Communication method, first terminal, second terminal, and communication system

Abstract

The present disclosure relates to a communication method, a first terminal, a second terminal and a communication system. The method comprises: a first terminal sending a physical sidelink shared channel (PSSCH) to a second terminal, the PSSCH corresponding to N physical sidelink feedback channel (PSFCH) occasions, N being an integer greater than or equal to 1; the first terminal performing a first action on a selected first resource; wherein the first action is an action of whether to perform retransmission on the PSSCH using the first resource; wherein the first resource is used for PSSCH retransmission. Through the embodiments of the present disclosure, the terminal behavior is specified, and the performance is avoided to be affected due to unclear terminal behavior.

Description

Technical Field

[0001] This disclosure relates to the field of communication technology, and in particular to communication methods, a first terminal, a second terminal, and a communication system. Background Technology

[0002] In the field of communications, the Physical Sidelink Shared Channel (PSSCH) is typically used to transmit data between terminals. During data transmission, through the mapping from PSSCH to PSFCH, each PSSCH is configured with at least one Physical Sidelink Feedback Channel (PSFCH) occasion to feed back the HARQ information corresponding to the PSSCH. Summary of the Invention

[0003] When one PSCCH corresponds to multiple PSFCH events, the terminal's behavior regarding retransmission resources is unclear, which can lead to reduced communication performance.

[0004] This disclosure presents a communication method, a first terminal, a second terminal, and a communication system.

[0005] According to a first aspect of the present disclosure, a communication method is proposed, the method comprising: a first terminal sending a Physical Direct Link Shared Channel (PSSCH) to a second terminal, wherein the PSSCH corresponds to N Physical Direct Link Feedback Channel (PSFCH) timings, and N is an integer greater than or equal to 1; determining whether to use the first resource to retransmit the PSSCH according to a first resource selected by the first terminal; wherein the first resource is used for the retransmission of the PSSCH.

[0006] According to a second aspect of the present disclosure, a communication method is proposed, the method comprising: a second terminal receiving a Physical Direct Link Shared Channel (PSSCH) sent by a first terminal; the second terminal receiving the PSSCH from the first terminal, indicating whether to use a first resource to retransmit the PSSCH; wherein the first resource is used for retransmission of the PSSCH; the PSSCH corresponds to N Physical Direct Link Feedback Channel (PSFCH) timings, where N is an integer greater than or equal to 1.

[0007] According to a third aspect of the present disclosure, a communication method is proposed, the method comprising: a first terminal sending a Physical Direct Link Shared Channel (PSSCH) to a second terminal, the PSSCH corresponding to N Physical Direct Link Feedback Channel (PSFCH) timings, where N is an integer greater than or equal to 1; the second terminal receiving the PSSCH sent by the first terminal; the first terminal determining, according to a selected first resource, whether to use the first resource to retransmit the PSSCH; wherein the first resource is used for PSSCH retransmission.

[0008] According to a fourth aspect of the present disclosure, a first terminal is provided, comprising: a transceiver module for transmitting a Physical Direct Link Shared Channel (PSSCH) to a second terminal, wherein the PSSCH corresponds to N Physical Direct Link Feedback Channel (PSFCH) timings, and N is an integer greater than or equal to 1; and a processing module for determining whether to use the first resource to retransmit the PSSCH according to a first resource selected by the first terminal; wherein the first resource is used for retransmitting the PSSCH.

[0009] According to a fifth aspect of the present disclosure, a second terminal is provided, comprising: a transceiver module, configured to receive a Physical Direct Link Shared Channel (PSSCH) sent by a first terminal, and to receive the PSSCH from the first terminal indicating whether to use a first resource to retransmit the PSSCH; wherein the first resource is used for retransmitting the PSSCH; the PSSCH corresponds to N Physical Direct Link Feedback Channel (PSFCH) opportunities, where N is an integer greater than or equal to 1.

[0010] According to a sixth aspect of the present disclosure, a first terminal is provided, comprising: one or more processors; wherein the processors are configured to execute the communication method of the first aspect.

[0011] According to a seventh aspect of the present disclosure, a second terminal is provided, comprising: one or more processors; wherein the processors are configured to execute the communication method of the second aspect.

[0012] According to an eighth aspect of the present disclosure, a communication system is provided, including a first terminal and a second terminal, wherein the first terminal is configured to implement the communication method of the first aspect, and the second terminal is configured to implement the communication method of the second aspect.

[0013] According to a ninth aspect of the present disclosure, a storage medium is provided, the storage medium storing instructions, characterized in that, when the instructions are executed on a communication device, the communication device causes the communication device to perform the communication method of either the first aspect or the second aspect.

[0014] The embodiments disclosed herein define terminal behavior, thereby avoiding performance impact due to unclear terminal behavior. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings required for the description of the embodiments are introduced below. The following drawings are only some embodiments of this disclosure and do not impose specific limitations on the protection scope of this disclosure.

[0016] Figure 1 This is an exemplary schematic diagram of the architecture of a communication system provided according to embodiments of the present disclosure.

[0017] Figure 2A This is an interactive schematic diagram of a communication method according to an embodiment of the present disclosure.

[0018] Figure 2B This is a schematic diagram of the first resource selection according to an embodiment of the present disclosure.

[0019] Figure 2C This is a schematic diagram illustrating other resource selections according to embodiments of this disclosure.

[0020] Figure 3A This is a flowchart illustrating a communication method according to an embodiment of the present disclosure.

[0021] Figure 3B This is a flowchart illustrating a communication method according to an embodiment of the present disclosure.

[0022] Figure 3C This is a flowchart illustrating a communication method according to an embodiment of the present disclosure.

[0023] Figure 4A This is a flowchart illustrating a communication method according to an embodiment of the present disclosure.

[0024] Figure 4B This is a flowchart illustrating a communication method according to an embodiment of the present disclosure.

[0025] Figure 5 This is an interactive schematic diagram of a communication method according to an embodiment of the present disclosure.

[0026] Figure 6A This is a schematic diagram of the structure of the first terminal proposed in the embodiments of this disclosure.

[0027] Figure 6B This is a schematic diagram of the structure of the second terminal proposed in an embodiment of this disclosure.

[0028] Figure 7A This is a schematic diagram of the structure of the communication device proposed in the embodiments of this disclosure.

[0029] Figure 7B This is a schematic diagram of the chip structure proposed in the embodiments of this disclosure. Detailed Implementation

[0030] This disclosure presents a communication method, a first terminal, a second terminal, and a communication system.

[0031] In a first aspect, embodiments of this disclosure propose that a first terminal sends a Physical Direct Link Shared Channel (PSSCH) to a second terminal, wherein the PSSCH corresponds to N Physical Direct Link Feedback Channel (PSFCH) opportunities, and N is an integer greater than or equal to 1; according to a first resource selected by the first terminal, it is determined whether to use the first resource to retransmit the PSSCH; the first resource is used for the retransmission of the PSSCH.

[0032] In conjunction with some embodiments of the first aspect, in some embodiments, the first terminal sends a Physical Direct Link Shared Channel (PSSCH) to the second terminal, the PSSCH corresponding to N Physical Direct Link Feedback Channel (PSFCH) opportunities, where N is an integer greater than or equal to 1; the first terminal performs a first action on a selected first resource; wherein the first action is whether to use the first resource to retransmit the PSSCH; wherein the first resource is used for PSSCH retransmission.

[0033] In the above embodiments, by clarifying the retransmission behavior of the terminal when one PSCCH corresponds to multiple PSFCH, the communication performance is avoided from being affected by redundant retransmissions or missing retransmission behavior due to unclear behavior of the terminal.

[0034] In conjunction with some embodiments of the first aspect, in some embodiments, the first terminal determines that at least one of the following is satisfied: a first resource exists between the Xth PSFCH timing and the (X+1)th PSFCH timing; and no Hybrid Automatic Repeat Request (HARQ) information for the PSSCH transmission result sent by the second terminal is received between the 1st PSFCH timing and the Xth PSFCH timing, wherein X is an integer greater than or equal to 1 and less than N.

[0035] In conjunction with some embodiments of the first aspect, in some embodiments, the first action is the action of retransmitting the PSSCH using the first resource.

[0036] In conjunction with some embodiments of the first aspect, in some embodiments, the first action is the action of not using the first resource to retransmit the PSSCH.

[0037] In conjunction with some embodiments of the first aspect, in some embodiments, PSSCH retransmission is not performed using the first resource if a first condition is met; the first condition includes the value of X being less than a threshold.

[0038] In the above embodiments, the scenario in which the first terminal does not use the first resource for retransmission is clarified, thereby clarifying the behavior of the terminal when one PSCCH corresponds to multiple PSFCH, and avoiding the reduction in communication performance due to unclear terminal behavior.

[0039] In conjunction with some embodiments of the first aspect, in some embodiments, the threshold is determined in at least one of the following ways: determined based on pre-configuration information of resource pools; determined based on pre-configuration information of resource sets (RB sets); determined based on pre-configuration information of bandwidth portions (BWPs); determined based on predefined rules.

[0040] In conjunction with some embodiments of the first aspect, in some embodiments, the first resource is used for PSSCH retransmission if the first condition is not met.

