when the indication information of multiple carriers is different, the selection priority may be determined by at least one of the following:

[0204] c1) The selection priority corresponding to a carrier with a high synchronization reference priority is higher or lower than the selection priority corresponding to a carrier with a low synchronization reference priority.

[0205] c2) When there is an overlap in the synchronization reference priority order, the selection priority corresponding to a carrier with a higher synchronization reference priority in the overlap is higher or lower than the selection priority corresponding to a carrier with a lower synchronization reference priority in the overlap.

[0206] Example 10: (Definition of Overlapping Part) When determining the selection priority order based on the priority order of the synchronization reference priority of the overlapping part, the selection priority order will be interpreted and explained using the following example.

[0207] For example, if the indication information of at least two carriers is different (eg, sl-NbAsSync is true or false), the corresponding synchronization reference priority order is different.

[0208] Example 1: The sl-NbAsSync of carrier 7 is true, and the synchronization reference priority order (synchronization reference priority d1 to synchronization reference priority d6) of the synchronization reference of carrier 7 is determined as follows.

[0209] Synchronization reference priority d1: UE directly synchronized to GNSS Synchronization reference priority d2: UE indirectly synchronized to GNSS Synchronous reference priority d3: gNB / eNB Synchronization reference priority d4: UE that directly synchronizes with gNB / eNB Synchronization reference priority d5: UE indirectly synchronized to gNB / eNB Synchronization reference priority d6: remaining UE The sl-NbAsSync of carrier 8 is false, and the synchronization reference priority order (synchronization reference priority e1 to synchronization reference priority e3) of the synchronization reference of carrier 8 is determined as follows.

[0210] Synchronization reference priority e1: UE directly synchronized to GNSS Synchronization reference priority e2: UE indirectly synchronized to GNSS Synchronization reference priority e3: remaining UE It should be noted that the synchronization reference priorities of carrier 7 are, in order from highest to lowest, synchronization reference priority d1, synchronization reference priority d2, synchronization reference priority d3, synchronization reference priority d4, synchronization reference priority d5, and synchronization reference priority d6, and the synchronization reference priorities of carrier 8 are, in order from highest to lowest, synchronization reference priority e1, synchronization reference priority e2, and synchronization reference priority e3.

[0211] It should be noted that "d1" to "d6" in the synchronization reference priority d1 to synchronization reference priority d6 are used to distinguish different synchronization reference priorities, and the numbers "1" to "6" in the synchronization reference priority d1 to synchronization reference priority d6 may be used to characterize high and low synchronization reference priorities, i.e., the smaller the number, the higher the synchronization reference selection priority represented. The same applies to the synchronization reference priorities e1 to e3.

[0212] Accordingly, the selection priority order may include order 3, and order 3 (selection priorities b1 to b3) is as follows.

[0213] Order 3: Selection priority b1: A carrier in which the synchronization reference is a UE that is directly synchronized to the GNSS Selection priority b2: A carrier whose synchronization reference is a UE that indirectly synchronizes to GNSS Selection priority b3: The carrier for which the remaining UEs have the lowest priority for synchronization reference It should be noted that in the order 3, the selection priorities are, in descending order, selection priority b1, selection priority b2, and selection priority b3. Example 2: The sl-NbAsSync of carrier 9 is true, and the synchronization reference priority order (synchronization reference priority dd1 to synchronization reference priority dd7) of the synchronization reference of carrier 9 is determined as follows:

[0214] Synchronization reference priority dd1: The SLSS ID of the UE is 0, and the coverage indication reference indicates that it is true / The SLSS ID of the UE is 0, and the SLSS is transmitted on the third set of synchronization resources. Synchronization reference priority dd2: The SLSS ID of the UE is 0, and the SLSS is not transmitted on the third set of synchronization resources, and the coverage indication parameter indicates false. Synchronization reference priority dd3: UE's SLSS ID is 337 and the coverage indication parameter indicates that it is false Synchronous reference priority dd4:gNB / eNB Synchronization reference priority dd5: The SLSS ID of the UE belongs to the SLSS ID set / part of the set defined in the coverage, and the coverage indication parameter indicates that it is true. Synchronization reference priority dd6: The SLSS ID of the UE belongs to the SLSS ID set / part of the set defined in the coverage, and the coverage indication parameter indicates that it is false. Synchronization reference priority dd7: remaining UE As described above, the priority of any of the items of the selection priority may be the same. For example, the priorities (priority order) of dd2 and dd3 may be the same.

[0215] The sl-NbAsSync of the carrier 10 is false, and the synchronization reference priority order (synchronization reference priority ee1 to synchronization reference priority ee4) of the synchronization reference of the carrier 10 is determined as follows.

[0216] Synchronization reference priority ee1: The SLSS ID of the UE is 0 and the coverage indication reference indicates that it is true / The SLSS ID of the UE is 0 and the SLSS is transmitted on the third set of synchronization resources. Synchronization reference priority ee2: The SLSS ID of the UE is 0, and the SLSS is not transmitted on the third set of synchronization resources, and the coverage indication parameter indicates false. Synchronization reference priority ee3: UE's SLSS ID is 337 and the coverage indication parameter indicates that it is false Synchronous reference priority ee4: remaining UE As described above, the priority of any item of the synchronization reference priority may be the same, and for example, the priority (priority procedure) of ee2 and ee3 may be the same.

[0217] It should be noted that the synchronization reference priorities of carrier 9 are, in order from highest to lowest, synchronization reference priority dd1, synchronization reference priority dd2, synchronization reference priority dd3, synchronization reference priority dd4, synchronization reference priority dd5, synchronization reference priority dd6, and synchronization reference priority dd7, and the synchronization reference priorities of carrier 10 are, in order from highest to lowest, synchronization reference priority ee1, synchronization reference priority ee2, synchronization reference priority ee3, and synchronization reference priority ee4.

[0218] It should be noted that "dd1" to "dd7" in the synchronization reference priority dd1 to synchronization reference priority dd7 are used to distinguish different synchronization reference priorities, and the numbers "1" to "7" in the synchronization reference priority dd1 to synchronization reference priority dd7 may be used to characterize high and low synchronization reference priorities, i.e., the smaller the number, the higher the synchronization reference selection priority represented. The same applies to the synchronization reference priorities ee1 to ee4.

[0219] Accordingly, the selection priority order may include order 4, and order 4 (selection priorities bb1 to bb4) is as follows.

[0220] Order 4: Selection priority bb1: the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the coverage indication reference indicates that it is true / the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and it is SLSS Selection priority bb2: A carrier in which the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the SLSS is not transmitted on the third set of synchronization resources, and the coverage indication parameter indicates false. Selection priority bb3: A carrier in which the synchronization reference is SyncRef UE, the SLSS ID of SyncRef UE is 337, and the coverage indication parameter indicates false. Selection priority bb4: Carrier whose synchronization reference is another SyncRef UE As described above, the priority of any of the items of the selection priority may be the same. For example, the priorities (priority order) of bb2 and bb3 may be the same.

[0221] It should be noted that in order 4, the selection priorities are, in descending order, selection priority bb1, selection priority bb2, selection priority bb3, and selection priority bb4. Example 11: The overlapping portion of the synchronization reference priority order is predefined by the protocol, or configured by the network, or indicated by the network, or preconfigured.

[0222] c3) When there is an overlap in the synchronization reference priority order, the selection priority corresponding to a carrier with a higher synchronization reference priority in the non-overlapping part is higher or lower than the selection priority corresponding to a carrier with a lower synchronization reference priority.

[0223] Example 12: When determining the selection priority order based on the priority order of the synchronization reference priorities of the non-overlapping parts (ie, other than the overlapping parts), the selection priority order will be interpreted and explained by the following example.

[0224] For example, if the indication information of at least two carriers (eg, sl-NbAsSync is true or false) is different, the corresponding synchronization reference priority order is different.

[0225] Example 13: In combination with Example 1 above, when the non-overlapping portion of the synchronization reference priorities of carrier 7 and carrier 8 includes three synchronization reference priorities: a gNB / eNB, a UE directly synchronized to the gNB / eNB, and a UE indirectly synchronized to the gNB / eNB, the selection priority order may include the following order 5.

[0226] Order 5: Selection priority d1: Carrier whose synchronization reference is gNB / eNB Selection priority d2: A carrier in which the synchronization reference is a UE that directly synchronizes with a gNB / eNB Selection priority d3: A carrier in which the synchronization reference is a UE that indirectly synchronizes to a gNB / eNB It should be noted that in order 5, the selection priorities are, in descending order, selection priority d1, selection priority d2, and selection priority d3. It should be noted that the "d1" to "d3" in the selection priority d1 to selection priority d3 are used to distinguish different selection priorities, and the numbers "1" to "3" in the selection priority d1 to selection priority d3 may be used to characterize high and low selection priorities, i.e., the smaller the number, the higher the selection priority represented; Example 14: In combination with Example 2 above, when the non-overlapping portion of the synchronization reference priorities of carrier 9 and carrier 10 includes three synchronization reference priorities: one for the gNB / eNB, one for which the UE's SLSS ID belongs to a SLSS ID set / part of a set defined in the coverage and is indicated to be true by the coverage indication parameter, and one for which the UE's SLSS ID belongs to a SLSS ID set / part of a set defined in the coverage and is indicated to be false by the coverage indication parameter, the selection priority order may include the following order 6.

[0227] Order 6: Selection priority dd1: Carrier whose synchronization reference is gNB / eNB Selection priority dd2: A carrier whose synchronization reference is SyncRef UE, and whose SLSS ID of SyncRef UE belongs to the SLSS ID set / partial set defined in the coverage, and whose coverage indication parameter indicates that it is true. Selection priority dd3: A carrier whose synchronization reference is SyncRef UE, and whose SLSS ID of SyncRef UE belongs to the SLSS ID set / partial set defined in the coverage, and whose coverage indication parameter indicates false. As described above, the priority of any of the items of the selection priority may be the same. For example, the priorities (priority order) of dd2 and dd3 may be the same.

[0228] It should be noted that in order 6, the selection priorities are, in descending order, selection priority dd1, selection priority dd2, selection priority dd3, and selection priority dd4. It should be noted that the "dd1" to "dd3" in the above selection priority dd1 to selection priority dd4 are used to distinguish different selection priorities, and the numbers "1" to "4" in the above selection priority dd1 to selection priority dd4 may be used to characterize high and low selection priorities, i.e., the smaller the number, the higher the selection priority represented; It should be explained that the synchronization reference priority order in the embodiment of the present application may be a synchronization reference priority procedure, and the selection priority order may be a selection priority procedure.

[0229] c4) The selection priorities are sorted in a specific synchronization reference priority order.

[0230] c5) The selection priority corresponding to a carrier whose synchronization reference procedure is a particular procedure is higher or lower than the selection priority corresponding to a carrier whose synchronization reference procedure is another procedure.

[0231] It should be clarified that the selection priority orders corresponding to the above selection priority order 1, order 2, order 3, order 4, order 5 and order 6 are examples of possible cases of selection priority orders according to the present application, and do not limit the selection priority orders, and the above selection priority orders may be determined to other orders according to actual circumstances, and the embodiments of the present application do not make any limitations thereon.

[0232] In the carrier determination method according to the embodiment of the present application, a new synchronization carrier selection priority (i.e., selection priority) is designed according to different synchronization parameters, thus ensuring that the synchronization reference obtained based on this synchronization carrier does not collide with the synchronization reference obtained by other aggregation carriers based on their configurations.

[0233] In some possible embodiments, the selection priority is determined based on at least one of the following (d1 to d4):

[0234] d1) a selection priority corresponding to the carrier of the first synchronization reference is higher or lower than a selection priority corresponding to the carrier of the second synchronization reference; Illustratively, the procedure of the first synchronization reference is higher than the procedure of the second synchronization reference, and / or the first synchronization reference is a predetermined synchronization reference (eg, a specific synchronization reference).

[0235] d2) a selection priority corresponding to a carrier having a first HARQ configuration is higher or lower than a selection priority corresponding to a carrier having another HARQ configuration other than the first HARQ configuration; Exemplarily, the first HARQ configuration is a predetermined HARQ configuration (eg, a specific HARQ configuration).

[0236] d3) a selection priority corresponding to a carrier having the first PSFCH configuration is higher or lower than a selection priority corresponding to a carrier having the second PSFCH configuration; Exemplarily, the first PSFCH configuration and the second PSFCH configuration are A periodicity of the first PSFCH configuration is greater than a periodicity of the second PSFCH configuration; A periodicity of the first PSFCH configuration is smaller than a periodicity of the second PSFCH configuration; the first PSFCH configuration is a predetermined PSFCH configuration (e.g., a specific PSFCH configuration); The carrier having the first PSFCH configuration is a carrier having PSFCH resources, and the carrier having the second PSFCH configuration is a carrier having no PSFCH resources, or the carrier having the first PSFCH configuration is a carrier having no PSFCH resources, and the carrier having the second PSFCH configuration is a carrier having PSFCH resources.

[0237] d4) a selection priority corresponding to the carrier of the first SCS is higher or lower than a selection priority corresponding to the carrier of the second SCS; Illustratively, the first SCS is larger than the second SCS and / or the first SCS is a predetermined SCS (eg, a particular SCS).

[0238] In some possible embodiments, the selection priority is determined based on at least one of the following (e1 to e5):

[0239] e1: the selection priority corresponding to the carrier of the first synchronization signal is higher or lower than the selection priority corresponding to the carrier of the second synchronization signal; Illustratively, the period of the first synchronization signal is greater than the period of the second synchronization signal, and / or the period of the first synchronization signal is a third predetermined period (eg, a specific period).

[0240] e2: a selection priority corresponding to a carrier having a first value of the number of synchronization slots in a period is higher or lower than a selection priority corresponding to a carrier having a second value of the number of synchronization slots in a period; Illustratively, the first value is greater than the second value and / or the first value is a first predefined value (eg, a number of synchronization slots within a particular period).

[0241] e3: the selection priority corresponding to the carrier having a third value of the repetition number of the synchronization signal is higher or lower than the selection priority corresponding to the carrier having a fourth value of the repetition number of the synchronization signal; Illustratively, the third value is greater than the fourth value and / or the third value is a second predetermined value (eg, a particular number of repetitions of the synchronization signal).

[0242] e4: the selection priority corresponding to the carrier of the first synchronization slot offset is higher or lower than the selection priority corresponding to the carrier of the second synchronization slot offset; Illustratively, the first sync slot offset amount is greater than the second sync slot offset, and / or the first sync slot offset amount is a predetermined sync slot offset (eg, a specific sync slot offset amount).

[0243] e5: a selection priority corresponding to a carrier in a first time interval is higher or lower than a selection priority corresponding to a carrier in a second time interval; Illustratively, the first time interval is greater than the second time interval and / or the first time interval is a predetermined time interval (eg, a particular time interval).

[0244] Below, the satisfaction conditions of the selection priority will be interpreted and explained using several examples.

[0245] In a possible example of the first kind, For example, when the synchronization reference order of at least some of the multiple carriers is the same, the selection priority is determined based on the rule that the selection priority corresponding to a carrier with a high synchronization reference procedure is higher or lower than the selection priority corresponding to a carrier with a low synchronization reference procedure (in other words, the selection priority must satisfy this content).

[0246] For example, the selection priority corresponding to the carrier with a higher second priority may be higher or lower than the selection priority corresponding to the carrier with a lower second priority.

