Sidelink communication method and communication device

Abstract

The present application relates to a sidelink communication method and a communication device. The method comprises: a first communication device selects a transmission resource from among a sidelink multi-carrier resource on the basis of the number of available carrier components. According to embodiments of the present application, the transmission resource is selected on the basis of the number of available carrier components, thereby improving the performance of a communication system, and improving the resource utilization efficiency.

Description

Sideline communication method and communication device Technical Field

[0001] The present application relates to the field of communications, and more specifically, to a sideline communication method and communication device. Background Art

[0002] In sideline communication, depending on the network coverage of the communicating terminal, it can include sideline communication within network coverage, sideline communication with partial network coverage, and sideline communication outside network coverage. In sideline communication, carrier aggregation can be supported on dedicated frequency bands or licensed frequency bands.

[0003] Summary of the Invention

[0004] The embodiments of the present application provide a side communication method and communication device, which can reduce resource waste.

[0005] The present invention provides a sideline communication method, including:

[0006] The first communication device selects transmission resources from the sidelink multi-carrier resources according to the number of available carrier components.

[0007] An embodiment of the present application provides a first communication device, including:

[0008] The first processing unit is configured to select a transmission resource from the sidelink multi-carrier resources according to the number of available carrier components.

[0009] An embodiment of the present application provides a communication device, comprising: a transceiver, a processor, and a memory. The memory is used to store a computer program, the transceiver is used to communicate with other devices, and the processor is used to call and execute the computer program stored in the memory, so that the communication device performs the above-mentioned sideline communication method.

[0010] An embodiment of the present application provides a chip for implementing the above-mentioned side communication method.

[0011] Specifically, the chip includes: a processor, which is used to call and run a computer program from a memory, so that a device equipped with the chip executes the above-mentioned sideline communication method.

[0012] An embodiment of the present application provides a computer-readable storage medium for storing a computer program. When the computer program is executed by a device, the device executes the above-mentioned sideline communication method.

[0013] An embodiment of the present application provides a computer program product, including computer program instructions, which enable a computer to execute the above-mentioned sideline communication method.

[0014] An embodiment of the present application provides a computer program, which, when executed on a computer, enables the computer to execute the above-mentioned sideline communication method.

[0015] In the embodiment of the present application, transmission resources are selected based on the number of available carrier components, which can improve communication system performance and resource utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG1 is a schematic diagram of network coverage inner line communication according to an embodiment of the present application.

[0017] FIG2 is a schematic diagram of sideline communication with partial network coverage according to an embodiment of the present application.

[0018] FIG3 is a schematic diagram of network coverage outside communication according to an embodiment of the present application.

[0019] FIG4 is a schematic diagram of sideline communication with a central control node according to an embodiment of the present application.

[0020] FIG5 is a schematic diagram of a unicast transmission mode.

[0021] FIG6 is a schematic diagram of a multicast transmission mode.

[0022] FIG7 is a schematic diagram of a broadcast transmission mode.

[0023] FIG8 is an example diagram of channel occupancy.

[0024] 9A, 9B, and 9C are diagrams showing examples of access channels.

[0025] FIG10A is a schematic flowchart of a sideline communication method according to an embodiment of the present application.

[0026] FIG10B is a schematic diagram of a resource selection method for NR-V2X listening.

[0027] FIG11 is a schematic flowchart of a sideline communication method according to another embodiment of the present application.

[0028] FIG12 is a schematic flowchart of a sideline communication method according to another embodiment of the present application.

[0029] FIG13 is a schematic diagram of Example 1. FIG.

[0030] FIG14 is a schematic diagram of Example 2.

[0031] FIG15 is a schematic diagram of Example 3.

[0032] FIG16 is a schematic diagram of Example 4.

[0033] FIG17 is a schematic diagram of Example 5.

[0034] FIG18 is a schematic diagram of Example 6.

[0035] FIG19 is a schematic diagram of Example 7.

[0036] FIG20 is a schematic block diagram of a first communication device according to an embodiment of the present application.

[0037] Figure 21 is a schematic block diagram of a communication device according to an embodiment of the present application.

[0038] Figure 22 is a schematic block diagram of a chip according to an embodiment of the present application.

[0039] Figure 23 is a schematic block diagram of a communication system according to an embodiment of the present application. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0041] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: Long Term Evolution (LTE) system, Advanced Long Term Evolution (LTE-A) system, New Radio (NR) system, NR system evolution system, LTE on unlicensed spectrum (LTE-U) system, NR on unlicensed spectrum (NR-based access to unlicensed spectrum, NR-U) system, Non-Terrestrial Networks (NTN) system, Universal Mobile Telecommunication System (UMTS), Wireless Local Area Networks (WLAN), Wireless Fidelity (WiFi), Fifth Generation (5G) system or other communication systems.

[0042] Generally speaking, traditional communication systems support a limited number of connections and are easy to implement. However, with the development of communication technology, mobile communication systems will not only support traditional communications, but will also support, for example, device-to-device (D2D) communication, machine-to-machine (M2M) communication, machine-type communication (MTC), vehicle-to-vehicle (V2V) communication, or vehicle-to-everything (V2X) communication, etc. The embodiments of the present application can also be applied to these communication systems.

[0043] In one embodiment, the communication system in the embodiment of the present application can be applied to a carrier aggregation (CA) scenario, a dual connectivity (DC) scenario, and a standalone (SA) networking scenario.

[0044] In one embodiment, the communication system in the embodiment of the present application can be applied to an unlicensed spectrum, wherein the unlicensed spectrum can also be considered as a shared spectrum; or, the communication system in the embodiment of the present application can also be applied to an authorized spectrum, wherein the authorized spectrum can also be considered as an unshared spectrum.

[0045] The embodiments of the present application describe various embodiments in conjunction with network devices and terminal devices, wherein the terminal device may also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device, etc.

[0046] The terminal device can be a station (STAION, ST) in a WLAN, a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA) device, a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a next-generation communication system such as an NR network, or a terminal device in a future evolved Public Land Mobile Network (PLMN) network, etc.

[0047] In an embodiment of the present application, the terminal device can be deployed on land, including indoors or outdoors, handheld, wearable or vehicle-mounted; it can also be deployed on the water surface (such as ships, etc.); it can also be deployed in the air (such as airplanes, balloons and satellites, etc.).

[0048] In the embodiment of the present application, the terminal device can be a mobile phone, a tablet computer, a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, or a wireless terminal device in a smart home, etc.

[0049] As an example and not a limitation, in the embodiment of the present application, the terminal device may also be a wearable device. Wearable devices may also be called wearable smart devices, which are a general term for wearable devices that are intelligently designed and developed using wearable technology for daily wear, such as glasses, gloves, watches, clothing, and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothes or accessories. Wearable devices are not only hardware devices, but also achieve powerful functions through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include those that are fully functional, large in size, and can achieve complete or partial functions without relying on smartphones, such as smart watches or smart glasses, as well as those that only focus on a certain type of application function and need to be used in conjunction with other devices such as smartphones, such as various smart bracelets and smart jewelry for vital sign monitoring.

[0050] In an embodiment of the present application, the network device may be a device for communicating with a mobile device. The network device may be an access point (AP) in a WLAN, an evolved base station (eNB or eNodeB) in LTE, or a relay station or access point, or a vehicle-mounted device, a wearable device, and a network device (gNB) in an NR network, or a network device in a future evolved PLMN network or a network device in an NTN network, etc.

[0051] As an example and not a limitation, in an embodiment of the present application, the network device may have a mobile feature, for example, the network device may be a mobile device. Alternatively, the network device may be a satellite or a balloon station. For example, the satellite may be a low earth orbit (LEO) satellite, a medium earth orbit (MEO) satellite, a geostationary earth orbit (GEO) satellite, a high elliptical orbit (HEO) satellite, etc. Optionally, the network device may also be a base station set up in a location such as land or water.

[0052] In an embodiment of the present application, the network device can provide services for a cell, and the terminal device communicates with the network device through the transmission resources used by the cell (for example, frequency domain resources, or spectrum resources). The cell can be a cell corresponding to the network device (for example, a base station). The cell can belong to a macro base station or a base station corresponding to a small cell. The small cells here may include: metro cells, micro cells, pico cells, femto cells, etc. These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services.

