Communication method and communication apparatus

Abstract

Provided in the present application are a communication method and a communication apparatus. In the communication method provided in the present application, when first SCI is sent, on a first resource of a first resource pool, to indicate a first RS, which is sent on a second resource of a second resource pool, the first resource is located in a first time slot of the first resource pool in the time domain, a frequency domain of the first resource pool is located in a first frequency band, the second resource is located in a second time slot of the second resource pool in the time domain, a frequency domain of the second resource pool is located in a second frequency band, and the first resource pool and the second resource pool have not exactly the same physical time slots, wherein the second time slot is the Kth time slot after a third time slot in the second resource pool, and a physical time slot number of the third slot in the second frequency band is not located prior to a physical time slot number of a time slot corresponding to the first time slot in the second frequency band at the same moment.

Description

Communication method and communication device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on August 25, 2023, with application number 202311086873.4 and application name “Communication Method and Communication Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of communications, and in particular to a communication method and a communication device. Background Art

[0003] In sidelink (SL) communication scenarios, terminals can use the time-frequency resources in the SL for perception. For example, the terminal uses the time-frequency resources in the SL to send a reference signal (also called a perception signal). By receiving the echo of the perception signal and comparing it with the transmitted perception signal, the terminal can perceive information such as the distance and speed of the target object.

[0004] In order to prevent different terminals from conflicting when selecting time-frequency resources for sending perception signals, in the existing SL protocol, the terminal needs to indicate the time-frequency resources selected for sending perception signals through sidelink control information (SCI), so that other terminals can select unselected time-frequency resources when selecting time-frequency resources, which also facilitates the receiving terminal to receive the perception signal.

[0005] Considering the requirements for perception resolution, since the FR2 band can provide a larger bandwidth, it is very likely that the FR2 band will be configured for perception signals in the future. However, the bandwidth required to send SCI is not necessarily large. Therefore, when configuring perception signals in the FR2 band, how to use SCI to indicate the perception signals sent in the FR2 band has become a technical problem that needs to be solved urgently.

[0006] Summary of the Invention

[0007] The present application provides a communication method and a communication device, in order to solve the problem of indicating a perception signal sent on the FR2 frequency band through SCI.

[0008] In a first aspect, the present application provides a communication method, comprising: determining a first resource for sending a first SCI, the first SCI being used to indicate a second resource used by a scheduled first RS; sending a first SCI on the first resource; wherein the first resource is located in a first time slot of a first resource pool in the time domain, the frequency domain of the first resource pool is located in a first frequency band, the second resource is located in a second time slot of a second resource pool in the time domain, the frequency domain resources of the second resource pool are located in a second frequency band, the first resource pool and the second resource pool have different physical time slots; and the second time slot is the Kth time slot after the third time slot in the second resource pool, and the physical time slot number of the third time slot in the second frequency band is not before the physical time slot number of the time slot corresponding to the first time slot in the second frequency band at the same time.

[0009] The communication method provided in this embodiment may be executed by a terminal that sends the first RS, also referred to as a sending end in this embodiment.

[0010] In this embodiment, the transmitting end sends a first SCI on a first resource in a first resource pool to indicate a second resource in a scheduled second resource pool for sending a first RS. The first resource pool belongs to a first frequency band in the frequency domain, and the second resource pool belongs to a second frequency band in the frequency domain. It should be understood that the resources in this application include time domain resources and frequency domain resources. In other words, in this embodiment, the transmitting end sends a first SCI via a first frequency band to indicate a second resource occupied by a first RS sent on a second frequency band. The first frequency band and the second frequency band have different physical time slots.

[0011] Exemplarily, the first frequency band is the FR1 frequency band, and the second frequency band is the FR2 frequency band.

[0012] Specifically, in this embodiment, when the transmitting end sends the first SCI through the first frequency band to indicate the second resource occupied by the first RS sent on the second frequency band, the time slot to which the first resource belongs in the time domain (also called the first time slot) and the time slot to which the second resource belongs in the time domain (also called the second time slot) satisfy the following relationship: the second time slot is the Kth time slot after the third time slot in the second resource pool, and the physical time slot number of the third time slot in the second frequency band is not before the physical time slot number of the time slot corresponding to the first time slot in the second frequency band at the same time.

