Communication method and terminal device

Abstract

A communication method and a terminal device are provided. The communication method includes a step of a first terminal device transmitting a first sidelink channel to a second terminal device via a first sidelink, where the first sidelink channel includes first COT sharing information, and the first COT sharing information satisfies one or more of the following: namely, the first COT sharing information is carried in a first PSSCH of the first sidelink channel; the first COT sharing information includes second COT sharing information and third COT sharing information, the second COT sharing information corresponds to a first communication mode, and the third COT sharing information corresponds to a second communication mode.

Description

Technical Field

[0001] This application relates to the technical field of communications, and more particularly, to communication methods and terminal devices.

Background Art

[0002] In unlicensed spectrum, a sidelink terminal device acquires channel resources through mechanisms such as Listen Before Talk (LBT). The terminal device can use the channel resources to perform sidelink communication within the Channel Occupancy Time (COT).

[0003] The resources within the COT can also be shared with other terminal devices. How to implement COT sharing is an urgent issue to be solved.

Summary of the Invention

Means for Solving the Problems

[0004] This application provides a communication method and a terminal device. Various aspects of the embodiments of this application are described below.

[0005] According to a first aspect, a communication method is provided. The method includes steps of a first terminal device transmitting a first sidelink channel to a second terminal device via a first sidelink. The first sidelink channel includes first COT sharing information, and the first COT sharing information satisfies one or more of the following: the first COT sharing information is carried in a first Physical Sidelink Shared Channel (PSSCH) of the first sidelink channel; the first COT sharing information includes second COT sharing information and third COT sharing information, the second COT sharing information corresponds to a first communication mode, and the third COT sharing information corresponds to a second communication mode.

[0006] According to a second aspect, a communication method is provided. The method includes a step of receiving, by a second terminal device, a first sidelink channel transmitted by a first terminal device via a first sidelink. The first sidelink channel includes first COT sharing information, and the first COT sharing information satisfies one or more of the following: the first COT sharing information is carried in a first PSSCH of the first sidelink channel; the first COT sharing information includes second COT sharing information and third COT sharing information, the second COT sharing information corresponds to a first communication mode, and the third COT sharing information corresponds to a second communication mode.

[0007] According to a third aspect, a communication method is provided. The method includes a step of transmitting, by a first terminal device, a first sidelink channel. The first sidelink channel includes first COT sharing information, and the first COT sharing information is used to indicate that the first terminal device has allocated a first resource within a COT to a second terminal device. The first resource is determined based on one or more of the following information: whether the second terminal device is a terminal device within a communication cluster where the first terminal device is located, and a priority corresponding to the second terminal device.

[0008] According to a fourth aspect, a communication method is provided. The method includes a step of receiving, by a second terminal device, a first sidelink channel. The first sidelink channel includes first COT sharing information, and the first COT sharing information is used to indicate that the first terminal device has allocated a first resource within a COT to a second terminal device. The first resource is determined based on one or more of the following information: whether the second terminal device is a terminal device within a communication cluster where the first terminal device is located, and a priority corresponding to the second terminal device.

[0009] According to a fifth aspect, a terminal device is provided. The terminal device is a first terminal device and includes a communication module configured to transmit a first sidelink channel to a second terminal device via a first sidelink. The first sidelink channel includes first COT sharing information, and the first COT sharing information satisfies one or more of the following: namely, the first COT sharing information is carried in a first PSSCH of the first sidelink channel; the first COT sharing information includes second COT sharing information and third COT sharing information, the second COT sharing information corresponds to a first communication mode, and the third COT sharing information corresponds to a second communication mode.

[0010] According to a sixth aspect, a terminal device is provided. The terminal device is a second terminal device and includes a communication module configured to receive, via a first sidelink, a first sidelink channel transmitted by a first terminal device. The first sidelink channel includes first COT sharing information, and the first COT sharing information satisfies one or more of the following: namely, the first COT sharing information is carried in a first PSSCH of the first sidelink channel; the first COT sharing information includes second COT sharing information and third COT sharing information, the second COT sharing information corresponds to a first communication mode, and the third COT sharing information corresponds to a second communication mode.

[0011] According to a seventh aspect, a terminal device is provided. The terminal device is a first terminal device and includes a communication module configured to transmit a first sidelink channel. The first sidelink channel includes first COT sharing information, and the first COT sharing information is used to indicate that the first terminal device has allocated a first resource within a COT to a second terminal device. The first resource is determined based on one or more of the following information: namely, whether the second terminal device is a terminal device within a communication cluster where the first terminal device is located, and the priority corresponding to the second terminal device.

[0012] According to an eighth aspect, a terminal device is provided. The terminal device is a second terminal device and includes a communication module configured to receive a first sidelink channel. The first sidelink channel includes first COT sharing information. The first COT sharing information is used to indicate that a first terminal device has allocated a first resource within a COT to a second terminal device. The first resource is determined based on one or more of the following information: whether the second terminal device is a terminal device within a communication cluster where the first terminal device is located, and a priority corresponding to the second terminal device.

[0013] According to a ninth aspect, a communication device is provided. The communication device includes a memory and a processor. The memory is configured to store a program. The processor is configured to call the program in the memory to implement a method according to any one of the first to fourth aspects.

[0014] According to a tenth aspect, a device is provided. The device includes a processor configured to call a program from a memory to implement a method according to any one of the first to fourth aspects.

[0015] According to an eleventh aspect, a chip is provided. The chip includes a processor configured to call a program from a memory to cause a device in which the chip is installed to implement a method according to any one of the first to fourth aspects.

[0016] According to a twelfth aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores a program for causing a computer to implement a method according to any one of the first to fourth aspects.

[0017] According to a thirteenth aspect, a computer program product is provided. The computer program product includes a program for causing a computer to implement a method according to any one of the first to fourth aspects.

[0018] According to the 14th aspect, a computer program is provided, and the computer program causes a computer to execute a method according to any one of the 1st aspect to the 4th aspect.

[0019] In the embodiments of the present application, when the first terminal device performs sidelink communication with the second terminal device, the COT sharing information is carried on the sidelink channel. The method for sharing the COT sharing information proposed in the embodiments of the present application helps to improve the utilization rate of sidelink channel resources.

Brief Description of the Drawings

[0020]

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Mode for Carrying Out the Invention

[0021] The technical solution of the embodiment of the present application will be clearly and completely described below together with the accompanying drawings. Of course, the described embodiments are only some, not all, of the embodiments of the present application. For ease of understanding, the terms and communication processes related to the present application will be first described below with reference to FIGS. 1 to 5.

[0022] FIG. 1 is an exemplary diagram of the system architecture of a wireless communication system 100 to which the embodiment of the present application is applicable. The wireless communication system 100 may include a network device 110 and terminal devices 121 to 129. The network device 110 can provide communication coverage in a specific geographical area and communicate with terminals within the coverage area.

[0023] In some implementation forms, the terminal devices may communicate with each other through sidelink (SL). Sidelink communication may also be referred to as proximity service (ProSe) communication, one-way communication, side link communication, device-to-device (D2D) communication, etc.

[0024] In other words, sidelink data is transmitted between terminal devices via the sidelink. The sidelink data may include data and / or control signaling. In some implementations, the sidelink data may be, for example, a Physical Sidelink Control Channel (PSCCH), PSSCH, PSCCH Demodulation Reference Signal (DMRS), PSSCH DMRS, or Physical Sidelink Feedback Channel (PSFCH).

[0025] Some common sidelink communication scenarios are described below with reference to FIG. 1. Depending on whether the terminal device in the sidelink is within the coverage of the network device, the sidelink communication may include three scenarios. In Scenario 1, the terminal device performs sidelink communication within the coverage of the network device. In Scenario 2, a part of the terminal device performs sidelink communication within the coverage of the network device. In Scenario 3, the terminal device performs sidelink communication outside the coverage of the network device.

[0026] As shown in FIG. 1, in Scenario 1, terminal devices 121 and 122 can communicate with each other via the sidelink, and both terminal devices 121 and 122 are within the coverage of network device 110, or in other words, both terminal devices 121 and 122 are within the coverage of the same network device 110. In this scenario, network device 110 may transmit configuration signaling to terminal devices 121 and 122, and thus, terminal devices 121 and 122 communicate with each other via the sidelink based on the configuration signaling.

[0027] As shown in FIG. 1, in Scenario 2, terminal devices 123 and 124 can communicate with each other via sidelink. Terminal device 123 is within the coverage of network device 110, while terminal device 124 is outside the coverage of network device 110. In this scenario, terminal device 123 receives configuration information from network device 110 and communicates via sidelink based on the configuration of the configuration signaling. However, since terminal device 124 is outside the coverage of network device 110, terminal device 124 cannot receive configuration information from network device 110. In this case, terminal device 124 may obtain the configuration of sidelink communication based on the pre-configured configuration information and / or the configuration information transmitted by terminal device 123 within the coverage in order to communicate with terminal device 123 via sidelink based on the obtained configuration.

[0028] In some cases, terminal device 123 may transmit configuration information to terminal device 124 through the Physical Sidelink Broadcast Channel (PSBCH) to configure terminal device 124 to communicate via sidelink.

[0029] As shown in FIG. 1, in Scenario 3, all of terminal devices 125 to 129 are outside the coverage of network device 110 and cannot communicate with network device 110. In this case, all terminal devices may perform sidelink communication based on pre-configuration information.