[0041] In the above embodiments, the scenario in which the first terminal uses the first resource for retransmission is clarified, thereby clarifying the behavior of the terminal when one PSCCH corresponds to multiple PSFCH, and avoiding the reduction in communication performance due to unclear terminal behavior.

[0042] In conjunction with some embodiments of the first aspect, in some embodiments, the time interval between any two resources selected by the first terminal for the transport block TB transmitted on the PSSCH is greater than or equal to the minimum time interval.

[0043] In conjunction with some embodiments of the first aspect, in some embodiments, the minimum time interval is determined based on the timing of the first PSFCH corresponding to the PSSCH.

[0044] Secondly, this disclosure proposes that a second terminal receives a Physical Direct Link Shared Channel (PSSCH) sent by a first terminal; the second terminal receives the PSSCH from the first terminal to determine whether to use a first resource to retransmit the PSSCH; wherein the first resource is used for PSSCH retransmission; the PSSCH corresponds to N Physical Direct Link Feedback Channel (PSFCH) opportunities, where N is an integer greater than or equal to 1.

[0045] In conjunction with some embodiments of the second aspect, in some embodiments, the second terminal receives the Physical Direct Link Shared Channel (PSSCH) sent by the first terminal; the second terminal receives the PSSCH retransmitted by the first terminal performing a first action; wherein, the first action is the action of whether to use the first resource to retransmit the PSSCH; wherein, the first resource is used for the retransmission of the PSSCH; the PSSCH corresponds to N Physical Direct Link Feedback Channel (PSFCH) opportunities, where N is an integer greater than or equal to 1.

[0046] In conjunction with some embodiments of the second aspect, in some embodiments, a first resource exists between the Xth PSFCH timing and the (X+1)th PSFCH timing; the method further includes: the second terminal performing channel listening on the PSFCH timings of the N physical direct link feedback channels corresponding to the PSSCH; sending Hybrid Automatic Repeat Request (HARQ) information for the PSSCH transmission result on the earliest PSFCH occasion where channel listening is successful; wherein, from the 1st PSFCH timing to the Xth PSFCH timing, the second terminal does not send HARQ information to the first terminal; wherein, X is an integer greater than or equal to 1 and less than N.

[0047] In conjunction with some embodiments of the second aspect, in some embodiments, the first action is the action of retransmitting the PSSCH using the first resource.

[0048] In conjunction with some embodiments of the second aspect, in some embodiments, the first action is the action of not using the first resource for PSSCH retransmission.

[0049] In conjunction with some embodiments of the second aspect, in some embodiments, if a first condition is met, the first resource is not used to receive the PSSCH retransmitted by the first terminal; the first condition includes the value of X being less than a threshold.

[0050] In conjunction with some embodiments of the second aspect, in some embodiments, the threshold is determined in at least one of the following ways: determined based on pre-configuration information of resource pools; determined based on pre-configuration information of resource sets (RB sets); determined based on pre-configuration information of bandwidth portions (BWPs); determined based on predefined rules.

[0051] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes:

[0052] If the first condition is not met, the first resource is used to receive the PSSCH retransmitted by the first terminal.

[0053] In conjunction with some embodiments of the second aspect, in some embodiments, the time interval between any two resources selected by the first terminal for the transport block TB transmitted on the PSSCH is greater than or equal to the minimum time interval.

[0054] In conjunction with some embodiments of the second aspect, in some embodiments, the minimum time interval is determined based on the timing of the first PSFCH corresponding to the PSSCH.

[0055] Thirdly, embodiments of this disclosure propose a communication method, the method comprising: a first terminal sending a Physical Direct Link Shared Channel (PSSCH) to a second terminal, wherein the PSSCH corresponds to N Physical Direct Link Feedback Channel (PSFCH) timings, and N is an integer greater than or equal to 1; the second terminal receiving the PSSCH sent by the first terminal; the first terminal performing a first action on a selected first resource; wherein the first action is the action of whether to use the first resource to perform retransmission of the PSSCH; wherein the first resource is used for PSSCH retransmission.

[0056] Fourthly, this disclosure provides a first terminal, comprising: a transceiver module for sending a Physical Direct Link Shared Channel (PSSCH) to a second terminal, wherein the PSSCH corresponds to N Physical Direct Link Feedback Channel (PSFCH) opportunities, and N is an integer greater than or equal to 1; and a processing module for determining whether to use the first resource to retransmit the PSSCH according to the first resource selected by the first terminal; wherein the first resource is used for retransmitting the PSSCH.

[0057] Fifthly, this disclosure provides a second terminal, comprising: a transceiver module, configured to receive a Physical Direct Link Shared Channel (PSSCH) sent by a first terminal, and to receive the PSSCH from the first terminal indicating whether to use a first resource to retransmit the PSSCH; wherein the first resource is used for retransmitting the PSSCH; the PSSCH corresponds to N Physical Direct Link Feedback Channel (PSFCH) opportunities, where N is an integer greater than or equal to 1.

[0058] In a sixth aspect, embodiments of this disclosure provide a first terminal, comprising: one or more processors; wherein the processors are configured to execute the communication method of the first aspect.

[0059] In a seventh aspect, embodiments of this disclosure provide a second terminal, comprising: one or more processors; wherein the processors are configured to execute the communication method of the second aspect.

[0060] Eighthly, embodiments of this disclosure provide a communication system, including: a first terminal and a network device, wherein the first terminal is configured to implement the communication method of the first aspect, and the second terminal is configured to implement the communication method of the second aspect.

[0061] Ninthly, embodiments of this disclosure provide a storage medium storing instructions that, when executed on a communication device, cause the communication device to perform a communication method according to either the first or second aspect.

[0062] It is understood that the aforementioned terminal, access network equipment, first network element, second network element, core network equipment, communication system, storage medium, program product, computer program, chip or chip system are all used to execute the methods proposed in the embodiments of this disclosure. Therefore, the beneficial effects that can be achieved can be referred to the beneficial effects in the corresponding methods, and will not be repeated here.

[0063] This disclosure provides a communication method, a first terminal, a second terminal, and a communication system. In some embodiments, the terms "communication method" and "information processing method," "data processing method," etc., can be used interchangeably; the terms "communication device" and "information processing device," "data processing," etc., can be used interchangeably; and the terms "information processing system" and "communication system," etc., can be used interchangeably.

[0064] This disclosure is not exhaustive, but merely illustrative of some embodiments, and is not intended to limit the scope of protection of this disclosure. Unless otherwise specified, each step in a particular embodiment can be implemented as an independent embodiment, and the steps can be arbitrarily combined. For example, a solution after removing some steps in a particular embodiment can also be implemented as an independent embodiment, and the order of the steps in a particular embodiment can be arbitrarily interchanged. Furthermore, the optional implementation methods in a particular embodiment can be arbitrarily combined; moreover, the embodiments can be arbitrarily combined, for example, some or all steps of different embodiments can be arbitrarily combined, and a particular embodiment can be arbitrarily combined with the optional implementation methods of other embodiments.

[0065] In each of the disclosed embodiments, unless otherwise specified or in case of logical conflict, the terminology and / or descriptions of the embodiments are consistent and can be referenced by each other. Technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships.

[0066] The terminology used in the embodiments of this disclosure is for the purpose of describing particular embodiments only and is not intended to limit the scope of this disclosure.

[0067] In this embodiment of the disclosure, unless otherwise stated, elements expressed in the singular form, such as "a," "an," "the," "the," "the," "the," "the," "the," "this," etc., can mean "one and only one," or "one or more," "at least one," etc. For example, when using articles such as "a," "an," "the," etc. in translation, the noun following the article can be understood as either a singular expression or a plural expression.

[0068] In the embodiments disclosed herein, "multiple" refers to two or more.

[0069] In some embodiments, the terms “at least one of”, “one or more”, “a plurality of”, “multiple”, etc., may be used interchangeably.

[0070] In some embodiments, the notation "at least one of A and B", "A and / or B", "A in one case, B in another", "in response to one case A, in response to another case B", etc., may include the following technical solutions depending on the situation: in some embodiments, A (execute A regardless of B); in some embodiments, B (execute B regardless of A); in some embodiments, execution is selected from A and B (A and B are selectively executed); in some embodiments, A and B (both A and B are executed). The same applies when there are more branches such as A, B, C, etc.

[0071] In some embodiments, the notation "A or B" may include the following technical solutions, depending on the situation: in some embodiments, A (execution of A regardless of B); in some embodiments, B (execution of B regardless of A); in some embodiments, execution is selected from A and B (A and B are selectively executed). The same applies when there are more branches such as A, B, C, etc.

[0072] The prefixes "first," "second," etc., used in the embodiments of this disclosure are merely for distinguishing different descriptive objects and do not impose restrictions on the position, order, priority, quantity, or content of the descriptive objects. The description of the descriptive objects is found in the claims or the context of the embodiments, and the use of prefixes should not constitute unnecessary restrictions. For example, if the descriptive object is a "field," the ordinal numbers preceding "field" in "first field" and "second field" do not restrict the position or order of the "fields." "First" and "second" do not restrict whether the "fields" they modify are in the same message, nor do they restrict the order of "first field" and "second field." Similarly, if the descriptive object is a "level," the ordinal numbers preceding "level" in "first level" and "second level" do not restrict the priority between "levels." Furthermore, the number of descriptive objects is not limited by ordinal numbers and can be one or more. For example, in "first device," the number of "devices" can be one or more. Furthermore, the objects modified by different prefixes can be the same or different. For example, if the object being described is "device", then "first device" and "second device" can be the same device or different devices, and their types can be the same or different. Similarly, if the object being described is "information", then "first information" and "second information" can be the same information or different information, and their content can be the same or different.