[0013] The second time slot being the Kth time slot after the third time slot in the second resource pool can be understood as follows: the second time slot and the third time slot are both time slots included in the second resource pool that can send RSs, the difference between the logical time slot number corresponding to the second time slot in the second resource pool and the logical time slot number corresponding to the third time slot in the second resource pool is K, and the second time slot is located after the third time slot. For the third time slot, it is necessary to satisfy the requirement that the physical time slot number in the second frequency band is not located before the physical time slot number of the time slot corresponding to the first time slot in the second frequency band at the same time.

[0014] That is, from the perspective of the second resource pool, in the second resource pool, the second time slot is the Kth time slot after the third time slot. Therefore, in this application, it can be considered that K represents the offset of the logical time slot numbers corresponding to the two time slots in the second resource pool. For the convenience of description, the offset of the logical time slot numbers corresponding to the two time slots is referred to as the logical time slot offset.

[0015] There are several ways to implement it:

[0016] Method 1: Assuming that the logical time slot number of the first time slot used to send the first SCI in the first resource pool is n', and the physical time slot number corresponding to the first frequency band is n, then according to the relationship between the subcarrier spacing between the first frequency band and the second frequency band, the physical time slot number of the time slot corresponding to the first time slot of the first frequency band in the second frequency band (for example, called the first target time slot) at the same time is obtained. u RS and u SCI Respectively represent the subcarrier spacing configuration parameters of the first frequency band and the second frequency band; then, the first target time slot is converted to the third time slot located in the RS resource pool (that is, the third time slot is determined by the first target time slot). The third time slot and the second time slot satisfy the following relationship: the logical time slot number of the second time slot in the second resource pool (denoted as K') RS ) is the sum of the logical time slot number of the third time slot and the logical time slot offset K. The process can be expressed as:

[0017] in, Indicates that the physical time slots are numbered The logical time slot number of the third time slot after the first target time slot is converted.

[0018] In this way, when the time slot corresponding to the first time slot in the second frequency band (i.e., the first target time slot) is located in the second resource pool, the third time slot is the time slot corresponding to the first time slot in the second frequency band; if the first target time slot is not located in the second resource pool, the third time slot is determined to be the time slot in the second resource pool that is closest to the time slot corresponding to the first time slot in the second frequency band.

[0019] It should be understood that based on the first approach, it can be ensured that the first RS will not be sent before the first SCI, and invalid indication will not occur.

[0020] Method 2: Considering that the receiving end receiving the first SCI needs a certain amount of time to decode the first SCI, if the receiving end is to avoid missing the first RS, the receiving end needs to receive the first RS while decoding the first SCI, resulting in a large power consumption of the receiving end. Therefore, in order to save the power consumption of the receiving end, based on method 1, a first time length is reserved between the first time slot used to send the first SCI and the second time slot where the scheduled RS is located. The first time length is related to the decoding time length of the first SCI and / or the time length of opening the RS receiving link. For example, the first time length is expressed as T proc1 , T proc1 Corresponding to Y time slots in the second frequency band, at this time, Updated to:

[0021] in, Indicates that the physical time slots in the second frequency band are numbered The logical time slot number of the time slot (ie, the third time slot) after the time slot (also called the fourth time slot) is converted.

[0022] In the second mode, if the physical time slot number in the second frequency band is The fourth time slot is located in the second resource pool. At this time, the fourth time slot can be determined as the third time slot, that is, the third time slot is the Yth time slot after the time slot corresponding to the first time slot in the second frequency band; or, if the fourth time slot is not in the second resource pool, at this time, the third time slot is the time slot in the second resource pool that is located after the fourth time slot and is closest to the fourth time slot, and the fourth time slot is the Yth time slot after the time slot corresponding to the first time slot in the second frequency band.

[0023] Optionally, the first duration may be obtained in at least one of the following ways: 1) configured, for example, by a receiving end receiving the first SCI to a transmitting end sending the first SCI. 2) configured by a higher layer of the terminal sending the first SCI; the higher layer here refers to a high layer, including layers above the physical layer. 3) predefined by a protocol.

