Method and device for coordination between devices

Abstract

Embodiments of the present disclosure provide a method and apparatus for inter-device coordination, the method comprising: receiving, by means of a first terminal device, first sidelink information from a second terminal device and second sidelink information from a third terminal device; determining, according to the first sidelink information and the second sidelink information, that a first resource reserved by the first sidelink information needs to be re-selected; and transmitting first coordination information to the second terminal device to indicate that the first resource needs to be re-selected, wherein the priority of the first coordination information is the same as the highest priority among the priority of the first sidelink information and the priority of the second sidelink information.

Description

Technology Field

[0001] The embodiments of the present disclosure relate to the field of communication technology. Background Technology

[0002] V2X (Vehicle to Everything) is a vehicle communication technology. Compared to cellular communication using U-link, V2X transmitting devices communicate directly with receiving devices via sidelinks. New Radio (NR) V2X is a key project of 5G Rel-16. Compared to Long Term Evolution (LTE) V2X in Rel-14 / Rel-15, NR V2X can support more scenarios and services and meet higher performance requirements.

[0003] The physical channels defined by Rel-16 NR V2X include the Physical Sidelink Control Channel (PSCCH), the Physical Sidelink Shared Channel (PSSCH), and the Physical Sidelink Feedback Channel (PSFCH). The PSCCH carries the first-stage sidelink control information (SCI), and the first-stage SCI is primarily used to reserve one or more resources. The PSSCH carries the second-stage SCI and the transmission block (TB), where the second-stage SCI is primarily used for TB demodulation.

[0004] PSFCH carries sidelink feedback information (which may be referred to as HARQ-ACK). PSCCH and PSSCH are generally transmitted in the same slot. A single PSCCH / PSSCH is associated with one or more PSFCH resources according to established rules. After transmitting a PSCCH / PSSCH, the device can receive an acknowledgment (ACK) or non-acknowledgment (NACK) on the associated PSFCH resources. NR V2X supports HARQ-ACK feedback for unicast and groupcast. Groupcast additionally includes two HARQ-ACK feedback modes: HARQ Option 1 and HARQ Option 2.

[0005] In the case of a group cast with HARQ Option 1, only receiving devices within a specific communication range provide feedback for HARQ-ACK, and use a mode that provides feedback only for NACK (NACK-only). More specifically, all receiving devices share the same PSFCH resource, that is, perform feedback on the same PSFCH resource; feedback is performed only in the case of a NACK (where PSFCH is transmitted), and PSFCH is not transmitted in the case of an ACK. ACK and NACK are distinguished by the presence or absence of a PSFCH signal. PSFCHs transmitted by multiple devices may create the same directional overlap on the same resource, and the transmitting device determines whether to send a NACK or an ACK based on the presence or absence of the PSFCH signal, and the transmitting device does not know which specific receiving device is sending a NACK.

[0006] In the case of a group cast with HARQ option 2, the PSFCH resources for feeding back ACK / NACK by each receiving device are independent. The receiving device feeds back an ACK when it receives correctly and a NACK when it receives incorrectly. The ACK and NACK are distinguished by different PSFCH sequences (circular shifts), and the transmitting device knows which receiving device is sending the ACK / NACK.

[0007] Resources used for sidelink transmission (time-frequency resources) are located in a resource pool. NR V2X defines two modes of operation. In the case of NR V2X Mode 1 (Mode 1), resources used by terminal equipment for V2X communication are scheduled or configured by network devices (base stations) via the NR Uu link. In the case of NR V2X Mode 2 (Mode 2), terminal equipment can autonomously select time-frequency resources for V2X communication based on detection results.

[0008] It should be noted that the above introduction to the technical background is merely intended to facilitate a clear and complete description of the technical solutions of the present disclosure and is described in detail to facilitate the understanding of those skilled in the art. The above technical solutions should not be considered to be known to those skilled in the art merely because they have been described in detail in the background of the present disclosure. The problem to be solved

[0009] The inventors found that regarding autonomous resource selection (Mode 2) of Rel-16 NR V2X, terminal equipment selects and transmits resources based on its own detection results, which can avoid interference or collisions between devices to some extent. However, in some cases, the problem of resource transmission collisions still occurs. Therefore, as an improvement to autonomous resource selection (Mode 2), coordination between devices (between UEs) became one of the research topics for Rel-17 V2X. Specific modes of coordination between devices, etc., are problems that need to be researched and solved. means of solving the problem

[0010] For at least one of the above problems, embodiments of the present disclosure provide a method and apparatus for coordinating between devices.

[0011] According to one aspect of the embodiments of the present disclosure, a method for coordinating between devices is provided, the method being:

[0012] A step of receiving first sidelink information from a second terminal device and second sidelink information from a third terminal device by means of a first terminal device;

[0013] A step of determining, based on the first sidelink information and the second sidelink information, that the first resource reserved by the first sidelink information needs to be re-selected; and

[0014] It includes the step of transmitting first coordination information to a second terminal device to indicate that a first resource needs to be re-selected—the priority of the first coordination information is the same as the highest priority among the priority of the first sidelink information and the priority of the second sidelink information.

[0015] According to one aspect of the embodiments of the present disclosure, a device-to-device coordination device is provided, wherein the device is:

[0016] A receiving unit configured to receive first sidelink information from a second terminal device and second sidelink information from a third terminal device;

[0017] A decision unit configured to determine, based on first sidelink information and second sidelink information, that a first resource reserved by the first sidelink information needs to be re-selected; and

[0018] It includes a transmitting unit configured to transmit first coordination information to a second terminal device to indicate that a first resource needs to be re-selected—the priority of the first coordination information is the same as the highest priority among the priority of the first sidelink information and the priority of the second sidelink information.

[0019] According to another aspect of the embodiments of the present disclosure, a method for coordinating devices is provided, the method being:

[0020] A step of receiving sidelink information from a second terminal device by means of a first terminal device; and

[0021] It includes the step of transmitting a reselection command to the second terminal equipment to instruct it to perform resource reselection of sidelink information and / or acknowledgment or non-acknowledgment, depending on whether the first terminal equipment is the destination terminal equipment of the second terminal equipment.

[0022] According to another aspect of the embodiments of the present disclosure, a device-to-device coordination device is provided, the device being:

[0023] A receiving unit configured to receive sidelink information from a second terminal device; and

[0024] It includes a transmitting unit configured to transmit a reselection command to the second terminal equipment to instruct it to perform resource reselection of sidelink information and / or acknowledgment or non-acknowledgment, depending on whether the first terminal equipment is the destination terminal equipment of the second terminal equipment.

[0025] According to another aspect of the embodiments of the present disclosure, a method for coordinating devices is provided, the method being:

[0026] A step of receiving sidelink information from a second terminal device by means of a first terminal device; and

[0027] It includes the step of transmitting a reselection command to the second terminal equipment to instruct it to perform resource reselection using the first resource or the second resource, depending on whether the first terminal equipment is the destination terminal equipment of the second terminal equipment.

[0028] According to another aspect of the embodiments of the present disclosure, a device-to-device coordination device is provided, the device being:

[0029] A receiving unit configured to receive sidelink information from a second terminal device; and

[0030] It includes a transmission unit configured to transmit a reselection command to a second terminal device to instruct it to perform resource reselection using a first resource or a second resource, depending on whether the first terminal device is the destination terminal device of the second terminal device.

[0031] One of the advantageous effects of the embodiments of the present disclosure is that the priority of coordination information can be accurately determined, and when it is determined that sidelink information is transmitted or discarded based on priority rules, it can be ensured that the priority of transmitting collision commands matches the priority of the service, and that information related to a higher priority service can be transmitted preferentially.

[0032] With reference to the following description and drawings, specific embodiments of the present disclosure are disclosed in detail, illustrating ways in which the principles of the present disclosure may be adopted. It should be understood that the embodiments of the present disclosure are not limited in scope. Within the scope of the terms and spirit of the appended claims, the embodiments of the present disclosure include many changes, modifications, and equivalents.

[0033] Features described and / or illustrated in relation to one implementation may be used in one or more other implementations in the same or similar manner, and may be combined with or substitute for features in other implementations.

[0034] It should be emphasized that when used in this specification, the term “comprise / include” refers to the presence of a feature, whole piece, step, or component, but does not exclude the presence or addition of one or more other features, whole pieces, steps, or components. Brief explanation of the drawing

[0035] The elements and features described in the drawings or embodiments of the embodiments of this disclosure may be combined with the elements and features shown in one or more other drawings or embodiments. Additionally, in the drawings, similar labels may be used to indicate corresponding components in multiple drawings and to indicate corresponding components used in more than one embodiment. FIG. 1 is a schematic diagram of a communication system in an embodiment of the present disclosure; FIG. 2 is an exemplary diagram of inter-device coordination in embodiments of the present disclosure; FIG. 3 is a schematic diagram of a method for coordinating devices in embodiments of the present disclosure; FIG. 4 is an exemplary drawing of transmitting adjustment information in embodiments of the present disclosure; FIG. 5 is a schematic diagram of a method for coordinating devices in embodiments of the present disclosure; FIG. 6 is an exemplary drawing of transmitting adjustment information in embodiments of the present disclosure; FIG. 7 is an exemplary drawing of PSFCH in embodiments of the present disclosure; FIG. 8 is an exemplary drawing of feeding back PSFCH in embodiments of the present disclosure; FIG. 9 is another exemplary drawing of feeding back PSFCH in embodiments of the present disclosure; FIG. 10 is a schematic diagram of a method for coordinating devices in embodiments of the present disclosure; FIG. 11 is a schematic diagram of a method for coordinating devices in embodiments of the present disclosure; FIG. 12 is another exemplary drawing of PSFCH in embodiments of the present disclosure; FIG. 13 is another exemplary drawing of transmitting adjustment information in embodiments of the present disclosure; FIG. 14 is another exemplary drawing of transmitting adjustment information in embodiments of the present disclosure; FIG. 15 is another exemplary drawing of transmitting adjustment information in embodiments of the present disclosure; FIG. 16 is another exemplary drawing of transmitting adjustment information in embodiments of the present disclosure; FIG. 17 is another exemplary drawing of transmitting adjustment information in embodiments of the present disclosure; FIG. 18 is a schematic diagram of a device-to-device coordination device in embodiments of the present disclosure; FIG. 19 is a schematic diagram of a device-to-device coordination device in embodiments of the present disclosure; FIG. 20 is a schematic diagram of a network device in embodiments of the present disclosure; FIG. 21 is a schematic diagram of terminal equipment in embodiments of the present disclosure. Specific details for implementing the invention

[0036] With reference to the drawings, the above and other features of the present disclosure will become apparent through the following specification. The specification and drawings specifically disclose specific embodiments of the present disclosure, representing partial implementations capable of adopting the principles of the present disclosure. It should be understood that the present disclosure is not limited to the described implementations, but rather includes all modifications, variations, and equivalents falling within the scope of the appended claims.

[0037] In the embodiments of the present disclosure, terms “first,” “second,” etc. are used to distinguish different elements in terms of nomenclature, but do not indicate a spatial arrangement or temporal sequence of such elements, and such elements should not be limited by such terms. The term “and / or” includes any combination of one or more listed associated terms. Terms “include,” “comprise,” and “have,” etc. refer to the presence of the mentioned features, elements, parts, or components, but do not exclude the presence or addition of one or more other features, elements, parts, or components.

[0038] In the embodiments of the present disclosure, singular forms (“a / an” and “the,” etc.) include plural forms and should be broadly understood as “of one kind” or “of one type,” but not defined as having the meaning of “one”; furthermore, the term “the above” should be understood to include both singular and plural forms unless the context clearly indicates otherwise. Additionally, the term “according to” should be understood as “at least partially according to,” and the term “based on” should be understood as “at least partially based on,” unless the context clearly indicates otherwise.

[0039] In the embodiments of the present disclosure, the term “communication network” or “wireless communication network” may refer to a network that satisfies any of the following communication standards, such as LTE (Long Term Evolution), LTE-A (LTE-Advanced), WCDMA (Wideband Code Division Multiple Access), HSPA (High-Speed ​​Packet Access), etc.

[0040] And, communication between devices in a communication system may be performed according to a communication protocol at any stage, and may include, but is not limited to, the following communication protocols: 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G, 5G, New Radio (NR), and / or other communication protocols currently known or to be developed in the future.

[0041] In embodiments of the present disclosure, the term “network device” refers to a device that connects terminal equipment within a communication system to a communication network and provides services to the terminal equipment, for example. A network device may include, but is not limited to, subsequent devices: a base station (BS), an access point (AP), a transmission receiving point (TRP), a broadcast transmitter, a mobile management entity (MME), a gateway, a server, a radio network controller (RNC), and a base station controller (BSC).

[0042] Base stations may include, but are not limited to, Node B (NodeB or NB), Evolution Node B (eNodeB or eNB), and 5G base stations (gNB), and may additionally include Remote Radio Heads (RRHs), Remote Radio Units (RRUs), relays, or low-power nodes (femto, pico, etc.). The term "BS" may include some or all of their functions, and each BS may provide communication coverage in a specific geographical area. The term "cell" may refer to a BS and / or its coverage area, depending on the context in which the term is used.

[0043] In the embodiments of the present disclosure, the terms “User Equipment (UE)” or “Terminal Equipment (TE) or Terminal Device” refer, for example, to a device that accesses a communication network and receives network services through a network device. The terminal equipment may be fixed or mobile and may also be referred to as a mobile station (MS), terminal, subscriber station (SS), access terminal (AT), and station, etc.

[0044] Terminal equipment may include, but is not limited to, the following devices: cellular phones, PDAs (Personal Digital Assistants), wireless modems, wireless communication devices, handheld devices, machine-type communication devices, laptop computers, wireless phones, smartphones, smartwatches, and digital cameras.