[0247] For example, the selection priority corresponding to a carrier with high RSRP strength may be higher or lower than the selection priority corresponding to a carrier with low RSRP strength.

[0248] For example, a selection priority corresponding to a carrier before the searched time may be higher or lower than a selection priority corresponding to a carrier after the searched time.

[0249] In a second possible example, For example, when the HARQ configurations of at least some of the multiple carriers are different, the selection priority is determined based on a rule that the selection priority corresponding to a carrier having a particular HARQ configuration is higher or lower than the selection priority corresponding to a carrier having a different HARQ configuration (in other words, the selection priority must satisfy this rule).

[0250] In a third possible example, For example, when the PSFCH configurations of at least some of the multiple carriers are different, the selection priority is determined based on at least one of the following rules (in other words, the selection priority must satisfy at least one of the following):

[0251] 1) A selection priority corresponding to a carrier having a particular PSFCH configuration is higher or lower than a selection priority corresponding to a carrier having another PSFCH configuration; 2) The selection priority corresponding to a carrier having a large period of the PSFCH configuration is higher or lower than the selection priority corresponding to a carrier having a small period of the PSFCH configuration; 3) The selection priority corresponding to the carrier having the PSFCH resource is higher or lower than the selection priority corresponding to the carrier not having the PSFCH resource; Furthermore, the selection priority corresponding to the carrier including at least one resource pool having a PSFCH resource is higher or lower than the selection priority corresponding to the carrier including a resource pool having no PSFCH resource; 4) The selection priority corresponding to the carrier that does not include the PSFCH resource is higher or lower than the selection priority corresponding to the carrier that does not include the PSFCH resource; Furthermore, the selection priority corresponding to a carrier that includes at least one resource pool that does not have a PSFCH resource is higher / lower than the selection priority corresponding to a carrier that includes a resource pool that has a PSFCH resource.

[0252] In a fourth possible example, For example, when the SCSs of at least some of the multiple carriers are different, the selection priority is determined based on at least one of the following rules (in other words, the selection priority must satisfy at least one of the following):

[0253] The selection priority corresponding to the carrier with the larger SCS is higher or lower than the selection priority corresponding to the carrier with the smaller SCS; The selection priority corresponding to a carrier having a particular SCS may be higher or lower than the selection priority corresponding to a carrier having another SCS.

[0254] In a fifth possible example, For example, when different resources of at least some of the multiple carriers are different, the selection priority is determined based on at least one of the following rules (in other words, the selection priority must satisfy at least one of the following):

[0255] The selection priority corresponding to the carrier having a large synchronization signal period is higher or lower than the selection priority corresponding to the carrier having a small synchronization signal period; A selection priority corresponding to a carrier having a particular synchronization signal period is higher or lower than a selection priority corresponding to a carrier having another synchronization signal period; A selection priority corresponding to a carrier with a larger number of synchronization slots in a period is higher or lower than a selection priority corresponding to a carrier with a smaller number of synchronization slots in a period; A selection priority corresponding to a carrier having a certain number of synchronization slots in a certain period is higher or lower than a selection priority corresponding to a carrier having a number of synchronization slots in another period; The selection priority corresponding to the carrier with a large number of repetitions of the synchronization signal is higher or lower than the selection priority corresponding to the carrier with a small number of repetitions of the synchronization signal. The selection priority corresponding to a carrier having a particular repetition number of a synchronization signal is higher or lower than the selection priority corresponding to a carrier having another repetition number of a synchronization signal; The priority (group) of a carrier with a large synchronous slot offset is higher or lower than that of a carrier with a small synchronous slot offset. The priority (group) corresponding to a carrier having a particular synchronous slot offset is higher or lower than the selection priority corresponding to a carrier having another synchronous slot offset; The selection priority corresponding to the carrier having a larger time interval between synchronization signals is higher or lower than the selection priority corresponding to the carrier having a smaller time interval; The selection priority corresponding to a carrier having a particular time interval may be higher or lower than the selection priority corresponding to a carrier having another time interval.

[0256] Exemplarily, the plurality of carriers in the above are: A plurality of carriers used for CA transmission; A plurality of carriers used in multicarrier transmission; A plurality of carriers used in multicarrier transmission; A plurality of carriers used for SL transmission; a first carrier set; A second carrier aggregation; and and a third carrier set; Here, the second carrier set includes carriers that may be used as synchronization carriers, and the third carrier set includes a set of available synchronization carriers.

[0257] Exemplarily, the plurality of carriers includes at least one of: a plurality of carriers of an aggregation carrier, a multi-carrier, at least two carriers, at least some of the carriers in Set A, at least some of the carriers in Set B, and at least some of the carriers in a first carrier set.

[0258] For example, the plurality of carriers may be at least a portion of the carriers of each of the above items, or may be at least a portion of the carriers of the above items, or may be a product of the above items, or may be a subset of the product of the above items.

[0259] For example, the plurality of carriers may be some of the carriers in the second carrier set, or some of the carriers in the third carrier set, or some of the carriers in the second carrier set and some of the carriers in the third carrier set, or the same carriers in the second carrier set and the third carrier set, i.e., the intersection of the second carrier set and the third carrier set.

[0260] Optionally, the carrier determination method according to the embodiment of the present application further includes the following step 203:

[0261] Step 203: Determine a synchronization reference respectively for each carrier in the first carrier set if a predetermined condition is met.

[0262] The above-mentioned predetermined conditions are: the first carrier set is an empty set; and and there is a synchronization reference determined by the at least one carrier that does not match an acceptable synchronization reference obtained based on the synchronization reference priority indication information of the at least one carrier.

[0263] Illustratively, the first carrier set is obtained based on synchronization reference priority indication information and / or first information and / or the number of elements of the first carrier set.

[0264] Hereinafter, the carrier determination method according to the present application will be explained and illustrated by several examples.

[0265] Example 1: The terminal selects a carrier from a first carrier set as a synchronization carrier, and the first carrier set may be any one of the following a), b), c), d), e), f), or g), or a subset of any one of them, or may be a product of any N items thereof, or may be a subset of the product of any N items thereof, where N is an integer greater than 1.

[0266] a)Set A(carriers that can potentially can be used as the synchronization carriers) b)Set B(the available set of synchronization carriers) c) All carriers that can be used for CA transmission d) Carrier actually used for CA transmission e) The carrier once selected for CA transmission f) All carriers available for SL transmission g) Carrier actually used for SL transmission h) Carriers once selected for SL transmission i) A carrier that includes (e.g., configured or pre-configured) synchronization resources For example, when a UE selects carriers actually used for CA transmission and at least one carrier is included in Set A, the first carrier set may be the intersection of the carriers of CA transmission and Set A / a subset of the intersection, i.e., all carriers actually used for CA transmission included in Set A (corresponding to the intersection) / at least one carrier actually used for CA transmission included in Set A (corresponding to the subset of the intersection).

[0267] Or, when the synchronization reference is a carrier configured / pre-configured by the network, the first carrier set may be a carrier whose synchronization reference is configured / pre-configured by the network, and the UE selects a carrier from the carrier whose synchronization reference is configured / pre-configured by the network as a synchronization carrier (corresponding to one); Alternatively, if all carriers that can be used for CA transmission are configured / pre-configured by the network, the first carrier set may be all carriers (corresponding to a subset) that can be used for CA transmission that are configured / pre-configured by at least one network.

[0268] Example 2: A carrier set {CC1, CC2, CC3} is configured or pre-configured by the network, and the synchronization reference priority order of this carrier set is the same, i.e., sl-NbAsSync is all true, and the UE selects a synchronization carrier from this carrier set, and takes the synchronization reference corresponding to the synchronization carrier as the synchronization reference of other CA carriers.

[0269] For example, in conjunction with Table 1, the synchronization reference of CC1 may be P1, the synchronization reference of CC2 may be P2, and the synchronization reference of CC3 may be P4. Thus, according to rule 1 (i.e., a carrier with a higher synchronization reference priority has a higher selection priority), the terminal may finally select a carrier with a higher synchronization reference priority as a synchronization carrier, that is, the terminal selects CC1 as a synchronization carrier.

[0270] Example 3: A carrier set {CC1, CC2, CC3} is configured by the network or pre-configured, and a terminal selects a synchronization carrier from this carrier set, and the synchronization reference priority orders of the carrier sets are different.

[0271] For example, the sl-NbAsSync of the CC1 configuration is true, the synchronization reference priority order is P1 / P2 / P3 / P4 / P5 / P6, and the synchronization reference is P1, the sl-NbAsSync of the CC2 configuration is true, the synchronization reference priority order is P1 / P2 / P3 / P4 / P5 / P6, and the synchronization reference is P2, and the sl-NbAsSync of the CC3 configuration is false, the synchronization reference priority order is P1 / P2 / P6, and the synchronization reference is P6. Based on rule 2 (i.e., when there is an overlap in the synchronization reference priority order of multiple carriers, the selection priority corresponding to the carrier with the high synchronization reference priority of the overlapping part is high), the terminal selects the carrier with the high synchronization reference priority of the overlapping part as the synchronization carrier, i.e., the terminal selects CC3 as the synchronization carrier.

[0272] Example 4: A carrier set {CC1, CC2, CC3} is configured or pre-configured by the network, and the terminal selects a synchronization carrier from this carrier set, and the SCS of this carrier set is the same, and the synchronization reference priority order of the carrier set is the same.

[0273] For example, sl-NbAsSync are all true, the SCS of the CC1 configuration is 30KHz, and the synchronization reference is P1, the SCS of the CC2 configuration is 60KHz, and the synchronization reference is P2, and the SCS of the CC3 configuration is 120KHz, and the synchronization reference is P4.

[0274] Based on rule 3 (when the synchronization reference priority order is the same, the selection priority corresponding to the carrier with a higher SCS is higher), the terminal may finally select the carrier with a larger SCS as the synchronization carrier, i.e., the terminal selects CC3 as the synchronization carrier.

[0275] Example 5: A carrier set {CC1, CC2, CC3} is configured by the network or pre-configured, and a terminal selects a synchronization carrier from this carrier set, and the SCSs of the carrier sets are different.

[0276] For example, the SCS of the CC1 configuration is 30KHz, the SCS of the CC2 configuration is 60KHz, and the SCS of the CC3 configuration is 120KHz.

[0277] According to rule 4 (a carrier with a higher SCS corresponds to a higher selection priority), the terminal may finally select a carrier with a larger SCS as the synchronization carrier, that is, the terminal selects CC3 as the synchronization carrier.

[0278] Example 6: The terminal determines a carrier set for selecting a synchronization carrier, where the carrier set may be a network-configured or pre-configured carrier set, or the carrier set may be determined based on at least one of a network-configured or pre-configured carrier set Set 0 that may be used for carrier aggregation and a network-configured or pre-configured carrier set Set A that may be used for synchronization carriers, where the terminal selects aggregation carriers in Set 0, and for aggregation carriers included in Set A, selects a carrier set of synchronization carriers for the UE.

[0279] Example 7: Optionally, when the synchronization reference type parameter is a base station, the selection flow of the synchronization carrier is as follows:

[0280] Exemplarily, the carrier selected by the UE for CA transmission / SL transmission is: The carrier is in a set of carriers available for CA transmission / SL transmission configured by the network; and At least one carrier is included in Set A; and The synchronization reference type parameter (sl-SyncPriority) is configured by the network as a base station if at least one of the following conditions is satisfied: One carrier is selected as a synchronization carrier from one or more carriers included in Set A.

[0281] Exemplarily, the carrier selected by the UE for CA transmission is: The carrier is in a preconfigured set of available carriers for CA transmission / SL transmission; and At least one carrier is included in Set A; and If at least one of the following conditions is satisfied: the synchronization reference type parameter (sl-SyncPriority) is pre-configured as the eNB (nnb); The synchronization reference of one or more carriers included in Set A is determined, and rearranged according to the following selection priority order (P1 to P6), and one of the carriers with the highest priority is selected as the synchronization carrier.

[0282] P1: A carrier whose synchronization reference is a UE that directly synchronizes with the eNB P2: A carrier whose synchronization reference is a UE that indirectly synchronizes to an eNB P3: A carrier whose synchronization reference is GNSS P4: A carrier in which the synchronization reference is a UE that is directly synchronized to GNSS P5: Carrier where the synchronization reference is a UE that indirectly synchronizes to GNSS P6: Carrier whose synchronization reference is the remaining UE As can be seen, the selection priority order is, from highest to lowest, P1, P2, P3, P4, P5, and P6.

[0283] It should be noted that, if there are multiple carriers that meet the conditions, the UE autonomously selects one of them as the synchronization carrier.

[0284] Optionally, when the synchronization reference type parameter is GNSS, the selection flow of the synchronization carrier is as follows:

[0285] Exemplarily, the carrier selected by the UE for CA transmission is: The carrier is in a set of carriers available for CA transmission / SL transmission, configured / pre-configured by the network; At least one carrier is included in Set A; and If at least one of the following conditions is satisfied: the synchronization reference type parameter (sl-SyncPriority) is configured / pre-configured by the network as GNSS, and GNSS is reliable; From the carriers included in SetA, one carrier with reliable GNSS is selected as the synchronization carrier.

[0286] Exemplarily, the carrier selected by the UE for CA transmission is: The carrier is in a set of carriers available for CA transmission / SL transmission, configured / pre-configured by the network; At least one carrier is included in Set A; and If at least one of the following conditions is satisfied: the synchronization reference type parameter (sl-SyncPriority) is configured / pre-configured by the network as GNSS, and GNSS is not reliable; The synchronization reference of one or more carriers included in Set A is determined, and rearranged according to the following selection priorities (P1 to P6), and one of the carriers with the highest priority is selected as the synchronization carrier.

[0287] P1: A carrier in which the synchronization reference is a UE that is directly synchronized to GNSS P2: A carrier whose synchronization reference is a UE that indirectly synchronizes to GNSS P3: CC with synchronization reference gNB / eNB P4: A carrier whose synchronization reference is a UE that directly synchronizes to a gNB / eNB P5: A carrier whose synchronization reference is a UE that indirectly synchronizes to a gNB / eNB P6: Carrier whose synchronization reference is the remaining UE It should be noted that if there are multiple carriers that satisfy the conditions, the UE will autonomously select one of them.

[0288] As can be seen, the selection priority order is, from highest to lowest, P1, P2, P3, P4, P5, and P6.

[0289] It should be noted that, if there are multiple carriers that meet the conditions, the UE autonomously selects one of them as the synchronization carrier.

[0290] Exemplarily, the carrier selected by the UE for CA transmission is: The carrier is in a set of carriers available for CA transmission / SL transmission, configured / pre-configured by the network; If at least one of the following conditions is met: there is no carrier in Set A; That is, when the first carrier set is a null set, the UE determines a synchronization reference for each carrier selected for CA transmission respectively.

[0291] Example 8: When the synchronization reference priority order (sl-NbAsSync) of the CA carrier / SL transmission carrier / multiple carriers / at least one carrier / Set A / Set B / synchronization carrier that is pre-configured / configured by the network / selected by the UE is different, the synchronization carrier selection flow may follow Example 2 or may be as follows:

[0292] Optionally, if the synchronization reference type parameter is base station, the synchronization carrier selection flow is the same as in the above embodiment 2.

