Channel access method, communication method, terminal and storage medium

Abstract

The invention relates to the technical field of communication, in particular to a channel access method, a communication method, a terminal and a storage medium, and the channel access method comprises the following steps: triggering a channel access process for a plurality of channels in an unlicensed frequency band based on first transmission of a direct link; and determining a multi-channel access mechanism for accessing the plurality of channels according to a second transmission after the first transmission. According to the invention, when the terminal needs the first transmission and then carries out the second transmission, the terminal can comprehensively consider the first transmission and the second transmission, thereby reasonably determining the multi-channel access mechanism for accessing a plurality of channels, and carrying out the multi-channel access based on the determined multi-channel access mechanism. And the technical problem that the multi-channel access delay is relatively large can be avoided as much as possible.

Description

Channel access method, communication method, terminal and storage medium Technical Field

[0001] The present disclosure relates to the field of communication technology, and in particular to a channel access method, a communication method, a terminal, a communication system, and a storage medium. Background Art

[0002] With the development of communication technology, terminals can communicate not only on licensed bands but also on unlicensed bands. Furthermore, terminal communication methods have expanded, for example, terminals can communicate via direct links (sidelinks). Furthermore, terminals can communicate via direct links on unlicensed bands, but channel access in this scenario presents some technical challenges.

[0003] Summary of the Invention

[0004] The embodiments of the present disclosure propose a channel access method, a communication method, a terminal, and a storage medium to solve technical problems in related technologies.

[0005] According to a first aspect of an embodiment of the present disclosure, a channel access method is proposed, which is executed by a first terminal. The method includes: triggering a channel access process for multiple channels in an unlicensed frequency band based on a first transmission in a direct link; and determining a multi-channel access mechanism for accessing the multiple channels based on a second transmission after the first transmission.

[0006] According to a second aspect of an embodiment of the present disclosure, a communication method is proposed, which is performed by a second terminal. The method includes: communicating with the first terminal described in the first aspect through a direct link on multiple channels in an unlicensed frequency band.

[0007] According to a third aspect of an embodiment of the present disclosure, a terminal is proposed, comprising: one or more processors; wherein the terminal is used to execute the channel access method described in the first aspect.

[0008] According to a fourth aspect of an embodiment of the present disclosure, a terminal is proposed, comprising: one or more processors; wherein the terminal is used to execute the communication method described in the second aspect.

[0009] According to the fifth aspect of an embodiment of the present disclosure, a communication system is proposed, comprising a first terminal and a second terminal, wherein the first terminal is configured to implement the channel access method described in the first aspect, and the second terminal is configured to implement the communication method described in the second aspect.

[0010] According to the sixth aspect of an embodiment of the present disclosure, a storage medium is proposed, which stores instructions. When the instructions are executed on a communication device, the communication device executes the channel access method described in the first aspect and / or the communication method described in the second aspect.

[0011] According to an embodiment of the present disclosure, when a terminal needs to perform a second transmission after a first transmission, the terminal can comprehensively consider the first transmission and the second transmission, so as to reasonably determine a multi-channel access mechanism for accessing multiple channels, and then perform multi-channel access based on the determined multi-channel access mechanism, which is conducive to avoiding the above-mentioned technical problem of large multi-channel access delay as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0013] FIG1 is a schematic diagram showing the architecture of a communication system according to an embodiment of the present disclosure.

[0014] FIG2 is an interactive schematic diagram showing a communication method according to an embodiment of the present disclosure.

[0015] FIG3 is a schematic diagram showing a multi-channel access scenario according to an embodiment of the present disclosure.

[0016] FIG4 is a schematic flowchart showing a channel access method according to an embodiment of the present disclosure.

[0017] FIG5 is a schematic diagram showing another multi-channel access scenario according to an embodiment of the present disclosure.

[0018] FIG6 is a schematic diagram showing another multi-channel access scenario according to an embodiment of the present disclosure.

[0019] FIG7 is a schematic block diagram of a terminal according to an embodiment of the present disclosure.

[0020] FIG8 is a schematic block diagram of a terminal according to an embodiment of the present disclosure.

[0021] FIG9A is a schematic structural diagram of a communication device proposed in an embodiment of the present disclosure.

[0022] FIG9B is a schematic diagram of the structure of the chip proposed in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0023] Embodiments of the present disclosure provide a channel access method, a communication method, a terminal, and a storage medium.

[0024] In a first aspect, an embodiment of the present disclosure proposes a channel access method, which is executed by a first terminal, and the method includes: triggering a channel access process for multiple channels in an unlicensed frequency band based on a first transmission in a direct link; and determining a multi-channel access mechanism for accessing the multiple channels based on a second transmission after the first transmission.

[0025] In the above embodiment, when the terminal needs to perform a second transmission after the first transmission, the terminal can comprehensively consider the first transmission and the second transmission, so as to reasonably determine the multi-channel access mechanism for accessing multiple channels, and then perform multi-channel access based on the determined multi-channel access mechanism, which is conducive to avoiding the above-mentioned technical problem of large multi-channel access delay as much as possible.

[0026] In combination with some embodiments of the first aspect, in some embodiments, the multi-channel access mechanism includes at least one of the following: a first multi-channel access mechanism; or a second multi-channel access mechanism.

[0027] In conjunction with some embodiments of the first aspect, in some embodiments, the first multi-channel access mechanism includes: a multi-channel access mechanism for direct link transmission.

[0028] In combination with some embodiments of the first aspect, in some embodiments, the second multi-channel access mechanism includes at least one of the following:

[0029] Type A1 multi-channel access mechanism for the physical direct link feedback channel;

[0030] Type A1 multi-channel access mechanism for direct link simultaneous broadcast blocks;

[0031] Type A2 multi-channel access mechanism for the physical direct link feedback channel;

[0032] Type A2 multi-channel access mechanism for direct link simultaneous broadcast blocks;

[0033] Type B1 multi-channel access mechanism for the physical direct link feedback channel;

[0034] Type B1 multi-channel access mechanism for direct link synchronization broadcast blocks;

[0035] Type B2 multi-channel access mechanism for the physical direct link feedback channel;

[0036] Type B2 multi-channel access mechanism for direct link synchronization broadcast blocks.

[0037] In combination with some embodiments of the first aspect, in some embodiments, the first transmission includes at least one of the following: a physical direct link feedback channel; and a direct link synchronization broadcast block.

[0038] In combination with some embodiments of the first aspect. In some embodiments, the method further includes: the first transmission includes a direct link synchronization broadcast block, determining a multi-channel access mechanism for accessing the multiple channels based on a second transmission after the first transmission, or determining that a first portion of channels in the multiple channels where the second transmission exists after the first transmission exists, and determining to repeatedly transmit the direct link synchronization broadcast block on the first portion of channels.

[0039] In combination with some embodiments of the first aspect, in some embodiments, the method further includes: determining that the multi-channel access mechanism for accessing the first part of channels includes the first multi-channel access mechanism.

[0040] In combination with some embodiments of the first aspect. In some embodiments, the method further includes: when performing repeated transmission of direct link synchronization broadcast blocks on the first part of the channels, the first part of the channels includes discontinuous channels, and the first terminal does not support repeated transmission of direct link synchronization broadcast blocks on discontinuous channels, determining to perform repeated transmission of direct link synchronization broadcast blocks on a channel between the discontinuous channels.

[0041] In conjunction with some embodiments of the first aspect, in some embodiments, the second transmission includes at least one of the following:

[0042] A physical direct link channel that occupies multiple channels;

[0043] A physical direct link channel occupies one channel.

[0044] In combination with some embodiments of the first aspect. In some embodiments, determining a multi-channel access mechanism for accessing the multiple channels based on a second transmission after a first transmission includes: determining a first portion of channels in the multiple channels where the second transmission exists after the first transmission; and determining a multi-channel access mechanism for accessing the first portion of channels based on the second transmission.

[0045] In combination with some embodiments of the first aspect. In some embodiments, determining a multi-channel access mechanism for accessing the first portion of channels based on the second transmission includes: the second transmission includes a physical direct link channel occupying multiple channels, and determining that the multi-channel access mechanism for accessing the first portion of channels is the first multi-channel access mechanism.

[0046] In combination with some embodiments of the first aspect. In some embodiments, determining a multi-channel access mechanism for accessing the first part of channels based on the second transmission includes: the second transmission includes a physical direct link channel occupying one channel, and determining that the multi-channel access mechanism for accessing the multiple channels is the second multi-channel access mechanism.

[0047] In combination with some embodiments of the first aspect. In some embodiments, the method further includes: determining a second portion of channels in the plurality of channels where the second transmission does not exist after the first transmission; and determining a multi-channel access mechanism for accessing the second portion of channels based on the number of channels in the second portion of channels.

[0048] In combination with some embodiments of the first aspect. In some embodiments, determining the multi-channel access mechanism for accessing the second part of channels based on the number of channels in the second part of channels includes: if the number of channels in the second part of channels is multiple, determining that the multi-channel access mechanism for accessing the second part of channels includes the second multi-channel access mechanism; wherein the method also includes: if the number of channels in the second part of channels is one, determining that the channel access mechanism for accessing the second part of channels includes a single-channel access mechanism.

[0049] In conjunction with some embodiments of the first aspect, in some embodiments, the method further comprises at least one of the following:

[0050] Successfully accessing the first part of the channels and transmitting on the first part of the channels;

[0051] The second part of the channels is successfully accessed and transmission is performed on the second part of the channels.

[0052] In combination with some embodiments of the first aspect, in some embodiments, the physical direct link channel includes at least one of the following: a physical direct link control channel; and a physical direct link shared channel.

[0053] In combination with some embodiments of the first aspect, in some embodiments, the second transmission includes at least one of the following: a second transmission sent by the first terminal; a second transmission sent by a second terminal other than the first terminal, wherein the first terminal and the second terminal share the multiple channels.