[0024] In combination with the first aspect, in one implementation, each time slot in the first resource pool is only used to transmit SCI, and each time slot in the second resource pool is only used to transmit RS; wherein, each time slot in the first resource pool can schedule one or more time slots in the second resource pool.

[0025] In combination with the first aspect, in one implementation, the time slots included in the first resource pool are determined based on a first bit map, the time slots included in the second resource pool are determined based on a second bit map, the second bit map is determined according to the first bit map, each time slot in the first resource pool is associated with Z time slots in the second resource pool and the Z time slots associated with different time slots in the first resource pool do not overlap with each other, the time moment of each time slot in the first resource pool is not after the earliest time slot among the associated Z time slots, and Z is a positive integer; wherein, when the first SCI is sent on the first resource, the first time slot is associated with the second time slot.

[0026] In this implementation, by establishing an association relationship between the time slots included in the first resource pool and the second resource pool, and then allowing the transmitting end to select the time slot associated with the second time slot as the first time slot when sending the first SCI, the problem of having an available time slot for sending RS but no time slot for scheduling the SCI of the RS can be avoided. By ensuring that the time moment of each time slot in the first resource pool is not after the earliest time slot among the associated Z time slots, that is, ensuring that the SCI sent by each time slot in the first resource pool will not be sent before the scheduled RS, the problem of delayed indication can be avoided.

[0027] As an example, Z is less than or equal to the ratio of the subcarrier spacing of the second frequency band to the subcarrier spacing of the first frequency band.

[0028] In combination with the second aspect, in one possible implementation, the time interval between the moment of each time slot in the first resource pool and the earliest time slot among the associated Z time slots is greater than a second duration, and the second duration is related to the decoding duration of the first SCI and / or the duration of opening the RS receiving link.

[0029] This implementation method can save power consumption at the receiving end.

[0030] Optionally, the second duration is P time slots in the second frequency band, where P is a positive integer.

[0031] With reference to the first aspect, in a possible implementation, the Z time slots associated with each time slot in the first resource pool are Z adjacent time slots on the second frequency band.

[0032] For example, in one embodiment, the length of the first bitmap is L1, the length of the second bitmap is ML1, and M is the ratio of the subcarrier spacing of the second frequency band to the subcarrier spacing of the first frequency band; wherein, when the i-th bit of the first bitmap is 1, the j-th bit of the second bitmap is 1, and j and i satisfy: j = (Mi + z + P) mod ML1, z = 0, 1, ..., Z-1.

[0033] In combination with the first aspect, in a possible implementation manner, the number of SCI resources included in each time slot in the first resource pool is the same as the total number of RS resources included in the associated Z time slots.

[0034] Optionally, the number of RS resources included in each of the Z time slots associated with each time slot in the first resource pool is the ratio of the number of SCI resources included in each time slot in the first resource pool to Z.

[0035] It should be noted that in this embodiment, when the first SCI indicates the second resource for sending the first RS in the second time slot of the scheduled second resource pool, there is no limitation on how to specifically indicate the second resource in the second time slot. For example, it can be a purely dynamic indication, a purely pre-configured indication, or a combination of dynamic and pre-configured indications.

[0036] For example, in one implementation, the first SCI is used to indicate the second resource used by the transmitted reference signal RS, including: the first SCI carries first information, the first information indicates the second resource, and the first information carries a parameter for indicating K. Exemplarily, the content indicated by the first information includes at least one of the following: the index of the starting subchannel of the RS and the number of consecutively occupied subchannels, the index of the symbol group occupied by the RS in a time slot, the index of the comb tooth occupied by the RS in a time slot, and the index of the occupied resource pool.

[0037] For example, in yet another implementation, each time slot in the first resource pool is configured to include N1 resource subgroups, each time slot in the second resource pool is configured to include N1 RS resources, and the SCI sent on the n1th resource subgroup in the N1 resource subgroups indicates the n1th RS resource in the N1 RS resources;

[0038] The first SCI is used to indicate the second resource used by the scheduled first reference signal RS, including: indicating the second resource by the position of the first resource used by the first SCI within the first time slot.