[0073] In some embodiments, “including A,” “containing A,” “for indicating A,” and “carrying A” can be interpreted as directly carrying A or indirectly indicating A.

[0074] In some embodiments, terms such as "time / frequency" and "time-frequency domain" refer to the time domain and / or frequency domain.

[0075] In some embodiments, the terms “in response to…”, “in response to determining…”, “in the case of…”, “when…”, “if…”, “if…”, etc., can be used interchangeably.

[0076] In some embodiments, the terms “greater than,” “greater than or equal to,” “not less than,” “more than,” “more than or equal to,” “not less than,” “higher than,” “higher than or equal to,” “not lower than,” and “above” can be used interchangeably, as can the terms “less than,” “less than or equal to,” “not greater than,” “less than,” “less than or equal to,” “not more than,” “lower than,” “lower than or equal to,” “not higher than,” and “below”.

[0077] In some embodiments, devices, etc., can be interpreted as physical or virtual, and their names are not limited to the names recorded in the embodiments. Terms such as “device”, “equipment”, “circuit”, “network element”, “node”, “function”, “unit”, “section”, “system”, “network”, “chip”, “chip system”, “entity”, and “subject” can be used interchangeably.

[0078] In some embodiments, "network" can be interpreted as devices included in a network (e.g., access network devices, core network devices, etc.).

[0079] In some embodiments, the terms "access network device (AN device)," "radio access network device (RAN device)," "base station (BS)," "radio base station," "fixed station," "node," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "antenna panel," "antenna array," "cell," "macro cell," "small cell," "femto cell," "pico cell," "sector," "cell group," "serving cell," "carrier," "component carrier," and "bandwidth part (BWP)" can be used interchangeably.

[0080] In some embodiments, the terms "terminal", "terminal device", "user equipment (UE)", "user terminal", "mobile station (MS)", "mobile terminal (MT)", subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriberstation, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, and client can be used interchangeably.

[0081] In some embodiments, access network devices, core network devices, or network devices can be replaced by terminals. For example, embodiments of this disclosure can also be applied to structures where communication between access network devices, core network devices, or network devices and terminals is replaced by communication between multiple terminals (e.g., device-to-device (D2D), vehicle-to-everything (V2X), etc.). In this case, the structure can also be configured such that the terminal has all or part of the functions of the access network device. Furthermore, terms such as "uplink" and "downlink" can be replaced with terms corresponding to communication between terminals (e.g., "sidelink"). For example, uplink channel, downlink channel, etc., can be replaced with sidelink channel, and uplink link, downlink, etc., can be replaced with sidelink link.

[0082] In some embodiments, the terminal may be replaced by an access network device, a core network device, or a network device. In this case, the access network device, core network device, or network device may also be configured to have all or some of the functions of the terminal.

[0083] In some embodiments, the acquisition of data, information, etc., may comply with the laws and regulations of the country where the location is situated.

[0084] In some embodiments, data, information, etc., may be obtained with the user's consent.

[0085] Furthermore, each element, each row, or each column in the table of this disclosure can be implemented as an independent embodiment, and any combination of any element, any row, or any column can also be implemented as an independent embodiment.

[0086] Figure 1 This is a schematic diagram of the architecture of a communication system according to an embodiment of the present disclosure.

[0087] like Figure 1 As shown, the communication system 100 includes a first terminal 101 and a second terminal 102.

[0088] In some embodiments, the first terminal 101 and the second terminal 102 include, for example, at least one of the following: mobile phone, wearable device, Internet of Things device, car with communication function, smart car, tablet computer, computer with wireless transceiver function, virtual reality (VR) terminal device, augmented reality (AR) terminal device, wireless terminal device in industrial control, wireless terminal device in self-driving, wireless terminal device in remote medical surgery, wireless terminal device in smart grid, wireless terminal device in transportation safety, wireless terminal device in smart city, and wireless terminal device in smart home, but are not limited thereto.

[0089] It is understood that the communication system described in this disclosure is for the purpose of more clearly illustrating the technical solutions of this disclosure, and does not constitute a limitation on the technical solutions proposed in this disclosure. As those skilled in the art will know, with the evolution of system architecture and the emergence of new business scenarios, the technical solutions proposed in this disclosure are also applicable to similar technical problems.

[0090] The following embodiments of this disclosure can be applied to Figure 1 The communication system 100 shown, or a part thereof, but not limited to it. Figure 1 The entities shown are illustrative; a communication system may include... Figure 1 All or part of the main body, or may include Figure 1 Other entities besides the main body, the number and form of each entity are arbitrary, each entity can be physical or virtual, the connection relationship between the entities is illustrative, the entities can be unconnected or connected, and the connection can be in any way, it can be a direct connection or an indirect connection, it can be a wired connection or a wireless connection.

[0091] The embodiments disclosed herein can be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 5G new radio (NR), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Futuregeneration radio access (FX), Global System for Mobile communications (GSM), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), and IEEE 802.20, Ultra-Wideband (UWB), Bluetooth (a registered trademark), Public Land Mobile Network (PLMN) networks, Device-to-Device (D2D) systems, Machine-to-Machine (M2M) systems, Internet of Things (IoT) systems, Vehicle-to-Everything (V2X) systems, systems utilizing other communication methods, and next-generation systems built upon them, etc. Furthermore, multiple systems can be combined (e.g., a combination of LTE or LTE-A with 5G).

[0092] In some embodiments, in the traditional (legacy) direct link communication sidelink scenario, one Physical Sidelink Control Channel (PSSCH) corresponds to only one Physical Sidelink Feedback Channel (PSFCH) occasion.

[0093] In some embodiments, in a legacy sidelink, when a Transport Block (TB) supports retransmissions based on Hybrid Automatic Repeat Request (HARQ) feedback, a minimum time interval must be satisfied between any two resources selected for that TB.

[0094] For example, the minimum time interval can be a+b. Here, "a" represents the time interval between the end position of the first symbol and the start position of the second symbol. The first symbol is the last symbol in the PSSCH transmission resource. The second symbol is the first symbol received for the PSFCH occasion corresponding to the PSSCH transmission resource. That is, the time interval between the last symbol of the PSSCH and the first symbol of the first PSFCH occasion corresponding to that PSSCH. Here, "b" represents the time required for PSFCH reception and processing, as well as sidechain retransmission preparation. For example, "b" may include at least one of the following: the necessary physical channel multiplexing and the time for any switching between transmit-to-receive (TX-RX) or receive-to-transmit (RX-TX).

[0095] In some embodiments, in the unlicensed sidelink band, one PSCCH can correspond to N PSFCH opportunities, where N is an integer greater than or equal to 1.

[0096] Understandably, when one PSCCH corresponds to multiple (e.g., N greater than or equal to 2) PSFCH occasions, continuing to rely on the minimum time interval defined in the legacy sidelink would result in the selected retransmission resource falling between the first and last PSFCH occasions. When the selected retransmission resource falls between the first and last PSFCH occasions, a situation arises where the physical layer has not yet reported HARQ information in the PSFCH occasion, but the selected retransmission resource has already arrived. In this case, the higher layer of the transmitting terminal cannot determine whether to use the retransmission resource for retransmission.

[0097] Based on this, a communication method is proposed that can clearly define the behavior of the terminal in this scenario.

[0098] Figure 2A This is an interactive schematic diagram illustrating a communication method according to an embodiment of this disclosure. For example... Figure 2A As shown, the embodiments of this disclosure relate to a communication method, which includes:

[0099] In step S2101, the first terminal 101 sends PSSCH to the second terminal 102.

[0100] In some embodiments, terms such as “send,” “transmit,” “report,” “distribute,” “transmit,” “bidirectional transmission,” “send and / or receive” can be used interchangeably.

[0101] In some embodiments, the second terminal 102 receives the Physical Sidelink Control Channel (PSSCH).

[0102] In some embodiments, the second terminal 102 receives PSSCH sent from the first terminal 101.

[0103] In some embodiments, “get,” “obtain,” “receive,” “transmit,” “bidirectional transmission,” and “send and / or receive” can be used interchangeably and can be interpreted as receiving from other entities, obtaining from protocols, obtaining from higher layers, obtaining through self-processing, or autonomous implementation, among other meanings.

[0104] In some embodiments, in an unlicensed frequency band, the first terminal 101 sends a PSSCH to the second terminal 102.

[0105] In some embodiments, PSSCH corresponds to N Physical Sidelink Feedback Channel (PSFCH) occasions, where N is an integer greater than or equal to 1.

[0106] Step S2102: The first terminal 101 selects the first resource.

[0107] In some embodiments, the first resource is used for PSSCH retransmission.