[0054] In combination with some embodiments of the first aspect, in some embodiments, the second transmission after the first transmission includes at least one of the following: a second transmission adjacent to the first transmission in the time domain; or a second transmission with a first interval in the time domain of the first transmission being less than an interval threshold.

[0055] In combination with some embodiments of the first aspect, in some embodiments, the method further comprises: when the first interval is greater than 16 microseconds, performing channel occupancy time recovery during the second transmission.

[0056] In a second aspect, an embodiment of the present disclosure proposes a communication method, which is executed by a second terminal, and the method includes: communicating with the first terminal described in any one of the first aspect and the optional embodiments of the first aspect through a direct link on multiple channels in an unlicensed frequency band.

[0057] In a third aspect, an embodiment of the present disclosure proposes a terminal, comprising: one or more processors; wherein the terminal is used to execute the channel access method described in any one of the first aspect and the optional embodiments of the first aspect.

[0058] In a fourth aspect, an embodiment of the present disclosure proposes a terminal, comprising: one or more processors; wherein the terminal is used to execute the communication method described in the second aspect.

[0059] In the fifth aspect, an embodiment of the present disclosure proposes a communication system, comprising a first terminal and a second terminal, wherein the first terminal is configured to implement the channel access method described in any one of the first aspect and the optional embodiments of the first aspect, and the second terminal is configured to implement the communication method described in the second aspect.

[0060] In the sixth aspect, an embodiment of the present disclosure proposes a storage medium, which stores instructions. When the instructions are executed on a communication device, the communication device executes the channel access method described in any one of the first aspect, the optional embodiments of the first aspect, and / or the communication method described in the second aspect.

[0061] In a seventh aspect, an embodiment of the present disclosure proposes a program product. When the program product is executed by a communication device, the communication device executes the method described in the first aspect, the second aspect, and any one of the optional embodiments of the first aspect.

[0062] In an eighth aspect, an embodiment of the present disclosure proposes a computer program, which, when executed on a computer, enables the computer to execute the method described in the first aspect, the second aspect, or any one of the optional embodiments of the first aspect.

[0063] It is understandable that the above-mentioned terminal, communication system, storage medium, program product, and computer program are all used to execute the method proposed in the embodiment of the present disclosure. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding method and will not be repeated here.

[0064] The present disclosure provides a channel access method, a communication method, a terminal, and a storage medium. In some embodiments, the terms "channel access method" and "information processing method" and "communication method" are interchangeable; the terms "terminal" and "information processing device" and "communication device" are interchangeable; and the terms "information processing system" and "communication system" are interchangeable.

[0065] The embodiments of the present disclosure are not exhaustive and are merely illustrative of some embodiments, and are not intended to be a specific limitation on the scope of protection of the present disclosure. In the absence of contradiction, each step in a certain embodiment can be implemented as an independent embodiment, and the steps can be arbitrarily combined. For example, a solution after removing some steps in a certain embodiment can also be implemented as an independent embodiment, and the order of the steps in a certain embodiment can be arbitrarily exchanged. In addition, the optional implementation methods in a certain embodiment can be arbitrarily combined; in addition, the embodiments can be arbitrarily combined. For example, some or all steps of different embodiments can be arbitrarily combined, and a certain embodiment can be arbitrarily combined with the optional implementation methods of other embodiments.

[0066] In each embodiment of the present disclosure, unless otherwise specified or provided for by logic, the terms and / or descriptions between the embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form a new embodiment based on their inherent logical relationships.

[0067] The terms used in the embodiments of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure.

[0068] In the embodiments of the present disclosure, unless otherwise specified, elements expressed in the singular form, such as "a", "an", "the", "above", "said", "aforementioned", "this", etc., may mean "one and only one", or "one or more", "at least one", etc.

[0069] For example, when using articles such as “a”, “an”, and “the” in English in translation, the noun following the article can be understood as a singular expression or a plural expression.

[0070] In the embodiments of the present disclosure, “plurality” refers to two or more.

[0071] In some embodiments, the terms "at least one," "one or more," "a plurality of," "multiple," etc. may be used interchangeably.

[0072] In some embodiments, descriptions such as "at least one of A and B," "A and / or B," "A in one case, B in another case," or "in response to one case A, in response to another case B" may include the following technical solutions depending on the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed); and in some embodiments, A and B (both A and B are executed). The above is also applicable when there are more branches such as A, B, and C.

[0073] In some embodiments, "A or B" and other descriptions may include the following technical solutions depending on the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed). The above is also applicable when there are more branches such as A, B, C, etc.

[0074] The prefixes such as "first" and "second" in the embodiments of the present disclosure are only used to distinguish different description objects and do not constitute any restrictions on the position, order, priority, quantity or content of the description objects. For the statement of the description objects, please refer to the description in the context of the claims or embodiments, and no unnecessary restrictions should be constituted due to the use of prefixes.

[0075] For example, if the description object is "field," the ordinal number preceding "field" in "first field" and "second field" does not restrict the position or order of the "fields." "First" and "second" do not restrict whether the modified "fields" are in the same message, nor do they restrict the order of the "first field" and "second field." For another example, if the description object is "level," the ordinal number preceding "level" in "first level" and "second level" does not restrict the priority of the "levels." For another example, the number of description objects is not restricted by the ordinal number and can be one or more. For example, in the case of "first device," the number of "devices" can be one or more. Furthermore, the objects modified by different prefixes can be the same or different. For example, if the description object is "device," "first device" and "second device" can be the same device or different devices, and their types can be the same or different. For another example, if the description object is "information," "first transmission" and "second transmission" can be the same information or different information, and their content can be the same or different.

[0076] In some embodiments, “including A,” “comprising A,” “used to indicate A,” and “carrying A” can be interpreted as directly carrying A or indirectly indicating A.

[0077] In some embodiments, terms such as "in response to...", "in response to determining...", "in the case of...", "at the time of...", "when...", "if...", "if...", etc. can be used interchangeably.

[0078] In some embodiments, terms such as "greater than", "greater than or equal to", "not less than", "more than", "more than or equal to", "not less than", "higher than", "higher than or equal to", "not less than", and "above" can be replaced with each other, and terms such as "less than", "less than or equal to", "not greater than", "less than", "less than or equal to", "not more than", "lower than", "lower than or equal to", "not higher than", and "below" can be replaced with each other.

[0079] In some embodiments, devices, etc. can be interpreted as physical or virtual, and their names are not limited to the names recorded in the embodiments. Terms such as "device", "equipment", "device", "circuit", "network element", "node", "function", "unit", "section", "system", "network", "chip", "chip system", "entity", and "subject" can be used interchangeably.

[0080] In some embodiments, "network" can be interpreted as devices included in the network (eg, access network equipment, core network equipment, etc.).

[0081] In some embodiments, the terms "access network device (AN device)", "radio access network device (RAN device)", "base station (BS)", "radio base station" "fixed station", "node", "access point", "transmission point (TP)", "reception point (RP)", "transmission / reception point (TRP)", "panel", "antenna panel", "antenna array", "cell", "macro cell", "small cell", "femto cell", "pico cell", "sector", "cell group", "serving cell", "carrier", "component carrier", "bandwidth part (BWP)" and the like may be used interchangeably.

[0082] In some embodiments, the terms "terminal", "terminal device", "user equipment (UE)", "user terminal", "mobile station (MS)", "mobile terminal (MT)", subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, etc. can be used interchangeably.

[0083] In some embodiments, the access network device, the core network device, or the network device can be replaced by a terminal. For example, the various embodiments of the present disclosure can also be applied to a structure in which the communication between the access network device, the core network device, or the network device and the terminal is replaced by communication between multiple terminals (for example, device-to-device (D2D), vehicle-to-everything (V2X), etc.). In this case, it is also possible to set the structure in which the terminal has all or part of the functions of the access network device. In addition, terms such as "uplink" and "downlink" can also be replaced by terms corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. can be replaced by side channels, and uplinks, downlinks, etc. can be replaced by side links.

[0084] In some embodiments, the terminal may be replaced by an access network device, a core network device, or a network device. In this case, the access network device, the core network device, or the network device may have a structure that has all or part of the functions of the terminal.

[0085] In some embodiments, obtaining data, information, etc. may comply with the laws and regulations of the country where the data is obtained.

[0086] In some embodiments, data, information, etc. may be obtained with the user's consent.

[0087] In addition, each element, each row, or each column in the table of the embodiment of the present disclosure can be implemented as an independent embodiment, and the combination of any elements, any rows, and any columns can also be implemented as an independent embodiment.

[0088] FIG1 is a schematic diagram showing the architecture of a communication system according to an embodiment of the present disclosure.

[0089] As shown in Figure 1, the communication system 100 includes a first terminal 101 and a second terminal 102, wherein the first terminal and the second terminal can communicate through a direct link. Further, the first terminal and the second terminal can communicate through a direct link on one or more channels in an unlicensed frequency band.

[0090] In some embodiments, the first terminal and the second terminal may also communicate with a network device. For example, the network device includes at least one of the following: an access network device and a core network device.

[0091] In some embodiments, the first terminal 101 and the second terminal 102 include, for example, a mobile phone, a wearable device, an Internet of Things device, a car with communication function, a smart car, a tablet computer, a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical surgery, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, and at least one of a wireless terminal device in a smart home, but are not limited thereto.

[0092] In some embodiments, the access network device is, for example, a node or device that accesses a terminal to a wireless network. The access network device may include an evolved NodeB (eNB), a next generation evolved NodeB (ng-eNB), a next generation NodeB (gNB), a node B (NB), a home node B (HNB), a home evolved nodeB (HeNB), a wireless backhaul device, a radio network controller (RNC), a base station controller (BSC), a base transceiver station (BTS), a base band unit (BBU), a mobile switching center, a base station in a 6G communication system, an open base station (Open RAN), a cloud base station (Cloud RAN), a base station in other communication systems, and at least one of an access node in a Wi-Fi system, but is not limited thereto.