[0045] As another example, under scenarios such as the Internet of Things (IoT), terminal equipment may also be a machine or device for monitoring or measurement, and may include, but is not limited to, the following: Machine Type Communication (MTC) terminals, vehicle-mounted communication terminals, Device to Device (D2D) terminals, and Machine to Machine (M2M) terminals.

[0046] Furthermore, the terms “network side” or “network device side” refer to an aspect of a network that may be a base station and may include one or more of the aforementioned network devices. The terms “user side”, “terminal side” or “terminal equipment side” refer to an aspect of a user or terminal that may be a UE and may include one or more of the aforementioned terminal equipment. Unless specifically mentioned herein, “device” may refer to a network device or terminal equipment.

[0047] Scenarios of embodiments of the present disclosure are described through the following examples, but the present disclosure is not limited thereto.

[0048] FIG. 1 is a schematic diagram of a communication system in embodiments of the present disclosure, and describes situations schematically by way of example terminal equipment and network devices, and as shown in FIG. 1, the communication system (100) may include a network device (101) and terminal equipment (102 and 103). For simplicity, FIG. 1 takes only two terminal equipment and one network device as examples for explanation, but embodiments of the present disclosure are not limited thereto.

[0049] In embodiments of the present disclosure, transmission of existing or additionally implementable services may be performed between a network device (101) and terminal equipment (102 and 103). For example, these services may include, but are not limited to: eMBB (enhanced Mobile Broadband), mMTC (massive Machine Type Communication), and URLLC (Ultra-Reliable and Low-Latency Communication).

[0050] FIG. 1 illustrates that two terminal devices (102 and 103) are within the coverage of a network device (101), but it is worth noting that the present disclosure is not limited thereto. Two terminal devices (102 and 103) may be outside the coverage of the network device (101), or one terminal device (102) may be within the coverage of the network device (101) and the other terminal device (103) may be outside the coverage of the network device (101).

[0051] In embodiments of the present disclosure, sidelink transmission may be performed between two terminal devices (102 and 103). For example, both of the two terminal devices (102 and 103) may transmit a sidelink within the coverage of the network device (101) to achieve V2X communication, or both may transmit a sidelink outside the coverage of the network device (101) to achieve V2X communication, and it is also possible for one terminal device (102) to be inside the coverage of the network device (101) and the other terminal device (103) to be outside the coverage of the network device (101) to transmit a sidelink to achieve V2X communication.

[0052] In embodiments of the present disclosure, terminal equipment(s) (102 and / or 103) may autonomously select sidelink resources (i.e., using mode 2). Under this situation, sidelink transmission may be independent of the network device (101), i.e., the network device (101) is optional. Of course, embodiments of the present disclosure may also combine the autonomous selection of sidelink resources (i.e., using mode 2) with the allocation of sidelink resources by the network device (i.e., using mode 1), and embodiments of the present disclosure are not limited thereto.

[0053] In LTE V2X and NR V2X, terminal equipment can acquire sidelink transmission resources through a process of sensing detection + resource selection, wherein successive sensing can be performed to acquire resource occupancy from a resource pool. For example, terminal equipment can estimate resource occupancy in a subsequent time period (referred to as the selection window) based on resource occupancy in a previous time period (referred to as the sensing window).

[0054] For autonomous resource selection (Mode 2) of Rel-16 NR V2X, the terminal equipment selects and transmits resources based on its own sensing results, which can avoid interference or collisions between devices to some extent. For the steps for resource selection, refer to Section 8.1.4 of the standard TS 38.214 V16.2.0.

[0055] Rel-17 V2X introduces enhancements to autonomous resource selection Mode 2. Through inter-device coordination, transmission reliability in Mode 2 can be improved and transmission delay in Mode 2 can be reduced. Inter-device coordination has become one of the research topics of Rel-17 V2X. Inter-device coordination requires interaction information between devices (referred to as coordination information). Coordination information can be used to improve Mode 2 resource selection. Coordination information can indicate whether collisions exist. Collisions can include resource collision issues, half-duplex issues, etc.

[0056] In some cases, resource conflict problems still occur. For example, a hidden node problem occurs: Device B transmits sidelink information to Device A, and an interference source Device C exists near Device A; and because Device B cannot detect Device C, Device B's transmission is interfered with by Device C. That is, Device C can be considered a hidden node.

[0057] FIG. 2 is an exemplary diagram of inter-device coordination in embodiments of the present disclosure where device C is a hidden node. As illustrated in FIG. 2, for example, since device A can detect device C, device A can detect a conflict between device B and device C, and thus transmit a conflict indication (such as using 1 bit) to device B and / or device C to indicate to device B and / or device C to perform resource reselection, the aforementioned hidden node problem can be avoided, and this is actually inter-device coordination.

[0058] In addition, traditional Mode 2 resource selection also faces the half-duplex problem. For example, if Device B and Device C perform transmissions simultaneously in the same slot, Device B and Device C cannot receive sidelink information transmitted by the other party due to half-duplex limitations; that is, a half-duplex problem occurs.

[0059] For example, Device A receives SCIs transmitted from Device B and Device C, and since it is aware that a half-duplex issue is occurring at Device B and Device C, Device A may transmit a collision indication (such as using 1 bit) to Device B and / or Device C to indicate that a resource reselection or retransmission should be performed, thereby avoiding the aforementioned half-duplex issue, which is actually inter-device coordination.

[0060] Currently, the method by which Device A indicates to Device B whether there is a conflict (e.g., resource conflict issues and / or half-duplex issues) is still a problem that needs to be studied and resolved. In embodiments of the present disclosure, Device A transmits coordination information to Device B, and the coordination information may indicate to Device B that resource reselection or retransmission should be performed.

[0061] For simplification, this is referred to as coordination information indicating reselection or retransmission. Equivalently, this may also be referred to as coordination information indicating a pre-collision, post-collision, or half-duplex issue, and Device B may decide to perform resource reselection or retransmission based on the pre-collision, post-collision, or half-duplex. Equivalently, this may also be referred to as coordination information indicating a collision, and depending on the role of the indication, at least part of the coordination information may be referred to as a retransmission indication or a reselection indication. Equivalently, the reselection indication may also be referred to as an indication of an anticipated collision.

[0062] In the embodiments of the present disclosure, V2X is used as an example to describe a sidelink, but the present disclosure is not limited thereto and may be applied to sidelink transmission scenarios other than V2X. In the following description, without causing confusion, the terms "sidelink" and "V2X" are interchangeable, the terms "PSFCH" and "sidelink feedback channel" are interchangeable, the terms "PSCCH" and "sidelink control channel" or "sidelink control information" are interchangeable, and the terms "PSSCH" and "sidelink data channel" or "sidelink data" are also interchangeable.

[0063] Additionally, transmitting or receiving a PSCCH can be understood as transmitting or receiving sidelink control information carried by the PSCCH; transmitting or receiving a PSSCH can be understood as transmitting or receiving sidelink data carried by the PSSCH; and transmitting or receiving a PSFCH can be understood as transmitting or receiving sidelink feedback information carried by the PSFCH. Sidelink transmission (also referred to as sidelink transfer) can be understood as PSCCH / PSSCH transmission or sidelink data / information transmission.

[0064] Examples of the first aspect

[0065] Embodiments of the present disclosure provide a method for coordinating devices described from a first terminal device. The first terminal device (Device A) may receive sidelink information (e.g., SCI and PSSCH) transmitted by a second terminal device (Device B) and / or a third terminal device (Device C).

[0066] FIG. 3 is a schematic diagram of a method for coordinating devices in embodiments of the present disclosure, and as shown in FIG. 3, the method comprises the following:

[0067] 301, the first terminal equipment receiving first sidelink information from the second terminal equipment and second sidelink information from the third terminal equipment;

[0068] 302, the first terminal equipment determines, based on the first sidelink information and the second sidelink information, that the first resource reserved by the first sidelink information needs to be re-selected;

[0069] 303, the first terminal equipment transmits first coordination information to the second terminal equipment to indicate that the first resource needs to be re-selected, wherein the priority of the first coordination information is the same as the highest priority among the priority of the first sidelink information and the priority of the second sidelink information.

[0070] It should be noted that FIG. 3 above is merely a schematic description of embodiments of the present disclosure and is not limited thereto. For example, the execution steps of each operation may be appropriately adjusted, and furthermore, some other operations may be increased or decreased. Those skilled in the art are not limited to the descriptions in FIG. 3 above and may make appropriate modifications based on the above.

[0071] In some embodiments, the device may need to transmit coordination information and other information simultaneously. The other information includes sidelink information and / or uplink information such as PSFCH, PUSCH, etc., which are not listed. As limited by the device's capabilities, the device may need to select information from M pieces of information from N pieces to perform transmission (M <N). 디바이스는 정보의 우선순위에 기초하여 어떤 피스의 정보가 최종적으로 송신될지를 결정할 필요가 있다. 사이드링크 정보 및 업링크 정보의 우선순위들은 표준들에서 정의되었다. 조정 정보의 우선순위를 결정하는 방법은 해결될 필요가 있는 문제이다.

[0072] In some embodiments, the first sidelink information includes a first sidelink control information (SCI) and a first physical sidelink sharing channel (PSSCH), and the priority of the first sidelink information is the same as the priority indicated by a field in the first sidelink control information; and the second sidelink information includes a second sidelink control information (SCI) and a second physical sidelink sharing channel (PSSCH), and the priority of the second sidelink information is the same as the priority indicated by a field in the second sidelink control information.

[0073] In some embodiments, the first resource reserved by the first sidelink control information and the second resource reserved by the second sidelink control information overlap at least partially in the time domain and the frequency domain.

[0074] FIG. 4 is an exemplary diagram of transmitting coordination information in embodiments of the present disclosure. As shown in FIG. 4, the next resource (resource 2) is reserved by the resource (resource 1) of device B for transmission via SCI; the next resource (resource 4) is reserved by the resource (resource 3) of device C for transmission via SCI; and resources 2 and 4 conflict, that is, time-frequency resources overlap (at least partially overlap (or completely overlap) in the time domain and frequency domain).

[0075] Device A receives the SCI transmitted by Device B from Resource 1 and the SCI transmitted by Device C from Resource 3, and based on the SCI, it can determine that Resource 2 and Resource 4 of Device B and Device C will subsequently collide. Therefore, Device A transmits coordination information B to Device B before the collision occurs and notifies Device B of resource reselection. After receiving coordination information B, Device B performs resource reselection, that is, Device B can select a resource that does not collide with Resource 4 for transmission in order to avoid the collision.

[0076] Since coordination information B is used to protect the PSSCHs of devices B and C from collisions, the priority of coordination information B is the same as the highest PSSCH priority in devices B and C. Therefore, the priority of coordination information can be accurately determined, and when it is determined that sidelink information is transmitted or discarded based on priority rules, it can be guaranteed that the priority of transmitting collision commands matches the priority of the service, and that information related to high-priority services can be transmitted preferentially.

[0077] In some embodiments, the first coordination information may be carried by a physical sidelink feedback channel (PSFCH). For example, when the coordination information is used to indicate reselection, the PSFCH resource may be an additionally configured or pre-configured RB resource or a sequence resource. Here, the sequence may be determined by parameters such as a cyclic shift. The present disclosure is not limited thereto, and, for example, other resources may also be used to carry the coordination information.

[0078] In some embodiments, the first terminal equipment is the destination receiving terminal equipment of the second terminal equipment. In some embodiments, the first terminal equipment is not the destination receiving terminal equipment of the second terminal equipment, but the first terminal equipment is the destination receiving terminal equipment of the third terminal equipment. The destination receiving terminal equipment refers, for example, to a receiving device for receiving PSCCH / PSSCH. For specific implementations, the embodiments of the sixth aspect described later may also be referenced.

[0079] In some embodiments, the second terminal equipment performs unicast, groupcast, or broadcast sidelink communication. That is, the above embodiments can be applied to any scenario of unicast, groupcast, or broadcast.

[0080] Each of the above embodiments is merely an example of the embodiments of the present disclosure, but the present disclosure is not limited thereto, and appropriate modifications may also be made based on each of the above embodiments. For example, each of the above embodiments may be used individually, or one or more of the above embodiments may be combined.

[0081] As can be seen from the above embodiments, the priority of the first coordination information is the same as the highest priority among the priority of the first sidelink information and the priority of the second sidelink information. Therefore, the priority of the coordination information can be accurately determined, and when it is determined that the sidelink information is transmitted or discarded based on the priority rule, it can be guaranteed that the priority of transmitting the conflict command matches the priority of the service, and that high-priority service-related information can be transmitted preferentially.

[0082] Examples of the second aspect

[0083] Embodiments of the present disclosure provide a method for coordinating devices described from a first terminal device. Embodiments of the present disclosure may be combined with embodiments of a first aspect or may be implemented separately.

[0084] FIG. 5 is a schematic diagram of a method for coordinating devices in embodiments of the present disclosure, and as shown in FIG. 5, the present method comprises the following:

[0085] 501, the first terminal equipment receiving first sidelink information from the second terminal equipment and second sidelink information from the third terminal equipment;

[0086] 502, the first terminal equipment determining that the first sidelink information and the second sidelink information need to be retransmitted according to the first sidelink information and the second sidelink information; and

[0087] 503, the first terminal equipment transmits second coordination information to the second terminal equipment to indicate that the first sidelink information needs to be retransmitted, and transmits third coordination information to the third terminal equipment to indicate that the second sidelink information needs to be retransmitted; wherein the priority of the second coordination information is the same as the priority of the first sidelink information, and the priority of the third coordination information is the same as the priority of the second sidelink information.

[0088] It should be noted that FIG. 5 above is merely a schematic description of embodiments of the present disclosure and is not limited thereto. For example, the execution steps of each operation may be appropriately adjusted, and furthermore, some other operations may be increased or decreased. Those skilled in the art are not limited to the descriptions in FIG. 5 above and may make appropriate modifications based on the above.

