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 sends a physical sidelink shared channel (PSSCH) to a second terminal, the PSSCH corresponding to N physical sidelink feedback channel (PSFCH) occasions, and N being an integer greater than or equal to 1; and the first terminal executes a first behavior on a selected first resource, wherein the first behavior is a behavior of whether to use the first resource to perform retransmission of the PSSCH, and the first resource is used for the retransmission of the PSSCH. According to the embodiments of the present disclosure, terminal behaviors are specified, so that the impact on the performance caused by unclear terminal behaviors is avoided.

Description

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

[0001] The present disclosure relates to the field of communication technologies, and in particular to a communication method, a first terminal, a second terminal, and a communication system. Background Art

[0002] In the communications field, the Physical Sidelink Share Channel (PSSCH) is commonly used to transmit data between terminals. During data transmission, through the mapping of PSSCH to PSFCH, each PSSCH is assigned at least one Physical Sidelink Feedback Channel (PSFCH) occasion to feedback the HARQ information corresponding to the PSSCH.

[0003] Summary of the Invention

[0004] In the case where one PSCCH corresponds to multiple PSFCH opportunities, the behavior of the terminal with respect to retransmission resources is unclear, which may lead to a problem of reduced communication performance.

[0005] The embodiments of the present disclosure provide a communication method, a first terminal, a second terminal, and a communication system.

[0006] According to a first aspect of an embodiment of the present disclosure, a communication method is proposed, 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) opportunities, where N is an integer greater than or equal to 1; determining whether to use a first resource to retransmit the PSSCH according to a first resource selected by the first terminal; and using the first resource for retransmitting the PSSCH.

[0007] According to a second aspect of an embodiment of the present disclosure, a communication method is proposed, comprising: a second terminal receiving a physical direct link shared channel (PSSCH) sent by a first terminal; the second terminal receiving the PSSCH on which the first terminal determines 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) opportunities, where N is an integer greater than or equal to 1.

[0008] According to a third aspect of an embodiment of the present disclosure, a communication method is proposed, 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) opportunities, where N is an integer greater than or equal to 1; the second terminal receiving the physical direct link shared channel (PSSCH) sent by the first terminal; the first terminal determining, based on a selected first resource, whether to use the first resource to retransmit the PSSCH; wherein the first resource is used for retransmitting the PSSCH.

[0009] According to a fourth aspect of an embodiment of the present disclosure, a first terminal is proposed, comprising: a transceiver module, configured to send a physical direct link shared channel (PSSCH) to a second terminal, wherein the PSSCH corresponds to N physical direct link feedback channel (PSFCH) opportunities, where N is an integer greater than or equal to 1; and a processing module, configured to determine, according to a first resource selected by the first terminal, whether to use the first resource to retransmit the PSSCH; wherein the first resource is used for retransmitting the PSSCH.

[0010] According to a fifth aspect of an embodiment of the present disclosure, a second terminal is proposed, comprising: a transceiver module for receiving a physical direct link shared channel (PSSCH) sent by a first terminal, and receiving the PSSCH indicating whether the first terminal uses 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) opportunities, where N is an integer greater than or equal to 1.

[0011] According to a sixth aspect of an embodiment of the present disclosure, a first terminal is proposed, comprising: one or more processors; wherein the processor is configured to execute the communication method of the first aspect.

[0012] According to a seventh aspect of an embodiment of the present disclosure, a second terminal is proposed, comprising: one or more processors; wherein the processor is configured to execute the communication method of the second aspect.

[0013] According to an eighth aspect of an embodiment 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.

[0014] According to a ninth aspect of an embodiment of the present disclosure, a storage medium is provided, wherein the storage medium stores instructions, and wherein when the instructions are executed on a communication device, the communication device executes the communication method of any one of the first and second aspects.

[0015] Through the embodiments of the present disclosure, terminal behavior is specified, thereby avoiding performance impact due to unclear terminal behavior. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following drawings required for describing the embodiments are introduced. The following drawings are merely some embodiments of the present disclosure and do not impose specific limitations on the protection scope of the present disclosure.

[0017] FIG1 is an exemplary schematic diagram of the architecture of a communication system provided according to an embodiment of the present disclosure.

[0018] FIG2A is an interactive schematic diagram illustrating a communication method according to an embodiment of the present disclosure.

[0019] FIG2B is a schematic diagram showing a first resource selection according to an embodiment of the present disclosure.

[0020] FIG2C is a schematic diagram showing other resource selection according to an embodiment of the present disclosure.

[0021] FIG3A is a flow chart illustrating a communication method according to an embodiment of the present disclosure.

[0022] FIG3B is a flow chart illustrating a communication method according to an embodiment of the present disclosure.

[0023] FIG3C is a flow chart illustrating a communication method according to an embodiment of the present disclosure.

[0024] FIG4A is a flow chart showing a communication method according to an embodiment of the present disclosure.

[0025] FIG4B is a flow chart illustrating a communication method according to an embodiment of the present disclosure.

[0026] FIG5 is an interactive diagram illustrating a communication method according to an embodiment of the present disclosure.

[0027] FIG6A is a schematic structural diagram of a first terminal proposed in an embodiment of the present disclosure.

[0028] FIG6B is a schematic structural diagram of a second terminal proposed in an embodiment of the present disclosure.

[0029] FIG7A is a schematic structural diagram of a communication device proposed in an embodiment of the present disclosure.

[0030] FIG7B is a schematic diagram of the structure of the chip proposed in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0031] The embodiments of the present disclosure provide a communication method, a first terminal, a second terminal, and a communication system.

[0032] In the first aspect, an embodiment of the present disclosure proposes that a first terminal sends a physical direct link shared channel PSSCH to a second terminal, where the PSSCH corresponds to N physical direct link feedback channel PSFCH opportunities, where N is an integer greater than or equal to 1; according to a first resource selected by the first terminal, determine whether to use the first resource to retransmit the PSSCH; and the first resource is used for retransmission of the PSSCH.

[0033] In combination 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, where 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 behavior on the selected first resource; wherein the first behavior is whether to use the first resource to retransmit the PSSCH; wherein the first resource is used for PSSCH retransmission.

[0034] In the above embodiment, by clarifying the retransmission behavior of the terminal when one PSCCH corresponds to multiple PSFCH opportunities, it is avoided that the terminal causes redundant retransmissions or missing retransmissions due to unclear behavior, thereby affecting communication performance.

[0035] In combination with some embodiments of the first aspect, in some embodiments, the first terminal determines that at least one of the following is satisfied: there is a first resource between the Xth PSFCH opportunity and the X+1th PSFCH opportunity; from the 1st PSFCH opportunity to the Xth PSFCH opportunity, the hybrid automatic repeat request HARQ information of the PSSCH transmission result sent by the second terminal is not received, wherein X is an integer greater than or equal to 1 and less than N.

[0036] In combination with some embodiments of the first aspect, in some embodiments, the first behavior is an behavior of retransmitting the PSSCH using the first resource.

[0037] In combination with some embodiments of the first aspect, in some embodiments, the first behavior is an behavior of not using the first resource to retransmit the PSSCH.

[0038] In combination with some embodiments of the first aspect, in some embodiments, when a first condition is met, the first resource is not used to retransmit the PSSCH; the first condition includes that the value of X is less than a threshold.

[0039] In the above embodiment, 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 opportunities, avoiding degradation of communication performance due to unclear terminal behavior.

[0040] In combination with some embodiments of the first aspect, in some embodiments, the threshold is determined in at least one of the following ways: based on pre-configuration information of the resource pool; based on pre-configuration information of the resource set RB set; based on pre-configuration information of the bandwidth part BWP; based on predefined rules.

