Communication method and device

Abstract

The present application relates to a communication method and device. The first terminal device sends a first SCI at N first times, the first SCI is used to indicate first configuration information, the first configuration information includes resources for a first periodic transmission, the first periodic transmission includes M transmissions, the transmission period of the first periodic transmission is the first period, the M transmissions include P transmission times, N is an integer greater than or equal to 1, M is an integer less than or equal to P, and P is an integer greater than N. The first terminal device sends a second SCI associated with the first SCI at N second times. The first terminal device does not need to send SCI for each transmission block of the first periodic transmission service, which reduces the number of times the second terminal device monitors the control channel and decodes the SCI, thereby reducing the power consumption of the second terminal device. Moreover, since the number of SCIs sent by the first terminal device is reduced, the transmission overhead can also be reduced.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on June 21, 2021, with application number 202110685208.1 and application name “A communication method, terminal and network device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of communication technology, and in particular to a communication method and device. Background Art

[0004] There are two resource allocation modes in the sidelink (SL) communication process: one is the network control mode, that is, the SL communication resources are scheduled by the network equipment; the other is the distributed mode, that is, the user equipment (UE) independently selects the SL communication resources from the pre-configured SL resource pool. In the distributed mode, when the transmitting UE (TX UE) needs to send data to the receiving UE (RX UE), the TX UE can select the SL communication resources for transmission from the SL resource pool based on the resource sensing process. Specifically, in the resource sensing process, the TX UE needs to blindly detect the physical sidelink control channel (PSCCH) of other TX UEs within the resource sensing window to select SL communication resources that are not used by other TX UEs for transmission. On the other hand, for the RX UE, it is necessary to blindly detect the PSCCH of other UEs in the SL resource pool to determine whether there is data to be sent to the RX UE. Moreover, the TX UE may also be an RX UE for other UEs, so the TX UE also needs to blindly detect the PSCCH of other UEs in the SL resource pool to determine whether there is data sent to the TX UE.

[0005] In the existing SL communication mechanism, the TX UE needs to send sidelink control information (SCI) for each physical sidelink shared channel (PSSCH). On the one hand, SCI is used by other UEs to avoid interference when selecting resources, and on the other hand, it is used by the RX UE to receive data (the RX UE needs to decode the SCI associated with each PSSCH). However, for periodic services, if the parameters such as the period of data packet transmission and the size of the data packet of the TX UE are relatively fixed, most of the information included in the SCI associated with multiple PSSCHs remains basically unchanged. In this case, the RX UE decodes the SCI associated with each PSSCH, and the information obtained is relatively similar. It can be considered that the RX UE performs multiple redundant decoding processes, and the decoding process will also generate higher power consumption. Summary of the Invention

[0006] The embodiments of the present application provide a communication method and device for reducing the power consumption of a UE due to decoding SCI.

[0007] In a first aspect, a communication method is provided, which can be executed by a terminal device, or by a larger device including the terminal device, or by a chip system or other functional module, which can implement the functions of the terminal device. The terminal device is, for example, referred to as a first terminal device. The method includes: sending a first SCI at N first times, the first SCI is used to indicate first configuration information, the first configuration information indicates resources for a first periodic transmission, the resources for the first periodic transmission include time domain resources and / or frequency domain resources, the first periodic transmission includes M transmissions, the transmission period of the first periodic transmission is a first period, the M transmissions correspond to P transmission times, where N is an integer greater than or equal to 1, M is an integer less than or equal to P, and P is an integer greater than N; sending a second SCI associated with the first SCI at N second times, the first SCI sent at the N first times and the second SCI sent at the N second times are used to schedule the M transmissions.

[0008] In an embodiment of the present application, for example, a first periodic service (or, referred to as a first periodic transmission) includes M transmissions, for example, the M transmissions may correspond to P second times, and the second time may be used to send a second SCI. The first terminal device may send the second SCI at N second times, without having to send the second SCI at all P second times. That is, the first terminal device does not need to send SCI (first SCI and / or second SCI) for all transmission blocks of the first periodic service. This reduces the number of times the second terminal device decodes the SCI, thereby reducing the power consumption of the second terminal device. Moreover, since the number of SCIs sent by the first terminal device is reduced, the transmission overhead can also be reduced.

[0009] In conjunction with the first aspect, in a first optional implementation of the first aspect, the i-th second time among the N second times is the time at which a transport block of the M transmissions is transmitted, where i is any integer from 0 to N-1; or, the i-th second time among the N second times is offset from the time at which the most recent transport block is transmitted, where i is any integer from 0 to N-1, the time at which the most recent transport block is transmitted is after the i-th second time, and the transport block belongs to one of the M transmissions. The second time refers to the time at which a second SCI is transmitted. If scheduling occurs within the same time-domain resource unit, the second time and the time at which the corresponding transport block is transmitted may be the same time; if scheduling occurs across time-domain resource units, the second time may be before the time at which the corresponding transport block is transmitted. In other words, the embodiments of the present application support both scheduling within the same time-domain resource unit and scheduling across time-domain resource units, providing a more flexible scheduling approach for periodic services. A time-domain resource unit may be, for example, a subframe, a time slot, a mini-time slot, or a symbol.

[0010] In combination with the first aspect or the first optional implementation of the first aspect, in the second optional implementation of the first aspect, the first time and the second time are the same; or, there is a second time offset between the i-th first time and the i-th second time, and the second time offset is indicated by the first SCI or is predefined or preconfigured. The first time is used to send the first SCI, and the second time is used to send the second SCI. The first time and the second time can be the same time, for example, the first SCI and the second SCI are sent in the same time slot, which can improve resource utilization and improve transmission efficiency. Alternatively, the first time and the second time can also be different times, for example, the first SCI and the second SCI are sent in different time slots. It can be seen that the transmission flexibility of SCI in the embodiment of the present application is relatively high.

[0011] In combination with the first aspect or the first optional implementation manner of the first aspect or the second optional implementation manner of the first aspect, in the third optional implementation manner of the first aspect, the method further includes: sending a third SCI at K first times, the K first times being associated with K transmission blocks in the M transmissions, the third SCI being used to indicate second configuration information, the K transmission blocks being transmission blocks other than N transmission blocks in the M transmissions, the j-th transmission block in the N transmission blocks being a transmission block occurring at the j-th second time in the N second times in the M transmissions, or a transmission block most recently after the j-th second time in the N second times. Optionally, the second configuration information is identical to all or part of the information included in the first configuration information indicated by the first SCI most recently sent before sending the third SCI, and K is a positive integer less than or equal to PN. Since the first SCI can indicate the resources of the first periodic transmission, in addition to the receiving end of the first periodic service (such as the second UE) being able to determine the resources of the first periodic transmission based on the first SCI, other terminal devices that receive the first SCI can also perform resource perception based on the first SCI, thereby avoiding occupying the time / frequency resources of the periodic transmission as much as possible to reduce collisions. To this end, optionally, in addition to sending the first SCI at N first times, the first terminal device can also send a third SCI at another K first times corresponding to M transmissions. The second configuration information indicated by the third SCI can be used for resource perception by other terminal devices, thereby reducing the probability of resource collisions. For the second terminal device, it is not necessary to detect the third SCI to save power consumption. In the subsequent introduction of this application, "detecting" SCI may also be referred to as "monitoring" SCI.

[0012] In conjunction with the third optional implementation of the first aspect, in a fourth optional implementation of the first aspect, the method further includes: not sending a second SCI associated with the third SCI. The second SCI is used for detection by the second terminal device, while the third SCI is primarily used by other terminal devices for resource perception and does not require detection by the second terminal device. Therefore, the first terminal device does not need to send the second SCI associated with the third SCI, thereby saving transmission overhead. For the second terminal device, not needing to detect the second SCI associated with the third SCI can also save power consumption.

[0013] In combination with any one of the first optional implementation manners of the first aspect to the fourth optional implementation manner of the first aspect, in the fifth optional implementation manner of the first aspect, the method further includes: not sending the second SCI at PN second times, the PN second times are associated with PN transmission blocks other than N transmission blocks in the M transmissions, and the j-th transmission block in the N transmission blocks is a transmission block occurring at the j-th second time in the N second times in the M transmissions, or a transmission block closest to the j-th second time in the N second times. The first terminal device does not send the second SCI at any of the PN second times, which can be understood as the first terminal device does not need to send the second SCI at each second time corresponding to the first periodic service, thereby reducing the number of second SCIs sent and saving transmission overhead. For the second terminal device, the second SCI may not be detected at the PN second times, thereby also reducing the power consumption of the second terminal device due to decoding the second SCI.

[0014] In combination with the fifth optional implementation of the first aspect, in the sixth optional implementation of the first aspect, the method further includes: sending the first transmission block of the periodic transmission on the first resource, the first transmission block is one of the PN transmission blocks, the first resource includes time domain resources and / or frequency domain resources, and the first resource is determined based on the first SCI most recently before the first resource. The first terminal device does not need to indicate the time / frequency resources every time it transmits a transmission block of the first periodic service, but only needs to indicate the resources at a moment associated with a part of the transmission time, which is equivalent to one SCI being able to schedule the transmission of multiple transmission blocks. The second terminal device can detect the transmission block at the subsequent transmission time based on the first configuration information indicated by the first SCI previously received. In this way, the second terminal device can detect the transmission block normally, and the number of first SCIs sent by the first terminal device can be reduced, thus saving transmission overhead, and also saving the power consumption caused by the second terminal device detecting and decoding the first SCI.

[0015] In conjunction with any one of the first optional implementation manners of the first aspect to the sixth optional implementation manner of the first aspect, in a seventh optional implementation manner of the first aspect, the first SCI is further used to indicate whether to send a second SCI associated with the first SCI. Whether the first terminal device sends the second SCI can be indicated by the first SCI. In this way, the second terminal device can determine whether to continue detecting the second SCI based on the indication of the first SCI, thereby reducing the power consumption of the second terminal device's blind detection.

[0016] In conjunction with any one of the first optional implementation manners of the first aspect to the seventh optional implementation manner of the first aspect, in the eighth optional implementation manner of the first aspect, the method further includes: sending third configuration information, the third configuration information being used to configure a second period, the second period being a period for the receiving end of the first periodic transmission to detect the first SCI, and the second period being greater than or equal to the first period. The timing at which the first terminal device sends the first SCI may not be exactly the same as the timing at which the second terminal device detects the first SCI. For example, the first terminal device may send the first SCI at both N first moments and K first moments (the third SCI may also be considered the first SCI, but is named differently to distinguish the SCIs sent at different moments), but the second terminal device may detect the first SCI at the N first moments, but may not detect the first SCI at all or part of the K first moments. To this end, a second period may also be configured, and the second period may be used for the receiving end of the first periodic transmission (e.g., the second terminal device) to detect the first SCI, so that the second terminal device can clearly determine the detection timing of the first SCI. For example, the duration of the second cycle may be greater than or equal to the duration of the first cycle. The second terminal device detects the first SCI according to the second cycle instead of the first cycle, which can reduce power consumption caused by detection.

[0017] In combination with any one of the first optional implementation manners to the eighth optional implementation manner of the first aspect, in the ninth optional implementation manner of the first aspect, the method further includes: sending fourth configuration information, wherein the fourth configuration information is used to indicate the number of transmission blocks included in each transmission of the first periodic transmission, and / or the resources of the first periodic transmission occupied by the transmission blocks included in each transmission. For some periodic services, the number of transmission blocks sent by the first terminal device in different first periods may not be exactly the same, or in other words, the first terminal device may use all or part of the time / frequency resources included in the first period for sending periodic services to send the transmission blocks of the periodic services. Then the first terminal device may send the fourth configuration information, and the second terminal device may detect the transmission blocks according to the instructions of the fourth configuration information, and may not perform detection on the time / frequency resources where the first terminal device does not send transmission blocks, thereby saving power consumption.

[0018] In a second aspect, another communication method is provided. The method can be executed by a terminal device, or by a larger device including the terminal device, or by a chip system or other functional module that can implement the functions of the terminal device. The terminal device is, for example, referred to as a second terminal device. The method includes: detecting first sidelink control information (SCI) at N first times, where the first SCI is used to indicate first configuration information, the first configuration information indicates resources for a first periodic transmission, the resources for the first periodic transmission include time domain resources and / or frequency domain resources, the first periodic transmission includes M transmissions, the transmission period of the first periodic transmission is a first period, the M transmissions correspond to P transmission times, where N is an integer greater than or equal to 1, M is an integer less than or equal to P, and P is an integer greater than N; and detecting a second SCI associated with the first SCI at N second times, where the first SCI sent at the N first times and the second SCI sent at the N second times are used to schedule the M transmissions.

[0019] Regarding the technical effects brought about by the second aspect or various optional implementations, reference may be made to the introduction to the technical effects of the first aspect or corresponding implementations.