[0089] In some embodiments, the device may need to transmit coordination information and other information simultaneously. Herein, other information includes sidelink information and / or uplink information such as PSFCH, PUSCH, etc., which are not enumerated. As limited by device capabilities, the device needs to select information of M pieces from information of N pieces to perform transmission (M <N). 디바이스는 정보의 우선순위에 기초하여 어떤 피스의 정보가 최종적으로 송신될지를 결정할 필요가 있다. 사이드링크 정보 및 업링크 정보의 우선순위들은 표준들에서 정의되었다. 조정 정보의 우선순위를 결정하는 방법은 해결될 필요가 있는 문제이다.

[0090] In some embodiments, the first sidelink information includes the first sidelink control information (SCI) and the first physical sidelink sharing channel (PSSCH), and the priority of the first sidelink information is the same as the priority indicated by a field in the first sidelink control information; and the second sidelink information includes the second sidelink control information (SCI) and the second physical sidelink sharing channel (PSSCH), and the priority of the second sidelink information is the same as the priority indicated by a field in the second sidelink control information. For specific fields indicating priority in the SCI, related technologies may be referenced.

[0091] In some embodiments, the resource where the first sidelink information is located and the resource where the second sidelink information is located overlap at least partially in the time domain. In some embodiments, the second terminal equipment is the destination receiving terminal equipment of the third terminal equipment, and the third terminal equipment is the destination receiving terminal equipment of the second terminal equipment. That is, the second terminal equipment and the third terminal equipment are each other's transmitter and receiver, for example, the second terminal equipment transmits PSCCH / PSSCH to the third terminal equipment, and the third terminal equipment transmits another PSCCH / PSSCH to the second terminal equipment.

[0092] FIG. 6 is an exemplary diagram of transmitting coordination information in embodiments of the present disclosure. As illustrated in FIG. 6, device B and device C simultaneously perform transmission on resources 1 and 3 in the same slot, and device B and device C cannot receive sidelink information transmitted by the other party due to half-duplex limitations, i.e., a half-duplex problem occurs.

[0093] Since Device A receives the SCI transmitted by Device B from Resource 1 and the SCI transmitted by Device C from Resource 3, it can be determined that a half-duplex problem has occurred in Device B and Device C, so that coordination information B and coordination information C are transmitted to Device B and Device C, respectively, to notify Device B and Device C to perform retransmission.

[0094] Since the retransmission resources (resources 2 and 4) of device B and device C can be received by the other party, half-duplex problems can be avoided. Since coordination information B and coordination information C are intended to notify device B and device C that a retransmission is being performed, the priorities of coordination information B and coordination information C are the priorities of the PSSCHs of device B and device C, respectively.

[0095] In some embodiments, the second coordination information and the third coordination information are carried by a physical sidelink feedback channel (PSFCH). For example, when the coordination information is used to indicate a retransmission, the PSFCH resource may reuse a PSFCH resource indicating a NACK.

[0096] In some embodiments, the first terminal equipment randomly or pseudo-randomly selects the adjustment information of M pieces from the adjustment information of N pieces and transmits the adjustment information of M pieces, wherein M is smaller than N and both M and N are positive integers. For specific implementations, the embodiments of the fifth aspect described later may also be referenced.

[0097] In some embodiments, the second terminal equipment performs unicast, groupcast, or broadcast sidelink communication. That is, the above embodiments can be applied to any scenario of unicast, groupcast, or broadcast.

[0098] In some embodiments, the second terminal equipment performs sidelink communication of the first groupcast, in which one or more receiving terminal equipment feeds back a non-acknowledgment (NACK) using the same physical sidelink feedback channel (PSFCH) resource. That is, the above embodiments can be applied to groupcast scenarios of HARQ Option 1.

[0099] Each of the above embodiments is merely an example of the embodiments of the present disclosure, but the present disclosure is not limited thereto, and appropriate modifications may also be made based on each of the above embodiments. For example, each of the above embodiments may be used individually, or one or more of the above embodiments may be combined.

[0100] As can be seen from the above embodiments, the priority of the second coordination information is the same as the priority of the first sidelink information, and the priority of the third coordination information is the same as the priority of the second sidelink information. Therefore, the priority of the coordination information can be accurately determined, and when it is determined that the sidelink information is transmitted or discarded based on the priority rule, it can be guaranteed that the priority of transmitting the conflict command matches the priority of the service, and that high-priority service-related information can be transmitted preferentially.

[0101] Examples of the third aspect

[0102] Embodiments of the present disclosure provide a method for coordinating devices described from a first terminal device and a second terminal device. Embodiments of the present disclosure may be combined with embodiments of the first and second aspects or may be implemented separately.

[0103] The method of transmitting coordination information to indicate reselection or retransmission is a problem that needs to be solved. A mechanism similar to PSFCH transmission may be used. More specifically, PSFCH resources for carrying coordination information, such as RBs and sequence (circular shift) resources, are additionally configured or pre-configured in existing PSFCH slots.

[0104] FIG. 7 is an exemplary diagram of a PSFCH in embodiments of the present disclosure. As illustrated in FIG. 7, a PSSCH transmitted by device B is associated with a plurality of PSFCH resources, namely, a PSFCH indicating ACK, a PSFCH indicating NACK (retransmission), and a PSFCH indicating reselection. The PSFCH indicating ACK / NACK may reuse existing standards. The PSFCH indicating reselection may be additionally configured or pre-configured. Regardless of the type of PSFCH, the method of associating the PSSCH with a PSFCH resource may reuse existing standards.

[0105] Assuming that device A is a receiver of device B, device A receives device B's PSCCH / PSSCH, decides to indicate ACK, NACK, or reselect to device B, and transmits the corresponding PSFCH. Assuming that device C is not a receiver of device B, device C may also demodulate device B's PSCCH to detect a collision or half-duplex problem between device B and another device (device D), and decide to indicate reselect or retransmit (NACK) to device B and transmit the corresponding PSFCH.

[0106] When multiple devices transmit a reselection command (or retransmission command) to device B, the transmitted PSFCHs (including time domains, frequency domains, and code domain resources) are identical, forming a symmetrical overlap of multiple identical signals, which can save resource overhead for coordination information. More specifically, the device transmits the PSFCH when it needs to transmit the reselection command and does not transmit the PSFCH when it does not need to transmit the reselection command. Thus, the presence or absence of the PSFCH can indicate whether device B needs to perform resource reselection. Device B can identify the reselection command but cannot identify which device is transmitting the reselection command. In practice, the transmission mechanism for the reselection command corresponds to that of the NACK in a group cast with HARQ option 1, and both indicate information by the presence or absence of the signal.

[0107] However, the above mode creates ambiguity regarding whether Device B performs resource reselection. Consider a group cast with HARQ option 1, i.e., a group cast that feeds back only a NACK (NACK-only). The device (group member) receiving the group cast feeds back only a NACK, not an ACK. The PSFCHs transmitted by the group members to indicate a NACK are identical, forming a simultaneous overlap of multiple identical signals. Assuming Device B transmits the group cast PSSCH, Device B receives both a reselection command and an ACK command in the following two scenarios.

[0108] Scenario 1: All group members indicate ACK (i.e., without feedbacking NACK), and non-group member device A sends a reselection command to device B.

[0109] FIG. 8 is an exemplary diagram illustrating the feedback of PSFCHs in embodiments of the present disclosure. As illustrated in FIG. 8, Device B and Device D belong to the same group and can perform a group cast with HARQ option 1. Device A and Device C do not belong to this group, and Device A can receive PSCCHs / PSSCHs from Device B and Device C and feed back PSFCHs to Device B (e.g., carrying coordination information). For example, as illustrated in FIG. 8, group member Device D and other group members indicate ACK (do not feed back PSFCHs). Non-group member Device A discovers, as illustrated in FIG. 4, that a retransmission reserved by Device B conflicts with Device C. Therefore, Device B is instructed to perform resource reselection. Device B determines that both an ACK and a reselection command appear.

[0110] Scenario 2: All group members indicate to Device B to perform resource reselection. Non-group members do not indicate reselection. Because the group members only send the reselection command and fail to send the NACK, Device B determines that both the ACK and the reselection command are present.

[0111] FIG. 9 is another exemplary diagram illustrating the feedback of PSFCH in embodiments of the present disclosure. As illustrated in FIG. 9, Device B and Device D belong to the same group and can perform a group cast with HARQ option 1. Device A and Device C do not belong to this group, and Device A can receive PSCCHs / PSSCHs from Device B and Device C. For example, as illustrated in FIG. 9, the group member Device D and other group members indicate reselection, while the non-group members do not indicate reselection. Because the group members only transmit a reselection command and do not transmit a NACK, Device B also determines that both an ACK and a reselection command appear.

[0112] In Scenario 1, since all group members provide feedback with an ACK, Device B does not need to perform a retransmission and therefore does not collide with Device C later. In Scenario 1, in practice, Device B is not required to perform resource reselection, and Device B must perform processing based on the ACK. In Scenario 2, since none of the group members successfully demodulate, Device B must perform resource reselection and transmit a retransmission on the reselected resource.

[0113] However, for both scenarios, the observation results from the device B side include both the presence of an ACK and the presence of a reselection command, and device B cannot distinguish which scenario generates these results. Therefore, device B cannot determine whether the results should be processed according to the ACK or the reselection. Incorrect processing causes additional interference to other devices by causing device B to perform unnecessary resource reselection and transmission in Scenario 1, or causes demodulation failure by preventing device B from continuing to transmit retransmissions in Scenario 2.

[0114] Regarding the above problem, the following text is described from the first terminal equipment (device A and / or device D).

[0115] FIG. 10 is a schematic diagram of a method for coordinating devices in embodiments of the present disclosure, and as illustrated in FIG. 10, the method comprises the following:

[0116] 1001, the first terminal equipment receiving sidelink information from the second terminal equipment; and

[0117] 1002, transmitting a reselection command to the second terminal equipment to instruct the first terminal equipment to perform resource reselection of sidelink information and / or acknowledgment (ACK) or non-acknowledgment (NACK), depending on whether the first terminal equipment is the destination terminal equipment of the second terminal equipment.

[0118] It should be noted that FIG. 10 above is merely a schematic description of embodiments of the present disclosure and is not limited thereto. For example, the execution steps of each operation may be appropriately adjusted, and furthermore, some other operations may be increased or decreased. Those skilled in the art are not limited to the descriptions in FIG. 10 above and may make appropriate modifications based on the above.

[0119] In some embodiments, when the first terminal device is the destination terminal device of the second terminal device and the second terminal device needs to perform resource reselection, both a reselection command and a non-acknowledgment (NACK) are transmitted to the second terminal device.

[0120] Under these circumstances, when the priority rule is executed, the reselection command and the non-acknowledgment are taken as feedback information for a single piece and prioritized, and the priority of the feedback information is equal to the highest priority among the priorities of the reselection command and the non-acknowledgment. Here, prioritization is equivalent to deciding whether to transmit information according to priority, that is, deciding whether the information is transmitted or discarded.

[0121] For example, when group member device D in FIG. 8 or FIG. 9 needs to transmit both a reselection command and a NACK, and when device D needs to execute a priority rule to determine which PSFCHs are transmitted or discarded, the reselection command and the NACK are prioritized as a bundle. The priority of this bundle is equal to the highest priority among the priority of the reselection command and the priority of the NACK. When the embodiments of the first aspect above are used, the priority of the reselection command is always higher than the priority of the NACK, and subsequently the priority of the bundle is equal to the priority of the reselection command.

[0122] In some embodiments, when the first terminal equipment is not the destination terminal equipment of the second terminal equipment and the second terminal equipment needs to perform resource reselection, a reselection command is transmitted to the second terminal equipment.

[0123] For example, when non-group member device A of FIG. 8 or FIG. 9 needs to transmit a reselection command, only a PSFCH (reselection instruction) indicating reselection is transmitted to device B.

[0124] Therefore, in Scenario 1, both the ACK and the reselection command appear, and thus Device B processes according to the ACK; in Scenario 2, both the NACK and the reselection command appear, and thus Device B processes according to the reselection. Thus, the problem of not being certain whether Device B needs to perform reselection is resolved.

[0125] In some embodiments, the reselection command is carried by the physical sidelink feedback channel (PSFCH).

[0126] For example, a slot in a physical sidelink feedback channel carrying a reselection command is identical to a slot in a physical sidelink feedback channel carrying an acknowledgment (ACK) or a non-acknowledgment (NACK), and a resource block (RB) and / or sequence in a physical sidelink feedback channel carrying a reselection command is configured or pre-configured and is different from a resource block (RB) and / or sequence in a physical sidelink feedback channel carrying an acknowledgment (ACK) or a non-acknowledgment (NACK).

[0127] As another example, the slot of the physical sidelink feedback channel carrying a reselection command is different from the slot of the physical sidelink feedback channel carrying an acknowledgment (ACK) or a non-acknowledgment (NACK).

[0128] In some embodiments, the second terminal equipment performs sidelink communication of the first group cast, in which the receiving terminal equipment feeds back a non-acknowledgment using the same physical sidelink feedback channel resource. That is, as illustrated in FIG. 8 or FIG. 9, a plurality of devices perform a group cast with HARQ option 1, but the present disclosure is not limited thereto.

[0129] In some embodiments, the second terminal equipment performs unicast, groupcast, or broadcast sidelink communication. That is, the above embodiments can be applied to any scenario of unicast, groupcast, or broadcast.

[0130] The following text is further explained from the second terminal equipment (Device B).

[0131] As illustrated in FIG. 10, the second terminal equipment transmits sidelink information; and receives a reselection command to instruct to perform resource reselection and / or acknowledgment (ACK) or non-acknowledgment (NACK) of the sidelink information transmitted from one or more first terminal equipment.