[0041] In combination with some embodiments of the first aspect, in some embodiments, when the first condition is not met, the first resource is used to retransmit the PSSCH.

[0042] In the above embodiment, 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 opportunities, avoiding degradation of communication performance due to unclear terminal behavior.

[0043] In combination with some embodiments of the first aspect, in some embodiments, the time interval between any two resources selected by the first terminal for a transport block TB transmitted on the PSSCH is greater than or equal to a minimum time interval.

[0044] In combination with some embodiments of the first aspect, in some embodiments, the minimum time interval is determined based on the first PSFCH opportunity corresponding to the PSSCH.

[0045] On the second aspect, an embodiment of the present 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 on which the first terminal determines 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 opportunities, where N is an integer greater than or equal to 1.

[0046] In combination with some embodiments of the second aspect, in some embodiments, the second terminal receives a 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 behavior; wherein the first behavior is whether to use the first resource to retransmit the PSSCH; wherein the first resource is used for the PSSCH retransmission; the PSSCH corresponds to N physical direct link feedback channel PSFCH opportunities, and N is an integer greater than or equal to 1.

[0047] In combination with some embodiments of the second aspect, in some embodiments, there is a first resource between the Xth PSFCH opportunity and the X+1th PSFCH opportunity; the method also includes: the second terminal performs channel monitoring on N physical direct link feedback channel PSFCH occasions corresponding to the PSSCH; sends hybrid automatic repeat request HARQ information for the PSSCH transmission result on the earliest PSFCH occasion where the channel monitoring is successful; wherein, from the 1st PSFCH opportunity to the Xth PSFCH opportunity, 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.

[0048] In combination with some embodiments of the second aspect, in some embodiments, the first behavior is an behavior of retransmitting the PSSCH using the first resource.

[0049] In combination with some embodiments of the second aspect, in some embodiments, the first behavior is an behavior of not using the first resource for PSSCH retransmission.

[0050] In combination with some embodiments of the second aspect, in some embodiments, when a first condition is met, the first resource is not used to receive the PSSCH retransmitted by the first terminal; the first condition includes that the value of X is less than a threshold.

[0051] In combination with some embodiments of the second aspect, in some embodiments, the threshold is determined in at least one of the following ways: based on pre-configuration information of the resource pool; based on pre-configuration information of the resource set RB set; based on pre-configuration information of the bandwidth part BWP; based on predefined rules.

[0052] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes:

[0053] When the first condition is not met, the PSSCH retransmitted by the first terminal is received using the first resource.

[0054] In combination 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.

[0055] In combination with some embodiments of the second aspect, in some embodiments, the minimum time interval is determined based on the first PSFCH opportunity corresponding to the PSSCH.

[0056] In a third aspect, an embodiment of the present disclosure proposes a communication method, comprising: a first terminal sends a physical direct link shared channel PSSCH to a second terminal, where the PSSCH corresponds to N physical direct link feedback channel PSFCH opportunities, where N is an integer greater than or equal to 1; the second terminal receives the physical direct link shared channel PSSCH sent by the first terminal; the first terminal performs a first behavior on a selected first resource; wherein the first behavior is whether to use the first resource to retransmit the PSSCH; wherein the first resource is used for the PSSCH retransmission.

[0057] In a fourth aspect, an embodiment of the present disclosure proposes a first terminal, comprising: a transceiver module, 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, where N is an integer greater than or equal to 1; 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 retransmission of the PSSCH.

[0058] In the fifth aspect, an embodiment of the present disclosure proposes a second terminal, including: a transceiver module, used to receive a physical direct link shared channel PSSCH sent by a first terminal, and receive the PSSCH of the first terminal to determine 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 opportunities, and N is an integer greater than or equal to 1.

[0059] In a sixth aspect, an embodiment of the present disclosure proposes a first terminal, comprising: one or more processors; wherein the processor is used to execute the communication method of the first aspect.

[0060] In a seventh aspect, an embodiment of the present disclosure proposes a second terminal, comprising: one or more processors; wherein the processor is used to execute the communication method of the second aspect.

[0061] In an eighth aspect, an embodiment of the present disclosure proposes a communication system, comprising: 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.

[0062] In a ninth aspect, an embodiment of the present disclosure proposes a storage medium storing instructions, which, when the instructions are executed on a communication device, enables the communication device to execute any one of the communication methods of the first aspect and the second aspect.

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

[0064] The present 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" and "data processing method" are interchangeable; the terms "communication device" and "information processing device" and "data processing" are interchangeable; and the terms "information processing system" and "communication system" are interchangeable.

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

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

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

[0068] In the embodiments of the present disclosure, unless otherwise specified, elements expressed in the singular, such as "a", "an", "the", "above", "said", "the", "the", etc., may mean "one and only one", or "one or more", "at least one", etc. For example, when using articles such as "a", "an", "the" in English in translation, the noun following the article may be understood as a singular expression or a plural expression.

[0069] In the embodiments of the present disclosure, “plurality” refers to two or more.

[0070] In some embodiments, the terms "at least one," "one or more," "a plurality of," "multiple," etc. may be used interchangeably.

[0071] In some embodiments, descriptions such as "at least one of A and B," "A and / or B," "A in one case, B in another case," or "in response to one case A, in response to another case B" may include the following technical solutions depending on the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed); and in some embodiments, A and B (both A and B are executed). The above is also applicable when there are more branches such as A, B, and C.

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

[0073] The prefixes such as "first" and "second" in the embodiments of the present disclosure are only used to distinguish different description objects and do not constitute any restriction on the position, order, priority, quantity or content of the description objects. For the statement of the description object, please refer to the description in the context of the claims or embodiments, and no unnecessary restriction should be constituted due to the use of prefixes. For example, if the description object is a "field", the ordinal number before the "field" in the "first field" and the "second field" does not limit the position or order between the "fields". "First" and "second" do not limit whether the "fields" they modify are in the same message, nor do they limit the order of the "first field" and the "second field". For another example, if the description object is a "level", the ordinal number before the "level" in the "first level" and the "second level" does not limit the priority between the "levels". For another example, the number of description objects is not limited by the ordinal number and can be one or more. Taking "first device" as an example, the number of "devices" can be one or more. In addition, the objects modified by different prefixes can be the same or different. For example, if the description object is "device", then the "first device" and the "second device" can be the same device or different devices, and their types can be the same or different. For another example, if the description object is "information", then the "first information" and the "second information" can be the same information or different information, and their contents can be the same or different.

[0074] In some embodiments, “including A,” “comprising A,” “used to indicate A,” and “carrying A” can be interpreted as directly carrying A or indirectly indicating A.

[0075] In some embodiments, terms such as "time / frequency" and "time / frequency domain" refer to the time domain and / or the frequency domain.

[0076] In some embodiments, terms such as "in response to...", "in response to determining...", "in the case of...", "at the time of...", "when...", "if...", "if...", etc. can be used interchangeably.

[0077] In some embodiments, terms such as "greater than", "greater than or equal to", "not less than", "more than", "more than or equal to", "not less than", "higher than", "higher than or equal to", "not less than", and "above" can be replaced with each other, and terms such as "less than", "less than or equal to", "not greater than", "less than", "less than or equal to", "not more than", "lower than", "lower than or equal to", "not higher than", and "below" can be replaced with each other.

[0078] In some embodiments, devices, etc. can be interpreted as physical or virtual, and their names are not limited to the names recorded in the embodiments. Terms such as "device", "equipment", "device", "circuit", "network element", "node", "function", "unit", "section", "system", "network", "chip", "chip system", "entity", and "subject" can be used interchangeably.

[0079] In some embodiments, "network" can be interpreted as devices included in the network (eg, access network equipment, core network equipment, etc.).