[0053] It should be understood that the terms "system" and "network" are often used interchangeably herein. The term "and / or" is simply a description of an association between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " generally indicates that the related objects are in an "or" relationship.

[0054] It should be understood that the "indication" mentioned in the embodiments of this application can be a direct indication, an indirect indication, or an indication of an association. For example, "A indicates B" can mean that A directly indicates B, for example, B can be obtained through A; it can also mean that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also mean that there is an association between A and B.

[0055] In the description of the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between the two, or an association relationship between the two, or a relationship between indication and being indicated, configuration and being configured, etc.

[0056] To facilitate understanding of the technical solutions of the embodiments of the present application, the relevant technologies of the embodiments of the present application are described below. The following relevant technologies can be arbitrarily combined with the technical solutions of the embodiments of the present application as optional solutions, and they all fall within the protection scope of the embodiments of the present application.

[0057] 1. Sideline Communication in Different Network Coverage Environments

[0058] In sideline communication, according to the network coverage of the communicating terminals, it can be divided into sideline communication within network coverage, sideline communication with partial network coverage, and sideline communication outside network coverage, as shown in Figures 1, 2, 3 and 4 respectively.

[0059] Figure 1: In sideline communications within network coverage, all terminals performing sideline communications are within the coverage of the same base station. Thus, all of the above terminals can perform sideline communications based on the same sideline configuration by receiving configuration signaling from the base station.

[0060] Figure 2: In the case of partial network coverage and sidelink communication, some terminals performing sidelink communication are within the coverage of the base station. These terminals can receive configuration signaling from the base station and perform sidelink communication according to the base station's configuration. However, terminals outside the network coverage cannot receive configuration signaling from the base station. In this case, terminals outside the network coverage will determine the sidelink configuration based on pre-configuration information and information carried in sidelink broadcast channels, such as the Physical Sidelink Broadcast Channel (PSBCH), sent by terminals within the network coverage, and perform sidelink communication.

[0061] Figure 3: For sideline communications outside the network coverage, all terminals performing sideline communications are located outside the network coverage, and all terminals determine the sideline configuration according to pre-configured information for sideline communications.

[0062] Figure 4: For sideline communication with a central control node, multiple terminals form a communication group. This communication group has a central control node, also known as the cluster header (CH). This central control node has one of the following functions: establishing the communication group; managing the joining and leaving of group members; coordinating resources, allocating sideline transmission resources to other terminals, receiving sideline feedback from other terminals, and coordinating resources with other communication groups.

[0063] D2D / V2X

[0064] Device-to-device (D2D) communication is a D2D-based sidelink (SL) transmission technology. Unlike traditional cellular systems, where data is received or sent via base stations, it offers higher spectrum efficiency and lower transmission latency. The connected vehicle system utilizes direct end-to-end communication, which, according to the 3rd Generation Partnership Project (3GPP), includes two transmission modes: Mode 1 and Mode 2.

[0065] Mode 1: The terminal's transmission resources are allocated by the base station, and the terminal transmits data on the sidelink based on the allocated resources. The base station can allocate resources for either single transmissions or semi-static transmissions. As shown in Figure 1, when the terminal is within network coverage, the network allocates transmission resources for sidelink transmissions.

[0066] Mode 2: The terminal selects a resource from the resource pool for data transmission. As shown in Figure 3, when the terminal is outside the cell coverage area, it autonomously selects a transmission resource from the pre-configured resource pool for sidelink transmission. Alternatively, as shown in Figure 1, the terminal autonomously selects a transmission resource from the network-configured resource pool for sidelink transmission.

[0067] NR-V2X:

[0068] In NR-V2X, autonomous driving needs to be supported, which places higher requirements on data interaction between vehicles, such as higher throughput, lower latency, higher reliability, larger coverage, and more flexible resource allocation.

[0069] In LTE-V2X, broadcast transmission is supported, and in NR-V2X, unicast and multicast transmission modes are introduced. For unicast transmission, there is only one receiving terminal. As shown in Figure 5, unicast transmission is performed between UE1 and UE2. For multicast transmission, the receiving end is all terminals in a communication group, or all terminals within a certain transmission distance. As shown in Figure 6, UE1, UE2, UE3 and UE4 constitute a communication group (Group), in which UE1 sends data, and other terminal devices in the group are all receiving terminals. For broadcast transmission, as shown in Figure 7, the receiving end is any terminal around the sending terminal. For example, UE1 is the sending terminal, and the other terminals around it, UE2-UE6, are all receiving terminals.

[0070] 2. 5G Unlicensed (Unlicensed) Spectrum Communications NR-U

[0071] The NR system introduced in the 3GPP R15 standard is a communication technology for use on existing and new licensed spectrum. The NR system can achieve seamless coverage, high spectrum efficiency, high peak rate and high reliability of cellular networks. In the long-term evolution technology system, unlicensed spectrum (or unlicensed spectrum) has been used as a supplementary frequency band for licensed spectrum in cellular networks. Similarly, the NR system can also use unlicensed spectrum as part of 5G cellular network technology to provide services to users. In the 3GPP R16 standard, the NR system for unlicensed spectrum is discussed, which is called NR unlicensed (NR-unlicensed, NR-U).

[0072] The NR-U system can support the following networking modes: licensed spectrum assisted access and unlicensed spectrum independent access. The former requires the use of licensed spectrum to access the network, and the unlicensed spectrum is used as a secondary carrier; the latter can be independently networked through the unlicensed spectrum, and the UE can directly access the network through the unlicensed spectrum. The range of unlicensed spectrum used by the NR-U system introduced in 3GPP R16 is concentrated in the 5GHz and 6GHz frequency bands, such as 5925-7125MHz in the United States, or 5925-6425MHz in Europe. In the R16 standard, band 46 (5150MHz-5925MHz) is also newly defined for use as an unlicensed spectrum.

[0073] Unlicensed spectrum is spectrum designated by countries and regions for use by radio equipment. This spectrum is generally considered shared spectrum, meaning that communications devices can use it as long as they meet national or regional regulatory requirements for the spectrum, without having to apply for exclusive spectrum authorization from the national or regional spectrum management agency. Because the use of unlicensed spectrum must comply with specific national and regional regulations, such as the "listen-before-talk" (LBT) principle, NR technology requires corresponding enhancements to meet regulatory requirements for unlicensed frequency bands while efficiently utilizing unlicensed spectrum to provide services. The 3GPP Release 16 standard primarily standardizes NR-U technology in the following areas: channel sensing process; initial access process; control channel design; HARQ and scheduling; and scheduling-free grant transmission. These technologies are described in detail below.

[0074] 1. Channel monitoring (LBT)

[0075] To ensure the harmonious coexistence of various communication systems using unlicensed spectrum for wireless communications, some countries and regions have established regulatory requirements for the use of unlicensed spectrum. For example, under European regulations, when communicating on unlicensed spectrum, communication devices must adhere to the "listen before talk" principle. This means that before transmitting signals on a channel in the unlicensed spectrum, they must first perform LBT, or channel sense. Only if the channel sense result indicates that the channel is idle, or if LBT is successful, can the communication device transmit signals on that channel. If the channel sense result indicates that the channel is busy, or if LBT fails, the communication device cannot transmit signals on that channel. Furthermore, to ensure fair use of shared spectrum resources, if a communication device successfully performs LBT on an unlicensed spectrum channel, the duration for which it can use that channel for communication cannot exceed a certain limit. This mechanism, by limiting the maximum duration of communication after a successful LBT, ensures that different communication devices have the opportunity to access the shared channel, thereby enabling harmonious coexistence of different communication systems on the shared spectrum.

[0076] Since channel monitoring can bring the benefits of interference avoidance and friendly coexistence to communication transmissions between communication systems on shared spectrum, channel monitoring is usually a feature that must be supported by communication equipment in the system during the design of NR systems on unlicensed spectrum. From the perspective of system networking, channel monitoring includes two mechanisms, one is LBT based on load-based equipment (LBE), also known as dynamic channel monitoring or dynamic channel occupancy, and the other is LBT based on frame-based equipment (FBE), also known as semi-static channel monitoring or semi-static channel occupancy. The following will introduce the LBT mechanism in the NR-U system and the channel monitoring of the base station and UE.

