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, device, terminal, and readable storage medium. [Background technology]

[0002] Currently, when carrier aggregation technology is applied to 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 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 is an issue that needs to be resolved quickly. Summary of the Invention [Problem to be solved by the invention]

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

[0005] A first aspect provides a carrier determination method, the method comprising: The method includes a terminal determining a second carrier and / or a plurality of third carriers from a plurality of first carriers based on 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 plurality of third carriers are used for sidelink (SL) transmission; the plurality of first carriers satisfy a first condition; The plurality of 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 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 plurality of third carriers are used for sidelink (SL) transmission; the plurality of first carriers satisfy a first condition; The plurality of 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 performing the steps of the method of the first aspect when executed by the processor.

[0008] A fourth aspect provides a terminal, the terminal including: a processor; and a communication interface, wherein the processor is configured to determine a second carrier and / or a plurality of third carriers from a plurality of first carriers based on 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 plurality of third carriers are used for sidelink (SL) transmission; the plurality of first carriers satisfy a first condition; The plurality of 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, wherein the terminal may be used to perform the 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, and 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. [Effects of the Invention]

[0013] In an embodiment of the present application, a 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 plurality of first 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 for sidelink SL transmission, the plurality of first carriers satisfying a first condition and the plurality of third carriers satisfying a second condition. In 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, thereby realizing timing synchronization when each carrier performs sidelink data transmission, thereby improving the reliability of the communication system. [Brief explanation 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. [Figure 2] 1 is a schematic diagram of a carrier determination method according to an embodiment of the present application; [Figure 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; [Figure 5] 1 is a hardware structure schematic diagram of a terminal according to an embodiment of the present application; DETAILED DESCRIPTION OF THE INVENTION

[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 fall within the scope of protection of the present application.

[0016] The terms "first," "second," etc. in the specification and claims of this application are intended to distinguish between similar objects and are not intended to describe a particular order or sequence. It should be understood that terms used in this manner are interchangeable where appropriate, so that embodiments of this application may be performed in orders other than those illustrated or described herein, and that objects distinguished by "first" and "second" are generally of the same type and do not limit the number of objects; for example, a first object may be one or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates 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 described techniques may be used in the above-mentioned systems and radio technologies as well as 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 following description, 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 embodiments 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-side 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-mounted equipment (PUE), a smart home (home equipment with wireless communication capabilities, such as a refrigerator, television, washing machine, or furniture), a game console, a personal computer (PC), a teller machine, or a self-service machine, and wearable devices include 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 garment, 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 access network equipment or core network equipment, where the access network equipment 12 may be called radio access network equipment, radio access network (RAN), radio access network function or radio access network unit.The access network equipment 12 may include a base station, a WLAN access point, a WiFi node, or the like. 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. It should be noted that the embodiments of this application only take the base station in an NR system as an example, and do not limit the specific type of base station.

[0019] The following provides an interpretation of nouns for some technical terms related to the embodiments of the present 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 must be provided. However, due to the lack of continuous spectrum with such a large bandwidth, LTE-A proposes the solution of carrier aggregation.

[0021] Carrier aggregation (CA) is the aggregation of two or more component carriers (CC) to support a larger transmission bandwidth (up to 100 MHz). In practice, each component carrier corresponds to one independent cell. Generally, 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 bandwidths 2) Adjacent or non-adjacent component carriers within the same frequency band 3) Component carriers in different frequency bands It should be mentioned 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, from its 12th release version onwards, supports sidelink (SL) transmission for direct data transmission between terminal user equipment (UE) without the need for network equipment. Note that sidelink can also 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, while the latter is controlled by the UE to autonomously select resources.

[0025] Starting with the 15th release, 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 carriers (PCC) and secondary component carriers (SCC). In autonomous resource selection mode, UEs perform resource sensing and reservation independently on each CC.

[0026] The LTE sidelink design is applicable to specific 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, and sensor extensions. Since the LTE sidelink only supports broadcast communications, it is primarily used for basic safety-related communications, while 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 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, and the like, where some network coverage areas and terminals are located in different cells. In sidelink communication, synchronization between terminals is required to ensure normal data transmission and reception, so synchronization between terminals needs to be ensured in various scenarios.

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

[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. In this case, 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 for sidelink communication, and the terminal selects the synchronization reference with the highest priority level to maintain global synchronization as much as possible in sidelink communication, thereby avoiding reduced transmission efficiency or reliability issues 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 as the highest priority, it is supported to disable the P3 / P4 / P5 levels by network configuration information or pre-configuration information, i.e., to include only the P0 / P1 / P2 / P6 levels. At this time, the synchronization information of all terminals (excluding terminals that obtain synchronization information based on their internal clocks) is obtained based on GNSS, ensuring that all terminals are synchronized. This is because when the gNB / eNB is configured as the highest priority, P3' / P4' / P5' cannot be disabled at this time, and all terminals outside the network coverage still need to obtain synchronization information based on GNSS.

[0034] Before performing sidelink communication, a terminal must first determine a synchronization reference and obtain synchronization information based on the synchronization reference. A terminal that meets the conditions transmits a bypass synchronization source SLSS and a bypass broadcast channel PSBCH on the sidelink to help other terminals perform synchronization. The terminal must determine an SLSS identifier ID corresponding to the SLSS transmitted by the terminal based on the synchronization reference, determine PSBCH content based on the synchronization reference, and determine a 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 carriers. The specific process is that the UE selects a synchronization carrier, takes the synchronization reference corresponding to the synchronization carrier as the synchronization reference for other aggregation carriers, and determines the timing of other carriers according to the timing corresponding to the synchronization carrier.

[0036] To realize synchronization carrier selection, a set Set A is defined, which includes carriers that can potentially be used as the synchronization carrier, and the UE selects Set B from Set A, which 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 a GNSS as a synchronization reference, i.e., the eNB or the GNSS is configured to have a higher priority. The following are several examples in which the terminal determines a synchronization carrier based on the synchronization reference type parameter:

[0038] For example, when the parameter typeTxSync is set to the eNB, the UE selects one CC from the intersection of Set A and CCs used for sidelink transmission as a synchronization carrier, For example, if 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, if 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. In this example, there are two cases:

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

[0040] For example, when the parameter typeTxSync is set in the eNB, a synchronization reference is selected for each CC in the intersection of SetA and CA, and the CC with the highest priority is selected as the synchronization carrier according to the following priorities:

[0041] P1: CC whose 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 is a UE whose synchronization reference is GNSS directly synchronized to the eNB. P5: CC is a UE whose synchronization reference is GNSS indirectly synchronized to the eNB P6: CC whose synchronization reference is the remaining UE For example, if 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, if 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 whose synchronization reference is a UE that directly synchronizes with the eNB P1: CC whose synchronization reference is a UE 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 of priority The following describes in detail the carrier determination method according to the embodiments of the present application through several examples and application scenarios thereof in conjunction with the drawings.

[0043] In related technology, when carrier aggregation technology is applied to NR sidelink, timing misalignment between different carriers can lead to a series of problems, such as half-duplex transmission and reception and transmission power attenuation, which can affect the transmission efficiency of the NR sidelink system. Therefore, timing synchronization should be performed using the same synchronization reference between different carriers. Specifically, a 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 enabling timing synchronization of all carrier aggregations.

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

[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 plurality of third carriers from the plurality of first carriers based on first information of at least some carriers among the plurality of 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 the fourth carrier.

[0048] In an embodiment of the present application, the plurality of 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 satisfy the second condition.

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

[0052] Optionally, in the 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 and time-frequency information.

[0054] It should be noted that a synchronization reference is a device that can provide synchronization information. 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 achieved.

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

[0056] In the 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 that some configurations between carriers are the same or different.

[0059] In an embodiment of the present application, when the terminal determines that a carrier will perform SL transmission, SL multi-carrier operation, or SL CA operation, it must 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 must ensure 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 ensuring that the configuration of the first carrier meets the first condition, the network side device directly sets the first carrier as the second carrier, and can use the first carrier 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: The synchronization reference orders of at least some of the carriers are the same, or the synchronization reference orders of at least some of the carriers are different; 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 indication information of at least some of the carriers is the same, or the first indication 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 an embodiment of the present application, the second condition is: The synchronization reference order of at least some of the carriers is the same; The synchronization reference priority indication information of at least some of the carriers is the same; 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; 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] Illustratively, the synchronization reference order of at least some carriers being the same includes at least some carriers having the same synchronization reference order, or at least some carriers having a specific synchronization reference order.

[0065] Illustratively, the synchronization reference orders of at least some of the carriers being different 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 at least some of the carriers having the same synchronization reference priority indication information, or at least some of the carriers having specific synchronization reference priority indication information.

[0067] Illustratively, 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 of the carriers have specific first instruction information.

[0068] Illustratively, 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] Illustratively, 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] Illustratively, 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] Illustratively, the SCS configurations of at least some carriers being the same include at least some carriers having the same SCS configuration, or at least some carriers having a specific SCS configuration.