[0039] In the second aspect, the present application provides a communication method, including: receiving a first SCI on a first resource, the first SCI is used to indicate a second resource used by a first RS, the first resource is located in the first time slot of the first resource pool in the time domain, the frequency domain of the first resource pool is located in the first frequency band, the second resource is located in the second time slot of the second resource pool in the time domain, the frequency domain resources of the second resource pool are located in the second frequency band, and the first resource pool and the second resource pool have different physical time slots; receiving a first RS on the second resource based on the indication of the first SCI; wherein the second time slot is the Kth time slot after the third time slot in the second resource pool, and the physical time slot number of the third time slot in the second frequency band is not before the physical time slot number of the time slot corresponding to the first time slot in the second frequency band at the same time.

[0040] This implementation may be performed by a device that receives the first RS, also referred to as a receiving end.

[0041] In combination with the second aspect, in one implementation, when the time slot corresponding to the first time slot in the second frequency band is located in the second resource pool, the third time slot is the time slot corresponding to the first time slot in the second frequency band; or, when the time slot corresponding to the first time slot in the second frequency band is not located in the second resource pool, the third time slot is the time slot in the second resource pool that is closest to the time slot corresponding to the first time slot in the second frequency band.

[0042] In combination with the second aspect, in one implementation, the third time slot is the Yth time slot after the time slot corresponding to the first time slot in the second frequency band; or, the third time slot is the time slot in the second resource pool that is located after the fourth time slot and is closest to the fourth time slot, and the fourth time slot is the Yth time slot after the time slot corresponding to the first time slot in the second frequency band; wherein Y is determined based on the first duration, and the first duration is related to the decoding duration of the first SCI and / or the duration of opening the RS receiving link.

[0043] In combination with the second aspect, in one implementation, each time slot in the first resource pool is only used to transmit SCI, and each time slot in the second resource pool is only used to transmit RS; wherein, each time slot in the first resource pool can schedule one or more time slots in the second resource pool.

[0044] In combination with the second aspect, in one implementation, the time slots included in the first resource pool are determined based on a first bit map, the time slots included in the second resource pool are determined based on a second bit map, the second bit map is determined according to the first bit map, each time slot in the first resource pool is associated with Z time slots in the second resource pool and the Z time slots associated with different time slots in the first resource pool do not overlap with each other, the time moment of each time slot in the first resource pool is not after the earliest time slot among the associated Z time slots, and Z is a positive integer; wherein, when the first SCI is received on the first resource, the first time slot is associated with the second time slot.

[0045] In combination with the second aspect, in one implementation, Z is less than or equal to a ratio of a subcarrier spacing of the second frequency band to a subcarrier spacing of the first frequency band.

[0046] In combination with the second aspect, in one implementation, the time interval between the moment of each time slot in the first resource pool and the earliest time slot among the associated Z time slots is greater than a second duration, and the second duration is related to the decoding duration of the first SCI and / or the duration of opening the RS receiving link.

[0047] In combination with the second aspect, in one implementation, the second duration is P time slots in the second frequency band, where P is a positive integer.

[0048] In conjunction with the second aspect, in one implementation, the Z time slots associated with each time slot in the first resource pool are Z adjacent time slots in the second frequency band. For example, in one embodiment, the length of the first bitmap is L1, the length of the second bitmap is ML1, and M is the ratio of the subcarrier spacing of the second frequency band to the subcarrier spacing of the first frequency band; wherein, when the i-th bit of the first bitmap is 1, the j-th bit of the second bitmap is 1, and j and i satisfy: j = (Mi + z + P) mod ML1, z = 0, 1, ..., Z-1.

[0049] In combination with the second aspect, in one implementation, the number of SCI resources included in each time slot in the first resource pool is the same as the total number of RS resources included in the associated Z time slots.

[0050] In combination with the second aspect, in one implementation, the number of RS resources included in each of the Z time slots associated with each time slot in the first resource pool is the ratio of the number of SCI resources included in each time slot in the first resource pool to Z.

[0051] In combination with the second aspect, in one implementation, the first SCI carries first information, the first information indicates the second resource, and the first information includes a parameter for indicating K; when receiving the first RS on the second resource, it also includes: determining the second resource based on the first information.