[0080] In some embodiments, the terms "access network device (AN device)", "radio access network device (RAN device)", "base station (BS)", "radio base station" "fixed station", "node", "access point", "transmission point (TP)", "reception point (RP)", "transmission / reception point (TRP)" "panel", "antenna panel", "antenna array", "cell", "macro cell", "small cell", "femto cell", "pico cell", "sector", "cell group", "serving cell", "carrier", "component carrier", "bandwidth part (BWP)" and the like may be used interchangeably.

[0081] In some embodiments, the terms "terminal", "terminal device", "user equipment (UE)", "user terminal", "mobile station (MS)", "mobile terminal (MT)", subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, etc. can be used interchangeably.

[0082] In some embodiments, the access network device, the core network device, or the network device can be replaced by a terminal. For example, the various embodiments of the present disclosure can also be applied to a structure in which the communication between the access network device, the core network device, or the network device and the terminal is replaced by communication between multiple terminals (for example, device-to-device (D2D), vehicle-to-everything (V2X), etc.). In this case, it is also possible to set the structure in which the terminal has all or part of the functions of the access network device. In addition, terms such as "uplink" and "downlink" can also be replaced by terms corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. can be replaced by side channels, and uplinks, downlinks, etc. can be replaced by side links.

[0083] In some embodiments, the terminal may be replaced by an access network device, a core network device, or a network device. In this case, the access network device, the core network device, or the network device may have a structure that has all or part of the functions of the terminal.

[0084] In some embodiments, obtaining data, information, etc. may comply with the laws and regulations of the country where the data is obtained.

[0085] In some embodiments, data, information, etc. may be obtained with the user's consent.

[0086] In addition, each element, each row, or each column in the table of the embodiment of the present disclosure can be implemented as an independent embodiment, and the combination of any elements, any rows, and any columns can also be implemented as an independent embodiment.

[0087] FIG1 is a schematic diagram showing the architecture of a communication system according to an embodiment of the present disclosure.

[0088] As shown in FIG1 , a communication system 100 includes a first terminal 101 and a second terminal 102 .

[0089] In some embodiments, the first terminal 101 and the second terminal 102 include, for example, a mobile phone, a wearable device, an Internet of Things device, a car with communication function, a smart car, a tablet computer, a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical surgery, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, and at least one of a wireless terminal device in a smart home, but are not limited thereto.

[0090] It can be understood that the communication system described in the embodiment of the present disclosure is for the purpose of more clearly illustrating the technical solution of the embodiment of the present disclosure, and does not constitute a limitation on the technical solution proposed in the embodiment of the present disclosure. Ordinary technicians in this field can know that with the evolution of the system architecture and the emergence of new business scenarios, the technical solution proposed in the embodiment of the present disclosure is also applicable to similar technical problems.

[0091] The following embodiments of the present disclosure may be applied to the communication system 100 shown in FIG1 , or a portion thereof, but are not limited thereto. The entities shown in FIG1 are illustrative only. The communication system may include all or part of the entities shown in FIG1 , or may include other entities outside of FIG1 . The number and form of the entities are arbitrary, and the entities may be physical or virtual. The connection relationships between the entities are illustrative only. The entities may be connected or disconnected, and the connection may be in any manner, including direct or indirect, wired or wireless.

[0092] The embodiments of the present disclosure can be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 5G new radio (NR), future radio access (FRA), new radio access technology (RAT), new radio (NR), new radio access (NX), future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), Public Land Mobile Network (PLMN) networks, Device-to-Device (D2D) systems, Machine-to-Machine (M2M) systems, Internet of Things (IoT) systems, Vehicle-to-Everything (V2X), systems utilizing other communication methods, and next-generation systems based on and extending these methods. Furthermore, multiple systems may be combined (for example, a combination of LTE or LTE-A with 5G).

[0093] In some embodiments, in a legacy sidelink communication scenario, one physical sidelink control channel (PSSCH) corresponds to only one physical sidelink feedback channel (PSFCH) occasion.

[0094] In some embodiments, in the legacy sidelink, when a transport block (TB) supports retransmission based on hybrid automatic repeat request (HARQ) feedback, a minimum time interval must be met between any two resources selected for the TB.

[0095] Exemplarily, the minimum time interval can be a+b. The time represented by "a" is: 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 resource transmitted by PSSCH. The second symbol is the first symbol received at the PSFCH occasion corresponding to the PSSCH transmission resource. That is, the time interval between the last symbol of PSSCH and the first symbol of the first PSFCH occasion corresponding to the PSSCH. "b" is the time required for PSFCH reception and processing and side chain retransmission preparation. For example, "b" may include at least one of the following: the multiplexing of necessary physical channels and any time for switching between sending to receiving (TX-RX), or receiving to sending (RX-TX).

[0096] In some embodiments, in the sidelink unlicensed band, 1 PSCCH may correspond to N PSFCH opportunities, where N is an integer greater than or equal to 1.

[0097] It is understandable that, when one PSCCH corresponds to multiple (e.g., N is greater than or equal to 2) PSFCH occasions, if the minimum time interval defined in the legacy sidelink is continued to be used, the selected retransmission resource will be located between the first PSFCH occasion and the last PSFCH occasion. If the selected retransmission resource is located between the first PSFCH occasion and the last PSFCH occasion, the physical layer may not report HARQ information on the PSFCH occasion, but the selected retransmission resource has already arrived. If the physical layer has not reported HARQ information on the PSFCH occasion, but the selected retransmission resource has already arrived, the upper layer of the transmitting terminal cannot determine whether to use the retransmission resource for retransmission.

[0098] Based on this, a communication method is proposed to clarify the behavior of the terminal in this scenario.

[0099] FIG2A is an interactive diagram of a communication method according to an embodiment of the present disclosure. As shown in FIG2A , the embodiment of the present disclosure relates to a communication method, and the method includes:

[0100] Step S2101 , the first terminal 101 sends a PSSCH to the second terminal 102 .

[0101] In some embodiments, terms such as "send", "transmit", "report", "download", "transmit", "bidirectional transmission", "send and / or receive" can be used interchangeably.

[0102] In some embodiments, the second terminal 102 receives a physical sidelink shared channel (PSSCH).

[0103] In some embodiments, the second terminal 102 receives the PSSCH sent from the first terminal 101.

[0104] In some embodiments, "obtain", "get", "get", "receive", "transmit", "bidirectional transmission", "send and / or receive" can be interchangeable, and can be interpreted as receiving from other entities, obtaining from protocols, obtaining from higher layers, obtaining by self-processing, autonomous implementation, etc.

[0105] In some embodiments, in an unlicensed frequency band, the first terminal 101 sends a PSSCH to the second terminal 102 .

[0106] In some embodiments, the PSSCH corresponds to N physical sidelink feedback channel (PSFCH) occasions, where N is an integer greater than or equal to 1.

[0107] Step S2102: The first terminal 101 selects a first resource.

[0108] In some embodiments, the first resource is used for PSSCH retransmission.

[0109] In some embodiments, there are multiple PSSCH resources on the PSSCH sent by the first terminal 101 to the second terminal 102.

[0110] In some embodiments, the first resource satisfies at least one of the following: the first resource exists between the Xth PSFCH opportunity and the X+1th PSFCH opportunity; the hybrid automatic repeat request HARQ information of the PSSCH transmission result sent by the second terminal is not received on the 1st to the Xth PSFCH opportunities, where X is an integer greater than or equal to 1 and less than N.

[0111] In some embodiments, the first resource is a retransmission resource that satisfies a minimum time interval.

[0112] In some embodiments, the time interval between the first resource and the PSSCH is greater than or equal to a minimum time interval.

[0113] In some embodiments, the minimum time interval is determined based on the first PSFCH opportunity corresponding to the PSSCH.