[0093] In some embodiments, a core network device may be a device including one or more network elements, or may be multiple devices or device groups, each including all or part of the one or more network elements. The network element may be virtual or physical. The core network may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), and a Next Generation Core (NGC).

[0094] In some embodiments, the technical solution of the present disclosure can be applied to the Open RAN architecture. In this case, the interfaces between or within the access network devices involved in the embodiments of the present disclosure can be transformed into internal interfaces of the Open RAN, and the processes and information interactions between these internal interfaces can be implemented through software or programs.

[0095] In some embodiments, the access network device can be composed of a centralized unit (CU) and a distributed unit (DU), where the CU can also be called a control unit. The CU-DU structure can be used to split the protocol layer of the access network device, with the functions of some protocol layers centrally controlled by the CU, and the functions of the remaining part or all of the protocol layers distributed in the DU, which is centrally controlled by the CU, but is not limited to this.

[0096] It can be understood that the communication system described in the embodiment of the present disclosure is for the purpose of more clearly illustrating the technical solution of the embodiment of the present disclosure, and does not constitute a limitation on the technical solution proposed in the embodiment of the present disclosure. Ordinary technicians in this field can know that with the evolution of the system architecture and the emergence of new business scenarios, the technical solution proposed in the embodiment of the present disclosure is also applicable to similar technical problems.

[0097] The following embodiments of the present disclosure may be applied to the communication system 100 shown in FIG1 , or a portion thereof, but are not limited thereto. The entities shown in FIG1 are illustrative only. The communication system may include all or part of the entities shown in FIG1 , or may include other entities outside of FIG1 . The number and form of the entities are arbitrary, and the entities may be physical or virtual. The connection relationships between the entities are illustrative only. The entities may be connected or disconnected, and the connection may be in any manner, including direct or indirect, wired or wireless.

[0098] The embodiments of the present disclosure can be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 5G new radio (NR), future radio access (FRA), new radio access technology (RAT), new radio (NR), new radio access (NX), future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), Public Land Mobile Network (PLMN) networks, Device-to-Device (D2D) systems, Machine-to-Machine (M2M) systems, Internet of Things (IoT) systems, Vehicle-to-Everything (V2X), systems utilizing other communication methods, and next-generation systems based on and extending these methods. Furthermore, multiple systems may be combined (for example, a combination of LTE or LTE-A with 5G).

[0099] FIG2 is an interactive schematic diagram showing a communication method according to an embodiment of the present disclosure.

[0100] As shown in FIG2 , the communication method includes:

[0101] Step S201: A first terminal accesses multiple channels through a multi-channel access mechanism.

[0102] In some embodiments, the plurality of channels are a plurality of channels in an unlicensed frequency band.

[0103] In some embodiments, the channel access process to the plurality of channels is triggered based on a first transmission by the first terminal on the direct link.

[0104] In some embodiments, the multi-channel access mechanism includes at least one of the following: a first multi-channel access mechanism; a second multi-channel access mechanism.

[0105] In some embodiments, the first multi-channel access mechanism includes: a multi-channel access mechanism for direct link transmission.

[0106] In some embodiments, the second multi-channel access mechanism includes at least one of the following:

[0107] Type A1 multi-channel access mechanism for the physical direct link feedback channel;

[0108] Type A1 multi-channel access mechanism for direct link simultaneous broadcast blocks;

[0109] Type A2 multi-channel access mechanism for the physical direct link feedback channel;

[0110] Type A2 multi-channel access mechanism for direct link simultaneous broadcast blocks;

[0111] Type B1 multi-channel access mechanism for the physical direct link feedback channel;

[0112] Type B1 multi-channel access mechanism for direct link synchronization broadcast blocks;

[0113] Type B2 multi-channel access mechanism for the physical direct link feedback channel;

[0114] Type B2 multi-channel access mechanism for direct link synchronization broadcast blocks.

[0115] In some embodiments, the first transmission includes at least one of: a physical direct link feedback channel; and a direct link synchronization broadcast block.

[0116] In some embodiments, when the first transmission includes a direct link synchronization broadcast block, the first terminal determines a multi-channel access mechanism for accessing the plurality of channels according to a second transmission subsequent to the first transmission.

[0117] In some embodiments, upon determining that a first portion of channels for the second transmission exists after the first transmission in the plurality of channels, the first terminal determines to repeatedly transmit the direct link synchronization broadcast block in the first portion of channels.

[0118] In some embodiments, the multi-channel access mechanism determined by the first terminal for accessing the first portion of channels includes the first multi-channel access mechanism.

[0119] In some embodiments, when direct link synchronization broadcast block repetition transmission is performed on the first part of the channel, the first part of the channel includes discontinuous channels, and the first terminal does not support direct link synchronization broadcast block repetition transmission on discontinuous channels, the first terminal determines to perform direct link synchronization broadcast block repetition transmission on the channel between the discontinuous channels.

[0120] In some embodiments, the second transmission includes at least one of the following:

[0121] A physical direct link channel that occupies multiple channels;

[0122] A physical direct link channel occupies one channel.

[0123] In some embodiments, the first terminal determines that a first portion of channels of the plurality of channels has the second transmission after the first transmission; and determines a multi-channel access mechanism for accessing the first portion of channels based on the second transmission.

[0124] In some embodiments, when the second transmission includes a physical direct link channel occupying multiple channels, the first terminal determines that the multi-channel access mechanism used to access the first part of the channels is the first multi-channel access mechanism.

[0125] In some embodiments, when the second transmission includes a physical direct link channel occupying one channel, the first terminal determines that the multi-channel access mechanism used to access the multiple channels is the second multi-channel access mechanism.

[0126] In some embodiments, the first terminal determines that a second portion of channels in the plurality of channels does not exist for the second transmission after the first transmission; and determines a multi-channel access mechanism for accessing the second portion of channels based on the number of channels in the second portion of channels.

[0127] In some embodiments, when the number of channels in the second part of channels is plural, the first terminal determines that a multi-channel access mechanism for accessing the second part of channels includes the second multi-channel access mechanism.

[0128] In some embodiments, when the number of channels in the second portion of channels is one, the first terminal determines that the channel access mechanism for accessing the second portion of channels includes a single channel access mechanism.

[0129] In some embodiments, the method further comprises at least one of the following:

[0130] Successfully accessing the first part of the channels and transmitting on the first part of the channels;

[0131] The second part of the channels is successfully accessed and transmission is performed on the second part of the channels.

[0132] In some embodiments, the physical direct link channel includes at least one of the following:

[0133] Physical direct link control channel;

[0134] Physical direct links share the channel.

[0135] In some embodiments, the second transmission includes at least one of the following:

[0136] a second transmission sent by the first terminal;

[0137] A second transmission is sent by a second terminal other than the first terminal, wherein the first terminal shares the plurality of channels with the second terminal.

[0138] In some embodiments, the second transmission after the first transmission includes at least one of the following:

[0139] a second transmission adjacent to the first transmission in the time domain;

[0140] A second transmission having a first time interval smaller than a time interval threshold from the first transmission in the time domain.

[0141] In some embodiments, when the first interval is greater than 16 microseconds, the first terminal performs channel occupancy time recovery when performing the second transmission.

[0142] Step S202: The first terminal communicates with the second terminal via a direct link on the multiple accessed channels.

[0143] The communication method involved in the embodiment of the present disclosure may include at least one of steps S201 to S202. For example, step S201 may be implemented as an independent embodiment, and step S202 may be implemented as an independent embodiment, but the present invention is not limited thereto.

[0144] In some embodiments, steps S201 and S202 may be performed in an interchangeable order or simultaneously.

[0145] In some embodiments, step S201 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0146] In some embodiments, step S202 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0147] In some embodiments, reference may be made to other optional implementations described before or after the description corresponding to FIG. 2 .

[0148] In some embodiments, terminals can communicate with each other via a direct link (SL) in an unlicensed frequency band. For example, a first terminal can communicate with a second terminal via a direct link in an unlicensed frequency band, which can be referred to as SL-U (sidelink Unlicensed).

[0149] Before accessing a channel in an unlicensed frequency band, a terminal needs to monitor the channel to determine whether it is idle. The monitoring method includes but is not limited to Listen Before Talk (LBT). Only when the channel is idle can the terminal access the channel for communication.

[0150] In some embodiments, one channel may correspond to one resource block set (RB (Resource Block) set), and multiple channels may correspond to multiple resource block sets.

[0151] In some embodiments, when performing some transmissions, the terminal needs to occupy multiple channels in the unlicensed frequency band, and the multi-channel access mechanism may include a first multi-channel access mechanism and a second multi-channel access mechanism.

[0152] Among them, multi-channel access is performed based on the first multi-channel access mechanism, and the terminal monitors multiple channels. Only when it is determined that multiple channels are idle can the terminal access multiple channels and transmit on multiple channels. Otherwise, when any of the multiple channels is not idle (that is, busy), the terminal cannot access multiple channels and needs to continue to monitor these multiple channels. In addition, with respect to the communication between the base station and the terminal in the wireless network, the base station and the terminal can communicate in an unlicensed frequency band (for example, NR-U (New Radio Unlicensed)), and the above-mentioned first multi-channel mechanism is used for the transmission of multiple channels occupied in the uplink transmission.

[0153] Based on the second multi-channel access mechanism, the terminal monitors multiple channels. When it is determined that some of the multiple channels are idle, the terminal can access some of the idle channels and transmit on the accessed channels, without having to access the channels when multiple channels are idle. In addition, regarding the communication between the base station and the terminal in the wireless network, the base station and the terminal can communicate in an unlicensed frequency band (such as NR-U (New Radio Unlicensed)), and the above-mentioned second multi-channel mechanism is used for transmission that occupies multiple channels in downlink transmission.