[0052] In combination with the second aspect, in one implementation, when receiving the first RS on the second resource, it includes: determining the second resource based on the position of the first resource used by the first SCI within the first time slot.

[0053] In a third aspect, the present application provides a communication method, comprising:

[0054] Sending a first SCI on a first resource, where the first SCI is used to indicate a second resource used by a scheduled first RS, where the first resource is located in a first resource pool, the second resource is located in a second resource pool, the first resource pool is located in a first frequency band in the frequency domain, and the second resource pool is located in a second frequency band in the frequency domain;

[0055] The time slots included in the first resource pool are determined based on the first bitmap, the time slots included in the second resource pool are determined based on the second bitmap, the second bitmap is determined according to the first bitmap, each time slot in the first resource pool is associated with Z time slots in the second resource pool, and the Z time slots associated with different time slots in the first resource pool do not overlap with each other, and the time at which each time slot in the first resource pool is located is not after the earliest time slot among the associated Z time slots, and Z is a positive integer;

[0056] When the first SCI is sent on the first resource, the first time slot to which the first resource belongs in the time domain is a time slot associated with the second time slot to which the second resource belongs in the time domain.

[0057] In a fourth aspect, the present application provides a communication method, comprising:

[0058] Receiving a first SCI on a first resource, where the first SCI is used to indicate a second resource used by the first RS, where the first resource is located in a first resource pool, the second resource is located in a second resource pool, the first resource pool is located in a first frequency band in the frequency domain, and the second resource pool is located in a second frequency band in the frequency domain;

[0059] The time slots included in the first resource pool are determined based on the first bitmap, the time slots included in the second resource pool are determined based on the second bitmap, the second bitmap is determined according to the first bitmap, each time slot in the first resource pool is associated with Z time slots in the second resource pool, and the Z time slots associated with different time slots in the first resource pool do not overlap with each other, and the time at which each time slot in the first resource pool is located is not after the earliest time slot among the associated Z time slots, and Z is a positive integer;

[0060] The first time slot to which the first resource belongs in the time domain is a time slot associated with the second time slot to which the second resource belongs in the time domain.

[0061] In a fifth aspect, the present application provides a communication device, comprising: a memory configured to execute the method as described in the first aspect or any possible implementation thereof.

[0062] In combination with the fifth aspect, in one possible implementation, the communication device also includes a processor; the memory is used to store program instructions; and the processor is used to call the program instructions in the memory to execute the method described in the first aspect or any possible implementation thereof.

[0063] In a sixth aspect, the present application provides a communication device, comprising: a memory configured to execute the method described in the second aspect or any possible implementation thereof.

[0064] In combination with the fourth aspect, in one possible implementation, the communication device also includes a processor; the memory is used to store program instructions; and the processor is used to call the program instructions in the memory to execute the method described in the second aspect or any possible implementation thereof.

[0065] In a seventh aspect, the present application provides a communication device, comprising: a memory configured to execute the method described in the third aspect.

[0066] In combination with the seventh aspect, in one possible implementation, the communication device also includes a processor; the memory is used to store program instructions; and the processor is used to call the program instructions in the memory to execute the method described in the first aspect or any possible implementation thereof.

[0067] In an eighth aspect, the present application provides a communication device, comprising: a memory configured to execute the method described in the fourth aspect.

[0068] In combination with the eighth aspect, in a possible implementation, the communication device also includes a processor; the memory is used to store program instructions; and the processor is used to call the program instructions in the memory to execute the method described in the fourth aspect.

[0069] In a ninth aspect, the present application provides a communication system comprising the communication device as described in the fifth aspect and the communication device as described in the sixth aspect; or, comprising the communication device as described in the seventh aspect and the communication device as described in the eighth aspect.

[0070] In a tenth aspect, the present application provides a computer-readable medium storing a program code for computer execution, the program code including instructions for executing the method as described in any one of the first to fourth aspects or any possible implementation thereof.

[0071] In the eleventh aspect, the present application provides a chip system comprising at least one processor and a communication interface, the communication interface and the at least one processor being interconnected by lines, and the at least one processor being used to run computer programs or instructions to perform the method as described in the first to fourth aspects or any possible implementation thereof.