[0114] In some embodiments, the minimum time interval corresponds to at least one of the following:

[0115] The first PSFCH opportunity corresponding to the PSSCH, and the last symbol of the PSSCH.

[0116] In some embodiments, the definition of the minimum time interval may refer to the minimum time interval defined in the above embodiments, such as "a+b", which will not be repeated here.

[0117] In some embodiments, the time interval between any two resources selected by the terminal 101 for a transport block (TB) transmitted on the PSSCH is greater than or equal to a minimum time interval.

[0118] Step S2103: The first terminal 101 executes a first behavior on the selected first resource.

[0119] The first behavior is whether to use the first resource to retransmit the PSSCH.

[0120] In some embodiments, the first terminal 101 performing the first behavior 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.

[0121] In some embodiments, the first behavior includes at least one of the following:

[0122] An act of retransmitting the PSSCH using the first resource, and an act of not retransmitting the PSSCH using the first resource.

[0123] In some embodiments, the first terminal 101 may use the first resource to retransmit the PSSCH on the selected first resource, or may not use the first resource to retransmit the PSSCH.

[0124] In some embodiments, when the first condition is not met, the first terminal 101 retransmits the PSSCH using the first resource.

[0125] In some embodiments, the first condition includes that the value of X is less than a threshold.

[0126] In some embodiments, the threshold is determined using at least one of the following methods:

[0127] Determined based on pre-configured information of the resource pool;

[0128] Determined based on pre-configured information of Resource Block set (RB)

[0129] Determined based on pre-configured information of the bandwidth part (Bandwidth Part, BWP);

[0130] Determined based on predefined rules.

[0131] In some embodiments, the first terminal 101 retransmits the PSSCH using the first resource on the selected first resource.

[0132] For example, FIG2B is a schematic diagram of a first resource selection according to an embodiment of the present disclosure. As shown in FIG2B , the PSFCH occasion period is 4 time slots. When 1 PSSCH corresponds to 3 PSFCH occasions (i.e., the PSFCH occasion corresponding to slot 3, the PSFCH occasion corresponding to slot 7, and the PSFCH occasion corresponding to slot 11), assuming that the minimum time interval "a+b" is 5 slots, the corresponding retransmission resources selected are the retransmission resources corresponding to slot 5, the retransmission resources corresponding to slot 10, and the retransmission resources corresponding to slot 15.

[0133] Furthermore, based on FIG. 2B , it can be seen that the retransmission resource corresponding to slot 5 is located between the PSFCH occasion corresponding to slot 3 and the PSFCH occasion corresponding to slot 7. First terminal 101 does not receive HARQ information on the PSFCH occasion corresponding to slot 3, and while waiting for the retransmission resource corresponding to slot 5 to arrive, first terminal 101 can retransmit based on the retransmission resource corresponding to slot 5. It is understood that in this case, slot 5 can be understood as the first resource.

[0134] It should be noted that in Figure 2B, 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.

[0135] In some embodiments, terms such as "frame", "radio frame", "subframe", "slot", "sub-slot", "mini-slot", "symbol", "symbol", and "transmission time interval (TTI)" can be used interchangeably.

[0136] In some embodiments, the first terminal 101 does not retransmit the PSSCH using the first resource on the selected first resource.

[0137] Exemplarily, following the embodiment of FIG. 2B , the first terminal 101 does not receive HARQ information on the PSFCH occasion corresponding to slot 3 , and does not use slot 5 to retransmit the PSSCH when waiting for the retransmission resource corresponding to slot 5 to arrive.

[0138] In some embodiments, if the first condition is met, the PSSCH is not retransmitted using the first resource.

[0139] The first terminal 101 does not use the first resource to retransmit the PSSCH on the selected first resource, but uses the retransmission resource whose time domain resource is located after receiving negative acknowledgment (Negative Acknowledgement, NACK) information to retransmit.

[0140] For example, FIG2C is a schematic diagram of other resource selection according to an embodiment of the present disclosure. As shown in FIG2C , the PSFCH occasion period is 4 time slots. When 1 PSSCH corresponds to 3 PSFCH occasions (i.e., the PSFCH occasion corresponding to slot 3, the PSFCH occasion corresponding to slot 7, and the PSFCH occasion corresponding to slot 11), assuming that the minimum time interval "a+b" is 5 slots, the corresponding retransmission resources selected are the retransmission resources corresponding to slot 5, the retransmission resources corresponding to slot 10, and the retransmission resources corresponding to slot 15.

[0141] Furthermore, based on FIG2C , it can be seen that the retransmission resource corresponding to slot 5 is located between the PSFCH occasion corresponding to slot 3 and the PSFCH occasion corresponding to slot 7. When the first terminal 101 does not receive HARQ information on the PSFCH occasion corresponding to slot 3, and when the retransmission resource corresponding to slot 5 is obtained, the first terminal 101 does not retransmit based on the retransmission resource corresponding to slot 5. It can be understood that slot 5 in this case can be understood as the first resource. The first terminal 101 will continue to monitor the second PSFCH occasion. When the first terminal 101 receives a NACK on the PSFCH occasion corresponding to slot 7, the first terminal 101 will not continue to monitor the PSFCH occasion corresponding to slot 11, and will report the NACK to the upper layer on the PSFCH occasion corresponding to slot 7, and the upper layer will perform retransmission.

[0142] Furthermore, when the retransmission resource located in slot 10 arrives, the upper layer will use the retransmission resource located in slot 10 to perform retransmission.

[0143] It should be noted that, for the relevant description of the PSFCH PRB, reference may be made to the relevant description in the embodiment of FIG2B , which will not be repeated here.

[0144] Step S2104: The first terminal 101 sends HARQ information based on executing the first behavior.

[0145] In some embodiments, the first terminal 101 sends HARQ to the second terminal 102 based on performing the first behavior.

[0146] In some embodiments, the second terminal 102 receives the HARQ signal sent based on performing the first behavior.

[0147] In some embodiments, the second terminal 102 is based on the HARQ sent by the first terminal 101 by performing the first behavior.

[0148] In some embodiments, the names of information, etc. are not limited to the names described in the embodiments, and terms such as "information", "message", "signal", "signaling", "report", "configuration", "indication", "instruction", "command", "channel", "parameter", "domain", "field", "symbol", "symbol", "codeword", "codebook", "codeword", "codepoint", "bit", "data", "program", and "chip" can be used interchangeably.

[0149] In some embodiments, the terms "PSSCH", "data", "TB transport block", "PSSCH data", etc. can be used interchangeably.

[0150] Exemplarily, retransmitting the PSSCH may refer to retransmitting data of the first terminal, or retransmitting the TB transmitted on the PSSCH.

[0151] In some embodiments, terms such as "uplink", "uplink", "physical uplink" can be interchangeable with each other, and terms such as "downlink", "downlink", "physical downlink" can be interchangeable with each other, and terms such as "side", "sidelink", "side communication", "sidelink communication", "direct connection", "direct link", "direct communication", "direct link communication" can be interchangeable with each other.

[0152] In some embodiments, terms such as "moment", "time point", "time", and "time position" can be replaced with each other, and terms such as "duration", "period", "time window", "window", and "time" can be replaced with each other.

[0153] In some embodiments, terms such as "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.

[0154] In some embodiments, terms such as "certain", "preset", "preset", "setting", "indicated", "a certain", "any", and "first" can be interchangeable. "Specific A", "preset A", "preset A", "setting A", "indicated A", "a certain A", "any A", and "first A" can be interpreted as A pre-specified in a protocol, etc., or as A obtained through setting, configuration, or indication, etc., or as specific A, a certain A, any A, or first A, etc., but not limited to this.