[0030] In some cases, terminal devices 127 to 129 outside the coverage of the network device may form a communication cluster, and the terminal devices 127 to 129 within the communication cluster can communicate with each other. In addition, terminal device 127 within the communication cluster may act as a central control node, also referred to as a Cluster Head (CH). Correspondingly, the other terminal devices within the communication cluster may sometimes be referred to as "cluster members".

[0031] The terminal device 127 as CH may have one or more of the following functions, namely, establishing a communication cluster, participating in and leaving the cluster members, resource coordination, allocating sidelink transmission resources for the cluster members, receiving sidelink feedback information from the cluster members, resource coordination with another communication cluster, and other functions.

[0032] Note that FIG. 1 exemplarily shows a network device and a plurality of terminal devices. Optionally, the wireless communication system 100 may include a plurality of network devices, and another number of terminal devices may be included in the coverage of each network device, which is not limited in this embodiment of the present application.

[0033] Optionally, the wireless communication system 100 may further include other network entities such as a network controller and a mobility management entity, which is not limited in this embodiment of the present application.

[0034] It should be understood that the technical solutions in the embodiments of the present application can be applied to various communication systems, such as the fifth generation (5G) system or the new radio (NR) system, the long term evolution (LTE) system, the LTE frequency division duplexing (FDD) system, and the LTE time division duplexing (TDD). The technical solutions provided in the present application can also be applied to future communication systems such as the sixth generation mobile communication system and the satellite communication system.

[0035] The terminal device in the embodiments of this application may also be referred to as a user equipment (UE), access terminal, subscriber unit, subscriber station, mobile, mobile station (MS), mobile terminal (MT), remote station, remote terminal, mobile device, user terminal, wireless communication device, user agent, or user device. The terminal device in the embodiments of this application is a device that provides voice and / or data connectivity to the user and can connect people, things, and machines such as handheld devices or in-vehicle devices having a wireless connection function. The terminal device in the embodiments of this application may be a mobile phone, tablet computer (tablet), notebook computer, palmtop computer, mobile Internet device (MID), wearable device, vehicle, wireless terminal in industrial control, wireless terminal in autonomous driving, wireless terminal in remote medical surgery, wireless terminal in smart grid, wireless terminal in transportation safety, wireless terminal in smart city, wireless terminal in smart home, etc. Optionally, the terminal device may be used to act as a base station. For example, the terminal device may act as a scheduling entity that provides sidelink signals between terminal devices in vehicle-to-everything (V2X) or D2D, etc. For example, a cellular phone and a vehicle communicate with each other using sidelink data. A cellular phone and a smart home device communicate with each other without relaying communication signals through a base station.

[0036] The network device in the embodiment of the present application may be a device for communicating with a terminal device. The network device may also be referred to as an access network device or a wireless access network device. For example, the network device may be a base station. The network device in the embodiment of the present application may be a radio access network (RAN) node (or device) that connects a terminal device to a wireless network. The base station can widely cover various names hereinafter, or the following names, for example, Node B, evolved Node B (eNB), next-generation Node B (gNB), relay station, transmission and reception point (TRP), transmission point (TP), access point (AP), master eNB MeNB, secondary eNB SeNB, multi-standard radio (MSR) node, home base station, network controller, access node, radio node, transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), and positioning node may be interchangeable. The base station may be a macro base station, a micro base station, a relay node, a donor node, etc., or a combination thereof. Alternatively, the base station may be a communication module, a modem, or a chip disposed in the device or apparatus described above. Alternatively, the base station may be a device responsible for the functions of a base station in mobile switching center, D2D, V2X, and machine-to-machine (M2M) communication, a network-side device in a 6G network, a device responsible for the functions of a base station in a future communication system, etc. The base station can support networks of the same or different access technologies. The specific technology and specific device form used by the network device are not limited in the embodiment of the present application.

[0037] The base station may be fixed or mobile. For example, a helicopter or a drone may be configured to act as a mobile base station, and one or more cells may move according to the position of the mobile base station. In other examples, a helicopter or a drone may be configured to act as a device communicating with another base station.

[0038] In some deployments, the network device in the embodiments of the present application may be a CU or a DU, or the network device includes a CU and a DU. The gNB may further include an AAU.

[0039] The network device and the terminal device may be deployed on land, including indoors or outdoors, handheld or vehicle-mounted, or may be deployed on water, or may be deployed on aircraft, balloons, and satellites in the air. In the embodiments of the present application, the scenario of where the network device and the terminal device are located is not limited.

[0040] It should be understood that all or part of the functions of the communication device in the present application may also be implemented by software functions operating on hardware or by virtualized functions instantiated on a platform (such as a cloud platform).

[0041] Communication mode for sidelink With the development of sidelink communication technology, sidelink communication technology is related to information exchange between various terminal devices. Taking the V2X communication system 200 shown in FIG. 2 as an example, vehicle-to-vehicle (V2V) communication between the terminal device 201 and the terminal device 202 is related to information exchange between vehicles themselves. Similarly, vehicle-to-infrastructure (V2I) communication, vehicle-to-network (V2N) communication, and vehicle-to-pedestrian (V2P) communication between the terminal device 201 and the terminal devices 203 to 205 are related to information exchange between the vehicle and an external system.

[0042] The gradual expansion of the information exchange range imposes higher requirements on the communication system. For example, the communication system is required to support higher throughput, lower latency, higher reliability, larger coverage, more flexible resource allocation, etc. Taking the development of V2X as an example, in LTE-V2X, only the broadcast mode is supported between terminal devices for sidelink communication. In NR-V2X, it is possible to support three communication modes, namely, broadcast, groupcast, and unicast.

[0043] Broadcast is the most basic communication mode in sidewalk communication. In the case of the broadcast transmission mode, sidelink data can be received by any terminal device around the terminal device acting as the transmitter end. For example, referring to FIG. 1, assuming that the terminal device 125 transmits sidelink data in the broadcast mode as the transmitter end, any of the terminal devices 121 to 124 around the terminal device 125 and the terminal devices 126 to 129 can be used as the receiver end of the sidelink data.

[0044] Groupcast communication is used to support information exchange between terminal devices within a specific group (also called a communication cluster) in order to assist in the negotiation and decision-making between terminal devices within that group. Sidelink groupcast has two transmission types. Type 1 is for a managed group with a stable connection relationship having explicit ID information and group member information. Type 2 is for a connectionless group formed in a connectionless manner, for example, for a groupcast formed dynamically based on distance where the communication distance of the current service needs to be clearly indicated.

[0045] In the case of the groupcast transmission mode, sidelink data can be received by all terminal devices within a communication cluster. Alternatively, sidelink data can be received by all terminal devices within a specific transmission range. For example, referring to FIG. 1, in the case of a communication cluster including terminal devices 127 to 129, when terminal device 127 transmits sidelink data in the groupcast mode, all other terminal devices 128 and 129 within the communication cluster are the terminal devices that receive the sidelink data. In another example, referring to FIG. 1, assuming that the terminal devices within a preset range include terminal devices 127 to 129, when terminal device 127 transmits sidelink data in the groupcast manner, all other terminal devices 128 and 129 within the preset range are the terminal devices that receive the sidelink data.

[0046] Unicast communication enables sidelink communication between two terminal devices. Taking NR-V2X as an example, radio resource control (RRC) signaling based on the PC5 interface enables reliable communication between one terminal device and another terminal device.

[0047] In the case of the unicast transmission mode, usually, there is only one terminal device that receives sidelink data. Referring to FIG. 1, terminal device 121 and terminal device 122 may communicate in the unicast transmission mode. For example, when terminal device 121 performs sidelink communication with terminal device 122, terminal device 122 receives the sidelink data as the only receiving device. The sidelink data may include PSSCH and PSCCH. Through demodulation, terminal device 122 can obtain sidelink control information (SCI) related to sidelink transmission and scheduling. The SCI can help terminal device 122 receive and decode sidelink information.

[0048] In some communication systems (e.g., NR-V2X), sidelink unicast and groupcast services support a hybrid automatic repeat request (HARQ) mechanism by means of an acknowledgement (ACK) / negative acknowledgement (NACK). For groupcast services, HARQ with only NACK may also be used. In addition, a blind retransmission mechanism is further supported. Sidelink HARQ feedback is transmitted on the PSFCH by a terminal device at the receiver side to a terminal device at the transmitter side.

[0049] Resource pool for sidelink In some communication systems (e.g., NR), two resource configuration modes for sidelink resources, namely mode 1 and mode 2, are defined. In mode 1, the network device schedules sidelink resources for the terminal device. For example, in FIG. 1, terminal devices 121 to 123 are within the coverage of network device 110, and network device 110 may allocate sidelink resources for terminal devices 121 to 123.

[0050] In mode 2, the terminal device independently selects sidelink resources within the resource pool. The processes performed by the terminal device in this mode include a resource probing process and / or a resource selection process. In the resource probing process, the terminal device may detect the occupancy of sidelink resources by demodulating the SCI. Alternatively, the terminal device may detect the occupancy of sidelink resources by measuring the received power of the sidelink. For example, terminal devices 124 to 129 in FIG. 1 are outside the coverage of network device 110, and each of terminal devices 124 to 129 may independently select sidelink resources in mode 2.