[0108] In some embodiments, the PSSCH sent by the first terminal 101 to the second terminal 102 contains multiple PSSCH resources.

[0109] In some embodiments, the first resource satisfies at least one of the following: there exists a first resource between the Xth PSFCH timing and the (X+1)th PSFCH timing; a Hybrid Automatic Repeat Request (HARQ) message indicating that no PSSCH transmission result sent by the second terminal is received between the 1st and the Xth PSFCH timing, where X is an integer greater than or equal to 1 and less than N.

[0110] In some embodiments, the first resource is a retransmission resource that satisfies the minimum time interval.

[0111] In some embodiments, the time interval between the first resource and PSSCH is greater than or equal to the minimum time interval.

[0112] In some embodiments, the minimum time interval is determined based on the timing of the first PSFCH corresponding to the PSSCH.

[0113] In some embodiments, the minimum time interval corresponds to at least one of the following:

[0114] The timing of the first PSFCH corresponding to PSSCH, and the last symbol of PSSCH.

[0115] In some embodiments, the definition of the minimum time interval can refer to the minimum time interval defined in the above embodiments, such as "a+b", which will not be repeated here.

[0116] In some embodiments, the time interval between any two resources selected by terminal 101 for a transport block (TB) transmitted on PSSCH is greater than or equal to the minimum time interval.

[0117] In step S2103, the first terminal 101 performs the first action on the selected first resource.

[0118] The first action determines whether to use the first resource to retransmit the PSSCH.

[0119] In some embodiments, the first terminal 101 performing the first action on the selected first resource can be understood as the first terminal 101 determining whether to use the first resource to retransmit the PSSCH according to the first resource selected by the first terminal.

[0120] In some embodiments, the first action includes at least one of the following:

[0121] The actions of retransmitting the PSSCH using the first resource and retransmitting the PSSCH without using the first resource.

[0122] In some embodiments, the first terminal 101 may use the first resource to retransmit the PSSCH or may not use the first resource to retransmit the PSSCH.

[0123] In some embodiments, if the first condition is not met, the first terminal 101 uses the first resource to retransmit the PSSCH.

[0124] In some embodiments, the first condition includes a value of X that is less than a threshold.

[0125] In some embodiments, the threshold is determined in at least one of the following ways:

[0126] Determined based on pre-configuration information from the resource pool;

[0127] Determining based on pre-configuration information of resource block sets (RBs)

[0128] Determined based on pre-configuration information of the Bandwidth Part (BWP);

[0129] Determined based on predefined rules.

[0130] In some embodiments, the first terminal 101 performs a retransmission of the PSSCH on a selected first resource.

[0131] For example, Figure 2B This is a schematic diagram illustrating the first resource selection according to an embodiment of the present disclosure. For example... Figure 2BAs shown, the PSFCH timing period is 4 slots. When 1 PSSCH corresponds to 3 PSFCH timings (i.e., the PSFCH occasion corresponding to slot 3, the PSFCH occasion corresponding to slot 7, and the PSFCH occasion corresponding to slot 11), and assuming the minimum time interval "a+b" is 5 slots, the corresponding retransmission resources are the retransmission resources corresponding to slot 5, slot 10, and slot 15, respectively.

[0132] Furthermore, based on Figure 2B It is known that the retransmission resource corresponding to slot 5 is located between the PSFCHoccasion corresponding to slot 3 and the PSFCH occasion corresponding to slot 7. When the first terminal 101 does not receive HARQ information on the PSFCHoccasion corresponding to slot 3, and is waiting for the retransmission resource corresponding to slot 5 to arrive, the first terminal 101 can retransmit based on the retransmission resource corresponding to slot 5. It can be understood that slot 5 in this case can be considered the first resource.

[0133] It should be noted that, Figure 2B In this context, PSFCH Physical Resource Block (PRB) set 1 is the PRB set associated with the PSFCH occasion corresponding to slot 3. That is, the frequency domain resources for the first PSFCH occasion are determined within this PRB set. PSFCH PRB set 2 is the PRB set associated with the PSFCH occasion corresponding to slot 7. That is, the frequency domain resources for the second PSFCH occasion are determined within this PRB set. PSFCH PRB set 3 is the PRB set associated with the PSFCH occasion corresponding to slot 11. That is, the frequency domain resources for the third PSFCH occasion are determined within this PRB set.

[0134] In some embodiments, the terms “frame”, “radio frame”, “subframe”, “slot”, “sub-slot”, “mini-slot”, “symbol”, “symbol”, and “transmission time interval (TTI)” can be used interchangeably.

[0135] In some embodiments, the first terminal 101 does not use the first resource to perform retransmission of PSSCH on the selected first resource.

[0136] For example, continuing Figure 2B In the example, the first terminal 101 does not receive HARQ information on the PSSCH occasion corresponding to slot 3, and does not use slot 5 to retransmit the PSSCH while waiting for the retransmission resource corresponding to slot 5 to arrive.

[0137] In some embodiments, if a first condition is met, the first resource is not used to perform a retransmission of PSSCH.

[0138] The first terminal 101 does not use the first resource to retransmit the PSSCH on the selected first resource, but uses the time domain resource located after receiving the negative acknowledgment (NACK) information for retransmission.

[0139] For example, Figure 2C This is a schematic diagram illustrating other resource selections according to embodiments of this disclosure. For example... Figure 2C As shown, the PSFCH timing period is 4 slots. When 1 PSSCH corresponds to 3 PSFCH timings (i.e., the PSFCH occasion corresponding to slot 3, the PSFCH occasion corresponding to slot 7, and the PSFCH occasion corresponding to slot 11), and assuming the minimum time interval "a+b" is 5 slots, the corresponding retransmission resources are the retransmission resources corresponding to slot 5, slot 10, and slot 15, respectively.

[0140] Furthermore, based on Figure 2CIt is known that the retransmission resource corresponding to slot 5 is located between the PSFCHoccasion corresponding to slot 3 and the PSFCH occasion corresponding to slot 7. If the first terminal 101 does not receive HARQ information on the PSFCHoccasion corresponding to slot 3, and has acquired the retransmission resource corresponding to slot 5, the first terminal 101 will not retransmit based on the retransmission resource corresponding to slot 5. It can be understood that slot 5 in this case can be considered the first resource. The first terminal 101 will continue to listen for the second PSFCH occasion. If the first terminal 101 receives a NACK on the PSFCH occasion corresponding to slot 7, the first terminal 101 will not continue to listen for the PSFCH occasion corresponding to slot 11, and will report a NACK to the higher layer on the PSFCH occasion corresponding to slot 7. The higher layer will then perform a retransmission.

[0141] Furthermore, when the retransmission resource located in slot10 arrives, the higher layers will use the retransmission resource located in slot10 to perform a retransmission.

[0142] It should be noted that for relevant explanations regarding PSFCH PRB, please refer to [link / reference needed]. Figure 2B The relevant descriptions in the embodiments will not be repeated here.

[0143] In step S2104, the first terminal 101 sends HARQ information based on the execution of the first action.

[0144] In some embodiments, the first terminal 101 sends a HARQ to the second terminal 102 based on the execution of the first action.

[0145] In some embodiments, the second terminal 102 receives a HARQ sent based on the execution of the first action.

[0146] In some embodiments, the second terminal 102 is derived from the HARQ sent by the first terminal 101 based on the execution of the first action.

[0147] In some embodiments, the names of information, etc., are not limited to the names described in the embodiments. Terms such as "information", "message", "signal", "signaling", "report", "configuration", "indication", "instruction", "command", "channel", "parameter", "domain", "field", "symbol", "symbol", "codebook", "codeword", "codepoint", "bit", "data", "program", and "chip" can be used interchangeably.

[0148] In some embodiments, the terms “PSSCH”, “data”, “TB transport block”, “PSSCH data”, etc., can be used interchangeably.

[0149] For example, performing a retransmission on the PSSCH can refer to retransmitting the data of the first terminal, or it can refer to retransmitting the TB transmitted on the PSSCH.

[0150] In some embodiments, the terms "uplink", "uplink", and "physical uplink" can be used interchangeably, as can the terms "downlink", "downlink", and "physical downlink", as well as the terms "sidelink", "sidelink", "sidelink communication", "sidelink communication", "direct connection", "direct link", "direct communication", and "direct link communication".

[0151] In some embodiments, terms such as “moment,” “point in time,” “time,” and “time location” can be used interchangeably, as can terms such as “duration,” “segment,” “time window,” “window,” and “time.”

[0152] In some embodiments, the terms “resource block (RB)”, “physical resource block (PRB)”, “sub-carrier group (SCG)”, “resource element group (REG)”, “PRB pair”, “RB pair”, “resource element (RE)”, and “sub-carrier” can be used interchangeably.

[0153] In some embodiments, terms such as "certain," "preset," "default," "set," "indicated," "a certain," "any," and "first" can be used interchangeably. "Certain A," "preset A," "default A," "set A," "indicated A," "a certain A," "any A," and "first A" can be interpreted as A pre-defined in a protocol or the like, or as A obtained through setting, configuration, or instruction, or as specific A, a certain A, any A, or first A, but are not limited thereto.