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

[0073] Illustratively, the PSFCH configurations of at least some carriers being different include at least some carriers having 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 the second carrier set; a carrier in the third career set; All carriers that can be used for carrier aggregation CA transmission; The carrier actually used for CA transmission, The carriers that were once selected for CA transmission, All carriers that can be used in multicarrier transmission; The 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 that were 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 some of the items, or may be a carrier of at least some of the items, or may be a product of the items, or may be a subset of a product of the items.

[0078] Exemplarily, the third carrier is a portion of the carriers in the second carrier set, or a portion of the carriers in the third carrier set, or a portion of the carriers in the second carrier set and a portion 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 description takes the second carrier aggregation and the third carrier aggregation as examples.

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

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

[0082] In one possible example, the terminal obtains synchronization information for the third carrier based on synchronization information for the second carrier. Illustratively, the terminal obtains 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 and PSFCH configuration and SCS configuration and the synchronization resource it contains; A start symbol, and the number of occupied symbols.

[0084] Illustratively, the first instruction information is: Whether at least one specific synchronization reference needs to be monitored, and Whether at least one particular synchronization reference needs to be skipped, and 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] Illustratively, 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 for which the carrier is configured or a synchronization resource for which the carrier is pre-configured.

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

[0092] For example, the number of occupied symbols may be the number of occupied symbols of the sidelink.

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

[0094] In one possible example, the plurality of third carriers satisfying the second condition is: The synchronization reference order of at least some of the plurality of third carriers is the same; The synchronization reference priority indication information of at least some of the plurality of third carriers is the same; 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; and The SCS configurations of at least some of the third carriers are the same; and The 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 the number of occupied symbols of at least some of the plurality of third carriers is the same.

[0095] In one possible example, the plurality of first carriers satisfying a first condition is: The synchronization reference orders of at least some of the multiple first carriers are the same, or the synchronization reference orders of at least some of the multiple first carriers are different; 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 multiple first carriers are the same, or the HARQ configurations of at least some of the multiple 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; The SCS configurations of at least some of the multiple first carriers are the same, or the SCS configurations of at least some of the multiple first carriers are different; 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 plurality of first carriers are the same, or the starting symbols of at least some of the plurality of first carriers are different; The number of occupied symbols of at least some of the multiple first carriers may be the same, or the number of occupied symbols of at least some of the multiple first carriers may be 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 a third carrier set (e.g., setB).

[0097] Illustratively, the first carrier set herein is: a carrier in the second carrier set; a carrier in the third career set; All carriers that can be used for carrier aggregation CA transmission; The carrier actually used for CA transmission, The carriers that were once selected for CA transmission, All carriers that can be used in multicarrier transmission; The 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 that were once selected for SL transmission, and a carrier including synchronization resources.

[0098] For example, the carriers in the first carrier set may be all or part of any one of the carriers, or may be all or 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 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 then be any one of the plurality of carrier sets, or any of the plurality of carrier sets, or a subset of any one of the carrier sets, or a subset of any of the plurality of carrier sets, or a cross-set of any of the plurality of carrier sets, or a subset of a cross-set of any of the plurality of 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, Furthermore, 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, "the terminal determines a second carrier from a plurality of first carriers" in the above step 201 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 a selection priority; Signal quality is the eight Deciding on a career that satisfies the above conditions as a second career; The searched time is Nine Deciding on a career that satisfies the above conditions as a second career; 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; determining a carrier whose second priority satisfies the sixth condition as a second carrier; and determining a carrier whose synchronization resource satisfies a seventh condition as the second carrier.

[0105] Illustratively, the second priority is: a priority or priority group of synchronization references; Service priority and and the priority of the synchronization resource.

[0106] Illustratively, 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 synchronization slot offset amount; the time interval of the synchronization signal; and at least one of 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 The searched time point includes at least one of a carrier where the searched time point is a predetermined time point.

[0109] In some possible embodiments, the carrier that satisfies the third condition is: The carrier with the highest synchronization reference type priority; 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 in 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 PSFCH resources; a carrier including at least one resource pool that does not have a PSFCH resource; a carrier including a resource pool that does not have any PSFCH resources; and a carrier that includes a resource pool with 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 synchronization slots in a period, The carrier with the smallest number of synchronization slots in a period, A carrier having a predetermined number of synchronization slots within 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 in which the number of repetitions of a synchronization signal is a predetermined number; The carrier with the largest synchronous slot offset, The carrier with the smallest synchronous slot offset, a carrier whose synchronization slot offset amount is 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 and The SCS includes at least one of a carrier that is a predetermined 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, i.e., 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] Illustratively, 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] For example, the selection priority order may be determined by a protocol.

[0120] It should be clarified 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 plurality of first carriers based on the selection priority order, and determining at least one carrier with 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 the carrier with the highest selection priority as the second carrier; determining a carrier having a selection priority higher than the first predetermined selection priority as a second carrier; determining the carrier with the lowest selection priority as the second carrier; determining a carrier having a selection priority lower than a second predetermined selection priority as a second carrier; and determining a carrier having a selection priority of third as the second carrier.

[0123] Illustratively, the method by which the terminal determines the second carrier (i.e., the method by which the terminal selects 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 the first threshold as a second carrier; a3) determining a carrier having the lowest selection priority or lower than the first threshold as the 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 aggregation carrier / multiple carriers / at least two carriers / Set A / Set B / first carrier set; 2) Synchronization reference order of at least some carriers in the aggregation carrier / multiple carrier / at least two carriers / Set A / Set B / first carrier set; 3) HARQ configuration of at least some carriers in the aggregation carrier / multiple carrier / at least two carriers / Set A / Set B / first carrier set; 4) PSFCH configuration of at least some carriers in the aggregation carrier / multiple carrier / at least two carriers / Set A / Set B / first carrier set; 5) SCS configuration of at least some carriers in the aggregation carrier / multiple carrier / at least two carriers / Set A / Set B / first carrier set; 6) Obtained based on at least one of aggregation carriers / 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 specific 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 RSRP strength as a second carrier; a11) Determine the carrier with the earliest searched 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 point is a specific value as a second carrier; a14) determining a carrier having a synchronization reference of a specific type as a second carrier; For example, the above a5) to a14) are: 1) Synchronization reference order of at least some carriers in aggregation carrier / multiple carrier / at least two carriers / Set A / Set B / first carrier set; 2) Synchronization reference order of at least some carriers in the aggregation carrier / multiple carrier / at least two carriers / Set A / Set B / first carrier set; 3) Obtained based on at least one of aggregation carrier / multiple carrier / at least two carriers / Set A / Set B / synchronization reference priority indication information of at least some carriers in at least some carriers in the first carrier set / first information.

[0125] a15) determining a carrier on which HARQ configuration is enabled as a second carrier; a16) determining a carrier on which the HARQ configuration is not enabled as a second carrier; a17) determining the carrier with the largest period of the PSFCH configuration as the second carrier; a18) determining the carrier with the smallest period of the PSFCH configuration as the 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 PSFCH resources 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 exists 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 the HARQ / PSFCH / SCS configurations of aggregation carriers / multiple carriers / at least two carriers / Set A / Set B / at least some carriers in the first carrier set.

[0126] a27) determining the carrier with the largest synchronization signal period as the second carrier; a28) determining the carrier with the smallest synchronization signal period 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 synchronization slot offset as the second carrier; a37) determining the carrier with the smallest synchronization slot offset as the second carrier; a38) determining a carrier having a specific synchronization slot offset amount 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 aggregation carrier / multiple carriers / at least two carriers / Set A / Set B / first carrier set.

[0127] In some possible embodiments, the selection priority is: The contracts stipulated by the Protocol, A network consisting of: 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 and PSFCH configuration and 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 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 and PSFCH configuration and 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] Illustratively, the first instruction information is: Whether at least one specific synchronization reference needs to be monitored, and Whether at least one particular synchronization reference needs to be skipped, and It is used to indicate at least one of whether to synchronize directly or indirectly to at least one particular synchronization reference.

[0132] Illustratively, the top sync reference order is: an order of priorities or priority groups corresponding to synchronization references; The priority order of the services; A priority order of synchronization resources; Signal strength ordering (e.g., Reference Signal Received Strength (RSRP) strength ordering), The order of the searched time is included in at least one of the following:

[0133] Illustratively, the synchronization reference type includes at least one of a gNB, an eNB, a GNSS, a UE, and a UE internal clock.

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

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

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

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

[0138] Illustratively, 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.

[0139] Illustratively, 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 synchronization slot offset amount; the time interval of the synchronization signal; and at least one of SCS, Here, the SCS includes at least one of an S-SSB SCS and a carrier SCS.

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

[0141] Example 1: Determining carriers 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 directly synchronizes with a gNB / eNB as a carrier under selection priority; Determining a carrier whose synchronization reference is a UE that indirectly synchronizes with 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 GNSS as a carrier under selection priority; and determining the carrier whose synchronization reference is the remaining UE as the carrier with the lower selection priority.