[0051] The side-link resource pool to which the embodiments of the present application are applicable will be described below by taking the NR-V2X resource pool as an example with reference to FIG. 3. A subchannel can be understood as the minimum granularity of PSSCH resource allocation specified in NR-V2X. As shown in FIG. 3, the side-link resource pool includes M subchannels, namely, subchannel 0, subchannel 1, …, and subchannel M-1. Each subchannel may be composed of N SubCHsize physical resource blocks (PRBs), where the value of N SubCHsize is 10, 12, 15, 20, 25, 50, 75, or 100. In the time domain, the terminal device may be composed of M×N SubCHsize PRBs in a specific slot, and M×N SubCHsize PRBs can be used for one transmission. If the resource pool includes T slots, the resource pool that the terminal device can select alone therefrom is M×N SubCHsize ×T PRBs.

[0052] Taking the unicast communication between terminal device A and terminal device B as an example, in the resource pool, terminal device A as the transmitter end may sequentially select resources for side-link communication with terminal device B at the receiver end. For example, terminal device A may directly perform side-link communication with terminal device B on a part of the frequency resources within the same slot or within the next slot. Alternatively, terminal device A may select a part of the resources in each subchannel of each slot for side-link communication with terminal device B.

[0053] System frame structure for side-link The frame structure (slot structure) of the sidelink system frame to which the embodiments of the present application are applicable will be described below with reference to FIGS. 4 and 5. The system frame is a single slot including 14 time domain symbols. FIG. 4 shows the frame structure of the system frame that does not carry the PSFCH. FIG. 5 shows the frame structure of the system frame that carries the PSFCH.

[0054] The SCI in FIGS. 4 and 5 is composed of two parts, namely, the first stage SCI-1 and the second stage SCI-2. The first stage SCI-1 is transmitted on the PSCCH, and the second stage SCI-2 is transmitted on the PSSCH.

[0055] Referring to FIG. 4, in the time domain, the SCI-1 transmitted on the PSCCH occupies two or three sidelink symbols starting from the second sidelink symbol (e.g., orthogonal frequency division multiplexing (OFDM) symbol) of the system frame. The transmission of the PSCCH at the start position of the slot helps the PSCCH to be acquired in advance by the terminal device as the receiver end, thereby reducing the power consumption of the terminal device. In the frequency domain, the PSCCH may occupy a plurality of PRBs. Usually, in order to reduce the complexity of the blind detection of the PSCCH by the terminal device, only one configuration of the number of PSCCH symbols and the number of PRBs is permitted in one resource pool.

[0056] Still referring to FIG. 4, in the time domain, the SCI-2 transmitted on the PSSCH also starts from the second sidelink symbol of the system frame and ends at the second sidelink symbol from the end of the system frame. In the frequency domain, the PSSCH occupies a plurality of subchannels of the system frame. As shown in FIG. 3, each subchannel includes N consecutive PRBs.

[0057] Therefore, a part of the PSCCH and its related PSSCH are transmitted on resources that overlap in time but not in frequency, and other parts of the PSSCH and PSCCH are transmitted on resources that do not overlap in time.

[0058] Normally, the first sidelink symbol in a slot is a repetition of the second sidelink symbol. When a terminal device receives a system frame, the first sidelink symbol can be used as an automatic gain control (AGC) symbol. Data on the AGC symbol is usually not used for data demodulation. The last symbol in a slot is a guard gap GAP symbol.

[0059] Referring to FIG. 5, when the PSFCH channel is carried in a slot, the second last sidelink symbol and the third last sidelink symbol in the system frame are used for PSFCH transmission. In addition, the GAP symbol needs to be reserved after both the PSSCH and the PSFCH. The value range of the PSFCH resource pre-configuration period can be {1, 2, 4} slots.

[0060] Communication spectrum for sidelink The spectrum used by a communication system includes an authorized spectrum and an unlicensed spectrum. An important direction for the expansion of a communication system into different fields is the use of the unlicensed spectrum. For example, NR deployed on the unlicensed spectrum is called NR-U.

[0061] Currently, sidelink mainly uses the authorized spectrum. Sidelink can also use the unlicensed spectrum. A sidelink deployed on the unlicensed spectrum may be called SL-U.

[0062] Compared with the licensed spectrum, the unlicensed spectrum has the function of sharing without permission. For operators, spectrum sharing can promptly promote spectrum aggregation and dynamically support high-bandwidth services. Spectrum sharing can also extend the benefits of communication technologies (e.g., NR) to operating entities that cannot access the licensed spectrum.

[0063] The unlicensed spectrum needs to consider the coexistence of different radio access technology (RAT) systems, e.g., typically wireless fidelity (Wi-Fi) systems and LTE-based licensed-assisted access (LAA) systems. Different systems use frequency bands in the unlicensed spectrum in a spectrum contention manner according to the principles of channel access fairness and multi-RAT coexistence.

[0064] In the unlicensed spectrum, any RAT system needs to conduct communication under the constraints of unlicensed spectrum regulation rules. The regulation rules include power level and power spectral density level, maximum COT, channel occupancy bandwidth, and channel monitoring mechanism. In the same frequency band, each system needs to meet the requirements of the regulation rules and reasonably occupy and release the channel to avoid causing interference to another RAT system in the same frequency band. For example, to support different RATs in the unlicensed spectrum, the communication between sidelink terminal devices is subject to the above-mentioned regulation rules.

[0065] For the use of the unlicensed spectrum, the RAT system may adopt an essential channel monitoring technology (e.g., LBT) to access the network. In other words, data can only be transmitted when it is detected that the current channel is not occupied. For example, the sidelink terminal device may start LBT, and LBT can be Category 2 (Cat 2) LBT or Category 4 (Cat 4) LBT.

[0066] After obtaining channel resources through LBT, the terminal device may perform corresponding detections and transmit data based on the above-mentioned regulation rules. For example, when the terminal device transmits data via the channel resources, the COT limit needs to be satisfied. In other words, continuous data transmission should be restricted within the COT time. If this time is exceeded, the terminal device needs to release the channel and perform LBT again.

[0067] Based on the above description, in the unlicensed spectrum, it can be understood that the sidelink terminal device obtains sidelink channel resources through LBT. Based on the constraints of the unlicensed spectrum regulation rules, the terminal device can obtain the COT information of the sidelink channel resources.

[0068] Within the COT, the direction of data transmission can change. The terminal device that obtains the COT information may use the resources within the COT to transmit data to the terminal device at the receiver end of the sidelink, and the terminal device at the receiver end may also use the resources to transmit data to the terminal device at the transmitter end. If the resources within the COT are not exhausted, the remaining COT resources can also be shared with other sidelink terminal devices. Therefore, the terminal device can perform COT sharing with other terminal devices based on the COT information to avoid wasting resources.

[0069] How to implement COT sharing is an urgent issue to be solved. The communication method according to an embodiment of the present application will be described below with reference to FIG. 6. The sharing method of the COT sharing information proposed in this method improves the utilization rate of the sidelink channel resources.

[0070] The communication method shown in FIG. 6 is described from the perspective of the interaction between a first terminal device and a second terminal device. The first terminal device and the second terminal device in FIG. 6 may be two terminals in sidelink communication, for example, a vehicle and a pedestrian or two vehicles in V2X. The first terminal device may be a sidelink transmitting terminal, and the second terminal device may be a receiving terminal. Alternatively, the first terminal device may be a sidelink receiving terminal, and the second terminal device may be a transmitting terminal.

[0071] The first terminal device may perform unicast communication, groupcast communication, or broadcast communication with the second terminal device. When the first terminal device performs unicast communication, the second terminal device may be a receiving terminal. When the first terminal device performs groupcast communication, the second terminal device may be a receiving terminal within the communication cluster.

[0072] Referring to FIG. 6, the first terminal device and the second terminal device interact through a first sidelink channel. The first terminal device may transmit the first sidelink channel to the second terminal device via the first sidelink, and the second terminal device receives the first sidelink channel. Alternatively, the second terminal device transmits the first sidelink channel to the first terminal device, and the first terminal device receives the first sidelink channel.

[0073] The first sidelink channel may include one or more of channels such as PSCCH, PSSCH, and PSFCH.

[0074] As shown in FIG. 6, the first sidelink channel further includes first COT shared information (COT-SI). The first COT shared information may be used to share resources (time domain resources and / or frequency domain resources) within the COT with other terminal devices.

[0075] In some embodiments, the first COT sharing information may be carried in the PSCCH. Since the PSCCH is located before the slot, another terminal device can obtain the first COT sharing information as early as possible.

[0076] In some embodiments, the first COT sharing information may be carried in the PSSCH. The first COT sharing information may be transmitted on resources that overlap in time but not in frequency, together with a part of the PSSCH.

[0077] The first COT sharing information may occupy one symbol or a plurality of symbols. The plurality of symbols may be, for example, two consecutive symbols.

[0078] The first COT sharing information may be located on any symbol of the PSSCH. For example, the first COT sharing information may be located on a symbol adjacent to the SCI, or on a symbol not adjacent to the SCI. This will be described in detail below with reference to FIGS. 7 to 10 using an example where the time domain resources where the first COT sharing information and the SCI are located are adjacent.

[0079] The first COT sharing information may include various types of COT sharing information. The plurality of types of COT sharing information may have a one-to-one correspondence with a plurality of communication modes. For example, when the first COT sharing information includes the second COT sharing information and the third COT sharing information, the second COT sharing information may correspond to the first communication mode, and the third COT sharing information may correspond to the second communication mode.

[0080] The first communication mode or the second communication mode may be one of a plurality of transmission modes of the sidelink, which is not limited in this specification. For example, the first communication mode may be unicast communication or groupcast communication.