[0072] In the twelfth aspect, the present application provides a computer program product, which includes a computer program code. When the computer program code is run on a computer, the computer implements the method described in any one of the first to fourth aspects or any possible implementation thereof.

[0073] Among them, the technical effects brought about by any implementation method from the second aspect to the twelfth aspect can be referred to the technical effects brought about by the above-mentioned first aspect and any possible implementation method therein, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] FIG1 is a schematic diagram of a communication scenario of an application provided by this application;

[0075] FIG2 is another schematic diagram of a communication scenario of an application provided by this application;

[0076] FIG3 is a schematic diagram of a time slot structure for locating a resource pool;

[0077] FIG4 is a schematic diagram of transmitting SCI in the FR2 frequency band;

[0078] FIG5 is a schematic diagram of an invalid indication of SCI provided by the present application;

[0079] FIG6 is a schematic diagram of an SCI hysteresis indication provided by the present application;

[0080] FIG7 is a flow chart of a communication method provided by the present application;

[0081] 8 and 9 are schematic diagrams of a time slot indicated by an SCI provided in the present application;

[0082] FIG10 is a schematic diagram of another SCI indicated resource provided by this application;

[0083] 11 to 15 are schematic diagrams of another time slot indicated by SCI provided in the present application;

[0084] FIG16 is a schematic diagram of a resource indicated by an SCI provided by this application;

[0085] FIG17 is a schematic diagram of a resource indicated by an SCI provided by this application;

[0086] FIG18 is a structural diagram of a communication device provided by the present application;

[0087] FIG19 is a structural diagram of another communication device provided in this application. DETAILED DESCRIPTION

[0088] To facilitate understanding of the embodiments of the present application, a communication scenario applicable to the embodiments of the present application is first introduced in detail with reference to Figures 1 and 2.

[0089] In order to support direct communication between terminals, a sidelink (SL) communication scenario is introduced, and terminals can communicate with each other through the PC5 interface. Figure 1 is a schematic diagram of a communication scenario applicable to an embodiment of the present application. In the communication scenario shown in Figure 1, terminal 110 and terminal 120 can communicate through wireless communication technology. Among them, the communication link between terminal 110 and terminal 120 can be called a sidelink or other names; the air interface for direct communication between terminal 110 and terminal 120 is called PC5 or other names, and the embodiment of the present application does not limit this.

[0090] The terminal in the embodiments of the present application may also be referred to as: user equipment (UE), mobile station (MS), mobile terminal (MT), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication equipment, user agent or user device, etc.

[0091] Exemplarily, the terminal may be a device that provides voice / data connectivity to a user, such as a handheld device or a vehicle-mounted device with a wireless connection function. At present, some examples of terminals are: mobile phones, tablet computers, laptop computers, PDAs, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices, terminals in 5G networks or future evolved public land mobile communication networks (PLMNs). The embodiment of the present application does not limit this.

[0092] By way of example and not limitation, in this application, a terminal may be a terminal in an Internet of Things (IoT) system. The IoT is an important component of the future development of information technology. Its main technical feature is connecting objects to the Internet through communication technologies, thereby realizing an intelligent network that interconnects humans and machines, and objects and things. For example, the terminal in the embodiments of this application may be a wearable device. Wearable devices, also known as wearable smart devices, are a general term for wearable devices that apply wearable technology to intelligently design and develop wearable devices, such as glasses, gloves, watches, clothing, and shoes. Wearable devices are portable devices that can be worn directly on the body or integrated into the user's clothing or accessories. Wearable devices are not just hardware devices; they can also achieve powerful functions through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include those that are fully functional, large in size, and can achieve full or partial functions independently of a smartphone, such as smart watches or smart glasses, as well as those that focus on a specific application function and require cooperation with other devices such as smartphones, such as various smart bracelets and smart jewelry for vital sign monitoring.

[0093] As an example and not a limitation, in an embodiment of the present application, the terminal may also be a terminal in machine type communication (MTC). In addition, the terminal may also be an on-board module, on-board module, on-board component, on-board chip or on-board unit built into the vehicle as one or more components or units, and the vehicle may implement the method provided in the present application through the built-in on-board module, on-board module, on-board component, on-board chip or on-board unit. Therefore, the embodiment of the present application may also be applied to the Internet of Vehicles, such as vehicle to everything (V2X), long term evolution-vehicle (LTE-V), vehicle-to-vehicle (V2V) technology, etc.