[0142] Example 2: Determining carriers included in the selection priority based on the synchronization reference type, or determining a 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 (synchronization reference UE), and whose SLSS ID of SyncRef UE belongs to a set / partial set of SLSS IDs defined in the coverage, and whose coverage indication parameter indicates true, as a carrier under the selection priority; Determine a carrier whose synchronization reference is SyncRef UE, and whose SLSS ID of SyncRef UE belongs to a set / partial set of SLSS IDs defined in the coverage, and whose coverage indication parameter indicates false, as a carrier under the selection priority; Determine a carrier where 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 / where 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 selection priority; Determine a carrier whose 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 as a carrier under selection priority; Determine 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 with a lower selection priority.

[0143] Example 3: The first selection priority above is 1) Synchronization reference priority indication information for at least some of the carriers among the plurality of carriers; 2) first instruction information of at least some of the carriers; 3) a synchronization reference order of at least some of the carriers among the plurality of carriers; 4) HARQ configurations of at least some of the carriers; 5) PSFCH configurations of at least some of the carriers; 6) SCS configurations of at least some of the carriers; and 7) PSFCH configurations of at least some carriers among a plurality of carriers; 8) SCS configurations of at least some of the carriers; 9) Synchronization resources included (e.g., configured or pre-configured) in at least some of the carriers; and 10) Synchronization reference priority types of at least some of the carriers; 11) A synchronization reference type for at least some of the carriers; and 12) a second preference for 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 multiple carriers of an aggregation carrier, a multi-carrier, at least some 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 (or some) parameter may be determined as a carrier with a lower selection priority.

[0147] For example, when the selection priority is determined based on the carrier frequency point, a carrier having a certain (several) value of the carrier frequency point is determined as a carrier having 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] For example, when determining the selection priority based on the synchronization resource, a carrier having a certain (several) value of synchronization resource is determined as a carrier having a lower selection priority. For example, a carrier having a certain (several) value of the period of the synchronization signal, a certain (several) value of the number of synchronization slots in the period, and / or a carrier having a certain (several) value of the repetition number of S-SSB, and / or a certain (several) value of the synchronization slot offset amount, and / or a certain (several) value of the time interval of S-SSB, and / or a certain (several) value of the SCS of S-SSB are determined as a carrier having a lower selection priority.

[0150] Furthermore, the selection priority may be determined based on synchronization resources of at least some of the carriers among a plurality of carriers (including at least one of a plurality of carriers of an aggregation carrier, a multi-carrier, at least some of the carriers among 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] Illustratively, when the selection priority includes carriers whose synchronization references are of several synchronization reference types, 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 that is directly synchronized to 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] Illustratively, 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, 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 in which the synchronization reference is a first synchronization reference type, and the SLSS ID of the first synchronization reference type belongs to a first SLSS ID set, and the coverage indication parameter indicates 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 be a first synchronization reference type, and the SLSS ID of the first synchronization reference type may be a second SLSS ID, and the coverage indication parameter may include at least one of 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 portion of an SLSS ID set defined within a carrier's 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, indicating true or indicating false.

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

[0155] Illustratively, taking the synchronization reference type as an example, the at least one carrier: 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 belongs to a set / partial set of SLSS IDs defined in the 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 the SLSS ID set / partial set defined in the coverage, and whose coverage indication parameter indicates false; 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 it 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 whose synchronization reference is SyncRef UE, and whose SLSS ID is 0, and whose SLSS is not transmitted on a third set of synchronization resources, and whose coverage indication parameter is indicated as false; The synchronization reference may be 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] For example, 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] For example, when determining at least one carrier based on a carrier frequency point, the at least one carrier may be a carrier whose carrier frequency point has a certain (several) value.

[0158] For example, when determining 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] For example, 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 synchronization signal period is a certain (several) value, a carrier whose synchronization slot number in a period is a certain (several) value, a carrier whose S-SSB repetition number is a certain (several) value, a carrier whose synchronization slot offset amount is a certain (several) value, a carrier whose S-SSB time interval is a certain (several) value, or a carrier whose S-SSB SCS is a certain (several) value.

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

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

[0162] Exemplarily, the 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 with a high synchronization reference procedure is higher than a selection priority corresponding to a carrier with a low synchronization reference procedure, or is lower than a selection priority corresponding to a carrier with a low synchronization reference procedure; The synchronization reference order of the carriers includes an overlapping portion, and the selection priority corresponding to the carrier with a high synchronization reference procedure in the overlapping portion is higher than the selection priority corresponding to the carrier with a low synchronization reference procedure in the overlapping portion, or is lower than the selection priority corresponding to the carrier with 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 with 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 with a low synchronization reference procedure in the non-overlapping portion, or the selection priority corresponding to a carrier with a low synchronization reference procedure in the non-overlapping portion is lower than the selection priority corresponding to a carrier with 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 consisting of: Instructed by the network, The determination is based on at least one of the preconfigured.

[0165] Here, the first instruction information is Whether at least one specific synchronization reference needs to be monitored, and Whether at least one particular synchronization reference needs to be skipped, and 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 multiple selection priorities in an arbitrary / specific order.

[0169] The process of determining the selection priority will be explained below using several examples.

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

[0171] For example, 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 high synchronization reference procedure is higher or lower than the selection priority corresponding to a carrier with a low synchronization reference procedure.

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

[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 examples, 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) for 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 descending 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 descending order, synchronization reference priority b1, synchronization reference priority b2, and synchronization reference priority b3.

[0179] It should be noted that this overlapping part of the synchronization reference priorities between Carrier 1 and Carrier 2 includes three synchronization reference priorities: those for UEs that are directly synchronized to GNSS, those for UEs that are indirectly synchronized to GNSS, and those for 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 or 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 the carrier with a higher synchronization reference sequence in the non-overlapping portion is higher or lower than the selection priority corresponding to the carrier with a lower synchronization reference sequence.

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

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

[0185] Correspondingly, by 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 both non-overlapping parts include gNB / eNB, UEs that are directly synchronized with the gNB / eNB, and UEs that are indirectly synchronized with the gNB / eNB.

[0186] Example 7: The non-overlapping portions of the synchronization reference order may be protocol predefined, network configured, network directed, or preconfigured.

[0187] b4) Selection priorities may be reordered by specific synchronization reference procedures.

[0188] b5) The selection priority corresponding to a carrier whose synchronization reference procedure is a specific 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 carriers that do not conflict with the configuration, where b2 corresponds to a method for determining the selection priority of carriers whose corresponding synchronization reference priorities are within the overlapping portion of existing carriers, and b3 corresponds to a method for determining the selection priority of carriers whose corresponding synchronization reference priorities are outside the overlapping portion of all carriers.

[0190] In a second possible example, In the scenario where the indication information (for example, 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] For example, 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 synchronizes directly with gNB / eNB Synchronization reference priority c5: UE indirectly synchronized to gNB / eNB Synchronous reference priority c6: remaining UE Accordingly, the selection priority order may include order 1, and order 1 (selection priorities a1 to a6) is as follows:

[0194] Selection priority a1: Carrier whose synchronization reference is a UE that directly synchronizes with GNSS Selection priority a2: Carrier whose 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 whose synchronization reference is a UE that directly synchronizes with a gNB / eNB Selection priority a5: A carrier whose 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 the high or low synchronization reference priority, 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 false. Synchronization reference priority cc3: UE's SLSS ID is 337 and the coverage indication parameter indicates false Synchronous reference priority cc4:gNB / eNB Synchronization reference priority cc5: The SLSS ID of the UE belongs to the SLSS ID set / partial set defined in the coverage, and the coverage indication parameter indicates that it is true. Synchronization reference priority cc6: The SLSS ID of the UE belongs to the SLSS ID set / partial 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 carrier on which the SLSS is transmitted on the third set of synchronization resources. Selection priority aa2: A carrier whose synchronization reference is SyncRef UE, whose SLSS ID is 0, whose SLSS is not transmitted on the third set of synchronization resources, and whose coverage indication parameter is indicated as false. Selection priority aa3: A carrier whose synchronization reference is SyncRef UE, whose SLSS ID is 337, and whose coverage indication parameter is instructed to be 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 descending order, 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 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 priorities cc1 to cc7 are used to distinguish between different synchronization reference priorities, and the numbers "1" to "7" in the synchronization reference priorities cc1 to cc7 may be used to distinguish between 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 priorities aa1 to aa7.

[0202] In a third possible example, In the scenario where the indication information (for example, 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 the carrier with a higher synchronization reference priority in the overlap is higher or lower than the selection priority corresponding to the carrier with a lower synchronization reference priority.

[0206] Example 10: (Definition of Overlapping Portion) When determining the selection priority order based on the priority order of the synchronization reference priority of the overlapping portion, 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 (for example, 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 directly synchronized to gNB / eNB Synchronization reference priority d5: UE indirectly synchronized to gNB / eNB Synchronous 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 Synchronous reference priority e3: remaining UE It should be noted that the synchronization reference priorities of carrier 7 are, in descending order, 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 descending order, 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 priorities d1 to d6 are used to distinguish between different synchronization reference priorities, and the numbers "1" to "6" in the synchronization reference priorities d1 to d6 may be used to characterize the synchronization reference priorities, i.e., the smaller the number, the higher the synchronization reference selection priority it represents. 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: Carrier whose synchronization reference is a UE that directly synchronizes with GNSS Selection priority b2: 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 synchronization priority It should be noted that in 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 determined synchronization reference of carrier 9 is 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 false Synchronous reference priority dd4:gNB / eNB Synchronization reference priority dd5: The SLSS ID of the UE belongs to the SLSS ID set / partial 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 / partial set defined in the coverage, and the coverage indication parameter indicates that it is false. Synchronous reference priority dd7: remaining UE As described above, the priority of any item of the selection priority may be the same, and for example, the priorities (priority order) of dd2 and dd3 may be the same.