[0154] In some embodiments, the determination or judgment can be made by a value represented by 1 bit (0 or 1), or by a true or false value (boolean), or by a comparison of numerical values ​​(e.g., a comparison with a predetermined value), but is not limited thereto.

[0155] In some embodiments, "not expecting to receive" can be interpreted as not receiving on time domain resources and / or frequency domain resources, or as not performing subsequent processing on the data after receiving it; "not expecting to send" can be interpreted as not sending, or as sending but not expecting the receiver to respond to the sent content.

[0156] The communication method involved in the embodiments of this disclosure may include at least one of steps S2101 to S2104. For example, step S2102 may be implemented as a standalone embodiment, step S2103 may be implemented as a standalone embodiment, step S2102 + step S2103 may be implemented as a standalone embodiment, and step S2101 + step S2102 + step S2103 may be implemented as a standalone embodiment, but the method is not limited thereto.

[0157] In some embodiments, steps S2102 and S2103 may be performed in an alternate order or simultaneously.

[0158] In some embodiments, steps S2101, S2102, and S2104 are optional, and one or more of these steps may be omitted or substituted in different embodiments.

[0159] In some embodiments, steps S2101, S2102, and S2104 are optional, and one or more of these steps may be omitted or substituted in different embodiments.

[0160] In some embodiments, steps S2101, S2102, and S2103 are optional, and one or more of these steps may be omitted or substituted in different embodiments.

[0161] In some embodiments, see Figure 2A , Figure 2B as well as Figure 2C Other optional implementation methods described before or after the corresponding instruction manual.

[0162] Figure 3A This is a flowchart illustrating a communication method according to an embodiment of this disclosure. Figure 3A As shown, the embodiments of this disclosure relate to a communication method, which includes:

[0163] Step S3101: Send PSSCH.

[0164] In some embodiments, optional implementations of step S3101 can be found in [reference needed]. Figure 2A Optional implementation methods of step S2101, and Figure 2A , Figure 2B as well as Figure 2C Other related parts in the embodiments involved will not be described in detail here.

[0165] Step S3102: Select the first resource.

[0166] For optional implementations of step S3102, please refer to [link / reference]. Figure 2A Optional implementation methods of step S2102, and Figure 2A , Figure 2B as well as Figure 2C Other related parts in the embodiments involved will not be described in detail here.

[0167] Step S3103: Determine whether to use the first resource to retransmit PSSCH according to the first resource selected by the first terminal.

[0168] For optional implementations of step S3103, please refer to [link / reference]. Figure 2A Optional implementation methods of step S2103, and Figure 2A , Figure 2B as well as Figure 2C Other related parts in the embodiments involved will not be described in detail here.

[0169] Step S3104: Send HARQ information based on the execution of the first action.

[0170] For optional implementations of step S3104, please refer to [link / reference]. Figure 2A Optional implementation methods of step S2104, and Figure 2A , Figure 2B as well as Figure 2C Other related parts in the embodiments involved will not be described in detail here.

[0171] The communication method involved in the embodiments of this disclosure may include at least one of steps S3101 to S3104. For example, step S3102 may be implemented as an independent embodiment, step S3103 may be implemented as an independent embodiment, step S3101+S3102 may be implemented as an independent embodiment, step S3101+S3103 may be implemented as an independent embodiment, step S3102+S3103 may be implemented as an independent embodiment, and step S3101+S3102+S3103+S3104 may be implemented as an independent embodiment, but is not limited thereto.

[0172] In some embodiments, steps S3102 and S3103 may be performed in an alternate order or simultaneously.

[0173] In some embodiments, steps S3101, S3103, and S3104 are optional, and one or more of these steps may be omitted or substituted in different embodiments.

[0174] In some embodiments, steps S3101, S3102, and S3104 are optional, and one or more of these steps may be omitted or substituted in different embodiments.

[0175] In some embodiments, steps S3101, S3102, and S3103 are optional, and one or more of these steps may be omitted or substituted in different embodiments.

[0176] Figure 3B This is a flowchart illustrating a communication method according to an embodiment of this disclosure. Figure 3B As shown, the embodiments of this disclosure relate to a communication method, which includes:

[0177] Step S3201: Send PSSCH.

[0178] For optional implementations of step S3201, please refer to [link / reference]. Figure 2A Step S2101 Figure 3A Optional implementation methods of step S3101, and Figure 2A , Figure 2B , Figure 2C , Figure 3A Other related parts in the embodiments involved will not be described in detail here.

[0179] Step S3202: Select the first resource.

[0180] For optional implementations of step S3202, please refer to [link / reference]. Figure 2A Step S2102 Figure 3A Optional implementation methods of step S3102, and Figure 2A , Figure 2B , Figure 2C , Figure 3A Other related parts in the embodiments involved will not be described in detail here.

[0181] Step S3203: Determine whether to use the first resource to retransmit PSSCH according to the first resource selected by the first terminal.

[0182] For optional implementations of step S3203, please refer to [link / reference]. Figure 2A Steps S2103 and S2104 Figure 3A Optional implementation methods of step S3103, and Figure 2A , Figure 2B , Figure 2C , Figure 3A Other related parts in the embodiments involved will not be described in detail here.

[0183] In this embodiment of the disclosure, step S3201 can be combined with... Figure 3A Steps S3102-S3103 are combined, and step S3202 can be combined with... Figure 3A The steps S3101 and S3103 are combined.

[0184] Figure 3C This is a flowchart illustrating a communication method according to an embodiment of this disclosure. Figure 3C As shown, the embodiments of this disclosure relate to a communication method, which includes:

[0185] Step S3301: Send PSSCH.

[0186] For optional implementations of step S3301, please refer to [link / reference]. Figure 2A Step S2101 Figure 3A Step S3101 Figure 3B Optional implementation methods of step S3201, and Figure 2A , Figure 2B , Figure 2C , Figure 3A , Figure 3B Other related parts in the embodiments involved will not be described in detail here.

[0187] Step S3302: Determine whether to use the first resource to retransmit the PSSCH according to the first resource selected by the first terminal.

[0188] For optional implementations of step S3302, please refer to [link / reference]. Figure 2ASteps S2102, S2103, and S2104 Figure 3A Steps S3102, S3103, and S3104 Figure 3B Optional implementation methods for steps S3202 and S3203, and Figure 2A , Figure 2B , Figure 2C , Figure 3A , Figure 3B Other related parts in the embodiments involved will not be described in detail here.

[0189] In some embodiments, the first terminal sends a Physical Direct Link Shared Channel (PSSCH) to the second terminal. The PSSCH corresponds to N Physical Direct Link Feedback Channel (PSFCH) opportunities, where N is an integer greater than or equal to 1. The first terminal performs a first action on a selected first resource. The first action is whether to use the first resource to retransmit the PSSCH. The first resource is used for PSSCH retransmission.

[0190] In some embodiments, the terminal determines that at least one of the following conditions is met: a first resource exists between the Xth PSFCH timing and the (X+1)th PSFCH timing; and no Hybrid Automatic Repeat Request (HARQ) information for the PSSCH transmission result sent by the second terminal is received between the 1st PSFCH timing and the Xth PSFCH timing, where X is an integer greater than or equal to 1 and less than N.

[0191] In some embodiments, the first action is the action of retransmitting PSSCH using the first resource.

[0192] In some embodiments, the first action is the action of not using the first resource for PSSCH retransmission.

[0193] In some embodiments, if a first condition is met, the first resource is not used to retransmit the PSSCH; the first condition includes the value of X being less than a threshold.

[0194] In some embodiments, the threshold is determined in at least one of the following ways: based on pre-configuration information of resource pools; based on pre-configuration information of resource sets (RB sets); based on pre-configuration information of bandwidth portions (BWPs); or based on predefined rules.

[0195] In some embodiments, the method further includes: retransmitting the PSSCH using a first resource if the first condition is not met.

[0196] In some embodiments, the time interval between any two resources selected by the terminal for the transport block TB transmitted on the PSSCH is greater than or equal to the minimum time interval.

[0197] In some embodiments, the time interval between the initial transmission resource and the retransmission resource of TB is greater than or equal to the minimum time interval, or the time interval between the retransmission resource and the retransmission resource is greater than or equal to the minimum time interval.

[0198] In some embodiments, the minimum time interval is determined based on the timing of the first PSFCH corresponding to the PSSCH.

[0199] Figure 4A This is a flowchart illustrating a communication method according to an embodiment of this disclosure. Figure 4A As shown, the embodiments of this disclosure relate to a communication method, which includes:

[0200] Step S4101: Receive PSSCH.

[0201] For optional implementations of step S4101, please refer to [link / reference]. Figure 2A Step S2101 Figure 3A Step S3101 Figure 3B Step S3201 Figure 3C Optional implementation methods of step S3301, and Figure 2A , Figure 2B , Figure 2C , Figure 3A , Figure 3B as well as Figure 3C Other related parts in the embodiments involved will not be described in detail here.

[0202] Step S4102: The receiving terminal 101 performs PSSCH retransmission based on whether to use the first resource to retransmit the PSSCH.