[0154] It can be seen that compared with the first multi-channel access mechanism, the access conditions of the second multi-channel access mechanism are more relaxed. That is, compared with multi-channel access through the first multi-channel access mechanism, the terminal can more easily access the channel through the second multi-channel access mechanism to ensure that communication operations are carried out in a timely manner.

[0155] In some embodiments, the terminal needs to occupy multiple channels in the unlicensed frequency band for direct link transmission, including at least one of the following:

[0156] Transmitting the Physical Sidelink Control Channel (PSCCH) on multiple channels;

[0157] Transmitting the Physical Sidelink Shared Channel (PSSCH) on multiple channels;

[0158] Transmitting the Physical Sidelink Feedback Channel (PSFCH) on multiple channels;

[0159] The direct link synchronization broadcast block (Sidelink Synchronization Signal / PBCH (Physical Broadcast Channel) Block, S-SSB) is transmitted on multiple channels.

[0160] In some embodiments, for PSCCH and PSSCH transmissions, a single transmission may occupy multiple channels.

[0161] In some embodiments, for PSFCH transmission, multiple PSFCHs may occupy multiple channels, and one PSFCH corresponds to one physical direct link transmission, and is used to transmit feedback information for the physical direct link, such as feedback on whether the physical direct link transmission is successfully received.

[0162] In some embodiments, for S-SSB transmission, the terminal may perform repeated transmission (repetition) of S-SSB on multiple channels. For example, the purpose of performing repeated transmission of S-SSB includes but is not limited to occupying multiple channels.

[0163] In some embodiments, for PSCCH and PSSCH transmissions, when multiple channels need to be occupied, the terminal can use the first multi-channel access mechanism for multi-channel access. Taking PSSCH transmission as an example, since the terminal can access multiple channels required for PSSCH when performing multi-channel access based on the first multi-channel access mechanism, smooth PSSCH transmission can be ensured.

[0164] In some embodiments, for PSFCH and S-SSB transmissions, when multiple channels need to be occupied, the terminal may use a second multi-channel access mechanism for multi-channel access. Taking S-SSB transmission as an example, since multi-channel access is performed based on the second multi-channel access mechanism, the terminal only needs to access some channels for S-SSB repeated transmission when some channels are idle, which is conducive to ensuring that S-SSB repeated transmission is carried out in a timely manner.

[0165] However, in some embodiments, when the terminal performs multi-channel access in an unlicensed frequency band, it needs to first transmit one of PSFCH and S-SSB, and then transmit at least one of PSCCH and PSSCH. In this case, the channel required for the first direct link transmission and the channel required for the subsequent direct link transmission may be different, so there will be some technical problems in determining the multi-channel access mechanism.

[0166] FIG3 is a schematic diagram showing a multi-channel access scenario according to an embodiment of the present disclosure.

[0167] As shown in FIG3 , a case where a terminal first performs direct link transmission on multiple channels in an unlicensed frequency band including S-SSB repeated transmission and then performs direct link transmission including PSSCH is taken as an example.

[0168] The terminal's first repeated S-SSB transmission needs to occupy three channels: CH#1, CH#2, and CH#3; the subsequent PSSCH transmission only needs to occupy two channels: CH#1 and CH#2. In this case, if multi-channel access is performed for these three channels according to the first multi-channel access mechanism, it is necessary to determine through monitoring that all three channels are idle. The terminal can only access the three channels for transmission at the same time when all three channels are idle. However, compared with the second multi-channel access mechanism, since the access conditions of the first multi-channel access mechanism are more stringent, it is easy for the access conditions of the first multi-channel access mechanism to be not met. If it is necessary to continue monitoring these multiple channels, it will lead to a technical problem of large multi-channel access delay.

[0169] In a first aspect, embodiments of the present disclosure provide a channel access method. Figure 4 is a schematic flow chart illustrating a channel access method according to an embodiment of the present disclosure. The channel access method illustrated in this embodiment may be executed by a first terminal.

[0170] As shown in FIG4 , the channel access method may include the following steps:

[0171] In step S401, a channel access process to multiple channels in an unlicensed frequency band is triggered based on a first transmission on a direct link;

[0172] In step S402, a multi-channel access mechanism for accessing multiple channels is determined according to a second transmission subsequent to the first transmission.

[0173] It should be noted that the embodiment shown in FIG. 4 can be implemented independently or in combination with at least one other embodiment in the present disclosure. The specific selection can be made as needed and the present disclosure does not limit it.

[0174] In some embodiments, when a terminal needs to perform a first transmission via a direct link in an unlicensed frequency band, a channel access process to multiple channels in the unlicensed frequency band may be triggered. In order to perform multi-channel access, a multi-channel access mechanism needs to be determined first.

[0175] According to an embodiment of the present disclosure, when a terminal needs to perform a second transmission after a first transmission, the terminal can comprehensively consider the first transmission and the second transmission, so as to reasonably determine a multi-channel access mechanism for accessing multiple channels, and then perform multi-channel access based on the determined multi-channel access mechanism, which is conducive to avoiding the above-mentioned technical problem of large multi-channel access delay as much as possible.

[0176] It should be noted that, based on the embodiment shown in FIG3 , one of the reasons why selecting a multi-channel access mechanism may be problematic is that the number of channels occupied by the first transmission is different from the number of channels occupied by the subsequent second transmission. Therefore, in some embodiments, before executing the steps in the embodiments of the present disclosure, it is possible to first determine whether the number of channels occupied by the first transmission is the same as the number of channels occupied by the subsequent second transmission. If they are different, the steps in the embodiments of the present disclosure are executed. If they are the same, the steps in the embodiments of the present disclosure may not be executed, and instead multi-channel access may be performed according to the first multi-channel access mechanism.

[0177] In some embodiments, the multi-channel access mechanism includes at least one of the following:

[0178] First multi-channel access mechanism;

[0179] Second multi-channel access mechanism.

[0180] Among them, in some embodiments, multi-channel access is performed based on the first multi-channel access mechanism. The terminal monitors multiple channels and determines that multiple channels are idle before the terminal accesses multiple channels and transmits on multiple channels. Otherwise, if any channel among the multiple channels is not idle (that is, busy), the terminal cannot access multiple channels and needs to continue to monitor these multiple channels.

[0181] In some embodiments, based on the second multi-channel access mechanism, the terminal monitors multiple channels. When it is determined that some of the multiple channels are idle, the terminal can access the idle channels and transmit on the accessed channels, without having to access the channels only when multiple channels are idle.

[0182] In some embodiments, the first multi-channel access mechanism includes: a multi-channel access mechanism for SL transmissions.

[0183] In some embodiments, the multi-channel access mechanism for direct link transmission may be applied to at least one of the following: PSCCH, PSSCH, S-SSB, PSFCH.

[0184] In some embodiments, based on a multi-channel access mechanism for direct link transmission, a terminal may perform multi-channel access and perform direct link transmission on multiple accessed channels.

[0185] For example, the multiple channels that a terminal needs to access are called a channel set C. The following is an exemplary description of the specific content of the multi-channel access mechanism for direct link transmission:

[0186] When a terminal needs to perform direct link transmission on channel set C, the following applies:

[0187] - If the Type 1 channel access procedure is used for direct link transmission on channel set C,

[0188] - The terminal can use the type 2A channel access mechanism described in Section 4.5.2.1 to access channel c in channel set C. i Transmission is performed on

[0189] - if the channel frequencies of channel set C are a subset of the channel frequency set defined in section [2X] XX, and

[0190] - If the terminal is on channel c in channel set C j (j is not equal to i) before the transmission on channel c i The send on was executed before, and

[0191] - If the terminal has accessed channel c using the Type 1 channel access mechanism described in Section 4.5.1 j ,

[0192] - wherein, before performing a type 1 channel access procedure on any channel in the channel set C, the terminal uniformly randomly selects a channel c from the channel set C j ,

[0193] - The terminal can use the type 1 channel access mechanism to access the channel c i Transmission is performed on

[0194] - If the terminal fails to access any channel in the carrier bandwidth, the terminal may access a channel that is not in the carrier bandwidth i The terminal is scheduled or configured with direct link resources on the carrier bandwidth.

[0195] It should be noted that the chapters described in the embodiments of the present disclosure refer to the chapters described in 3GPP (3rd Generation Partnership Project) TS 37.213 V18.0.0, which will not be described in detail here.

[0196] In some embodiments, the second multi-channel access mechanism includes at least one of the following:

[0197] Type A1 multi-channel access mechanism for the physical direct link feedback channel;

[0198] Type A1 multi-channel access mechanism for direct link simultaneous broadcast blocks;

[0199] Type A2 multi-channel access mechanism for the physical direct link feedback channel;

[0200] Type A2 multi-channel access mechanism for direct link simultaneous broadcast blocks;

[0201] Type B1 multi-channel access mechanism for the physical direct link feedback channel;

[0202] Type B1 multi-channel access mechanism for direct link synchronization broadcast blocks;

[0203] Type B2 multi-channel access mechanism for the physical direct link feedback channel;

[0204] Type B2 multi-channel access mechanism for direct link synchronization broadcast blocks.

[0205] For the convenience of description, PSFCH and S-SSB are collectively referred to as the first transmission below. The following is an exemplary description of the type A multi-channel access mechanism:

[0206] According to the process described in this section, the terminal can access multiple channels that perform only the first transmission.

[0207] The terminal can use the procedure described in Section 4.5.1 to configure each channel c in C. i Channel access is performed on , where C is the set of channels on which the terminal intends to transmit, i = 0, 1, ..., q-1, and q is the number of channels on which the terminal intends to transmit.