[0293] Optionally, if the synchronization reference type parameter is GNSS, Exemplarily, the carrier selected by the UE for CA transmission is: The carrier is in a set of carriers available for CA transmission / SL transmission, configured / pre-configured by the network; At least one carrier is included in Set A; and The synchronization reference type parameter (sl-SyncPriority) is configured / pre-configured by the network as GNSS, and GNSS is reliable; If at least one of the following conditions is satisfied: the synchronization reference priority order (sl-NbAsSync) of at least some carriers in the pre-configured / network-configured / UE-selected CA carrier / SL transmission carrier / multiple carriers / at least two carriers / Set A / Set B / first carrier set is different; From the carriers included in SetA, one carrier with reliable GNSS is selected as the synchronization carrier.

[0294] Exemplarily, the carrier selected by the UE for CA transmission is: The carrier is in a set of carriers available for CA transmission / SL transmission, configured / pre-configured by the network; At least one carrier is included in Set A; and The synchronization reference type parameter (sl-SyncPriority) is configured / pre-configured by the network as GNSS, and GNSS is not reliable; If at least one of the following conditions is satisfied: the synchronization reference priority order (sl-NbAsSync) of at least some carriers in the pre-configured / network-configured / UE-selected CA carrier / SL transmission carrier / multiple carriers / at least two carriers / Set A / Set B / first carrier set is different; A synchronization reference for one or more carriers included in Set A is determined, and one of the carriers with the highest selection priority is selected as a synchronization carrier according to the following selection priorities ((P1 to P6)).

[0295] P1: A carrier in which the synchronization reference is a UE that is directly synchronized to GNSS P2: A carrier whose synchronization reference is a UE that indirectly synchronizes to GNSS P3: Carrier whose synchronization reference is gNB / eNB P4: A carrier whose synchronization reference is a UE that directly synchronizes to a gNB / eNB P5: A carrier whose synchronization reference is a UE that indirectly synchronizes to a gNB / eNB P6: Carrier whose synchronization reference is the remaining UE As can be seen, the selection priority order is, from highest to lowest, P1, P2, P3, P4, P5, and P6.

[0296] The flow of determining a synchronization carrier based on synchronization reference priority will be described below with reference to Example 1.

[0297] Example S1: Exemplarily, the carrier selected by the UE for CA transmission is: The carrier is in a set of carriers available for CA transmission / SL transmission, configured / pre-configured by the network; At least one carrier is included in Set A; and The synchronization reference type parameter (sl-SyncPriority) is configured / pre-configured by the network as GNSS, and GNSS is not reliable; If at least one of the following conditions is satisfied: the synchronization reference priority order (sl-NbAsSync) of at least some carriers in the pre-configured / network-configured / UE-selected CA carrier / SL transmission carrier / multiple carriers / at least two carriers / Set A / Set B / first carrier set is different; The synchronization reference of one or more carriers included in Set A is determined, and the selection priority of the carriers is determined according to the following rules, and one of the carriers with the highest selection priority is selected as the synchronization carrier.

[0298] P1: A carrier in which the synchronization reference is a UE that is directly synchronized to GNSS P2: A carrier whose synchronization reference is a UE that indirectly synchronizes to GNSS P3: Carrier whose synchronization reference is gNB / eNB P4: A carrier whose synchronization reference is a UE that directly synchronizes to a gNB / eNB P5: A carrier whose synchronization reference is a UE that indirectly synchronizes to a gNB / eNB P6: Carrier whose synchronization reference is the remaining UE The rules are as follows:

[0299] When the selection priority corresponding to at least one carrier is P1 or P2, the UE selects, as the synchronization carrier, a carrier with a higher selection priority from among those with a corresponding selection priority of P1 to P2.

[0300] If the corresponding priorities of all the carriers are P6, the UE selects the carriers whose corresponding selection priorities are P6 as the synchronization carriers.

[0301] If the selection priority corresponding to all carriers configured with sl-NbAsSync false is P6, and the selection priority corresponding to at least one carrier configured with sl-NbAsSync true is P3, P4, or P5, the UE selects the carrier whose corresponding selection priority is P6 as the synchronization carrier.

[0302] Exemplarily, the above selection priority order is obtained based on the synchronization reference priority, for example, a carrier having a higher synchronization reference priority corresponds to a higher selection priority.

[0303] The flow of determining the synchronization carrier based on the synchronization reference priority order will be described with the following example.

[0304] Example S2: Exemplarily, the carrier selected by the UE for CA transmission is: The carrier is in a set of carriers available for CA transmission / SL transmission, configured / pre-configured by the network; At least one carrier is included in Set A; and The synchronization reference type parameter (sl-SyncPriority) is configured / pre-configured by the network as GNSS, and GNSS is not reliable; If at least one of the following conditions is satisfied: the synchronization reference priority order (sl-NbAsSync) of at least some carriers in the pre-configured / network-configured / UE-selected CA carrier / SL transmission carrier / multiple carriers / at least two carriers / Set A / Set B / first carrier set is different; The synchronization reference of one or more carriers included in Set A is determined, and the selection priority of the carriers is determined according to the following rules, and one of the carriers with the highest selection priority is selected as the synchronization carrier.

[0305] P1: A carrier in which the synchronization reference is a UE that is directly synchronized to GNSS P2: A carrier whose synchronization reference is a UE that indirectly synchronizes to GNSS P3: Carrier whose synchronization reference is gNB / eNB P4: A carrier whose synchronization reference is a UE that directly synchronizes to a gNB / eNB P5: A carrier whose synchronization reference is a UE that indirectly synchronizes to a gNB / eNB P6: Carrier whose synchronization reference is the remaining UE The rules are as follows:

[0306] Exemplarily, the conditions for determining the selection priority include, when there is an overlap in the synchronization reference priority order and the selection priority corresponding to a carrier with a higher synchronization reference priority in the overlap is high, if the priorities corresponding to at least one carrier are P1, P2, and P6, the UE selects a carrier with a higher selection priority from those corresponding to selection priorities P1, P2, and P6 as a synchronization carrier.

[0307] Exemplarily, the conditions for determining the selection priority include: when there is an overlap in the synchronization reference priority order and the selection priority corresponding to a carrier with a high synchronization reference priority in the non-overlapping part is high, if there is no carrier with a corresponding selection priority of P1, P2, P6, i.e., the selection priorities corresponding to all carriers are P3, P4, P5, the UE selects a carrier with a high selection priority from those with a corresponding selection priority of P3, P4, P5 as the synchronization carrier.

[0308] Example S3: The carrier selected by the UE for CA transmission is The carrier is in a set of carriers available for CA transmission / SL transmission, configured / pre-configured by the network; At least one carrier is included in Set A; and The synchronization reference type parameter (sl-SyncPriority) is configured / pre-configured by the network as GNSS, and GNSS is not reliable; If at least one of the following conditions is satisfied: the synchronization reference priority order (sl-NbAsSync) of at least some carriers in the pre-configured / network-configured / UE-selected CA carrier / SL transmission carrier / multiple carriers / at least two carriers / Set A / Set B / first carrier set is different; Determine the synchronization reference of one or more carriers included in Set A, and the UE selects a carrier with a higher synchronization reference priority as the synchronization carrier. If there is a mismatch between the synchronization reference determined by one carrier and the allowable synchronization reference obtained based on the synchronization reference priority order configured by the carriers, determine the synchronization reference for each carrier respectively.

[0309] It should be noted that when there are multiple carriers that satisfy the selection priority, the UE autonomously selects one of them as the synchronization carrier.

[0310] It should be noted that when there are multiple carriers that satisfy the selection priority, the UE autonomously selects one of them as the synchronization carrier.

[0311] Example 8: Optionally, when the synchronization reference type parameter is a base station, the selection flow of the synchronization carrier is as follows:

[0312] Exemplarily, the carrier selected by the UE for CA transmission / SL transmission is: The carrier is in a set of carriers available for CA transmission / SL transmission configured by the network; and At least one carrier is included in Set A; and The synchronization reference type parameter (sl-SyncPriority) is configured by the network as a base station if at least one of the following conditions is satisfied: One carrier is selected as a synchronization carrier from one or more carriers included in Set A.

[0313] Exemplarily, the carrier selected by the UE for CA transmission is: The carrier is in a preconfigured set of available carriers for CA transmission / SL transmission; and At least one carrier is included in Set A; and The synchronization reference type parameter (sl-SyncPriority) is pre-configured as a base station. A synchronization reference for one or more carriers included in Set A is determined, and one of the carriers having the highest priority is selected as a synchronization carrier according to the following selection priority order (P1 to P6).

[0314] P1: A carrier in which the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE belongs to the SLSS ID set / partial set defined in the coverage, and the coverage indication parameter indicates that it is true. P2: A carrier in which the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE belongs to the SLSS ID set / partial set defined in the coverage, and the coverage indication parameter indicates false. P3: A carrier whose synchronization reference is GNSS P4: The synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the coverage indication reference indicates true / the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the SLSS is transmitted on the third set of synchronization resources. P5: A carrier where the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the SLSS is not transmitted on the third set of synchronization resources, and the coverage indication parameter indicates false. P5: A carrier in which the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 337, and the coverage indication parameter indicates false. P6: Carrier whose synchronization reference is another SyncRef UE As can be seen, the selection priority order is, from highest to lowest, P1, P2, P3, P4, P5, and P6.

[0315] It should be noted that, if there are multiple carriers that meet the conditions, the UE autonomously selects one of them as the synchronization carrier.

[0316] Optionally, when the synchronization reference type parameter is GNSS, the selection flow of the synchronization carrier is as follows:

[0317] Exemplarily, the carrier selected by the UE for CA transmission is: The carrier is in a set of carriers available for CA transmission / SL transmission, configured / pre-configured by the network; At least one carrier is included in Set A; and If at least one of the following conditions is satisfied: the synchronization reference type parameter (sl-SyncPriority) is configured / pre-configured by the network as GNSS, and GNSS is reliable; From the carriers included in SetA, one carrier with reliable GNSS is selected as the synchronization carrier.

[0318] Exemplarily, the carrier selected by the UE for CA transmission is: The carrier is in a set of carriers available for CA transmission / SL transmission, configured / pre-configured by the network; At least one carrier is included in Set A; and If at least one of the following conditions is satisfied: the synchronization reference type parameter (sl-SyncPriority) is configured / pre-configured by the network as GNSS, and GNSS is not reliable; A synchronization reference for one or more carriers included in Set A is determined, and one of the carriers having the highest selection priority is selected as a synchronization carrier according to the following selection priority order (P1 to P6).

[0319] P1: A carrier in which the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE belongs to the SLSS ID set / partial set defined in the coverage, and the coverage indication parameter indicates that it is true. P2: A carrier in which the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE belongs to the SLSS ID set / partial set defined in the coverage, and the coverage indication parameter indicates false. P3: A carrier whose synchronization reference is GNSS P4: The synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the coverage indication reference indicates true / the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the SLSS is transmitted on the third set of synchronization resources. P5: A carrier where the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the SLSS is not transmitted on the third set of synchronization resources, and the coverage indication parameter indicates false. P5: A carrier in which the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 337, and the coverage indication parameter indicates false. P6: Carrier whose synchronization reference is another SyncRef UE As can be seen, the selection priority order is, from highest to lowest, P1, P2, P3, P4, P5, and P6.

[0320] It should be noted that, if there are multiple carriers that meet the conditions, the UE autonomously selects one of them as the synchronization carrier.

[0321] Exemplarily, the carrier selected by the UE for CA transmission is: The carrier is in a set of carriers available for CA transmission / SL transmission, configured / pre-configured by the network; If at least one of the following conditions is met: there is no carrier in Set A; That is, when the first carrier set is a null set, the UE determines a synchronization reference for each carrier selected for CA transmission respectively.

[0322] Example 9: When the synchronization reference priority order (sl-NbAsSync) of the CA carrier / SL transmission carrier / multiple carriers / at least one carrier / Set A / Set B / synchronization carrier that is pre-configured / configured by the network / selected by the UE is different, the synchronization carrier selection flow may follow Example 2 or may be as follows:

[0323] Optionally, if the synchronization reference type parameter is base station, the synchronization carrier selection flow is the same as in the above embodiment 2.

[0324] Optionally, if the synchronization reference type parameter is GNSS, Exemplarily, the carrier selected by the UE for CA transmission is: The carrier is in a set of carriers available for CA transmission / SL transmission, configured / pre-configured by the network; At least one carrier is included in Set A; and The synchronization reference type parameter (sl-SyncPriority) is configured / pre-configured by the network as GNSS, and GNSS is reliable; If at least one of the following conditions is satisfied: the synchronization reference priority order (sl-NbAsSync) of at least some carriers in the pre-configured / network-configured / UE-selected CA carrier / SL transmission carrier / multiple carriers / at least two carriers / Set A / Set B / first carrier set is different; From the carriers included in SetA, one carrier with reliable GNSS is selected as the synchronization carrier.

[0325] Exemplarily, the carrier selected by the UE for CA transmission is: The carrier is in a set of carriers available for CA transmission / SL transmission, configured / pre-configured by the network; At least one carrier is included in Set A; and The synchronization reference type parameter (sl-SyncPriority) is configured / pre-configured by the network as GNSS, and GNSS is not reliable; If at least one of the following conditions is satisfied: the synchronization reference priority order (sl-NbAsSync) of at least some carriers in the pre-configured / network-configured / UE-selected CA carrier / SL transmission carrier / multiple carriers / at least two carriers / Set A / Set B / first carrier set is different; A synchronization reference for one or more carriers included in Set A is determined, and one of the carriers with the highest selection priority is selected as a synchronization carrier according to the following selection priorities (P1 to P6).

[0326] P1: A carrier in which the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE belongs to the SLSS ID set / partial set defined in the coverage, and the coverage indication parameter indicates that it is true. P2: A carrier in which the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE belongs to the SLSS ID set / partial set defined in the coverage, and the coverage indication parameter indicates false. P3: A carrier whose synchronization reference is GNSS P4: The synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the coverage indication reference indicates true / the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the SLSS is transmitted on the third set of synchronization resources. P5: A carrier where the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the SLSS is not transmitted on the third set of synchronization resources, and the coverage indication parameter indicates false. P5: A carrier in which the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 337, and the coverage indication parameter indicates false. P6: Carrier whose synchronization reference is another SyncRef UE As can be seen, the selection priority order is, from highest to lowest, P1, P2, P3, P4, P5, and P6.

[0327] The flow of determining a synchronization carrier based on synchronization reference priority will be described below with reference to Example 1.

[0328] Example 1: Exemplarily, the carrier selected by the UE for CA transmission is: The carrier is in a set of carriers available for CA transmission / SL transmission, configured / pre-configured by the network; At least one carrier is included in Set A; and The synchronization reference type parameter (sl-SyncPriority) is configured / pre-configured by the network as GNSS, and GNSS is not reliable; If at least one of the following conditions is satisfied: the synchronization reference priority order (sl-NbAsSync) of at least some carriers in the pre-configured / network-configured / UE-selected CA carrier / SL transmission carrier / multiple carriers / at least two carriers / Set A / Set B / first carrier set is different; The synchronization reference of one or more carriers included in Set A is determined, and the selection priority of the carriers is determined according to the following rules, and one of the carriers with the highest selection priority is selected as the synchronization carrier.