[0081] In some embodiments, the first COT sharing information may include the second COT sharing information. The first communication mode corresponding to the second COT sharing information may be unicast communication. The second COT sharing information corresponds to unicast communication, that is, the second COT sharing information is COT sharing information for unicast communication. For example, the second COT sharing information may indicate one or more sharable resources, and the one or more resources can be shared for use by a terminal device based on unicast communication on another sidelink. In some embodiments, the second COT sharing information is COT-SI unicast represented by.

[0082] In some embodiments, the first COT sharing information may include the third COT sharing information. The second communication mode corresponding to the third COT sharing information may be groupcast communication. The third COT sharing information corresponds to groupcast communication, that is, the third COT sharing information is COT sharing information for groupcast communication. For example, the third COT sharing information may indicate one or more sharable resources, and the one or more resources can be shared for use by other terminal devices within the same communication cluster as the first terminal device. In some embodiments, the third COT sharing information is COT-SI cast represented by.

[0083] In some embodiments, the first COT sharing information may include both the second COT sharing information and the third COT sharing information described above.

[0084] In some embodiments, the first COT sharing information may include information indicating the start time and end time of the COT of the first terminal device. For example, the first COT sharing information may include the start time and end time of the COT. In another example, the first COT sharing information may include the start time and duration of the COT.

[0085] In some embodiments, the first COT sharing information may further be used to indicate various types of resource information. For example, the first COT sharing information may indicate the LBT bandwidth supported within the COT. In another example, the first COT sharing information may indicate the unused resources within the COT. The unused resources are the remaining resources within the current COT. In another example, the first COT sharing information may indicate the resources permitted for use by a third terminal device participating in COT sharing. In the case of the third terminal device, the third terminal device may participate in the sharing of COT resources by detecting the first COT sharing information.

[0086] Based on the information or resources indicated by the COT sharing information, and the communication mode corresponding to the COT sharing information, the first terminal device can reasonably allocate the resources within the COT to other terminal devices. For example, the resources may be allocated based on the priorities of other terminal devices. This will be described in detail below.

[0087] As can be seen from FIG. 6, the first COT sharing information is carried on the first sidelink channel, and the sidelink terminal device can obtain various indication information of the shared resources within the COT. Based on the indication information, the terminal device can specify the duration of COT sharing and the remaining resources in order to utilize the sidelink channel resources corresponding to the COT sharing more reasonably and effectively.

[0088] As described above, the first COT sharing information (COT-SI) may be carried on the PSSCH of the first sidelink channel. Taking the COT-SI adjacent to the SCI as an example, different frame structures including the COT-SI will be described in detail below with reference to FIGS. 7 to 10. FIG. 7 is a schematic diagram of a frame structure including COT-SI and not carrying the PSFCH. FIG. 8 is a schematic diagram of a frame structure including COT-SI and carrying the PSFCH.

[0089] The SCI includes SCI-1. That COT-SI is adjacent to the SCI may mean that the time-domain resources of COT-SI and SCI-1 are adjacent. When the last symbol where SCI-1 is located is set as the first symbol, the time-domain resource where COT-SI is located is one symbol following the first symbol or a plurality of consecutive symbols.

[0090] As shown in FIGS. 7 and 8, COT-SI occupies two consecutive symbols. SCI-1 is located on the second symbol to the fourth symbol of the frame structure, and the fourth symbol may be the first symbol. COT-SI is located on the fifth symbol and the sixth symbol. In other words, the time-domain resources of COT-SI and SCI-1 are adjacent.

[0091] Compared with FIGS. 4 and 5 above, in the time domain, the terminal device can obtain the indication information of COT-SI on the next symbol immediately after demodulating the PSCCH.

[0092] As described above, COT-SI may further include second COT shared information and third COT shared information. The second COT shared information and the third COT shared information may be transmitted as a whole in the manner shown in FIG. 7 or FIG. 8, or each may be transmitted on one or more symbols. FIG. 9 is a schematic diagram of a frame structure having COT-SI divided into two parts and not carrying PSFCH. FIG. 10 is a schematic diagram of a frame structure having COT-SI divided into two parts and carrying PSFCH.

[0093] The second COT sharing information and the third COT sharing information may each occupy one or more symbols. The first sidelink channel includes SCI-1 and SCI-2. The second COT sharing information may be adjacent to the time domain resource where SCI-1 is located, and the third COT sharing information may be adjacent to the time domain resource where SCI-2 is located. Alternatively, the third COT sharing information may be adjacent to the time domain resource where SCI-1 is located, and the second COT sharing information may be adjacent to the time domain resource where SCI-2 is located.

[0094] As shown in FIGS. 9 and 10, the two parts of COT-SI are the second COT sharing information and the third COT sharing information, each of which occupies one symbol. The last symbol of SCI-1 is the fourth symbol, and the second COT sharing information or the third COT sharing information is located on the fifth symbol adjacent to the time domain resource where SCI-1 is located. The last symbol of SCI-2 is the third symbol, and the third COT sharing information or the second COT sharing information is located on the fourth symbol adjacent to the time domain resource where SCI-2 is located.

[0095] In FIGS. 9 and 10, when the second COT sharing information is COT-SI unicast and the third COT sharing information is COT-SI cast , COT-SI unicast and COT-SI cast are each represented by one symbol adjacent to the SCI. By demodulating the SCI, the terminal device can obtain the indication information of COT-SI corresponding to unicast and groupcast as soon as possible.

[0096] The interaction between the first terminal device and the second terminal device through the first sidelink channel and the design example of the frame structure of the first COT sharing information in the first sidelink channel have been described above with reference to FIGS. 6 to 10. The first COT sharing information is used to indicate the status of the resources that can be shared within the COT. The status of the resources within the COT sharing will be described in detail below with reference to FIG. 11.

[0097] As shown in FIG. 11, after LBT, the terminal device may acquire the channel resources within the COT. In the frequency domain, the channel resources include a plurality of sub-channels shown in FIG. 3. In the time domain, the channel resources include T slots within the COT. When there are M sub-channels and each sub-channel includes N SubCHsize physical resource blocks (PRBs), the total size of the resources for COT sharing initiated by the terminal device is M×N SubCHsize ×T PRBs.

[0098] In the sidelink groupcast communication mode and the unicast communication mode, after the resources within the COT are used for communication between the terminal devices within the communication cluster, there may be remaining unused resources. As described above, these remaining resources may be shared with other sidelink terminal devices outside the communication cluster to improve the utilization rate of the sidelink channel resources within the COT.

[0099] Furthermore, when multiple sidelinks are expected to participate or the remaining resources within the COT cannot meet the requirements of all sidelinks, it is necessary to consider how to allocate resources to avoid collisions.

[0100] To better utilize the resources within the COT, the communication method provided in another embodiment of the present application can reasonably allocate the resources within the COT based on the COT sharing information.

[0101] A communication method according to another embodiment of the present application will be described below with reference to FIG. 12. The communication method shown in FIG. 12 will be described from the perspective that the first terminal device transmits the first sidelink channel to the second terminal device, and the second terminal device receives the first sidelink channel. The first terminal device and the second terminal device in FIG. 12 may be two terminals in sidelink communication, for example, a vehicle and a pedestrian or two vehicles.

[0102] The difference from FIG. 6 is that the first terminal device is the transmitting terminal of the sidelink, and the second terminal device is the receiving terminal. In some embodiments, the first terminal device obtains resources within the COT through LBT, and the first terminal device may also be called the starting terminal of COT sharing.

[0103] The second terminal device may be one or more receiving terminals on the sidelink that transmit the first sidelink channel, or one or more terminal devices on another sidelink. In other words, the second terminal device may be a terminal device within the communication cluster where the first terminal device is located, or a terminal device outside the communication cluster where the first terminal device is located. For the sake of brevity, in the following description, the in-cluster terminal device is used to represent the second terminal device within the communication cluster where the first terminal device is located, and the out-of-cluster terminal device is used to represent the second terminal device outside the communication cluster where the first terminal device is located.

[0104] In some embodiments, the second terminal device may be an in-cluster terminal device. The second terminal device may receive the first sidelink channel via the sidelink of the first terminal device.

[0105] In some embodiments, the second terminal device may be an out-of-cluster terminal device. The second terminal device may receive the first sidelink channel through detection. The detection may be, for example, the detection of sidelink sharing by the second terminal device through LBT.

[0106] The in-cluster terminal device may be a terminal device at the receiver end in unicast communication, or may be a plurality of terminal devices in groupcast communication. The out-of-cluster terminal device may be one or more terminal devices outside the unicast and / or groupcast communication cluster. The in-cluster terminal device and the out-of-cluster terminal device in this embodiment of the present application are respectively described based on the unicast communication mode and the groupcast communication mode with reference to FIGS. 13 and 14.

[0107] The first sidelink channel also includes first COT sharing information. The first COT sharing information may further be used to indicate that the first terminal device has allocated the first resource within the COT to the second terminal device.

[0108] When the first COT sharing information includes second COT sharing information and third COT sharing information, the second COT sharing information and the third COT sharing information may indicate the first resource based on the corresponding communication mode. In some embodiments, when the first communication mode corresponding to the second COT sharing information is unicast, the first resource indicated by the second COT sharing information may be allocated to the corresponding terminal device. Other terminal devices can also detect the COT sharing information. In some embodiments, when the second communication mode corresponding to the third COT sharing information is groupcast, the first resource indicated by the third COT sharing information is allocated only to the cluster members. In other words, the first resource indicated by the COT sharing information for groupcast communication may be exclusive to the cluster members, and the out-of-cluster terminal device may not be able to communicate via the resource.