[0020] In a third aspect, a communication device is provided. The communication device may be the terminal device (the first terminal device or the second terminal device) described in any one of the first to second aspects. The communication device has the functions of the terminal device. The communication device may be, for example, a terminal device, or a functional module in the terminal device, such as a baseband device or a chip system. In one optional implementation, the communication device includes a baseband device and a radio frequency device. In another optional implementation, the communication device includes a processing unit (sometimes also referred to as a processing module) and a transceiver unit (sometimes also referred to as a transceiver module). The transceiver unit is capable of performing both transmitting and receiving functions. When the transceiver unit performs the transmitting function, it may be referred to as a transmitting unit (sometimes also referred to as a transmitting module); when the transceiver unit performs the receiving function, it may be referred to as a receiving unit (sometimes also referred to as a receiving module). The transmitting unit and the receiving unit may be the same functional module, referred to as a transceiver unit, which is capable of both transmitting and receiving functions; alternatively, the transmitting unit and the receiving unit may be different functional modules, with the transceiver unit being a general term for these functional modules.

[0021] In an optional implementation, the communication device also includes a storage unit, and the processing unit is used to couple with the storage unit and execute the program or instructions in the storage unit, so as to enable the communication device to perform the functions of the terminal device (first terminal device and / or second terminal device) described in any one of the first to second aspects above.

[0022] In a fourth aspect, a computer-readable storage medium is provided, which is used to store computer programs or instructions. When the computer-readable storage medium is executed, the method performed by the first terminal device and / or the second terminal device in the above aspects is implemented.

[0023] According to a fifth aspect, a computer program product comprising instructions is provided, which, when executed on a computer, enables the methods described in the above aspects to be implemented.

[0024] In a sixth aspect, a device is provided, comprising a unit for executing the method described in any embodiment of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the transmission method of SCI 1 and SCI 2;

[0026] Figure 2 Schematic diagram of resource selection for TX UE;

[0027] Figure 3A and Figure 3B Schematic diagrams of two application scenarios of the embodiments of the present application;

[0028] Figure 4 A flow chart of a communication method provided in an embodiment of the present application;

[0029] Figure 5A and Figure 5B Two examples of various times in the embodiments of this application;

[0030] Figure 6A 、 Figure 6B 、 Figure 7 as well as Figure 8 Schematic diagram of several working modes provided by the communication method of the embodiment of the present application;

[0031] Figure 9 A schematic block diagram of a communication device provided in an embodiment of the present application;

[0032] Figure 10 A schematic block diagram of a terminal device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0034] Below, some terms or concepts in the embodiments of the present application are explained to facilitate understanding by those skilled in the art.

[0035] In the embodiment of the present application, the terminal device is a device with wireless transceiver function, which can be a fixed device, a mobile device, a handheld device (such as a mobile phone), a wearable device, an in-vehicle device, or a wireless device built into the above device (such as a communication module, a modem, or a chip system, etc.). The terminal device is used to connect people, objects, machines, etc., and can be widely used in various scenarios, such as but not limited to the following scenarios: cellular communication, device-to-device communication (device-to-device, D2D), vehicle to everything (vehicle to everything, V2X), machine-to-machine / machine-type communication (machine-to-machine / machine-type communications, M2M / MTC), Internet of Things (IoT), virtual reality (virtual reality, VR), augmented reality (augmented reality, AR), industrial control (industrial control), self-driving, remote medical, smart grid, smart furniture, smart office, smart wearable, smart transportation, smart city, drone, robot and other scenarios. The terminal device may sometimes be referred to as user equipment (UE), terminal, access station, UE station, remote station, wireless communication device, or user device, etc. For ease of description, the terminal device is described using UE as an example in the embodiments of the present application.

[0036] The network devices in the embodiments of the present application include, for example, access network devices and / or core network devices. The access network device is a device with wireless transceiver functions, which is used to communicate with the terminal device. The access network device includes but is not limited to base stations (BTS, Node B, eNodeB / eNB, or gNodeB / gNB) in the above-mentioned communication system, transmission reception points (TRP), base stations subsequently evolved from the third generation partnership project (3GPP), access nodes in wireless fidelity (Wi-Fi) systems, wireless relay nodes, wireless backhaul nodes, etc. The base station can be: a macro base station, a micro base station, a pico base station, a small station, a relay station, etc. Multiple base stations can support the networks of the same access technology mentioned above, or they can support the networks of the different access technologies mentioned above. The base station can include one or more co-sited or non-co-sited transmission and reception points. The network device can also be a wireless controller, a centralized unit (CU), and / or a distributed unit (DU) in a cloud radio access network (CRAN) scenario. The network device can also be a server, a wearable device, or an in-vehicle device, etc. For example, the network device in the vehicle to everything (V2X) technology can be a road side unit (RSU). The following describes the access network device taking the base station as an example. The base station can communicate with the terminal device, or communicate with the terminal device through a relay station. The terminal device can communicate with multiple base stations in different access technologies. The core network device is used to implement functions such as mobility management, data processing, session management, policy and billing. The names of the devices that implement the core network functions in systems with different access technologies may be different, and the embodiments of the present application are not limited to this. Taking the 5G system as an example, the core network equipment includes: access and mobility management function (AMF), session management function (SMF), policy control function (PCF) or user plane function (UPF), etc.Taking the 4G system as an example, the core network equipment includes: mobility management entity (MME), serving gateway (SGW), policy and charging rules function (PCRF) or public data network gateway (PGW), etc.

[0037] In the embodiments of the present application, the communication device for implementing the network device function may be a network device, or may be a device capable of supporting the network device to implement the function, such as a chip system, which may be installed in the network device. In the technical solutions provided in the embodiments of the present application, the technical solutions provided in the embodiments of the present application are described by taking the network device as an example of the device for implementing the network device function being a network device.

[0038] In the embodiments of the present application, the number of nouns, unless otherwise specified, means "singular noun or plural noun", that is, "one or more". "At least one" means one or more, and "plural" means two or more. "And / or" describes the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. For example, A / B means: A or B. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c means: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, c can be single or multiple.

[0039] The ordinal numbers such as "first" and "second" mentioned in the embodiments of the present application are used to distinguish multiple objects, and are not used to limit the size, content, order, timing, priority or importance of multiple objects. For example, the first cycle and the second cycle can be the same cycle or different cycles, and this name does not indicate the difference in the duration, time domain position, priority or importance of the two cycles. In addition, the numbering of the steps in the various embodiments introduced in this application is only for distinguishing different steps, and is not used to limit the order between the steps. For example, step S401 may occur before step S402, or may occur after S402, or may occur at the same time as S402.

[0040] The following describes technical features related to resource selection in SL.

[0041] In the new radio (NR) SL mode 2, i.e., distributed mode, the TX UE can select the SL communication resources for transmission from the SL resource pool through the two processes of resource sensing and resource selection to avoid interference between different UEs as much as possible. In order to facilitate resource sensing, the sidelink control information (SCI) can be divided into two parts, namely SCI 1 and SCI 2. SCI 1 can also be called the first stage SCI, and SCI 2 can also be called the second stage SCI. SCI 1 can be transmitted via PSCCH, and SCI 2 can be transmitted via PSSCH. For example Figure 1 The PSCCH in can carry SCI 1, and Figure 1 One or more PSSCHs in the SCI 1 may carry the SCI 2 corresponding to the SCI 1. SCI 1 primarily carries information related to physical sidelink shared channel (PSSCH) resource scheduling and information for decoding SCI 2; SCI 2 primarily carries information related to decoding data carried on the PSSCH.

[0042] like Figure 2As shown, when the TX UE performs resource selection, it first sets a trigger time n, which is, for example, the time for determining resource selection, or the current time. A resource perception window is set before time n, and a resource selection window is set after time n. In the resource perception window, the TX UE detects SCI 1 from other TX UEs on all subchannels, where a subchannel is composed of multiple consecutive resource blocks (RBs). If the SCI 1 from other TX UEs is successfully decoded, the TX UE can obtain the resource reservation indication of the other TX UE and the position of the demodulation reference signal (DMRS) carried on the PSSCH, so that the reference signal received power (RSRP) can be measured based on the DMRS carried on the PSCCH or the DMRS carried on the PSSCH from the other TX UE to determine the resources occupied (or reserved) by the other TX UE. If one or more subchannels in the resource selection window are not occupied by other TX UEs, or if they are occupied by other TX UEs but the RSRP measured on these subchannels is less than a first threshold, then these one or more subchannels are considered as available candidate resources in the resource selection window. The first threshold may be determined based on the priority of a transport block (TB) to be transmitted by the TX UE and the priority of transport blocks transmitted by other TX UEs.

[0043] After determining the available candidate resources, the TX UE can select resources for transmission from the available candidate resources in the resource selection window. When transmitting on the selected resources, the TX UE can indicate the resources occupied by the current transport block and / or the resources reserved for retransmission of the current transport block in SCI1. One TB can be transmitted through one PSSCH. If the TX UE needs to transmit multiple TBs periodically, it can also indicate the resource reservation period in SCI1, which means that the TX UE reserves periodic resources. Each period contains resources reserved for initial transmission and / or retransmission of one TB. Each reserved resource corresponds to the same frequency domain resource in different periods.

[0044] On the other hand, in the SL communication mechanism, the UE needs to detect the PSCCH of other UEs on all sub-channels in the resource pool. If one or more PSCCHs are detected, the SCI 2 carried by the PSSCH associated with each PSCCH in the one or more PSCCHs is decoded to obtain the source address (identifier, ID) and destination ID indicated by each SCI 2, and determine whether to decode the data carried by the PSSCH carrying the SCI 2 based on the source ID and / or destination ID indicated by the SCI2.

[0045] As can be seen, the TX UE needs to send an SCI for each PSSCH. The SCI is used by other UEs to avoid interference when selecting resources, and by the RX UE to receive data (the RX UE needs to decode the SCI associated with each PSSCH). However, for periodic services, if the TX UE's data packet transmission period and data packet size and other parameters are relatively fixed, most of the information included in the SCI associated with multiple PSSCHs remains essentially unchanged. In this case, the RX UE decodes the SCI associated with each PSSCH, and the information obtained is relatively similar. It can be considered that the RX UE performs multiple redundant decoding processes, and the decoding process also generates higher power consumption. In addition, the TX UE sends the SCI for each PSSCH, which wastes transmission resources.

[0046] In view of this, a technical solution of an embodiment of the present application is provided. In an embodiment of the present application, for example, the first periodic service (or, referred to as the first periodic transmission) includes M transmissions, and the M transmissions may correspond to P second times, and the second time may be used to send a second SCI. The first terminal device can send the second SCI at N second times without sending the second SCI at P second times, that is, the first terminal device does not need to send SCI (first SCI and / or second SCI) for all transmission blocks of the first periodic service, which reduces the number of times the SCI is decoded for the second terminal device, thereby reducing the power consumption of the second terminal device. Moreover, since the number of SCIs sent by the first terminal device is reduced, the transmission overhead can also be reduced.

[0047] The technical solutions provided in the embodiments of the present application can be applied to the fourth generation mobile communication technology (4G) system, such as the long term evolution (LTE) system, or can be applied to the 5G system, such as the new radio (NR) system, or can also be applied to the next generation mobile communication system or other similar communication systems, without specific limitations. In addition, the technical solutions provided in the embodiments of the present application can be applied to device-to-device (D2D) scenarios, such as NR-D2D scenarios, etc., or can be applied to V2X scenarios, such as NR-V2X scenarios, etc. For example, it can be applied to the Internet of Vehicles, such as V2X, vehicle-to-vehicle (V2V), etc., or can be used in the fields of intelligent driving, assisted driving, or intelligent connected vehicles; for example, it can be applied to scenarios such as extended reality (XR) or screen projection.

[0048] For reference Figure 3A , is a schematic diagram of an application scenario of an embodiment of the present application. Figure 3A , UE1 and UE2 can communicate. UE1 and UE2 may both be within the coverage of the network device (in-coverage); or UE1 and UE2 may both be outside the coverage of the network device (out-of-coverage); or UE1 is within the coverage of the network device and UE2 is outside the coverage of the network device; or UE2 is within the coverage of the network device and UE1 is outside the coverage of the network device. For example, for UEs within the coverage of the network device, the network control mode may be used to determine the SL communication resources, and / or the distributed mode may be used to determine the SL communication resources; for UEs outside the coverage of the network device, the distributed mode may be used to determine the SL communication resources. The embodiments of the present application do not limit the network coverage of UE1 and UE2.

[0049] You can refer to it again Figure 3B , which is a schematic diagram of another application scenario of an embodiment of the present application. Figure 3A Taking unicast communication as an example, Figure 3B It can be regarded as a multicast communication process. Figure 3B In the example, UE1 can communicate with UE2, UE3, and UE4. Similarly, there is no restriction on the network coverage of UE1, UE2, UE3, and UE4.