[0132] In some embodiments, the second terminal equipment determines a non-acknowledgment (NACK) or non-continuous transmission (DTX) and performs resource reselection when it receives a reselection command.

[0133] In some embodiments, when determined as an acknowledgment (ACK), the second terminal equipment determines that the sidelink information is received correctly. Accordingly, if the first terminal equipment decides to send an acknowledgment (ACK) to the second terminal equipment and is unable to cancel the transmission of the ACK due to a priority rule, the first terminal equipment may indicate that the second terminal equipment does not need to perform resource reselection.

[0134] In some embodiments, the second terminal equipment determines that the sidelink information is not received correctly when it is determined as a non-acknowledgment (NACK) or non-continuous transmission (DTX) but a reselection command is not received.

[0135] For example, device B, as illustrated in FIG. 8 or FIG. 9, determines whether to ACK or NACK according to existing standards. If the result of the determination is ACK, device B performs processing according to the ACK regardless of whether there is a reselection command, for example, performs operations such as flushing the buffer; if the result of the determination is NACK and no reselection command is received, device B performs processing according to the NACK, for example, transmits a retransmission; and if the result of the determination is NACK and a reselection command is received, device B performs resource reselection.

[0136] Therefore, in Scenario 1, both the ACK and the reselection command appear, and thus Device B processes according to the ACK; in Scenario 2, both the NACK and the reselection command appear, and thus Device B processes according to the reselection. Thus, the problem of not being certain whether Device B needs to perform reselection is resolved.

[0137] Each of the above embodiments is merely an example of the embodiments of the present disclosure, but the present disclosure is not limited thereto, and appropriate modifications may also be made based on each of the above embodiments. For example, each of the above embodiments may be used individually, or one or more of the above embodiments may be combined.

[0138] As can be seen from the above embodiments, depending on whether the first terminal equipment is the destination terminal equipment of the second terminal equipment, the first terminal equipment transmits a reselection command and / or an ACK / NACK. Accordingly, the creation of ambiguity when a device receiving the reselection command identifies the ACK / NACK and the reselection command can be avoided, and the reliability of the sidelink transmission can be improved.

[0139] Examples of the fourth aspect

[0140] Embodiments of the present disclosure provide a method for coordinating devices described from a first terminal device and a second terminal device. Embodiments of the present disclosure may be combined with embodiments of the first and second embodiments or may be implemented separately. Unlike embodiments of the third embodiment, embodiments of the fourth embodiment are determined by resources, and the same contents as those of the embodiments of the third embodiment are not repeated.

[0141] The following text still takes the scenarios of FIGS. 8 and FIG. 9 as examples and describes the first terminal equipment (device A and / or device D).

[0142] FIG. 11 is a schematic diagram of a method for coordinating devices in embodiments of the present disclosure, and as illustrated in FIG. 11, the method comprises the following:

[0143] 1101, the first terminal equipment receiving sidelink information from the second terminal equipment; and

[0144] 1102, the first terminal equipment transmits a reselection command to the second terminal equipment to instruct it to perform resource reselection using the first resource or the second resource, depending on whether the first terminal equipment is the destination terminal equipment of the second terminal equipment.

[0145] It should be noted that FIG. 11 above is merely a schematic description of embodiments of the present disclosure and is not limited thereto. For example, the execution steps of each operation may be appropriately adjusted, and furthermore, some other operations may be increased or decreased. Those skilled in the art are not limited to the descriptions in FIG. 11 above and may make appropriate modifications based on the above.

[0146] In some embodiments, when the first terminal equipment is the destination terminal equipment of the second terminal equipment and the second terminal equipment needs to perform resource reselection, a reselection command is transmitted to the second terminal equipment using the first resource.

[0147] In some embodiments, the first resource is a physical sidelink feedback channel (PSFCH) resource.

[0148] For example, a slot of a first resource carrying a reselection command is identical to a slot of a physical sidelink feedback channel carrying an acknowledgment (ACK) or a non-acknowledgment (NACK), and a resource block (RB) and / or sequence of the first resource carrying the reselection command is configured or pre-configured and is different from a resource block (RB) and / or sequence of a physical sidelink feedback channel carrying an acknowledgment (ACK) or a non-acknowledgment (NACK).

[0149] As another example, the slot of the first resource carrying a reselection command is different from the slot of the physical sidelink feedback channel carrying an acknowledgment (ACK) or a non-acknowledgment (NACK).

[0150] In some embodiments, when the first terminal equipment is not the destination terminal equipment of the second terminal equipment and the second terminal equipment needs to perform resource reselection, a reselection command is transmitted to the second terminal equipment using the second resource.

[0151] In some embodiments, the second resource is different from the first resource.

[0152] In some embodiments, the second resource is a physical sidelink feedback channel (PSFCH) resource.

[0153] For example, a slot of a second resource carrying a reselection command is identical to a slot of a physical sidelink feedback channel carrying an acknowledgment (ACK) or a non-acknowledgment (NACK), and a resource block (RB) and / or sequence of a second resource carrying a reselection command is configured or pre-configured and is different from a resource block (RB) and / or sequence of a physical sidelink feedback channel carrying an acknowledgment (ACK) or a non-acknowledgment (NACK).

[0154] As another example, the slot of the second resource carrying a reselection command is different from the slot of the physical sidelink feedback channel carrying an acknowledgment (ACK) or a non-acknowledgment (NACK).

[0155] In some embodiments, when the first terminal device is the destination terminal device of the second terminal device and the second terminal device needs to perform resource reselection, the first terminal device sends a reselection command to the second terminal device using the first resource and skips sending a NACK to the second terminal device, that is, does not send a NACK to the second terminal device.

[0156] For example, when the first terminal device is a receiver of the second terminal device and it is determined that a reselection command needs to be transmitted, this means that the demodulation result of the first terminal device is NACK. In this case, the first terminal device can transmit only the reselection command and does not transmit the NACK. This is because the second terminal device performs resource reselection as long as it receives the reselection command from the receiver. Conversely, if the demodulation result of the first terminal device is ACK, the first terminal device decides that it does not need to transmit the reselection command to the second terminal device. This is because the second terminal device does not need to transmit a retransmission after receiving the ACK, and therefore does not need to perform reselection. In this case, the first terminal device transmits only the ACK according to the conventional method.

[0157] FIG. 12 is another exemplary diagram of a PSFCH in embodiments of the present disclosure. As shown in FIG. 12, a receiving device of device B transmits a reselection command using a first PSFCH, and a non-receiving device of device B transmits a reselection command using a second PSFCH. Thus, device B can determine, based on the first PSFCH and the second PSFCH, whether it is a reselection indicated by its own receiving device or a reselection indicated by its non-receiving device.

[0158] Therefore, in Scenario 1, Device B knows that all receiving devices indicate ACK (that they do not indicate reselection) and that non-receiving devices indicate reselection, so Device B performs processing according to the ACK; in Scenario 2, Device B knows that the receiving devices indicate reselection, and therefore Device B performs processing according to reselection. Thus, the problem that Device B cannot be certain whether to perform reselection is resolved.

[0159] In some embodiments, the first and second resources are physical sidelink feedback channel (PSFCH) resources, and the slot of the first resource is identical to that of the second resource; the resource blocks (RB) and / or sequences of the first and second resources are configured or pre-configured, and the resource blocks (RB) or sequences of the first and second resources are different.

[0160] For example, the first PSFCH and the second PSFCH are transmitted using different RB resources, and multiple first PSFCHs transmitted by different receiving devices are identical and therefore overlap in the same direction on the same time-frequency resource. Multiple second PSFCHs transmitted by different non-receiving devices are identical and therefore overlap in the same direction on the same time-frequency resource.

[0161] In some embodiments, the second terminal equipment performs sidelink communication of the first group cast, in which the receiving terminal equipment feeds back a non-acknowledgment using the same physical sidelink feedback channel resource. That is, as illustrated in FIG. 8 or FIG. 9, a plurality of devices perform a group cast with HARQ option 1, but the present disclosure is not limited thereto.

[0162] In some embodiments, the second terminal equipment performs unicast, groupcast, or broadcast sidelink communication. That is, the above embodiments can be applied to any scenario of unicast, groupcast, or broadcast.

[0163] The following text is further explained from the second terminal equipment (Device B).

[0164] As illustrated in FIG. 11, the second terminal equipment transmits sidelink information; receives an acknowledgment (ACK) or non-acknowledgment (NACK) of the sidelink information transmitted by one or more first terminal equipment, and / or the first terminal equipment transmits a reselection command to instruct to perform resource reselection using the first resource and / or the second resource.

[0165] In some embodiments, if it is determined as an acknowledgment (ACK) and a reselection command is not received on the first resource, the second terminal equipment determines that the sidelink information is received correctly.

[0166] In some embodiments, the second terminal equipment determines that the sidelink information is not received correctly if it is determined as a non-acknowledgment (NACK) or non-continuous transmission (DTX) and the reselection command is not received from both the first resource and the second resource.

[0167] In some embodiments, the second terminal equipment performs resource reselection when it is determined as an acknowledgment and a reselection command is received on the first resource, or when it is determined as a non-acknowledgment or DTX and a reselection command is received on the first resource or the second resource. Accordingly, when the first terminal equipment is the destination terminal equipment of the second terminal equipment and the second terminal equipment needs to perform resource reselection, the first terminal equipment sends a reselection command to the second terminal equipment using the first resource and skips sending a NACK to the second terminal equipment.

[0168] Therefore, in Scenario 1, Device B knows that all receiving devices indicate ACK (that they do not indicate reselection) and that non-receiving devices indicate reselection, so Device B performs processing according to the ACK; in Scenario 2, Device B knows that the receiving devices indicate reselection, and therefore Device B performs processing according to reselection. Thus, the problem that Device B cannot be certain whether to perform reselection is resolved.

[0169] Each of the above embodiments is merely an example of the embodiments of the present disclosure, but the present disclosure is not limited thereto, and appropriate modifications may also be made based on each of the above embodiments. For example, each of the above embodiments may be used individually, or one or more of the above embodiments may be combined.

[0170] As can be seen from the above embodiment, depending on whether the first terminal equipment is the destination terminal equipment of the second terminal equipment, the first terminal equipment transmits a reselection command using the first resource or the second resource. Accordingly, the creation of ambiguity when the device receiving the reselection command identifies the ACK / NACK and the reselection command can be avoided, and the reliability of the sidelink transmission can be improved.

[0171] Examples of the fifth aspect

[0172] Embodiments of the present disclosure provide a method for coordinating devices described from a first terminal device and a second terminal device. Embodiments of the present disclosure may be combined with embodiments of the first through fourth embodiments or may be implemented separately. The same contents as embodiments of the first through fourth embodiments are not repeated.

[0173] In some embodiments, when the first terminal equipment decides to send an acknowledgment (ACK) to the second terminal equipment and is unable to cancel the transmission of the ACK due to a priority rule, the first terminal equipment indicates that the second terminal equipment does not need to perform resource reselection.

[0174] For example, the slot for indicating whether to perform resource reselection is located in the same slot as for transmitting ACK / NACK, or the slot for indicating whether to perform resource reselection is located in a different slot than for transmitting ACK / NACK. For example, the slot for indicating whether to perform resource reselection is located in a slot after the slot for transmitting ACK / NACK.

[0175] In the case of non-first group cast sidelink communication performed by the second terminal equipment, if the first terminal equipment decides to send an ACK to the second terminal equipment and cannot cancel the ACK transmission due to a priority rule, the first terminal equipment indicates that the second terminal equipment does not need to perform resource reselection (e.g., not sending a resource reselection command); otherwise (including sending a NACK from the first terminal equipment to the second terminal equipment, and / or canceling the ACK or NACK transmission due to a priority rule), the first terminal equipment indicates to the second terminal equipment whether to perform resource reselection based on the actual situation.

[0176] According to priority rules, terminal equipment may transmit physical channels or signals with high priority and does not transmit physical channels or signals with low priority. For specific priority rules, refer to Section 16.2.4 of TS 38.213; wherein non-first group casts include unicasts with ACK / NACK enabled and group casts with HARQ option 2.

[0177] In the case of a first group cast sidelink communication performed by a second terminal device, if the first terminal device decides to transmit an ACK to the second terminal device, the first terminal device does not use PSFCH to transmit any signal, so there is no cancellation of the ACK transmission due to priority rules, and the first terminal device indicates that the second terminal device does not need to perform resource reselection; otherwise (including transmitting a NACK from the first terminal device to the second terminal device, and / or canceling the NACK transmission due to priority rules), the first terminal device indicates to the second terminal device whether to perform resource reselection based on actual circumstances.

[0178] Tables 1 and 2 summarize the relationship between the ACK / NACK and reselection commands of the first terminal equipment when the second terminal equipment performs sidelink communication of the non-first group cast and the first group cast, respectively.

[0179] Table 1 Non-1st group cast

[0180] ACK / NACK Reselect command Determine the ACK and send the ACK Indicates that resource reselection is not performed Determine NACK and send NACK Indicate whether to perform resource reselection. Determine the ACK, and cancel the transmission of the ACK due to the priority rule. Indicate whether to perform resource reselection. Determine the NACK and cancel the transmission of the NACK due to the priority rule. Indicate whether to perform resource reselection.

[0181] Table 2 Group 1 cast

[0182] ACK / NACK Reselect command Determine the ACK and transmit (indicate) the ACK Indicates that resource reselection is not performed Determine NACK and send NACK Indicate whether to perform resource reselection. Determine the NACK and cancel the transmission of the NACK due to the priority rule. Indicate whether to perform resource reselection.