[0155] In some embodiments, the determination or judgment can be performed by a value represented by 1 bit (0 or 1), or by a true or false value (Boolean value) represented by true or false, or by comparison of numerical values ​​(for example, comparison with a predetermined value), but is not limited thereto.

[0156] 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 recipient to respond to the content sent.

[0157] The communication method involved in the embodiments of the present disclosure may include at least one of steps S2101 to S2104. The communication method involved in the embodiments of the present disclosure may include at least one of steps S2101 to S2104. For example, step S2102 can be implemented as an independent embodiment, step S2103 can be implemented as an independent embodiment, step S2102 + step S2103 can be implemented as independent embodiments, and steps S2101 + step S2102 + step S2103 can be implemented as independent embodiments, but are not limited thereto.

[0158] In some embodiments, steps S2102 and S2103 may be executed in an interchanged order or simultaneously.

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

[0160] In some embodiments, steps S2101 , S2102 , and S2104 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0161] In some embodiments, steps S2101, S2102, and S2103 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0162] In some embodiments, reference may be made to other optional implementations described before or after the description corresponding to FIG. 2A , FIG. 2B , and FIG. 2C .

[0163] FIG3A is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG3A , the embodiment of the present disclosure relates to a communication method, which includes:

[0164] Step S3101: Send PSSCH.

[0165] In some embodiments, the optional implementation of step S3101 can refer to the optional implementation of step S2101 in Figure 2A and other related parts of the embodiments involved in Figures 2A, 2B and 2C, which will not be repeated here.

[0166] Step S3102: Select the first resource.

[0167] The optional implementation of step S3102 can refer to the optional implementation of step S2102 in Figure 2A and other related parts in the embodiments involved in Figures 2A, 2B and 2C, which will not be repeated here.

[0168] Step S3103: According to the first resource selected by the first terminal, determine whether to use the first resource to retransmit the PSSCH.

[0169] The optional implementation of step S3103 can refer to the optional implementation of step S2103 in Figure 2A and other related parts in the embodiments involved in Figures 2A, 2B and 2C, which will not be repeated here.

[0170] Step S3104: Send HARQ information based on executing the first behavior.

[0171] The optional implementation of step S3104 can refer to the optional implementation of step S2104 in Figure 2A and other related parts in the embodiments involved in Figures 2A, 2B and 2C, which will not be repeated here.

[0172] The communication method involved in the embodiments of the present disclosure may include at least one of steps S3101 to S3104. For example, step S3102 can be implemented as an independent embodiment, step S3103 can be implemented as an independent embodiment, steps S3101+S3102 can be implemented as an independent embodiment, steps S3101+S3103 can be implemented as an independent embodiment, steps S3102+S3103 can be implemented as an independent embodiment, and steps S3101+S3102+S3103+S3104 can be implemented as independent embodiments, but the present invention is not limited thereto.

[0173] In some embodiments, steps S3102 and S3103 may be executed in an exchanged order or simultaneously. Steps S3102 and S3103 may be executed in an exchanged order or simultaneously.

[0174] In some embodiments, steps S3101, S3103, and S3104 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0175] In some embodiments, steps S3101, S3102, and S3104 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0176] In some embodiments, steps S3101, S3102, and S3103 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0177] FIG3B is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG3B , the embodiment of the present disclosure relates to a communication method, and the method includes:

[0178] Step S3201: Send PSSCH.

[0179] The optional implementation of step S3201 can be found in step S2101 of Figure 2A, the optional implementation of step S3101 of Figure 3A, and other related parts in the embodiments involved in Figures 2A, 2B, 2C, and 3A, which will not be repeated here.

[0180] Step S3202: Select the first resource.

[0181] The optional implementation of step S3202 can be found in step S2102 of FIG. 2A , the optional implementation of step S3102 of FIG. 3A , and other related parts in the embodiments involved in FIG. 2A , FIG. 2B , FIG. 2C , and FIG. 3A , which will not be repeated here.

[0182] Step S3203: According to the first resource selected by the first terminal, determine whether to use the first resource to retransmit the PSSCH.

[0183] The optional implementation of step S3203 can be found in steps S2103 and S2104 of Figure 2A, the optional implementation of step S3103 of Figure 3A, and other related parts in the embodiments involved in Figures 2A, 2B, 2C, and 3A, which will not be repeated here.

[0184] In the embodiment of the present disclosure, step S3201 can be combined with steps S3102-S3103 of FIG. 3A , and step S3202 can be combined with steps S3101 and S3103 of FIG. 3A .

[0185] FIG3C is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG3C , the embodiment of the present disclosure relates to a communication method, which includes:

[0186] Step S3301: Send PSSCH.

[0187] The optional implementation of step S3301 can be found in the optional implementation of step S2101 in Figure 2A, step S3101 in Figure 3A, step S3201 in Figure 3B, and other related parts in the embodiments involved in Figures 2A, 2B, 2C, 3A, and 3B, which will not be repeated here.

[0188] Step S3302: According to the first resource selected by the first terminal, determine whether to use the first resource to retransmit the PSSCH.

[0189] For the optional implementation of step S3302, please refer to step S2102, step S2103, step S2104 in Figure 2A, step S3102, step S3103, step S3104 in Figure 3A, and the optional implementation of step S3202, step S3203 in Figure 3B, as well as other related parts in the embodiments involved in Figures 2A, 2B, 2C, 3A, and 3B, which will not be repeated here.

[0190] In some embodiments, the first terminal sends a physical direct link shared channel PSSCH to the second terminal, where 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 behavior on a selected first resource; wherein the first behavior is whether to use the first resource to retransmit the PSSCH; wherein the first resource is used for retransmission of the PSSCH.

[0191] In some embodiments, the terminal determines that at least one of the following is satisfied: a first resource exists between the Xth PSFCH opportunity and the X+1th PSFCH opportunity; and hybrid automatic repeat request HARQ information of the PSSCH transmission result sent by the second terminal is not received from the 1st PSFCH opportunity to the Xth PSFCH opportunity, where X is an integer greater than or equal to 1 and less than N.

[0192] In some embodiments, the first behavior is an behavior of retransmitting the PSSCH using the first resource.

[0193] In some embodiments, the first behavior is not using the first resource for PSSCH retransmission.

[0194] In some embodiments, when a first condition is met, the first resource is not used to retransmit the PSSCH; the first condition includes that the value of X is less than a threshold.

[0195] In some embodiments, the threshold is determined in at least one of the following ways: based on pre-configuration information of a resource pool; based on pre-configuration information of a resource set RB set; based on pre-configuration information of a bandwidth part BWP; or based on a predefined rule.

[0196] In some embodiments, the method further includes: when the first condition is not met, retransmitting the PSSCH using the first resource.

[0197] In some embodiments, the time interval between any two resources selected by the terminal for a transport block TB transmitted on the PSSCH is greater than or equal to a minimum time interval.

[0198] In some embodiments, the time interval between the initial transmission resource and the retransmission resource of the 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.

[0199] In some embodiments, the minimum time interval is determined based on the first PSFCH opportunity corresponding to the PSSCH.

[0200] FIG4A is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG4A , the embodiment of the present disclosure relates to a communication method, and the method includes:

[0201] Step S4101, receive PSSCH.

[0202] The optional implementation methods of step S4101 can be found in the optional implementation methods of step S2101 in Figure 2A, step S3101 in Figure 3A, step S3201 in Figure 3B, step S3301 in Figure 3C, and other related parts in the embodiments involved in Figures 2A, 2B, 2C, 3A, 3B and 3C, which will not be repeated here.

[0203] In step S4102, the receiving terminal 101 determines whether to use the first resource to retransmit the PSSCH.