[0050] Figure 3A or Figure 3BThe network device in the embodiment is, for example, an access network device, and the access network device is, for example, a base station. Among them, the access network device corresponds to different devices in different systems, for example, in a 4G system it may correspond to an eNB, and in a 5G system it may correspond to an access network device in 5G, such as a gNB. Of course, the technical solution provided in the embodiment of the present application can also be applied to future mobile communication systems, so Figure 3A or Figure 3B The access network device in the embodiment of the present application may also correspond to a network device in a future mobile communication system. In the embodiment of the present application, the access network device is a base station as an example. In fact, referring to the above description, the access network device may also be an RSU or other device.

[0051] The following describes the method provided by the embodiment of the present application in conjunction with the accompanying drawings. In the accompanying drawings corresponding to the various embodiments of the present application, all optional steps are represented by dotted lines. The various embodiments of the present application can be applied to Figure 3A The network architecture shown in FIG. 1 , the first UE described in each embodiment of the present application is, for example, Figure 3A UE1 in the embodiment of the present application, the second UE described in each embodiment of the present application is, for example, Figure 3A UE2 in; or, the first UE described in each embodiment of the present application is, for example, Figure 3A UE2 in the embodiment of the present application, the second UE is, for example, Figure 3A Alternatively, each embodiment of the present application can be applied to Figure 3B The network architecture shown in FIG. 1 , the first UE described in each embodiment of the present application is, for example, Figure 3B UE1 in the embodiment of the present application, the second UE described in each embodiment of the present application is, for example, Figure 3B UE2, UE3 or UE4 in; or, the first UE described in each embodiment of the present application is, for example, Figure 3B UE2, UE3 or UE4, the second UE described in each embodiment of the present application is, for example, Figure 3B UE1 in.

[0052] This application embodiment provides a communication method, see Figure 4 , which is a flowchart of the method.

[0053] S401: A first UE sends fifth configuration information. Correspondingly, a second UE receives the fifth configuration information from the first UE.

[0054] The fifth configuration information is, for example, included in radio resource control (RRC) signaling or media access control (MAC) control element (CE), or may also be included in other signaling. In the embodiment of the present application, the fifth configuration information is included in the RRC signaling as an example. The RRC signaling, for example, indicates one or more configurations, or the RRC signaling, for example, includes one or more configuration information, for example, one configuration information corresponds to one configuration, the fifth configuration information is one of them, and the fifth configuration information corresponds to the first configuration, for example. There may be multiple periodic services, and the transmission requirements of different periodic services may be different. For example, the transmission periods of different periodic services may be different. Therefore, the embodiment of the present application provides one or more configurations, and different configurations can be applicable to different periodic services. Different configurations correspond to at least one different parameter. For example, the duration of the period corresponding to different configurations may be equal or may not be equal. For another example, the hybrid automatic repeat request (HARQ) information corresponding to different configurations may be the same or different. The RRC signaling includes one or more configuration information, each of which includes, for example, an index of the configuration information (or, an index of the configuration corresponding to the configuration information, or an index of the periodic transmission corresponding to the configuration information), and / or includes HARQ information of the periodic transmission corresponding to the configuration information. Taking the fifth configuration information as an example, the fifth configuration information includes, for example, an index of the first periodic transmission, and / or includes HARQ information of the first periodic transmission. The HARQ information corresponding to the periodic transmission includes, for example, information about the initial HARQ process number occupied by the periodic transmission and / or the number of HARQ process numbers occupied. For example, if there are a total of 8 HARQ process numbers available for the first periodic transmission, the number of HARQ process numbers occupied by the first periodic transmission is 8. For example, if the index of the initial HARQ process number occupied by the first periodic transmission is 7, the index of the HARQ process number occupied by the second transport block of the first periodic transmission is 8, the index of the HARQ process number occupied by the third transport block of the first periodic transmission is 1, and so on.

[0055] In an embodiment of the present application, the scheduling mode under one configuration is equivalent to semi-persistent scheduling (SPS). Therefore, the "configuration" described in the embodiment of the present application may also be referred to as an "SPS configuration", the period corresponding to the configuration may also be referred to as an SPS period, and the index corresponding to the configuration may also be referred to as an SPS index or an SPS configuration index. For example, the "first configuration" may also be referred to as the "first SPS configuration", the "first period" may also be referred to as the "first SPS period", and the index corresponding to the first configuration may also be referred to as the "first SPS index".

[0056] Alternatively, the first UE may not send the fifth configuration information, so S401 is an optional step.

[0057] S402: The first UE sends a first SCI at N first times. Correspondingly, the second UE can detect the first SCI at the N first times. In other words, the second UE can receive and detect the first SCI at the N first times.

[0058] The first SCI may indicate the first configuration information, or the first SCI may include the first configuration information. The first configuration information may indicate resources for the first periodic transmission. For example, the first configuration information includes information about the resources for the first periodic transmission, and the resources for the first periodic transmission include time domain resources and / or frequency domain resources. Optionally, the transmission period of the first periodic transmission is, for example, the first period, and the first period may also be indicated by the first configuration information.

[0059] The periodic transmission may include M transmissions, one of the M transmissions may be completed within a first period, and one transmission may be completed using one or more resources. M may be an integer greater than 1. For example, a plurality of consecutive time periods having a duration equal to the first period may be obtained in the time domain, each of which may be considered a first period. One of the time periods may include one of the M transmissions, for example, one or more resources within the time period may be used to carry a transport block for the transmission. One or more transport blocks may be transmitted in one transmission.

[0060] One of the M transmissions may be carried on one or more resources within a first period. Therefore, one of the M transmissions may correspond to one or more transmission times. For example, M transmissions correspond to P transmission times, where P is an integer greater than or equal to M, e.g., a multiple of M. The transmission time here can be understood as the transmission time of a transport block corresponding to the periodic service, and P can also be understood as the number of transport blocks sent in the M transmissions. It should be understood that P here refers to the maximum number of transport blocks that can be sent in the M transmissions, or the number of transport blocks determined based on the resources of the first periodic transmission. When the first UE sends a transport block, it may send it on every resource of the first periodic transmission. In this case, the number of transport blocks actually sent in the M transmissions is P. Alternatively, the first UE may not send it on every resource of the first periodic transmission, but rather on some of the resources. In this case, the number of transport blocks actually sent in the M transmissions is less than P. In other words, if a periodic service is transmitted P times within M first periods, for example, each transmission corresponds to a transmission time. In addition, the M transmissions may also correspond to P first times and P second times, and the first time, second time, and transmission time may be in a one-to-one correspondence; or, regardless of how many transmission times a transmission corresponds to, it may correspond to only one first time and only one second time. In this case, the M transmissions may correspond to P transmission times, and to M first times and M second times. For the first UE, the first time may be understood as the time for transmitting the first SCI, and the second time may be understood as the time for transmitting the second SCI; for the second UE, the first time may be understood as the time for detecting the first SCI, and the second time may be understood as the time for detecting the second SCI. In the following description, the one-to-one correspondence between the first time, second time, and transmission time is mainly used as an example.

[0061] For example, for a certain transmission among M transmissions, the transmission corresponds to I first times, I second times, and I transmission times, where I is a positive integer and I is less than P. For example, I is the maximum number of transport blocks that can be sent in the transmission, or the number of transport blocks determined according to the resources of the first periodic transmission corresponding to the transmission. Figure 5A or Figure 5B . Figure 5A and Figure 5B The periodic transmission includes 2 transmissions as an example. For example, the transmission is Figure 1 The first cycle in the transmission corresponds to, Figure 5A or Figure 5B A box in represents a time slot. Figure 5A or Figure 5BIn the example, each first cycle includes 4 resources, as shown in the horizontal line box, where each resource transmits a transmission block, for example. Then, a maximum of 4 transmission blocks can be sent in one transmission, so I=4, and P=8. In actual applications, a horizontal line box may correspond to (or include) one or more of a first time, a second time, or a transmission time, that is, the i-th first time, the i-th second time, and the i-th transmission time, and these three may be located in different time slots respectively; or, any two of these three may be located in the same time slot, and another of these three may be located in another time slot; or, these three may also be located in the same time slot. For example Figure 5A In , each horizontal line box may correspond to a first time, a second time, and a transmission time, which means that the i-th first time, the i-th second time, and the i-th transmission time are located in the same time slot; for example Figure 5B In , each horizontal box can correspond to a first time and a second time, and the transmission time corresponds to the next box, which means that the i-th first time and the i-th second time are in the same time slot, and the i-th transmission time is in the next time slot of the time slot. In addition, the N first times are a proper subset of the P first times. Figure 5A and Figure 5B Where N is less than 8, the first N can be Figure 5A or Figure 5B For example, if N is less than 4, the N first times may be located within one first period or within two first periods; if N is greater than 4, the N first times may be located within two first periods. Figure 5A and Figure 5B Take N=1 as an example. For example, the first time is Figure 5A or Figure 5BThe first first time shown (i.e., i=1). The i-th second time among the I second times corresponds to the i-th first time among the I first times, and the correspondence here is understood to mean, for example, that the i-th first time and the i-th second time are in the same time slot, or, the first SCI sent at the i-th first time may indicate the resource of the second SCI sent at the i-th second time, or, the i-th second time is the most recent second SCI sending time for the i-th first time, or, the first SCI sent at the i-th first time may schedule the second SCI sent at the i-th second time. Similarly, the i-th transmission time among the i-th transmission times corresponds to the i-th second time among the i-th second times (or the i-th first time among the i-th first times). The correspondence here means, for example, that the i-th transmission time and the i-th second time (or the i-th first time) are in the same time slot, or that the second SCI sent at the i-th second time (or the first SCI sent at the i-th first time) can be scheduled for the transport block sent at the i-th transmission time, or that the i-th transmission time is the transmission time of the most recent transport block for the i-th second time (or the i-th first time). If the first SCI indicates the resource location of the second SCI and / or indicates the resource location of the i-th transport block, then the i-th second time is not necessarily the transmission time of the most recent second SCI for the i-th first time. Similarly, the i-th transmission time is not necessarily the transmission time of the most recent transport block for the i-th second time (or the i-th first time). Among them, the i-th first time can be used to send the first SCI, the i-th second time can be used to send the second SCI, the i-th transmission time can be used to send the i-th transmission block of this transmission (a total of I transmission blocks are sent in this transmission), and i is an integer greater than or equal to 1 and less than or equal to I.

[0062] In the embodiments of the present application, "transmission time" may refer to the transmission moment, or may also refer to the transmission duration, or the transmission time slot; "first time" may refer to the first moment, or may also refer to the first duration, or the first time slot; "second time" may refer to the second moment, or may also refer to the second duration, or the second time slot.

[0063] Optionally, the i-th second time and the i-th transmission time may be the same time. That is, the time for sending the second SCI and the time for sending the transport block scheduled by the second SCI may be the same time. For example, if the second SCI and the transport block are sent in the same time slot, the time for sending the second SCI and the time for sending the transport block may be considered to be the same time. Alternatively, there is a first time offset between the i-th second time and the i-th transmission time, and the i-th second time is located before the i-th transmission time. The first time offset is, for example, indicated by the first SCI, or predefined by a protocol, or preconfigured by a network device, or preconfigured in the first UE and / or the second UE. That is, the time for sending the second SCI and the time for sending the transport block scheduled by the second SCI may be different times. For example, if the second SCI and the transport block are sent in different time slots, the time for sending the second SCI and the time for sending the transport block may be different times. In this way, the technical solutions of the embodiments of the present application can be used for scheduling within the same time slot as well as for scheduling across time slots, providing greater flexibility.

[0064] Optionally, the i-th first time and the i-th second time may be the same time, that is, the time for sending the first SCI and the time for sending the second SCI scheduled by the first SCI may be the same time. For example, if the second SCI and the first SCI are sent in the same time slot, then the time for sending the second SCI and the time for sending the first SCI may be regarded as the same time. Alternatively, there is a second time offset between the i-th second time and the i-th first time. The second time offset is, for example, indicated by the first SCI, or predefined by a protocol, or preconfigured by a network device, or preconfigured in the first UE and / or the second UE. That is, the time for sending the second SCI and the time for sending the first SCI scheduled by the first SCI may be different times. For example, if the second SCI and the first SCI are sent in different time slots, then the time for sending the second SCI and the time for sending the first SCI may be different times.