[0183] The methods described in Tables 1 and 2 have the following beneficial effects: since the second terminal equipment does not perform retransmission after the first terminal equipment transmits or indicates an ACK, the first terminal equipment does not need to transmit a reselection command, thereby saving power on the one hand, but also avoiding the occurrence of priority rule-based discarding, and more specifically, avoiding the transmission or reception of other useful physical channels or signals due to the transmission of meaningless reselection commands.

[0184] In the case of a non-first group cast, after the ACK or NACK transmission is canceled, the second terminal equipment determines that it is DTX and accordingly still performs retransmission, and the first terminal equipment indicates whether to perform resource reselection, thereby further avoiding collisions of the second terminal equipment during retransmission.

[0185] In the case of a first group cast, after the NACK transmission is canceled, the second terminal device may incorrectly determine that it is an ACK and therefore stop retransmission. For example, a group member device scheduled to transmit a NACK cancels the transmission of the NACK based on a priority rule, while other group member devices indicate an ACK to the second terminal device, and the second terminal device incorrectly determines that it is an ACK. The first terminal device indicates whether to perform resource reselection, and the second terminal device still has an opportunity to know that it is necessary to perform retransmission and resource reselection. For example, even if the second terminal device receives a reselection command from a group member with the incorrect determination that it is an ACK, the second terminal device can still perform retransmission and resource reselection.

[0186] The methods shown in Tables 1 and 2 are applicable to the embodiments of the above aspects. For example, in the case of the embodiments of the third aspect, it is possible to change the last line of Table 2, "indicate whether to perform resource reselection," to "indicate whether to perform resource reselection, or indicate that resource reselection is not performed." This is because the second terminal equipment in the embodiments of the third aspect does not always perform resource reselection after it determines that it is ACK. Therefore, it can directly instruct the first terminal equipment that resource reselection is not performed.

[0187] The following text is further explained from the second terminal equipment (Device B).

[0188] As illustrated in FIG. 11, the second terminal equipment transmits sidelink information; receives an acknowledgment (ACK) or non-acknowledgment (NACK) of the sidelink information transmitted by one or more first terminal equipment, and / or the first terminal equipment transmits a reselection command to instruct to perform resource reselection using the first resource and / or the second resource.

[0189] In some embodiments, when it is determined as an acknowledgment (ACK) and a reselection command is not received on the first resource, the second terminal equipment determines that the sidelink information is received correctly. Accordingly, when the first terminal equipment decides to send an acknowledgment (ACK) to the second terminal equipment and is unable to cancel the transmission of the ACK due to a priority rule, the first terminal equipment may indicate that the second terminal equipment does not need to perform resource reselection.

[0190] In some embodiments, the second terminal equipment determines that the sidelink information is not received correctly if it is determined as a non-acknowledgment (NACK) or non-continuous transmission (DTX) and the reselection command is not received from both the first resource and the second resource.

[0191] In some embodiments, the second terminal equipment performs resource reselection when it is determined as an acknowledgment and a reselection command is received on the first resource, or when it is determined as a non-acknowledgment or DTX and a reselection command is received on the first resource or the second resource. Accordingly, if the first terminal equipment decides to send an acknowledgment (ACK) to the second terminal equipment and cannot cancel the transmission of the ACK due to a priority rule, the first terminal equipment may indicate that the second terminal equipment does not need to perform resource reselection.

[0192] Therefore, in Scenario 1, Device B knows that all receiving devices indicate ACK (that they do not indicate redo), and since non-receiving devices indicate redo, Device B performs processing according to the ACK; in Scenario 2, Device B knows that the receiving devices indicate redo, and thus Device B performs processing according to redo. Thus, the problem of not being certain whether Device B needs to perform redo is resolved.

[0193] Each of the above embodiments is merely an example of the embodiments of the present disclosure, but the present disclosure is not limited thereto, and appropriate modifications may also be made based on each of the above embodiments. For example, each of the above embodiments may be used individually, or one or more of the above embodiments may be combined.

[0194] As can be seen from the above embodiments, since the second terminal equipment does not perform retransmission after the first terminal equipment transmits or indicates an ACK, the first terminal equipment does not need to transmit a reselection command, so power can be saved on one hand, but the occurrence of priority rule-based discarding can also be avoided.

[0195] Examples of the 6th aspect

[0196] Embodiments of the present disclosure provide a method for coordinating devices described from a first terminal device. Embodiments of the present disclosure may be combined with embodiments of the first through fifth embodiments or may be implemented separately.

[0197] As illustrated in FIG. 6, a half-duplex problem may occur in devices B and C. If device A detects that a half-duplex problem occurs in devices B and C, device A may notify devices B and C to perform a retransmission or reselection by sending a retransmission or reselection command to devices B and C to avoid the half-duplex problem.

[0198] FIG. 13 is an exemplary diagram illustrating the transmission of coordination information in embodiments of the present disclosure, and schematic examples are provided using HARQ Option 1 as an example. As illustrated in FIG. 13, in the same slot where group member device B transmits a group cast, group member device C also simultaneously transmits a group cast. Consequently, devices B and C cannot receive information transmitted from each other and do not provide feedback on ACK / NACK. Furthermore, it is assumed that the PSSCHs of devices B and C can be successfully demodulated by other group member devices within the group. If there is no coordination between the devices, devices B and C determine that an ACK has occurred, and thereby subsequent retransmission is stopped.

[0199] During device coordination, group member device A receives the PSCCHs / PSSCHs of devices B and C and may detect a half-duplex issue. Regardless of whether device A can properly demodulate the PSSCHs of devices B and C, device A transmits a NACK on the PSFCH_B and PSFCH_C resources associated with devices B and C, respectively. Both device B and device C can receive the NACK and thus perform a retransmission. Since no half-duplex issue occurs for the retransmission, the retransmission has a chance to be correctly received by devices C and B. The above method can resolve the half-duplex issue, but device A needs to transmit multiple PSFCHs (PSFCH_B and PSFCH_C) simultaneously in the same slot.

[0200] Solving the half-duplex problem requires a device to transmit N PSFCHs simultaneously, but it is assumed that the device can only transmit M (M < N) PSFCHs simultaneously due to device capabilities. Priority rules are defined in standards for this situation, and M PSFCHs with higher priority are transmitted. However, while this allows only high-priority PSSCHs to resolve the half-duplex problem through retransmission, the half-duplex problem for low-priority PSSCHs remains unresolved.

[0201] FIG. 14 is another exemplary diagram of transmitting coordination information in embodiments of the present disclosure, and its scenario assumptions are the same as those in FIG. 13. Assuming that Device A can transmit only one PSFCH and that Device B's PSSCH (PSFCH) priority is higher than Device C's, Device A transmits only PSFCH_B to indicate to Device B that it should retransmit. Even if other group member devices other than Device A also observe a half-duplex problem, the other devices may transmit PSFCH only to Device B to indicate a NACK based on existing priority rules. Therefore, Device B's PSSCH can be recovered through retransmission, but Device C's PSSCH cannot always be recovered.

[0202] In some embodiments, the first terminal equipment randomly or pseudo-randomly selects adjustment information of M pieces from adjustment information of N pieces and transmits adjustment information of M pieces; where M is smaller than N, and M and N are both positive integers.

[0203] For example, to indicate that the device has a half-duplex problem or to indicate retransmission, M pieces (M) from N pieces of coordination information for transmission <N) 피스의 조정 정보를 선택할 필요가 있는 경우, 디바이스는 무작위 또는 의사-무작위 방식으로 송신을 위해 M 피스의 조정 정보를 선택한다. 상기 조정 정보는 PSFCH 또는 다른 캐리어들을 통해 송신될 수 있다. 따라서, 상이한 디바이스들은 모든 반이중 문제를 표시할 더 큰 확률을 갖는 상이한 M 피스의 조정 정보를 송신할 수 있다.

[0204] FIG. 15 is another exemplary drawing of transmitting coordination information in embodiments of the present disclosure, and its scenario assumptions are the same as those for FIG. 13 and FIG. 14. As illustrated in FIG. 15, it is assumed that both devices A and D discover a half-duplex problem. If device A transmits only one PSFCH to device B and device D transmits only one PSFCH to device C, both devices B and C can perform subsequent retransmissions and recover from the half-duplex problem.

[0205] The transmission of the above retransmission command is caused by the occurrence of a half-duplex problem, and the transmission of the retransmission command can also be caused by a NACK. For example, for device A to perform a transmission, M(M from N NACKs <N)개의 NACK를 선택할 필요가 있다면, 디바이스 A는 또한 무작위 또는 의사-무작위 방식으로 송신을 수행하기 위해 M개의 NACK를 선택할 수 있다.

[0206] In some embodiments, the second terminal equipment performs unicast, groupcast, or broadcast sidelink communication. That is, the above embodiments can be applied to any scenario of unicast, groupcast, or broadcast.

[0207] In some embodiments, the second terminal equipment performs sidelink communication of the first groupcast using the same physical sidelink feedback channel resource (PSFCH) for receiving terminal equipment to feed back a non-acknowledgment (NACK). That is, the above embodiments can be applied to groupcast scenarios of HARQ Option 1.

[0208] Each of the above embodiments is merely an example of the embodiments of the present disclosure, but the present disclosure is not limited thereto, and appropriate modifications may also be made based on each of the above embodiments. For example, each of the above embodiments may be used individually, or one or more of the above embodiments may be combined.

[0209] As can be seen from the above embodiments, the first terminal equipment randomly or pseudo-randomly selects the adjustment information of M pieces from the adjustment information of N pieces and transmits the adjustment information of M pieces. Accordingly, during device adjustment, it is possible to avoid the adjustment device transmitting adjustment information only to devices having high priority services, and it is possible to avoid the inability of devices having low priority services to obtain device adjustment.

[0210] Examples of the seventh aspect

[0211] Embodiments of the present disclosure provide a method for coordinating devices described from a first terminal device. Embodiments of the present disclosure may be combined with embodiments of the first through sixth embodiments or may be implemented separately.

[0212] If any device can transmit coordination information to indicate retransmission or reselection, the coordination information is not sufficiently accurate.

[0213] FIG. 16 is an exemplary diagram of transmitting coordination information in embodiments of the present disclosure. For example, as shown in FIG. 16, device A is not a receiver of devices B and C, but device A discovers that a collision problem shown in FIG. 4 occurs in devices B and C, and therefore notifies device B to perform resource reselection.

[0214] However, the receiver devices E and D of devices B and C may be far apart from each other, and the actual interference (collision) at devices E and D is small, so devices E and D can achieve accurate demodulation, and device B does not actually need to perform resource reselection.

[0215] To solve this problem, restrictions can be imposed on the device capable of transmitting coordination information.

[0216] In some embodiments, the first terminal equipment receives first sidelink information from the second terminal equipment and second sidelink information from the third terminal equipment; and according to the first sidelink information and the second sidelink information, the first terminal equipment determines that the first resource reserved by the first sidelink information needs to be re-selected;

[0217] If the first terminal equipment is the destination receiving terminal equipment of the second terminal equipment, or if the first terminal equipment is not the destination receiving terminal equipment of the second terminal equipment but the first terminal equipment is the destination receiving terminal equipment of the third terminal equipment, the first terminal equipment transmits first coordination information to the second terminal equipment to indicate that the first resource needs to be re-selected.

[0218] FIG. 17 is another exemplary illustration of transmitting coordination information in embodiments of the present disclosure. For example, as illustrated in FIG. 17, if device A detects that there is a collision between device B and device C, device A may transmit coordination information to device B to notify device B to perform resource reselection only when device A is a receiver of device C. Device A is a receiver of device C, and the collision observed by device A is an actual collision, thereby avoiding the transmission of inaccurate coordination information.

[0219] In some embodiments, the second terminal equipment performs unicast, groupcast, or broadcast sidelink communication. That is, the above embodiments can be applied to any scenario of unicast, groupcast, or broadcast.

[0220] In some embodiments, the second terminal equipment performs sidelink communication of the first groupcast using the same physical sidelink feedback channel resource (PSFCH) for receiving terminal equipment to feed back a non-acknowledgment (NACK). That is, the above embodiments can be applied to groupcast scenarios of HARQ Option 1.

[0221] Each of the above embodiments is merely an example of the embodiments of the present disclosure, but the present disclosure is not limited thereto, and appropriate modifications may also be made based on each of the above embodiments. For example, each of the above embodiments may be used individually, or one or more of the above embodiments may be combined.

[0222] As can be seen from the above embodiments, if the first terminal equipment is the destination receiving terminal equipment of the second terminal equipment, or if the first terminal equipment is not the destination receiving terminal equipment of the second terminal equipment but the first terminal equipment is the destination receiving terminal equipment of the third terminal equipment, the first terminal equipment transmits first coordination information to the second terminal equipment to indicate that the first resource needs to be re-selected. Accordingly, the transmission of inaccurate coordination information can be avoided, and the reliability of sidelink transmission can be improved.

[0223] Examples of the eighth aspect

[0224] Embodiments of the present disclosure provide a device-to-device coordination device. The device may be, for example, a terminal device (such as the first terminal device mentioned above) or one or more parts or components configured on the terminal device. The same contents as the embodiments of the first through seventh aspects are not repeated.

[0225] FIG. 18 is a schematic diagram of a device-to-device coordination device in embodiments of the present disclosure. As shown in FIG. 18, the device-to-device coordination device (1800) is:

[0226] A receiving unit (1801) configured to receive first side link information from a second terminal device and second side link information from a third terminal device;

[0227] A decision unit (1802) configured to determine, based on the first side link information and the second side link information, that the first resource reserved by the first side link information needs to be re-selected; and

[0228] A transmitting unit (1803) configured to transmit first coordination information to a second terminal device to indicate that a first resource needs to be re-selected—the priority of the first coordination information is the same as the highest priority among the priority of the first sidelink information and the priority of the second sidelink information—is included.