[0077] 2. Dynamic channel monitoring

[0078] Dynamic channel monitoring can also be considered as an LBT method based on LBE, and its channel monitoring principle is that the communication equipment performs LBT on the carrier of the unlicensed spectrum after the service arrives, and starts sending signals on the carrier after the LBT is successful. The LBT method of dynamic channel monitoring includes type 1 (Type1) channel access method and type 2 (Type2) channel access method. The Type1 channel access method is a multi-slot channel detection with random backoff based on the adjustment of the contention window size, wherein the corresponding channel access priority (Channel access priority class, CAPC) p can be selected according to the priority of the service to be transmitted. The Type2 channel access method is a channel access method based on a fixed-length monitoring time slot, wherein the Type2 channel access method includes Type2A channel access, Type2B channel access and Type2C channel access. The Type1 channel access method is mainly used for communication equipment to initiate channel occupancy, and the Type2 channel access method is mainly used for communication equipment to share channel occupancy. A special case that needs to be explained is that when the base station initiates channel occupation to transmit the synchronization signal / physical broadcast channel block (SS / PBCH block) within the DRS window and the DRS window does not include unicast data transmission of the UE, if the length of the DRS window does not exceed 1ms and the duty cycle of the DRS window transmission does not exceed 1 / 20, then the base station can use Type 2A channel access to initiate channel occupation. Figure 8 shows an example of the channel occupation time obtained by a communication device after successful LBT on a channel in unlicensed spectrum and the use of resources within the channel occupation time for signal transmission.

[0079] Default channel access mode on the base station side: Type 1 channel access

[0080] Taking the base station as an example, the channel access parameters corresponding to the channel access priority p on the base station side are shown in Table 1. In Table 1, m p Refers to the number of fallback slots corresponding to the channel access priority p, CW p Refers to the contention window (CW) size corresponding to the channel access priority p, CW min，p Refers to the CW corresponding to the channel access priority p p Minimum value, CW max，p Refers to the CW corresponding to the channel access priority p p The maximum value, T mcot，p It refers to the maximum channel occupancy time corresponding to the channel access priority p.

[0081] If the channel access process is completed, the base station can use the channel to transmit the service to be transmitted. The maximum time length that the base station can use the channel for transmission cannot exceed T mcot，p.

[0082] Table 1 Channel access parameters corresponding to different channel access priorities p

[0083] Channel occupancy time sharing on the base station side

[0084] When the base station initiates the Channel Occupancy Time (COT), in addition to using the resources within the COT for downlink transmission, the resources within the COT can also be shared with the UE for uplink transmission. When the resources within the COT are shared with the UE for uplink transmission, the channel access mode that the UE can use is Type 2A channel access, Type 2B channel access, or Type 2C channel access. Among them, Type 2A channel access, Type 2B channel access, and Type 2C channel access are all channel access modes based on fixed-length monitoring time slots.

[0085] Type 2A channel access: The UE uses a 25μs single-slot channel detection method. Specifically, under Type 2A channel access, the UE can monitor the channel for 25μs before starting transmission and transmit after the channel monitoring is successful.

[0086] Type 2B channel access: The UE uses a 16μs single-slot channel detection method. Specifically, under Type 2B channel access, the UE can monitor the channel for 16μs before starting transmission and transmit after the channel monitoring is successful. The gap between the start position of each transmission and the end position of the previous transmission is 16μs.

[0087] Type 2C channel access: The UE transmits after the gap ends without performing channel detection. Specifically, under Type 2C channel access, the UE can directly transmit, where the gap between the start position of the transmission and the end position of the previous transmission is less than or equal to 16μs. The transmission length does not exceed 584μs.

[0088] 3. Channel access for transmission(s) on multiple channels

[0089] When the system supports multiple channels (multiple RB sets), the UE needs to perform channel access on multiple channels separately, that is, LBT channel listening. When the NR-U DL multi-channel access mechanism is adopted, the UE can transmit on any channel where the channel access is successful. In the sideline unlicensed system, for the transmission of PSFCH and S-SSB, the following multi-channel access methods are supported:

[0090] Type A multi-channel access: When a UE wants to send PSFCH or S-SSB on C channels (RB sets), the UE needs to perform a Type 1 channel access procedure independently on each channel in C. If access is successful on any one or more of the channels, the UE can then send PSFCH or S-SSB on the corresponding channel or channels.

[0091] Type B multi-channel access: When a UE wants to transmit PSFCH or S-SSB on C channels (RB sets), it randomly selects one of the C channels and uses Type 1 channel access. The remaining channels use Type 2 channel access. Only after successful Type 1 channel access can the UE transmit on the channel where Type 2 channel access was successful. If Type 1 channel access fails, all channels accessed using Type 2 channels are considered unavailable.

[0092] 4. Channel access parameter indication (including CPE)

[0093] In the NR-U system, when the UE is scheduled to transmit the Physical Uplink Shared Channel (PUSCH) or the Physical Uplink Control Channel (PUCCH), the base station can indicate the channel access method corresponding to the PUSCH or PUCCH by carrying the downlink control information (DCI) of the uplink grant (UL grant) or downlink grant (DL grant). Since some channel access methods need to meet the gap requirements of 16μs or 25μs, the UE can ensure the gap size between the two transmissions by transmitting an extended cyclic prefix (CPE). Accordingly, the base station can indicate the CPE length of the first symbol of the UE's uplink transmission.

[0094] When specifically indicating, the base station can explicitly indicate channel access parameters such as CPE length, channel access mode or channel access priority to the UE through joint coding. The following describes the characteristics of the indication mode of channel access parameters introduced in different DCI formats.

[0095] 1. Fallback uplink grant for scheduling PUSCH transmission (DCI format 0_0):

[0096] The set of channel access methods and CPE length joint indications preset in the standard is shown in Table 2.

[0097] The fallback uplink grant includes 2-bit LBT indication information, and the 2-bit LBT indication information is used to indicate the joint coding channel access mode and CPE length from the set shown in Table 2.

[0098] The channel access mode and CPE length are used for PUSCH transmission.

[0099] If the channel access mode is Type 1 channel access, the UE selects the channel access priority class (CAPC) based on the service priority.

[0100] 2. Fallback downlink grant (DCI format 1_0) for scheduling Physical Downlink Shared Channel (PDSCH) transmission:

[0101] The set of channel access methods and CPE length joint indications preset in the standard is shown in Table 2 below.

[0102] The fallback downlink grant includes 2-bit LBT indication information, and the 2-bit LBT indication information is used to indicate the joint coding channel access mode and CPE length from the set shown in Table 2.

[0103] The channel access mode and CPE length are used for PUCCH transmission, where the PUCCH can carry ACK or NACK information corresponding to the PDSCH.

[0104] If the channel access mode is Type 1 channel access, the UE determines that the channel access priority CAPC for transmitting the PUCCH is 1.

[0105] Table 2 Channel access mode and CPE length joint indication set

[0106] In Table 2, the value of C1 is specified by the protocol. When the subcarrier spacing is 15 kHz and 30 kHz, C1 = 1; when the subcarrier spacing is 60 kHz, C1 = 2. The values ​​of C2 and C3 are configured by higher-layer parameters. When the subcarrier spacing is 15 kHz and 30 kHz, the values ​​of C2 and C3 range from 1 to 28; when the subcarrier spacing is 60 kHz, the values ​​of C2 and C3 range from 2 to 28.

[0107] 3. Non-fallback uplink grant for scheduling PUSCH transmission (DCI format 0_1):

[0108] The high layer configures an LBT parameter indication set, where the LBT parameter indication set includes at least one of a jointly coded channel access mode, a CPE length, and a CAPC.

[0109] The non-fallback uplink authorization includes LBT indication information, and the LBT indication information is used to indicate the joint coding channel access mode, CPE length and CAPC from the above-mentioned LBT parameter indication set.

[0110] The channel access mode, CPE length and CAPC are used for PUSCH transmission.

[0111] If the indicated channel access mode is Type 2 channel access, the CAPC indicated at the same time is the CAPC used by the base station when obtaining the COT.

[0112] The LBT indication information includes a maximum of 6 bits.

[0113] 4. Non-fallback downlink grant for scheduling PDSCH transmission (DCI format 1_1):

[0114] The high layer configures an LBT parameter indication set, where the LBT parameter indication set includes at least one jointly coded channel access mode and CPE length.