[0109] The first COT sharing information may indicate various types of information about the first resource. In some embodiments, the first COT sharing information may indicate a time region and / or a frequency region resource within the COT allocated to the second terminal device. In some embodiments, alternatively, the first COT sharing information may indicate a permitted duration of use of the first resource. In some embodiments, alternatively, the first COT sharing information may indicate a time when a second terminal device outside the communication cluster is permitted to access via the first resource.

[0110] The fact that the first terminal device allocates a first resource within the COT to the second terminal device may mean that the first terminal device allocates the resource to a terminal device within the cluster, or that the first terminal device allocates the remaining unused resources within the COT to a terminal device outside the cluster.

[0111] The first resource allocated by the first terminal device may be determined based on various types of information. The various types of information are, for example, whether the second terminal device is a terminal device within the communication cluster where the first terminal device is located, the priority corresponding to the second terminal device, and the type and priority of the second terminal device.

[0112] As a possible implementation form, when the second terminal device is a terminal device within the cluster, the first terminal device may allocate the first resource based on the cluster priority method. In other words, the cluster member has the highest priority, and the resources within the COT are preferentially allocated to the cluster members. In some embodiments, the first resource is allocated to one or more terminal devices within the cluster in the simplest manner. For example, in groupcast communication, the first terminal device may allocate time domain resources to the second terminal device according to a sequence of slots, and may also allocate frequency resources in different sub-channels within the same slot.

[0113] In some embodiments, the terminal device within the cluster may transmit the PSFCH to the first terminal device via the first resource. When the number of NACKs fed back by the second terminal device on the sidelink reaches a specific value, the first terminal device triggers a retransmission and still preferentially allocates resources to the second terminal device. In some embodiments, when the number of NACKs fed back by the second terminal device is greater than the first threshold, the first terminal device allocates resources for retransmission to the second terminal device from the resources within the COT. The first threshold may be a positive integer, for example, 3.

[0114] As a possible implementation form, when the second terminal device is a terminal device outside the cluster, the first resource may be allocated based on the priority corresponding to the second terminal device. The priority corresponding to the second terminal device may be determined based on the first parameter. The first parameter may be related to one or more of the following information: the sidelink corresponding to the second terminal device, the resources required by the second terminal device, the queue where the second terminal device is located, the waiting time of the second terminal device for resource allocation from the first terminal device, and the NACK fed back by the second terminal device to the first terminal device.

[0115] The first parameter may be a specific parameter of the above-described information related to the priority of the second terminal device, or may directly indicate the priority and be data derived from a specific parameter of one or more of the above-described types of information, or may be data derived from a plurality of specific parameters of the information, which is not limited herein.

[0116] In some embodiments, the first parameter may be determined based on the sidelink related information corresponding to the second terminal device to indicate the priority of the second terminal device. The related information may be, for example, the signal quality of the sidelink. The signal quality may be determined based on parameters such as the reference signal received power (RSRP), reference signal received quality (RSRQ), and / or signal-to-interference-plus-noise ratio (SINR) of the sidelink. The first terminal device may compare the signal qualities of different sidelinks or compare the signal quality of the sidelink with a specified threshold to determine the priority corresponding to the second terminal device.

[0117] Taking RSRP as an example, the higher the RSRP, the shorter the communication distance, or the better the communication environment, the better the resources within the COT can be provided to the terminal device corresponding to better services. Therefore, the first terminal device may set a threshold RSRP. If the RSRP of the sidelink corresponding to the second terminal device is greater than the RSRP, the second terminal device may have a higher priority. target The first terminal device may set a threshold RSRP. If the RSRP of the sidelink corresponding to the second terminal device is greater than the RSRP target the second terminal device may have a higher priority.

[0118] In some embodiments, the first parameter may be determined based on the resource information required by the second terminal device. The resource information may be, for example, the size of the COT resources required by the second terminal device or the type of the COT resources. For example, the second terminal device that requires smaller COT resources may have a higher priority.

[0119] In some embodiments, the first parameter may be determined based on the relevant information of the queue where the second terminal device is located. When multiple sidelinks share COT resources, different terminal devices corresponding to the multiple sidelinks may be set as multiple ready queues. The relevant information of the queue may be the priority sequence of each queue, or the length of each queue, or the time required for the execution of each queue, etc. For example, the higher the priority of the queue, the higher the priority of the terminal device in the queue. In another example, a queue with a high priority may be allocated to the first slot in the COT. The time-frequency resources start to be allocated to the next queue only when the queue with a high priority is idle.

[0120] In some embodiments, the first parameter may be determined based on the waiting time of the second terminal device for resource allocation from the first terminal device to prevent the second terminal device from waiting too long without obtaining resources. For example, a service rate coefficient may be set in the first parameter such that the priority of the terminal device increases at a rate a as the waiting time increases.

[0121] In some embodiments, the first parameter may be determined based on the relevant information of the NACK feedback from the second terminal device to the first terminal device. The relevant information of the NACK may be the number of NACKs feedback, or the slot where the NACKs feedback are located, etc.

[0122] Taking, as an example, the number of NACKs fed back by the second terminal device, the first terminal device may set a threshold related to NACKs, such as a second threshold. When the second threshold represents the number of NACKs, the second threshold may also be a positive integer, for example, 3 or 5. Specifically, when the number of NACKs fed back by the second terminal device is greater than the second threshold, the first terminal device may adjust the first parameter of the second terminal device to lower its priority. Alternatively, when the number of NACKs fed back by the second terminal device is greater than the second threshold, the first terminal device may no longer allocate resources to the second terminal device corresponding to the sidelink.

[0123] In some embodiments, alternatively, the first parameter may be determined based on various types of related information of the second terminal device. As a possible implementation, the priority corresponding to the second terminal device may be determined based on a plurality of the following information, that is, the signal quality of the sidelink corresponding to the second terminal device, the size of the resources required by the second terminal device, the priority of the queue in which the second terminal device is located, the waiting time of the second terminal device for resource allocation from the first terminal device, and the number of NACKs fed back by the second terminal device to the first terminal device. For example, when the RSRP of the sidelinks corresponding to a plurality of second terminal devices are all greater than RSRP target the first parameter of the second terminal device that requires the smallest COT resource may indicate that the second terminal device has the highest priority.

[0124] When the resources shared by the first terminal device reach the highest value at a specific moment, for example, the M×N SubCHsize ×T PRBs shown in FIG. 11, the first terminal device stops the allocation. Other terminal devices that will perform sidelink communication may continue monitoring or wait for the next allocation.

[0125] After receiving the first sidelink channel, the second terminal device may obtain first COT sharing information in the first sidelink channel. In some embodiments, based on the first resources indicated by the first COT sharing information, the in-cluster terminal devices may perform sidelink communication with other members in the cluster. In some embodiments, based on the first resources indicated by the first COT sharing information, the out-of-cluster terminal device may choose an opportunity to participate in the COT shared by the first terminal device and use the remaining resources for sidelink communication. For example, the out-of-cluster terminal device may perform sidelink communication with other terminal devices. The other terminal devices here may be in-cluster devices or other out-of-cluster devices.

[0126] As described above, after receiving the first resource, the second terminal device may feedback to the first terminal device the use of the first resource. In some embodiments, the second terminal device outside the communication cluster may send a PSFCH to the first terminal device to indicate the impact of the first resource on the communication result. For example, when the second terminal device feeds back an ACK, it may indicate that the communication using the first resource is successful. In another example, when the second terminal device feeds back a NACK, it may indicate that the communication using the first resource has failed and resource reallocation is required.

[0127] The second terminal device may further perform feedback indicating the result of the current communication to other terminal devices on the sidelink via the first resource.

[0128] As can be seen from the communication method of the two terminal devices in FIG. 12, the first terminal device can allocate resources within the COT to the second terminal device according to specific rules by transmitting a first sidelink channel including resource allocation information. This rule ensures that resources are preferentially allocated to the terminal devices within the cluster, and the use of resources within the COT can be effectively improved by setting reasonable priority rules for the terminal devices outside the cluster.

[0129] The above-mentioned unicast communication mode and groupcast communication mode in the sidelink will be described in detail below with reference to FIGS. 13 and 14 by taking the unicast communication and groupcast communication in SL-U as an example. FIG. 13 is an exemplary diagram of a unicast communication system in SL-U. FIG. 14 is an exemplary diagram of a groupcast communication system in SL-U.

[0130] Referring to FIG. 13, the SL-U unicast communication system 1300 includes terminal devices 1301 to 1304. After accessing the network through LBT, the terminal device 1301 may start COT sharing. The terminal device 1301 transmits a PSCCH and a PSSCH carrying the first COT sharing information to the terminal device 1302.

[0131] The terminal device 1302 is a terminal device within the cluster that communicates with the terminal device 1301 on the sidelink. The terminal device 1302 obtains the transmission and scheduling information SCI related to the sidelink by demodulating the PSCCH. The SCI can help the terminal device 1302 receive and decode the sidelink information. After receiving the PSSCH, the terminal device 1302 may obtain the first resource indicated by the first COT sharing information.