[0203] For optional implementations of step S4102, please refer to [link / reference]. Figure 2A Step S2104 Figure 3A Step S3104 Figure 3B Step S3203 Figure 3C Optional implementation methods of step S3302, and Figure 2A , Figure 2B , Figure 2C , Figure 3A , Figure 3B as well as Figure 3C Other related parts in the embodiments involved will not be described in detail here.

[0204] The communication method involved in the embodiments of this disclosure may include at least one of steps S4101 to S4102. For example, step S4102 may be implemented as a standalone embodiment, step S4101 may be implemented as a standalone embodiment, and step S4101+S4102 may be implemented as standalone embodiments, but is not limited thereto.

[0205] In some embodiments, steps S4102 and S4101 can be performed in an alternate order or simultaneously.

[0206] In some embodiments, step S4101 is optional, and one or more of these steps may be omitted or substituted in different embodiments.

[0207] In some embodiments, step S4102 is optional, and one or more of these steps may be omitted or substituted in different embodiments.

[0208] In this embodiment of the disclosure, step S4101 can be combined with... Figure 3A Steps S3102-S3103 are combined, and step S4102 can be combined with... Figure 3A The steps S3101 and S3103 are combined.

[0209] Figure 4B This is a flowchart illustrating a communication method according to an embodiment of this disclosure. Figure 4B As shown, the embodiments of this disclosure relate to a communication method, which includes:

[0210] Step S4201: Receive PSSCH.

[0211] For optional implementations of step S4201, please refer to [link / reference]. Figure 2A Step S2101 Figure 3A Step S3101 Figure 3B Step S3201 Figure 3C Step S3301 Figure 4A Optional implementation methods of step S4101, and Figure 2A , Figure 2B , Figure 2C , Figure 3A , Figure 3B , Figure 3C as well as Figure 4A Other related parts in the embodiments involved will not be described in detail here.

[0212] In some embodiments, the second terminal receives the Physical Direct Link Shared Channel (PSSCH) sent by the first terminal; the second terminal receives the PSSCH retransmitted by the first terminal executing a first action; wherein, the first action is the action of whether to use a first resource to retransmit the PSSCH; wherein, the first resource is used for the retransmission of the PSSCH; the PSSCH corresponds to N Physical Direct Link Feedback Channel (PSFCH) opportunities, where N is an integer greater than or equal to 1.

[0213] In some embodiments, a first resource exists between the Xth PSFCH timing and the (X+1)th PSFCH timing; the method further includes: the second terminal performing channel listening on the PSFCH timings corresponding to the N physical direct link feedback channels of the PSSCH; sending Hybrid Automatic Repeat Request (HARQ) information for the PSSCH transmission result on the earliest PSFCH occasion where the channel listening is successful; wherein, from the 1st PSFCH timing to the Xth PSFCH timing, the second terminal does not send the HARQ information to the first terminal; wherein, X is an integer greater than or equal to 1 and less than N.

[0214] In some embodiments, the first action is the action of retransmitting PSSCH using the first resource.

[0215] In some embodiments, the first action is the action of not using the first resource for PSSCH retransmission.

[0216] In some embodiments, if a first condition is met, the first resource is not used to receive the PSSCH retransmitted by the first terminal; the first condition includes the value of X being less than a threshold.

[0217] In some embodiments, the threshold is determined in at least one of the following ways: based on pre-configuration information of resource pools; based on pre-configuration information of resource sets (RB sets); based on pre-configuration information of bandwidth portions (BWPs); or based on predefined rules.

[0218] In some embodiments, if the first condition is not met, the first resource is used to receive the PSSCH retransmitted by the first terminal.

[0219] In some embodiments, the time interval between any two resources selected by the first terminal for the transport block TB transmitted on the PSSCH is greater than or equal to the minimum time interval.

[0220] In some embodiments, the time interval between the initial transmission resource and the retransmission resource of TB is greater than or equal to the minimum time interval, or the time interval between the retransmission resource and the retransmission resource is greater than or equal to the minimum time interval.

[0221] In some embodiments, the minimum time interval is determined based on the timing of the first PSFCH corresponding to the PSSCH.

[0222] One implementation is that the minimum time interval is equal to a+b, where the value of a is determined by the first PSFCH occasion corresponding to the PSSCH, that is, the time interval a is equal to the time interval between the last symbol of the PSSCH and the first symbol of the first PSFCH occasion corresponding to the PSSCH.

[0223] In some embodiments, when a TB supports HARQ-based retransmission, the minimum time interval a+b must be satisfied between any two resources selected for that TB. Here, a refers to the time interval between the last symbol of the PSSCH and the first symbol of the first PSfCH occasion corresponding to that PSSCH, and b is the time required for PSFCH reception and processing, as well as sidechain retransmission preparation, including necessary physical channel multiplexing and any TX-RX / RX-TX switching time. A PSSCH supports a total of N PSFCH occasions, N∈{1,2,3,4}, and the time interval between any two adjacent PSFCH occasions is the PSFCH period.

[0224] Figure 5 This is an interactive schematic diagram illustrating a communication method according to an embodiment of this disclosure. For example... Figure 5 As shown, the embodiments of this disclosure relate to a communication method, which includes:

[0225] In step S5101, the first terminal 101 sends PSSCH to the second terminal 102.

[0226] In some embodiments, the second terminal 102 receives PSSCH.

[0227] In some embodiments, PSSCH corresponds to N physical direct link feedback channel PSFCH timings, where N is an integer greater than or equal to 1.

[0228] For optional implementations of step S5101, please refer to [link / reference]. Figure 2A Step S2101 Figure 3A Step S3101 Figure 3B Step S3201 Figure 3C Step S3301 Figure 4A Step S4101 Figure 4B Optional implementation methods of step S4201, and Figure 2A , Figure 2B , Figure 2C , Figure 3A , Figure 3B , Figure 3C , Figure 4A as well as Figure 4B Other related parts in the embodiments involved will not be described in detail here.

[0229] In step S5102, the first terminal determines whether to use the first resource to retransmit the PSSCH according to the first resource selected by the first terminal.

[0230] In some embodiments, the first terminal 101 performs a first action on a selected first resource.

[0231] In some embodiments, the first action is the action of whether to use the first resource to perform a retransmission of the PSSCH.

[0232] In some embodiments, the first resource is used for PSSCH retransmission.

[0233] For optional implementations of step S5101, please refer to [link / reference]. Figure 2A Steps S2102 to S2104 Figure 3A Steps S3102 to S3014 Figure 3B Steps S3202 to S3203 Figure 3C Optional implementation methods of step S3302, and Figure 2A , Figure 2B , Figure 2C , Figure 3A , Figure 3B , Figure 3C Other related parts in the embodiments involved will not be described in detail here.

[0234] This disclosure also provides a communication method, as described below:

[0235] In some embodiments, when a TB supports HARQ-based retransmission, the minimum time interval a+b must be satisfied between any two resources selected for that TB. Here, a refers to the time interval between the last symbol of the PSSCH and the first symbol of the first PSfCH occasion corresponding to that PSSCH, and b is the time required for PSFCH reception and processing, as well as sidechain retransmission preparation, including necessary physical channel multiplexing and any TX-RX / RX-TX switching time. A PSSCH supports a total of N PSFCH occasions, N∈{1,2,3,4}, and the time interval between any two adjacent PSFCH occasions is the PSFCH period.

[0236] In some embodiments, when the retransmission resource selected by the UE is located between the x-th PSFCH occasion and the (x+1)-th (1≤X<N)-th PSFCH occasion, and no HARQ information has been received on the PSFCH occasions prior to the x-th PSFCH occasion, there are two schemes for the retransmission resource between the x-th PSFCH occasion and the (x+1)-th (1≤X<N)-th PSFCH occasion:

[0237] -A) The UE can use the retransmission resources located between the xth and x+1th PSFCH occasions in the time domain to perform retransmission.

[0238] -B) The UE skips (i.e. does not use) the retransmission resources between the xth and x+1th PSFCH occasions. The UE only uses the time-domain resources located at the physical layer after reporting NACK to the higher layer.

[0239] For example, for -A), the following Figure 2B In this example, the period of a PSFCH occasion is 4 slots. When 1 PSSCH corresponds to 3 PSFCH occasions, the PSSCH located in slot 0 corresponds to 3 PSFCH occasions, located in slots 3, 7, and 11 respectively. Assuming a+b=5 slots, the selected retransmission resources are located in slots 5, 10, and 15. The retransmission resource in slot 5 is located between the 1st and 2nd PSFCH occasions. If the UE does not receive any HARQ information on the 1st PSFCH occasion (slot 3), then after the retransmission resource in slot 5 arrives, the UE can use the retransmission resource in slot 5 to perform a retransmission.

[0240] For example, for -B), the continuation Figure 2CIn this example, the period of a PSFCH occasion is 4 slots. When 1 PSSCH corresponds to 3 PSFCH occasions, the PSSCH located in slot 0 corresponds to 3 PSFCH occasions, located in slot 3, slot 7, and slot 11 respectively. Assuming a+b = 5 slots, and the selected retransmission resources are located in slots 5, 10, and 15, the retransmission resource for slot 5 is located between the first PSFCH occasion and the second PSFCH occasion. If the UE does not receive any HARQ information on the first PSFCH occasion in slot 3, then when the retransmission resource for slot 5 arrives, the UE will not use the retransmission resource in slot 5 to perform a retransmission. The UE will continue to listen for the second PSFCH occasion. If the UE receives a NACK on the second PSFCH occasion, the UE will not continue to listen for the third PSFCH occasion. On the second PSFCH occasion in slot 7, the UE will report a NACK to the higher layer, and the higher layer will perform a retransmission. When the retransmission resource in slot 10 arrives, the higher layer will use the retransmission resource in slot 10 to perform a retransmission.