[0115] The non-fallback downlink authorization includes LBT indication information, and the LBT indication information is used to indicate the joint coding channel access mode and CPE length from the above-mentioned LBT parameter indication set.

[0116] The channel access mode and CPE length are used for PUCCH transmission, where the PUCCH can carry ACK or NACK information corresponding to the PDSCH.

[0117] If the channel access mode is Type 1 channel access, the UE determines that the channel access priority CAPC for transmitting the PUCCH is 1.

[0118] The LBT indication information includes a maximum of 4 bits.

[0119] In addition to the above explicit indications, the base station can also implicitly indicate the channel access method within the COT. When the UE receives an UL grant or DL ​​grant sent by the base station indicating that the channel access type corresponding to the PUSCH or PUCCH is Type 1 channel access, if the UE can determine that the PUSCH or PUCCH belongs to the COT of the base station, for example, the UE receives a DCI format 2_0 sent by the base station and determines that the PUSCH or PUCCH belongs to the COT of the base station based on the DCI format 2_0, then the UE can update the channel access type corresponding to the PUSCH or PUCCH to Type 2A channel access instead of Type 1 channel access.

[0120] Sidelink technology supports carrier aggregation in dedicated frequency bands (such as the Intelligent Traffic System (ITS) spectrum) or in licensed frequency bands, but does not support carrier aggregation between licensed and unlicensed frequency bands. In future technological evolution, carrier aggregation between licensed / dedicated spectrum and unlicensed spectrum is a major trend and is inevitable. However, this carrier aggregation approach has the following issues.

[0121] Since the unlicensed frequency band belongs to the shared frequency band, that is, users of different systems (for example, 3GPP sidelink, NR-U, IEEE WiFi) can compete for access to the channel through LBT, then each time the channel access process is performed, there may be an access failure. As shown in the three examples (cases) of Figure 9A, Figure 9B and Figure 9C, when a UE completes data segmentation or packaging, the physical layer maps it to different carrier components (CC) and prepares to send it. The resource selection and reservation on the licensed frequency band resources are based on the sideline sensing (SL sensing) results, and generally there will be no resource conflicts. On the other hand, on the unlicensed frequency band, LBT sensing is required before planning to send time slot resources. If the sensing result finds that the time slot resources are occupied, the UE will not be able to send in the corresponding time slot, which will cause the data packets to be sent to be unable to be sent, resulting in discontinuous data, that is, the function of carrier aggregation cannot be realized.

[0122] For example, as shown in Figure 9A , in Example 1 (Case 1), the UE transmits data in the same time slot on different CCs. If data transmission fails on the unlicensed band due to LBT failure, the data successfully transmitted on the licensed band may not be fully utilized at the receiving end, resulting in service discontinuity for the entire large data packet.

[0123] For example, as shown in Figure 9B and Figure 9C, in Case 2 / 3, the UE transmits in different time slots on different CCs. When the initial transmission and retransmission of the same transport block (TB) are transmitted, the failure of LBT may cause problems such as order disorder between the initial and retransmissions and resource waste.

[0124] FIG10A is a schematic flow chart of a sideline communication method 1000 according to an embodiment of the present application. The method can optionally be applied to the system shown in FIG1 , but is not limited thereto. The method includes at least part of the following contents.

[0125] S1010. The first communication device selects a transmission resource from sidelink multi-carrier resources according to the number of available carrier components.

[0126] In an embodiment of the present application, the sidelink multi-carrier resource may include multiple carrier components. The number of available carrier components on different time domain resources of the sidelink multi-carrier resource may be different. The number of available carrier components on different time domain resources may be less than or equal to the total number of carrier components in the sidelink multi-carrier resource. For example, the total number of carrier components in the sidelink multi-carrier resource is 6, the number of available carrier components in time slot 1 and time slot 2 is 6, the number of available carrier components in time slot 3 is 4, and the number of available carrier components in time slot 4 is 2. Time slots with a large number of available carrier components can be preferentially selected as transmission resources. In an embodiment of the present application, the performance of the communication system can be improved and the efficiency of resource utilization can be improved by selecting the transmission resources based on the number of available carrier components. For example, by preferentially selecting time slots containing more available carrier CCs as time slot resources for transmission, the waste of resources caused by the half-duplex problem can be greatly avoided.

[0127] In one embodiment, the sidelink multi-carrier resource includes carrier-aggregated time-frequency domain resources. For example, the sidelink multi-carrier resource includes m aggregated carrier components, each corresponding to a time slot from time slot 1 to time slot n. Where m is greater than or equal to 2, and n is greater than or equal to 2.

[0128] In one embodiment, the sidelink multi-carrier resource includes a licensed carrier component and an unlicensed carrier component. For example, the sidelink multi-carrier resource includes one licensed carrier component and one unlicensed carrier component. For another example, the sidelink multi-carrier resource includes multiple licensed carrier components and multiple unlicensed carrier components. For another example, the sidelink multi-carrier resource includes multiple licensed carrier components and one unlicensed carrier component.

[0129] In one embodiment, the sidelink multi-carrier resources include remaining resources after the first communication device excludes resources according to a channel monitoring result.

[0130] In one example, the resource selection method for NR-V2X listening is as follows:

[0131] In NR-V2X, in the second mode mentioned above, the terminal needs to select resources on its own.

[0132] As shown in Figure 10B, the terminal triggers resource selection or reselection in time slot n or time slot n is the time slot where the higher layer triggers the physical layer to report the candidate resource set. The resource selection window starts from n+T1 and ends at n+T2. 0<=T1<=T proc，1 , when the subcarrier spacing is 15, 30, 60, 120kHz, T proc，1 Time slots are 3, 5, 9, and 17. T2 min <=T2<=remaining delay budget of the service, T2 min The value set is {1, 5, 10, 20}*2μ time slots, where μ = 0, 1, 2, 3 corresponds to the case where the subcarrier spacing is 15, 30, 60, 120 kHz. The terminal determines T2 from the value set according to the priority of its own data to be sent. min For example, when the subcarrier spacing is 15kHz, the terminal determines T2 from the set {1, 5, 10, 20} according to the priority of its own data to be sent. min When T2 min If T2 is greater than or equal to the service's remaining delay budget, then T2 equals the service's remaining delay budget. The remaining delay budget is the difference between the time at which the data's delay requirement corresponds and the current time. For example, if a data packet arrives at time slot n and the delay requirement is 50 milliseconds, and a time slot is 1 millisecond, then if the current time is time slot n, the remaining delay budget is 50 milliseconds. If the current time is time slot n+20, the remaining delay budget is 30 milliseconds.

[0133] Terminals are at n-T0 to nT proc，0 Perform resource monitoring (excluding nT proc，0 ), T0 is 100 or 1100 milliseconds. When the subcarrier spacing is 15, 30, 60, or 120 kHz, T proc，0 The time slots are 1, 1, 2, and 4. Optionally, the terminal performs resource monitoring in the time slots of the resource pool used by it within the monitoring window. Optionally, the terminal monitors the first sideline control information sent by other terminals in each time slot (except its own transmission time slot). When the time slot n triggers resource selection or reselection, the terminal uses n-T0 to nT proc，0 The result of resource listening.

[0134] An example of the resource selection method may include the following steps:

[0135] Step 1: The terminal takes all available resources in the resource pool used by the terminal in the resource selection window as resource set A. Any resource in set A is denoted as R(x, y), where x and y indicate the frequency domain position and time domain position of the resource respectively. The initial number of resources in set A is denoted as M. total The terminal excludes resources from resource set A based on the un-listened time slots within the resource listening window (step 1-1) and / or the resource listening results within the resource listening window (step 1-2). The terminal determines whether resource R(x, y) or a series of periodic resources corresponding to resource R(x, y) overlaps with the time slot determined based on the un-listened time slots in step 1-1 or the resource determined based on the first sidelink control information detected in step 1-2. If so, resource R(x, y) is excluded from resource set A.