[0132] Terminal devices 1303 and 1304 are out-of-cluster terminal devices that will perform sidelink communication through COT sharing by terminal device 1301. Terminal devices 1303 and 1304 may obtain first COT sharing information through detection in order to select an opportunity to participate in COT sharing by the first terminal device. The first terminal device 1301 may allocate the first resources to terminal devices 1303 and 1304 according to the above priority principle.

[0133] Referring to FIG. 14, the SL-U groupcast communication system 1400 includes terminal devices 1401 to 1405. Terminal device 1401 communicates with its cluster member terminal devices 1402 to 1405 in groupcast mode.

[0134] Terminal device 1401 is the starting terminal of COT sharing. Cluster member terminal devices 1402 to 1405 receive information from terminal device 1401, demodulate PSCCH / PSSCH, and obtain the starting point, ending point, duration, etc. of COT sharing. The COT sharing information for the corresponding groupcast is exclusive to cluster members. Other non-cluster internal terminals cannot communicate through the shared resources.

[0135] Cluster member terminal devices 1402 to 1405 usually have short communication distances, or the cluster is established for several important reasons. Therefore, when only cluster members perform sidelink communication through COT-shared resources, terminal device 1401 allocates resources in the simplest way.

[0136] Non-cluster internal members are the corresponding unicast COT-SI by terminal device 1401 unicastBy detecting, COT shared information is obtained. Non-cluster members can perform sidelink communication via resources in the corresponding unicast shared information. Therefore, resource allocation by the terminal device 1401 involves cluster members and possibly non-cluster members in some cases.

[0137] The method embodiments of this application are described in detail above with reference to FIGS. 6 to 14. The apparatus embodiments of this application are described in detail below with reference to FIGS. 15 to 16. It should be understood that the description of the apparatus embodiments corresponds to the description of the method embodiments, and therefore, for parts not described in detail, the above method embodiments may be referred to.

[0138] FIG. 15 is a schematic structural diagram of a terminal device according to an embodiment of this application. The terminal device is configured as a first terminal device and may implement the communication method at the transmitter end described above in FIG. 6. As shown in FIG. 15, the terminal device 1500 includes a communication module 1510.

[0139] The communication module 1510 may be configured to transmit a first sidelink channel to a second terminal device via a first sidelink. The first sidelink channel includes first COT shared information. The first COT shared information satisfies one or more of the following: the first COT shared information is carried in the first PSSCH of the first sidelink channel; the first COT shared information includes second COT shared information and third COT shared information, the second COT shared information corresponds to a first communication mode, and the third COT shared information corresponds to a second communication mode.

[0140] Optionally, the first sidelink channel further includes a first PSCCH. The first PSCCH includes a first stage SCI. The time domain resource where the first COT shared information and the first stage SCI are located is adjacent.

[0141] Optionally, the last symbol where the first-stage SCI is located is the first symbol, and the time-domain resource where the first COT sharing information is located includes one symbol following the first symbol or two consecutive symbols.

[0142] Optionally, the first sidelink channel further includes the first-stage SCI and the second-stage SCI, the time-domain resources where the second COT sharing information and the first-stage SCI are located are adjacent, and the time-domain resources where the third COT sharing information and the second-stage SCI are located are adjacent, or the time-domain resources where the third COT sharing information and the first-stage SCI are located are adjacent, and the time-domain resources where the second COT sharing information and the second-stage SCI are located are adjacent.

[0143] Optionally, the second COT sharing information and the third COT sharing information each occupy one symbol.

[0144] Optionally, the first COT sharing information is used to indicate one or more of the following information, namely, the COT start time, the COT end time, the COT duration, the unused resources within the COT, and the resources permitted to be used by the third terminal device participating in the COT sharing.

[0145] An embodiment of this application further provides a terminal device. The terminal device is configured as a second terminal device and may implement the communication method at the receiver end described above in FIG. 6. The second terminal device includes a communication module.

[0146] The communication module may be configured to receive a first sidelink channel transmitted by a first terminal device via a first sidelink, the first sidelink channel including first COT sharing information, the first COT sharing information satisfying one or more of the following: the first COT sharing information is carried in a first PSSCH of the first sidelink channel; the first COT sharing information includes second COT sharing information and third COT sharing information, the second COT sharing information corresponding to a first communication mode, and the third COT sharing information corresponding to a second communication mode.

[0147] Optionally, the first sidelink channel further includes a first PSCCH, the first PSCCH including a first stage SCI, and the time domain resource where the first COT sharing information and the first stage SCI are located is adjacent.

[0148] Optionally, the last symbol where the first stage SCI is located is the first symbol, and the time domain resource where the first COT sharing information is located includes one symbol or two consecutive symbols following the first symbol.

[0149] Optionally, the first sidelink channel further includes a first stage SCI and a second stage SCI, and the time domain resources where the second COT sharing information and the first stage SCI are located are adjacent, and the time domain resources where the third COT sharing information and the second stage SCI are located are adjacent, or the time domain resources where the third COT sharing information and the first stage SCI are located are adjacent, and the time domain resources where the second COT sharing information and the second stage SCI are located are adjacent.

[0150] Optionally, the second COT sharing information and the third COT sharing information each occupy one symbol.

[0151] Optionally, the first COT sharing information is used to indicate one or more of the following information, namely, the COT start time, the COT end time, the COT duration, the unused resources within the COT, and the resources permitted to be used by a third terminal device participating in the COT sharing.

[0152] One embodiment of the present application further provides a terminal device. The terminal device is configured as a first terminal device and may implement the communication method at the transmitter end described above with reference to FIG. 12. The first terminal device includes a communication module.

[0153] The communication module may be configured to transmit a first sidelink channel, the first sidelink channel includes first COT sharing information, and the first COT sharing information is used to indicate that the first terminal device allocates a first resource within the COT to a second terminal device. The first resource is determined based on one or more of the following information, namely, whether the second terminal device is a terminal device within the communication cluster where the first terminal device is located, and the priority corresponding to the second terminal device.

[0154] Optionally, the priority corresponding to the second terminal device is determined based on a first parameter, and the first parameter is related to one or more of the following information, namely, the sidelink corresponding to the second terminal device, the resources required by the second terminal device, the queue where the second terminal device is located, the waiting time of the second terminal device for resource allocation from the first terminal device, and the NACK fed back by the second terminal device to the first terminal device.

[0155] Optionally, the first COT sharing information includes second COT sharing information and third COT sharing information, the second COT sharing information corresponds to a first communication mode, and the third COT sharing information corresponds to a second communication mode.

[0156] Optionally, if the second terminal device is a terminal device within the communication cluster, the first resource is allocated based on the cluster priority method.

[0157] Optionally, if the second terminal device is a terminal device within the communication cluster, the communication module is further configured such that when the number of NACKs fed back by the second terminal device is greater than a first threshold, the first terminal device allocates a resource for retransmission from the resources within the COT to the second terminal device.

[0158] Optionally, if the second terminal device is a terminal device outside the communication cluster, the first resource is determined based on the priority of the second terminal device.

[0159] Optionally, if the second terminal device is a terminal device outside the communication cluster, the communication module is further configured such that when the number of NACKs fed back by the second terminal device is greater than a second threshold, the first terminal device lowers the priority of the second terminal device.

[0160] One embodiment of the present application further provides a terminal device. The terminal device is configured as a second terminal device and may implement the communication method at the receiver end described above in FIG. 12. The second terminal device includes a communication module.

[0161] The communication module may be configured to receive a first sidelink channel. The first sidelink channel includes first COT sharing information. The first COT sharing information is used to indicate that the first terminal device has allocated a first resource within the COT to the second terminal device. The first resource is determined based on one or more of the following information, namely, whether the second terminal device is a terminal device within the communication cluster where the first terminal device is located, and the priority corresponding to the second terminal device.

[0162] Optionally, the priority corresponding to the second terminal device is determined based on a first parameter, which is related to one or more of the following information: namely, the sidelink corresponding to the second terminal device, the resources required by the second terminal device, the queue in which the second terminal device is located, the waiting time of the second terminal device for resource allocation from the first terminal device, and the NACK feedback by the second terminal device to the first terminal device.

[0163] Optionally, the first COT sharing information includes second COT sharing information and third COT sharing information, where the second COT sharing information corresponds to a first communication mode and the third COT sharing information corresponds to a second communication mode.

[0164] Optionally, when the second terminal device is a terminal device within a communication cluster, the first resource is allocated based on a cluster priority method.

[0165] Optionally, when the second terminal device is a terminal device outside the communication cluster, the first resource is determined based on the priority of the second terminal device.

[0166] FIG. 16 is a schematic structural diagram of a communication device according to an embodiment of the present application. The dashed lines in FIG. 16 indicate that the units or modules are optional. The device 1600 in FIG. 16 may be configured to implement the methods described in the above method embodiments. The device 1600 may be a chip, a terminal device, or a network device.

[0167] Device 1600 may include one or more processors 1610. The processor 1610 may enable the device 1600 to implement the methods described in the above method embodiments. The processor 1610 may be a general-purpose processor or a dedicated processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may be another general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or another programmable logic device, discrete gate or transistor logic device, or discrete hardware component. The general-purpose processor may be a microprocessor, or the processor may be any conventional processor or the like.

[0168] Device 1600 may further include one or more memories 1620. The memory 1620 stores a program that can be executed by the processor 1610 to cause the processor 1610 to implement the methods described in the above method embodiments. The memory 1620 may be independent of the processor 1610 or may be incorporated into the processor 1610.