[0204] The optional implementation of step S4102 can be found in the optional implementation of step S2104 in Figure 2A, step S3104 in Figure 3A, step S3203 in Figure 3B, step S3302 in Figure 3C, and other related parts in the embodiments involved in Figures 2A, 2B, 2C, 3A, 3B and 3C, which will not be repeated here.

[0205] The communication method involved in the embodiments of the present disclosure may include at least one of steps S4101 and S4102. For example, step S4102 may be implemented as an independent embodiment, step S4101 may be implemented as an independent embodiment, and steps S4101+S4102 may be implemented as independent embodiments, but are not limited thereto.

[0206] In some embodiments, steps S4102 and S4101 may be executed in an interchanged order or simultaneously.

[0207] In some embodiments, step S4101 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0208] In some embodiments, step S4102 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0209] In the embodiment of the present disclosure, step S4101 can be combined with steps S3102-S3103 of FIG. 3A , and step S4102 can be combined with steps S3101 and S3103 of FIG. 3A .

[0210] FIG4B is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG4B , the embodiment of the present disclosure relates to a communication method, and the method includes:

[0211] Step S4201, receive PSSCH.

[0212] For the optional implementation of step S4201, please refer to the optional implementation of step S2101 in Figure 2A, step S3101 in Figure 3A, step S3201 in Figure 3B, step S3301 in Figure 3C, step S4101 in Figure 4A, and other related parts in the embodiments involved in Figures 2A, 2B, 2C, 3A, 3B, 3C and 4A, which will not be repeated here.

[0213] In some embodiments, the second terminal receives a 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 behavior; wherein the first behavior is whether to use a first resource to retransmit the PSSCH; wherein the first resource is used for the PSSCH retransmission; the PSSCH corresponds to N physical direct link feedback channel PSFCH opportunities, and N is an integer greater than or equal to 1.

[0214] In some embodiments, there is a first resource between the Xth PSFCH opportunity and the X+1th PSFCH opportunity; the method also includes: the second terminal performs channel monitoring on N physical direct link feedback channel PSFCH occasions corresponding to the PSSCH; sends hybrid automatic repeat request HARQ information for the PSSCH transmission result on the earliest PSFCH occasion where the channel monitoring is successful; wherein, from the 1st PSFCH opportunity to the Xth PSFCH opportunity, 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.

[0215] In some embodiments, the first behavior is an behavior of retransmitting the PSSCH using the first resource.

[0216] In some embodiments, the first behavior is not using the first resource for PSSCH retransmission.

[0217] In some embodiments, when a first condition is met, the first resource is not used to receive the PSSCH retransmitted by the first terminal; the first condition includes that the value of X is less than a threshold.

[0218] In some embodiments, the threshold is determined in at least one of the following ways: based on pre-configuration information of a resource pool; based on pre-configuration information of a resource set RB set; based on pre-configuration information of a bandwidth part BWP; or based on a predefined rule.

[0219] In some embodiments, when the first condition is not met, the PSSCH retransmitted by the first terminal is received using the first resource.

[0220] 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.

[0221] In some embodiments, the time interval between the initial transmission resource and the retransmission resource of the 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.

[0222] In some embodiments, the minimum time interval is determined based on the first PSFCH opportunity corresponding to the PSSCH.

[0223] In one implementation, 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 where the PSSCH is located and the first symbol of the first PSFCH occasion corresponding to the PSSCH.

[0224] In some embodiments, when a TB supports retransmission based on HARQ feedback, the minimum time interval a+b must be met between any two resources selected for the TB, where a and b are the values ​​of a, i.e., a is the time interval between the last symbol of the PSSCH and the first symbol of the first PSfch occasion corresponding to the PSSCH, and b is the time required for PSFCH reception and processing and sidelink 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.

[0225] Figure 5 is an interactive diagram of a communication method according to an embodiment of the present disclosure. As shown in Figure 5, the embodiment of the present disclosure relates to a communication method, which includes:

[0226] Step S5101: The first terminal 101 sends a PSSCH to the second terminal 102.

[0227] In some embodiments, the second terminal 102 receives the PSSCH.

[0228] In some embodiments, the PSSCH corresponds to N physical direct link feedback channel PSFCH opportunities, where N is an integer greater than or equal to 1.

[0229] For the optional implementation of step S5101, please refer to step S2101 in Figure 2A, step S3101 in Figure 3A, step S3201 in Figure 3B, step S3301 in Figure 3C, step S4101 in Figure 4A, step S4201 in Figure 4B, and other related parts in the embodiments involved in Figures 2A, 2B, 2C, 3A, 3B, 3C, 4A and 4B, which will not be repeated here.

[0230] 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.

[0231] In some embodiments, the first terminal 101 performs a first behavior on the selected first resource.

[0232] In some embodiments, the first behavior is whether to use the first resource to retransmit the PSSCH.

[0233] In some embodiments, the first resource is used for said PSSCH retransmission.

[0234] For the optional implementation of step S5101, please refer to steps S2102 to S2104 of Figure 2A, steps S3102 to S3014 of Figure 3A, steps S3202 to S3203 of Figure 3B, and the optional implementation of step S3302 of Figure 3C, as well as other related parts in the embodiments involved in Figures 2A, 2B, 2C, 3A, 3B, and 3C, which will not be repeated here.

[0235] The present disclosure also provides a communication method, as described below:

[0236] In some embodiments, when a TB supports retransmission based on HARQ feedback, the minimum time interval a+b must be met between any two resources selected for the TB, where a and b are the values ​​of a, i.e., a is the time interval between the last symbol of the PSSCH and the first symbol of the first PSfch occasion corresponding to the PSSCH, and b is the time required for PSFCH reception and processing and sidelink 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.

[0237] In some embodiments, when the retransmission resource selected by the UE is located between the xth PSFCH occasion and the x+1th (1≤X<N)th PSFCH occasion, and no HARQ information is received on the xth PSFCH occasion and the PSFCH occasion before the xth PSFCH occasion, there are the following two solutions for the retransmission resource between the xth PSFCH occasion and the x+1th (1≤X<N)th PSFCH occasion:

[0238] -A) The UE may perform retransmission using retransmission resources whose time domain resources are between the xth to x+1th PSFCH occasions.

[0239] -B) The UE skips (ie, does not use) the retransmission resources between the xth and x+1th PSFCH occasions. The UE only uses the retransmission resources whose time domain resources are located after the physical layer reports NACK to the higher layer.

[0240] Exemplarily, for -A), continuing with the embodiment of FIG2B , the PSFCH occasion period 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, the selected retransmission resources are located in slot 5, slot 10, and slot 15. The retransmission resource of 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 (slot 3), then when the retransmission resource of slot 5 arrives, the UE can use the retransmission resource located in slot 5 to perform retransmission.

[0241] Exemplarily, for -B), continuing with the embodiment of FIG2C , the period of the PSFCH occasion is 4 slots. When 1 PSSCH corresponds to 3 PSFCH occasions, the PSSCH in slot 0 corresponds to 3 PSFCH occasions, which are located in slot 3, slot 7, and slot 11 respectively. Assume that a+b=5 slots, and the selected retransmission resources are located in slot 5, slot 10, and slot 15. The retransmission resource of slot 5 is located between the first PSFCH occasion and the second PSFCH occasion. The UE does not receive any HARQ information on the first PSFCH occasion in slot 3. Then, after the retransmission resource of slot 5 arrives, the UE does not use the retransmission resource in slot 5 to perform retransmission. The UE will continue to monitor the second PSFCH occasion. The UE receives NACK on the second PSFCH occasion. The UE will not continue to monitor the third PSFCH occasion, and will report NACK to the upper layer in the second PSFCH occasion in slot 7. The upper layer will perform retransmission. When the retransmission resource in slot 10 arrives, the upper layer will use the retransmission resource in slot 10 to perform retransmission.