[0329] P1: A carrier in which the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE belongs to the SLSS ID set / partial set defined in the coverage, and the coverage indication parameter indicates that it is true. P2: A carrier in which the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE belongs to the SLSS ID set / partial set defined in the coverage, and the coverage indication parameter indicates false. P3: A carrier whose synchronization reference is GNSS P4: The synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the coverage indication reference indicates true / the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the SLSS is transmitted on the third set of synchronization resources. P5: A carrier where the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the SLSS is not transmitted on the third set of synchronization resources, and the coverage indication parameter indicates false. P5: A carrier in which the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 337, and the coverage indication parameter indicates false. P6: Carrier whose synchronization reference is another SyncRef UE The rules are as follows:

[0330] When the selection priority corresponding to at least one carrier is P1 or P2, the UE selects, as the synchronization carrier, a carrier with a higher selection priority from among those with a corresponding selection priority of P1 to P2.

[0331] If the corresponding priorities of all the carriers are P6, the UE selects the carriers whose corresponding selection priorities are P6 as the synchronization carriers.

[0332] If the selection priority corresponding to all carriers configured with sl-NbAsSync false is P6, and the selection priority corresponding to at least one carrier configured with sl-NbAsSync true is P3, P4, or P5, the UE selects the carrier whose corresponding selection priority is P6 as the synchronization carrier.

[0333] Exemplarily, the above selection priority order is obtained based on the synchronization reference priority, for example, a carrier having a higher synchronization reference priority corresponds to a higher selection priority.

[0334] The flow of determining the synchronization carrier based on the synchronization reference priority order will be described with the following example.

[0335] Example 2: Exemplarily, the carrier selected by the UE for CA transmission is: The carrier is in a set of carriers available for CA transmission / SL transmission, configured / pre-configured by the network; At least one carrier is included in Set A; and The synchronization reference type parameter (sl-SyncPriority) is configured / pre-configured by the network as GNSS, and GNSS is not reliable; If at least one of the following conditions is satisfied: the synchronization reference priority order (sl-NbAsSync) of at least some carriers in the pre-configured / network-configured / UE-selected CA carrier / SL transmission carrier / multiple carriers / at least two carriers / Set A / Set B / first carrier set is different; The synchronization reference of one or more carriers included in Set A is determined, and the selection priority of the carriers is determined according to the following rules, and one of the carriers with the highest selection priority is selected as the synchronization carrier.

[0336] P1: A carrier in which the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE belongs to the SLSS ID set / partial set defined in the coverage, and the coverage indication parameter indicates that it is true. P2: A carrier in which the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE belongs to the SLSS ID set / partial set defined in the coverage, and the coverage indication parameter indicates false. P3: A carrier whose synchronization reference is GNSS P4: The synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the coverage indication reference indicates true / the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the SLSS is transmitted on the third set of synchronization resources. P5: A carrier where the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the SLSS is not transmitted on the third set of synchronization resources, and the coverage indication parameter indicates false. P5: A carrier in which the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 337, and the coverage indication parameter indicates false. P6: Carrier whose synchronization reference is another SyncRef UE The rules are as follows:

[0337] Exemplarily, the conditions for determining the selection priority include, when there is an overlap in the synchronization reference priority order and the selection priority corresponding to a carrier with a higher synchronization reference priority in the overlap is high, if the priorities corresponding to at least one carrier are P1, P2, and P6, the UE selects a carrier with a higher selection priority from those corresponding to selection priorities P1, P2, and P6 as a synchronization carrier.

[0338] Exemplarily, the conditions for determining the selection priority include: when there is an overlap in the synchronization reference priority order and the selection priority corresponding to a carrier with a high synchronization reference priority in the non-overlapping part is high, if there is no carrier with a corresponding selection priority of P1, P2, P6, i.e., the selection priorities corresponding to all carriers are P3, P4, P5, the UE selects a carrier with a high selection priority from those with a corresponding selection priority of P3, P4, P5 as the synchronization carrier.

[0339] Example 3: The carrier selected by the UE for CA transmission is The carrier is in a set of carriers available for CA transmission / SL transmission, configured / pre-configured by the network; At least one carrier is included in Set A; and The synchronization reference type parameter (sl-SyncPriority) is configured / pre-configured by the network as GNSS, and GNSS is not reliable; If at least one of the following conditions is satisfied: the synchronization reference priority order (sl-NbAsSync) of at least some carriers in the pre-configured / network-configured / UE-selected CA carrier / SL transmission carrier / multiple carriers / at least two carriers / Set A / Set B / first carrier set is different; Determine the synchronization reference of one or more carriers included in Set A, and the UE selects a carrier with a higher synchronization reference priority as the synchronization carrier. If there is a mismatch between the synchronization reference determined by one carrier and the allowable synchronization reference obtained based on the synchronization reference priority order configured by the carriers, determine the synchronization reference for each carrier respectively.

[0340] It should be noted that when there are multiple carriers that satisfy the selection priority, the UE autonomously selects one of them as the synchronization carrier.

[0341] Example 10: Optionally, when the synchronization reference type parameter is a base station, the selection flow of the synchronization carrier is as follows:

[0342] Exemplarily, the carrier selected by the UE for CA transmission / SL transmission is: The carrier is in a set of carriers available for CA transmission / SL transmission configured by the network; and At least one carrier is included in Set A; and The synchronization reference type parameter (sl-SyncPriority) is configured by the network as a base station if at least one of the following conditions is satisfied: One carrier is selected as a synchronization carrier from one or more carriers included in Set A.

[0343] Exemplarily, the carrier selected by the UE for CA transmission is: The carrier is in a preconfigured set of available carriers for CA transmission / SL transmission; and At least one carrier is included in Set A; and The synchronization reference type parameter (sl-SyncPriority) is pre-configured as a base station. The synchronization reference of one or more carriers included in Set A is determined, and one of the carriers having the highest priority is selected as the synchronization carrier according to the following selection priority order (P1 to P6).

[0344] P1: The synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the coverage indication reference indicates that it is true / the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the SLSS is transmitted on the third set of synchronization resources. P2: A carrier where the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the SLSS is not transmitted on the third set of synchronization resources, and the coverage indication parameter indicates false. P2: A carrier in which the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 337, and the coverage indication parameter indicates false. P3: Carrier whose synchronization reference is gNB / eNB P4: A carrier in which the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE belongs to the SLSS ID set / partial set defined in the coverage, and the coverage indication parameter indicates that the carrier is true. P5: A carrier in which the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE belongs to the SLSS ID set / partial set defined in the coverage, and the coverage indication parameter indicates false. P6: Carrier whose synchronization reference is another SyncRef UE As can be seen, the selection priority order is, from highest to lowest, P1, P2, P3, P4, P5, and P6.

[0345] It should be noted that, if there are multiple carriers that meet the conditions, the UE autonomously selects one of them as the synchronization carrier.

[0346] Optionally, when the synchronization reference type parameter is GNSS, the selection flow of the synchronization carrier is as follows:

[0347] Exemplarily, the carrier selected by the UE for CA transmission is: The carrier is in a set of carriers available for CA transmission / SL transmission, configured / pre-configured by the network; At least one carrier is included in Set A; and If at least one of the following conditions is satisfied: the synchronization reference type parameter (sl-SyncPriority) is configured / pre-configured by the network as GNSS, and GNSS is reliable; From the carriers included in SetA, one carrier with reliable GNSS is selected as the synchronization carrier.

[0348] Exemplarily, the carrier selected by the UE for CA transmission is: The carrier is in a set of carriers available for CA transmission / SL transmission, configured / pre-configured by the network; At least one carrier is included in Set A; and If at least one of the following conditions is satisfied: the synchronization reference type parameter (sl-SyncPriority) is configured / pre-configured by the network as GNSS, and GNSS is not reliable; A synchronization reference for one or more carriers included in Set A is determined, and one of the carriers having the highest selection priority is selected as a synchronization carrier according to the following selection priority order (P1 to P6).

[0349] P1: The synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the coverage indication reference indicates that it is true / the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the SLSS is transmitted on the third set of synchronization resources. P2: A carrier where the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the SLSS is not transmitted on the third set of synchronization resources, and the coverage indication parameter indicates false. P2: A carrier in which the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 337, and the coverage indication parameter indicates false. P3: Carrier whose synchronization reference is gNB / eNB P4: A carrier in which the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE belongs to the SLSS ID set / partial set defined in the coverage, and the coverage indication parameter indicates that it is true. P5: A carrier in which the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE belongs to the SLSS ID set / partial set defined in the coverage, and the coverage indication parameter indicates false. P6: Carrier whose synchronization reference is another SyncRef UE As can be seen, the selection priority order is, from highest to lowest, P1, P2, P3, P4, P5, and P6.

[0350] It should be noted that, if there are multiple carriers that meet the conditions, the UE autonomously selects one of them as the synchronization carrier.

[0351] Exemplarily, the carrier selected by the UE for CA transmission is: The carrier is in a set of carriers available for CA transmission / SL transmission, configured / pre-configured by the network; If at least one of the following conditions is met: there is no carrier in Set A; That is, when the first carrier set is a null set, the UE determines a synchronization reference for each carrier selected for CA transmission respectively.

[0352] Example 11: When the synchronization reference priority order (sl-NbAsSync) of the CA carrier / SL transmission carrier / multiple carriers / at least one carrier / Set A / Set B / synchronization carrier that is pre-configured / configured by the network / selected by the UE is different, the synchronization carrier selection flow may follow Example 2 or may be as follows:

[0353] Optionally, if the synchronization reference type parameter is base station, the synchronization carrier selection flow is the same as in the above embodiment 2.

[0354] Optionally, if the synchronization reference type parameter is GNSS, Exemplarily, the carrier selected by the UE for CA transmission is: The carrier is in a set of carriers available for CA transmission / SL transmission, configured / pre-configured by the network; At least one carrier is included in Set A; and The synchronization reference type parameter (sl-SyncPriority) is configured / pre-configured by the network as GNSS, and GNSS is reliable; If at least one of the following conditions is satisfied: the synchronization reference priority order (sl-NbAsSync) of at least some carriers in the pre-configured / network-configured / UE-selected CA carrier / SL transmission carrier / multiple carriers / at least two carriers / Set A / Set B / first carrier set is different; From the carriers included in SetA, one carrier with reliable GNSS is selected as the synchronization carrier.

[0355] Exemplarily, the carrier selected by the UE for CA transmission is: The carrier is in a set of carriers available for CA transmission / SL transmission, configured / pre-configured by the network; At least one carrier is included in Set A; and The synchronization reference type parameter (sl-SyncPriority) is configured / pre-configured by the network as GNSS, and GNSS is not reliable; If at least one of the following conditions is satisfied: the synchronization reference priority order (sl-NbAsSync) of at least some carriers in the pre-configured / network-configured / UE-selected CA carrier / SL transmission carrier / multiple carriers / at least two carriers / Set A / Set B / first carrier set is different; A synchronization reference for one or more carriers included in Set A is determined, and one of the carriers with the highest selection priority is selected as a synchronization carrier according to the following selection priorities (P1 to P6).

[0356] P1: The synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the coverage indication reference indicates that it is true / the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the SLSS is transmitted on the third set of synchronization resources. P2: A carrier where the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the SLSS is not transmitted on the third set of synchronization resources, and the coverage indication parameter indicates false. P2: A carrier in which the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 337, and the coverage indication parameter indicates false. P3: Carrier whose synchronization reference is gNB / eNB P4: A carrier in which the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE belongs to the SLSS ID set / partial set defined in the coverage, and the coverage indication parameter indicates that the carrier is true. P5: A carrier in which the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE belongs to the SLSS ID set / partial set defined in the coverage, and the coverage indication parameter indicates false. P6: Carrier whose synchronization reference is another SyncRef UE As can be seen, the selection priority order is, from highest to lowest, P1, P2, P3, P4, P5, and P6.

[0357] As can be seen, the selection priority order is, from highest to lowest, P1, P2, P3, P4, P5, and P6.

[0358] The flow of determining a synchronization carrier based on synchronization reference priority will be described below with reference to Example 1.

[0359] Example 1: Exemplarily, the carrier selected by the UE for CA transmission is: The carrier is in a set of carriers available for CA transmission / SL transmission, configured / pre-configured by the network; At least one carrier is included in Set A; and The synchronization reference type parameter (sl-SyncPriority) is configured / pre-configured by the network as GNSS, and GNSS is not reliable; If at least one of the following conditions is satisfied: the synchronization reference priority order (sl-NbAsSync) of at least some carriers in the pre-configured / network-configured / UE-selected CA carrier / SL transmission carrier / multiple carriers / at least two carriers / Set A / Set B / first carrier set is different; The synchronization reference of one or more carriers included in Set A is determined, and the selection priority of the carriers is determined according to the following rules, and one of the carriers with the highest selection priority is selected as the synchronization carrier.

[0360] P1: The synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the coverage indication reference indicates that it is true / the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the SLSS is transmitted on the third set of synchronization resources. P2: A carrier where the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the SLSS is not transmitted on the third set of synchronization resources, and the coverage indication parameter indicates false. P2: A carrier in which the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 337, and the coverage indication parameter indicates false. P3: Carrier whose synchronization reference is gNB / eNB P4: A carrier in which the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE belongs to the SLSS ID set / partial set defined in the coverage, and the coverage indication parameter indicates that it is true. P5: A carrier in which the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE belongs to the SLSS ID set / partial set defined in the coverage, and the coverage indication parameter indicates false. P6: Carrier whose synchronization reference is another SyncRef UE As can be seen, the selection priority order is, from highest to lowest, P1, P2, P3, P4, P5, and P6.

[0361] The rules are as follows:

[0362] When the selection priority corresponding to at least one carrier is P1 or P2, the UE selects, as the synchronization carrier, a carrier with a higher selection priority from among those with a corresponding selection priority of P1 to P2.

[0363] If the corresponding priorities of all the carriers are P6, the UE selects the carriers whose corresponding selection priorities are P6 as the synchronization carriers.

[0364] If the selection priority corresponding to all carriers configured with sl-NbAsSync false is P6, and the selection priority corresponding to at least one carrier configured with sl-NbAsSync true is P3, P4, or P5, the UE selects the carrier whose corresponding selection priority is P6 as the synchronization carrier.

[0365] Exemplarily, the above selection priority order is obtained based on the synchronization reference priority, for example, a carrier having a higher synchronization reference priority corresponds to a higher selection priority.

[0366] The flow of determining the synchronization carrier based on the synchronization reference priority order will be described with the following example.

[0367] Example 2: Exemplarily, the carrier selected by the UE for CA transmission is: The carrier is in a set of carriers available for CA transmission / SL transmission, configured / pre-configured by the network; At least one carrier is included in Set A; and The synchronization reference type parameter (sl-SyncPriority) is configured / pre-configured by the network as GNSS, and GNSS is not reliable; If at least one of the following conditions is satisfied: the synchronization reference priority order (sl-NbAsSync) of at least some carriers in the pre-configured / network-configured / UE-selected CA carrier / SL transmission carrier / multiple carriers / at least two carriers / Set A / Set B / first carrier set is different; The synchronization reference of one or more carriers included in Set A is determined, and the selection priority of the carriers is determined according to the following rules, and one of the carriers with the highest selection priority is selected as the synchronization carrier.