[0136] Step 1-1: If the terminal sends data in time slot m within the listening window and does not listen, the terminal will determine the corresponding Q time slots based on time slot m and each allowed resource reservation period in the resource pool used by the terminal, with the resource reservation period as the interval. If the Q time slots overlap with resource R(x, y) or a series of periodic resources corresponding to resource R(x, y), resource R(x, y) is excluded from resource set A. The above Q = 1 or (Represents rounding up). Tscal is equal to the value of T2 converted to milliseconds. Prx is one of the resource reservation periods allowed by the resource pool used by the terminal. Optionally, a series of periodic resources corresponding to the resource R(x, y) are Cresel resources with the same frequency domain position as R(x, y) and a fixed time interval in the time domain, where Cresel is related to the random count value generated by the terminal. For example, the time interval is determined according to the resource reservation period Ptx of the terminal. For example, in sub-figure 1 of Figure 10B, Cresel is 3, indicating 3 periodic resources (including R(x, y)) corresponding to the resource R(x, y).

[0137] For example, in subgraph 1 of Figure 10B , if the terminal does not listen in time slot m, resources are excluded according to each resource reservation period in the resource reservation period set M in the resource pool configuration. For a resource reservation period 1, assuming the calculated Q value is 2, the corresponding Q time slots are the two time slots marked with horizontal shading that follow the resource reservation period 1 mapped from time slot m in subgraph 1 of Figure 10B . For a resource reservation period 2, assuming the calculated Q value is Q=1, the corresponding Q time slots are the one time slot marked with dotted shading that follows the resource reservation period 2 mapped from time slot m in subgraph 1 of Figure 10B .

[0138] The terminal will determine whether the Q time slots corresponding to each reservation period overlap with the resource R(x, y) or a series of periodic resources corresponding to the resource R(x, y). If so, the resource R(x, y) will be excluded from the resource set A.

[0139] Optionally, when the resource pool used by the terminal deactivates the reservation between TBs, the terminal may not perform the above Step 1-1.

[0140] Optionally, after executing Step 1-1, if the remaining resources in resource set A are less than X*Mtotal, resource set A is initialized to all available resources belonging to the resource pool used by the terminal in the resource selection window and then executing Step 1-2.

[0141] Step 1-2: If the terminal detects the first sidelink control information transmitted in the Physical Sidelink Control Channel (PSCCH) in time slot m within the listening window, it measures the sidelink reference signal received power (SL-RSRP) of the PSCCH or the SL-RSRP of the PSSCH scheduled by the PSCCH (i.e., the SL-RSRP of the corresponding Physical Sidelink Shared Channel (PSSCH) sent in the same time slot as the PSCCH).

[0142] If the measured SL-RSRP is greater than the SL-RSRP threshold, and the sidelink control information (Sidelink Control Information, SCI) received by the UE contains a resource reservation period field, the terminal will determine the corresponding Q time slots based on the time slot m and the resource reservation period carried in the first sidelink control information detected, with the resource reservation period as the interval. The terminal assumes that the first sidelink control information with the same content is also received in the Q time slots. The terminal will determine whether the resources indicated by the time resource allocation ("Time resource assignment") and frequency resource allocation ("Frequency resource assignment") fields of the first sidelink control information received in time slot m and these assumed Q first sidelink control information are overlapped with the resource R (x, y) or a series of periodic resources corresponding to the resource R (x, y). If they overlap, the corresponding resource R (x, y) will be excluded from the set A. The above Q = 1 or (represents rounding up). Tscal is equal to the value of T2 converted to milliseconds. Prx is the resource reservation period carried in the first side control information detected. Optionally, a series of periodic resources corresponding to the resource R(x, y) are Cresel resources with the same frequency domain position as R(x, y) and a fixed time interval in the time domain, where Cresel is related to the random count value generated by the terminal. For example, the time interval is determined according to the resource reservation period Ptx of the terminal. For example, in sub-figure 2 of Figure 10B, Cresel is 3, indicating 3 periodic resources corresponding to the resource R(x, y) (including R(x, y)).

[0143] For example, in sub-figure 2 of Figure 10B , when the SCI received by the UE includes a resource reservation period field, if the terminal detects the first sidelink control information in the PSCCH on resource E(v, m) in time slot m, the resource reservation period in the first sidelink control information is Prx. Assuming the Q value is calculated to be 1, the terminal will assume that the same first sidelink control information is also received in the next time slot starting from time slot m and separated by Prx (i.e., the time slot where resource 4 is located). The terminal will determine whether the resources 1, 2, 3, 4, 5, and 6 indicated by the "Time resource assignment" and "Frequency resource assignment" fields of the first sidelink control information received in time slot m and the first sidelink control information assumed to be received overlap with resource R(x, y) or a series of periodic resources corresponding to resource R(x, y). If they overlap and the RSRP condition is met, resource R(x, y) is excluded from resource set A.

[0144] If the SL-RSRP measured by the terminal is greater than the SL-RSRP threshold and the SCI received by the terminal does not include the resource reservation period field, the terminal only determines whether the resources indicated by the "Time resource assignment" and "Frequency resource assignment" fields of the first sidelink control information received in time slot m overlap with the resource R(x, y) or a series of resources corresponding to the resource R(x, y). If they overlap, the resource R(x, y) is excluded from the resource set A.

[0145] For example, in sub-figure 2 of Figure 10B, when the SCI received by the terminal does not include the resource reservation period field, if the terminal detects the first sidelink control information in the PSCCH on the time slot m resource E(v, m), the terminal determines whether the resources 1, 2, 3 indicated by the "Time resource assignment" and "Frequency resource assignment" fields in the first sidelink control information overlap with the resource R(x, y) or a series of periodic resources corresponding to the resource R(x, y). If they overlap and the RSRP condition is met, the resource R(x, y) is excluded from the resource set A.

[0146] If the remaining resources in resource set A are less than M after the above resources are excluded total *X, the SL-RSRP threshold is raised by 3dB, and Step 1 is repeated. The physical layer reports the excluded resource set A as a candidate resource set to the upper layer.

[0147] Step 2: The upper layer randomly selects a resource from the reported candidate resource set to send data. That is, the terminal randomly selects a resource from the candidate resource set to send data.

[0148] Notice:

[0149] 1. The RSRP thresholds are determined by the priority level P1 carried in the PSCCH detected by the terminal and the priority level P2 of the data to be transmitted by the terminal. The terminal's resource pool configuration includes a SL-RSRP threshold table that contains the SL-RSRP thresholds for all priority combinations. The resource pool configuration can be network-configured or pre-configured.

[0150] When the terminal monitors the PSCCH sent by other UEs, it obtains the priority P1 and the priority P2 of the to-be-sent data carried in the first sidelink control information transmitted in the PSCCH, and determines the SL-RSRP threshold by looking up Table 1.

[0151] 2. Whether the terminal uses the measured PSCCH-RSRP or the PSSCH-RSRP scheduled by the PSCCH to compare with the SL-RSRP threshold depends on the resource pool configuration of the resource pool used by the terminal. The resource pool configuration can be network-configured or pre-configured.

[0152] 3. Possible values ​​for X and X are {20%, 35%, 50%}. The configuration of the resource pool used by the terminal includes a correspondence between priorities and the possible values. The terminal determines the value of X based on the priority of the data to be sent and this correspondence. The resource pool configuration can be configured by the network or pre-configured.

[0153] The above description describes a single-side link (SL) communication method in NR-V2X. This method involves terminals autonomously selecting transmission resources through resource sensing and independently transmitting data on the sidelink. This SL communication method can also be applied to various SL communications, such as direct communication between handheld terminals and between pedestrians and vehicles.

[0154] In the embodiment of the present application, channel monitoring may also be referred to as channel sounding. Through side channel monitoring, resources that cannot be used by the first communication device, such as a terminal, may be eliminated, and the remaining resources obtained are resources that may be used by the first communication device.

[0155] In one embodiment, the resources to be excluded during resource exclusion include at least one of the following:

[0156] Resources not monitored, resources found to be occupied after monitoring the Physical Sidelink Control Channel (PSCCH), resources found to be reserved after monitoring the PSCCH, resources that cannot be transmitted due to half-duplex operation, and resources used to send synchronization signals. For example, resources not monitored by the terminal may include: during the sidelink channel monitoring process, only time slots 1 to 5 are monitored, and time slots 6 and 7 are not monitored. In this case, time slots 6 and 7 can be excluded. For another example, if the terminal finds that time slots 2 to 3 are occupied after monitoring the PSCCH, time slots 2 and 3 can be excluded. For another example, if the terminal finds that time slot 4 is reserved after monitoring the PSCCH, time slot 4 can be excluded. For another example, if time slot 11 is half-duplex, time slot 11 can be excluded. For another example, if time slot 12 is used to send synchronization signals, time slot 12 can be excluded.