[0229] In some embodiments, the first side link information includes the first side link control information and the first physical side link sharing channel, and the priority of the first side link information is the same as the priority indicated by the field in the first side link control information; and the second side link information includes the second side link control information and the second physical side link sharing channel, and the priority of the second side link information is the same as the priority indicated by the field in the second side link control information.

[0230] In some embodiments, the first resource reserved by the first sidelink control information and the second resource reserved by the second sidelink control information overlap at least partially in the time domain and the frequency domain.

[0231] In some embodiments, the first adjustment information is carried by a physical sidelink feedback channel.

[0232] In some embodiments, the first terminal equipment is the destination receiving terminal equipment of the second terminal equipment; and the first terminal equipment is not the destination receiving terminal equipment of the second terminal equipment, but the first terminal equipment is the destination receiving terminal equipment of the third terminal equipment.

[0233] In some embodiments, the second terminal equipment performs unicast, groupcast, or broadcast sidelink communication.

[0234] In some embodiments, the decision unit (1802) is further configured to determine, based on the first sidelink information and the second sidelink information, that the first sidelink information and the second sidelink information need to be retransmitted;

[0235] The transmitting unit (1803) is further configured to transmit second coordination information to a second terminal device to indicate that the first sidelink information needs to be retransmitted, and to transmit third coordination information to a third terminal device to indicate that the second sidelink information needs to be retransmitted; wherein the priority of the second coordination information is the same as the priority of the first sidelink information, and the priority of the third coordination information is the same as the priority of the second sidelink information.

[0236] In some embodiments, the first side link information includes the first side link control information and the first physical side link sharing channel, and the priority of the first side link information is the same as the priority indicated by the field in the first side link control information; and the second side link information includes the second side link control information and the second physical side link sharing channel, and the priority of the second side link information is the same as the priority indicated by the field in the second side link control information.

[0237] In some embodiments, the resource where the first sidelink information is located and the resource where the second sidelink information is located overlap at least partially in the time domain.

[0238] In some embodiments, the second terminal equipment is the destination receiving terminal equipment of the third terminal equipment, and the third terminal equipment is the destination receiving terminal equipment of the second terminal equipment.

[0239] In some embodiments, the second adjustment information and the third adjustment information are carried by a physical sidelink feedback channel.

[0240] In some embodiments, the transmitting unit (1803) is further configured to randomly or pseudo-randomly select adjustment information of M pieces from adjustment information of N pieces and transmit adjustment information of M pieces; wherein M is smaller than N, and M and N are both positive integers.

[0241] Each of the above embodiments is merely an example of the embodiments of the present disclosure, but the present disclosure is not limited thereto, and appropriate modifications may also be made based on each of the above embodiments. For example, each of the above embodiments may be used individually, or one or more of the above embodiments may be combined.

[0242] It is worth noting that while only the components or modules related to the present disclosure are described above, the present disclosure is not limited thereto. The inter-device coordination device (1800) may additionally include other components or modules. For details regarding these components or modules, related technologies may be referenced.

[0243] Furthermore, for the sake of simplification, FIG. 18 illustrates the connection relationships or signal directions between components or modules merely as an example, but those skilled in the art should be aware that various related technologies, such as bus connections, may be used. The above components or modules may be realized by hardware equipment such as processors, memory, transmitters, and receivers. Embodiments of the present disclosure are not limited thereto.

[0244] As can be seen from the above embodiments, the priority of coordination information can be accurately determined, and when it is determined that sidelink information is transmitted or discarded based on priority rules, it can be guaranteed that the priority of transmitting conflict commands matches the priority of the service, and that high-priority service-related information can be transmitted preferentially.

[0245] Examples of the ninth aspect

[0246] Embodiments of the present disclosure provide a device-to-device coordination device. The device may be, for example, a terminal device (such as the first terminal device mentioned above) or one or more parts or components configured on the terminal device. The same contents as the embodiments of the first through eighth aspects are not repeated.

[0247] FIG. 19 is a schematic diagram of a device-to-device coordination device in embodiments of the present disclosure. As shown in FIG. 19, the device-to-device coordination device (1900) includes a receiving unit (1901) and a transmitting unit (1902).

[0248] In some embodiments, the receiving unit (1901) receives sidelink information from the second terminal equipment; and the transmitting unit (1902) transmits a reselection command to the second terminal equipment to instruct it to perform resource reselection and / or acknowledgment or non-acknowledgment of the sidelink information, depending on whether the first terminal equipment is the destination terminal equipment of the second terminal equipment.

[0249] In some embodiments, when the first terminal equipment is the destination terminal equipment of the second terminal equipment and the second terminal equipment needs to perform resource reselection, both the reselection command and the non-acknowledgment are transmitted to the second terminal equipment.

[0250] In some embodiments, when the priority rule is executed, the reselection command and the non-acknowledgment are taken as feedback information of one piece and prioritized, and the priority of the feedback information is the same as the highest priority among the priorities of the reselection command and the non-acknowledgment.

[0251] In some embodiments, when the first terminal equipment is not the destination terminal equipment of the second terminal equipment and the second terminal equipment needs to perform resource reselection, a reselection command is transmitted to the second terminal equipment.

[0252] In some embodiments, a reselection instruction is carried by a physical sidelink feedback channel, and the slot of the physical sidelink feedback channel carrying the reselection instruction is the same as the slot of the physical sidelink feedback channel carrying an acknowledgment or a non-acknowledgment, and the resource block and / or sequence of the physical sidelink feedback channel carrying the reselection instruction is configured or pre-configured and is different from the resource block or sequence of the physical sidelink feedback channel carrying the acknowledgment or a non-acknowledgment. Or, the slot of the physical sidelink feedback channel carrying the reselection instruction is different from the slot of the physical sidelink feedback channel carrying an acknowledgment or a non-acknowledgment.

[0253] In some embodiments, the receiving unit (1901) receives sidelink information from the second terminal equipment; and the transmitting unit (1902) transmits a reselection command to the second terminal equipment to instruct it to perform resource reselection using the first resource or the second resource, depending on whether the first terminal equipment is the destination terminal equipment of the second terminal equipment.

[0254] In some embodiments, when the first terminal equipment is the destination terminal equipment of the second terminal equipment and the second terminal equipment needs to perform resource reselection, a reselection command is transmitted to the second terminal equipment using the first resource.

[0255] In some embodiments, when the first terminal equipment is not the destination terminal equipment of the second terminal equipment and the second terminal equipment needs to perform resource reselection, a reselection command is transmitted to the second terminal equipment using the second resource.

[0256] Each of the above embodiments is merely an example of the embodiments of the present disclosure, but the present disclosure is not limited thereto, and appropriate modifications may also be made based on each of the above embodiments. For example, each of the above embodiments may be used individually, or one or more of the above embodiments may be combined.

[0257] It is worth noting that while only the components or modules related to the present disclosure are described above, the present disclosure is not limited thereto. The inter-device coordination device (1900) may additionally include other components or modules. For details regarding these components or modules, related technologies may be referenced.

[0258] Furthermore, for the sake of simplification, FIG. 19 illustrates the connection relationships or signal directions between components or modules merely as examples, but those skilled in the art should be aware that various related technologies, such as bus connections, may be used. The above components or modules may be realized by hardware equipment such as processors, memory, transmitters, and receivers. Embodiments of the present disclosure are not limited thereto.

[0259] As can be seen from the above embodiments, the creation of ambiguity when a device receiving a reselection command identifies ACK / NACK and a reselection command can be avoided, and the reliability of sidelink transmission can be improved.

[0260] Examples of the 10th aspect

[0261] Embodiments of the present disclosure further provide a communication system, and reference may be made to FIG. 1, and the same contents as embodiments of the first through ninth embodiments are not repeated.

[0262] In some embodiments, the communication system (100) is at least:

[0263] A first terminal device configured to receive first sidelink information from a second terminal device and second sidelink information from a third terminal device; determine, based on the first sidelink information and the second sidelink information, that a first resource reserved by the first sidelink information needs to be re-selected; and transmit first coordination information to the second terminal device to indicate that the first resource needs to be re-selected—the priority of the first coordination information is the same as the highest priority among the priority of the first sidelink information and the priority of the second sidelink information—may include

[0264] In some embodiments, the communication system (100) is at least:

[0265] A first terminal device configured to receive first side-link information from a second terminal device and second side-link information from a third terminal device; determine that the first side-link information and the second side-link information need to be retransmitted according to the first side-link information and the second side-link information; transmit second coordination information to the second terminal device to indicate that the first side-link information needs to be retransmitted, and transmit third coordination information to the third terminal device to indicate that the second side-link information needs to be retransmitted—where the priority of the second coordination information is the same as the priority of the first side-link information, and the priority of the third coordination information is the same as the priority of the second side-link information—may include

[0266] In some embodiments, the communication system (100) is at least:

[0267] A first terminal equipment configured to receive sidelink information from a second terminal equipment; and to transmit a reselection command to the second terminal equipment to instruct the reselection and / or acknowledgment (ACK) or non-acknowledgment (NACK) of the sidelink information to be performed, depending on whether the first terminal equipment is the destination terminal equipment of the second terminal equipment;

[0268] It may include a second terminal device configured to transmit sidelink information; and to receive a reselection command for instructing to perform resource reselection and / or acknowledgment (ACK) or non-acknowledgment (NACK) of the sidelink information transmitted from one or more first terminal devices.

[0269] In some embodiments, the communication system (100) is at least:

[0270] A first terminal equipment configured to receive sidelink information from a second terminal equipment; and to transmit a reselection command to the second terminal equipment to instruct to perform resource reselection using a first resource or a second resource, depending on whether the first terminal equipment is the destination terminal equipment of the second terminal equipment; and

[0271] It may include a second terminal device configured to transmit sidelink information; receive an acknowledgment (ACK) or non-acknowledgment (NACK) of the sidelink information transmitted by one or more first terminal devices, and / or the first terminal device transmit a reselection command to instruct the first terminal device to perform resource reselection using a first resource and / or a second resource.

[0272] In some embodiments, the communication system (100) is at least:

[0273] It may include a first terminal device configured to randomly or pseudo-randomly select adjustment information of M pieces from adjustment information of N pieces and transmit adjustment information of M pieces, wherein M is smaller than N and both M and N are positive integers.

[0274] In some embodiments, the communication system (100) is at least:

[0275] Receiving first sidelink information from a second terminal device and second sidelink information from a third terminal device; determining, based on the first sidelink information and the second sidelink information, that a first resource reserved by the first sidelink information needs to be re-selected; and if the first terminal device is a destination receiving terminal device of the second terminal device, or if the first terminal device is not a destination receiving terminal device of the second terminal device but the first terminal device is a destination receiving terminal device of the third terminal device, the first terminal device may include a first terminal device configured to transmit first coordination information to the second terminal device to indicate that the first resource needs to be re-selected.

[0276] Embodiments of the present disclosure further provide a network device, which may be, for example, a base station, but is not limited thereto, and may also be other network devices.

[0277] FIG. 20 is a schematic diagram of the configuration of a network device in embodiments of the present disclosure. As shown in FIG. 20, the network device (2000) may include a processor (2010), such as a central processing unit (CPU), and a memory (2020), the memory (2020) being coupled to the processor (2010). The memory (2020) may store various data; and also store a program (2030) for information processing and execute the program (2030) under the control of the processor (2010).

[0278] Additionally, as illustrated in FIG. 20, the network device (2000) may further include a transceiver (2040) and an antenna (2050), and the functions of said components are similar to those of the relevant technology and are not repeated herein. It is worth noting that the network device (2000) does not need to include all the components illustrated in FIG. 20. Furthermore, the network device (2000) may include components not illustrated in FIG. 20, and relevant technologies may be referenced.

[0279] Embodiments of the present disclosure further provide terminal equipment, but the present disclosure is not limited thereto, and it may also be other devices.

[0280] FIG. 21 is a schematic diagram of terminal equipment in embodiments of the present disclosure. As illustrated in FIG. 21, terminal equipment (2100) may include a processor (2110) and a memory (2120); the memory (2120) stores data and programs and is coupled to the processor (2110). It is worth noting that this figure is exemplary; other types of structures may also be used to supplement or replace this structure to realize communication functions or other functions.

[0281] For example, the processor (2110) may be configured to execute a program for implementing a device-to-device coordination method as described in embodiments of the first aspect. For example, the processor (2110) may be configured to perform the following control: receiving first sidelink information from a second terminal device and second sidelink information from a third terminal device; determining, based on the first sidelink information and the second sidelink information, that a first resource reserved by the first sidelink information needs to be re-selected; and transmitting first coordination information to the second terminal device to indicate that the first resource needs to be re-selected—the priority of the first coordination information is the same as the highest priority among the priority of the first sidelink information and the priority of the second sidelink information.

[0282] For example, the processor (2110) may be configured to execute a program for implementing a device-to-device coordination method as described in embodiments of the second aspect. For example, the processor (2110) may be configured to perform the following control: receiving first sidelink information from a second terminal device and second sidelink information from a third terminal device; determining, based on the first sidelink information and the second sidelink information, that the first sidelink information and the second sidelink information need to be retransmitted; and transmitting second coordination information to the second terminal device to indicate that the first sidelink information needs to be retransmitted, and transmitting third coordination information to the third terminal device to indicate that the second sidelink information needs to be retransmitted—where the priority of the second coordination information is the same as the priority of the first sidelink information, and the priority of the third coordination information is the same as the priority of the second sidelink information.

[0283] For example, the processor (2110) may be configured to execute a program for implementing a device-to-device coordination method as described in embodiments of the third aspect. For example, the processor (2110) may be configured to perform the following control: receiving sidelink information from the second terminal equipment; and transmitting a reselection command to the second terminal equipment to instruct to perform resource reselection of the sidelink information and / or an acknowledgment (ACK) or a non-acknowledgment (NACK), depending on whether the second terminal equipment is a destination terminal equipment.