[0215] The sl-NbAsSync of carrier 10 is false, and the synchronization reference priority order (synchronization reference priority ee1 to synchronization reference priority ee4) of the synchronization reference of 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 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 descending order, 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 descending order, 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 or 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 this is true / The synchronization reference is SyncRef UE, and the SLSS ID of SyncRef UE is 0, and the SLSS is Selection priority bb2: A carrier whose synchronization reference is SyncRef UE, whose SLSS ID is 0, whose SLSS is not transmitted on the third set of synchronization resources, and whose coverage indication parameter is indicated as false. Selection priority bb3: A carrier whose synchronization reference is SyncRef UE, whose SLSS ID is 337, and whose coverage indication parameter is false. Selection priority bb4: Carrier whose synchronization reference is another SyncRef UE As described above, the priority of any item of the selection priority may be the same, and for example, the priority (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 either predefined by the protocol, or configured by the network, or dictated by the network, or preconfigured.

[0222] c3) When there is an overlapping portion in the synchronization reference priority order, the selection priority corresponding to the carrier with a higher synchronization reference priority in the non-overlapping portion is higher or lower than the selection priority corresponding to the 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 (i.e., other than the overlapping parts), the selection priority order will be interpreted and explained using the following example.

[0224] For example, if the indication information of at least two carriers (for example, 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, if 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: Carrier whose synchronization reference is a UE that directly synchronizes with a gNB / eNB Selection priority d3: Carrier whose 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 "d1" to "d3" in the above selection priority d1 to selection priority d3 are used to distinguish different selection priorities, and the numbers "1" to "3" in the above selection priority d1 to selection priority d3 may be used to characterize high and low selection priorities, that is, the smaller the number, the higher the selection priority represented; Example 14: In combination with Example 2 above, if 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 and one for which the UE's SLSS ID belongs to the SLSS ID set / partial 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 the SLSS ID set / partial 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 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 item of the selection priority may be the same, and 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 "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, that is, the smaller the number, the higher the selection priority represented; It should be noted 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 specific procedure is higher or lower than the selection priority corresponding to a carrier whose synchronization reference procedure is another procedure.

[0231] It should be noted 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 are not intended to limit the selection priority orders; the above selection priority orders may be determined to be other orders according to actual circumstances, and the embodiments of the present application do not impose 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, so that the synchronization reference obtained based on this synchronization carrier will 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; Illustratively, 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 greater than a periodicity of the second PSFCH configuration; The period of the first PSFCH configuration is smaller than the period of the second PSFCH configuration; and 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 with PSFCH resources, and the carrier having the second PSFCH configuration is a carrier without PSFCH resources, or the carrier having the first PSFCH configuration is a carrier without PSFCH resources, and the carrier having the second PSFCH configuration is a carrier with PSFCH resources.

[0237] d4) the selection priority corresponding to the carrier of the first SCS is higher or lower than the 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 (for example, a specific period).

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

[0241] e3: the selection priority corresponding to the carrier whose synchronization signal repetition number is a third value is higher or lower than the selection priority corresponding to the carrier whose synchronization signal repetition number is a fourth value; Illustratively, the third value is greater than the fourth value, and / or the third value is a second predetermined value (eg, a specific 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 synchronization slot offset amount is greater than the second synchronization slot offset amount, and / or the first synchronization slot offset amount is a predetermined synchronization slot offset amount (e.g., a specific synchronization slot offset amount).

[0243] e5: the selection priority corresponding to the carrier in the first time interval is higher or lower than the selection priority corresponding to the carrier in the 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 specific time interval).

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

[0245] In the first possible example, 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 the carrier with a higher synchronization reference procedure is higher or lower than the selection priority corresponding to the carrier with a lower synchronization reference procedure (in other words, the selection priority must satisfy this rule).

[0246] For example, the selection priority corresponding to the carrier with the higher second priority may be higher or lower than the selection priority corresponding to the carrier with the 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, the selection priority corresponding to a carrier before the searched time may be higher or lower than the 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 with a specific HARQ configuration is higher or lower than the selection priority corresponding to a carrier with 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) The selection priority corresponding to a carrier having a particular PSFCH configuration is higher or lower than the selection priority corresponding to a carrier having another PSFCH configuration; 2) The selection priority corresponding to a carrier with a large period of the PSFCH configuration is higher or lower than the selection priority corresponding to a carrier with a small period of the PSFCH configuration; 3) The selection priority corresponding to a carrier with PSFCH resources is higher or lower than the selection priority corresponding to a carrier without PSFCH resources; Furthermore, the selection priority corresponding to the carrier including at least one resource pool having PSFCH resources is higher or lower than the selection priority corresponding to the carrier including a resource pool without PSFCH resources; 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 priorities corresponding to carriers that include at least one resource pool that does not have PSFCH resources are all higher / lower than the selection priorities corresponding to carriers that include a resource pool that has PSFCH resources.

[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 with a particular SCS may be higher or lower than the selection priority corresponding to a carrier with 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 a carrier having a synchronization signal with a large period is higher or lower than the selection priority corresponding to a carrier having a synchronization signal with a small period; The selection priority corresponding to a carrier having a specific synchronization signal period is higher or lower than the selection priority corresponding to a carrier having another synchronization signal period; The selection priority corresponding to a carrier with a larger number of synchronization slots in a period is higher or lower than the selection priority corresponding to a carrier with a smaller number of synchronization slots in a period; The selection priority corresponding to a carrier having a certain number of synchronization slots in a particular period is higher or lower than the selection priority corresponding to a carrier having a certain number of synchronization slots in another period; The selection priority corresponding to a carrier with a large number of repetitions of the synchronization signal is higher or lower than the selection priority corresponding to a carrier with a small number of repetitions of the synchronization signal, The selection priority corresponding to a carrier having a specific synchronization signal repetition number is higher or lower than the selection priority corresponding to a carrier having another synchronization signal repetition number; The priority (group) of a carrier with a large synchronization slot offset is higher or lower than that of a carrier with a small synchronization 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 with a large time interval of the synchronization signal is higher or lower than the selection priority corresponding to the carrier with a small 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] Illustratively, 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 set; and a third carrier set; 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.

[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 carriers in Set A; at least some carriers in Set B; and at least some carriers in a first carrier set.

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

[0259] For example, the plurality of carriers may be some carriers in the second carrier set, or some carriers in the third carrier set, or some carriers in the second carrier set and some 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 for each carrier in the first carrier set respectively if a predetermined condition is met.

[0262] The above-mentioned predetermined conditions are: the first carrier set is an empty set; and there is a synchronization reference determined by 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 described through 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), and g), or a subset of any one of them, or may be a product of any N items thereof, or a subset of a 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) Carrier 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 that are included in Set A (corresponding to the intersection) / at least one carrier actually used for CA transmission that is 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 the carriers configured / pre-configured by the network, and the UE selects a carrier from the carriers 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 one 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. The UE selects a synchronization carrier from this carrier set, and the synchronization reference corresponding to the synchronization carrier is 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. In this way, based on Rule 1 (i.e., a carrier with a higher synchronization reference priority has a higher selection priority), the terminal may ultimately select a carrier with a higher synchronization reference priority as the synchronization carrier, that is, the terminal selects CC1 as the synchronization carrier.

[0270] Example 3: A carrier set {CC1, CC2, CC3} is configured or pre-configured by the network, and a terminal selects a synchronization carrier from this carrier set, and the synchronization reference priority order of this carrier set is 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 orders of multiple carriers, the selection priority corresponding to the carrier with a higher synchronization reference priority in the overlapping part is higher), the terminal selects the carrier with a higher synchronization reference priority in 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, that is, the terminal selects CC3 as the synchronization carrier.

[0275] Example 5: A carrier set {CC1, CC2, CC3} is configured or pre-configured by the network, 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 30 KHz, the SCS of the CC2 configuration is 60 KHz, and the SCS of the CC3 configuration is 120 KHz.

[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 can be used for carrier aggregation and a network-configured or pre-configured carrier set Set A that can 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: Alternatively, if the synchronization reference type parameter is a base station, the synchronization carrier selection flow is as follows:

[0280] For example, 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. One carrier is selected as a synchronization carrier from one or more carriers included in Set A.

[0281] Illustratively, the carrier selected by the UE for CA transmission is: The carrier is in a pre-configured 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 met: 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 synchronizes directly with the eNB P2: A carrier whose synchronization reference is a UE that indirectly synchronizes to an eNB P3: Carrier whose synchronization reference is GNSS P4: Carrier whose synchronization reference is UE directly synchronized to GNSS P5: Carrier whose 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 P1, P2, P3, P4, P5, and P6 in descending order.