[0094] As an example and not a limitation, in an embodiment of the present application, the terminal may also be a terminal in machine type communication (MTC). In addition, the terminal may also be an on-board module, on-board module, on-board component, on-board chip or on-board unit built into the vehicle as one or more components or units, and the vehicle may implement the method provided in the present application through the built-in on-board module, on-board module, on-board component, on-board chip or on-board unit. Therefore, the embodiment of the present application may also be applied to the Internet of Vehicles, such as vehicle to everything (V2X), long term evolution-vehicle (LTE-V), vehicle-to-vehicle (V2V) technology, etc.

[0095] It should be understood that Figure 1 is a simplified schematic diagram shown only for ease of understanding. In other possible scenarios, the communication scenario may also include other devices that are not shown in Figure 1. For example, the scenario shown in Figure 1 may also include a network device. When a network device is included in the scenario shown in Figure 1, as shown in Figure 2, terminal 110 and terminal 120 may both be within the coverage of the network device (as shown in (a) and (b) in Figure 2); or, terminal 110 and terminal 120 may have one terminal within the coverage of network device 110 and one terminal not within the coverage of network device 110 (as shown in (c) in Figure 2). Alternatively, both terminal 110 and terminal 120 are not within the coverage of the network device (as shown in (d) in Figure 2).

[0096] It should be noted that in the scenarios shown in (a), (b) and (c) in Figure 2, the terminal 110 is located within the network coverage of the network device, then the terminal 110 can communicate with the terminal 120 by scheduling resources by the network device. Such resources scheduled by the network device can be called authorized resources or authorized frequency bands; alternatively, the terminal 110 and the terminal 120 can communicate without adopting the network device scheduling mode. For example, the terminal 110 can select resources, that is, select resources for sidelink communication from the resource pool. Such resources can be called unauthorized resources or unauthorized frequency bands, thereby communicating with the terminal 120. In the scenario shown in (d) in Figure 2, the terminal 110 and the terminal 120 are both outside the network coverage of the network device, then the terminal 110 and the terminal 120 cannot communicate with each other by scheduling resources by the network device, and the terminals need to communicate with each other by self-selecting resources. Among them, the resources in this application refer to time-frequency resources.

[0097] It should be understood that the network device in the scenario shown in Figure 2 can be a device that communicates with the terminal. The network device can also be called an access network device or a wireless access network device. It can be a transmission reception point (TRP), an evolved network device (evolved NodeB, eNB or eNodeB) in the LTE system, a home network device (for example, home evolved NodeB, or home Node B, HNB), a baseband unit (BBU), or a wireless controller in a cloud radio access network (CRAN) scenario, or the network device can be a relay station, an access point, a vehicle-mounted device, a wearable device, a network device in a 5G network, or a network device in a future evolved PLMN network, etc. It can also be an access point (AP) in a WLAN, or a gNB in ​​an NR system. The above-mentioned network devices can also be urban network devices, micro network devices, pico network devices, femto network devices, etc., and this application does not limit this.

[0098] In a network structure, the network device may include a centralized unit (CU) node, a distributed unit (DU) node, a radio access network (RAN) device including a CU node and a DU node, or a RAN device including a control plane CU node (CU-CP node) and a user plane CU node (CU-UP node) and a DU node.

[0099] In the SL communication scenarios shown in Figures 1 and 2, in order to support integrated communication and perception, the terminal can use the time and frequency resources in the SL for perception.

[0100] For example, a self-transmitting and self-receiving terminal can use the time-frequency resources in the SL to send a reference signal (RS) for perception, also known as a perception signal, and then receive the echo of the perception signal and compare it with the transmitted perception signal to perceive the distance, speed, and other information of the target object (e.g., a person, obstacle, etc.). Alternatively, perception can be performed between terminals by sending a perception signal and receiving the perception signal. In this application, for ease of description, the reference signal used for perception is also referred to as a perception signal.