[0284] For example, the processor (2110) may be configured to execute a program for implementing a device-to-device coordination method as described in embodiments of the third aspect. For example, the processor (2110) may be configured to perform the following controls: transmitting sidelink information; and receiving a reselection command to instruct to perform resource reselection and / or acknowledgment (ACK) or non-acknowledgment (NACK) of the sidelink information transmitted from one or more first terminal devices.

[0285] For example, the processor (2110) may be configured to execute a program for implementing a device-to-device coordination method as described in the embodiments of the fourth aspect. For example, the processor (2110) may be configured to perform the following control: receiving sidelink information from the second terminal equipment; and transmitting a reselection command to the second terminal equipment to instruct to perform resource reselection using the first resource or the second resource, depending on whether it is the destination terminal equipment of the second terminal equipment.

[0286] For example, the processor (2110) may be configured to execute a program for implementing a device-to-device coordination method as described in the embodiments of the fourth aspect. For example, the processor (2110) may be configured to perform the following controls: transmitting sidelink information; and receiving an acknowledgment (ACK) or non-acknowledgment (NACK) of the sidelink information transmitted by one or more first terminal devices, and / or transmitting a reselection command to instruct the first terminal devices to perform resource reselection using the first resource and / or the second resource.

[0287] For example, the processor (2110) may be configured to execute a program for implementing a device-to-device coordination method as described in the embodiments of the fifth aspect. For example, the processor (2110) may be configured to perform the following control: randomly or pseudo-randomly selecting coordination information of M pieces from coordination information of N pieces, and transmitting coordination information of M pieces—M is smaller than N, and M and N are both positive integers.

[0288] For example, the processor (2110) may be configured to execute a program for implementing a device-to-device coordination method as described in the embodiments of the sixth aspect. For example, the processor (2110) may be configured to perform the following control: receiving first sidelink information from a second terminal device and second sidelink information from a third terminal device; determining, based on the first sidelink information and the second sidelink information, that a first resource reserved by the first sidelink information needs to be re-selected; and, if the first terminal device is the destination receiving terminal device of the second terminal device, or if the first terminal device is not the destination receiving terminal device of the second terminal device but the first terminal device is the destination receiving terminal device of the third terminal device, the first terminal device transmits first coordination information to the second terminal device to indicate that the first resource needs to be re-selected.

[0289] As illustrated in FIG. 21, the terminal equipment (2100) may additionally include a communication module (2130), an input unit (2140), a display (2150), and a power supply (2160). The functions of the components are similar to those of the relevant art and are not repeated herein. It is worth noting that the terminal equipment (2100) does not need to include all the components illustrated in FIG. 21, and that these components are not essential. Furthermore, the terminal equipment (2100) may also include components not illustrated in FIG. 21, and the relevant art may be referenced.

[0290] Embodiments of the present disclosure further provide a computer program, and when a terminal device executes the program, the program enables the terminal device to execute the device-to-device coordination method described in embodiments of the first to sixth aspects.

[0291] Embodiments of the present disclosure further provide a storage medium in which a computer program is stored, wherein the computer program enables a terminal device to execute the device-to-device coordination method described in embodiments of the first to sixth aspects.

[0292] The devices and methods in the present disclosure may be realized by hardware or by combining hardware and software. The present disclosure relates to such computer-readable programs, wherein when the program is executed by a logic component, the computer-readable program enables the logic component to realize the device or component described in the text above, or enables the logic component to realize various methods or steps described in the text above. The present disclosure also relates to storage media for storing programs, such as hard disks, magnetic disks, optical disks, DVDs, flash memory, etc.

[0293] By combining the methods / devices described in the embodiments of the present disclosure, hardware, software executed by a processor, or a combination of both may be directly reflected. For example, one or more of the functional block diagrams as shown in the drawings, or a combination of one or more of the functional block diagrams, may correspond to software modules of a computer program flow and may also correspond to hardware modules. These software modules may each correspond to the steps as shown in the drawings. These hardware modules may be realized by solidifying these software modules using, for example, a field-programmable gate array (FPGA).

[0294] The software module may be located in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disks, mobile magnetic disks, CD-ROMs, or any other form of storage medium known in the art. The storage medium may be coupled to a processor, thereby enabling the processor to read information from the storage medium and write information to the storage medium; or the storage medium may be a component of the processor. The processor and the storage medium may be located in an ASIC. The software module may be stored in the memory of a mobile terminal and may also be stored on a memory card of a mobile terminal. For example, if a device (such as a mobile terminal) adopts a MEGA-SIM card with a larger capacity or a flash memory device with a larger capacity, the software module may be stored on the MEGA-SIM card or the flash memory device with a larger capacity.

[0295] One or more of the functional block diagrams described in the drawings, or a combination of one or more of the functional block diagrams, may be implemented as a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic device, a discrete gate or transistor logic device, discrete hardware components, or any combination thereof, for performing the functions described in this disclosure. One or more of the functional block diagrams described in the drawings, or a combination of one or more of the functional block diagrams, may also be implemented as a combination of computer equipment, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors combined with and communicating with a DSP, or any other such configuration.

[0296] Although the present disclosure is described in combination with specific embodiments, those skilled in the art should clearly understand that such descriptions are illustrative and do not limit the scope of protection of the present disclosure. Those skilled in the art may make various variations and modifications to the present disclosure based on the spirit and principles of the present disclosure, and such variations and modifications are also within the scope of the present disclosure.

[0297] For embodiments including the above embodiments, the following supplements are also disclosed:

[0298] Supplement 1. As a method for coordinating between devices, the present method is:

[0299] A step of receiving first sidelink information from a second terminal device and second sidelink information from a third terminal device by means of a first terminal device;

[0300] A step in which the first terminal equipment determines that, according to the first sidelink information and the second sidelink information, the first resource reserved by the first sidelink information needs to be re-selected; and

[0301] The method includes the step of transmitting first coordination information to the second terminal equipment to indicate that the first resource needs to be re-selected by the first terminal equipment—the priority of the first coordination information is the same as the highest priority among the priority of the first sidelink information and the priority of the second sidelink information.

[0302] Supplement 2. In the method according to Supplement 1, the first sidelink information includes a first sidelink control information (SCI) and a first physical sidelink sharing channel (PSSCH), and the priority of the first sidelink information is the same as the priority indicated by a field within the first sidelink control information;

[0303] The second sidelink information includes the second sidelink control information (SCI) and the second physical sidelink shared channel (PSSCH), and the priority of the second sidelink information is the same as the priority indicated by the field within the second sidelink control information.

[0304] Supplement 3. In the method according to Supplement 2, the first resource reserved by the first sidelink control information and the second resource reserved by the second sidelink control information overlap at least partially in the time domain and the frequency domain.

[0305] Supplement 4. In the method according to any one of Supplements 1 to 3, the first adjustment information is carried by a physical sidelink feedback channel (PSFCH).

[0306] Supplement 5. In a method according to any one of Supplements 1 to 4, the first terminal equipment is the destination receiving terminal equipment of the second terminal equipment, or

[0307] Alternatively, the first terminal equipment is not the destination receiving terminal equipment of the second terminal equipment, but the first terminal equipment is the destination receiving terminal equipment of the third terminal equipment.

[0308] Supplement 6. In a method according to any one of Supplements 1 to 5, the second terminal equipment performs unicast, groupcast, or broadcast sidelink communication.

[0309] Supplement 7. In the method according to Supplement 1, the method is:

[0310] A step of determining, by the first terminal equipment, that the first sidelink information and the second sidelink information need to be retransmitted according to the first sidelink information and the second sidelink information; and

[0311] The method further includes the step of transmitting, by the first terminal equipment, second coordination information to the second terminal equipment to indicate that the first sidelink information needs to be retransmitted, and transmitting third coordination information to the third terminal equipment to indicate that the second sidelink information needs to be retransmitted— wherein the priority of the second coordination information is the same as the priority of the first sidelink information, and the priority of the third coordination information is the same as the priority of the second sidelink information.

[0312] Supplement 8. In the method according to Supplement 7, the first sidelink information includes first sidelink control information (SCI) and a first physical sidelink shared channel (PSSCH), and the priority of the first sidelink information is the same as the priority indicated by a field within the first sidelink control information;

[0313] The second sidelink information includes the second sidelink control information (SCI) and the second physical sidelink shared channel (PSSCH), and the priority of the second sidelink information is the same as the priority indicated by the field within the second sidelink control information.

[0314] Supplement 9. In the method according to Supplement 7, the resource where the first sidelink information is located and the resource where the second sidelink information is located overlap at least partially in the time domain.

[0315] Supplement 10. In a method according to any one of Supplements 7 to 9, the second terminal equipment is the destination receiving terminal equipment of the third terminal equipment, and the third terminal equipment is the destination receiving terminal equipment of the second terminal equipment.

[0316] Supplement 11. In a method according to any one of Supplements 7 to 10, the second adjustment information and the third adjustment information are carried by a physical sidelink feedback channel (PSFCH).

[0317] Supplement 12. In the method according to any one of Supplements 7 through 11, the method is:

[0318] The method further includes the step of randomly or pseudo-randomly selecting adjustment information of M pieces from adjustment information of N pieces by the first terminal equipment and transmitting adjustment information of M pieces—where M is smaller than N, and M and N are both positive integers.

[0319] Supplement 13. In a method according to any one of Supplements 6 to 12, the second terminal equipment performs unicast, groupcast, or broadcast sidelink communication;

[0320] Alternatively, the second terminal equipment performs sidelink communication of the first multicast using the same physical sidelink feedback channel resource to provide feedback of a non-acknowledgment (NACK) to one or more receiving terminal equipment.

[0321] Supplement 14. In the method according to any one of Supplements 1 to 13, the method is:

[0322] If the first terminal equipment decides to transmit an acknowledgment (ACK) to the second terminal equipment and is unable to cancel the transmission of the acknowledgment (ACK) due to a priority rule, the method further includes a step in which the first terminal equipment indicates that the second terminal equipment does not need to perform resource reselection.

[0323] Supplement 15. As a method for coordinating between devices, the present method is:

[0324] A step of receiving sidelink information from a second terminal device by means of a first terminal device; and

[0325] The method includes the step of transmitting a reselection command to the second terminal equipment to instruct the first terminal equipment to perform resource reselection of sidelink information and / or an acknowledgment (ACK) or a non-acknowledgment (NACK), depending on whether the first terminal equipment is the destination terminal equipment of the second terminal equipment.

[0326] Supplement 16. In the method according to Supplement 15, when the first terminal device is the destination terminal device of the second terminal device and the second terminal device needs to perform resource reselection, both a reselection command and a non-acknowledgment (NACK) are transmitted to the second terminal device.

[0327] Supplement 17. In the method according to Supplement 16, when the priority rule is executed, the reselection command and the non-acknowledgment are taken as feedback information of one piece and prioritized, and the priority of the feedback information is the same as the highest priority among the priority of the reselection command and the priority of the non-acknowledgment.

[0328] Supplement 18. In the method according to Supplement 15, when the first terminal equipment is not the destination terminal equipment of the second terminal equipment and the second terminal equipment needs to perform resource reselection, a reselection command is transmitted to the second terminal equipment.

[0329] Supplement 19. In the method according to any one of Supplements 13 to 18, the reselection command is carried by a physical sidelink feedback channel (PSFCH).

[0330] Supplement 20. In the method according to Supplement 19, the slot of the physical sidelink feedback channel carrying the reselection command is identical to the slot of the physical sidelink feedback channel carrying the acknowledgment (ACK) or non-acknowledgment (NACK);

[0331] The resource block (RB) and / or sequence carrying the reselection command is configured or pre-configured and differs from the resource block (RB) and / or sequence of the physical sidelink feedback channel carrying the acknowledgment (ACK) or non-acknowledgment (NACK).

[0332] Supplement 21. In the method according to Supplement 19, the slot of the physical sidelink feedback channel carrying the reselection command is different from the slot of the physical sidelink feedback channel carrying the acknowledgment (ACK) or non-acknowledgment (NACK).

[0333] Supplement 22. In a method according to any one of Supplements 15 to 21, the second terminal equipment performs unicast, groupcast, or broadcast sidelink communication;

[0334] Alternatively, the second terminal equipment performs sidelink communication of the first multicast using the same physical sidelink feedback channel resource to feed back non-acknowledgments to the receiving terminal equipment.

[0335] Supplement 23. In the method according to any one of Supplements 15 to 22, the method is:

[0336] If the first terminal equipment decides to transmit an acknowledgment (ACK) to the second terminal equipment and is unable to cancel the transmission of the acknowledgment (ACK) due to a priority rule, the method further includes a step in which the first terminal equipment indicates that the second terminal equipment does not need to perform resource reselection.

[0337] Supplement 24. As a method for coordinating between devices, the present method is:

[0338] A step of transmitting sidelink information by means of a second terminal device; and

[0339] It includes the step of receiving a reselection command for instructing to perform resource reselection of sidelink information and / or an acknowledgment (ACK) or non-acknowledgment (NACK), transmitted from one or more first terminal devices.

[0340] Supplement 25. In the method according to Supplement 24, the method is:

[0341] The method further includes the step of determining a non-acknowledgment (NACK) or non-continuous transmission (DTX) by the second terminal equipment and performing resource reselection when a reselection command is received.

[0342] Supplement 26. In the method according to Supplement 24, the method is:

[0343] In the case where it is determined as an acknowledgment (ACK), it further includes a step of determining that the sidelink information is accurately received by the second terminal equipment.

[0344] Supplement 27. In the method according to Supplement 24, the method is:

[0345] The method further includes a step in which, if determined as a non-acknowledgment (NACK) or non-continuous transmission (DTX) but a reselection command is not received, the second terminal equipment determines that the sidelink information is not received correctly.