[0242] Furthermore, PSFCH prb set1 is the PRB set associated with the first PSFCH occasion located in slot 3, that is, the frequency domain resources of the first PSFCH occasion are determined in this PRB set, PSFCH prb set2 is the PRB set associated with the second PSFCH occasion located in slot 7, that is, the frequency domain resources of the second PSFCH occasion are determined in this PRB set, and PSFCH prb set3 is the PRB set associated with the third PSFCH occasion located in slot 11, that is, the frequency domain resources of the third PSFCH occasion are determined in this PRB set.

[0243] In some embodiments, the condition for the UE to skip the retransmission resource includes at least one of the following:

[0244] -a) No HARQ information is received on the xth PSFCH occasion and the PSFCH occasion before the xth PSFCH occasion.

[0245] -b) When the value of x is less than or equal to the threshold, use option 2, otherwise use -A).

[0246] In some embodiments, the threshold is based on a resource pool, BWP, pre-configured or pre-defined.

[0247] Through the embodiments of the present disclosure, when the minimum interval a+b that needs to be satisfied for resource selection is executed for 1 TB, the terminal behavior is specified, thereby avoiding performance impact due to unclear terminal behavior.

[0248] In the embodiments of the present disclosure, 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 of other embodiments.

[0249] The embodiments of the present disclosure further provide an apparatus for implementing any of the above methods. For example, an apparatus is provided, comprising units or modules for implementing each step performed by a terminal in any of the above methods. For another example, another apparatus is provided, comprising units or modules for implementing each step performed by a network device (e.g., an access network device, a core network function node, a core network device, etc.) in any of the above methods.

[0250] It should be understood that the division of the various units or modules in the above device is merely a division of logical functions. In actual implementation, they may be fully or partially integrated into a physical entity, or they may be physically separated. In addition, the units or modules in the device may be implemented in the form of a processor calling software: for example, the device includes a processor, the processor is connected to a memory, and the memory stores instructions. The processor calls the instructions stored in the memory to implement any of the above methods or implement the functions of the various units or modules of the above device, wherein the processor is, for example, a general-purpose processor, such as a central processing unit (CPU) or a microprocessor, and the memory is a memory within the device or a memory outside the device. Alternatively, the units or modules in the device can be implemented in the form of hardware circuits, and the functions of some or all of the units or modules can be realized by designing the hardware circuits. The above-mentioned hardware circuits can be understood as one or more processors; for example, in one implementation, the above-mentioned hardware circuit is an application-specific integrated circuit (ASIC), which realizes the functions of some or all of the above units or modules by designing the logical relationship of the components in the circuit; for example, in another implementation, the above-mentioned hardware circuit can be realized by a programmable logic device (PLD). Taking a field programmable gate array (FPGA) as an example, it can include a large number of logic gate circuits, and the connection relationship between the logic gate circuits is configured by configuring the configuration file, thereby realizing the functions of some or all of the above units or modules. All units or modules of the above devices can be realized in the form of software called by the processor, or in the form of hardware circuits, or in part by the form of software called by the processor, and the rest by hardware circuits.

[0251] In the embodiments of the present disclosure, the processor is a circuit with signal processing capabilities. In one implementation, the processor can be a circuit with instruction reading and execution capabilities, such as a central processing unit (CPU), a microprocessor, a graphics processing unit (GPU) (which can be understood as a microprocessor), or a digital signal processor (DSP). In another implementation, the processor can implement certain functions through the logical relationship of the hardware circuit. The logical relationship of the above-mentioned hardware circuit is fixed or reconfigurable. For example, the processor is a hardware circuit implemented by an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as an FPGA. In a reconfigurable hardware circuit, the process of the processor loading a configuration document and implementing the hardware circuit configuration can be understood as the process of the processor loading instructions to implement the functions of some or all of the above units or modules. In addition, it can also be a hardware circuit designed for artificial intelligence, which can be understood as an ASIC, such as a neural network processing unit (NPU), a tensor processing unit (TPU), a deep learning processing unit (DPU), etc.

[0252] Figure 6A is a schematic diagram of the structure of the first terminal proposed in an embodiment of the present disclosure. As shown in Figure 6A, 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 by the first terminal 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, where N is an integer greater than or equal to 1; the first terminal performs a first behavior on the selected first resource; wherein the first behavior is whether to use the first resource to retransmit the PSSCH; wherein the first resource is used for the PSSCH retransmission. Optionally, the transceiver module is used to perform at least one of the communication steps such as sending and / or receiving performed by the first terminal 101 in any of the above methods (for example, step S2101, step S2104, but not limited thereto), which will not be repeated here. Optionally, the above-mentioned processing module is used to execute at least one of the other steps (such as step S2102 and step S2103, but not limited thereto) performed by the first terminal 101 in any of the above methods, which will not be repeated here.

[0253] Figure 6B is a schematic diagram of the structure of the second terminal proposed in an embodiment of the present disclosure. As shown in Figure 6B, the second terminal 6200 may include: a transceiver module 6201. In some embodiments, the above-mentioned 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 the first behavior; wherein the first behavior is whether to use the first resource to retransmit the PSSCH; wherein the first resource is used for the PSSCH retransmission; PSSCH corresponds to N physical direct link feedback channel PSFCH opportunities, and N is an integer greater than or equal to 1. Optionally, the above-mentioned transceiver module is used to perform at least one of the communication steps such as sending and / or receiving performed by the second terminal 102 in any of the above methods (such as step S2104, but not limited to this), which will not be repeated here.

[0254] In some embodiments, the transceiver module may include a transmitting module and / or a receiving module, and the transmitting module and the receiving module may be separate or integrated. Optionally, the transceiver module may be interchangeable with the transceiver.

[0255] In some embodiments, the processing module can be a single module or include multiple submodules. Optionally, the multiple submodules each execute all or part of the steps required to be executed by the processing module. Optionally, the processing module and the processor can be interchangeable.

[0256] Figure 7A is a schematic diagram of the structure of a communication device 7100 proposed in an embodiment of the present disclosure. Communication device 7100 can be a network device (e.g., an access network device, a core network device, etc.), a terminal (e.g., a user equipment, etc.), a chip, a chip system, or a processor that supports a network device to implement any of the above methods, or a chip, a chip system, or a processor that supports a terminal to implement any of the above methods. Communication device 7100 can be used to implement the methods described in the above method embodiments. For details, please refer to the description of the above method embodiments.

[0257] As shown in Figure 7A, the communication device 7100 includes one or more processors 7101. The processor 7101 can be a general-purpose processor or a dedicated processor, for example, a baseband processor or a central processing unit. The baseband processor can be used to process the communication protocol and communication data, and the central processing unit can be used to control the communication device (such as a base station, a baseband chip, a terminal device, a terminal device chip, a DU or a CU, etc.), execute programs, and process program data. Optionally, the communication device 7100 is used to perform any of the above methods. Optionally, one or more processors 7101 are used to call instructions to enable the communication device 7100 to perform any of the above methods.

[0258] 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 such as sending and / or receiving in the above method (for example, step S2102 and step S2103, but not limited thereto), and the processor 7101 performs at least one of the other steps (for example, step S2101, but not limited thereto). In an optional embodiment, the transceiver may include a receiver and / or a transmitter, and the receiver and transmitter may be separate or integrated. Optionally, the terms transceiver, transceiver unit, transceiver, transceiver circuit, interface circuit, and interface may be interchangeable, the terms transmitter, transmitting unit, transmitter, and transmitting circuit may be interchangeable, and the terms receiver, receiving unit, receiver, and receiving circuit may be interchangeable.