[0368] P1: The synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the coverage indication reference indicates that it is true / the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the SLSS is transmitted on the third set of synchronization resources. P2: A carrier where the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the SLSS is not transmitted on the third set of synchronization resources, and the coverage indication parameter indicates false. P2: A carrier in which the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 337, and the coverage indication parameter indicates false. P3: Carrier whose synchronization reference is gNB / eNB P4: A carrier in which the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE belongs to the SLSS ID set / partial set defined in the coverage, and the coverage indication parameter indicates that it is true. P5: A carrier in which the synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE belongs to the SLSS ID set / partial set defined in the coverage, and the coverage indication parameter indicates false. P6: Carrier whose synchronization reference is another SyncRef UE As can be seen, the selection priority order is, from highest to lowest, P1, P2, P3, P4, P5, and P6.

[0369] The rules are as follows:

[0370] Exemplarily, the conditions for determining the selection priority include, when there is an overlap in the synchronization reference priority order and the selection priority corresponding to a carrier with a higher synchronization reference priority in the overlap is high, if the priorities corresponding to at least one carrier are P1, P2, and P6, the UE selects a carrier with a higher selection priority from those corresponding to selection priorities P1, P2, and P6 as a synchronization carrier.

[0371] Exemplarily, the conditions for determining the selection priority include: when there is an overlap in the synchronization reference priority order and the selection priority corresponding to a carrier with a high synchronization reference priority in the non-overlapping part is high, if there is no carrier with a corresponding selection priority of P1, P2, P6, i.e., the selection priorities corresponding to all carriers are P3, P4, P5, the UE selects a carrier with a high selection priority from those with a corresponding selection priority of P3, P4, P5 as the synchronization carrier.

[0372] Example 3: The carrier selected by the UE for CA transmission is The carrier is in a set of carriers available for CA transmission / SL transmission, configured / pre-configured by the network; At least one carrier is included in Set A; and The synchronization reference type parameter (sl-SyncPriority) is configured / pre-configured by the network as GNSS, and GNSS is not reliable; If at least one of the following conditions is satisfied: the synchronization reference priority order (sl-NbAsSync) of at least some carriers in the pre-configured / network-configured / UE-selected CA carrier / SL transmission carrier / multiple carriers / at least two carriers / Set A / Set B / first carrier set is different; Determine the synchronization reference of one or more carriers included in Set A, and the UE selects a carrier with a higher synchronization reference priority as the synchronization carrier. If there is a mismatch between the synchronization reference determined by one carrier and the allowable synchronization reference obtained based on the synchronization reference priority order configured by the carriers, determine the synchronization reference for each carrier respectively.

[0373] In the carrier determination method according to the embodiment of the present application, the execution body may be a carrier determination device. In the embodiment of the present application, the carrier determination device according to the embodiment of the present application is taken as an example to execute the carrier determination method.

[0374] FIG. 3 shows a carrier determination apparatus according to an embodiment of the present application, the apparatus 300 including: Wherein, the determining module 301 is used for determining a second carrier and / or a plurality of third carriers from a plurality of first carriers according to first information of at least a portion of the carriers; wherein the second carrier is used to determine second carrier synchronization information and / or fourth carrier synchronization information; the third carriers are used for sidelink (SL) transmission, the plurality of first carriers satisfy a first condition; The third carriers satisfy a second condition.

[0375] In some possible embodiments, the first condition is: At least some of the carriers have the same synchronization reference order, or at least some of the carriers have different synchronization reference orders; The synchronization reference priority indication information of at least some of the carriers is the same, or the synchronization reference priority indication information of at least some of the carriers is different; The first instruction information of at least some of the carriers is the same, or the first instruction information of at least some of the carriers is different; The HARQ configurations of at least some of the carriers are the same, or the HARQ configurations of at least some of the carriers are different; The PSFCH configurations of at least some carriers are the same, or the PSFCH configurations of at least some carriers are different; At least some of the carriers have the same SCS configuration or at least some of the carriers have different SCS configurations; The synchronization resources corresponding to at least some of the carriers are the same, or the synchronization resources corresponding to at least some of the carriers are different; and The starting symbols of at least some of the carriers are the same or the starting symbols of at least some of the carriers are different; At least one of the following is included: the number of occupied symbols of at least some of the carriers is the same; or the number of occupied symbols of at least some of the carriers is different; Here, the first instruction information is Whether at least one specific synchronization reference needs to be monitored, Whether at least one particular synchronous reference needs to be skipped, and whether to directly or indirectly synchronize to at least one particular synchronization reference; The HARQ configuration is used to indicate whether HARQ is enabled; The PSFCH configuration includes at least one of a period of the PSFCH, a time domain position of the PSFCH, a frequency domain position of the PSFCH, configuration information indicating whether to configure a PSFCH resource, and a minimum interval between data and a corresponding PSFCH for feeding back the data; The synchronization resource includes at least one of a period of a synchronization signal, a number of synchronization slots in the period of the synchronization signal, a number of repetitions of the synchronization signal, a synchronization slot offset amount, a time interval of the synchronization signal, and an SCS; The SCS includes at least one of an SCS of a synchronization signal and an SCS of a carrier.

[0376] In some possible embodiments, the second condition is: The synchronization reference order of at least some of the carriers is the same; and The synchronization reference priority indication information of at least some of the carriers is the same; and The first instruction information of at least some of the carriers is the same; The HARQ configurations of at least some of the carriers are the same; and The PSFCH configurations of at least some of the carriers are the same; and At least some carriers have the same SCS configuration, The synchronization resources included in at least some of the carriers are the same; and At least some of the carriers have the same starting symbol, and the number of occupied symbols of at least some of the carriers is the same; Here, the first instruction information is Whether at least one specific synchronization reference needs to be monitored, Whether at least one particular synchronous reference needs to be skipped, and whether to directly or indirectly synchronize to at least one particular synchronization reference; The HARQ configuration is used to indicate whether HARQ is enabled; The PSFCH configuration includes at least one of a period of the PSFCH, a time domain position of the PSFCH, a frequency domain position of the PSFCH, configuration information indicating whether to configure a PSFCH resource, and a minimum interval between data and a corresponding PSFCH for feeding back the data; The synchronization resource includes at least one of a period of a synchronization signal, a number of synchronization slots in the period of the synchronization signal, a number of repetitions of the synchronization signal, a synchronization slot offset amount, a time interval of the synchronization signal, and an SCS; The SCS includes at least one of an SCS of a synchronization signal and an SCS of a carrier.

[0377] In some possible embodiments, the first information comprises: Synchronous reference order; Synchronous reference priority indication information; A first instruction; HARQ configuration; PSFCH configuration; SCS configuration and The included synchronization resource; A start symbol, and the number of occupied symbols.

[0378] Here, the first instruction information is Whether at least one specific synchronization reference needs to be monitored, Whether at least one particular synchronous reference needs to be skipped, and whether to directly or indirectly synchronize to at least one particular synchronization reference; The synchronous reference order is: a priority or priority group order for synchronization references; The priority order of the services; A priority order of the synchronization resources; Signal strength order; and the order of the searched time, The HARQ configuration is used to indicate whether HARQ is enabled; The PSFCH configuration includes at least one of a period of the PSFCH, a time domain position of the PSFCH, a frequency domain position of the PSFCH, configuration information indicating whether to configure a PSFCH resource, and a minimum interval between data and a corresponding PSFCH for feeding back the data; The synchronization resource includes at least one of a period of a synchronization signal, a number of synchronization slots in the period of the synchronization signal, a number of repetitions of the synchronization signal, a synchronization slot offset amount, a time interval of the synchronization signal, and an SCS; The SCS includes at least one of an SCS of a synchronization signal and an SCS of a carrier.

[0379] In some possible embodiments, the plurality of first carriers include: A plurality of carriers used for CA transmission; A plurality of carriers used in multicarrier transmission; A plurality of carriers used for SL transmission; a first carrier set; A second carrier aggregation; and a third carrier set; Here, the second carrier set includes carriers that may be used as synchronization carriers, and the third carrier set includes a set of available synchronization carriers.

[0380] In some possible embodiments, the determination module 301 is specifically used for determining a second carrier from a plurality of first carriers based on a first rule.

[0381] Here, the first rule is: determining the second carrier based on a selection priority; determining a carrier whose signal quality satisfies a first condition as the second carrier; determining a carrier whose searched time satisfies a second condition as the second carrier; determining a carrier whose synchronization reference type priority satisfies a third condition as the second carrier; determining a carrier on which a HARQ configuration is enabled or not enabled as the second carrier; determining a carrier whose period of a PSFCH configuration satisfies a fourth condition as the second carrier; determining a carrier in which a resource pool satisfies a fifth condition as the second carrier; determining a carrier whose second priority satisfies a sixth condition as the second carrier; and determining a carrier whose synchronization resource satisfies a seventh condition as the second carrier; Here, the second priority is: A priority or priority group of the synchronization reference; Service priority and and a priority of the synchronization resource; The synchronization resource is: The period of the synchronization signal; the number of synchronization slots within the period of the synchronization signal; The number of repetitions of the synchronization signal; A synchronous slot offset amount; the time interval of the synchronization signal; and an SCS, the SCS including at least one of an S-SSB SCS and a carrier SCS.

[0382] In some possible embodiments, the carrier that satisfies the first condition is: The carrier with the strongest signal, The carrier with the weakest signal strength, and a carrier having a signal strength at a first threshold; and / or Carriers that meet the second condition above are: The carrier with the earliest search time, The carrier with the latest search time, and a carrier where the searched time is a predetermined time, and / or Carriers that meet the third condition above are: The carrier with the highest priority for the synchronization reference type; The carrier with the lowest synchronization reference type priority; and a carrier having a synchronization reference type priority of a predetermined synchronization reference priority; and / or Carriers that meet the fourth condition above are: The carrier with the largest period of the PSFCH configuration, The carrier with the smallest period of the PSFCH configuration, and a carrier in which the period of the PSFCH configuration is a first predetermined period; and / or Carriers that meet the fifth condition above are: a carrier including at least one resource pool having a PSFCH resource; A carrier including at least one resource pool that does not have a PSFCH resource; A carrier including a resource pool in which no PSFCH resource is present; and a carrier including a resource pool having PSFCH resources; and / or A carrier that meets the sixth condition above is: The carrier with the highest priority, The carrier with the lowest priority, and a carrier having a predetermined priority.

[0383] Carriers that meet the seventh condition above are: The carrier with the largest period of the synchronization signal, The carrier with the smallest period of the synchronization signal, a carrier having a synchronization signal with a second predetermined period; The carrier with the largest number of synchronous slots in a period, The carrier with the smallest number of synchronization slots in a period, A carrier having a predetermined number of synchronous slots in a period; The carrier with the highest number of repetitions of the synchronization signal, The carrier with the smallest number of repetitions of the synchronization signal; a carrier having a synchronization signal repetition number of a predetermined number; The carrier with the largest synchronous slot offset, The carrier with the smallest synchronous slot offset, A carrier having a synchronous slot offset of a predetermined offset amount; The carrier with the largest time interval between synchronization signals, A carrier having a synchronization signal with a predetermined time interval; The carrier with the largest SCS and The carrier with the smallest SCS and and a carrier, the SCS being a given SCS.

[0384] In some possible embodiments, the selection priority is: Selection priority relations; The selection priority order is determined based on at least one of the following:

[0385] In some possible embodiments, determining the second carrier based on a selection priority includes: determining a carrier having the highest selection priority as the second carrier; determining a carrier having a selection priority higher than a first predetermined selection priority as the second carrier; determining a carrier having a lowest selection priority as the second carrier; determining a carrier having a selection priority lower than a second predetermined selection priority as the second carrier; determining a carrier having a third selection priority as the second carrier.

[0386] In some possible embodiments, the selection priority is: The Protocol provides for: A network comprising: A pre-configured Instructed by the network; Synchronous reference priority indication information; A first instruction; Synchronous reference order; A synchronous reference type, A synchronization parameter configuration method; The second priority, HARQ configuration; PSFCH configuration; SCS configuration and Synchronization resources; A carrier frequency point; The carrier index is determined based on at least one of the above.

[0387] In some possible embodiments, the selection priority order is: Synchronous reference priority indication information; A first instruction; Synchronous reference order; A synchronous reference type, A synchronization parameter configuration method; The second priority, HARQ configuration; PSFCH configuration; SCS configuration and Synchronization resources; A carrier frequency point; The carrier index is determined based on at least one of the carrier indexes.

[0388] In some possible embodiments, the first instruction information comprises: Whether at least one specific synchronization reference needs to be monitored, Whether at least one particular synchronous reference needs to be skipped, and whether to directly or indirectly synchronize to at least one particular synchronization reference; and / or The synchronous reference order is: a priority or priority group order for synchronization references; The priority order of the services; A priority order of the synchronization resources; Signal strength order; and the order of the searched time, and / or The synchronization reference type includes at least one of a gNB, an eNB, a GNSS, a UE, and a UE internal clock; and / or The synchronization parameter configuration method includes at least one of network configuration and pre-configuration; and / or The second priority is: A priority or priority group of the synchronization reference; Service priority and and a priority of the synchronization resource; and / or The HARQ configuration is used to indicate whether HARQ is enabled; and / or The PSFCH configuration includes at least one of a period of the PSFCH, a time domain position of the PSFCH, a frequency domain position of the PSFCH, configuration information indicating whether to configure a PSFCH resource, and a minimum interval between data and a corresponding PSFCH for feeding back the data; and / or The synchronization resource is: The period of the synchronization signal; the number of synchronization slots within the period of the synchronization signal; The number of repetitions of the synchronization signal; A synchronous slot offset amount; the time interval of the synchronization signal; and an SCS, the SCS including at least one of an S-SSB SCS and a carrier SCS.

[0389] In some possible embodiments, the selection priority order is: A carrier synchronization reference order; When the synchronization reference order of the carrier includes an overlapping portion, a first order corresponding to the overlapping portion; When the synchronization reference order of the carrier includes an overlapping portion, a synchronization reference order corresponding to a non-overlapping portion other than the overlapping portion; The carrier arrangement order is determined based on at least one of the above.

[0390] In some possible embodiments, the selection priority order is: A selection priority corresponding to a carrier having a high synchronization reference priority is higher than a selection priority corresponding to a carrier having a low synchronization reference priority, or is lower than a selection priority corresponding to a carrier having a low synchronization reference priority; The synchronization reference priority order corresponding to the carrier includes an overlapping portion, and a selection priority corresponding to a carrier having a high synchronization reference priority in the overlapping portion is higher than a selection priority corresponding to a carrier having a low synchronization reference priority in the overlapping portion, or is lower than a selection priority corresponding to a carrier having a low synchronization reference priority in the overlapping portion; The synchronization reference priority order corresponding to the carriers includes an overlapping portion, and the selection priority corresponding to a carrier having a high synchronization reference priority in the non-overlapping portion other than the overlapping portion is higher than the selection priority corresponding to a carrier having a low synchronization reference priority in the non-overlapping portion, or is lower than the selection priority corresponding to a carrier having a low synchronization reference priority in the non-overlapping portion.