[0157] Figure 11 is a schematic flow chart of a sideline communication method 1100 according to another embodiment of the present application. The method may include one or more features of the above-mentioned method. In one embodiment, the transmission resource includes the first time slot with the largest number of available carrier components. For example, the sideline multi-carrier resource includes 3 carrier components, the number of available carrier components on time slot 1, time slot 3, and time slot 4 is 3, the number of available carrier components on time slot 2, time slot 5, and time slot 6 is 2, and the number of available carrier components on time slot 7 is 1. The time slot with the largest number of available carrier components can be preferentially selected as the transmission resource. For example, time slot 3 can be selected first as the transmission resource for a certain information. Subsequently, time slot 1, time slot 4, etc. can be selected as the transmission resource. If the time slot with 3 available carrier components is used up, time slot 2, time slot 5, or time slot 6 with 2 available carrier components can continue to be selected as the transmission resource.

[0158] In one embodiment, the method further comprises:

[0159] S1110. The first communication device performs channel access on the unlicensed carrier component on the first timeslot;

[0160] S1120: The first communication device determines whether to send information in the first time slot according to the channel access result.

[0161] In an embodiment of the present application, a first communication device, such as a terminal, can perform LBT on one or more unlicensed carrier components on the first time slot, that is, perform channel access. The channel access results may include multiple types: LBT success on one or more unlicensed carrier components, and LBT failure on one or more unlicensed carrier components. For example, there are 5 available carrier components on the first time slot, including 4 unlicensed carrier components. The channel access results of these 4 unlicensed carrier components may include all LBT successes, 1 unlicensed carrier component success, 2 unlicensed carrier components successes, and 3 unlicensed carrier components successes. Determining whether to send information on the first time slot based on the channel access results of the unlicensed carrier components on the first time slot can improve the success rate of information transmission.

[0162] In one embodiment, the first communications device determines whether to send information in the first time slot based on the channel access result, including at least one of the following:

[0163] Case 1: When channel access is successful for all unlicensed component carriers in the first time slot, information is sent on the licensed component carrier in the first time slot and all unlicensed component carriers.

[0164] For example, the available carrier components on the first time slot include n unlicensed carrier components, and the terminal successfully performs LBT on all n unlicensed carrier components. Then, information can be sent on the licensed carrier component and n unlicensed carrier components on the first time slot.

[0165] Case 2: When access to one or more unlicensed carrier component channels in the first time slot fails, no information is sent in the first time slot.

[0166] For example, if the available carrier components on the first time slot include n unlicensed carrier components, and the terminal succeeds in LBT on two of the unlicensed carrier components but fails on the other unlicensed carrier components, then the terminal may not send information on the first time slot.

[0167] Case 3: When channel access to one or more unlicensed component carriers in the first time slot is successful, information is sent on the licensed component carriers in the first time slot and the unlicensed component carriers for which channel access is successful.

[0168] For example, the available carrier components on the first time slot include n unlicensed carrier components, and the terminal succeeds in LBT on two of the unlicensed carrier components. Then, information can be sent on the licensed carrier component on the first time slot and the two unlicensed carrier components on which LBT succeeds.

[0169] Case 4: When channel access fails for all unlicensed component carriers in the first time slot, information is sent on the licensed component carrier in the first time slot.

[0170] For example, the available carrier components in the first time slot include n unlicensed carrier components, and if the terminal fails LBT on all the n unlicensed carrier components, the terminal may send information on the licensed carrier component in the first time slot.

[0171] FIG12 is a schematic flow chart of a sideline communication method 1200 according to another embodiment of the present application. The method may include one or more features of the above method. In one embodiment, the method further includes:

[0172] S1210: When the first communication device fails to access a channel on an unlicensed component carrier multiple times in a row, trigger resource reselection.

[0173] In an embodiment of the present application, if a first communication device, such as a terminal, fails to access a channel on an unlicensed component carrier of a sidelink multi-carrier resource multiple times in a row, resource reselection may be triggered. For example, S1010 may be re-executed to select a transmission resource from the sidelink multi-carrier resource based on the number of available component carriers. After resource reselection, the success rate of subsequent information transmission may be improved.

[0174] In one embodiment, multiple consecutive channel access failures include: channel access failures occurring in multiple consecutive time slots, or the same data packet being unable to be sent due to multiple consecutive channel access failures.

[0175] For example, on unlicensed component carrier CC1, LBT fails for three consecutive time slots. Another example is that on unlicensed component carrier CC2, packet P1 cannot be sent due to LBT failures for four consecutive time slots. Within a group of aggregated carriers, the failure thresholds for triggering resource reselection can be the same or different for different component carriers.

[0176] In one embodiment, the resource reselection includes:

[0177] Perform resource reselection on the current unlicensed carrier component; or

[0178] Resource reselection is performed on other unlicensed carrier components other than the current unlicensed carrier component.

[0179] For example, after LBT fails for three consecutive time slots: time slot 1, time slot 2, and time slot 3 on the unlicensed carrier component CC1, resource reselection can be triggered on CC1, and time slot 5 can be reselected as the transmission resource.

[0180] For another example, after LBT fails for four consecutive time slots: time slot 2, time slot 3, time slot 4 and time slot 5 on the unlicensed carrier component CC2, resource reselection can be triggered on CC3, and time slot 5 on CC3 can be reselected as the transmission resource.

[0181] The sidelink communication method provided in the embodiment of the present application includes a method for selecting and transmitting sidelink multi-carrier (licensed carrier and unlicensed carrier) resources, which mainly includes the following contents:

[0182] In the case of multi-carrier sidelinks, time slots containing more available carrier component resources are preferentially selected as transmission resources;

[0183] When transmitting simultaneously on multiple unlicensed carrier components and licensed carriers, whether to transmit in the current timeslot is determined based on the channel access result on the unlicensed carrier;

[0184] Continuous timeslots or multiple transmissions of the same data packet on an unlicensed carrier cannot be sent due to channel access failure, triggering resource reselection on the current carrier, or carrier switching and resource reselection.

[0185] For example, a method for selecting and transmitting sidelink multi-carrier resources may mainly include the following:

[0186] 1. The UE independently performs sidelink sensing on K component carriers (CCs) and selects resources based on the sensing results.

[0187] 1. The UE excludes resources based on the channel monitoring results. The excluded resources include but are not limited to:

[0188] Exclude resources that are not monitored, resources that are occupied / reserved after monitoring PSCCH, and resources that cannot be sent due to half-duplex;

[0189] Excluding resources used for sending synchronization signals;

[0190] 2. After resource exclusion is completed on the K component carriers CC, resource selection is performed among the remaining resources.

[0191] If a time slot S has available resources on K1 (K1≤K) carrier CCs, the UE preferentially selects the time slot S and the available resources on the K1 carrier CCs.

[0192] 3. After the UE selects time slot S and the resources corresponding to K1 carrier CCs, where K2 (K2 ≤ K1) carrier CCs are carriers in the unlicensed band, before transmitting in time slot S, it is necessary to perform channel access (LBT channel sensing) before transmitting in the time slots corresponding to these K2 carrier CCs. The UE decides whether to transmit in time slot S based on the channel access result, including at least one of the following methods:

[0193] Method 1: When the UE successfully accesses the channel on each of the K2 carrier CCs, the UE transmits on the K1 carrier CCs in time slot S. When the UE fails to access the channel on at least one of the K2 carrier CCs, the UE does not transmit any information in time slot S.

[0194] Method 2: When the UE successfully accesses at least one of the K2 carrier CCs, the UE transmits on the carrier CC corresponding to the time slot S where the channel access was successful and on the CC of the authorized frequency band. If the UE fails to access all of the K2 carrier CCs, the UE transmits on the CC of the authorized frequency band corresponding to the time slot S.

[0195] 2. When the UE fails to send M consecutive TBs due to channel access (LBT) failures on the first unlicensed carrier CC, the UE needs to trigger resource reselection, where M≥1.

[0196] 1. After completing resource selection and waiting to transmit on an unlicensed carrier (CC), the UE needs to perform a channel access (LBT channel sensing) process before transmitting the timeslot.