[0346] Supplement 28. In a method according to any one of Supplements 24 to 27, the second terminal equipment performs unicast, groupcast, or broadcast sidelink communication;

[0347] Alternatively, the second terminal equipment performs sidelink communication of the first multicast, in which receiving terminal equipment feeds back non-acknowledgments using the same physical sidelink feedback channel resource.

[0348] Supplement 29. As a method for coordinating between devices, the present method is:

[0349] A step of receiving sidelink information from a second terminal device by means of a first terminal device; and

[0350] Depending on whether the second terminal equipment is a destination terminal equipment, the method includes the step of transmitting a reselection command to the second terminal equipment to instruct the first terminal equipment to perform resource reselection using the first resource or the second resource.

[0351] Supplement 30. In the method according to Supplement 29, when the first terminal equipment is the destination terminal equipment of the second terminal equipment and the second terminal equipment needs to perform resource reselection, a reselection command is transmitted to the second terminal equipment using the first resource.

[0352] Supplement 31. In the method according to Supplement 29, when the first terminal equipment is the destination terminal equipment of the second terminal equipment and the second terminal equipment needs to perform resource reselection, the first terminal equipment sends a reselection command to the second terminal equipment using the first resource and skips sending a non-acknowledgment (NACK) to the second terminal equipment.

[0353] Supplement 32. In the method according to Supplements 30 and 31, the first resource is a physical sidelink feedback channel (PSFCH) resource.

[0354] Supplement 33. In the method according to Supplements 30 or 31, the slot of the first resource carrying the reselection command is identical to the slot of the physical sidelink feedback channel carrying an acknowledgment (ACK) or a non-acknowledgment (NACK);

[0355] The resource block (RB) and / or sequence of the first resource carrying the reselection command is configured or pre-configured and is different from the resource block (RB) and / or sequence of the physical sidelink feedback channel carrying the acknowledgment (ACK) or non-acknowledgment (NACK).

[0356] Supplement 34. In the method according to Supplements 30 or 31, the slot of the first resource carrying the reselection command is different from the slot of the physical sidelink feedback channel carrying the acknowledgment (ACK) or non-acknowledgment (NACK).

[0357] Supplement 35. In the method according to Supplement 29, when the first terminal equipment is not the destination terminal equipment of the second terminal equipment and the second terminal equipment needs to perform resource reselection, a reselection command is transmitted to the second terminal equipment using the second resource.

[0358] Supplement 36. In the method according to Supplement 35, the second resource is different from the first resource.

[0359] Supplement 37. In the method according to Supplement 35, the second resource is a physical sidelink feedback channel (PSFCH) resource.

[0360] Supplement 38. In the method according to Supplement 37, the slot of the second resource carrying the reselection command is identical to the slot of the physical sidelink feedback channel carrying the acknowledgment (ACK) or non-acknowledgment (NACK);

[0361] The resource block (RB) and / or sequence of the second resource carrying the reselection command is configured or pre-configured and is different from the resource block (RB) and / or sequence of the physical sidelink feedback channel carrying the acknowledgment (ACK) or non-acknowledgment (NACK).

[0362] Supplement 39. In the method according to Supplement 37, the slot of the second resource carrying the reselection command is different from the slot of the physical sidelink feedback channel carrying the acknowledgment (ACK) or non-acknowledgment (NACK).

[0363] Supplement 40. In a method according to any one of Supplements 29 to 39, the first resource and the second resource are physical sidelink feedback channel (PSFCH) resources, and the slot of the first resource is identical to the slot of the second resource;

[0364] Resource blocks (RB) and / or sequences of the first and second resources are configured or pre-configured, and the resource blocks (RB) or sequences of the first and second resources are different.

[0365] Supplement 41. In a method according to any one of Supplements 29 to 40, the second terminal equipment performs unicast, groupcast, or broadcast sidelink communication;

[0366] Alternatively, the second terminal equipment performs sidelink communication of the first multicast using the same physical sidelink feedback channel resource to feed back non-acknowledgments to the receiving terminal equipment.

[0367] Supplement 42. In the method according to any one of Supplements 29 to 41, the method is:

[0368] If the first terminal equipment decides to transmit an acknowledgment (ACK) to the second terminal equipment and is unable to cancel the transmission of the acknowledgment (ACK) due to a priority rule, the method further includes a step in which the first terminal equipment indicates that the second terminal equipment does not need to perform resource reselection.

[0369] Supplement 43. As a method for coordinating between devices, the present method is:

[0370] A step of transmitting sidelink information by means of a second terminal device; and

[0371] The method includes the step of receiving an acknowledgment (ACK) or non-acknowledgment (NACK) of sidelink information transmitted by one or more first terminal devices, and / or transmitting a reselection command to instruct the first terminal devices to perform resource reselection using the first resource and / or the second resource.

[0372] Supplement 44. In the method according to Supplement 43, the method is:

[0373] The method further includes a step of determining, by the second terminal equipment, that the sidelink information is correctly received when it is determined as an acknowledgment (ACK) and the reselection command is not received on the first resource.

[0374] Supplement 45. In the method according to Supplement 43, the method is:

[0375] The method further includes a step of determining, by the second terminal equipment, that sidelink information is not received correctly if it is determined as a non-acknowledgment (NACK) or non-continuous transmission (DTX) and the reselection command is not received at both the first resource and the second resource.

[0376] Supplement 46. In the method according to Supplement 43, the method is:

[0377] The method further includes the step of performing resource reselection by the second terminal equipment when a reselection command is received on the first resource as determined as an acknowledgment, or when a reselection command is received on the first resource or the second resource as determined as a non-acknowledgment or DTX.

[0378] Supplement 47. In a method according to any one of Supplements 43 to 46, the second terminal equipment performs unicast, groupcast, or broadcast sidelink communication;

[0379] Alternatively, the second terminal equipment performs sidelink communication of the first multicast using the same physical sidelink feedback channel resource to feed back non-acknowledgments to the receiving terminal equipment.

[0380] Supplement 48. As a method for coordinating between devices, the present method is:

[0381] A step of receiving first sidelink information from a second terminal device and second sidelink information from a third terminal device by means of a first terminal device;

[0382] A step of determining, by the first terminal equipment, that the first sidelink information and the second sidelink information need to be retransmitted according to the first sidelink information and the second sidelink information; and

[0383] The method includes the step of transmitting second coordination information to a second terminal device to indicate that the first sidelink information needs to be retransmitted by the first terminal device, and transmitting third coordination information to a third terminal device to indicate that the second sidelink information needs to be retransmitted— wherein the priority of the second coordination information is the same as the priority of the first sidelink information, and the priority of the third coordination information is the same as the priority of the second sidelink information.

[0384] Supplement 49. In the method according to Supplement 48, the first sidelink information includes a first sidelink control information (SCI) and a first physical sidelink shared channel (PSSCH), and the priority of the first sidelink information is the same as the priority indicated by a field within the first sidelink control information;

[0385] The second sidelink information includes the second sidelink control information (SCI) and the second physical sidelink shared channel (PSSCH), and the priority of the second sidelink information is the same as the priority indicated by the field within the second sidelink control information.

[0386] Supplement 50. In the method according to Supplement 48, the resource where the first sidelink information is located and the resource where the second sidelink information is located overlap at least partially in the time domain.

[0387] Supplement 51. In a method according to any one of Supplements 48 to 50, the second terminal equipment is the destination receiving terminal equipment of the third terminal equipment, and the third terminal equipment is the destination receiving terminal equipment of the second terminal equipment.

[0388] Supplement 52. In the method according to any one of Supplements 48 to 51, the second adjustment information and the third adjustment information are carried by a physical sidelink feedback channel (PSFCH).

[0389] Supplement 53. In the method according to any one of Supplements 48 to 52, the method is:

[0390] The method further includes the step of randomly or pseudo-randomly selecting adjustment information of M pieces from adjustment information of N pieces by the first terminal equipment and transmitting adjustment information of M pieces—where M is smaller than N, and M and N are both positive integers.

[0391] Supplement 54. In a method according to any one of Supplements 48 to 53, the second terminal equipment performs unicast, groupcast, or broadcast sidelink communication;

[0392] Alternatively, the second terminal equipment performs sidelink communication of the first multicast using the same physical sidelink feedback channel resource to feed back non-acknowledgments to the receiving terminal equipment.

[0393] Supplement 55. In the method according to any one of Supplements 48 through 54, the method is:

[0394] If the first terminal equipment decides to transmit an acknowledgment (ACK) to the second terminal equipment and is unable to cancel the transmission of the acknowledgment (ACK) due to a priority rule, the method further includes a step in which the first terminal equipment indicates that the second terminal equipment does not need to perform resource reselection.

[0395] Supplement 56. As a method for coordinating between devices, the present method is:

[0396] A step of receiving first sidelink information from a second terminal device and second sidelink information from a third terminal device by means of a first terminal device;

[0397] A step in which the first terminal equipment determines that, according to the first sidelink information and the second sidelink information, the first resource reserved by the first sidelink information needs to be re-selected; and

[0398] If the first terminal equipment is the destination receiving terminal equipment of the second terminal equipment, or if the first terminal equipment is not the destination receiving terminal equipment of the second terminal equipment but the first terminal equipment is the destination receiving terminal equipment of the third terminal equipment, the method includes the step of transmitting first coordination information to the second terminal equipment to indicate that the first resource needs to be re-selected by the first terminal equipment.

[0399] Supplement 57. As a method for coordinating between devices, the present method is:

[0400] The method includes the step of randomly or pseudo-randomly selecting adjustment information of M pieces from adjustment information of N pieces by a first terminal device and transmitting adjustment information of M pieces—where M is smaller than N, and M and N are both positive integers.

[0401] Supplement 58. As a method for coordinating between devices, the present method is:

[0402] A step of determining to transmit an acknowledgment (ACK) to a second terminal device by the first terminal device;

[0403] If the transmission of an acknowledgment (ACK) is not canceled due to a priority rule, the method includes a step in which the first terminal equipment indicates that the second terminal equipment does not need to perform resource reselection.

[0404] Supplement 59. As a terminal device, the device comprises memory and a processor, the memory stores a computer program, and the processor is configured to execute a device-to-device coordination method according to any one of Supplements 1 to 58.

[0405] Supplement 60. As a communication system, the present system includes terminal equipment according to Supplement 59.

Claims

Claim 1 A device-to-device coordination device configured in a first terminal device, comprising: a receiver configured to receive first sidelink information from a second terminal device and second sidelink information from a third terminal device; a processor configured to determine, based on the first sidelink information and the second sidelink information, that a collision occurs in a first resource reserved by the first sidelink information from the second terminal device; and a transmitter configured to transmit a physical sidelink feedback channel having first coordination information to the second terminal device to indicate that a collision occurs in the first resource— wherein the priority of the first coordination information is the same as the highest priority among the priority of the first sidelink information and the priority of the second sidelink information. Claim 2 A device-to-device coordination device according to claim 1, wherein the first side link information includes first side link control information and a first physical side link sharing channel, and the priority of the first side link information is the same as the priority indicated by a field within the first side link control information; and the second side link information includes second side link control information and a second physical side link sharing channel, and the priority of the second side link information is the same as the priority indicated by a field within the second side link control information. Claim 3 In paragraph 2, the first resource reserved by the first sidelink control information and the second resource reserved by the second sidelink control information are a device-to-device coordination device that overlaps at least partially in the time domain and the frequency domain. Claim 4 In paragraph 1, the first terminal equipment is a device-to-device coordination device that is the destination receiving terminal equipment of the second terminal equipment. Claim 5 In paragraph 1, the first terminal equipment is not the destination receiving terminal equipment of the second terminal equipment, but is a device-to-device coordination device in which the first terminal equipment is the destination receiving terminal equipment of the third terminal equipment. Claim 6 In claim 1, the second terminal equipment is a device-to-device coordination device that performs unicast, groupcast, or broadcast sidelink communication. Claim 7 In claim 1, the processor is further configured to determine that the first sidelink information and the second sidelink information need to be retransmitted according to the first sidelink information and the second sidelink information; the transmitter is further configured to transmit second coordination information to the second terminal equipment to indicate that the first sidelink information needs to be retransmitted, and to transmit third coordination information to the third terminal equipment to indicate that the second sidelink information needs to be retransmitted, wherein the priority of the second coordination information is the same as the priority of the first sidelink information and the priority of the third coordination information is the same as the priority of the second sidelink information, and an inter-device coordination device. Claim 8 In claim 7, the first side link information includes first side link control information and a first physical side link sharing channel, and the priority of the first side link information is the same as the priority indicated by a field within the first side link control information; and the second side link information includes second side link control information and a second physical side link sharing channel, and the priority of the second side link information is the same as the priority indicated by a field within the second side link control information, in a device-to-device coordination device. Claim 9 In paragraph 8, the resource where the first sidelink information is located and the resource where the second sidelink information is located are a device-to-device coordination device that overlaps at least partially in the time domain. Claim 10 In claim 7, the second terminal equipment is the destination receiving terminal equipment of the third terminal equipment, and the third terminal equipment is the destination receiving terminal equipment of the second terminal equipment, forming a device-to-device coordination device. Claim 11 In claim 7, the second adjustment information and the third adjustment information are an inter-device adjustment device carried by a physical sidelink feedback channel. Claim 12 In claim 7, the transmitter is further configured to randomly or pseudo-randomly select coordination information of M pieces from coordination information of N pieces and transmit the coordination information of M pieces, wherein M is smaller than N and M and N are both positive integers, an inter-device coordination device. Claim 13 A communication system comprising: a first terminal device configured to transmit a physical sidelink feedback channel having first coordination information to the second terminal device, wherein the priority of the first coordination information is the same as the highest priority among the priority of the first sidelink information and the priority of the second sidelink information. Claim 14 delete Claim 15 delete Claim 16 delete Claim 17 delete Claim 18 delete Claim 19 delete Claim 20 delete

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