[0391] In some possible embodiments, the selection priority order is: a selection priority corresponding to a carrier of a first synchronization reference is higher or lower than a selection priority corresponding to a carrier of a second synchronization reference, the procedure of the first synchronization reference is higher than the procedure of the second synchronization reference, and / or the first synchronization reference is a predetermined synchronization reference; A selection priority corresponding to a carrier having a first HARQ configuration is higher or lower than a selection priority corresponding to a carrier having another HARQ configuration other than the first HARQ configuration, and the first HARQ configuration is a predetermined HARQ configuration; A selection priority corresponding to a carrier having a first PSFCH configuration is higher or lower than a selection priority corresponding to a carrier having a second PSFCH configuration; The selection priority corresponding to a carrier of a first SCS is higher or lower than a selection priority corresponding to a carrier of a second SCS, or the first SCS is higher than the second SCS, and / or the first SCS is a predetermined SCS.

[0392] In some possible embodiments, the first PSFCH configuration and the second PSFCH configuration are: A periodicity of the first PSFCH configuration is greater than a periodicity of the second PSFCH configuration; A periodicity of the first PSFCH configuration is smaller than a periodicity of the second PSFCH configuration; the first PSFCH configuration being a predetermined PSFCH configuration; At least one of the following is satisfied: the carrier having the first PSFCH configuration is a carrier having PSFCH resources, and the carrier having the second PSFCH configuration is a carrier having no PSFCH resources, or the carrier having the first PSFCH configuration is a carrier having no PSFCH resources, and the carrier having the second PSFCH configuration is a carrier having PSFCH resources.

[0393] In some possible embodiments, the selection priority order is: a selection priority corresponding to a carrier of a first synchronization signal is higher or lower than a selection priority corresponding to a carrier of a second synchronization signal, the period of the first synchronization signal is larger than the period of the second synchronization signal, and / or the period of the first synchronization signal is a third predetermined period; a selection priority corresponding to a carrier having a first number of synchronization slots per period is higher or lower than a selection priority corresponding to a carrier having a second number of synchronization slots per period, said first value being higher than said second value, and / or said first value being a first predetermined value; a selection priority corresponding to a carrier having a third value of repetition of a synchronization signal is higher or lower than a selection priority corresponding to a carrier having a fourth value of repetition of a synchronization signal, the third value being higher than the fourth value, and / or the third value being a second predetermined value; A selection priority corresponding to a carrier with a first synchronization slot offset is higher or lower than a selection priority corresponding to a carrier with a second synchronization slot offset, the first synchronization slot offset is larger than the second synchronization slot offset, and / or the first synchronization slot offset is a predetermined synchronization slot offset; The selection priority corresponding to a carrier of a first time interval of the synchronization signal is higher or lower than a selection priority corresponding to a carrier of a second time interval, the first time interval being larger than the second time interval, and / or the first time interval being a predetermined time interval.

[0394] In some possible embodiments, the first carrier set comprises: a carrier in a second carrier set; a carrier in the third carrier set; All carriers that can be used for carrier aggregation CA transmission; The carriers actually used for CA transmission, The carriers that were once selected for CA transmission, All carriers that can be used in multicarrier transmission; Carriers actually used in multicarrier transmission, The carriers that were once selected for multi-carrier transmission, All carriers that can be used for SL transmission; The carriers actually used for SL transmission, The carriers once selected for SL transmission, and a carrier including synchronization resources; Here, the second carrier set includes carriers that may be used as synchronization carriers, and the third carrier set includes a set of available synchronization carriers.

[0395] In some possible embodiments, the fourth carrier comprises: a carrier in a second carrier set; a carrier in the third carrier set; All carriers that can be used for carrier aggregation CA transmission; The carriers actually used for CA transmission, The carriers that were once selected for CA transmission, All carriers that can be used in multicarrier transmission; Carriers actually used in multicarrier transmission, The carriers that were once selected for multi-carrier transmission, All carriers that can be used for SL transmission; The carriers actually used for SL transmission, The carriers once selected for SL transmission, and a carrier including synchronization resources; Here, the second carrier set includes carriers that can be used as synchronization carriers, and the third carrier set includes a set of available synchronization carriers.

[0396] In the carrier determination device according to the embodiment of the present application, the device determines a second carrier and / or a third carrier from a plurality of first carriers based on first information of at least some of the first carriers, where the second carrier is used to determine synchronization information of the second carrier and / or synchronization information of a fourth carrier, and the third carriers are used to perform sidelink SL transmission, and the first carriers satisfy a first condition, and the third carriers satisfy a second condition. According to this method, a terminal can determine a second carrier, determine synchronization information of itself and other carriers via the second carrier, and perform sidelink transmission via the third carrier, thus realizing timing synchronization when each carrier performs sidelink data transmission, thereby improving the reliability of the communication system.

[0397] The determining device in the embodiment of the present application may be an electronic device, for example an electronic device having an operating system, or may be a component in an electronic device, for example an integrated circuit or chip. The electronic device may be a terminal or other devices other than a terminal. Exemplarily, the terminal may include, but is not limited to, the types of terminal 11 listed above, and the other devices may be servers, network attached storage (NAS), etc., and the embodiment of the present application is not specifically limited.

[0398] The carrier determination device according to the embodiments of the present application can realize each process realized by the method embodiments of Figures 1 and 2, and achieve the same technical effects, and will not be described further here in order to avoid repetition of description.

[0399] Optionally, as shown in Fig. 4, the embodiment of the present application further provides a communication device 400, which includes a processor 401 and a memory 402, and the memory 402 stores a program or instruction that can run on the processor 401, for example, when the communication device 400 is a terminal, the program or instruction can be executed by the processor 401 to realize each step of the embodiment of the carrier determination method and achieve the same technical effect. When the communication device 400 is a network side device, the program or instruction can be executed by the processor 401 to realize each step of the embodiment of the carrier determination method and achieve the same technical effect, and in order to avoid repetition, no further description will be given here.

[0400] The embodiment of the present application further provides a terminal, which includes a processor and a communication interface, and the processor is used to determine a second carrier from a plurality of first carriers according to first information of at least some carriers among the plurality of first carriers, where the second carrier is used to determine synchronization information of the second carrier and / or synchronization information of a third carrier, and / or the second carrier is used to perform sidelink SL transmission. The embodiment of the terminal corresponds to the embodiment of the method on the terminal side, and each implementation process and realization manner of the embodiment of the method can be applied to the embodiment of the terminal, and the same technical effects can be achieved. Specifically, FIG. 5 is a schematic diagram of a hardware structure for realizing the terminal of the embodiment of the present application.

[0401] The terminal 500 includes at least some of the following components, but is not limited to: a radio frequency unit 501, a network module 502, an audio output unit 503, an input unit 504, a sensor 505, a display unit 506, a user input unit 507, an interface unit 508, a memory 509, and a processor 510.

[0402] As can be understood by those skilled in the art, the terminal 500 may further include a power source (e.g., a battery) for powering each component, and the power source may be logically connected to the processor 510 by a power management system, so that the power management system can realize functions such as charge / discharge management and power consumption management. The structure of the terminal shown in FIG. 5 does not constitute a limitation on the terminal, and the terminal may include more or less components than the number of components shown, or a combination of some components, or a different configuration of components, which will not be further described here.

[0403] It should be understood that in the embodiment of the present application, the input unit 504 may include a graphics processing unit (GPU) 5041 and a microphone 5042, and the graphics processor 5041 processes image data of still or video images obtained by an image capture device (e.g., a camera) in a video capture mode or an image capture mode. The display unit 506 may include a display panel 5061, and the display panel 5061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 507 includes at least one of a touch panel 5071 and other input devices 5072. The touch panel 5071 is also called a touch screen. The touch panel 5071 may include two parts: a touch detection device and a touch controller. The other input devices 5072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control buttons, switch buttons, etc.), a trackball, a mouse, and an operation lever, which will not be further described here.

[0404] In the embodiment of the present application, the radio frequency unit 501 can receive downlink data from the network side device, and then transmit the data to the processor 510 for processing, and can transmit uplink data to the network side device. In general, the radio frequency unit 501 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

[0405] The memory 509 may be used to store software programs or instructions and various data. The memory 509 may include a first storage area that mainly stores programs or instructions and a second storage area that stores data, where the first storage area can store an operating system, an application program or instructions required for at least one function (e.g., a sound playback function, an image playback function, etc.), etc. The memory 509 may include a volatile memory or a non-volatile memory, or the memory 509 may include both volatile and non-volatile memory. Here, 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 Random Access Memory (RAM), Static Random Access Memory (Static RAM, SRAM), Dynamic Random Access Memory (DRAM, DRAM), Synchronous Dynamic Random Access Memory (Synchronous DRAM, SDRAM), Double Data Rate Synchronous Dynamic Random Access Memory (Double Data Rate SDRAM, DDRSDRAM), Enhanced Synchronous Dynamic Random Access Memory (Enhanced SDRAM, ESDRAM), Synch link Dynamic Random Access Memory (Synch link DRAM, SLDRAM), and Direct Rambus Random Access Memory (Direct Rambus RAM, DRRAM). Memory 509 in embodiments of the present application may include, but is not limited to, these and any other suitable types of memory.

[0406] The processor 510 may include one or more processing units. Optionally, the processor 510 integrates an application processor and a modem processor, where the application processor mainly processes operations related to the operating system, user interface, and application programs, etc., and the modem processor mainly processes wireless communication signals, e.g., a baseband processor. As can be understood, the modem processor may not be integrated into the processor 510.

[0407] Wherein, the processor 510 is used to determine a second carrier and / or a plurality of third carriers from the plurality of first carriers according to first information of at least some carriers among the plurality of first carriers; wherein the second carrier is used to determine second carrier synchronization information and / or fourth carrier synchronization information; the third carriers are used for sidelink (SL) transmission, the plurality of first carriers satisfy a first condition; The third carriers satisfy a second condition.

[0408] In some possible embodiments, the first condition is: At least some of the carriers have the same synchronization reference order, or at least some of the carriers have different synchronization reference orders; The synchronization reference priority indication information of at least some of the carriers is the same, or the synchronization reference priority indication information of at least some of the carriers is different; The first instruction information of at least some of the carriers is the same, or the first instruction information of at least some of the carriers is different; The HARQ configurations of at least some of the carriers are the same, or the HARQ configurations of at least some of the carriers are different; The PSFCH configurations of at least some carriers are the same, or the PSFCH configurations of at least some carriers are different; At least some of the carriers have the same SCS configuration or at least some of the carriers have different SCS configurations; The synchronization resources corresponding to at least some of the carriers are the same, or the synchronization resources corresponding to at least some of the carriers are different; and The starting symbols of at least some of the carriers are the same or the starting symbols of at least some of the carriers are different; At least one of the following is included: the number of occupied symbols of at least some of the carriers is the same; or the number of occupied symbols of at least some of the carriers is different; Here, the first instruction information is Whether at least one specific synchronization reference needs to be monitored, Whether at least one particular synchronous reference needs to be skipped, and whether to directly or indirectly synchronize to at least one particular synchronization reference; The HARQ configuration is used to indicate whether HARQ is enabled; The PSFCH configuration includes at least one of a period of the PSFCH, a time domain position of the PSFCH, a frequency domain position of the PSFCH, configuration information indicating whether to configure a PSFCH resource, and a minimum interval between data and a corresponding PSFCH for feeding back the data; The synchronization resource includes at least one of a period of a synchronization signal, a number of synchronization slots in the period of the synchronization signal, a number of repetitions of the synchronization signal, a synchronization slot offset amount, a time interval of the synchronization signal, and an SCS; The SCS includes at least one of an SCS of a synchronization signal and an SCS of a carrier.

[0409] In some possible embodiments, the second condition is: The synchronization reference order of at least some of the carriers is the same; and The synchronization reference priority indication information of at least some of the carriers is the same; and The first instruction information of at least some of the carriers is the same; The HARQ configurations of at least some of the carriers are the same; and The PSFCH configurations of at least some of the carriers are the same; and At least some carriers have the same SCS configuration, The synchronization resources included in at least some of the carriers are the same; and At least some of the carriers have the same starting symbol, and the number of occupied symbols of at least some of the carriers is the same; Here, the first instruction information is Whether at least one specific synchronization reference needs to be monitored, Whether at least one particular synchronous reference needs to be skipped, and whether to directly or indirectly synchronize to at least one particular synchronization reference; The HARQ configuration is used to indicate whether HARQ is enabled; The PSFCH configuration includes at least one of a period of the PSFCH, a time domain position of the PSFCH, a frequency domain position of the PSFCH, configuration information indicating whether to configure a PSFCH resource, and a minimum interval between data and a corresponding PSFCH for feeding back the data; The synchronization resource includes at least one of a period of a synchronization signal, a number of synchronization slots in the period of the synchronization signal, a number of repetitions of the synchronization signal, a synchronization slot offset amount, a time interval of the synchronization signal, and an SCS; The SCS includes at least one of an SCS of a synchronization signal and an SCS of a carrier.

[0410] In some possible embodiments, the first information comprises: Synchronous reference order; Synchronous reference priority indication information; A first instruction; HARQ configuration; PSFCH configuration; SCS configuration and The included synchronization resource; A start symbol, and the number of occupied symbols.

[0411] Here, the first instruction information is Whether at least one specific synchronization reference needs to be monitored, Whether at least one particular synchronous reference needs to be skipped, and whether to directly or indirectly synchronize to at least one particular synchronization reference; The synchronous reference order is: a priority or priority group order for synchronization references; The priority order of the services; A priority order of the synchronization resources; Signal strength order; and the order of the searched time, The HARQ configuration is used to indicate whether HARQ is enabled; The PSFCH configuration includes at least one of a period of the PSFCH, a time domain position of the PSFCH, a frequency domain position of the PSFCH, configuration information indicating whether to configure a PSFCH resource, and a minimum interval between data and a corresponding PSFCH for feeding back the data; The synchronization resource includes at least one of a period of a synchronization signal, a number of synchronization slots in the period of the synchronization signal, a number of repetitions of the synchronization signal, a synchronization slot offset amount, a time interval of the synchronization signal, and an SCS; The SCS includes at least one of an SCS of a synchronization signal and an SCS of a carrier.

[0412] In some possible embodiments, the plurality of first carriers include: A plurality of carriers used for CA transmission; A plurality of carriers used in multicarrier transmission; A plurality of carriers used for SL transmission; a first carrier set; A second carrier aggregation; and a third carrier set; Here, the second carrier set includes carriers that may be used as synchronization carriers, and the third carrier set includes a set of available synchronization carriers.

[0413] In some possible embodiments, the processor 510 is specifically adapted to determine the second carrier from the plurality of first carriers based on a first rule.

[0414] Here, the first rule is: determining the second carrier based on a selection priority; determining a carrier whose signal quality satisfies a first condition as the second carrier; determining a carrier whose searched time satisfies a second condition as the second carrier; determining a carrier whose synchronization reference type priority satisfies a third condition as the second carrier; determining a carrier on which a HARQ configuration is enabled or not enabled as the second carrier; determining a carrier whose period of a PSFCH configuration satisfies a fourth condition as the second carrier; determining a carrier in which a resource pool satisfies a fifth condition as the second carrier; determining a carrier whose second priority satisfies a sixth condition as the second carrier; and determining a carrier whose synchronization resource satisfies a seventh condition as the second carrier; Here, the second priority is: A priority or priority group of the synchronization reference; Service priority and and a priority of the synchronization resource; The synchronization resource is: The period of the synchronization signal; the number of synchronization slots within the period of the synchronization signal; The number of repetitions of the synchronization signal; A synchronous slot offset amount; the time interval of the synchronization signal; and an SCS, the SCS including at least one of an S-SSB SCS and a carrier SCS.