[0065] Optionally, the i-th first time, the i-th second time, and the i-th transmission time are the same time. For example, in the i-th transmission, the first SCI, the second SCI, and the transmission block are all sent in the same time slot, then the i-th first time, the i-th second time, and the i-th transmission time are considered to be the same time. Figure 5ATake this as an example. Or, the i-th first time, the i-th second time, and the i-th transmission time are different times. For example, in the i-th transmission, the first SCI, the second SCI, and the transmission block are sent in three time slots, then the i-th first time, the i-th second time, and the i-th transmission time are all different times, and the three time slots can be continuous in the time domain, or two of the time slots are continuous and the other time slot is discontinuous, or all three time slots are discontinuous. Or, any two of the i-th first time, the i-th second time, and the i-th transmission time are the same time, and the other one is a different time, or simply described as the i-th first time, the i-th second time, and the i-th transmission time are not completely the same time. For example, in the i-th transmission, the first SCI and the second SCI are sent in one time slot, and the transmission block is sent in another time slot, then the i-th first time, the i-th second time, and the i-th transmission time are not completely the same time, and the two time slots can be continuous or discontinuous in the time domain. Figure 5B Taking this as an example, Figure 5B Take the example of these two consecutive time slots; for another example, in the i-th transmission, the first SCI is sent in one time slot, and the second SCI and the transmission block are sent in another time slot. It can be considered that the i-th first time, the i-th second time and the i-th transmission time are not exactly the same time, and these two time slots can be continuous or discontinuous in the time domain.

[0066] The first times corresponding to the M transmissions may include N first times, where the N first times correspond to, for example, C1 transmissions among the M transmissions, where C1 is a positive integer less than or equal to N, and C1 is less than M, and C1 is less than P. The N first times may be associated with N transmission times, and the N transmission times may send N transmission blocks, where the N transmission blocks are a subset of the P transmission blocks. For example, the jth transmission block among the N transmission blocks may be a transmission block that occurs at the jth transmission time among the N transmission times, or in other words, the jth transmission block among the N transmission blocks may be the most recent transmission block that occurs after the jth first time among the N first times (the most recent transmission block after the jth first time, that is, the transmission block sent at the jth transmission time). For example, j may be an integer from 1 to N. N is a positive integer, and N is less than P. Since N is less than P, this indicates that the first UE sent the first SCI at some of the P first times. This means that the first UE does not need to send the first SCI for every transport block of the first periodic transmission. This reduces the number of first SCIs sent, saving transmission overhead. The second UE also does not need to receive excessive amounts of first SCI, thereby reducing power consumption incurred by decoding the first SCI.

[0067] The first SCI indicates the first configuration information. For the second UE, if the first SCI is not detected at the first time corresponding to a certain transmission, the second UE can also determine the resources of the transmission time corresponding to the transmission based on the first configuration information indicated by the first SCI received previously (for example, the most recently received), thereby detecting the transmission block of the first periodic transmission at the transmission time corresponding to the transmission. For example, the first UE sends the first transmission block corresponding to the first periodic transmission on the first resource, and the first resource is a resource belonging to PN transmission times, for example, the first resource is a resource of the first transmission time among the PN transmission times, and P is the total number of transmission blocks of M transmissions, and P can be greater than or equal to M. It can be seen that the second UE does not detect the first SCI at the first time associated with the first transmission block. Then the second UE can determine the first resource based on the first SCI received most recently (that is, most recently in the time domain) before the first resource, thereby receiving and detecting the first transmission block on the first resource. In other words, the first UE does not need to indicate resources every time it transmits a transport block for periodic services. Instead, it only needs to indicate resources when transmitting a portion of the transport blocks. This is equivalent to a first SCI that can schedule the transmission of multiple transport blocks. The second UE can detect the transport blocks at subsequent transmission times based on the first configuration information indicated by the previously received first SCI. In this way, the second UE can detect the transport blocks normally, and the number of first SCIs sent by the first UE can be reduced, saving transmission overhead and also saving the power consumption caused by the second UE detecting and decoding the first SCI.

[0068] Since the first SCI can indicate the resources of the first periodic transmission, in addition to the receiving end of the first periodic transmission (such as the second UE) being able to determine the resources of the first periodic transmission based on the first SCI, other UEs that receive the first SCI can also perform resource perception based on the first SCI, thereby avoiding occupying the resources of the first periodic transmission as much as possible to reduce collisions. To this end, optionally, in addition to sending the first SCI at N first times, the first UE can also send the first SCI at another K first times. In order to distinguish it from the first SCI sent at the N first times, the first SCI sent at the K first times can be called the third SCI. The K first times, for example, correspond to C2 transmissions in M ​​transmissions, for example, C2 is a positive integer less than or equal to K, and the K first times, for example, correspond to K transmission times. K transmission blocks can be transmitted at the K transmission times. Therefore, it can be considered that the K first times are associated with the K transmission blocks. Alternatively, K third SCIs sent at K first times may schedule K transport blocks, where one third SCI schedules one transport block. Therefore, the K first times are considered to be associated with K transport blocks, where one first time is associated with one transport block. K is a positive integer and is less than P. For example, the transmissions corresponding to the K first times do not intersect with the transmissions corresponding to the N first times. For example, the K transport blocks are the transport blocks in the P transport blocks excluding the N transport blocks.

[0069] The third SCI may indicate the second configuration information, and the second configuration information may indicate the resources of the first periodic transmission. Optionally, the second configuration information is the same as all or part of the first configuration information indicated by the first SCI sent most recently before the third SCI is sent. For example, the first SCI and the third SCI are the same type of SCI, such as SCI 1. That is, the first UE may send an SCI that can indicate the resources of the first periodic transmission in multiple first times, which can increase the probability of other UEs detecting such SCI, so that other UEs can perform resource perception more effectively. However, for the second UE, it may receive and detect the first SCI at N first times, but may not receive and detect the third SCI at K first times, or may receive and detect the third SCI only at some of the K first times. It can be understood that the main purpose of the first UE sending the third SCI is to enable other UEs except the second UE to perform resource perception and resource selection. The second UE can clearly identify the resources of the first periodic transmission by receiving the first SCI at N first times. Therefore, the second UE does not need to detect the third SCI again, or the second UE does not need to detect the SCI used to indicate the resources of the first periodic transmission more times, thereby reducing the power consumption of the second UE due to detecting SCI.

[0070] It can be seen that the timing when the first UE sends the first SCI may not be exactly the same as the timing when the second UE detects the first SCI. For example, the first UE will send the first SCI at N first times and K first times (the third SCI can also be regarded as the first SCI, but it has different names just to distinguish the SCI sent at different times), but the second UE can detect the first SCI at N first times, and may not detect the first SCI at all or part of the K first times. To this end, a second period can also be configured, and the second period can be used for the receiving end of the first periodic transmission (such as the second UE) to detect the first SCI. For example, the duration of the second period can be greater than or equal to the duration of the first period. The first UE can send the first SCI according to the second period, and the first SCI can indicate whether to send the second SCI. For example, among the first SCIs sent according to the second period, N first SCIs all indicate that the second SCI will be sent. These N first SCIs are the first SCIs sent at the N first times. However, all or part of the K first times are not the transmission time of the first SCI corresponding to the second period. Therefore, the second UE can detect the first SCI at the N first times, but not detect the first SCI at all or part of the K first times. For example, the second period can be configured by the first UE, then the first UE can send third configuration information to the second UE, the third configuration information can configure the second period, and the second UE can detect the first SCI according to the second period after receiving the third configuration information. Alternatively, the second period can also be configured by the network device, and the network device can send the third configuration information to the first UE and the second UE respectively. Alternatively, the second period can also be pre-configured in the first UE and the second UE, or can also be predefined by a protocol, etc., then the first UE or the network device does not need to send the third configuration information to the second UE.

[0071] Optionally, the second period may also be the duration of the first SCI configuration and the second SCI configuration, and after the second period ends, the first configuration information is no longer effective. It can also be understood that after an SPS configuration is activated, there may be no deactivation operation, and deactivation can be automatically achieved after the second period ends.

[0072] S403: The first UE transmits a second SCI associated with the first SCI at N second times. Accordingly, the second UE may detect the second SCI associated with the first SCI at the N second times. In other words, the second UE may receive and detect the second SCI associated with the first SCI at the N second times. The first SCI transmitted at the N first times and the second SCI transmitted at the N second times may be used to schedule the M transmissions included in the first periodic transmission. Therefore, it can be understood that the M transmissions refer to the transmission of the transport block corresponding to the first periodic transmission.

[0073] Optionally, the second SCI may also indicate the index of the first periodic transmission, and / or indicate the HARQ information of the first periodic transmission. Alternatively, the first SCI may indicate the index of the first periodic transmission, and / or indicate the HARQ information of the first periodic transmission. Alternatively, the first SCI may indicate the index of the first periodic transmission, and the second SCI may indicate the HARQ information of the first periodic transmission; the second SCI may indicate the index of the first periodic transmission, and the first SCI may indicate the HARQ information of the first periodic transmission. If S401 is executed, it can be understood that the network device indicates multiple configurations through RRC signaling, and then indicates one of the configurations through the first SCI and / or the second SCI. This configuration is the first configuration described above. Alternatively, S401 may not be executed, and the first configuration may be indicated through the first SCI and / or the second SCI.

[0074] There is a one-to-one correspondence between the N first times and the N second times. For example, a first SCI sent at a first time among the N first times is associated with a second SCI sent at the second time corresponding to the first time. A second SCI is associated with a first SCI, for example, meaning that the second SCI is sent only when the first SCI is sent. If the first SCI is sent, the second SCI may or may not be sent; if the first SCI is not sent, the second SCI will not be sent.

[0075] Optionally, the first SCI may include second indication information, which may indicate whether to send the second SCI. The second indication information, for example, occupies one or more bits. For example, if the second indication information occupies one bit, if the value of this bit is "1," it indicates that the second indication information instructs to send the second SCI, while if the value of this bit is "0," it indicates that the second indication information instructs not to send the second SCI. Alternatively, regardless of the number of bits the second indication information occupies, if the first SCI includes the second indication information, it indicates that the second indication information instructs to send the second SCI, while if the first SCI does not include the second indication information, it indicates that the second indication information instructs not to send the second SCI. Alternatively, the second indication information may also be indicated in other ways. If the second indication information instructs to send the second SCI, it indicates that the second SCI associated with the first SCI will be subsequently sent. The second UE can continue to receive and detect the second SCI based on the second indication information. If the second indication information instructs not to send the second SCI, it indicates that the second SCI associated with the first SCI will not be sent. The second UE may not detect the second SCI associated with the first SCI based on the second indication information, thereby reducing power consumption of the second UE. That is to say, whether the second UE detects the second SCI associated with the first SCI can be determined based on the second indication information included in the first SCI. As mentioned above, the first UE can also send a third SCI. Optionally, when the first UE sends the third SCI, it may not send the second SCI associated with the third SCI. For example, the second indication information included in the third SCI may indicate that the associated second SCI is not sent, or the third SCI may not include the second indication information. The second SCI is used for detection by the second UE, while the third SCI is mainly used for resource perception by other UEs. The second UE does not need to detect, so the first UE does not need to send the second SCI associated with the third SCI to save transmission overhead.

[0076] For example, if a first UE sends N first SCIs at N first times, each of the N first SCIs may indicate first configuration information. The first configuration information indicated by different first SCIs may be the same or different. For example, the first configuration information indicated by first SCIs sent at different first times may be different. For example, a first period corresponds to one transmission, and this transmission corresponds to three first times, and three transmission times. The first UE sends two first SCIs at the first two of these three first times. These two first SCIs indicate two pieces of first configuration information. The first configuration information indicated by the first first SCI in the time domain may indicate the resources corresponding to the next two transmission times (the next two transmission times refer to the transmission times corresponding to the next two first times, and the first times correspond to the transmission times in a one-to-one relationship), and the first configuration information indicated by the second first SCI in the time domain may indicate the resources corresponding to the next transmission time. Therefore, the content of the first configuration information indicated by these two first SCIs is different. Alternatively, even if multiple first SCIs are sent at different first times corresponding to a single transmission, the first configuration information indicated by each of the first SCIs can indicate all resources corresponding to that transmission, and the content of the first configuration information indicated by these multiple first SCIs is identical. Similarly, the second configuration information indicated by the third SCI may be identical in whole or in part to the first configuration information indicated by the first SCI sent most recently before the third SCI is sent, and this may also be understood in reference to the method described herein.