[0169] Device 1600 may further include a transceiver 1630. The processor 1610 can communicate with another device or chip through the transceiver 1630. For example, the processor 1610 can transmit and receive data with another device or chip through the transceiver 1630.

[0170] One embodiment of the present application further provides a computer-readable storage medium for storing a program. The computer-readable storage medium can be applied to the terminal or network device provided in the embodiments of the present application, and the program causes the computer to implement the methods that will be implemented by the terminal or network device in various embodiments of the present application.

[0171] One embodiment of the present application further provides a computer program product. The computer program product includes a program. The computer program product can be applied to the terminal or network device provided in the embodiment of the present application, and the program causes a computer to execute a method that will be executed by the terminal or network device in various embodiments of the present application.

[0172] The terms "system" and "network" in the present application may be used interchangeably. In addition, the terms used in the present application are only used to describe specific embodiments of the present application and are not intended to limit the present application. It should be noted that the terms "first", "second", "third", "fourth", etc. in the specification, claims, and drawings of the present application are not used to represent a specific order, but are used to distinguish different objects. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0173] In the embodiments of the present application, "indicate" as described in this specification may refer to a direct indication, or may refer to an indirect indication, or may mean an associated relationship. For example, A indicates B may mean that A directly indicates B, for example, B can be obtained by A, or A indirectly indicates B, for example, A indicates C and B can be obtained by C, or there is an associated relationship between A and B.

[0174] In an embodiment of the present application, the term "corresponding" may mean that there is a direct or indirect correspondence between two, or may mean that there is an association relationship between two, and the association relationship may also be a relationship such as indicating and being indicated, or configuring and being configured, etc.

[0175] In an embodiment of the present application, "predefined" or "pre-configured" may be implemented by pre-storing other forms that can be used to indicate relevant information in corresponding codes, tables, or devices (including, for example, terminal devices and network devices), and the specific implementation form is not limited in the present application. For example, "predefined" may refer to being defined in the protocol.

[0176] In an embodiment of the present application, determining B based on A does not mean determining B based only on A. Instead, B may be determined based on A and / or other information.

[0177] In an embodiment of the present application, the term "and / or" is only used to represent an association relationship between related objects, indicating that there may be three relationships. For example, A and / or B may indicate that only A exists, both A and B exist, or only B exists. In addition, the character " / " in this specification generally indicates an "or" relationship between related objects.

[0178] In the embodiments of this application, the sequence numbers of the above processes do not mean the execution sequence. The execution sequence of the process should be determined according to the functions and internal logics of the process and should not be construed as any limitation to the implementation process of the embodiments of this application.

[0179] In some embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other ways. For example, the described device embodiments are only examples. For example, the unit division is only a logical function division, and in actual implementation, other divisions may be used. For example, multiple units or components may be combined or incorporated into another system, or some functions may be ignored or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be implemented by using some interfaces. The indirect coupling or communication connection between devices or units may be implemented in electrical form, mechanical form, or other forms.

[0180] The units described as separate parts may or may not be physically separated, and the parts shown as units may or may not be physical units, may be located at one position, or may be distributed on multiple network units. Some or all of the units may be selected according to the actual needs to achieve the purpose of the solution of the embodiment.

[0181] In addition, the functional units in the embodiments of this application may be incorporated into one processing unit, or each of the units may physically exist alone, or two or more units may be incorporated into one unit.

[0182] All or part of the above embodiments may be implemented by using software, hardware, firmware, or any combination thereof. When software is used to implement the embodiments, the above embodiments may be implemented entirely or partially in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, the procedures and functions according to the embodiments of the present application are generated entirely or partially. The computer may be a general-purpose computer, a dedicated computer, a computer network, or another programmable device. The computer instructions may 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 may be transmitted in a wired manner (such as coaxial cable, optical fiber, and digital subscriber line (DSL)) or in a wireless manner (such as infrared, wireless, and microwave) from a website, computer, server, or data center to another website, computer, server, or data center. The computer-readable storage medium may be any available medium readable by a computer or a data storage device such as a server or a data center integrating one or more available media. The available media may be a magnetic medium (such as a floppy disk, a hard disk, or a magnetic tape), an optical medium (such as a digital versatile disc (DVD)), a semiconductor medium (such as a solid state drive (SSD)), etc.

[0183] The above description is only a specific implementation form of the present application, and the protection scope of the present application is not limited thereto. Any deformation or substitution that can be easily conceived by those skilled in the art within the technical scope disclosed in the present application shall fall within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Description of Reference Numerals

[0184] 100 Wireless communication system 110 Network device 121, 122, 123, 124, 125, 126, 127, 128, 129 Terminal devices 200 V2X communication system 201, 202, 203, 204, 205 Terminal devices 1300 SL-U unicast communication system 1301, 1302, 1303, 1304 Terminal devices 1400 SL-U groupcast communication system 1401, 1402, 1403, 1404, 1405 Terminal devices 1500 Terminal device 1510 Communication module 1600 Device 1610 Processor 1620 Memory 1630 Transceiver

Claims

1. A communication method, comprising: a step of transmitting, by a first terminal device, a first sidelink channel to a second terminal device via a first sidelink; the first sidelink channel includes first channel occupancy time (COT) sharing information, and the first COT sharing information includes the following, namely: the first COT sharing information is carried in a first physical sidelink shared channel (PSSCH) of the first sidelink channel; and the first COT sharing information includes second COT sharing information and third COT sharing information, the second COT sharing information corresponds to a first communication mode, and the third COT sharing information corresponds to a second communication mode A communication method that satisfies one or more of the above.

2. The first sidelink channel further includes a first physical sidelink control channel (PSCCH), the first PSCCH includes first stage sidelink control information (SCI), and a time domain resource where the first COT sharing information and the first stage SCI are located is adjacent. The communication method according to Claim 1.

3. The last symbol where the first stage SCI is located is a first symbol, and a time domain resource where the first COT sharing information is located includes one symbol or two consecutive symbols following the first symbol. The communication method according to Claim 2.

4. The first sidelink channel further includes a first stage SCI and a second stage SCI, a time domain resource where the second COT sharing information and the first stage SCI are located is adjacent, and a time domain resource where the third COT sharing information and the second stage SCI are located is adjacent, or a time domain resource where the third COT sharing information and the first stage SCI are located is adjacent, and a time domain resource where the second COT sharing information and the second stage SCI are located is adjacent. The communication method according to Claim 1.

5. The second COT sharing information and the third COT sharing information each occupy one symbol. The communication method according to Claim 4.

6. The first COT sharing information includes the following information, namely: COT start time, COT end time, COT duration, unused resources within the COT, and Resources permitted to be used by a third terminal device participating in the COT The communication method according to any one of claims 1 to 5, which is used to indicate one or more of them.

7. A communication method, comprising: receiving, by a second terminal device, a first sidelink channel transmitted by a first terminal device via a first sidelink; wherein the first sidelink channel includes first channel occupancy time (COT) sharing information, and the first COT sharing information includes the following: the first COT sharing information is carried in a first physical sidelink shared channel (PSSCH) of the first sidelink channel; and the first COT sharing information includes second COT sharing information and third COT sharing information, the second COT sharing information corresponding to a first communication mode, and the third COT sharing information corresponding to a second communication mode The communication method satisfying one or more of the above.

8. The communication method according to claim 7, wherein the first sidelink channel further includes a first physical sidelink control channel (PSCCH), the first PSCCH includes first stage sidelink control information (SCI), and time domain resource where the first COT sharing information and the first stage SCI are located are adjacent.

9. The communication method according to claim 8, wherein the last symbol where the first stage SCI is located is a first symbol, and the time domain resource where the first COT sharing information is located includes one symbol or two consecutive symbols following the first symbol.

10. The first sidelink channel further includes a first stage SCI and a second stage SCI, wherein time domain resources where the second COT sharing information and the first stage SCI are located are adjacent, and time domain resources where the third COT sharing information and the second stage SCI are located are adjacent, or time domain resources where the third COT sharing information and the first stage SCI are located are adjacent, and time domain resources where the second COT sharing information and the second stage SCI are located are adjacent. The communication method according to claim 7.

11. The communication method according to claim 10, wherein each of the second COT sharing information and the third COT sharing information occupies one symbol.

12. The first COT sharing information is the following information, that is, COT start time, COT end time, COT duration, unused resources within the COT, and resources permitted to be used by a third terminal device participating in COT sharing The communication method according to any one of claims 7 to 11, which is used to indicate one or more of them.

13. A communication method, comprising: a step of transmitting a first sidelink channel by a first terminal device, the first sidelink channel includes first channel occupancy time (COT) sharing information, and the first COT sharing information is used to indicate that the first terminal device has allocated a first resource within the COT to a second terminal device, the first resource is determined based on one or more of the following information, that is, whether the second terminal device is a terminal device within the communication cluster where the first terminal device is located, and the priority corresponding to the second terminal device A communication method.

14. The priority corresponding to the second terminal device is determined based on a first parameter, and the first parameter is one or more of the following information, that is, the sidelink corresponding to the second terminal device, the resources required by the second terminal device, the queue where the second terminal device is located, the waiting time of the second terminal device for resource allocation from the first terminal device, and the negative acknowledgment (NACK) fed back by the second terminal device to the first terminal device. The communication method according to claim 13.

15. The communication method according to claim 13 or 14, wherein the first COT sharing information includes second COT sharing information and third COT sharing information, the second COT sharing information corresponds to a first communication mode, and the third COT sharing information corresponds to a second communication mode.