[0208] The counter N described in Section 4.5.1 is for each channel c i Determined and expressed as N Ci , N Ci Maintained based on Section 4.5.6.1.1 or 4.5.6.1.2.

[0209] In order to determine the channel c i The CW p , used in the process described in Section 4.5.4 with channel c i Any PSSCH that is fully or partially overlapped. CW refers to the contention window.

[0210] The following is an exemplary description of the type A1 multi-channel access mechanism:

[0211] The counter N described in Section 4.5.1 is for each channel c i Independently determined and denoted as N Ci .

[0212] If the absence of any other technology sharing the channel cannot be guaranteed in the long term (e.g. by adjusting the level), when the terminal stops on any channel c in C j When transmitting, for each channel c i , while waiting for 4T sl After the duration or after reinitialization N Ci When an idle sensing time slot is detected, the terminal can resume decreasing N Ci , used to perform channel access procedures respectively.

[0213] The following is an exemplary description of the type A2 multi-channel access mechanism:

[0214] The counter N is based on the value of c in C in Section 4.5.1. j The description is determined and expressed as N Cj , where c j Is the maximum CW p The value of the channel, for each channel c i , N Ci=N Cj .

[0215] When the terminal determines N Ci When the first transmission is stopped on any channel, the terminal shall reinitialize N for all channels separately. Ci .

[0216] The following is an exemplary description of the Type A multi-channel access mechanism:

[0217] According to the process described in this section, the terminal can access multiple channels that perform only the first transmission.

[0218] The terminal selects channel c in C based on at least one of the following methods: j :

[0219] -Terminals through multiple channels c in C i Before each transmission on j ;

[0220] -Terminal select c j The frequency does not exceed once every 1 second

[0221] Where C is the set of channels on which the terminal intends to transmit, i = 0, 1, ..., q-1, and q is the number of channels on which the terminal intends to make the first transmission.

[0222] For channel c j For transmissions on channel c, the terminal shall follow the procedure described in Section 4.5.1 with the modifications described in Section 4.5.6.2.1 or 4.5.6.2.2. j Channel access is performed on the UE so as to access the channel to perform the first transmission.

[0223] For channel c i For each channel c i , the terminal should be in channel c j Before transmitting, at least sense channel c i A sensing interval T mc = 25 microseconds, and the terminal can sense channel c i Idle sensing interval at least T mc Immediately afterwards, on channel c i For accessing the channel to perform the first transmission. mc Middle pair channel c j If the channel c is sensed as idle during all the durations during which such idle sensing is performed, then i Considered as idle time T mc .

[0224] The terminal cannot be in channel c i (i is not equal to j) Transmission exceeds T given in Table 4.5-1 m cot，p The time period, where T m cot，p The value is used for channel c j The channel access parameter is determined by the channel access parameter for accessing the channel to perform the first transmission.

[0225] For the procedures in this section, the channels of the channel set C selected by the terminal for the first transmission are a subset of the RB set in the (pre-)configured sidelink resource pool.

[0226] The following is an exemplary description of the type B1 multi-channel access mechanism:

[0227] A separate CW p The value is maintained for channel set C.

[0228] In order to determine the channel c i The CW p , used in the process described in Section 4.5.4 with channel c i fully or partially overlap any PSSCH.

[0229] The following is an exemplary description of the type B2 multi-channel access mechanism:

[0230] A CW p The value is maintained independently for each channel c using the procedure described in Section 4.5.4 i .

[0231] In order to determine the channel c i The CW p , used in the process described in Section 4.5.4 with channel c i fully or partially overlap any PSSCH.

[0232] In order to determine the channel c j Ninit (that is, the initial N value) can be obtained by using channel c in C. j1 The CW p Value, where c j1 is the channel set C with the largest CW p value channel.

[0233] In some embodiments, the first transmission includes at least one of the following:

[0234] Physical direct link feedback channel PSFCH;

[0235] Direct link synchronization broadcast block S-SSB.

[0236] In some embodiments, when the terminal needs to perform PSFCH transmission on multiple channels in an unlicensed frequency band, a multi-channel access process can be triggered, wherein, for PSFCH transmission, multiple PSFCHs can occupy multiple channels, and one PSFCH corresponds to one direct link transmission, which is used to transmit feedback information for the direct link, such as feedback on whether the physical direct link transmission is successfully received.

[0237] In some embodiments, when the terminal needs to perform S-SSB transmission on multiple channels in an unlicensed frequency band, a multi-channel access process can be triggered, wherein, for S-SSB transmission, the terminal can perform repeated transmission (repetition) of S-SSB on multiple channels. For example, the purpose of repeated transmission of S-SSB includes but is not limited to occupying multiple channels.

[0238] In some embodiments, the channel access method also includes: the first transmission includes a direct link synchronization broadcast block, and a multi-channel access mechanism for accessing multiple channels is determined based on a second transmission after the first transmission, or, a first part of channels in multiple channels is determined in which a second transmission exists after the first transmission, and it is determined that the direct link synchronization broadcast block is repeatedly transmitted in the first part of the channels.

[0239] In some embodiments, the channel access method further includes: determining that the multi-channel access mechanism used to access the first part of the channels includes a first multi-channel access mechanism.

[0240] Based on the embodiment shown in FIG3 , it can be seen that one of the reasons why there is a problem with selecting the multi-channel access mechanism is that the number of channels occupied by the first transmission is different from the number of channels occupied by the subsequent second transmission.

[0241] When the first transmission includes S-SSB, the terminal may trigger a multi-channel access procedure when it needs to repeatedly transmit S-SSB on multiple channels in the unlicensed frequency band. In this case, since S-SSB is repeatedly transmitted and the transmission process is controllable by the terminal, the terminal can choose one of two operation modes.

[0242] Method 1: The terminal can determine that there is a first part of the channel for the second transmission after the first transmission in multiple channels, and adjust to perform repeated transmission of S-SSB on the first part of the channel. In this case, the first transmission is performed on the first part of the channel, and the second transmission is also performed on the first part of the channel, so the number of channels occupied by the first transmission is the same as the number of channels occupied by the subsequent second transmission. Then, there is no need to select a multi-channel access mechanism based on the second transmission, but multi-channel access can be performed directly based on the first multi-channel access mechanism.

[0243] FIG5 is a schematic diagram showing another multi-channel access scenario according to an embodiment of the present disclosure.

[0244] For example, based on the embodiment shown in Figure 3, the second transmission includes PSSCH. S-SSB repeated transmission requires occupying three channels: CH#1, CH#2, and CH#3; the subsequent PSSCH transmission only requires occupying two channels: CH#1 and CH#2.

[0245] Based on the first method described above, the terminal can determine that the first part of the channels is CH#1 and CH#2. Then, as shown in Figure 5, the terminal can adjust to repeatedly transmit the S-SSB on CH#1 and CH#2. That is, the terminal repeatedly transmits the S-SSB on CH#1 and CH#2, and then transmits the PSSCH. And because the channels required for transmitting the S-SSB and the PSSCH are both CH#1 and CH#2, the terminal can access CH#1 and CH#2 based on the first multi-channel access mechanism.

[0246] Method 2: The terminal may not adjust the channel where the S-SSB is repeatedly transmitted, and still based on the embodiment shown in Figure 4, determine the multi-channel access mechanism for accessing multiple channels according to the second transmission after the first transmission.

[0247] In some embodiments, the channel access method further includes: when performing repeated transmission of direct link synchronization broadcast blocks on a first part of the channel, the first part of the channel includes non-contiguous channels, and the first terminal does not support repeated transmission of direct link synchronization broadcast blocks on non-contiguous channels, determining to perform repeated transmission of direct link synchronization broadcast blocks on a channel between the non-contiguous channels.

[0248] When the first terminal repeatedly transmits the S-SSB on multiple channels in the unlicensed frequency band, if the first terminal does not support repeated transmission of the S-SSB on discontinuous channels, the channels occupied by the S-SSB need to remain continuous in the frequency domain. However, when the first terminal attempts to perform the operation according to the above-mentioned method 1, but the channels in the determined first part of channels are discontinuous, in order to ensure that the capabilities of the first terminal are met, repeated transmission of the S-SSB is still required on the channels between the discontinuous channels, thereby ensuring that the channels occupied by the S-SSB are continuous in the frequency domain.

[0249] Among them, when the number of channels occupied by the first transmission is different from the number of channels occupied by the subsequent second transmission due to repeated transmission of S-SSB on channels between discontinuous channels, the operation can be performed according to the above-mentioned method 2.

[0250] It should be noted that, when the result of performing the operation based on the above-mentioned method 2 is that some channels used for the first transmission (such as S-SSB, PSFCH, etc.) in multiple channels are still discontinuous, and the first terminal does not support the first transmission on discontinuous channels, then the first terminal may not perform the first transmission, or the first terminal may give up the first transmission on one or more channels to ensure that the channels used to transmit the first transmission are continuous.

[0251] In some embodiments, the second transmission includes at least one of the following:

[0252] A physical direct link channel that occupies multiple channels;

[0253] A physical direct link channel occupies one channel.

[0254] In some embodiments, the physical direct link channel includes at least one of the following:

[0255] Physical direct link control channel PSCCH;

[0256] Physical direct link shared channel PSSCH.

[0257] In some embodiments, the channel access process to multiple channels in the unlicensed frequency band is triggered based on the first transmission in the direct link, including: the terminal performs a first transmission (for example, transmitting PSFCH and / or S-SSB) on n channels in the unlicensed frequency band through a direct link to trigger the channel access process to n channels.