[0077] For example, the second SCI may indicate that the first configuration information included in the first SCI associated with the second SCI is effective, ineffective, or no longer effective. It can also be understood that the second SCI may indicate that the first configuration information included in the first SCI associated with the second SCI is activated, inactivated, or deactivated. For example, the second SCI includes an SPS indication, and the SPS indication may indicate that the first configuration information included in the first SCI associated with the second SCI is effective, ineffective, or no longer effective, or indicate that the first configuration information included in the first SCI associated with the second SCI is activated, inactivated, or deactivated. For example, if the first configuration information indicated by the first SCI needs to be activated (or, becomes effective), the second indication information may indicate that the second SCI is sent, and the second UE may receive and detect the second SCI according to the second indication information. The second SCI may indicate that the first configuration information indicated by the first SCI associated with the second SCI is effective. The second UE may determine that the first configuration information indicated by the first SCI is effective according to the second SCI. After receiving the second SCI, the second UE may detect the first periodic service according to the resources configured by the first configuration information. For another example, the first configuration information is currently in effect, and the second UE currently detects the periodic service according to the resources configured by the first configuration information. If the first configuration information needs to be deactivated (or no longer in effect), the second indication information may indicate the sending of the second SCI, and the second UE may receive and detect the second SCI according to the second indication information. The second SCI may indicate that the first configuration information indicated by the first SCI associated with the second SCI is no longer in effect. The second UE can determine that the first configuration information indicated by the first SCI is no longer in effect according to the second indication information, and then after receiving the second SCI, the second UE may no longer detect the first periodic service according to the resources configured by the first configuration information. For another example, the first configuration information is currently in effect, and the second UE currently detects the first periodic service according to the resources configured by the first configuration information. Next, the first configuration information can continue to be applied without deactivation or activation. The second indication information may indicate that the second SCI is not sent, and the second UE may not detect the second SCI. For another example, currently no configuration information for indicating resources for the first periodic service is effective, and such configuration information does not need to be effective, then the second indication information may indicate not to send the second SCI, and the second UE may not detect the second SCI.For example, there may be other configuration information that is currently in effect (other configuration information except the first configuration information), or there may be no configuration information that is in effect, and the first configuration information does not need to be effective at present. In this case, the second indication information may indicate the sending of a second SCI. The second UE may receive and detect the second SCI according to the second indication information. The second SCI may indicate that the first configuration information indicated by the first SCI associated with the second SCI is not in effect. The second UE may determine that the first configuration information indicated by the first SCI is not in effect according to the second indication information. After receiving the second SCI, the second UE does not detect the first periodic service according to the resources configured by the first configuration information. In other words, whether the first UE sends the second SCI depends on whether there is a need to send the second SCI.

[0078] Alternatively, whether the first configuration information included in the first SCI is effective, ineffective, or no longer effective may also be indicated by the first SCI. For example, the first SCI may include an SPS indication for indicating that the first configuration information is effective, ineffective, or no longer effective. The embodiments of the present application do not limit the subject of the indication.

[0079] Furthermore, the resource sizes mapped to transport blocks may differ between cases where the first SCI and the transport block for the first periodic service are sent in a single transmission but the second SCI is not sent, and cases where the first SCI, the second SCI, and the transport block for the first periodic service are sent in a single transmission. If the second SCI is also sent, the resources mapped to the transport block may be smaller, whereas if the second SCI is not sent, the resources mapped to the transport block may be larger. This means that if the second SCI is not sent, the resources originally used to carry the second SCI can be used instead to carry the transport block. Therefore, when mapping transport blocks, the first UE can adaptively adjust the transport block size (TB size) to improve resource utilization.

[0080] Optionally, the first UE may not send the second SCI at PN second times. The PN second times correspond to, for example, C3 transmissions among M transmissions, where C3 is a positive integer less than or equal to PN. The PN second times may be associated with PN transmission blocks among P transmission blocks. For example, the PN second SCIs sent at PN second times may schedule PN transmission blocks, and therefore, the PN second times are considered to be associated with the PN transmission blocks. One second SCI schedules one transmission block, and therefore, the PN second times are associated with the PN transmission blocks in a one-to-one relationship. It can be seen that the first UE may not send the second SCI at some of the second times corresponding to the M transmissions, thereby reducing transmission overhead. Furthermore, the second UE does not need to detect the second SCI at these times, thereby reducing the power consumption of the second UE.

[0081] Optionally, the first SCI mentioned above is, for example, SCI 1, and the second SCI is, for example, SCI 2. For example, the second SCI can implement the corresponding function of SCI2, for example, the second SCI can indicate the source address and destination address associated with the first periodic transmission. If the first UE sends multiple second SCIs, then because the multiple second SCIs all correspond to the first periodic transmission, these multiple second SCIs all indicate the source address and destination address associated with the first periodic transmission. Of course, the types of the first SCI and the second SCI are not limited to this. For example, the first SCI and the second SCI can also be both SCI 1 or both SCI 2, or the first SCI is SCI 2, and the second SCI is, for example, SCI 1, and so on. The embodiments of the present application are mainly described by taking the first SCI being SCI1 and the second SCI being SCI 2 as an example. The third SCI is an SCI of the same type as the first SCI, for example, the third SCI is also SCI 1.

[0082] In order to better understand the technical solutions of the embodiments of the present application, the following are provided: Figure 6A 、 Figure 6B 、 Figure 7 as well as Figure 8 These figures are schematic diagrams of the first cycle, the second cycle, and the SCI sending method provided in the embodiments of the present application. These figures are used as examples to introduce the technical solutions of the embodiments of the present application.

[0083] Please refer to Figure 6A , which includes 3 first cycles, one of which is used to transmit a periodic service once, or in other words, one first cycle corresponds to one transmission of a periodic service. Figure 6A The boxes with “\” and the boxes with horizontal lines represent resources for periodic transmission, and one first period corresponds to one transmission. It can be seen that in the first two first periods, the resources corresponding to one transmission include a total of 4 resources, and the first resource of these 4 resources is not continuous with the following 3 resources in the time domain. For example, for any of the first two first periods, the number of corresponding transmission blocks can be less than or equal to 4, the number of corresponding transmission times is equal to the number of transmission blocks, the number of corresponding first times is equal to the number of transmission times, or corresponds to a first time, the number of corresponding second times is equal to the number of transmission times, or corresponds to a second time. For example, the first UE sends a first SCI in the first time slot at the beginning of the second period, Figure 6A The square with “ / ” in the middle represents the first SCI (or the third SCI). For distinction, the first SCI is called the first SCIA, for example. The time of sending the first SCIA is, for example, one of the N first times, and the period of the N first times is, for example, the second period. Figure 6A 、 Figure 6B 、 Figure 7as well as Figure 8 In the example, the length of the second cycle is twice the length of the first cycle. The first SCIA indicates the first configuration information, which can configure the resources used to transmit the periodic service in the first cycle where the first SCIA is located, or configure all resources for the periodic service (or, configure multiple resources used to transmit the periodic service in the first cycle). In addition Figure 6A In the example, the first UE sends the third SCI at the first time associated with the transmission time of the periodic service. These first times can be included in the K first times. The second UE does not detect the third SCI sent at these first times, but other UEs except the second UE can detect these first SCIs to perform resource perception and resource selection. In addition, in addition to sending the first SCI at N first times, the first UE also sends the second SCI at N second times. For example, the first UE also sends the associated second SCI in the time slot where the first SCI A is located. The second SCI can refer to Figure 6A The first UE only sends the first SCI at the K first times, and does not send the associated second SCI at the K second times associated with the K first times. Figure 6A Taking the example that the first SCI and the associated second SCI are continuous in the time domain, the time domain positions of the first SCI and the associated second SCI are not actually limited. Figure 6A In the example, after a second cycle ends, it can be seen that the location of the resources of the periodic service has changed. For example, the first SCI (for example, called the first SCI B) sent by the first UE at the beginning of the second second cycle no longer indicates the first configuration, but another configuration other than the first configuration, for example, called the second configuration. The length of the cycle corresponding to the second configuration is equal to the length of the cycle corresponding to the first configuration, but the location of the resources for sending the periodic service corresponding to the second configuration is different from the location of the resources for sending the periodic service corresponding to the first configuration. It can be seen that in the third first cycle, the resources corresponding to one transmission include a total of 3 resources, and the first resource of these 3 resources is not continuous with the next 2 resources in the time domain. In other words, through the second cycle, the corresponding configuration can be activated, deactivated, not activated, or updated. Among them, updating the configuration can also be understood as activating a new configuration. Figure 6A The example above takes updating the resource location as an example, but the configuration update can also update other parameters, such as the update cycle.

[0084] Please refer to Figure 6B , Figure 6B and Figure 6AThe difference is that the first UE only sends the first SCI at N first times, and does not send the third SCI at K first times. In this way, for UEs other than the second UE, if the first SCI is not detected at N first times, it may not be possible to exclude the time / frequency resources occupied by the periodic service during resource perception. However, for the first UE, transmission overhead can be saved. Figure 6B For other contents, please refer to Figure 6A Introduction.

[0085] Please refer to Figure 7 , Figure 7 and Figure 6A The difference is that in the first two first cycles, the resources corresponding to one transmission include three resources in total, and these three resources are continuous in the time domain. In addition, in the third first cycle, the resources corresponding to one transmission include two resources in total, and these two resources are continuous in the time domain. That is to say, in Figure 6A In , the N first times and the N transmission times are located in the same time slot; Figure 7 In , the N first times and the N transmission times are located in different time slots. Figure 7 For other contents, please refer to Figure 6A Introduction.

[0086] Please refer to Figure 8 , Figure 8 and Figure 7 The difference is that the first UE only sends the first SCI at N first times, but does not send the first SCI at K first times. In this way, for UEs other than the second UE, if the first SCI is not detected at N first times, it may not be possible to exclude the resources occupied by the periodic service during resource perception. However, for the first UE, transmission overhead can be saved. Figure 8 For other contents, please refer to Figure 7 In addition, Figure 6A 、 Figure 6B 、 Figure 7 as well as Figure 8 In the diagram, the horizontal axis represents time and the vertical axis represents frequency.

[0087] When a configuration (e.g., the first configuration) is activated, if the first UE does not send additional instructions, the second UE will detect the transport blocks of the periodic transmission on all resources used to send the periodic transmission included in the first period corresponding to the first configuration by default. For some periodic services, the number of transport blocks sent by the first UE in different first periods may not be exactly the same, or the first UE may use all or part of the resources used to send the periodic service included in the first period to send the transport blocks of the periodic service. For example, refer to Figure 6A, then there are 4 resources included in one first period for sending the periodic service, but the first UE may only send on 2 or 3 of the resources, and will not send on these 4 resources. If the second UE decodes on all 4 resources, it will cause unnecessary waste of power consumption. Optionally, the embodiment of the present application may further include S404, the first UE may send the fourth configuration information at the first time, and accordingly, the second UE may detect the fourth configuration information at the first time. The fourth configuration information may indicate the number of transmission blocks included in each transmission of part or all of the first periodic transmission, and / or indicate the resources of the first periodic transmission occupied by the transmission blocks included in each transmission of part or all of the first periodic transmission. The second UE may detect the transmission block as indicated by the fourth configuration information, and may not detect on the resources where the first UE does not send the transmission block, thereby saving power consumption.

[0088] The first time is, for example, the first time for sending the first SCI in the first second cycle after the first configuration takes effect, for example Figure 6A The time for sending the first SCI A is shown, or the first time is, for example, the first time associated with the transmission time of the first resource (here refers to the first resource in the time domain) for sending the first periodic service in the first first cycle after the first configuration takes effect (also refer to Figure 6A The fourth configuration information is sent as shown in the time of the first SCI A), and as long as the first configuration is not invalid, there is no need to send the fourth configuration information. At this time, the fourth configuration information may indicate the number of transmission blocks included in each transmission of all transmissions of the first periodic transmission from the first time or after the first time, and / or indicate the resources of the first periodic transmission occupied by the transmission blocks included in each transmission of all transmissions of the first periodic transmission. It is equivalent to that the number of transmission blocks sent by the first UE in each first period under the first configuration is the same, and the relative positions of the resources occupied by the transmission blocks are also the same. In this way, this indication method can be used to enable the second UE to detect the transmission block according to the fourth configuration information in each first period through one indication, thereby reducing the number of times the first UE sends the fourth configuration information and saving transmission overhead.

[0089] Alternatively, the first time includes, for example, the first time for sending the first SCI in each second cycle, which is equivalent to, regardless of whether the currently applied configuration is invalid, the first UE can send the fourth configuration information at the first time for sending the first SCI in each second cycle, so that the second UE can clarify the subsequent detection method.

[0090] Alternatively, the first time includes, for example, the first time associated with the transmission time of the first resource used to send the first periodic service in each first cycle. At this time, the fourth configuration information may indicate the number of transmission blocks included in each transmission of the partial transmission of the first periodic transmission from or after the first time, and / or indicate the resources of the first periodic transmission occupied by the transmission blocks included in each transmission of the partial transmission of the first periodic transmission. The partial transmission of the first periodic transmission, for example, is the transmission corresponding to the first cycle where the fourth configuration information is located. One fourth configuration information can indicate the information of the transmission blocks sent in the first cycle where the fourth configuration information is located. That is to say, the first UE can indicate the number of transmission blocks sent in the first cycle and / or the resources occupied by these transmission blocks in each first cycle. For example, the first UE can indicate the number of transmission blocks sent in different first cycles and / or the resources occupied by the transmission blocks sent in different first cycles. This indication method can be used, and this method is more flexible.