[0197] 2. Trigger resource reselection:

[0198] When a UE fails to access a channel on an unlicensed carrier (CC) for M consecutive times, this event / result triggers resource reselection on the current unlicensed carrier (CC).

[0199] 3. Trigger carrier reselection

[0200] When a UE fails to access a channel on an unlicensed carrier CC for M consecutive times and cannot successfully access the channel, this event / result triggers the UE to select another carrier CC other than the current unlicensed carrier CC and perform resource selection / reselection on the other carrier CC.

[0201] Here are a few specific examples.

[0202] Example 1:

[0203] As shown in Figure 13, after the resource exclusion process, the UE forms an available resource set C with the remaining resources.

[0204] In available resource set C, time slots with available resources in all three CCs have the highest priority in resource selection. For example, the two time slots within the dashed box in Figure 13 have available resources in three (contiguous) CCs. When selecting resources, the UE prioritizes resources in one, two, or three CCs corresponding to these two time slots (to minimize half-duplex issues and prevent interference from other UEs).

[0205] In available resource set C, time slots with available resources in the same time slot corresponding to two CCs have the second highest priority in resource selection. For example, the three time slots within the dashed circle in Figure 13 have available resources in two (contiguous) CCs. When selecting resources, the UE can select resources in one or both CCs in these time slots if no higher-priority resources are available.

[0206] Example 2

[0207] As shown in Figure 14, the UE has selected three CCs for time slot n and is about to transmit. Before transmitting on the unlicensed CC corresponding to time slot n, a channel access (LBT channel sensing) process is required. The UE performs LBT on unlicensed CC1, but the channel sensing results show that CC1 is occupied by another UE from a different system in time slot n. Therefore, the UE fails to access the channel on unlicensed CC1. The UE successfully accesses the channel on unlicensed CC2. The UE does not transmit any information in time slot n.

[0208] Example 3

[0209] As shown in Figure 15, the UE has selected three CCs for time slot n and is about to transmit. Before transmitting on the unlicensed CC corresponding to time slot n, a channel access (LBT channel sensing) process is required. The UE performs LBT on unlicensed CC1 and CC2, and channel access is successful. The UE then transmits normally on time slot n.

[0210] Example 4

[0211] As shown in Figure 16, the UE has selected three CCs for time slot n and is about to transmit. Before transmitting on the unlicensed CC corresponding to time slot n, a channel access (LBT channel sensing) process is required. The UE performs LBT on unlicensed CC1, but the channel sensing result shows that CC1 is occupied by another UE from another system in time slot n. Therefore, the UE fails to access the channel on unlicensed CC1; the UE successfully accesses the channel on unlicensed CC2. The UE transmits on time slot n on the licensed CC and CC2 where channel access is successful, and does not transmit on CC2 where channel access failed.

[0212] Example 5

[0213] As shown in Figure 17, the UE must perform a channel access procedure (LBT channel sensing) before transmitting on an unlicensed CC. If the UE fails to access the channel for four consecutive time slots on CC1, it will trigger resource reselection on CC1. If the UE fails to access the channel for three consecutive time slots on CC2, it will trigger resource selection on CC2. In the above case, channel access fails for R consecutive time slots. Each CC is independently configured, and R can be the same or different.

[0214] Example 6

[0215] As shown in Figure 18, the UE needs to perform a channel access process (LBT channel listening) before transmitting on an unlicensed CC. If the UE fails to access the channel for three consecutive time slots on unlicensed CC2, it will trigger the UE to switch CCs. This means that the UE needs to select resources on a CC other than CC2, such as switching to unlicensed CC1 or selecting resources on a licensed CC.

[0216] Example 7

[0217] As shown in Figure 19, the UE needs to perform a channel access process (LBT channel listening) before transmitting on an unlicensed CC. If the UE fails to access the transmission channel three times while transmitting the same TB on unlicensed CC2, the UE is triggered to switch CCs. This means that the UE needs to select resources on a CC other than CC2, such as switching to unlicensed CC1 or a licensed CC for resource selection.

[0218] In a sidelink multi-carrier transmission method according to an embodiment of the present application, during resource selection, the UE prioritizes time slots containing a large number of available carriers (CCs) as transmission time slot resources. This significantly avoids resource waste caused by issues such as half-duplex. Furthermore, it minimizes transmission interference between different UEs, thereby improving system performance and resource utilization efficiency.

[0219] FIG20 is a schematic block diagram of a first communication device 2000 according to an embodiment of the present application. The first communication device 2000 may include:

[0220] The first processing unit 2001 is configured to select a transmission resource from sidelink multi-carrier resources according to the number of available carrier components.

[0221] In one embodiment, the sidelink multi-carrier resources include carrier aggregated time-frequency domain resources.

[0222] In one embodiment, the sidelink multi-carrier resources include a licensed carrier component and an unlicensed carrier component.

[0223] In one embodiment, the sidelink multi-carrier resources include remaining resources after the first communication device excludes resources according to a channel monitoring result.

[0224] In one embodiment, the resources to be excluded during resource exclusion include at least one of the following:

[0225] Resources that are not monitored, resources that are known to be occupied after monitoring PSCCH, resources that are known to be reserved after monitoring PSCCH, resources that cannot be sent due to half-duplex, and resources used to send synchronization signals.

[0226] In one embodiment, the transmission resource includes a first time slot having the largest number of available carrier components.

[0227] In one embodiment, the first communication device further includes:

[0228] A second processing unit 2002 is configured to perform channel access on the unlicensed carrier component in the first time slot;

[0229] The determining unit 2003 is configured to determine whether to send information in the first time slot according to the channel access result.

[0230] In one embodiment, the first communication device determines whether to send information in the first time slot according to the channel access result, including at least one of the following:

[0231] When all unlicensed carrier components on the first time slot have successfully accessed channels, sending information on the licensed carrier component and all unlicensed carrier components on the first time slot;

[0232] If access to one or more unlicensed carrier component channels on the first time slot fails, not sending information on the first time slot;

[0233] When channel access to one or more unlicensed carrier components on the first time slot is successful, sending information on the licensed carrier component on the first time slot and the unlicensed carrier component on which channel access has been successful;

[0234] In a case where channel access fails for all unlicensed component carriers on the first time slot, information is sent on the licensed component carrier on the first time slot.

[0235] In one embodiment, the first processing unit is further configured to trigger resource reselection when channel access fails multiple times consecutively on an unlicensed component carrier.

[0236] In one embodiment, multiple consecutive channel access failures include: channel access failures occurring in multiple consecutive time slots, or the same data packet being unable to be sent due to multiple consecutive channel access failures.

[0237] In one embodiment, the resource reselection includes:

[0238] Perform resource reselection on the current unlicensed carrier component; or

[0239] Resource reselection is performed on other unlicensed carrier components other than the current unlicensed carrier component.

[0240] The first communication device 2000 of the embodiment of the present application can implement the corresponding functions of the first communication device in the aforementioned method embodiment. The processes, functions, implementation methods and beneficial effects corresponding to the various modules (sub-modules, units or components, etc.) in the first communication device 2000 can be found in the corresponding descriptions in the above-mentioned method embodiments, and will not be repeated here. It should be noted that the functions described in the various modules (sub-modules, units or components, etc.) in the first communication device 2000 of the application embodiment can be implemented by different modules (sub-modules, units or components, etc.) or by the same module (sub-module, unit or component, etc.).

[0241] Figure 21 is a schematic structural diagram of a communication device 2100 according to an embodiment of the present application. The communication device 2100 includes a processor 2110, which can call and execute a computer program from a memory to enable the communication device 2100 to implement the method in the embodiment of the present application.

[0242] In one embodiment, the communication device 2100 may further include a memory 2120. The processor 2110 may call and execute a computer program from the memory 2120 to enable the communication device 2100 to implement the method in the embodiment of the present application.

[0243] The memory 2120 may be a separate device independent of the processor 2110 , or may be integrated into the processor 2110 .

[0244] In one embodiment, the communication device 2100 may further include a transceiver 2130 , and the processor 2110 may control the transceiver 2130 to communicate with other devices. Specifically, the transceiver 2130 may send information or data to other devices, or receive information or data sent by other devices.

[0245] The transceiver 2130 may include a transmitter and a receiver. The transceiver 2130 may further include an antenna, and the number of antennas may be one or more.