[0283] It should be noted that if there are multiple carriers that meet the conditions, the UE will autonomously select 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] Illustratively, 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 met: 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] Illustratively, 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 met: the synchronization reference type parameter (sl-SyncPriority) is configured / pre-configured by the network as GNSS, and GNSS is unreliable; The synchronization reference of one or more carriers included in Set A is determined, and they are sorted according to the following selection priorities (P1 to P6), and one of them with the highest priority is selected as the synchronization carrier.

[0287] P1: Carrier where the synchronization reference is the UE directly synchronized to GNSS P2: Carrier whose synchronization reference is a UE that indirectly synchronizes to GNSS P3: CC with synchronization reference gNB / eNB P4: Carrier whose synchronization reference is the UE directly synchronized to the gNB / eNB P5: 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 meet the conditions, the UE will autonomously select one of them.

[0288] As can be seen, the selection priority order is P1, P2, P3, P4, P5, and P6 in descending order.

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

[0290] Illustratively, 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, if the first carrier set is an empty set, the UE determines a synchronization reference for each carrier selected for CA transmission.

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

[0293] Optionally, if the synchronization reference type parameter is GNSS, Illustratively, 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 met: the synchronization reference priority order (sl-NbAsSync) of the CA carrier pre-configured / configured by the network / selected by the UE / SL transmission carrier / multiple carriers / at least two carriers / Set A / Set B / at least some carriers in the first carrier set is different; From the carriers included in SetA, one carrier with reliable GNSS is selected as the synchronization carrier.

[0294] Illustratively, 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 unreliable; If at least one of the following conditions is met: the synchronization reference priority order (sl-NbAsSync) of the CA carrier pre-configured / configured by the network / selected by the UE / SL transmission carrier / multiple carriers / at least two carriers / Set A / Set B / at least some carriers in the first carrier set is different; The synchronization reference of one or more carriers included in Set A is determined, and one carrier with the highest selection priority is selected as the synchronization carrier according to the following selection priorities ((P1 to P6)).

[0295] P1: Carrier where the synchronization reference is the UE directly synchronized to GNSS P2: Carrier whose synchronization reference is a UE that indirectly synchronizes to GNSS P3: Carrier whose synchronization reference is gNB / eNB P4: Carrier whose synchronization reference is the UE directly synchronized to the gNB / eNB P5: 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 P1, P2, P3, P4, P5, and P6 in descending order.

[0296] The flow of determining a synchronization carrier based on synchronization reference priority will be described below using an example 1.

[0297] Example S1: Illustratively, 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 unreliable; If at least one of the following conditions is met: the synchronization reference priority order (sl-NbAsSync) of the CA carrier pre-configured / configured by the network / selected by the UE / SL transmission carrier / multiple carriers / at least two carriers / Set A / Set B / at least some carriers in the 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 the carrier with the highest selection priority is selected as the synchronization carrier.

[0298] P1: Carrier where the synchronization reference is the UE directly synchronized to GNSS P2: Carrier whose synchronization reference is a UE that indirectly synchronizes to GNSS P3: Carrier whose synchronization reference is gNB / eNB P4: Carrier whose synchronization reference is the UE directly synchronized to the gNB / eNB P5: 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] If 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 carriers are P6, the UE selects the carriers whose corresponding selection priorities are P6 as 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] Illustratively, the above selection priority order is obtained based on the synchronization reference priority, for example, a carrier with a higher synchronization reference priority has a higher selection priority.

[0303] The flow of determining the synchronization carrier based on the synchronization reference priority order will be described below by way of an example.

[0304] Example S2: Illustratively, 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 unreliable; If at least one of the following conditions is met: the synchronization reference priority order (sl-NbAsSync) of the CA carrier pre-configured / configured by the network / selected by the UE / SL transmission carrier / multiple carriers / at least two carriers / Set A / Set B / at least some carriers in the 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 the carrier with the highest selection priority is selected as the synchronization carrier.

[0305] P1: Carrier where the synchronization reference is the UE directly synchronized to GNSS P2: Carrier whose synchronization reference is a UE that indirectly synchronizes to GNSS P3: Carrier whose synchronization reference is gNB / eNB P4: Carrier whose synchronization reference is the UE directly synchronized to the gNB / eNB P5: 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] For example, 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 the carrier with a higher synchronization reference priority in the overlapping part is higher, if the priority corresponding to at least one carrier is P1, P2, or P6, the UE selects the carrier with the higher selection priority from those corresponding to selection priorities P1, P2, or P6 as the synchronization carrier.

[0307] For example, the conditions for determining the selection priority include: when there is an overlapping portion in the synchronization reference priority order and the selection priority corresponding to the carrier with a higher synchronization reference priority in the non-overlapping portion is high, if there is no carrier with a corresponding selection priority of P1, P2, or P6, i.e., the selection priorities corresponding to all carriers are P3, P4, or P5, the UE selects a carrier with a higher selection priority from those with a corresponding selection priority of P3, P4, or 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 unreliable; If at least one of the following conditions is met: the synchronization reference priority order (sl-NbAsSync) of the CA carrier pre-configured / configured by the network / selected by the UE / SL transmission carrier / multiple carriers / at least two carriers / Set A / Set B / at least some carriers in the first carrier set is different; The UE determines the synchronization references of one or more carriers included in Set A, and 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 references obtained based on the synchronization reference priority order configured by the carriers, the UE determines a synchronization reference for each carrier individually.

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

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

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

[0312] For example, 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. One carrier is selected as a synchronization carrier from one or more carriers included in Set A.

[0313] Illustratively, the carrier selected by the UE for CA transmission is: The carrier is in a pre-configured 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 a base station; The synchronization reference of one or more carriers included in Set A is determined, and one of the carriers with the highest priority is selected as the synchronization carrier according to the following selection priority order (P1 to P6).

[0314] P1: A carrier whose synchronization reference is SyncRef UE, and whose SLSS ID belongs to the SLSS ID set / partial set defined in the coverage, and whose coverage indication parameter indicates that it is true. P2: A carrier whose synchronization reference is SyncRef UE and whose SLSS ID belongs to the SLSS ID set / partial set defined in the coverage, and whose coverage indication parameter indicates false. P3: 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: 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: 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 P1, P2, P3, P4, P5, and P6 in descending order.

[0315] It should be noted that if there are multiple carriers that meet the conditions, the UE will autonomously select 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] Illustratively, 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 met: 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] Illustratively, 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 met: the synchronization reference type parameter (sl-SyncPriority) is configured / pre-configured by the network as GNSS, and GNSS is unreliable; The synchronization reference of one or more carriers included in Set A is determined, and one carrier with the highest selection priority is selected as the synchronization carrier according to the following selection priority order (P1 to P6).

[0319] P1: A carrier whose synchronization reference is SyncRef UE, and whose SLSS ID belongs to the SLSS ID set / partial set defined in the coverage, and whose coverage indication parameter indicates that it is true. P2: A carrier whose synchronization reference is SyncRef UE and whose SLSS ID belongs to the SLSS ID set / partial set defined in the coverage, and whose coverage indication parameter indicates false. P3: 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: 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: 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 P1, P2, P3, P4, P5, and P6 in descending order.

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

[0321] Illustratively, 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, if the first carrier set is an empty set, the UE determines a synchronization reference for each carrier selected for CA transmission.

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

[0324] Optionally, if the synchronization reference type parameter is GNSS, Illustratively, 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 met: the synchronization reference priority order (sl-NbAsSync) of the CA carrier pre-configured / configured by the network / selected by the UE / SL transmission carrier / multiple carriers / at least two carriers / Set A / Set B / at least some carriers in the first carrier set is different; From the carriers included in SetA, one carrier with reliable GNSS is selected as the synchronization carrier.

[0325] Illustratively, 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 unreliable; If at least one of the following conditions is met: the synchronization reference priority order (sl-NbAsSync) of the CA carrier pre-configured / configured by the network / selected by the UE / SL transmission carrier / multiple carriers / at least two carriers / Set A / Set B / at least some carriers in the first carrier set is different; The synchronization reference of one or more carriers included in Set A is determined, and one carrier with the highest selection priority is selected as the synchronization carrier according to the following selection priorities (P1 to P6).

[0326] P1: A carrier whose synchronization reference is SyncRef UE, and whose SLSS ID belongs to the SLSS ID set / partial set defined in the coverage, and whose coverage indication parameter indicates that it is true. P2: A carrier whose synchronization reference is SyncRef UE and whose SLSS ID belongs to the SLSS ID set / partial set defined in the coverage, and whose coverage indication parameter indicates false. P3: 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: 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: 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 P1, P2, P3, P4, P5, and P6 in descending order.

[0327] The flow of determining a synchronization carrier based on synchronization reference priority will be described below using an example 1.

[0328] Example 1: Illustratively, 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 unreliable; If at least one of the following conditions is met: the synchronization reference priority order (sl-NbAsSync) of the CA carrier pre-configured / configured by the network / selected by the UE / SL transmission carrier / multiple carriers / at least two carriers / Set A / Set B / at least some carriers in the 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 the carrier with the highest selection priority is selected as the synchronization carrier.