[0241] Furthermore, PSFCH prb set1 is the set of PRBs associated with the first PSFCH occasion located in slot 3, meaning that the frequency domain resources of the first PSFCH occasion are determined in this set of PRBs; PSFCH prb set2 is the set of PRBs associated with the second PSFCH occasion located in slot 7, meaning that the frequency domain resources of the second PSFCH occasion are determined in this set of PRBs; and PSFCH prb set3 is the set of PRBs associated with the third PSFCH occasion located in slot 11, meaning that the frequency domain resources of the third PSFCH occasion are determined in this set of PRBs.

[0242] In some embodiments, the conditions for a UE to skip the retransmission resource include at least one of the following:

[0243] -a) No HARQ messages were received on the xth PSFCH occasion and on the PSFCH occasions prior to the xth PSFCH occasion.

[0244] -b) If the value of x is less than or equal to the threshold, use option 2; otherwise, use -A.

[0245] In some embodiments, the threshold is based on resource pools, BWPs, pre-configured or predefined.

[0246] Through the embodiments of this disclosure, in the case of selecting the minimum interval a+b that needs to be satisfied for 1TB of execution resources, the terminal behavior is specified, avoiding performance impact due to unclear terminal behavior.

[0247] In the embodiments disclosed herein, some or all of the steps and their optional implementations may be arbitrarily combined with some or all of the steps in other embodiments, or may be arbitrarily combined with the optional implementations in other embodiments.

[0248] This disclosure also provides an apparatus for implementing any of the above methods. For example, an apparatus is provided that includes units or modules for implementing the steps performed by the terminal in any of the above methods. Alternatively, another apparatus is provided that includes units or modules for implementing the steps performed by a network device (e.g., an access network device, a core network functional node, a core network device, etc.) in any of the above methods.

[0249] It should be understood that the division of units or modules in the above device is only a logical functional division. In actual implementation, they can be fully or partially integrated into a single physical entity, or they can be physically separated. Furthermore, the units or modules in the device can be implemented by a processor calling software: for example, the device includes a processor connected to a memory containing instructions. The processor calls the instructions stored in the memory to implement any of the above methods or to implement the functions of the units or modules in the above device. The processor can be, for example, a general-purpose processor, such as a Central Processing Unit (CPU) or a microprocessor, and the memory can be internal or external to the device. Alternatively, the units or modules in the device can be implemented in the form of hardware circuits. The functionality of some or all of the units or modules can be achieved through the design of these hardware circuits, which can be understood as one or more processors. For example, in one implementation, the hardware circuit is an application-specific integrated circuit (ASIC). The functionality of some or all of the units or modules is achieved through the design of the logical relationships between the components within the circuit. In another implementation, the hardware circuit can be implemented using a programmable logic device (PLD). Taking a field-programmable gate array (FPGA) as an example, it can include a large number of logic gates. The connection relationships between the logic gates are configured through configuration files, thereby achieving the functionality of some or all of the units or modules. All units or modules of the above device can be implemented entirely through processor-called software, entirely through hardware circuits, or partially through processor-called software with the remaining parts implemented through hardware circuits.

[0250] In this embodiment, the processor is a circuit with signal processing capabilities. In one implementation, the processor can be a circuit with instruction read and execute capabilities, such as a Central Processing Unit (CPU), a microprocessor, a graphics processing unit (GPU) (which can be understood as a microprocessor), or a digital signal processor (DSP). In another implementation, the processor can implement certain functions through the logical relationships of hardware circuits. The logical relationships of the aforementioned hardware circuits are fixed or reconfigurable. For example, the processor is a hardware circuit implemented using an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as an FPGA. In a reconfigurable hardware circuit, the process of the processor loading a configuration document and configuring the hardware circuit can be understood as the process of the processor loading instructions to implement the functions of some or all of the above units or modules. Furthermore, it can also be a hardware circuit designed for artificial intelligence, which can be understood as an ASIC, such as a Neural Network Processing Unit (NPU), a Tensor Processing Unit (TPU), or a Deep Learning Processing Unit (DPU).

[0251] Figure 6A This is a schematic diagram of the structure of the first terminal proposed in an embodiment of this disclosure. Figure 6A As shown, the first terminal 6100 may include at least one of a transceiver module 6101, a processing module 6102, etc. In some embodiments, the transceiver module is used to send a Physical Direct Link Shared Channel (PSSCH) to the second terminal, where the PSSCH corresponds to N Physical Direct Link Feedback Channel (PSFCH) opportunities, and N is an integer greater than or equal to 1; the first terminal performs a first action on a selected first resource; wherein the first action is whether to use the first resource to retransmit the PSSCH; wherein the first resource is used for PSSCH retransmission. Optionally, the transceiver module is used to perform at least one of the communication steps (e.g., steps S2101, S2104, but not limited thereto) performed by the first terminal 101 in any of the above methods, which will not be elaborated here. Optionally, the processing module is used to perform at least one of the other steps (e.g., steps S2102, S2103, but not limited thereto) performed by the first terminal 101 in any of the above methods, which will not be elaborated here.

[0252] Figure 6B This is a schematic diagram of the structure of the second terminal proposed in an embodiment of this disclosure. Figure 6B As shown, the second terminal 6200 may include a transceiver module 6201. In some embodiments, the transceiver module is used to receive the Physical Direct Link Shared Channel (PSSCH) sent by the first terminal; the second terminal receives the PSSCH retransmitted by the first terminal performing a first action; wherein, the first action is the action of whether to use a first resource to retransmit the PSSCH; wherein, the first resource is used for the retransmission of the PSSCH; the PSSCH corresponds to N Physical Direct Link Feedback Channel (PSFCH) opportunities, where N is an integer greater than or equal to 1. Optionally, the transceiver module is used to perform at least one of the communication steps (e.g., step S2104, but not limited thereto) performed by the second terminal 102 in any of the above methods, which will not be elaborated here.

[0253] In some embodiments, the transceiver module may include a transmitting module and / or a receiving module, which may be separate or integrated. Optionally, the transceiver module may be interchangeable with a transceiver.

[0254] In some embodiments, the processing module may be a single module or may include multiple sub-modules. Optionally, the multiple sub-modules may each perform all or part of the steps required by the processing module. Optionally, the processing module may be interchangeable with a processor.

[0255] Figure 7A This is a schematic diagram of the structure of the communication device 7100 proposed in this embodiment. The communication device 7100 can be a network device (e.g., access network device, core network device, etc.), a terminal (e.g., user equipment, etc.), a chip, chip system, or processor that supports the network device in implementing any of the above methods, or a chip, chip system, or processor that supports the terminal in implementing any of the above methods. The communication device 7100 can be used to implement the methods described in the above method embodiments; for details, please refer to the descriptions in the above method embodiments.

[0256] like Figure 7AAs shown, the communication device 7100 includes one or more processors 7101. The processor 7101 can be a general-purpose processor or a dedicated processor, such as a baseband processor or a central processing unit (CPU). The baseband processor can be used to process communication protocols and communication data, while the CPU can be used to control communication devices (e.g., base stations, baseband chips, terminal devices, terminal device chips, DUs or CUs, etc.), execute programs, and process program data. Optionally, the communication device 7100 can be used to execute any of the above methods. Optionally, one or more processors 7101 can be used to invoke instructions to cause the communication device 7100 to execute any of the above methods.

[0257] In some embodiments, the communication device 7100 further includes one or more transceivers 7102. When the communication device 7100 includes one or more transceivers 7102, the transceiver 7102 performs at least one of the communication steps (e.g., steps S2102, S2103, but not limited thereto) in the above method, such as sending and / or receiving, while the processor 7101 performs at least one of other steps (e.g., step S2101, but not limited thereto). In optional embodiments, the transceiver may include a receiver and / or a transmitter, which may be separate or integrated. Optionally, the terms transceiver, transceiver unit, transceiver, transceiver circuit, interface circuit, interface, etc., can be used interchangeably; the terms transmitter, sending unit, transmitter, sending circuit, etc., can be used interchangeably; and the terms receiver, receiving unit, receiver, receiving circuit, etc., can be used interchangeably.

[0258] In some embodiments, the communication device 7100 further includes one or more memories 7103 for storing data. Optionally, all or part of the memories 7103 may be located outside the communication device 7100. In optional embodiments, the communication device 7100 may include one or more interface circuits 7104. Optionally, the interface circuits 7104 are connected to the memories 7103 and can be used to receive data from the memories 7103 or other devices, and to send data to the memories 7103 or other devices. For example, the interface circuits 7104 can read data stored in the memories 7103 and send the data to the processor 7101.