[0258] A multi-channel access mechanism for accessing multiple channels is determined based on a second transmission after a first transmission, including: if a second transmission is required on m channels out of n channels after the first transmission (for example, transmitting PSCCH and / or PSSCH), then the terminal can select a multi-channel access mechanism for accessing n channels based on the situation of PSCCH and / or PSSCH, where m and n are integers, m<n, and m is greater than or equal to 1.

[0259] In some embodiments, a multi-channel access mechanism for accessing multiple channels is determined based on a second transmission after a first transmission, including: determining a first portion of channels in a plurality of channels where a second transmission exists after the first transmission; and determining a multi-channel access mechanism for accessing the first portion of channels based on the second transmission.

[0260] In some embodiments, for a second transmission that needs to be performed after a first transmission, the terminal can determine a first portion of channels among multiple channels on which the second transmission needs to be performed. Then, for this first portion of channels, the terminal can determine a multi-channel access mechanism based on the second transmission, and access the first portion of channels based on the determined multi-channel access mechanism.

[0261] As for the second part of channels other than the first part of channels in the multiple channels, a channel access mechanism for accessing the second part of channels will be exemplarily described in subsequent embodiments.

[0262] In some embodiments, a multi-channel access mechanism for accessing the first part of the channel is determined based on the second transmission, including: the second transmission includes a physical direct link channel occupying multiple channels, and the multi-channel access mechanism for accessing the first part of the channel is determined to be a first multi-channel access mechanism.

[0263] In the case where the second transmission after the first transmission includes a physical direct link channel (such as PSCCH and / or PSSCH) occupying multiple channels, then the first part of the channel includes multiple channels, and in the multiple channels included in the first part of the channel, there are both first transmissions and second transmissions, so the number of channels occupied by the first transmission in the first part of the channel is the same as the number of channels occupied by the subsequent second transmission. Then, multi-channel access can be selected in the first part of the channel based on the first multi-channel access mechanism, so that the second transmission can be performed when all the channels in the first part are idle, which is conducive to ensuring the smooth progress of the second transmission.

[0264] In some embodiments, determining a multi-channel access mechanism for accessing the first portion of channels based on the second transmission includes:

[0265] The second transmission includes occupying a physical direct link channel of one channel, and determining a multi-channel access mechanism for accessing multiple channels as a second multi-channel access mechanism.

[0266] In the case where the second transmission after the first transmission includes a physical direct link channel (such as PSCCH and / or PSSCH) occupying one channel, for the second transmission, there is no need to consider accessing the channel through the first multi-channel access mechanism, so there will be no technical problem in judging whether to select the first multi-channel access mechanism or the second multi-channel access in the embodiment shown in Figure 3. Therefore, multi-channel access can be directly performed in multiple channels based on the second multi-channel access mechanism, so as to successfully access multiple channels as soon as possible, which is conducive to ensuring that the transmission operation is carried out in a timely manner.

[0267] In some embodiments, the channel access method further includes: determining a second portion of channels in a plurality of channels where no second transmission occurs after the first transmission; and determining a multi-channel access mechanism for accessing the second portion of channels based on the number of channels in the second portion of channels.

[0268] For a second transmission required after the first transmission, the terminal may determine a first portion of the multiple channels on which the second transmission is required, and a second portion of the multiple channels other than the first portion. Since the second portion of channels is used only for the first transmission and not for the second transmission, when determining a channel access mechanism for accessing the second portion of channels, the second transmission may not be considered. Instead, a multi-channel access mechanism for accessing the second portion of channels may be determined based on the number of channels in the second portion of channels.

[0269] In some embodiments, determining a multi-channel access mechanism for accessing the second portion of channels based on the number of channels in the second portion of channels includes: if the number of channels in the second portion of channels is multiple, determining that the multi-channel access mechanism for accessing the second portion of channels includes a second multi-channel access mechanism;

[0270] The channel access method further includes: the number of channels in the second part of channels is one, and determining that the channel access mechanism used to access the second part of channels includes a single channel access mechanism.

[0271] For example, if there are multiple channels in the second part of the channels, then a multi-channel access mechanism is still required to access the second part of the channels. Specifically, a second multi-channel access mechanism can be selected to access the second part of the channels as quickly as possible and reduce the delay of the transmission operation.

[0272] For example, if the number of channels in the second part of channels is one, then it is not necessary to use a multi-channel access mechanism for accessing the second part of channels, but a single-channel access mechanism can be selected for accessing.

[0273] In some embodiments, the channel access method further includes at least one of the following:

[0274] Successfully access the first part of the channel and transmit on the first part of the channel;

[0275] Successfully access the second part of the channel and transmit on the second part of the channel.

[0276] For the first part of the channel and the second part of the channel, if the terminal successfully accesses any part, it can transmit on the part of the channel that has been successfully accessed, without having to successfully access both the first part of the channel and the second part of the channel before transmitting. This is conducive to ensuring that the transmission operation is carried out as soon as possible.

[0277] In some embodiments, the second transmission includes at least one of the following:

[0278] a second transmission sent by the first terminal;

[0279] A second transmission is sent by a second terminal other than the first terminal, wherein the first terminal shares a plurality of channels with the second terminal.

[0280] In some embodiments, a first terminal may share multiple channels in an unlicensed frequency band with a second terminal (which may be one or more terminals), for example, where the second terminal is a responding terminal of the first terminal. When the first terminal and the second terminal share multiple channels in the unlicensed frequency band, the first terminal shares its own channel occupancy time (COT) with the second terminal, so that the second terminal can perform SL-U transmission on reserved resources within the COT.

[0281] When the first terminal triggers the channel access process for the multiple channels based on the first transmission on the direct link, even if the first terminal does not need to perform a second transmission after the first transmission, if the second terminal needs to perform a second transmission after the first transmission (for example, on reserved resources), the first terminal still needs to determine the multi-channel access mechanism for accessing the multiple channels based on the second transmission.

[0282] Therefore, when the first terminal determines the multi-channel access mechanism for accessing multiple channels, in addition to considering the second transmission of the first terminal itself after the first transmission, it also needs to consider the second transmission of the second terminal after the first transmission.

[0283] In some embodiments, the second transmission following the first transmission includes at least one of:

[0284] a second transmission adjacent to the first transmission in the time domain;

[0285] A second transmission having a first time interval smaller than a time interval threshold from the first transmission in the time domain.

[0286] The embodiments of the present disclosure are mainly implemented in a scenario where the terminal needs to perform a second transmission after the first transmission. The second transmission after the first transmission does not refer to any transmission after the first transmission, but a transmission that needs to meet certain conditions in the time domain.

[0287] For example, the second transmission may be a second transmission that is adjacent to the first transmission in the time domain; for example, the second transmission may be a second transmission that has a first interval in the time domain with the first transmission that is less than an interval threshold, wherein the interval threshold may be configured by a network device or determined based on a protocol agreement, for example, the interval threshold may be a channel occupancy time (COT), for example, the interval threshold may include multiple time domain units, and the time domain unit includes at least one of the following: frame, subframe, time slot (slot), symbol (symbol).

[0288] FIG6 is a schematic diagram showing another multi-channel access scenario according to an embodiment of the present disclosure.

[0289] As shown in Figure 6, the terminal's first repeated S-SSB transmission needs to occupy three channels: CH#1, CH#2, and CH#3; the subsequent PSSCH#1 transmission is in CH#1 and is adjacent to the S-SSB, and the subsequent PSSCH#2 is in CH#2, and the first interval between it and the S-SSB is less than the interval threshold, then PSSCH#1 and PSSCH#2 both belong to the second transmission after the first transmission.

[0290] It should be noted that the second transmission is not limited to the transmission in the above-mentioned cases. For example, it can also be a transmission within the same channel occupancy time (COT) as the first transmission. This disclosure does not limit this.

[0291] In some embodiments, the channel access method further includes: the first interval is greater than 16 microseconds, performing channel occupancy time recovery (COT resuming) during the second transmission, and performing channel access on each channel via type 2A.

[0292] Because the first and second transmissions are performed on the unlicensed frequency band, if the interval between the second and first transmissions is relatively large (e.g., greater than 16 microseconds), the terminal needs to perform channel occupancy time recovery when performing the second transmission to ensure that the second transmission is still performed on the unlicensed frequency band. However, if the interval between the second and first transmissions is relatively small (e.g., less than or equal to 16 microseconds), the terminal does not need to perform channel occupancy time recovery when performing the second transmission and can directly perform the second transmission.

[0293] In some embodiments, the names of information, etc. are not limited to the names described in the embodiments, and terms such as "information", "message", "signal", "signaling", "report", "configuration", "indication", "instruction", "command", "channel", "parameter", "domain", "field", "symbol", "symbol", "codeword", "codebook", "codeword", "codepoint", "bit", "data", "program", and "chip" can be used interchangeably.

[0294] In some embodiments, terms such as "uplink", "uplink", "physical uplink" can be interchangeable with each other, and terms such as "downlink", "downlink", "physical downlink" can be interchangeable with each other, and terms such as "side", "sidelink", "side communication", "sidelink communication", "direct connection", "direct link", "direct communication", "direct link communication" can be interchangeable with each other.

[0295] In some embodiments, terms such as "moment", "time point", "time", and "time position" can be replaced with each other, and terms such as "duration", "period", "time window", "window", and "time" can be replaced with each other.

[0296] In some embodiments, terms such as "frame", "radio frame", "subframe", "slot", "sub-slot", "mini-slot", "symbol", "symbol", and "transmission time interval (TTI)" can be used interchangeably.

[0297] In some embodiments, "obtain", "get", "get", "receive", "transmit", "bidirectional transmission", "send and / or receive" can be interchangeable, and can be interpreted as receiving from other entities, obtaining from protocols, obtaining from higher layers, obtaining by self-processing, autonomous implementation, etc.

[0298] In some embodiments, terms such as "send", "transmit", "report", "download", "transmit", "bidirectional transmission", "send and / or receive" can be used interchangeably.