[0415] In some possible embodiments, the carrier that satisfies the first condition is: The carrier with the strongest signal, The carrier with the weakest signal strength, and a carrier having a signal strength at a first threshold; and / or Carriers that meet the second condition above are: The carrier with the earliest search time, The carrier with the latest search time, and a carrier where the searched time is a predetermined time, and / or Carriers that meet the third condition above are: The carrier with the highest priority for the synchronization reference type; The carrier with the lowest synchronization reference type priority; and a carrier having a synchronization reference type priority of a predetermined synchronization reference priority; and / or Carriers that meet the fourth condition above are: The carrier with the largest period of the PSFCH configuration, The carrier with the smallest period of the PSFCH configuration, and a carrier in which the period of the PSFCH configuration is a first predetermined period; and / or Carriers that meet the fifth condition above are: a carrier including at least one resource pool having a PSFCH resource; A carrier including at least one resource pool that does not have a PSFCH resource; A carrier including a resource pool in which no PSFCH resource is present; and a carrier including a resource pool having PSFCH resources; and / or A carrier that meets the sixth condition above is: The carrier with the highest priority, The carrier with the lowest priority, and a carrier having a predetermined priority.

[0416] In some possible embodiments, the carrier that satisfies the seventh condition is: The carrier with the largest period of the synchronization signal, The carrier with the smallest period of the synchronization signal, a carrier having a synchronization signal with a second predetermined period; The carrier with the largest number of synchronous slots in a period, The carrier with the smallest number of synchronization slots in a period, A carrier having a predetermined number of synchronous slots in a period; The carrier with the highest number of repetitions of the synchronization signal, The carrier with the smallest number of repetitions of the synchronization signal; a carrier having a synchronization signal repetition number of a predetermined number; The carrier with the largest synchronous slot offset, The carrier with the smallest synchronous slot offset, A carrier having a synchronous slot offset of a predetermined offset amount; The carrier with the largest time interval between synchronization signals, A carrier having a synchronization signal with a predetermined time interval; The carrier with the largest SCS and The carrier with the smallest SCS and and a carrier, the SCS being a given SCS.

[0417] In some possible embodiments, the selection priority is: Selection priority relations; The selection priority order is determined based on at least one of the following:

[0418] In some possible embodiments, determining the second carrier based on a selection priority includes: determining a carrier having the highest selection priority as the second carrier; determining a carrier having a selection priority higher than a first predetermined selection priority as the second carrier; determining a carrier having a lowest selection priority as the second carrier; determining a carrier having a selection priority lower than a second predetermined selection priority as the second carrier; determining a carrier having a third selection priority as the second carrier.

[0419] In some possible embodiments, the selection priority is: The Protocol provides for: A network comprising: A pre-configured Instructed by the network; Synchronous reference priority indication information; A first instruction; Synchronous reference order; A synchronous reference type, A synchronization parameter configuration method; The second priority, HARQ configuration; PSFCH configuration; SCS configuration and Synchronization resources; A carrier frequency point; The carrier index is determined based on at least one of the above.

[0420] In some possible embodiments, the selection priority order is: Synchronous reference priority indication information; A first instruction; Synchronous reference order; A synchronous reference type, A synchronization parameter configuration method; The second priority, HARQ configuration; PSFCH configuration; SCS configuration and Synchronization resources; A carrier frequency point; The carrier index is determined based on at least one of the above.

[0421] In some possible embodiments, the first instruction information comprises: Whether at least one specific synchronization reference needs to be monitored, Whether at least one particular synchronous reference needs to be skipped, and whether to directly or indirectly synchronize to at least one particular synchronization reference; and / or The synchronous reference order is: a priority or priority group order for synchronization references; The priority order of the services; A priority order of the synchronization resources; Signal strength order; and the order of the searched time, and / or The synchronization reference type includes at least one of a gNB, an eNB, a GNSS, a UE, and a UE internal clock; and / or The synchronization parameter configuration method includes at least one of network configuration and pre-configuration; and / or The second priority is: A priority or priority group of the synchronization reference; Service priority and and a priority of the synchronization resource; and / or The HARQ configuration is used to indicate whether HARQ is enabled; and / or The PSFCH configuration includes at least one of a period of the PSFCH, a time domain position of the PSFCH, a frequency domain position of the PSFCH, configuration information indicating whether to configure a PSFCH resource, and a minimum interval between data and a corresponding PSFCH for feeding back the data; and / or The synchronization resource is: The period of the synchronization signal; the number of synchronization slots within the period of the synchronization signal; The number of repetitions of the synchronization signal; A synchronous slot offset amount; the time interval of the synchronization signal; and an SCS, the SCS including at least one of an S-SSB SCS and a carrier SCS.

[0422] In some possible embodiments, the selection priority order is: A carrier synchronization reference order; When the synchronization reference order of the carrier includes an overlapping portion, a first order corresponding to the overlapping portion; When the synchronization reference order of the carrier includes an overlapping portion, a synchronization reference order corresponding to a non-overlapping portion other than the overlapping portion; The carrier arrangement order is determined based on at least one of the above.

[0423] In some possible embodiments, the selection priority order is: A selection priority corresponding to a carrier having a high synchronization reference priority is higher than a selection priority corresponding to a carrier having a low synchronization reference priority, or is lower than a selection priority corresponding to a carrier having a low synchronization reference priority; The synchronization reference priority order corresponding to the carrier includes an overlapping portion, and a selection priority corresponding to a carrier having a high synchronization reference priority in the overlapping portion is higher than a selection priority corresponding to a carrier having a low synchronization reference priority in the overlapping portion, or is lower than a selection priority corresponding to a carrier having a low synchronization reference priority in the overlapping portion; The synchronization reference priority order corresponding to the carriers includes an overlapping portion, and the selection priority corresponding to a carrier having a high synchronization reference priority in the non-overlapping portion other than the overlapping portion is higher than the selection priority corresponding to a carrier having a low synchronization reference priority in the non-overlapping portion, or is lower than the selection priority corresponding to a carrier having a low synchronization reference priority in the non-overlapping portion.

[0424] In some possible embodiments, the selection priority order is: a selection priority corresponding to a carrier of a first synchronization reference is higher or lower than a selection priority corresponding to a carrier of a second synchronization reference, the procedure of the first synchronization reference is higher than the procedure of the second synchronization reference, and / or the first synchronization reference is a predetermined synchronization reference; A selection priority corresponding to a carrier having a first HARQ configuration is higher or lower than a selection priority corresponding to a carrier having another HARQ configuration other than the first HARQ configuration, and the first HARQ configuration is a predetermined HARQ configuration; A selection priority corresponding to a carrier having a first PSFCH configuration is higher or lower than a selection priority corresponding to a carrier having a second PSFCH configuration; The selection priority corresponding to a carrier of a first SCS is higher or lower than a selection priority corresponding to a carrier of a second SCS, or the first SCS is higher than the second SCS, and / or the first SCS is a predetermined SCS.

[0425] In some possible embodiments, the first PSFCH configuration and the second PSFCH configuration are: A periodicity of the first PSFCH configuration is greater than a periodicity of the second PSFCH configuration; A periodicity of the first PSFCH configuration is smaller than a periodicity of the second PSFCH configuration; the first PSFCH configuration being a predetermined PSFCH configuration; At least one of the following is satisfied: the carrier having the first PSFCH configuration is a carrier having PSFCH resources, and the carrier having the second PSFCH configuration is a carrier having no PSFCH resources, or the carrier having the first PSFCH configuration is a carrier having no PSFCH resources, and the carrier having the second PSFCH configuration is a carrier having PSFCH resources.

[0426] In some possible embodiments, the selection priority order is: a selection priority corresponding to a carrier of a first synchronization signal is higher or lower than a selection priority corresponding to a carrier of a second synchronization signal, the period of the first synchronization signal is larger than the period of the second synchronization signal, and / or the period of the first synchronization signal is a third predetermined period; a selection priority corresponding to a carrier having a first number of synchronization slots per period is higher or lower than a selection priority corresponding to a carrier having a second number of synchronization slots per period, said first value being higher than said second value, and / or said first value being a first predetermined value; a selection priority corresponding to a carrier having a third value of repetition of a synchronization signal is higher or lower than a selection priority corresponding to a carrier having a fourth value of repetition of a synchronization signal, the third value being higher than the fourth value, and / or the third value being a second predetermined value; A selection priority corresponding to a carrier with a first synchronization slot offset is higher or lower than a selection priority corresponding to a carrier with a second synchronization slot offset, the first synchronization slot offset is larger than the second synchronization slot offset, and / or the first synchronization slot offset is a predetermined synchronization slot offset; The selection priority corresponding to a carrier of a first time interval of the synchronization signal is higher or lower than a selection priority corresponding to a carrier of a second time interval, the first time interval being larger than the second time interval, and / or the first time interval being a predetermined time interval.

[0427] In some possible embodiments, the first carrier set comprises: a carrier in a second carrier set; a carrier in the third carrier set; All carriers that can be used for carrier aggregation CA transmission; The carriers actually used for CA transmission, The carriers that were once selected for CA transmission, All carriers that can be used in multicarrier transmission; Carriers actually used in multicarrier transmission, The carriers that were once selected for multi-carrier transmission, All carriers that can be used for SL transmission; The carriers actually used for SL transmission, The carriers once selected for SL transmission, and a carrier including synchronization resources; Here, the second carrier set includes carriers that may be used as synchronization carriers, and the third carrier set includes a set of available synchronization carriers.

[0428] In some possible embodiments, the fourth carrier comprises: a carrier in a second carrier set; a carrier in the third carrier set; All carriers that can be used for carrier aggregation CA transmission; The carriers actually used for CA transmission, The carriers that were once selected for CA transmission, All carriers that can be used in multicarrier transmission; Carriers actually used in multicarrier transmission, The carriers that were once selected for multi-carrier transmission, All carriers that can be used for SL transmission; The carriers actually used for SL transmission, The carriers once selected for SL transmission, and a carrier including synchronization resources; Here, the second carrier set includes carriers that can be used as synchronization carriers, and the third carrier set includes a set of available synchronization carriers.

[0429] In the terminal according to the embodiment of the present application, the terminal determines a second carrier and / or a plurality of third carriers from a plurality of first carriers based on first information of at least some of the carriers, where the second carrier is used to determine synchronization information of the second carrier and / or synchronization information of the fourth carrier, and the plurality of third carriers are used to perform sidelink SL transmission, and the plurality of first carriers satisfy a first condition, and the plurality of third carriers satisfy a second condition. According to this method, the terminal can determine a second carrier, determine synchronization information of itself and other carriers via the second carrier, and perform sidelink transmission via the third carrier, thus realizing timing synchronization when each carrier performs sidelink data transmission, thereby improving the reliability of the communication system.

[0430] An embodiment of the present application further provides a readable storage medium, in which a program or instruction is stored, which, when executed by a processor, can realize each process of the embodiment of the above carrier determination method and achieve the same technical effect, and will not be described further here in order to avoid repetition of description.

[0431] Wherein, the processor is the processor in the terminal according to 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.

[0432] An embodiment of the present application further provides a chip, the chip including a processor and a communication interface, the communication interface is coupled to the processor, the processor is used to run a program or instruction and realize each process of the embodiment of the above carrier determination method, and can achieve the same technical effect, and in order to avoid repetition of description, it will not be described further here.

[0433] It should be understood that the chips referred to in the embodiments of the present application may be referred to as system level chips, system chips, chip systems, or systems on chips.

[0434] An embodiment of the present application further provides a computer program / program product, which is stored in a storage medium, and which can be executed by at least one processor to realize each process of the embodiment of the above carrier determination method and achieve the same technical effects, which will not be described further here in order to avoid repetition of description.

[0435] An embodiment of the present application further provides a communication system, which includes a terminal and a network side device, and the terminal may be used to perform steps of the carrier determination method described above.

[0436] It should be explained that in this specification, the terms "comprise", "include", or any other variants thereof are intended to cover the non-exclusive "comprise", whereby a process, method, article, or apparatus that includes a set of elements includes not only those elements, but also other elements not expressly listed or inherent to such process, method, article, or apparatus. In the absence of further limitations, an element limited by the phrase "comprises a" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes this element. It should be pointed out that the scope of the method and apparatus in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may include performing functions in an essentially simultaneous manner or in reverse order based on the functions involved, for example, the described method can be performed in a different order than described, and various steps can be added, omitted, or combined. Also, features described with reference to some examples can be combined in other examples.

[0437] From the above description of the embodiments, it is clear to those skilled in the art that the methods of the above embodiments can be realized in the form of software and a necessary general-purpose hardware platform. Of course, they can also be realized in hardware, but in many cases the former is a more preferred embodiment. In light of this understanding, the technical proposal of the present application may be substantially or the part that contributes to the prior art may be embodied in the form of a computer software product, which is stored in a storage medium (e.g., ROM / RAM, magnetic disk, optical disk) and includes some instructions for causing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0438] The above describes the embodiments of the present application in conjunction with the drawings, but the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not limiting. Those skilled in the art can take the suggestions of this application and make many forms without departing from the spirit and scope of the claims of this application, all of which belong to the protection scope of this application.

[0439] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to Chinese Patent Application No. 202210352112.8, filed in China on April 2, 2022, the entire contents of which are incorporated herein by reference.

Claims

1. A career decision method, comprising: The terminal determines a second carrier and / or a third carrier from the first carriers based on first information of at least a part of the first carriers; wherein the second carrier is used to determine second carrier synchronization information and / or fourth carrier synchronization information; the third carriers are used for transmitting a side link (SL); the plurality of first carriers satisfy a first condition; The carrier determination method, wherein the plurality of third carriers satisfy a second condition.

2. The first condition is: At least some of the carriers have the same synchronization reference order, or at least some of the carriers have different synchronization reference orders; The synchronization reference priority indication information of at least some of the carriers is the same, or the synchronization reference priority indication information of at least some of the carriers is different; The first instruction information of at least some of the carriers is the same, or the first instruction information of at least some of the carriers is different; The HARQ configurations of at least some of the carriers are the same or the HARQ configurations of at least some of the carriers are different; The PSFCH configurations of at least some of the carriers are the same or the PSFCH configurations of at least some of the carriers are different; At least some of the carriers have the same SCS configuration or at least some of the carriers have different SCS configurations; The synchronization resources corresponding to at least some of the carriers are the same, or the synchronization resources corresponding to at least some of the carriers are different; and The starting symbols of at least some of the carriers are the same or the starting symbols of at least some of the carriers are different; At least one of the following is included: the number of occupied symbols of at least some of the carriers is the same; or the number of occupied symbols of at least some of the carriers is different; Here, the first instruction information is Whether at least one specific synchronization reference needs to be monitored, Whether at least one particular synchronous reference needs to be skipped, and whether to directly or indirectly synchronize to at least one particular synchronization reference; The HARQ configuration is used to indicate whether HARQ is enabled; The PSFCH configuration includes at least one of a period of the PSFCH, a time domain location of the PSFCH, a frequency domain location of the PSFCH, configuration information indicating whether to configure a PSFCH resource, and a minimum interval between data and a corresponding PSFCH for feeding back the data; The synchronization resource includes at least one of a period of a synchronization signal, a number of synchronization slots in the period of the synchronization signal, a number of repetitions of the synchronization signal, a synchronization slot offset amount, a time interval of the synchronization signal, and an SCS; The method of claim 1 , wherein the SCS comprises at least one of a synchronization signal SCS and a carrier SCS.