[0259] The communication device 7100 described in the above embodiments may be a network device or a terminal, but the scope of the communication device 7100 described in this disclosure is not limited thereto, and the structure of the communication device 7100 may vary. Figure 7AThe limitations. The communication device can be a standalone device or part of a larger device. For example, the communication device can be: (1) a standalone integrated circuit IC, or chip, or chip system or subsystem; (2) a collection of one or more ICs, optionally including storage components for storing data and programs; (3) an ASIC, such as a modem; (4) a module that can be embedded in other devices; (5) a receiver, terminal device, smart terminal device, cellular phone, wireless device, handheld device, mobile unit, vehicle device, network device, cloud device, artificial intelligence device, etc.; (6) others, etc.

[0260] Figure 7B This is a schematic diagram of the structure of chip 7200 according to an embodiment of this disclosure. For cases where the communication device 7100 can be a chip or a chip system, please refer to... Figure 7B The diagram shown is a schematic representation of the structure of chip 7200, but it is not limited to this.

[0261] Chip 7200 includes one or more processors 7201. Chip 7200 is used to perform any of the above methods.

[0262] In some embodiments, chip 7200 further includes one or more interface circuits 7202. Optionally, terms such as interface circuit, interface, and transceiver pin can be used interchangeably. In some embodiments, chip 7200 further includes one or more memories 7203 for storing data. Optionally, all or part of the memories 7203 may be located outside chip 7200. Optionally, interface circuit 7202 is connected to memory 7203, and interface circuit 7202 can be used to receive data from memory 7203 or other devices, and interface circuit 7202 can be used to send data to memory 7203 or other devices. For example, interface circuit 7202 can read data stored in memory 7203 and send the data to processor 7201.

[0263] In some embodiments, the interface circuit 7202 performs at least one of the communication steps (e.g., steps S2102, S2103, but not limited thereto) in the above-described method, such as sending and / or receiving. For example, the interface circuit 7202 performing the communication steps (e.g., sending and / or receiving) in the above-described method means that the interface circuit 7202 performs data interaction between the processor 7201, the chip 7200, the memory 7203, or the transceiver device. In some embodiments, the processor 7201 performs at least one of other steps (e.g., step S2101, but not limited thereto).

[0264] The modules and / or devices described in the various embodiments, such as virtual devices, physical devices, and chips, can be combined or separated arbitrarily as needed. Optionally, some or all steps can also be performed collaboratively by multiple modules and / or devices, which is not limited here.

[0265] This disclosure also proposes a storage medium storing instructions that, when executed on the communication device 7100, cause the communication device 7100 to perform any of the above methods. Optionally, the storage medium is an electronic storage medium. Optionally, the storage medium is a computer-readable storage medium, but not limited thereto; it may also be a storage medium readable by other devices. Optionally, the storage medium may be a non-transitory storage medium, but not limited thereto; it may also be a temporary storage medium.

[0266] This disclosure also provides a program product that, when executed by the communication device 7100, causes the communication device 7100 to perform any of the above methods. Optionally, the program product is a computer program product.

[0267] This disclosure also proposes a computer program that, when run on a computer, causes the computer to perform any of the above methods.

Claims

1. A communication method, characterized in that, The method includes: The first terminal sends a Physical Direct Link Shared Channel (PSSCH) to the second terminal. The PSSCH corresponds to N Physical Direct Link Feedback Channel (PSFCH) timings, where N is an integer greater than or equal to 1. The first terminal determines that at least one of the following conditions is met: a first resource exists between the Xth PSFCH timing and the (X+1)th PSFCH timing; and no Hybrid Automatic Repeat Request (HARQ) information for the PSSCH transmission result sent by the second terminal is received between the 1st PSFCH timing and the Xth PSFCH timing, where X is an integer greater than or equal to 1 and less than N. Based on the first resource selected by the first terminal, determine whether to use the first resource to retransmit the PSSCH. The first resource is used for PSSCH retransmission; Wherein, if the first condition is met, the first resource is not used for PSSCH retransmission; If the first condition is not met, the first resource is used to retransmit the PSSCH. The first condition includes the value of X being less than a threshold, wherein the threshold is less than or equal to N.

2. The method according to claim 1, characterized in that, The threshold is determined using at least one of the following methods: Determined based on pre-configuration information from the resource pool; Determined based on pre-configuration information from resource set (RB set); Determined based on the pre-configuration information of the bandwidth portion of the BWP; Determined based on predefined rules.

3. The method according to claim 1 or 2, characterized in that, The time interval between any two resources selected by the first terminal for the transport block TB transmitted on the PSSCH is greater than or equal to the minimum time interval.

4. The method according to claim 3, characterized in that, The minimum time interval is determined based on the timing of the first PSFCH corresponding to the PSSCH.

5. A communication method, characterized in that, The method includes: The second terminal receives the Physical Direct Link Shared Channel (PSSCH) sent by the first terminal; The second terminal receives the PSSCH from the first terminal, indicating whether to use the first resource to retransmit the PSSCH. The first resource is used for PSSCH retransmission, and the first resource exists between the Xth PSFCH timing and the X+1th PSFCH timing; The PSSCH corresponds to N Physical Direct Link Feedback Channel (PSFCH) occasions, where N is an integer greater than or equal to 1. The second terminal performs channel listening on the N PSSCH occasions corresponding to the PSSCH. On the earliest PSFCH occasion where channel listening is successful, the second terminal sends a Hybrid Automatic Repeat Request (HARQ) message for the PSSCH transmission result. Among these occasions, from the first PSFCH occasion to the Xth PSFCH occasion, the second terminal does not send the HARQ message to the first terminal, where X is an integer greater than or equal to 1 and less than N. The method further includes: Wherein, if the first condition is met, the first resource is not used to receive the PSSCH retransmitted by the first terminal; If the first condition is not met, the first resource is used to receive the PSSCH retransmitted by the first terminal. The first condition includes the value of X being less than a threshold, wherein the threshold is less than or equal to N.

6. The method according to claim 5, characterized in that, The threshold is determined using at least one of the following methods: Determined based on pre-configuration information from the resource pool; Determining based on pre-configuration information of resource set (RB set) Determined based on the pre-configuration information of the bandwidth portion of the BWP; Determined based on predefined rules.

7. The method according to claim 5 or 6, characterized in that, The time interval between any two resources selected by the first terminal for the transport block TB transmitted on the PSSCH is greater than or equal to the minimum time interval.

8. The method according to claim 7, characterized in that, The minimum time interval is determined based on the timing of the first PSFCH corresponding to the PSSCH.

9. A first terminal, characterized in that, include: The transceiver module sends a Physical Direct Link Shared Channel (PSSCH) to the second terminal. The PSSCH corresponds to N Physical Direct Link Feedback Channel (PSFCH) timings, where N is an integer greater than or equal to 1. The first terminal determines that at least one of the following conditions is met: a first resource exists between the Xth PSFCH timing and the (X+1)th PSFCH timing; and no Hybrid Automatic Repeat Request (HARQ) information indicating the transmission result of the PSSCH sent by the second terminal is received between the 1st PSFCH timing and the Xth PSFCH timing, where X is an integer greater than or equal to 1 and less than N. The processing module is configured to determine whether to use the first resource to retransmit the PSSCH according to the first resource selected by the first terminal; The first resource is used for PSSCH retransmission; Wherein, if the first condition is met, the first resource is not used for PSSCH retransmission; If the first condition is not met, the first resource is used to retransmit the PSSCH. The first condition includes the value of X being less than a threshold, wherein the threshold is less than or equal to N.

10. A second terminal, characterized in that, include: The transceiver module is used to receive the Physical Direct Link Shared Channel (PSSCH) sent by the first terminal, and to receive the PSSCH from the first terminal indicating whether to use the first resource to retransmit the PSSCH. The first resource is used for PSSCH retransmission, and the first resource exists between the Xth PSFCH timing and the X+1th PSFCH timing; The PSSCH corresponds to N Physical Direct Link Feedback Channel (PSFCH) occasions, where N is an integer greater than or equal to 1. The second terminal performs channel listening on the N PSSCH occasions corresponding to the PSSCH. On the earliest PSFCH occasion where channel listening is successful, the second terminal sends a Hybrid Automatic Repeat Request (HARQ) message for the PSSCH transmission result. Among these occasions, from the first PSFCH occasion to the Xth PSFCH occasion, the second terminal does not send the HARQ message to the first terminal, where X is an integer greater than or equal to 1 and less than N. Wherein, if the first condition is met, the first resource is not used to receive the PSSCH retransmitted by the first terminal; If the first condition is not met, the first resource is used to receive the PSSCH retransmitted by the first terminal. The first condition includes the value of X being less than a threshold, wherein the threshold is less than or equal to N.

11. A terminal, characterized in that, include: One or more processors; The processor is used to execute the communication method according to any one of claims 1 to 4 or 5 to 8.

12. A communication system, characterized in that, The device includes a first terminal and a second terminal, wherein the first terminal is configured to implement the communication method of any one of claims 1 to 4, and the second terminal is configured to implement the communication method of any one of claims 5 to 8.

13. A storage medium storing instructions, characterized in that, When the instructions are executed on the communication device, the communication device performs the communication method as described in any one of claims 1 to 4 or 5 to 8.

Images