[0329] P1: A carrier whose synchronization reference is SyncRef UE, and whose SLSS ID belongs to the SLSS ID set / partial set defined in the coverage, and whose coverage indication parameter indicates that it is true. P2: A carrier whose synchronization reference is SyncRef UE and whose SLSS ID belongs to the SLSS ID set / partial set defined in the coverage, and whose coverage indication parameter indicates false. P3: 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: 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: 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] If 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 carriers are P6, the UE selects the carriers whose corresponding selection priorities are P6 as 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] Illustratively, the above selection priority order is obtained based on the synchronization reference priority, for example, a carrier with a higher synchronization reference priority has a higher selection priority.

[0334] The flow of determining the synchronization carrier based on the synchronization reference priority order will be described below by way of an example.

[0335] Example 2: Illustratively, 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 unreliable; If at least one of the following conditions is met: the synchronization reference priority order (sl-NbAsSync) of the CA carrier pre-configured / configured by the network / selected by the UE / SL transmission carrier / multiple carriers / at least two carriers / Set A / Set B / at least some carriers in the 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 the carrier with the highest selection priority is selected as the synchronization carrier.

[0336] P1: A carrier whose synchronization reference is SyncRef UE, and whose SLSS ID belongs to the SLSS ID set / partial set defined in the coverage, and whose coverage indication parameter indicates that it is true. P2: A carrier whose synchronization reference is SyncRef UE and whose SLSS ID belongs to the SLSS ID set / partial set defined in the coverage, and whose coverage indication parameter indicates false. P3: 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: 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: 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] For example, 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 the carrier with a higher synchronization reference priority in the overlapping part is higher, if the priority corresponding to at least one carrier is P1, P2, or P6, the UE selects the carrier with the higher selection priority from those corresponding to selection priorities P1, P2, or P6 as the synchronization carrier.

[0338] For example, the conditions for determining the selection priority include: when there is an overlapping portion in the synchronization reference priority order and the selection priority corresponding to the carrier with a higher synchronization reference priority in the non-overlapping portion is high, if there is no carrier with a corresponding selection priority of P1, P2, or P6, i.e., the selection priorities corresponding to all carriers are P3, P4, or P5, the UE selects a carrier with a higher selection priority from those with a corresponding selection priority of P3, P4, or 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 unreliable; If at least one of the following conditions is met: the synchronization reference priority order (sl-NbAsSync) of the CA carrier pre-configured / configured by the network / selected by the UE / SL transmission carrier / multiple carriers / at least two carriers / Set A / Set B / at least some carriers in the first carrier set is different; The UE determines the synchronization references of one or more carriers included in Set A, and 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 references obtained based on the synchronization reference priority order configured by the carriers, the UE determines a synchronization reference for each carrier individually.

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

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

[0342] For example, 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. One carrier is selected as a synchronization carrier from one or more carriers included in Set A.

[0343] Illustratively, the carrier selected by the UE for CA transmission is: The carrier is in a pre-configured 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 a base station; The synchronization reference of one or more carriers included in Set A is determined, and one of the carriers with 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: 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 whose synchronization reference is SyncRef UE, whose SLSS ID is 337, and whose coverage indication parameter is false. P3: Carrier whose synchronization reference is gNB / eNB P4: 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 whose synchronization reference is SyncRef UE and whose SLSS ID belongs to the SLSS ID set / partial set defined in the coverage, and whose coverage indication parameter indicates false. P6: Carrier whose synchronization reference is another SyncRef UE As can be seen, the selection priority order is P1, P2, P3, P4, P5, and P6 in descending order.

[0345] It should be noted that if there are multiple carriers that meet the conditions, the UE will autonomously select 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] Illustratively, 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 met: 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] Illustratively, 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 met: the synchronization reference type parameter (sl-SyncPriority) is configured / pre-configured by the network as GNSS, and GNSS is unreliable; The synchronization reference of one or more carriers included in Set A is determined, and one carrier with the highest selection priority is selected as the 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: 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 whose synchronization reference is SyncRef UE, whose SLSS ID is 337, and whose coverage indication parameter is false. P3: Carrier whose synchronization reference is gNB / eNB P4: 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 whose synchronization reference is SyncRef UE and whose SLSS ID belongs to the SLSS ID set / partial set defined in the coverage, and whose coverage indication parameter indicates false. P6: Carrier whose synchronization reference is another SyncRef UE As can be seen, the selection priority order is P1, P2, P3, P4, P5, and P6 in descending order.

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

[0351] Illustratively, 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, if the first carrier set is an empty set, the UE determines a synchronization reference for each carrier selected for CA transmission.

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

[0354] Optionally, if the synchronization reference type parameter is GNSS, Illustratively, 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 met: the synchronization reference priority order (sl-NbAsSync) of the CA carrier pre-configured / configured by the network / selected by the UE / SL transmission carrier / multiple carriers / at least two carriers / Set A / Set B / at least some carriers in the first carrier set is different; From the carriers included in SetA, one carrier with reliable GNSS is selected as the synchronization carrier.

[0355] Illustratively, 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 unreliable; If at least one of the following conditions is met: the synchronization reference priority order (sl-NbAsSync) of the CA carrier pre-configured / configured by the network / selected by the UE / SL transmission carrier / multiple carriers / at least two carriers / Set A / Set B / at least some carriers in the first carrier set is different; The synchronization reference of one or more carriers included in Set A is determined, and one carrier with the highest selection priority is selected as the 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: 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 whose synchronization reference is SyncRef UE, whose SLSS ID is 337, and whose coverage indication parameter is false. P3: Carrier whose synchronization reference is gNB / eNB P4: 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 whose synchronization reference is SyncRef UE and whose SLSS ID belongs to the SLSS ID set / partial set defined in the coverage, and whose coverage indication parameter indicates false. P6: Carrier whose synchronization reference is another SyncRef UE As can be seen, the selection priority order is P1, P2, P3, P4, P5, and P6 in descending order.

[0357] As can be seen, the selection priority order is P1, P2, P3, P4, P5, and P6 in descending order.

[0358] The flow of determining a synchronization carrier based on synchronization reference priority will be described below using an example 1.

[0359] Example 1: Illustratively, 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 unreliable; If at least one of the following conditions is met: the synchronization reference priority order (sl-NbAsSync) of the CA carrier pre-configured / configured by the network / selected by the UE / SL transmission carrier / multiple carriers / at least two carriers / Set A / Set B / at least some carriers in the 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 the carrier 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: 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 whose synchronization reference is SyncRef UE, whose SLSS ID is 337, and whose coverage indication parameter is false. P3: Carrier whose synchronization reference is gNB / eNB P4: 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 whose synchronization reference is SyncRef UE and whose SLSS ID belongs to the SLSS ID set / partial set defined in the coverage, and whose coverage indication parameter indicates false. P6: Carrier whose synchronization reference is another SyncRef UE As can be seen, the selection priority order is P1, P2, P3, P4, P5, and P6 in descending order.

[0361] The rules are as follows:

[0362] If 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 carriers are P6, the UE selects the carriers whose corresponding selection priorities are P6 as 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] Illustratively, the above selection priority order is obtained based on the synchronization reference priority, for example, a carrier with a higher synchronization reference priority has a higher selection priority.

[0366] The flow of determining the synchronization carrier based on the synchronization reference priority order will be described below by way of an example.

[0367] Example 2: Illustratively, 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 unreliable; If at least one of the following conditions is met: the synchronization reference priority order (sl-NbAsSync) of the CA carrier pre-configured / configured by the network / selected by the UE / SL transmission carrier / multiple carriers / at least two carriers / Set A / Set B / at least some carriers in the 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 the carrier 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: 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 whose synchronization reference is SyncRef UE, whose SLSS ID is 337, and whose coverage indication parameter is false. P3: Carrier whose synchronization reference is gNB / eNB P4: 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 whose synchronization reference is SyncRef UE and whose SLSS ID belongs to the SLSS ID set / partial set defined in the coverage, and whose coverage indication parameter indicates false. P6: Carrier whose synchronization reference is another SyncRef UE As can be seen, the selection priority order is P1, P2, P3, P4, P5, and P6 in descending order.

[0369] The rules are as follows:

[0370] For example, 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 the carrier with a higher synchronization reference priority in the overlapping part is higher, if the priority corresponding to at least one carrier is P1, P2, or P6, the UE selects the carrier with the higher selection priority from those corresponding to selection priorities P1, P2, or P6 as the synchronization carrier.

[0371] For example, the conditions for determining the selection priority include: when there is an overlapping portion in the synchronization reference priority order and the selection priority corresponding to the carrier with a higher synchronization reference priority in the non-overlapping portion is high, if there is no carrier with a corresponding selection priority of P1, P2, or P6, i.e., the selection priorities corresponding to all carriers are P3, P4, or P5, the UE selects a carrier with a higher selection priority from those with a corresponding selection priority of P3, P4, or 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 unreliable; If at least one of the following conditions is met: the synchronization reference priority order (sl-NbAsSync) of the CA carrier pre-configured / configured by the network / selected by the UE / SL transmission carrier / multiple carriers / at least two carriers / Set A / Set B / at least some carriers in the first carrier set is different; The UE determines the synchronization references of one or more carriers included in Set A, and 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 references obtained based on the synchronization reference priority order configured by the carriers, the UE determines a synchronization reference for each carrier individually.