[0299] Corresponding to the aforementioned embodiments of the channel access method and the communication method, the present disclosure also provides an embodiment of a terminal.

[0300] FIG7 is a schematic block diagram of a terminal according to an embodiment of the present disclosure. As shown in FIG7 , the terminal includes a processing module 701 and a communication module 702 .

[0301] In some embodiments, the processing module is used to trigger a channel access process for multiple channels in an unlicensed frequency band based on a first transmission in a direct link; and determine a multi-channel access mechanism for accessing the multiple channels based on a second transmission after the first transmission.

[0302] In some embodiments, the multi-channel access mechanism includes at least one of the following: a first multi-channel access mechanism; a second multi-channel access mechanism.

[0303] In some embodiments, the first multi-channel access mechanism includes: a multi-channel access mechanism for direct link transmission.

[0304] In some embodiments, the second multi-channel access mechanism includes at least one of the following:

[0305] Type A1 multi-channel access mechanism for the physical direct link feedback channel;

[0306] Type A1 multi-channel access mechanism for direct link simultaneous broadcast blocks;

[0307] Type A2 multi-channel access mechanism for the physical direct link feedback channel;

[0308] Type A2 multi-channel access mechanism for direct link simultaneous broadcast blocks;

[0309] Type B1 multi-channel access mechanism for the physical direct link feedback channel;

[0310] Type B1 multi-channel access mechanism for direct link synchronization broadcast blocks;

[0311] Type B2 multi-channel access mechanism for the physical direct link feedback channel;

[0312] Type B2 multi-channel access mechanism for direct link synchronization broadcast blocks.

[0313] In some embodiments, the first transmission includes at least one of: a physical direct link feedback channel; and a direct link synchronization broadcast block.

[0314] In some embodiments, the processing module is used to, where the first transmission includes a direct link synchronization broadcast block, determine a multi-channel access mechanism for accessing the multiple channels based on a second transmission after the first transmission, or determine a first portion of channels in the multiple channels where the second transmission exists after the first transmission, and determine to perform repeated transmission of the direct link synchronization broadcast block on the first portion of channels.

[0315] In some embodiments, the processing module is configured to determine that a multi-channel access mechanism for accessing the first portion of channels includes the first multi-channel access mechanism.

[0316] In some embodiments, the processing module is also used to, when direct link synchronization broadcast block repetition transmission is performed on the first part of the channel, the first part of the channel includes discontinuous channels, and the first terminal does not support direct link synchronization broadcast block repetition transmission on discontinuous channels, determine to perform direct link synchronization broadcast block repetition transmission on the channel between the discontinuous channels.

[0317] In some embodiments, the second transmission includes at least one of the following:

[0318] A physical direct link channel that occupies multiple channels;

[0319] A physical direct link channel occupies one channel.

[0320] In some embodiments, the processing module is used to determine a first portion of channels in the multiple channels where the second transmission exists after the first transmission; and determine a multi-channel access mechanism for accessing the first portion of channels based on the second transmission.

[0321] In some embodiments, the processing module is configured to, when the second transmission includes a physical direct link channel occupying multiple channels, determine a multi-channel access mechanism for accessing the first part of the channels as the first multi-channel access mechanism.

[0322] In some embodiments, the processing module is configured to, when the second transmission includes a physical direct link channel occupying one channel, determine that a multi-channel access mechanism for accessing the multiple channels is the second multi-channel access mechanism.

[0323] In some embodiments, the processing module is also used to determine a second portion of channels in the multiple channels where the second transmission does not exist after the first transmission; and determine a multi-channel access mechanism for accessing the second portion of channels based on the number of channels in the second portion of channels.

[0324] In some embodiments, the processing module is used to, when the number of channels in the second part of the channels is multiple, determine that the multi-channel access mechanism for accessing the second part of the channels includes the second multi-channel access mechanism; when the number of channels in the second part of the channels is one, determine that the channel access mechanism for accessing the second part of the channels includes a single-channel access mechanism.

[0325] In some embodiments, the communication module is used to successfully access the first portion of the channel and transmit on the first portion of the channel; and successfully access the second portion of the channel and transmit on the second portion of the channel.

[0326] In some embodiments, the physical direct link channel includes at least one of the following: a physical direct link control channel; and a physical direct link shared channel.

[0327] In some embodiments, the second transmission comprises at least one of: a second transmission sent by the first terminal; a second transmission sent by a second terminal other than the first terminal, wherein the first terminal and the second terminal share the plurality of channels.

[0328] In some embodiments, the second transmission after the first transmission includes at least one of the following:

[0329] a second transmission adjacent to the first transmission in the time domain;

[0330] A second transmission having a first time interval smaller than a time interval threshold from the first transmission in the time domain.

[0331] In some embodiments, the processing module is further configured to, when the first interval is greater than 16 microseconds, perform channel occupancy time recovery during the second transmission.

[0332] FIG8 is a schematic block diagram of a terminal according to an embodiment of the present disclosure. As shown in FIG8 , the terminal includes: a communication module 801 .

[0333] In some embodiments, the communication module is configured to communicate with the first terminal described in any one of the above embodiments via a direct link on multiple channels in an unlicensed frequency band.

[0334] For the device embodiment, since it basically corresponds to the method embodiment, the relevant parts can be referred to the partial description of the method embodiment. The device embodiment described above is merely illustrative, wherein the modules described as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical modules, that is, they may be located in one place, or they may be distributed on multiple network modules. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art can understand and implement it without paying any creative work.

[0335] The embodiments of the present disclosure further provide an apparatus for implementing any of the above methods. For example, an apparatus is provided, comprising units or modules for implementing each step performed by a terminal in any of the above methods. For another example, another apparatus is provided, comprising units or modules for implementing each step performed by a network device (e.g., an access network device, a core network function node, a core network device, etc.) in any of the above methods.

[0336] It should be understood that the division of the various units or modules in the above device is merely a division of logical functions. In actual implementation, they may be fully or partially integrated into a physical entity, or they may be physically separated. In addition, the units or modules in the device may be implemented in the form of a processor calling software: for example, the device includes a processor, the processor is connected to a memory, and the memory stores instructions. The processor calls the instructions stored in the memory to implement any of the above methods or implement the functions of the various units or modules of the above device, wherein the processor is, for example, a general-purpose processor, such as a central processing unit (CPU) or a microprocessor, and the memory is a memory within the device or a memory outside the device. Alternatively, the units or modules in the device can be implemented in the form of hardware circuits, and the functions of some or all of the units or modules can be realized by designing the hardware circuits. The above-mentioned hardware circuits can be understood as one or more processors; for example, in one implementation, the above-mentioned hardware circuit is an application-specific integrated circuit (ASIC), which realizes the functions of some or all of the above units or modules by designing the logical relationship of the components in the circuit; for example, in another implementation, the above-mentioned hardware circuit can be realized by a programmable logic device (PLD). Taking a field programmable gate array (FPGA) as an example, it can include a large number of logic gate circuits, and the connection relationship between the logic gate circuits is configured by configuring the configuration file, thereby realizing the functions of some or all of the above units or modules. All units or modules of the above devices can be realized in the form of software called by the processor, or in the form of hardware circuits, or in part by the form of software called by the processor, and the rest by hardware circuits.

[0337] In the embodiments of the present disclosure, the processor is a circuit with signal processing capabilities. In one implementation, the processor can be a circuit with instruction reading and execution capabilities, such as a central processing unit (CPU), a microprocessor, a graphics processing unit (GPU) (which can be understood as a microprocessor), or a digital signal processor (DSP). In another implementation, the processor can implement certain functions through the logical relationship of the hardware circuit. The logical relationship of the above-mentioned hardware circuit is fixed or reconfigurable. For example, the processor is a hardware circuit implemented by an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as an FPGA. In a reconfigurable hardware circuit, the process of the processor loading a configuration document and implementing the hardware circuit configuration can be understood as the process of the processor loading instructions to implement the functions of some or all of the above units or modules. In addition, it can also be a hardware circuit designed for artificial intelligence, which can be understood as an ASIC, such as a neural network processing unit (NPU), a tensor processing unit (TPU), a deep learning processing unit (DPU), etc.

[0338] Figure 9A is a schematic diagram of the structure of a communication device 9100 proposed in an embodiment of the present disclosure. Communication device 9100 can be a network device (e.g., an access network device, a core network device, etc.), a terminal (e.g., a user equipment, etc.), a chip, a chip system, or a processor that supports a network device to implement any of the above methods, or a chip, a chip system, or a processor that supports a terminal to implement any of the above methods. Communication device 9100 can be used to implement the methods described in the above method embodiments. For details, please refer to the description of the above method embodiments.

[0339] As shown in Figure 9A, the communication device 9100 includes one or more processors 9101. The processor 9101 can be a general-purpose processor or a dedicated processor, for example, a baseband processor or a central processing unit. The baseband processor can be used to process the communication protocol and communication data, and the central processing unit can be used to control the communication device (such as a base station, a baseband chip, a terminal device, a terminal device chip, a DU or a CU, etc.), execute programs, and process program data. Optionally, the communication device 9100 is used to perform any of the above methods. Optionally, one or more processors 9101 are used to call instructions to enable the communication device 9100 to perform any of the above methods.

[0340] In some embodiments, the communication device 9100 further includes one or more transceivers 9102. When the communication device 9100 includes one or more transceivers 9102, the transceiver 9102 performs at least one of the communication steps such as sending and / or receiving in the above method (for example, steps S201 and S202, but not limited thereto), and the processor 9101 performs at least one of the other steps (for example, steps S201 and S202, but not limited thereto). In an optional embodiment, the transceiver may include a receiver and / or a transmitter, and the receiver and transmitter may be separate or integrated. Optionally, the terms transceiver, transceiver unit, transceiver, transceiver circuit, interface circuit, and interface may be interchangeable, the terms transmitter, transmitting unit, transmitter, and transmitting circuit may be interchangeable, and the terms receiver, receiving unit, receiver, and receiving circuit may be interchangeable.