3. The second condition is: The synchronization reference order of at least some of the carriers is the same; and The synchronization reference priority indication information of at least some of the carriers is the same; and The first instruction information of at least some of the carriers is the same; The HARQ configurations of at least some of the carriers are the same; and The PSFCH configurations of at least some carriers are the same; and At least some of the carriers have the same SCS configuration; The synchronization resources included in at least some of the carriers are the same; and At least some of the carriers have the same starting symbol, and the number of occupied symbols of at least some of the carriers is the same; Here, the first instruction information is Whether at least one specific synchronization reference needs to be monitored, Whether at least one particular synchronous reference needs to be skipped, and whether to directly or indirectly synchronize to at least one particular synchronization reference; The HARQ configuration is used to indicate whether HARQ is enabled; The PSFCH configuration includes at least one of a period of the PSFCH, a time domain location of the PSFCH, a frequency domain location of the PSFCH, configuration information indicating whether to configure a PSFCH resource, and a minimum interval between data and a corresponding PSFCH for feeding back the data; The synchronization resource includes at least one of a period of a synchronization signal, a number of synchronization slots in the period of the synchronization signal, a number of repetitions of the synchronization signal, a synchronization slot offset amount, a time interval of the synchronization signal, and an SCS; The method of claim 1 , wherein the SCS comprises at least one of a synchronization signal SCS and a carrier SCS.

4. The first information is Synchronous reference order; Synchronous reference priority indication information; A first instruction; A HARQ configuration; and A PSFCH configuration; and SCS configuration, The included synchronization resource; A start symbol; and the number of occupied symbols; Here, the first instruction information is Whether at least one specific synchronization reference needs to be monitored, Whether at least one particular synchronous reference needs to be skipped, and whether to directly or indirectly synchronize to at least one particular synchronization reference; The synchronous reference order is: a priority or priority group order for synchronization references; The priority order of the services; A priority order of the synchronization resources; Signal strength order; and the order of the searched time, The HARQ configuration is used to indicate whether HARQ is enabled; The PSFCH configuration includes at least one of a period of the PSFCH, a time domain location of the PSFCH, a frequency domain location of the PSFCH, configuration information indicating whether to configure a PSFCH resource, and a minimum interval between data and a corresponding PSFCH for feeding back the data; The synchronization resource includes at least one of a period of a synchronization signal, a number of synchronization slots in the period of the synchronization signal, a number of repetitions of the synchronization signal, a synchronization slot offset amount, a time interval of the synchronization signal, and an SCS; The method of claim 1 , wherein the SCS comprises at least one of a synchronization signal SCS and a carrier SCS.

5. The plurality of first carriers include: A plurality of carriers used for CA transmission; A plurality of carriers used in multicarrier transmission; A plurality of carriers used for SL transmission; a first carrier set; A second carrier aggregation; and a third carrier set; The method of claim 1 , wherein the second carrier set includes carriers that may be used as synchronization carriers, and the third carrier set includes a set of available synchronization carriers.

6. The terminal determining a second carrier from a plurality of first carriers includes: The terminal determines a second carrier from a plurality of first carriers based on a first rule; Here, the first rule is: determining the second carrier based on a selection priority; determining a carrier whose signal quality satisfies a first condition as the second carrier; determining a carrier whose searched time satisfies a second condition as the second carrier; determining a carrier whose synchronization reference type priority satisfies a third condition as the second carrier; determining a carrier on which a HARQ configuration is enabled or not enabled as the second carrier; determining a carrier whose period of a PSFCH configuration satisfies a fourth condition as the second carrier; determining a carrier in which a resource pool satisfies a fifth condition as the second carrier; determining a carrier whose second priority satisfies a sixth condition as the second carrier; and determining a carrier whose synchronization resource satisfies a seventh condition as the second carrier; Here, the second priority is: A priority or priority group of the synchronization reference; Service priority and and a priority of the synchronization resource; The synchronization resource is: The period of the synchronization signal; the number of synchronization slots within the period of the synchronization signal; The number of repetitions of the synchronization signal; A synchronous slot offset amount; the time interval of the synchronization signal; and an SCS, the SCS including at least one of an S-SSB SCS and a carrier SCS.

7. Carriers that meet the first condition above are: The carrier with the strongest signal, The carrier with the weakest signal strength, and a carrier having a signal strength at a first threshold; and / or Carriers that meet the second condition above are: The carrier with the earliest search time, The carrier with the latest search time, and a carrier where the searched time is a predetermined time, and / or Carriers that meet the third condition above are: The carrier with the highest priority for the synchronization reference type; The carrier with the lowest synchronization reference type priority; and a carrier having a synchronization reference type priority of a predetermined synchronization reference priority; and / or Carriers that meet the fourth condition above are: The carrier with the largest period of the PSFCH configuration; the carrier with the smallest period of the PSFCH configuration; and a carrier in which the period of the PSFCH configuration is a first predetermined period; and / or Carriers that meet the fifth condition above are: a carrier including at least one resource pool having a PSFCH resource; A carrier including at least one resource pool that does not have a PSFCH resource; a carrier including a resource pool, neither of which has a PSFCH resource; and a carrier each including a resource pool having PSFCH resources; and / or A carrier that meets the sixth condition above is: The carrier with the highest priority, The carrier with the lowest priority, 7. The method of claim 6, wherein the priority includes at least one of: a carrier with a predetermined priority.

8. Carriers that meet the seventh condition above are: The carrier with the largest period of the synchronization signal, The carrier with the smallest period of the synchronization signal, a carrier having a synchronization signal with a second predetermined period; The carrier with the largest number of synchronous slots in a period, The carrier with the smallest number of synchronization slots in a period, A carrier having a predetermined number of synchronous slots in a period; The carrier with the highest number of repetitions of the synchronization signal, The carrier with the smallest number of repetitions of the synchronization signal; a carrier having a synchronization signal repetition number of a predetermined number; The carrier with the largest synchronous slot offset, The carrier with the smallest synchronous slot offset, A carrier having a synchronous slot offset of a predetermined offset amount; The carrier with the largest time interval between synchronization signals, A carrier having a synchronization signal with a predetermined time interval; The carrier with the largest SCS, The carrier with the smallest SCS, The method of claim 6 , wherein the SCS comprises at least one of: a carrier that is a given SCS;

9. The selection priority is: Selection priority relations; and a selection priority order, wherein the first selection priority relationship includes a mapping relationship between at least one selection priority and at least one carrier.

10. determining the second carrier based on a selection priority; determining a carrier having the highest selection priority as the second carrier; determining a carrier having a selection priority higher than a first predetermined selection priority as the second carrier; determining a carrier having a lowest selection priority as the second carrier; determining a carrier having a selection priority lower than a second predetermined selection priority as the second carrier; and determining as the second carrier a carrier having a third selection priority.

11. The selection priority is: The Protocol provides for: A network comprising: A pre-configured Instructed by the network; Synchronous reference priority indication information; A first instruction; Synchronous reference order; A synchronous reference type, A synchronization parameter configuration method; The second priority, A HARQ configuration; and A PSFCH configuration; and SCS configuration, Synchronization resources; A carrier frequency point; The method of claim 6 , wherein the determined based on at least one of: a carrier index;

12. The selection priority order is: Synchronous reference priority indication information; A first instruction; Synchronous reference order; A synchronous reference type, A synchronization parameter configuration method; The second priority, A HARQ configuration; and A PSFCH configuration; and SCS configuration, Synchronization resources; A carrier frequency point; The method of claim 9 , wherein the determined based on at least one of: a carrier index;

13. The first instruction information is Whether at least one specific synchronization reference needs to be monitored, Whether at least one particular synchronous reference needs to be skipped, and whether to directly or indirectly synchronize to at least one particular synchronization reference; and / or The synchronous reference order is: a priority or priority group order for synchronization references; The priority order of the services; A priority order of the synchronization resources; Signal strength order; and the order of the searched time, and / or The synchronization reference type includes at least one of a gNB, an eNB, a GNSS, a UE, and a UE internal clock; and / or The synchronization parameter configuration method includes at least one of network configuration and pre-configuration; and / or The second priority is: A priority or priority group of the synchronization reference; Service priority and and a priority of the synchronization resource; and / or The HARQ configuration is used to indicate whether HARQ is enabled; and / or The PSFCH configuration includes at least one of a period of the PSFCH, a time domain location of the PSFCH, a frequency domain location of the PSFCH, configuration information indicating whether to configure a PSFCH resource, and a minimum interval between data and a corresponding PSFCH for feeding back the data; and / or The synchronization resource is: The period of the synchronization signal; the number of synchronization slots within the period of the synchronization signal; The number of repetitions of the synchronization signal; A synchronous slot offset amount; the time interval of the synchronization signal; and an SCS, the SCS including at least one of an SCS of an S-SSB and an SCS of a carrier.

14. The selection priority order is: A carrier synchronization reference order; When the synchronization reference order of the carrier includes an overlapping portion, a first order corresponding to the overlapping portion; When the synchronization reference order of the carrier includes an overlapping portion, a synchronization reference order corresponding to a non-overlapping portion other than the overlapping portion; 10. The method of claim 9, wherein the carrier number is determined based on at least one of:

15. The selection priority order is: A selection priority corresponding to a carrier having a high synchronization reference priority is higher than a selection priority corresponding to a carrier having a low synchronization reference priority, or is lower than a selection priority corresponding to a carrier having a low synchronization reference priority; The synchronization reference priority order corresponding to the carrier includes an overlapping portion, and a selection priority corresponding to a carrier having a high synchronization reference priority in the overlapping portion is higher than a selection priority corresponding to a carrier having a low synchronization reference priority in the overlapping portion, or is lower than a selection priority corresponding to a carrier having a low synchronization reference priority in the overlapping portion; The method of claim 9, wherein the synchronization reference priority order corresponding to the carriers includes an overlapping portion, and the selection priority corresponding to a carrier having a high synchronization reference priority in a non-overlapping portion other than the overlapping portion is higher than the selection priority corresponding to a carrier having a low synchronization reference priority in the non-overlapping portion, or is lower than the selection priority corresponding to a carrier having a low synchronization reference priority in the non-overlapping portion.

16. The selection priority order is: a selection priority corresponding to a carrier of a first synchronization reference is higher or lower than a selection priority corresponding to a carrier of a second synchronization reference, the procedure of the first synchronization reference is higher than the procedure of the second synchronization reference, and / or the first synchronization reference is a predetermined synchronization reference; A selection priority corresponding to a carrier having a first HARQ configuration is higher or lower than a selection priority corresponding to a carrier having another HARQ configuration other than the first HARQ configuration, and the first HARQ configuration is a predetermined HARQ configuration; A selection priority corresponding to a carrier having a first PSFCH configuration is higher or lower than a selection priority corresponding to a carrier having a second PSFCH configuration; 10. The method of claim 9, wherein a selection priority corresponding to a carrier of a first SCS is determined based on at least one of: a selection priority corresponding to a carrier of a second SCS being higher or lower than a selection priority corresponding to a carrier of a first SCS; the first SCS being higher than the second SCS; and / or the first SCS being a predetermined SCS.

17. The first PSFCH configuration and the second PSFCH configuration a periodicity of the first PSFCH configuration is greater than a periodicity of the second PSFCH configuration; a periodicity of the first PSFCH configuration is smaller than a periodicity of the second PSFCH configuration; the first PSFCH configuration being a predetermined PSFCH configuration; 17. The method of claim 16, wherein at least one of the following is satisfied: a carrier having the first PSFCH configuration is a carrier having PSFCH resources, and a carrier having the second PSFCH configuration is a carrier having no PSFCH resources, or a carrier having the first PSFCH configuration is a carrier having no PSFCH resources and a carrier having the second PSFCH configuration is a carrier having PSFCH resources.

18. The selection priority order is: a selection priority corresponding to a carrier of a first synchronization signal is higher or lower than a selection priority corresponding to a carrier of a second synchronization signal, the period of the first synchronization signal is larger than the period of the second synchronization signal, and / or the period of the first synchronization signal is a third predetermined period; a selection priority corresponding to a carrier having a first number of synchronization slots per period is higher or lower than a selection priority corresponding to a carrier having a second number of synchronization slots per period, said first value being higher than said second value and / or said first value being a first predetermined value; a selection priority corresponding to a carrier having a third value of repetition of a synchronization signal is higher or lower than a selection priority corresponding to a carrier having a fourth value of repetition of a synchronization signal, the third value being higher than the fourth value, and / or the third value being a second predetermined value; A selection priority corresponding to a carrier with a first synchronization slot offset is higher or lower than a selection priority corresponding to a carrier with a second synchronization slot offset, the first synchronization slot offset is larger than the second synchronization slot offset, and / or the first synchronization slot offset is a predetermined synchronization slot offset; 10. The method of claim 9, wherein a selection priority corresponding to a carrier of a first time interval of a synchronization signal is determined based on at least one of: a selection priority corresponding to a carrier of a second time interval being higher or lower than a selection priority corresponding to a carrier of a first time interval of a synchronization signal, the first time interval being larger than the second time interval, and / or the first time interval being a predetermined time interval.

19. The first carrier set comprises: a carrier in a second carrier set; a carrier in the third carrier set; All carriers that can be used for carrier aggregation CA transmission; A carrier actually used for CA transmission; The carrier that was once selected for CA transmission, All carriers that can be used in multicarrier transmission; Carriers actually used in multicarrier transmission, The carriers that were once selected for multi-carrier transmission, All carriers that can be used for SL transmission; The carrier actually used for SL transmission, The carrier that was once selected for steam locomotive transmission, and a carrier including synchronization resources; The method of claim 5 , wherein the second carrier set includes carriers that may be used as synchronization carriers, and the third carrier set includes a set of available synchronization carriers.

20. The fourth carrier comprises: a carrier in a second carrier set; a carrier in the third carrier set; All carriers that can be used for carrier aggregation CA transmission; A carrier actually used for CA transmission; The carrier that was once selected for CA transmission, All carriers that can be used in multicarrier transmission; Carriers actually used in multicarrier transmission, The carriers that were once selected for multi-carrier transmission, All carriers that can be used for SL transmission; The carrier actually used for SL transmission, The carrier that was once selected for steam locomotive transmission, and a carrier including synchronization resources; The method of claim 1 , wherein the second carrier set includes carriers that may be used as synchronization carriers, and the third carrier set includes a set of available synchronization carriers.

21. A carrier determination device, comprising: A determining module for determining a second carrier and / or a plurality of third carriers from the plurality of first carriers based on first information of at least a portion of the plurality of first carriers; wherein the second carrier is used to determine second carrier synchronization information and / or fourth carrier synchronization information; the third carriers are used for transmitting a side link (SL); the plurality of first carriers satisfy a first condition; The plurality of third carriers satisfy a second condition.

22. A terminal including a processor and a memory, the memory storing a program or instructions operable on the processor, the program or instructions implementing the steps of the carrier determination method according to any one of claims 1 to 20 when executed by the processor.

23. A readable storage medium having a program or instructions stored therein, the program or instructions implementing the steps of the carrier determination method of any one of claims 1 to 20 when executed by a processor.

Images