[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 will be described by taking the carrier determination device executing the carrier determination method as an example.

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

[0375] In some possible embodiments, the first condition is: The synchronization reference orders of at least some of the carriers are the same, or the synchronization reference orders of at least some of the carriers are different; 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 indication information of at least some of the carriers is the same, or the first indication 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; Here, the first instruction information is Whether at least one specific synchronization reference needs to be monitored, and Whether at least one particular synchronization reference needs to be skipped, and whether to synchronize directly or indirectly 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 within 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; The synchronization reference priority indication information of at least some of the carriers is the same; 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; 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, and Whether at least one particular synchronization reference needs to be skipped, and whether to synchronize directly or indirectly 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 within 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 and PSFCH configuration and SCS configuration and the synchronization resource it contains; 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, and Whether at least one particular synchronization reference needs to be skipped, and whether to synchronize directly or indirectly to at least one particular synchronization reference; The synchronization reference order is: a priority or priority group order of synchronization references; The priority order of the services; A priority order of 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 within 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 set; and a third carrier set; 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.

[0380] In some possible embodiments, the determination module 301 is specifically used to determine 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; Signal quality is the eight determining a carrier that satisfies the above condition as the second carrier; The searched time is Nine determining a carrier that satisfies the above 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 disabled as the second carrier; determining a carrier whose periodicity of a PSFCH configuration satisfies a fourth condition as the second carrier; determining a carrier whose resource pool satisfies a fifth condition as the second carrier; determining a carrier whose second priority satisfies a sixth condition as the second carrier; 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 synchronization references; 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 synchronization 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 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 synchronization reference type priority; 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 are: The carrier with the largest period in 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 PSFCH resources; a carrier including at least one resource pool that does not have a PSFCH resource; a carrier including a resource pool that does not have any PSFCH resources; and a carrier each including a resource pool having PSFCH resources; and / or Carriers that meet the sixth condition are: 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 synchronization slots in a period, The carrier with the smallest number of synchronization slots in a period, A carrier having a predetermined number of synchronization slots within 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 in which the number of repetitions of a synchronization signal is a predetermined number; The carrier with the largest synchronous slot offset, The carrier with the smallest synchronous slot offset, a carrier whose synchronization slot offset amount is 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 and The SCS includes at least one of a carrier that is a predetermined 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 with 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 with the 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 a carrier having a third selection priority as the second carrier.

[0386] In some possible embodiments, the selection priority is: The contracts stipulated by the Protocol, A network consisting of: 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 and PSFCH configuration and 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 and PSFCH configuration and 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, and Whether at least one particular synchronization reference needs to be skipped, and whether to synchronize directly or indirectly to at least one particular synchronization reference; and / or The synchronization reference order is: a priority or priority group order of synchronization references; The priority order of the services; A priority order of 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 synchronization references; 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 synchronization 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: 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 following:

[0390] In some possible embodiments, the selection priority order is: A selection priority corresponding to a carrier with a high synchronization reference priority is higher than a selection priority corresponding to a carrier with a low synchronization reference priority, or is lower than a selection priority corresponding to a carrier with a low synchronization reference priority; The synchronization reference priority order corresponding to 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 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 an 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 the 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 is a predetermined PSFCH configuration; and 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 longer 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 in a period is higher or lower than a selection priority corresponding to a carrier having a second number of synchronization slots in a period, said first value being greater 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 rate of a synchronization signal is higher or lower than a selection priority corresponding to a carrier having a fourth value of repetition rate of a synchronization signal, the third value being greater 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 the carrier of a first time interval of the synchronization signal is higher or lower than the selection priority corresponding to the 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 the second carrier set; a carrier in the third career set; All carriers that can be used for carrier aggregation CA transmission; The carrier actually used for CA transmission, The carriers that were once selected for CA transmission, All carriers that can be used in multicarrier transmission; The 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 that were 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.

[0395] In some possible embodiments, the fourth carrier comprises: a carrier in the second carrier set; a carrier in the third career set; All carriers that can be used for carrier aggregation CA transmission; The carrier actually used for CA transmission, The carriers that were once selected for CA transmission, All carriers that can be used in multicarrier transmission; The 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 that were 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 a carrier determination device according to an embodiment of the present application, the device 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 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 plurality of third carriers are used for sidelink SL transmission, the plurality of first carriers satisfying a first condition and the plurality of third carriers satisfying a second condition. In 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, thereby achieving timing synchronization of each carrier when performing sidelink data transmission, thereby improving the reliability of the communication system.

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

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

[0399] Optionally, as shown in Fig. 4, an 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, if the communication device 400 is a terminal, when the program or instruction is executed by the processor 401, it can realize each step of the embodiment of the carrier determination method and achieve the same technical effect. If the communication device 400 is a network-side device, when the program or instruction is executed by the processor 401, it can realize each step of the embodiment of the carrier determination method and achieve the same technical effect, and in order to avoid repetition, it will not be further described here.

[0400] An embodiment of the present application further provides a terminal, the terminal including a processor and a communication interface, the processor being used to determine a second 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 third carrier, and / or the second carrier is used for sidelink (SL) transmission. This embodiment of the terminal corresponds to an embodiment of the method on the terminal side, and the implementation processes and realization manners of the method embodiments can be applied to this embodiment of the terminal, and the same technical effects can be achieved. Specifically, Figure 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 components such as, but 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 will 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, thereby enabling the power management system to realize functions such as charge / discharge management and power consumption management. The structure of the terminal shown in Figure 5 does not constitute a limitation on the terminal, and the terminal may include more or fewer components than those 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 captured 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, which may be configured in the form of a liquid crystal display, an organic light-emitting diode, or the like. 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 a control lever, which will not be further described herein.

[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 also transmit uplink data to the network side device. Generally, 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. Here, the first storage area may store an operating system, an application program or instructions necessary for at least one function (e.g., an audio playback function, an image playback function, etc.), etc. The memory 509 may include volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. Here, the nonvolatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory may be random access memory (RAM), static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct Rambus random access memory (DRRAM). Memory 509 in embodiments of the present application includes, 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 may integrate an application processor and a modem processor, where the application processor mainly processes operations related to the operating system, user interface, application programs, etc., and the modem processor mainly processes wireless communication signals, e.g., a baseband processor. As can be appreciated, 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 based on 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 plurality of third carriers are used for sidelink (SL) transmission; the plurality of first carriers satisfy a first condition; The plurality of third carriers satisfy a second condition.

[0408] In some possible embodiments, the first condition is: The synchronization reference orders of at least some of the carriers are the same, or the synchronization reference orders of at least some of the carriers are different; 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 indication information of at least some of the carriers is the same, or the first indication 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; Here, the first instruction information is Whether at least one specific synchronization reference needs to be monitored, and Whether at least one particular synchronization reference needs to be skipped, and whether to synchronize directly or indirectly 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 within 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; The synchronization reference priority indication information of at least some of the carriers is the same; 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; 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, and Whether at least one particular synchronization reference needs to be skipped, and whether to synchronize directly or indirectly 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 within 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 and PSFCH configuration and SCS configuration and the synchronization resource it contains; 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, and Whether at least one particular synchronization reference needs to be skipped, and whether to synchronize directly or indirectly to at least one particular synchronization reference; The synchronization reference order is: a priority or priority group order of synchronization references; The priority order of the services; A priority order of 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 within 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 set; and a third carrier set; 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.

[0413] In some possible embodiments, the processor 510 is specifically used 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; Signal quality is the eight determining a carrier that satisfies the above condition as the second carrier; The searched time is Nine determining a carrier that satisfies the above 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 disabled as the second carrier; determining a carrier whose periodicity of a PSFCH configuration satisfies a fourth condition as the second carrier; determining a carrier whose resource pool satisfies a fifth condition as the second carrier; determining a carrier whose second priority satisfies a sixth condition as the second carrier; 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 synchronization references; 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 synchronization 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 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 synchronization reference type priority; 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 are: The carrier with the largest period in 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 PSFCH resources; a carrier including at least one resource pool that does not have a PSFCH resource; a carrier including a resource pool that does not have any PSFCH resources; and a carrier each including a resource pool having PSFCH resources; and / or Carriers that meet the sixth condition are: 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 synchronization slots in a period, The carrier with the smallest number of synchronization slots in a period, A carrier having a predetermined number of synchronization slots within 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 in which the number of repetitions of a synchronization signal is a predetermined number; The carrier with the largest synchronous slot offset, The carrier with the smallest synchronous slot offset, a carrier whose synchronization slot offset amount is 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 and The SCS includes at least one of a carrier that is a predetermined 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 with 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 with the 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 a carrier having a third selection priority as the second carrier.