16. The communication method according to any one of claims 13 to 15, wherein when the second terminal device is a terminal device within the communication cluster, the first resource is allocated based on a cluster priority method.

17. If the number of NACKs fed back by the second terminal device is greater than a first threshold, the communication method according to claim 16 further includes a step of allocating, by the first terminal device, a resource for retransmission from the resources within the COT to the second terminal device.

18. The communication method according to any one of claims 13 to 17, wherein when the second terminal device is a terminal device outside the communication cluster, the first resource is determined based on the priority of the second terminal device.

19. The communication method according to claim 18, further including a step of lowering the priority of the second terminal device by the first terminal device when the number of NACKs fed back by the second terminal device is greater than a second threshold.

20. A communication method, comprising: receiving, by a second terminal device, a first sidelink channel; the first sidelink channel includes first channel occupancy time (COT) sharing information, and the first COT sharing information is used to indicate that a first terminal device has allocated a first resource within the COT to the second terminal device; the first resource is determined based on one or more of the following information, namely: whether the second terminal device is a terminal device within the communication cluster where the first terminal device is located, and the priority corresponding to the second terminal device A communication method.

21. The priority corresponding to the second terminal device is determined based on a first parameter, and the first parameter is related to one or more of the following information, namely, the sidelink corresponding to the second terminal device, the resources required by the second terminal device, the queue where the second terminal device is located, the waiting time of the second terminal device for resource allocation from the first terminal device, and the negative acknowledgment (NACK) fed back by the second terminal device to the first terminal device. The communication method according to claim 20.

22. The first COT sharing information includes second COT sharing information and third COT sharing information, the second COT sharing information corresponds to a first communication mode, and the third COT sharing information corresponds to a second communication mode. The communication method according to claim 20 or 21.

23. When the second terminal device is a terminal device within the communication cluster, the first resource is allocated based on a cluster priority method. The communication method according to any one of claims 20 to 22.

24. When the second terminal device is a terminal device outside the communication cluster, the first resource is determined based on the priority of the second terminal device. The communication method according to any one of claims 20 to 23.

25. A terminal device, wherein the terminal device is a first terminal device, Comprising a communication module configured to transmit a first sidelink channel to a second terminal device via a first sidelink, The first sidelink channel includes first channel occupancy time (COT) sharing information, and the first COT sharing information is as follows, that is, The first COT sharing information is carried in a first physical sidelink shared channel (PSSCH) of the first sidelink channel, The first COT sharing information includes second COT sharing information and third COT sharing information, the second COT sharing information corresponds to a first communication mode, and the third COT sharing information corresponds to a second communication mode A terminal device that satisfies one or more of the above.

26. The first sidelink channel further includes a first physical sidelink control channel (PSCCH), the first PSCCH includes first stage sidelink control information (SCI), and the time domain resource where the first COT sharing information and the first stage SCI are located is adjacent. The terminal device according to claim 25.

27. The last symbol where the first stage SCI is located is the first symbol, and the time domain resource where the first COT sharing information is located includes one symbol or two consecutive symbols following the first symbol. The terminal device according to claim 26.

28. The first sidelink channel further includes a first stage SCI and a second stage SCI, The time domain resources where the second COT sharing information and the first stage SCI are located are adjacent, and the time domain resources where the third COT sharing information and the second stage SCI are located are adjacent, or The terminal device according to claim 25, wherein the time domain resources where the third COT sharing information and the first stage SCI are located are adjacent, and the time domain resources where the second COT sharing information and the second stage SCI are located are adjacent.

29. The terminal device according to claim 28, wherein each of the second COT sharing information and the third COT sharing information occupies one symbol.

30. The first COT sharing information is the following information, namely COT start time, COT end time, COT duration, Unused resources within the COT, and Resources permitted to be used by a third terminal device participating in COT sharing The terminal device according to any one of claims 25 to 29, which is used to indicate one or more of them.

31. A terminal device, wherein the terminal device is a second terminal device, Comprising a communication module configured to receive a first sidelink channel transmitted by a first terminal device via a first sidelink, The first sidelink channel includes first channel occupancy time (COT) sharing information, and the first COT sharing information is the following, namely The first COT sharing information is carried in the first physical sidelink shared channel (PSSCH) of the first sidelink channel, and The first COT sharing information includes second COT sharing information and third COT sharing information, the second COT sharing information corresponds to a first communication mode, and the third COT sharing information corresponds to a second communication mode The terminal device that satisfies one or more of them.

32. The terminal device according to claim 31, wherein the first sidelink channel further includes a first physical sidelink control channel (PSCCH), the first PSCCH includes first stage sidelink control information (SCI), and the time domain resources where the first COT sharing information and the first stage SCI are located are adjacent.

33. The last symbol where the first stage SCI is located is the first symbol, and the time domain resource where the first COT sharing information is located includes one symbol following the first symbol or two consecutive symbols. The terminal device according to claim 32.

34. The first sidelink channel further includes a first stage SCI and a second stage SCI. The time domain resources where the second COT sharing information and the first stage SCI are located are adjacent, and the time domain resources where the third COT sharing information and the second stage SCI are located are adjacent, or The time domain resources where the third COT sharing information and the first stage SCI are located are adjacent, and the time domain resources where the second COT sharing information and the second stage SCI are located are adjacent. The terminal device according to claim 31.

35. The second COT sharing information and the third COT sharing information each occupy one symbol. The terminal device according to claim 34.

36. The first COT sharing information is the following information, that is, COT start time, COT end time, COT duration, Unused resources within the COT, and Resources permitted to be used by a third terminal device participating in COT sharing The terminal device according to any one of claims 31 to 35, which is used to indicate one or more of them.

37. A terminal device, wherein the terminal device is a first terminal device, Comprising a communication module configured to transmit a first sidelink channel, The first sidelink channel includes first channel occupancy time (COT) sharing information, and the first COT sharing information is used to indicate that the first terminal device has allocated the first resource within the COT to a second terminal device. The first resource is the following information, that is, Whether the second terminal device is a terminal device within the communication cluster where the first terminal device is located, and The priority corresponding to the second terminal device The terminal device determined based on one or more of them.

38. The priority corresponding to the second terminal device is determined based on a first parameter, the first parameter being one or more of the following information: a sidelink corresponding to the second terminal device, resources required by the second terminal device, a queue in which the second terminal device is located, a waiting time of the second terminal device for resource allocation from the first terminal device, and a negative acknowledgment (NACK) fed back from the second terminal device to the first terminal device. The terminal device according to claim 37.

39. The first COT sharing information includes second COT sharing information and third COT sharing information, the second COT sharing information corresponding to a first communication mode, and the third COT sharing information corresponding to a second communication mode. The terminal device according to claim 37 or 38.

40. When the second terminal device is a terminal device within the communication cluster, the first resource is allocated based on a cluster priority method. The terminal device according to any one of claims 37 to 39.

41. The communication module, When the number of NACKs fed back by the second terminal device is greater than a first threshold, the communication module is further configured to allocate a resource for retransmission from the resources within the COT to the second terminal device. The terminal device according to claim 40.

42. When the second terminal device is a terminal device outside the communication cluster, the first resource is determined based on the priority of the second terminal device. The terminal device according to any one of claims 37 to 41.

43. The communication module, When the number of NACKs fed back by the second terminal device is greater than a second threshold, the communication module is further configured to lower the priority of the second terminal device. The terminal device according to claim 42.

44. A terminal device, the terminal device being a second terminal device, comprising a communication module configured to receive a first sidelink channel. The first sidelink channel includes first channel occupancy time (COT) sharing information, and the first COT sharing information is used to indicate that a first terminal device has allocated first resources within the COT to the second terminal device. The first resource is based on one or more of the following information, namely, whether the second terminal device is a terminal device within the communication cluster where the first terminal device is located, and the priority corresponding to the second terminal device to determine a terminal device.

45. The priority corresponding to the second terminal device is determined based on a first parameter, and the first parameter is related to one or more of the following information, namely, the sidelink corresponding to the second terminal device, the resources required by the second terminal device, the queue where the second terminal device is located, the waiting time of the second terminal device for resource allocation from the first terminal device, and the negative acknowledgment (NACK) fed back by the second terminal device to the first terminal device. The terminal device according to claim 44.

46. The first COT sharing information includes second COT sharing information and third COT sharing information, where the second COT sharing information corresponds to a first communication mode and the third COT sharing information corresponds to a second communication mode. The terminal device according to claim 44 or 45.

47. When the second terminal device is a terminal device within the communication cluster, the first resource is allocated based on a cluster priority method. The terminal device according to any one of claims 44 to 46.

48. When the second terminal device is a terminal device outside the communication cluster, the first resource is determined based on the priority of the second terminal device. The terminal device according to any one of claims 44 to 47.

49. A communication device comprising a memory and a processor, the memory being configured to store a program, and the processor being configured to call the program in the memory to implement the method according to any one of claims 1 to 24.

50. An apparatus comprising a processor configured to call a program from a memory and implement the method according to any one of claims 1 to 24.

51. A chip comprising a processor configured to call a program from a memory and cause the device in which the chip is installed to implement the method according to any one of claims 1 to 24.

52. A computer-readable storage medium storing a program for causing a computer to implement the method according to any one of claims 1 to 24.

53. A computer program product including a program for causing a computer to implement the method according to any one of claims 1 to 24.

54. A computer program that causes a computer to implement the method according to any one of claims 1 to 24.

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