[0091] The fourth configuration information is, for example, included in the first SCI, or included in the second SCI, or the fourth configuration information is included in the fourth SCI. The fourth SCI is, for example, SCI 1, but the fourth SCI is different from the first SCI; or, the fourth SCI is, for example, SCI 2, but the fourth SCI is different from the second SCI. Taking the fourth SCI being SCI 2 as an example, the fourth SCI can use polarization coding. During mapping, in the time domain, mapping can begin from the OFDM symbol occupied by the first DMRS of the PSSCH (which can be understood as the time / frequency resource used to transmit the periodic service). This is equivalent to the fourth SCI and DMRS sharing time domain resources. However, in the frequency domain, the DMRS is mapped every other subcarrier, so the fourth SCI can occupy subcarriers not occupied by the DMRS. Because DMRS is used for channel estimation, the second UE can receive the PSSCH based on the channel estimation result. The closer the distance to the DMRS, the more accurate the channel estimation result and the more accurate the decoding. Therefore, this mapping method can ensure transmission reliability. Alternatively, the fourth configuration information may also be included in RRC signaling or MAC CE.

[0092] You can refer to it again Figure 6A 、 Figure 6B 、 Figure 7 or Figure 8 In these figures, the squares with horizontal lines indicate that the fourth SCI is sent. It can be seen that these figures all take the example of sending the fourth SCI at the first time associated with the transmission time of the first resource used for sending the first periodic service in each period.

[0093] S405. The second UE sends a response message to the first UE. Correspondingly, the first UE receives the response message from the second UE. The response message may be, for example, a positive acknowledgement (ACK) or a negative acknowledgement (NACK). Optionally, if the first UE does not receive the response message, subsequent steps may not be performed and the process ends. Alternatively, the process may return to S401, S402, or S403.

[0094] The response information is, for example, feedback on whether the first configuration information included in the first SCI is effective, ineffective, or no longer effective. For example, if the first SCI or the second SCI indicates that the first configuration information included in the first SCI is effective, ineffective, or no longer effective through the included SPS indication, then it can be understood that the response information is feedback on the SPS indication. If the second SCI indicates that the first configuration information included in the first SCI is effective, ineffective, or no longer effective, the second UE can send the response information to the first UE after receiving the second SCI. Alternatively, if the first SCI indicates that the first configuration information included in the first SCI is effective, ineffective, or no longer effective, the second UE can send the response information to the first UE after receiving the second SCI, or the second UE can also send the response information to the first UE after receiving the first SCI. That is, S405 may occur before S403, or after S403, or simultaneously with S403.

[0095] S406: The first UE sends a first periodically transmitted transport block to the second UE. Correspondingly, the second UE receives the first periodically transmitted transport block from the first UE.

[0096] For the second UE, if the first SCI is not detected during the first time corresponding to a certain transmission, the second UE can determine the resources of the transmission time based on the second configuration information included in the first SCI previously received, and thus detect the data of the first periodic transmission during the transmission time. For this, please refer to the previous description.

[0097] Alternatively, if the first SCI is detected at a first time corresponding to a certain transmission, the second UE may determine the resources of the transmission time according to the second configuration information included in the first SCI, thereby detecting the data of the first periodic transmission at the transmission time.

[0098] In addition, if the first UE sends the fourth configuration information, the second UE can also determine the number of transmission blocks included in each transmission of all or part of the first periodic transmission based on the fourth configuration information, and / or determine the location of the resources occupied by the corresponding transmission blocks, thereby detecting the transmission blocks. For this, please refer to the previous introduction.

[0099] S407: The second UE sends feedback information to the first UE. Correspondingly, the first UE receives feedback information from the second UE.

[0100] For example, if the second UE successfully receives a certain transport block, it may feedback an ACK for the transport block, and if it fails to receive (or decode) a certain transport block, it may feedback a NACK for the transport block. ACK / NACK is sent, for example, via a physical sidelink feedback channel (PSFCH). Figure 6A 、 Figure 6B 、 Figure 7 or Figure 8 The black box in the figure represents the PSFCH. The arrow corresponding to the black box points to a resource used to send periodic services, indicating that the transmission block sent on the resource has failed to be received, or in other words, the PSFCH corresponds to the transmission block.

[0101] If the feedback information is NACK, S408 can be executed, and if the feedback information is ACK, S408 does not need to be executed and the process ends.

[0102] S408: The first UE retransmits the second transport block. Correspondingly, the second UE receives the retransmitted second transport block from the first UE.

[0103] For example, if the second UE fails to receive the second transmission block and sends a NACK to the first UE, the first UE may retransmit the second transmission block. Alternatively, if the first UE also sends the first SCI at the first time associated with the transmission time of the initial transmission of the second transmission block, and / or also sends the second SCI at the second time associated with the transmission time of the initial transmission of the second transmission block, and the second UE fails to receive or decode the first SCI and / or the second SCI, then the first UE may also fail to receive the second transmission block, and the first UE may also retransmit the first SCI and / or the second SCI and / or the second transmission block. Since whether a transmission block needs to be retransmitted depends on whether the transmission block has been correctly received by the second UE, the first UE cannot determine in advance whether retransmission is required or how many times it needs to be retransmitted, and therefore cannot determine in advance how many resources need to be reserved for retransmission. Therefore, in an embodiment of the present application, the resources configured in each first period under the first configuration can be used for the initial transmission of the transmission block. If a transmission block needs to be retransmitted, the first UE can dynamically select the resources for retransmission based on the feedback information of the second UE.

[0104] For the second UE, the PSCCH can be monitored within the first time duration after the time domain resource unit corresponding to the PSFCH of the second transport block. The PSCCH is associated with the retransmitted second transport block. For example, the PSCCH can schedule the retransmitted second transport block. Therefore, the second UE can achieve blind detection of the retransmitted second transport block by monitoring the PSCCH. For example, the range of the first time duration is [T now +T min , T now +T max ]. Among them, T now Indicates the time slot where the PSFCH corresponding to the second transport block is located. min and / or T max It can be determined by the second UE itself, for example, the second UE determines it according to the capability of the second UE. Or, T min and / or T max It can also be configured by the first UE, the first UE can set T min and / or T max Send to the second UE. Or, T min and / or T max It can also be configured by network equipment, which can min and / or T max Sent to the first UE and the second UE. Or, T min and / or T max It can also be predefined through protocols, etc.

[0105] Among them, S401 and S404 to S408 are all optional steps.

[0106] In an embodiment of the present application, for example, a first periodic service (or, referred to as a first periodic transmission) includes M transmissions, and the M transmissions may correspond to P second times, and the second time may be used to send a second SCI. The first terminal device may send the second SCI at N second times, without having to send the second SCI at all P second times. That is, the first terminal device does not need to send SCI (the first SCI and / or the second SCI) at each time corresponding to the first periodic service. This reduces the process of decoding the SCI for the second terminal device, thereby reducing the power consumption of the second terminal device. Moreover, since the number of SCIs sent by the first terminal device is reduced, the transmission overhead can also be reduced.

[0107] Figure 9 A schematic diagram of the structure of a communication device provided in an embodiment of the present application is given. The communication device 900 may be Figure 4 The first UE or the circuit system of the first UE described in the embodiment shown is used to implement the method corresponding to the first UE in the above method embodiment. For specific functions, please refer to the description in the above method embodiment. Alternatively, the communication device 900 can be Figure 4 The second UE or the circuit system of the second UE described in the embodiment shown is used to implement the method corresponding to the second UE in the above method embodiment. For specific functions, please refer to the description of the above method embodiment. Among them, for example, one circuit system is a chip system.

[0108] Communication device 900 includes one or more processors 901. Processor 901, also known as a processing unit, can implement certain control functions. Processor 901 can be a general-purpose processor or a dedicated processor. For example, it includes a baseband processor and a central processing unit. The baseband processor can be used to process communication protocols and communication data. The central processing unit can be used to control communication device 900, execute software programs, and / or process data. Different processors can be independent devices or provided in one or more processing circuits, for example, integrated into one or more application-specific integrated circuits.

[0109] Optionally, the communication device 900 includes one or more memories 902 for storing instructions 904. The instructions 904 can be executed on the processor, causing the communication device 900 to perform the method described in the above method embodiment. Optionally, the memory 902 can also store data. The processor and memory can be provided separately or integrated together.

[0110] Optionally, the communication device 900 may include instructions 903 (sometimes also referred to as codes or programs), which may be executed on the processor to enable the communication device 900 to perform the methods described in the above embodiments. The processor 901 may store data.

[0111] Optionally, the communication device 900 may further include a transceiver 905 and an antenna 906. The transceiver 905 may be referred to as a transceiver unit, a transceiver, a transceiver circuit, a transceiver, an input / output interface, etc., and is configured to implement the transceiver function of the communication device 900 through the antenna 906.

[0112] Optionally, the communication device 900 may further include one or more of the following components: a wireless communication module, an audio module, an external memory interface, an internal memory, a universal serial bus (USB) interface, a power management module, an antenna, a speaker, a microphone, an input / output module, a sensor module, a motor, a camera, or a display screen, etc. It will be appreciated that in some embodiments, the communication device 900 may include more or fewer components, or some components may be integrated or separated. These components may be implemented in hardware, software, or a combination of software and hardware.

[0113] The processor 901 and transceiver 905 described in the embodiments of the present application may be implemented on an integrated circuit (IC), an analog IC, a radio frequency identification (RFID) integrated circuit, a mixed-signal IC, an application specific integrated circuit (ASIC), a printed circuit board (PCB), or an electronic device. The communication device described herein may be a standalone device (e.g., a standalone integrated circuit, a mobile phone, etc.), or may be part of a larger device (e.g., a module that can be embedded in another device). For details, please refer to the aforementioned description of the terminal device and the network device, which will not be repeated here.

[0114] The embodiment of the present application provides a terminal device, which can be used in the above embodiments. The terminal device includes a terminal device for implementing Figure 4 The corresponding means (means), unit and / or circuit of the first UE function described in the embodiment shown, or the terminal device includes a means for implementing Figure 4 The corresponding means, units and / or circuits of the second UE function described in the embodiment shown are, for example, a terminal device including a transceiver module to support the terminal device to implement the transceiver function, and a processing module to support the terminal device to process signals.

[0115] Figure 10 A schematic structural diagram of a terminal device provided in an embodiment of the present application is given.

[0116] The terminal device 1000 can be applied to Figure 3A or Figure 3B For ease of illustration, Figure 10 Only the main components of the terminal device 1000 are shown. Figure 10 As shown, terminal device 1000 includes a processor, memory, control circuitry, an antenna, and input / output devices. The processor is primarily used to process communication protocols and communication data, as well as control the entire terminal device 1000, execute software programs, and process software program data. The memory is primarily used to store software programs and data. The control circuitry is primarily used to convert baseband signals into radio frequency signals and process radio frequency signals. The antenna is primarily used to transmit and receive radio frequency signals in the form of electromagnetic waves. Input / output devices, such as a touch screen, display, microphone, and keyboard, are primarily used to receive user input and output data to the user.

[0117] Those skilled in the art will understand that for ease of explanation, Figure 10Only one memory and processor are shown. In some embodiments, the terminal device 1000 may include multiple processors and memories. The memory may also be referred to as a storage medium or a storage device, etc., which is not limited in the present embodiment.

[0118] In one example, the antenna and control circuit with transceiver functions can be regarded as the transceiver unit 1010 of the terminal device 1000, and the processor with processing function can be regarded as the processing unit 1020 of the terminal device 1000. Figure 10 As shown, terminal device 1000 includes a transceiver unit 1010 and a processing unit 1020. The transceiver unit may also be referred to as a transceiver, transceiver, transceiver device, etc. Optionally, the device in transceiver unit 1010 that implements the receiving function may be considered a receiving unit, and the device in transceiver unit 1010 that implements the transmitting function may be considered a transmitting unit, that is, transceiver unit 1010 includes a receiving unit and a transmitting unit. For example, the receiving unit may also be referred to as a receiver, receiver, receiving circuit, etc., and the transmitting unit may be referred to as a transmitter, transmitter, or transmitting circuit, etc.

[0119] Those skilled in the art will appreciate that the units and steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0120] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is merely a logical functional division. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0121] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned computer-readable storage medium can be any available medium that can be accessed by a computer. By way of example and not limitation, computer-readable media may include random access memory (RAM), read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM), universal serial bus flash disk, mobile hard disk, or other optical disk storage, magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and can be accessed by a computer. In addition, by way of example and not limitation, many forms of RAM are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), or direct rambus RAM (DR RAM).