[0419] In some possible embodiments, the selection priority is: The contracts stipulated by the Protocol, A network consisting of: 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 and PSFCH configuration and 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 and PSFCH configuration and 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, and Whether at least one particular synchronization reference needs to be skipped, and whether to synchronize directly or indirectly to at least one particular synchronization reference; and / or The synchronization reference order is: a priority or priority group order of synchronization references; The priority order of the services; A priority order of 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 synchronization references; 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 synchronization 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: 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 following:

[0423] In some possible embodiments, the selection priority order is: A selection priority corresponding to a carrier with a high synchronization reference priority is higher than a selection priority corresponding to a carrier with a low synchronization reference priority, or is lower than a selection priority corresponding to a carrier with a low synchronization reference priority; The synchronization reference priority order corresponding to 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 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 an 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 the 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 is a predetermined PSFCH configuration; and 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 longer 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 in a period is higher or lower than a selection priority corresponding to a carrier having a second number of synchronization slots in a period, said first value being greater 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 rate of a synchronization signal is higher or lower than a selection priority corresponding to a carrier having a fourth value of repetition rate of a synchronization signal, the third value being greater 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 the carrier of a first time interval of the synchronization signal is higher or lower than the selection priority corresponding to the 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 the second carrier set; a carrier in the third career set; All carriers that can be used for carrier aggregation CA transmission; The carrier actually used for CA transmission, The carriers that were once selected for CA transmission, All carriers that can be used in multicarrier transmission; The 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 that were 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.

[0428] In some possible embodiments, the fourth carrier comprises: a carrier in the second carrier set; a carrier in the third career set; All carriers that can be used for carrier aggregation CA transmission; The carrier actually used for CA transmission, The carriers that were once selected for CA transmission, All carriers that can be used in multicarrier transmission; The 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 that were 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 a terminal according to an 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 plurality of first 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 for sidelink SL transmission, the plurality of first carriers satisfying a first condition and the plurality of third carriers satisfying a second condition. In this manner, 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, thereby realizing timing synchronization of each carrier when performing sidelink data transmission, thereby improving the reliability of the communication system.

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

[0431] Wherein, the processor is the processor in the terminal described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0432] An embodiment of the present application further 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 instruction to 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, no further description will be given here.

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

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

[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 the steps of the carrier determination method described above.

[0436] It should be noted that, in this specification, the terms "comprise," "include," "includes," or any other variations thereof are intended to cover the non-exclusive "comprise," whereby a process, method, article, or apparatus comprising a set of elements not only includes those elements, but also other elements not expressly listed or inherent in such process, method, article, or apparatus. Absent further limitations, an element defined by the phrase "comprises one of" does not preclude the presence of other identical elements in the process, method, article, or apparatus comprising that element. It should be noted that the scope of the methods and apparatuses 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 the reverse order based on the functions involved. For example, the described method may be performed in a different order than described, and various steps may be added, omitted, or combined. Furthermore, features described with reference to some examples may be combined in other examples.

[0437] As will be apparent to those skilled in the art from the above description of the embodiments, 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. Based on this understanding, the technical proposal of the present application, in substance or in part contributing 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 a number of instructions for causing a terminal (which may be a mobile phone, computer, server, air conditioner, network device, etc.) to execute the methods described in each embodiment of the present application.

[0438] Although the embodiments of the present application have been described above in conjunction with the drawings, 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 implement many forms under the guidance of the present application without departing from the spirit and scope of the claims, and all forms fall within the scope of protection of the present application.

[0439] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority from 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-making method, comprising: The terminal determines a plurality of third carriers from the plurality of first carriers based on first information of at least some of the carriers; wherein the plurality of third carriers are used for sidelink (SL) transmission; the plurality of first carriers satisfy a first condition; the plurality of third carriers satisfy a second condition; The first condition is: The synchronization reference order of at least some of the carriers is the same; The synchronization reference priority indication 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 The SCS configurations of at least some of the carriers are the same; 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; The second condition is: The synchronization reference order of at least some of the carriers is the same; The synchronization reference priority indication 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 The SCS configurations of at least some of the carriers are the same; 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; 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; Career decision making methods.

2. The method further includes the terminal determining a second carrier from the plurality of first carriers based on the first information of at least some of the plurality of first carriers; wherein the second carrier is used to determine synchronization information of the second carrier and / or synchronization information of a fourth carrier; the fourth carrier includes at least one of a carrier in the 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, a carrier once selected for CA transmission, all carriers that can be used for multi-carrier transmission, a carrier actually used for multi-carrier transmission, a carrier once selected for multi-carrier transmission, all carriers that can be used for SL transmission, a carrier actually used for SL transmission, a carrier once selected for SL transmission, and a carrier including synchronization resources; 2. The carrier determination method of claim 1, wherein the second carrier set includes carriers that can be used as synchronization carriers, and the third carrier set includes an available synchronization carrier set.

3. The first information is Synchronous reference order; Synchronous reference priority indication information; a first instruction; a HARQ configuration; PSFCH configuration; SCS configuration and the synchronization resource it contains; 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, and Whether at least one particular synchronization reference needs to be skipped, and whether to synchronize directly or indirectly to at least one particular synchronization reference; The synchronization reference order is: a priority or priority group order of synchronization references; The priority order of the services; A priority order of 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 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; 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 number of repetitions of the synchronization signal, a synchronization slot offset amount, a time interval of the synchronization signal, and an SCS; The carrier determination method according to claim 1 , wherein the SCS includes at least one of an SCS of a synchronization signal and an SCS of a carrier.

4. 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 set; and a third carrier set; 2. The carrier determination method of claim 1, wherein the second carrier set includes carriers that can be used as synchronization carriers, and the third carrier set includes an available synchronization carrier set.

5. 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. This includes: Here, the first rule is: determining the second carrier based on a selection priority; determining a carrier whose signal quality satisfies an eighth condition as the second carrier; determining a carrier that satisfies a ninth condition at the time of the search 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 disabled as the second carrier; determining a carrier whose periodicity of a PSFCH configuration satisfies a fourth condition as the second carrier; determining a carrier whose resource pool satisfies a fifth condition as the second carrier; determining a carrier whose second priority satisfies a sixth condition as the second carrier; Here, the second priority is: a priority or priority group of synchronization references; 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 synchronization slot offset amount; the time interval of the synchronization signal; 3. The carrier determination method according to claim 2, wherein the SCS includes at least one of an SCS of an S-SSB and an SCS of a carrier.

6. Carriers that meet the eighth 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 ninth condition above are: The carrier with the earliest search time, The carrier with the latest search time and 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 synchronization reference type priority; 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 are: the carrier with the largest period of the PSFCH configuration; the carrier with the smallest periodicity 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 PSFCH resources; 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 Carriers that meet the sixth condition are: The carrier with the highest priority The carrier with the lowest priority, 6. The carrier determination method according to claim 5, wherein the carrier includes at least one of a carrier having a predetermined priority.

7. The terminal determining the second carrier from a plurality of first carriers comprises: The terminal determines a second carrier from a plurality of first carriers based on a first rule; wherein the first rule includes determining, as the second carrier, a carrier whose synchronization resource satisfies a seventh condition; 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 synchronization slots in a period, The carrier with the smallest number of synchronization slots in a period, A carrier having a predetermined number of synchronization slots within 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 in which the number of repetitions of a synchronization signal is a predetermined number; The carrier with the largest synchronous slot offset, The carrier with the smallest synchronous slot offset, a carrier whose synchronization slot offset amount is 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 carrier determination method according to claim 5 , wherein the SCS includes at least one of a carrier that is a predetermined SCS.

8. 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.

9. determining the second carrier based on a selection priority; determining a carrier with 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 with the 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 a carrier having a selection priority of third as the second carrier.

10. The selection priority is: The contracts stipulated by the Protocol, A network consisting of: 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; PSFCH configuration; SCS configuration and Synchronization resources; a carrier frequency point; 6. The carrier determination method according to claim 5, wherein the carrier is determined based on at least one of a carrier index and a carrier frequency index.

11. 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; PSFCH configuration; SCS configuration and Synchronization resources; a carrier frequency point; 9. The carrier determination method according to claim 8, wherein the carrier is determined based on at least one of a carrier index and a carrier frequency index.

12. The selection priority order is: 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; 9. The carrier determination method according to claim 8, wherein the carrier is determined based on at least one of the following: an arrangement order of the carriers.

13. The selection priority order is: A selection priority corresponding to a carrier with a high synchronization reference priority is higher than a selection priority corresponding to a carrier with a low synchronization reference priority, or is lower than a selection priority corresponding to a carrier with a low synchronization reference priority; The synchronization reference priority order corresponding to 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; 9. The carrier determination method of claim 8, 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.

14. 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 a 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 the carrier of a first SCS is higher or lower than the selection priority corresponding to the carrier of a second SCS, or the first SCS is higher than the second SCS, and / or the first SCS is a predetermined SCS; Or, 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 longer 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 in a period is higher or lower than a selection priority corresponding to a carrier having a second number of synchronization slots in a period, said first value being greater 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 greater 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; a selection priority corresponding to a carrier of a first time interval of a synchronization signal is higher or lower than a selection priority corresponding to a carrier of a second time interval, the first time interval being longer than the second time interval, and / or the first time interval being a predetermined time interval; The carrier decision method according to claim 8.

15. 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 14 when executed by the processor.

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