[0246] In one embodiment, the communication device 2100 may be the first communication device of the embodiment of the present application, and the communication device 2100 may implement the corresponding processes implemented by the first communication device in each method of the embodiment of the present application. For the sake of brevity, they will not be repeated here.

[0247] 22 is a schematic structural diagram of a chip 2200 according to an embodiment of the present application. The chip 2200 includes a processor 2210, which can call and execute a computer program from a memory to implement the method according to the embodiment of the present application.

[0248] In one embodiment, the chip 2200 may further include a memory 2220. The processor 2210 may call and execute a computer program from the memory 2220 to implement the method executed by the communication device in the embodiment of the present application.

[0249] The memory 2220 may be a separate device independent of the processor 2210 , or may be integrated into the processor 2210 .

[0250] In one embodiment, the chip 2200 may further include an input interface 2230. The processor 2210 may control the input interface 2230 to communicate with other devices or chips, and specifically, may obtain information or data sent by other devices or chips.

[0251] In one embodiment, the chip 2200 may further include an output interface 2240. The processor 2210 may control the output interface 2240 to communicate with other devices or chips, and specifically, may output information or data to other devices or chips.

[0252] In one embodiment, the chip can be applied to the communication device in the embodiment of the present application, and the chip can implement the corresponding processes implemented by the communication device in each method of the embodiment of the present application. For the sake of brevity, it will not be repeated here.

[0253] The chips used in the communication device may be the same chip or different chips.

[0254] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0255] The processor mentioned above may be a general-purpose processor, a digital signal processor (DSP), a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), or other programmable logic devices, transistor logic devices, discrete hardware components, etc. The general-purpose processor mentioned above may be a microprocessor or any conventional processor, etc.

[0256] The memory mentioned above may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. The non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM).

[0257] It should be understood that the above-mentioned memories are exemplary but not restrictive. For example, the memories in the embodiments of the present application may also be static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct RAM RAM (DR RAM), etc. In other words, the memories in the embodiments of the present application are intended to include, but are not limited to, these and any other suitable types of memories.

[0258] FIG23 is a schematic block diagram of a communication system 2300 according to an embodiment of the present application. The communication system 2300 includes a first communication device 2310 .

[0259] The first communication device 2310 selects transmission resources from the sidelink multi-carrier resources according to the number of available carrier components.

[0260] In one embodiment, the communication system 2300 further includes a second communication device 2320 configured to receive information from the first communication device.

[0261] In one embodiment, the first communication device and the second communication device may be terminal devices of a sideline communication link, and may be used to implement the corresponding functions implemented by the terminal devices in the above method.

[0262] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When software is used for implementation, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function in accordance with the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website, computer, server or data center by wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) mode to another website, computer, server or data center. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrations. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (eg, a solid state disk (SSD)).

[0263] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0264] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0265] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included within the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A sidelink communication method, comprising: A first communication device selects a transmission resource from sidelink multi-carrier resources according to the number of available carrier components.

2. The method according to claim 1, wherein The sidelink multi-carrier resources include time-frequency domain resources of carrier aggregation.

3. The method according to claim 1 or 2, wherein The sidelink multi-carrier resources include authorized carrier components and unauthorized carrier components.

4. The method according to any one of claims 1 to 3, wherein, The sidelink multi-carrier resources include the remaining resources after the first communication device excludes resources according to the channel monitoring result.

5. The method according to claim 4, wherein, The resources that need to be excluded for resource exclusion include at least one of the following: Resources that are not monitored, resources that are known to be occupied after monitoring the PSCCH, resources that are known to be reserved after monitoring the PSCCH, resources that cannot be transmitted due to half-duplex, and resources for transmitting synchronization signals.

6. The method according to any one of claims 1 to 5, wherein The transmission resource includes the first time slot with the largest number of available carrier components.

7. The method according to claim 6, wherein, The method further comprises: The first communication device performs channel access on the unauthorized carrier components in the first time slot; The first communication device determines whether to transmit information in the first time slot according to the channel access result.

8. The method according to claim 7, wherein The first communication device determines whether to transmit information in the first time slot according to the channel access result, including at least one of the following: When all unauthorized carrier components in the first time slot succeed in channel access, transmit information on the authorized carrier components and all unauthorized carrier components in the first time slot; When one or more unauthorized carrier components in the first time slot fail in channel access, do not transmit information in the first time slot; When one or more unauthorized carrier components in the first time slot succeed in channel access, transmit information on the authorized carrier components and the unauthorized carrier components that succeed in channel access in the first time slot; When all unauthorized carrier components in the first time slot fail in channel access, transmit information on the authorized carrier components in the first time slot.

9. The method according to any one of claims 1 to 8, wherein, The method further comprises: When the first communication device fails in channel access continuously for multiple times on one unauthorized carrier component, trigger resource reselection.

10. The method according to claim 9, wherein, Failing in channel access continuously for multiple times includes: failing in channel access for consecutive multiple time slots, or the same data packet fails to be transmitted continuously for multiple times due to channel access failure.

11. The method according to claim 1, wherein, The resource reselection includes: Performing resource reselection on the current unauthorized carrier component; or Performing resource reselection on other unauthorized carrier components outside the current unauthorized carrier component.

12. A first communication device, comprising: A first processing unit for selecting a transmission resource from sidelink multi-carrier resources according to the number of available carrier components.

13. The first communication device according to claim 12, wherein, The sidelink multi-carrier resources include time-frequency domain resources of carrier aggregation.

14. The first communication device according to claim 12 or 13, wherein, The sidelink multi-carrier resources include authorized carrier components and unauthorized carrier components.

15. The first communication device according to any one of claims 12 to 14, wherein, The sidelink multi-carrier resources include the remaining resources after the first communication device excludes resources according to the channel monitoring result.

16. The first communication device according to claim 15, wherein, The resources that need to be excluded for resource exclusion include at least one of the following: Resources that are not monitored, resources that are known to be occupied after monitoring the PSCCH, resources that are known to be reserved after monitoring the PSCCH, resources that cannot be transmitted due to half-duplex, and resources for transmitting synchronization signals.

17. The first communication device according to any one of claims 12 to 16, wherein, The transmission resource includes a first time slot with the largest number of available carrier components.

18. The first communication device according to claim 17, wherein, The first communication device further includes: A second processing unit for performing channel access on unauthorized carrier components on the first time slot; A determination unit for determining whether to send information on the first time slot according to the channel access result.

19. The first communication device according to claim 18, wherein, The first communication device determines whether to send information on the first time slot according to the channel access result, including at least one of the following: When channel access is successful for all unauthorized carrier components on the first time slot, send information on the authorized carrier components and all unauthorized carrier components on the first time slot; When channel access fails for one or more unauthorized carrier components on the first time slot, do not send information on the first time slot; When channel access is successful for one or more unauthorized carrier components on the first time slot, send information on the authorized carrier components and the unauthorized carrier components for which channel access is successful on the first time slot; When channel access fails for all unauthorized carrier components on the first time slot, send information on the authorized carrier components on the first time slot.

20. The first communication device according to any one of claims 12 to 19, wherein, The processing unit is further configured to trigger resource reselection when channel access fails continuously multiple times on one unauthorized carrier component.

21. The first communication device according to claim 20, wherein, Continuous multiple channel access failures include: channel access failures occurring in consecutive multiple time slots, or the same data packet being unable to be sent continuously multiple times due to channel access failures.

22. The first communication device according to claim 12, wherein, The resource reselection includes: Performing resource reselection on the current unauthorized carrier component; or Performing resource reselection on other unauthorized carrier components other than the current unauthorized carrier component.

23. A first communication device, comprising: A transceiver, a processor, and a memory, where the memory is used to store a computer program, the transceiver is used to communicate with other devices, and the processor is used to call and run the computer program stored in the memory, so that the first communication device executes the method according to any one of claims 1 to 11.

24. A chip, comprising: A processor for calling and running a computer program from a memory, so that a device installed with the chip executes the method according to any one of claims 1 to 11.

25. A computer-readable storage medium for storing a computer program, which, when run by a device, causes the device to execute the method according to any one of claims 1 to 11.

26. A computer program product including computer program instructions, which cause a computer to execute the method according to any one of claims 1 to 11.

27. A computer program, which causes a computer to execute the method according to any one of claims 1 to 11.

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