[0122] Embodiment 1. A communication method, applicable to a first terminal device, comprising:

[0123] Sending first sidelink control information SCI at N first times, where the first SCI is used to indicate first configuration information, where the first configuration information includes: resources for a first periodic transmission, where the resources for the first periodic transmission include time domain resources and / or frequency domain resources, where the first periodic transmission includes M transmissions, where the transmission period of the first periodic transmission is a first period, and where the M transmissions correspond to P transmission times, where N is an integer greater than or equal to 1, M is an integer less than or equal to P, and P is an integer greater than N;

[0124] A second SCI associated with the first SCI is sent at N second times, and the first SCI sent at the N first times and the second SCI sent at the N second times are used to schedule the M transmissions.

[0125] Embodiment 2. According to the method of embodiment 1, the first SCI or the second SCI is also used to indicate an index of the first periodic transmission.

[0126] Embodiment 3. According to the method of embodiment 1 or 2, the first SCI or the second SCI is also used to indicate HARQ information of the first periodic transmission.

[0127] Example 4. The method according to any one of Examples 1 to 3, further comprising:

[0128] Send fifth configuration information, where the fifth configuration information is used to configure the index of the first periodic transmission and / or the HARQ information.

[0129] Embodiment 5. According to the method described in any one of Embodiments 1 to 4, the first SCI or the second SCI is used to indicate that the first configuration information is effective, no longer effective, or not effective.

[0130] Embodiment 6: According to the method of any one of Embodiments 1 to 5, the second SCI further indicates a source address and a destination address associated with the first periodic transmission service.

[0131] Example 7. The method according to any one of Examples 1 to 6,

[0132] The i-th second time among the N second times is the time for sending one transmission block of the M transmissions, where i is any integer from 0 to N-1; or,

[0133] There is a first time offset between the i-th second time among the N second times and the sending time of the most recent transmission block, i is any integer from 0 to N-1, the sending time of the most recent transmission block is after the i-th second time, and the transmission block belongs to one of the M transmissions.

[0134] Example 8. The method according to any one of Examples 1 to 7,

[0135] The first time and the second time are the same; or,

[0136] There is a second time offset between the i-th first time and the i-th second time, and the second time offset is indicated by the first SCI or is predefined or preconfigured.

[0137] Example 9. The method according to any one of Examples 1 to 8, further comprising:

[0138] sending a third SCI at K first times, the K first times being associated with K transport blocks in the M transmissions, the third SCI being used to indicate second configuration information, the K transport blocks being transport blocks other than N transport blocks in the M transmissions, and the j-th transport block among the N transport blocks being a transport block occurring at the j-th second time among the N second times in the M transmissions, or a transport block most recently after the j-th second time among the N second times;

[0139] The second configuration information is identical to all or part of the information included in the first configuration information indicated by the first SCI sent most recently before sending the third SCI, and K is a positive integer less than or equal to PN.

[0140] Example 10. The method according to Example 9, further comprising:

[0141] The second SCI associated with the third SCI is not sent.

[0142] Example 11. The method according to any one of Examples 1 to 10, further comprising:

[0143] The second SCI is not sent at PN second times, the PN second times are associated with PN transport blocks other than N transport blocks in the M transmissions, and the j-th transport block among the N transport blocks is the transport block occurring at the j-th second time among the N second times in the M transmissions, or the transport block closest to after the j-th second time among the N second times.

[0144] Example 12. The method according to Example 11, further comprising:

[0145] The first transmission block of the periodic transmission is sent on a first resource, where the first transmission block is one of the PN transmission blocks, the first resource includes time domain resources and / or frequency domain resources, and the first resource is determined based on the first SCI most recent before the first resource.

[0146] Embodiment 13. According to the method according to any one of embodiments 1 to 12, the first SCI is further used to indicate whether to send a second SCI associated with the first SCI.

[0147] Example 14. The method according to any one of Examples 1 to 13, further comprising:

[0148] Send third configuration information, where the third configuration information is used to configure a second period, where the second period is a period for the receiving end of the first periodic transmission to detect the first SCI, and the second period is greater than or equal to the first period.

[0149] Embodiment 15. A communication method, applicable to a second terminal device, comprising:

[0150] detecting first sidelink control information SCI at N first times, where the first SCI is used to indicate first configuration information, where the first configuration information includes: resources for a first periodic transmission, where the resources for the first periodic transmission include time domain resources and / or frequency domain resources, where the first periodic transmission includes M transmissions, where a transmission period of the first periodic transmission is a first period, and where the M transmissions correspond to P transmission times, where N is an integer greater than or equal to 1, M is an integer less than or equal to P, and P is an integer greater than N;

[0151] A second SCI associated with the first SCI is detected at N second times, and the first SCI sent at the N first times and the second SCI sent at the N second times are used to schedule the M transmissions.

[0152] Embodiment 16: According to the method of embodiment 15, the first SCI or the second SCI is further used to indicate an index of the first periodic transmission.

[0153] Embodiment 17. According to the method of embodiment 16, the first SCI or the second SCI is also used to indicate HARQ information of the first periodic transmission.

[0154] Example 18. The method according to Example 16 or 17, further comprising:

[0155] Fifth configuration information is received, where the fifth configuration information is used to configure an index of the first periodic transmission and / or the HARQ information.

[0156] Embodiment 19. According to the method described in any one of Embodiments 15 to 18, the first SCI or the second SCI is used to indicate that the first configuration information is effective, no longer effective, or not effective.

[0157] Embodiment 20: According to the method according to any one of embodiments 15 to 19, the second SCI further indicates a source address and a destination address associated with the first periodic transmission service.

[0158] Example 21. The method according to any one of Examples 15 to 20,

[0159] The i-th second time among the N second times is the time for sending one transmission block of the M transmissions, where i is any integer from 0 to N-1; or,

[0160] There is a first time offset between the i-th second time among the N second times and the sending time of the most recent transmission block, i is any integer from 0 to N-1, the sending time of the most recent transmission block is after the i-th second time, and the transmission block belongs to one of the M transmissions.

[0161] Example 22. The method according to any one of Examples 15 to 21,

[0162] The first time and the second time are the same; or,

[0163] There is a second time offset between the i-th first time and the i-th second time, and the second time offset is indicated by the first SCI or is predefined or preconfigured.

[0164] Example 23. The method according to any one of Examples 15 to 22, further comprising:

[0165] not detecting a third SCI at K first times, the K first times being associated with K transport blocks in the M transmissions, the third SCI being used to indicate second configuration information, the K transport blocks being transport blocks other than N transport blocks in the M transmissions, and the j-th transport block among the N transport blocks being a transport block occurring at a j-th second time among the N second times in the M transmissions, or a transport block most recently after the j-th second time among the N second times;

[0166] The second configuration information is identical to all or part of the information included in the first configuration information indicated by the first SCI sent most recently before sending the third SCI, and K is a positive integer less than or equal to PN.

[0167] Example 24. The method according to any one of Examples 15 to 23, further comprising:

[0168] A second SCI associated with the third SCI is not detected.

[0169] Example 25. The method according to any one of Examples 15 to 24, further comprising:

[0170] The second SCI is not detected at PN second times, the PN second times are associated with PN transport blocks other than N transport blocks in the M transmissions, and the j-th transport block among the N transport blocks is a transport block occurring at the j-th second time among the N second times in the M transmissions, or a transport block closest to after the j-th second time among the N second times.

[0171] Example 26. The method according to any one of Examples 15 to 25, further comprising:

[0172] The first transmission block of the periodic transmission is detected on a first resource, where the first transmission block is one of the PN transmission blocks, the first resource includes time domain resources and / or frequency domain resources, and the first resource is determined based on the first SCI most recent before the first resource.

[0173] Embodiment 27. According to the method described in any one of Embodiments 15 to 26, the first SCI is further used to indicate whether to send a second SCI associated with the first SCI.

[0174] Example 28. The method according to any one of Examples 15 to 27, further comprising:

[0175] Receive third configuration information, where the third configuration information is used to configure a second period, where the second period is a period for a receiving end of the first periodic transmission to detect the first SCI, and the second period is greater than or equal to the first period.

[0176] Embodiment 29. A communication device, comprising a processing unit and a transceiver unit, wherein:

[0177] The processing unit is configured to send a first SCI at N first times through the transceiver unit, where the first SCI is used to indicate first configuration information, where the first configuration information includes: resources for a first periodic transmission, where the resources for the first periodic transmission include time domain resources and / or frequency domain resources, where the first periodic transmission includes M transmissions, where the transmission period of the first periodic transmission is a first period, and where the M transmissions correspond to P transmission times, where N is an integer greater than or equal to 1, M is an integer less than or equal to P, and P is an integer greater than N;

[0178] The processing unit is further configured to send a second SCI associated with the first SCI at N second times through the transceiver unit at N moments, and the first SCI sent at the N first times and the second SCI sent at the N second times are used to schedule the M transmissions.

[0179] Embodiment 30: The communication device according to embodiment 29, wherein the first SCI or the second SCI is further used to indicate an index of the first periodic transmission.

[0180] Embodiment 31. In the communication device according to embodiment 29 or 30, the first SCI or the second SCI is further used to indicate HARQ information of the first periodic transmission.

[0181] Embodiment 32. According to the communication device according to any one of embodiments 29 to 31, the processing unit is further used to send fifth configuration information through the transceiver unit, and the fifth configuration information is used to configure the index of the first periodic transmission and / or the HARQ information.

[0182] Embodiment 33. In the communication device according to any one of embodiments 29 to 32, the first SCI or the second SCI is used to indicate that the first configuration information is effective or no longer effective or is not effective.

[0183] Embodiment 34. According to the communication device of any one of Embodiments 29 to 33, the second SCI further indicates a source address and a destination address associated with the first periodic transmission service.

[0184] Embodiment 35. The communication device according to any one of embodiments 29 to 34,

[0185] The i-th second time among the N second times is the time for sending one transmission block of the M transmissions, where i is any integer from 0 to N-1; or,

[0186] There is a first time offset between the i-th second time among the N second times and the sending time of the most recent transmission block, i is any integer from 0 to N-1, the sending time of the most recent transmission block is after the i-th second time, and the transmission block belongs to one of the M transmissions.

[0187] Embodiment 36. The communication device according to any one of embodiments 29 to 35,

[0188] The first time and the second time are the same; or,

[0189] There is a second time offset between the i-th first time and the i-th second time, and the second time offset is indicated by the first SCI or is predefined or preconfigured.

[0190] Embodiment 37. The communication device according to any one of Embodiments 29 to 36, wherein the processing unit is further configured to send a third SCI through the transceiver unit at K first times, the K first times being associated with K transport blocks in the M transmissions, the third SCI being used to indicate second configuration information, the K transport blocks being transport blocks other than N transport blocks in the M transmissions, the j-th transport block in the N transport blocks being a transport block occurring at the j-th second time among the N second times in the M transmissions, or a transport block most recently after the j-th second time among the N second times;

[0191] The second configuration information is identical to all or part of the information included in the first configuration information indicated by the first SCI sent most recently before sending the third SCI, and K is a positive integer less than or equal to PN.

[0192] Embodiment 38. According to the communication device of embodiment 37, the processing unit is further configured to send the second SCI associated with the third SCI without sending it through the transceiver unit.

[0193] Embodiment 39. According to the communication device according to any one of Embodiments 29 to 38, the processing unit is further used to not send the second SCI at PN second times, the PN second times are associated with PN transmission blocks other than N transmission blocks in the M transmissions, and the j-th transmission block in the N transmission blocks is the transmission block that occurs at the j-th second time in the N second times in the M transmissions, or the transmission block most recently after the j-th second time in the N second times.

[0194] Embodiment 40. According to the communication device according to any one of Embodiments 29 to 39, the processing unit is further used to send the first transmission block of the periodic transmission on the first resource through the transceiver unit, the first transmission block is one of the PN transmission blocks, the first resource includes time domain resources and / or frequency domain resources, and the first resource is determined based on the first SCI most recent before the first resource.

[0195] Embodiment 41. According to the communication device of any one of Embodiments 29 to 40, the first SCI is further used to indicate whether to send a second SCI associated with the first SCI.

[0196] Example 42. According to the communication device according to any one of Examples 29 to 41, the processing unit is further used to send third configuration information through the transceiver unit, and the third configuration information is used to configure a second period, the second period is a period for the receiving end of the first periodic transmission to detect the first SCI, and the second period is greater than or equal to the first period.