[0259] In some embodiments, the communication device 7100 further includes one or more memories 7103 for storing data. Alternatively, all or part of the memories 7103 may be located outside the communication device 7100. In alternative 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 may be configured to receive data from the memories 7103 or other devices, or to send data to the memories 7103 or other devices. For example, the interface circuits 7104 may read data stored in the memories 7103 and send the data to the processor 7101.

[0260] 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 the present disclosure is not limited thereto, and the structure of the communication device 7100 may not be limited to FIG. 7A. The communication device may be an independent device or may be part of a larger device. For example, the communication device may be: 1) an independent integrated circuit IC, or a chip, or a chip system or subsystem; (2) a collection of one or more ICs, optionally, the above IC collection may also include a storage component for storing data or programs; (3) an ASIC, such as a modem; (4) a module that can be embedded in other devices; (5) a receiver, a terminal device, an intelligent terminal device, a cellular phone, a wireless device, a handheld device, a mobile unit, an in-vehicle device, a network device, a cloud device, an artificial intelligence device, etc.; (6) others, etc.

[0261] 7B is a schematic diagram of the structure of a chip 7200 proposed in an embodiment of the present disclosure. If the communication device 7100 can be a chip or a chip system, please refer to the schematic diagram of the structure of the chip 7200 shown in FIG7B , but the present disclosure is not limited thereto.

[0262] The chip 7200 includes one or more processors 7201. The chip 7200 is configured to execute any of the above methods.

[0263] In some embodiments, chip 7200 further includes one or more interface circuits 7202. Alternatively, terms such as interface circuit, interface, and transceiver pins may be used interchangeably. In some embodiments, chip 7200 further includes one or more memories 7203 for storing data. Alternatively, all or part of memory 7203 may be located external to chip 7200. Optionally, interface circuit 7202 is connected to memory 7203 and may be used to receive data from memory 7203 or other devices, or may be used to send data to memory 7203 or other devices. For example, interface circuit 7202 may read data stored in memory 7203 and send the data to processor 7201.

[0264] In some embodiments, the interface circuit 7202 performs at least one of the communication steps (e.g., step S2102 and step S2103, but not limited thereto) of the aforementioned method. The interface circuit 7202 performing the communication steps (e.g., step S2102 and step S2103, but not limited thereto) of the aforementioned method means, for example, that the interface circuit 7202 performs data exchange between the processor 7201, chip 7200, memory 7203, or a transceiver device. In some embodiments, the processor 7201 performs at least one of the other steps (e.g., step S2101, but not limited thereto).

[0265] The modules and / or devices described in various embodiments, such as virtual devices, physical devices, and chips, can be arbitrarily combined or separated according to circumstances. Optionally, some or all steps can also be performed collaboratively by multiple modules and / or devices, which is not limited here.

[0266] The present disclosure also proposes a storage medium having instructions stored thereon. When the instructions are executed on the communication device 7100, the communication device 7100 executes any of the above methods. Optionally, the storage medium is an electronic storage medium. Optionally, the storage medium is a computer-readable storage medium, but is not limited thereto and may also be a storage medium readable by other devices. Optionally, the storage medium may be a non-transitory storage medium, but is not limited thereto and may also be a temporary storage medium.

[0267] The present disclosure also provides a program product, which, when executed by the communication device 7100, enables the communication device 7100 to perform any of the above methods. Optionally, the program product is a computer program product.

[0268] The present disclosure also proposes a computer program, which, when executed on a computer, causes the computer to perform any one of the above methods.

Claims

1. A communication method, characterized in that: The method comprises: The first terminal sends a physical direct link shared channel PSSCH to the second terminal, where the PSSCH corresponds to N physical direct link feedback channel PSFCH opportunities, where N is an integer greater than or equal to 1; Determine, according to a first resource selected by the first terminal, whether to use the first resource to retransmit the PSSCH; The first resource is used for the PSSCH retransmission.

2. The method according to claim 1, characterized in that The method further comprises: The first terminal determines that at least one of the following is satisfied: There is a first resource between the Xth PSFCH opportunity and the X+1th PSFCH opportunity; During the 1st PSFCH opportunity to the Xth PSFCH opportunity, no hybrid automatic repeat request HARQ information of the PSSCH transmission result sent by the second terminal is received, wherein X is an integer greater than or equal to 1 and less than N.

3. The method according to claim 1 or 2, characterized in that: When a first condition is met, the first resource is not used to retransmit the PSSCH; The first condition includes that the value of X is less than a threshold.

4. The method according to claim 3, characterized in that The threshold is determined by at least one of the following methods: Determined based on pre-configured information of the resource pool; Determined based on pre-configured information of a resource set RB set; Determined based on pre-configured information of the bandwidth part BWP; Determined based on predefined rules.

5. The method according to claim 3, characterized in that: The method further comprises: When the first condition is not met, the first resource is used to retransmit the PSSCH.

6. The method according to any one of claims 1 to 5, 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.

7. The method according to claim 6, characterized in that The minimum time interval is determined based on a first PSFCH opportunity corresponding to the PSSCH.

8. A communication method, characterized in that: The method comprises: The second terminal receives a physical direct link shared channel PSSCH sent by the first terminal; The second terminal receives the PSSCH in which the first terminal determines whether to use the first resource to retransmit the PSSCH; Wherein, the first resource is used for the 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.

9. The method according to claim 8, characterized in that The first resource exists between the Xth PSFCH opportunity and the X+1th PSFCH opportunity; The method further comprises: The second terminal performs channel monitoring at the timing of N physical direct link feedback channels PSFCH corresponding to the PSSCH; Sending hybrid automatic repeat request HARQ information for the PSSCH transmission result on the earliest PSFCH occasion where the channel is successfully sensed; Wherein, at the 1st PSFCH opportunity to the Xth PSFCH opportunity, 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.

10. The method according to claim 8 or 9, characterized in that: When a first condition is met, the first resource is not used to receive the PSSCH retransmitted by the first terminal; The first condition includes that the value of X is less than a threshold.

11. The method according to claim 10, characterized in that The threshold is determined by at least one of the following methods: Determined based on pre-configured information of the resource pool; Determined based on pre-configured information of resource set RB set Determined based on pre-configured information of the bandwidth part BWP; Determined based on predefined rules.

12. The method according to claim 10, characterized in that The method further comprises: When the first condition is not met, the PSSCH retransmitted by the first terminal is received using the first resource.

13. The method according to any one of claims 8 to 12, 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.

14. The method according to claim 13, characterized in that The minimum time interval is determined based on a first PSFCH opportunity corresponding to the PSSCH.

15. A first terminal, characterized in that: include: A transceiver module sends a physical direct link shared channel PSSCH to the second terminal, where the PSSCH corresponds to N physical direct link feedback channel PSFCH opportunities, where N is an integer greater than or equal to 1; a processing module, 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 the PSSCH retransmission.

16. A second terminal, characterized in that: include: A transceiver module, configured to receive a physical direct link shared channel PSSCH sent by a first terminal, and receive the PSSCH in which the first terminal determines whether to use a first resource to retransmit the PSSCH; Wherein, the first resource is used for the 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.

17. A terminal, characterized in that: include: one or more processors; The processor is used to execute the communication method described in any one of claims 1 to 7 or 8 to 14.

18. A communication system, characterized in that: The invention comprises a first terminal and a second terminal, wherein the first terminal is configured to implement the communication method according to any one of claims 1 to 7, and the second terminal is configured to implement the communication method according to any one of claims 8 to 14.

19. A storage medium storing instructions, characterized in that: When the instruction is executed on a communication device, the communication device is caused to execute the communication method according to any one of claims 1 to 7 or 8 to 14.

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