[0341] In some embodiments, the communication device 9100 further includes one or more memories 9103 for storing data. Alternatively, all or part of the memories 9103 may be located outside the communication device 9100. In alternative embodiments, the communication device 9100 may include one or more interface circuits 9104. Optionally, the interface circuits 9104 are connected to the memory 9102 and may be configured to receive data from the memory 9102 or other devices, or to send data to the memory 9102 or other devices. For example, the interface circuits 9104 may read data stored in the memory 9102 and send the data to the processor 9101.

[0342] The communication device 9100 described in the above embodiments may be a network device or a terminal, but the scope of the communication device 9100 described in the present disclosure is not limited thereto, and the structure of the communication device 9100 may not be limited to FIG. 9A. The communication device may be an independent device or may be part of a larger device. For example, the communication device may be: 1) an independent integrated circuit IC, or a chip, or a chip system or subsystem; (2) a collection of one or more ICs, optionally, the above IC collection may also include a storage component for storing data and programs; (3) an ASIC, such as a modem; (4) a module that can be embedded in other devices; (5) a receiver, a terminal device, an intelligent terminal device, a cellular phone, a wireless device, a handheld device, a mobile unit, an in-vehicle device, a network device, a cloud device, an artificial intelligence device, etc.; (6) others, etc.

[0343] 9B is a schematic diagram of the structure of a chip 9200 according to an embodiment of the present disclosure. If the communication device 9100 can be a chip or a chip system, please refer to the schematic diagram of the structure of the chip 9200 shown in FIG9B , but the present disclosure is not limited thereto.

[0344] The chip 9200 includes one or more processors 9201. The chip 9200 is configured to execute any of the above methods.

[0345] In some embodiments, chip 9200 further includes one or more interface circuits 9202. Terms such as interface circuit, interface, and transceiver pins may be used interchangeably. In some embodiments, chip 9200 further includes one or more memories 9203 for storing data. Alternatively, all or part of memory 9203 may be located external to chip 9200. Optionally, interface circuit 9202 is connected to memory 9203 and may be used to receive data from memory 9203 or other devices, or may be used to send data to memory 9203 or other devices. For example, interface circuit 9202 may read data stored in memory 9203 and send the data to processor 9201.

[0346] In some embodiments, the interface circuit 9202 performs at least one of the communication steps (e.g., steps S201 and S202, but not limited thereto) in the above method. For example, the interface circuit 9202 performing the communication steps (e.g., steps S201 and S202) in the above method means that the interface circuit 9202 performs data exchange between the processor 9201, chip 9200, memory 9203, or a transceiver device. In some embodiments, the processor 9201 performs at least one of the other steps (e.g., steps S201 and S202, but not limited thereto).

[0347] The modules and / or devices described in various embodiments, such as virtual devices, physical devices, and chips, can be arbitrarily combined or separated according to circumstances. Optionally, some or all steps can also be performed collaboratively by multiple modules and / or devices, which is not limited here.

[0348] The present disclosure also proposes a storage medium having instructions stored thereon, which, when executed on the communication device 9100, causes the communication device 9100 to execute any of the above methods. Optionally, the storage medium is an electronic storage medium. Optionally, the storage medium is a computer-readable storage medium, but is not limited thereto and may also be a storage medium readable by other devices. Optionally, the storage medium may be a non-transitory storage medium, but is not limited thereto and may also be a temporary storage medium.

[0349] The present disclosure also provides a program product, which, when executed by the communication device 9100, enables the communication device 9100 to perform any of the above methods. Optionally, the program product is a computer program product.

[0350] The present disclosure also proposes a computer program, which, when executed on a computer, causes the computer to perform any one of the above methods.

Claims

1. A channel access method, characterized in that: The method is performed by a first terminal and includes: triggering a channel access process for a plurality of channels in an unlicensed frequency band based on a first transmission on the direct link; A multi-channel access mechanism for accessing the plurality of channels is determined based on a second transmission subsequent to the first transmission.

2. The method according to claim 1, characterized in that: The multi-channel access mechanism includes at least one of the following: A first multi-channel access mechanism; Second multi-channel access mechanism.

3. The method according to claim 2, characterized in that The first multi-channel access mechanism includes: Multi-channel access mechanism for direct link transmission.

4. The method according to claim 2, characterized in that: The second multi-channel access mechanism includes at least one of the following: Type A1 multi-channel access mechanism for the physical direct link feedback channel; Type A1 multi-channel access mechanism for direct link synchronous broadcast blocks; Type A2 multi-channel access mechanism for the physical direct link feedback channel; Type A2 multi-channel access mechanism for direct link synchronous broadcast blocks; Type B1 multi-channel access mechanism for physical direct link feedback channel; Type B1 multi-channel access mechanism for direct link synchronous broadcast blocks; Type B2 multi-channel access mechanism for physical direct link feedback channel; Type B2 multi-channel access mechanism for direct link synchronization broadcast blocks.

5. The method according to any one of claims 2 to 4, characterized in that The first transmission includes at least one of the following: Physical direct link feedback channel; Direct link synchronization broadcast block.

6. The method according to claim 5, characterized in that The method further comprises: The first transmission includes a direct link synchronization broadcast block, and a multi-channel access mechanism for accessing the multiple channels is determined based on a second transmission after the first transmission, or a first part of channels among the multiple channels where the second transmission exists after the first transmission is determined, and repeated transmission of the direct link synchronization broadcast block is determined on the first part of channels.

7. The method according to claim 6, characterized in that The method further comprises: Determining a multi-channel access mechanism for accessing the first portion of channels includes the first multi-channel access mechanism.

8. The method according to claim 6, characterized in that The method further comprises: When repeated transmission of direct link synchronization broadcast blocks is performed on the first part of the channels, the first part of the channels includes discontinuous channels, and the first terminal does not support repeated transmission of direct link synchronization broadcast blocks on discontinuous channels, it is determined to perform repeated transmission of direct link synchronization broadcast blocks on a channel between the discontinuous channels.

9. The method according to any one of claims 2 to 8, characterized in that The second transmission includes at least one of the following: A physical direct link channel that occupies multiple channels; A physical direct link channel occupies one channel.

10. The method according to claim 9, characterized in that The determining, according to a second transmission after the first transmission, a multi-channel access mechanism for accessing the plurality of channels comprises: Determine a first portion of channels among the plurality of channels where the second transmission occurs after the first transmission; A multi-channel access mechanism for accessing the first portion of channels is determined based on the second transmission.

11. The method according to claim 10, characterized in that The determining, according to the second transmission, a multi-channel access mechanism for accessing the first part of channels comprises: The second transmission includes a physical direct link channel occupying multiple channels, and a multi-channel access mechanism used to access the first part of channels is determined to be the first multi-channel access mechanism.

12. The method according to claim 10, characterized in that The determining, according to the second transmission, a multi-channel access mechanism for accessing the first part of channels comprises: The second transmission includes a physical direct link channel occupying one channel, and a multi-channel access mechanism for accessing the multiple channels is determined to be the second multi-channel access mechanism.

13. The method according to any one of claims 10 to 12, characterized in that The method further comprises: determining a second portion of channels of the plurality of channels where the second transmission does not exist after the first transmission; A multi-channel access mechanism for accessing the second portion of channels is determined according to the number of channels in the second portion of channels.

14. The method according to claim 13, characterized in that The determining, according to the number of channels in the second part of channels, a multi-channel access mechanism for accessing the second part of channels comprises: The number of channels in the second part of channels is multiple, and determining that the multi-channel access mechanism for accessing the second part of channels includes the second multi-channel access mechanism; Wherein, the method further comprises: The number of channels in the second part of channels is one, and the channel access mechanism determined to be used to access the second part of channels includes a single channel access mechanism.

15. The method according to claim 13 or 14, characterized in that The method further comprises at least one of the following ： successfully accessing the first part of channels and transmitting on the first part of channels; The second part of the channels is successfully accessed and transmission is performed on the second part of the channels.

16. The method according to any one of claims 9 to 15, characterized in that The physical direct link channel includes at least one of the following: Physical direct link control channel; Physical direct links share the channel.

17. The method according to any one of claims 1 to 16, characterized in that The second transmission includes at least one of the following: a second transmission sent by the first terminal; A second transmission sent by a second terminal other than the first terminal, wherein the first terminal shares the plurality of channels with the second terminal.

18. The method according to any one of claims 1 to 17, characterized in that The second transmission after the first transmission includes at least one of the following: a second transmission adjacent to the first transmission in the time domain; A second transmission having a first interval in the time domain with respect to the first transmission being less than an interval threshold.

19. The method according to claim 18, characterized in that The method further comprises: The first interval is greater than 16 microseconds, and channel occupancy time recovery is performed when performing the second transmission.

20. A communication method, characterized in that: The method is performed by the second terminal, and includes: Communicate with the first terminal according to any one of claims 1 to 19 via a direct link on multiple channels in an unlicensed frequency band.

21. A terminal, characterized in that: include: one or more processors; The terminal is used to execute the channel access method according to any one of claims 1 to 19.

22. A terminal, characterized in that: include: one or more processors; Wherein, the terminal is used to execute the communication method described in claim 20.

23. A communication system, characterized in that: It comprises a first terminal and a second terminal, wherein the first terminal is configured to implement the channel access method described in any one of claims 1 to 19, and the second terminal is configured to implement the communication method described in claim 20.

24. A storage medium storing instructions, characterized in that: When the instruction is executed on the communication device, the communication device executes the channel access method as described in any one of claims 1 to 19, and / or the communication method as described in claim 20.

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