[0197] Embodiment 43. A communication device, comprising a processing unit and a transceiver unit, wherein:

[0198] The processing unit is configured to detect first sideline control information SCI through the transceiver unit at N first times, where the first SCI is used to indicate first configuration information, where the first configuration information includes: resources for a first periodic transmission, where the resources for the first periodic transmission include time domain resources and / or frequency domain resources, where the first periodic transmission includes M transmissions, where the transmission period of the first periodic transmission is a first period, and where the M transmissions correspond to P transmission times, where N is an integer greater than or equal to 1, M is an integer less than or equal to P, and P is an integer greater than N;

[0199] The processing unit is further configured to detect a second SCI associated with the first SCI through the transceiver unit at N second times, and the first SCI sent at the N first times and the second SCI sent at the N second times are used to schedule the M transmissions.

[0200] Embodiment 44. According to the communication device of embodiment 43, the first SCI or the second SCI is also used to indicate the index of the first periodic transmission.

[0201] Embodiment 45. In the communication device according to embodiment 44, the first SCI or the second SCI is further used to indicate HARQ information of the first periodic transmission.

[0202] Embodiment 46. According to the communication device of embodiment 44 or 45, the processing unit is further used to receive fifth configuration information through the transceiver unit, and the fifth configuration information is used to configure the index of the first periodic transmission and / or the HARQ information.

[0203] Embodiment 47. In the communication device according to any one of embodiments 43 to 46, the first SCI or the second SCI is used to indicate that the first configuration information is effective or no longer effective or is not effective.

[0204] Embodiment 48. According to the communication device of any one of Embodiments 43 to 47, the second SCI further indicates a source address and a destination address associated with the first periodic transmission service.

[0205] Embodiment 49. The communication device according to any one of embodiments 43 to 48,

[0206] The i-th second time among the N second times is the time for sending one transmission block of the M transmissions, where i is any integer from 0 to N-1; or,

[0207] There is a first time offset between the i-th second time among the N second times and the sending time of the most recent transmission block, i is any integer from 0 to N-1, the sending time of the most recent transmission block is after the i-th second time, and the transmission block belongs to one of the M transmissions.

[0208] Embodiment 50. The communication device according to any one of embodiments 43 to 49,

[0209] The first time and the second time are the same; or,

[0210] There is a second time offset between the i-th first time and the i-th second time, and the second time offset is indicated by the first SCI or is predefined or preconfigured.

[0211] Embodiment 51. The communication device according to any one of Embodiments 43 to 50, wherein the processing unit is further configured to not detect a third SCI through the transceiver unit at K first times, the K first times being associated with K transport blocks in the M transmissions, the third SCI being used to indicate second configuration information, the K transport blocks being transport blocks other than N transport blocks in the M transmissions, and the j-th transport block among the N transport blocks being a transport block occurring at the j-th second time among the N second times in the M transmissions, or a transport block most recently after the j-th second time among the N second times;

[0212] The second configuration information is identical to all or part of the information included in the first configuration information indicated by the first SCI sent most recently before sending the third SCI, and K is a positive integer less than or equal to PN.

[0213] Embodiment 52. According to the communication device of any one of Embodiments 43 to 51, the processing unit is further configured to detect the second SCI associated with the third SCI without using the transceiver unit.

[0214] Embodiment 53. According to the communication device according to any one of Embodiments 43 to 52, the processing unit is further used to not detect the second SCI at PN second times, the PN second times are associated with PN transmission blocks other than N transmission blocks in the M transmissions, and the j-th transmission block in the N transmission blocks is the transmission block occurring at the j-th second time in the N second times in the M transmissions, or the transmission block most recently after the j-th second time in the N second times.

[0215] Example 54. According to the communication device according to any one of Examples 43 to 53, the processing unit is further used to detect the first transmission block of the periodic transmission on the first resource through the transceiver unit, the first transmission block is one of the PN transmission blocks, the first resource includes time domain resources and / or frequency domain resources, and the first resource is determined based on the first SCI most recent before the first resource.

[0216] Embodiment 55. In the communication device according to any one of embodiments 43 to 54, the first SCI is further used to indicate whether to send a second SCI associated with the first SCI.

[0217] Example 56. According to the communication device according to any one of Examples 43 to 55, the processing unit is further used to receive third configuration information through the transceiver unit, and the third configuration information is used to configure a second period, the second period is a period for the receiving end of the periodic service to detect the first SCI, and the second period is greater than or equal to the first period.

[0218] Embodiment 57. A device comprising a unit for performing the method described in any embodiment of the present application.

[0219] Embodiment 58. A computer program product, comprising a computer program, which, when run on a computer, enables the computer to execute the method described in any one of Embodiments 1 to 14, or enables the computer to execute the method described in any one of Embodiments 15 to 28.

Claims

1. A communication method, characterized in that: Applied to a first terminal device, the method includes: Sending first sidelink control information SCI at N first times, where the first SCI is used to indicate first configuration information, the first configuration information indicates resources for a first periodic transmission, the resources for the first periodic transmission include time domain resources and / or frequency domain resources, the first periodic transmission includes M transmissions, a transmission period of the first periodic transmission is a first period, and the M transmissions correspond to P transmission times, where N is an integer greater than or equal to 1, M is an integer less than or equal to P, and P is an integer greater than N; A second SCI associated with the first SCI is sent at N second times, and the first SCI sent at the N first times and the second SCI sent at the N second times are used to schedule the M transmissions.

2. The method according to claim 1, characterized in that The first SCI or the second SCI is further used to indicate an index of the first periodic transmission.

3. The method according to claim 2, characterized in that The first SCI or the second SCI is further used to indicate HARQ information of the first periodic transmission.

4. The method according to any one of claims 1 to 3, characterized in that The first SCI or the second SCI is used to indicate that the first configuration information is valid, no longer valid, or not valid.

5. The method according to any one of claims 1 to 3, characterized in that The second SCI further indicates a source address and a destination address associated with the first periodic transmission service.

6. The method according to any one of claims 1 to 3, characterized in that The i-th second time among the N second times is the time for sending one transmission block of the M transmissions, where i is any integer from 0 to N-1; or, There is a first time offset between the i-th second time among the N second times and the sending time of the most recent transmission block, i is any integer from 0 to N-1, the sending time of the most recent transmission block is after the i-th second time, and the transmission block belongs to one of the M transmissions.

7. The method according to any one of claims 1 to 3, characterized in that The first time and the second time are the same; or, There is a second time offset between the i-th first time and the i-th second time, and the second time offset is indicated by the first SCI or is predefined or preconfigured.

8. The method according to any one of claims 1 to 3, characterized in that The method further comprises: sending a third SCI at K first times, the K first times being associated with K transport blocks in the M transmissions, the third SCI being used to indicate second configuration information, the K transport blocks being transport blocks other than N transport blocks in the M transmissions, and the j-th transport block among the N transport blocks being a transport block occurring at the j-th second time among the N second times in the M transmissions, or a transport block most recently after the j-th second time among the N second times; The second configuration information is identical to all or part of the information included in the first configuration information indicated by the first SCI sent most recently before sending the third SCI, and K is a positive integer less than or equal to PN.

9. The method according to claim 8, characterized in that The method further comprises: The second SCI associated with the third SCI is not sent.

10. The method according to any one of claims 1 to 3 and 9, characterized in that: The method further comprises: The second SCI is not sent at PN second times, the PN second times are associated with PN transport blocks other than N transport blocks in the M transmissions, and the j-th transport block among the N transport blocks is the transport block occurring at the j-th second time among the N second times in the M transmissions, or the transport block closest to after the j-th second time among the N second times.

11. The method according to claim 10, characterized in that The method further comprises: The first transmission block of the periodic transmission is sent on a first resource, where the first transmission block is one of the PN transmission blocks, the first resource includes time domain resources and / or frequency domain resources, and the first resource is determined based on the first SCI most recent before the first resource.

12. The method according to any one of claims 1 to 3, 9 and 11, characterized in that: The first SCI is further used to indicate whether to send a second SCI associated with the first SCI.

13. The method according to any one of claims 1 to 3, 9 and 11, characterized in that: The method further comprises: Send third configuration information, where the third configuration information is used to configure a second period, where the second period is a period for the receiving end of the first periodic transmission to detect the first SCI, and the second period is greater than or equal to the first period.

14. The method according to any one of claims 1 to 3, 9 and 11, characterized in that: The method further comprises: Fourth configuration information is sent, where the fourth configuration information is used to indicate the number of transmission blocks included in each transmission of the first periodic transmission and / or the resources of the first periodic transmission occupied by the transmission blocks included in each transmission.

15. A communication method, characterized in that: include: detecting first sidelink control information SCI at N first times, where the first SCI is used to indicate first configuration information, the first configuration information indicates resources for a first periodic transmission, the resources for the first periodic transmission include time domain resources and / or frequency domain resources, the first periodic transmission includes M transmissions, a transmission period of the first periodic transmission is a first period, the M transmissions correspond to P transmission times, where N is an integer greater than or equal to 1, M is an integer less than or equal to P, and P is an integer greater than N; A second SCI associated with the first SCI is detected at N second times, and the first SCI sent at the N first times and the second SCI sent at the N second times are used to schedule the M transmissions.

16. The method according to claim 15, characterized in that The first SCI or the second SCI is further used to indicate an index of the first periodic transmission.

17. The method according to claim 16, characterized in that The first SCI or the second SCI is further used to indicate HARQ information of the first periodic transmission.

18. The method according to any one of claims 15 to 17, characterized in that: The first SCI or the second SCI is used to indicate that the first configuration information is valid, no longer valid, or not valid.

19. The method according to any one of claims 15 to 17, characterized in that: The second SCI further indicates a source address and a destination address associated with the first periodic transmission service.

20. The method according to any one of claims 15 to 17, characterized in that: The i-th second time among the N second times is the time for sending one transmission block of the M transmissions, where i is any integer from 0 to N-1; or, There is a first time offset between the i-th second time among the N second times and the sending time of the most recent transmission block, i is any integer from 0 to N-1, the sending time of the most recent transmission block is after the i-th second time, and the transmission block belongs to one of the M transmissions.

21. The method according to any one of claims 15 to 17, characterized in that The first time and the second time are the same; or, There is a second time offset between the i-th first time and the i-th second time, and the second time offset is indicated by the first SCI or is predefined or preconfigured.

22. The method according to any one of claims 15 to 17, characterized in that The method further comprises: not detecting a third SCI at K first times, the K first times being associated with K transport blocks in the M transmissions, the third SCI being used to indicate second configuration information, the K transport blocks being transport blocks other than N transport blocks in the M transmissions, and the j-th transport block among the N transport blocks being a transport block occurring at a j-th second time among the N second times in the M transmissions, or a transport block most recently after the j-th second time among the N second times; The second configuration information is identical to all or part of the information included in the first configuration information indicated by the first SCI sent most recently before sending the third SCI, and K is a positive integer less than or equal to PN.

23. The method according to claim 22, characterized in that The method further comprises: A second SCI associated with the third SCI is not detected.

24. The method according to any one of claims 15 to 17 and 23, characterized in that The method further comprises: The second SCI is not detected at PN second times, the PN second times are associated with PN transport blocks other than N transport blocks in the M transmissions, and the j-th transport block among the N transport blocks is a transport block occurring at the j-th second time among the N second times in the M transmissions, or a transport block closest to after the j-th second time among the N second times.

25. The method according to claim 24, characterized in that The method further comprises: The first transmission block of the periodic transmission is detected on a first resource, where the first transmission block is one of the PN transmission blocks, the first resource includes time domain resources and / or frequency domain resources, and the first resource is determined based on the first SCI most recent before the first resource.

26. The method according to any one of claims 15 to 17, 23 and 25, characterized in that: The first SCI is further used to indicate whether to send a second SCI associated with the first SCI.

27. The method according to any one of claims 15 to 17, 23 and 25, characterized in that The method further comprises: Receive third configuration information, where the third configuration information is used to configure a second period, where the second period is a period for a receiving end of the first periodic transmission to detect the first SCI, and the second period is greater than or equal to the first period.

28. The method according to any one of claims 15 to 17, 23 and 25, characterized in that The method further comprises: Fourth configuration information is received, where the fourth configuration information is used to indicate the number of transport blocks included in each transmission of the first periodic transmission and / or the resources of the first periodic transmission occupied by the transport blocks included in each transmission.

29. A communication device, characterized in that: include: one or more processors; one or more memories; and one or more computer programs, wherein the one or more computer programs are stored in the one or more memories, and the one or more computer programs include instructions that, when executed by one or more processors of the communication device, cause the communication device to perform the method according to any one of claims 1 to 14, or cause the communication device to perform the method according to any one of claims 15 to 28.

30. A computer-readable storage medium, characterized in that The computer-readable storage medium is used to store a computer program, which, when executed on a computer, enables the computer to execute the method according to any one of claims 1 to 14, or enables the computer to execute the method according to any one of claims 15 to 28.

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