[0101] In order to prevent conflicts between different terminals when selecting time-frequency resources, a well-defined resource indication method needs to be defined. For example, in the existing SL communication protocol, the sidelink control information (SCI) transmitted via the physical sidelink control channel (PSCCH) indicates the time-frequency resources (also called perception resources, RS resources, or resources) occupied by the terminal for transmitting the perception signal, so that other terminals can select the unselected time-frequency resources when selecting time-frequency resources, which also facilitates the receiving terminal to receive the perception signal.

[0102] In this application, the time-frequency resources occupied by the terminal include the time-frequency resources already occupied by the terminal and the time-frequency resources reserved by the terminal to be occupied in the future, wherein the time-frequency resources reserved by the terminal to be occupied in the future are also called reserved time-frequency resources.

[0103] Or from another perspective, the terminal needs to obtain the SCI information of other terminals through SCI to obtain the time-frequency resources occupied by other UEs, and then when selecting resources, select resources not occupied by other UEs to avoid resource selection conflicts.

[0104] In the existing SL communication scenario, when the SCI is used to indicate the time-frequency resources occupied by the terminal, the SCI (or also called the PSCCH carrying the SCI) and the perception signal (or called data, or called the PSSCH carrying data) are time-division multiplexed in the same time slot.

[0105] Exemplarily, in SL positioning, a time slot structure of a resource pool dedicated to positioning is shown in Figure 3. The PSCCH and the side positioning reference signal (PRS) occupy different symbols in a time slot (i.e., the PSCCH and the side PRS are time-division multiplexed). Considering that a plurality of PRS resources (including time domain resources and frequency domain resources) for sending PRS included in a time slot can be multiplexed by different terminals in a time division, frequency division, and comb division manner, multiple PSCCH candidate positions can also be configured on the PSCCH symbol. Different PSCCH candidate positions can be occupied by different terminals that select different PRS resources. The SCI sent at different PSCCH candidate positions indicates the PRS resources occupied by the terminal.

[0106] In the current discussion of SL positioning, the bandwidth occupied by PRS is not too large, for example, not more than 100MHz. However, in the perception service, the perception resolution (or also called ranging resolution) is proportional to the bandwidth used by the sent perception signal. The relationship between the two is ΔR is the ranging resolution, c is the speed of light, and B is the signal bandwidth.

[0107] Therefore, compared to communication services, sensing services require a larger bandwidth. For example, to achieve a ranging resolution of 0.1 meters to distinguish multiple targets, the sensing signal bandwidth requires at least 1.5 GHz. Since the FR2 band has relatively abundant spectrum resources and can provide the bandwidth required for larger sensing signals, it is very likely that a large-bandwidth resource pool will be deployed in the FR2 band in the future for transmitting sensing signals. However, the bandwidth required to transmit SCI does not necessarily need to be very large. In this case, if the PSCCH and sensing signals continue to be time-division multiplexed within the same timeslot, it will result in significant resource waste.

[0108] For example, as shown in FIG4 , considering that there are 12 RS resources in a time slot (for example, 3 symbol groups, each symbol group uses 4 comb teeth), each RS resource can be used to transmit RS, then 12 PSCCH candidate positions are required in a time slot, assuming that 1 PSCCH occupies 25 physical resource blocks (PRBs) (the maximum number of PRBs that can be occupied by PSCCH specified in the SL communication protocol). In the 100MHz FR1 frequency band (subcarrier spacing is 30kHz), the bandwidth occupied by PSCCH is approximately 100MHz, which can be almost consistent with the bandwidth of PRS. Time division multiplexing of PSCCH and PRS in the same time slot will not cause resource waste. However, in the 1.5GHz FR2 frequency band (subcarrier spacing is 120kHz), the bandwidth occupied by PSCCH is approximately 430MHz. If PSCCH and PRS continue to use time division multiplexing within the time slot, it will cause more serious resource waste.

[0109] To avoid wasting resources, one approach is to frequency-division multiplex SCI and RS, decoupling the SCI bandwidth from the RS bandwidth. Furthermore, when a terminal autonomously selects RS resources using mode 2 resource allocation, it needs to decode the SCI sent by other terminals. However, FR2 has large path loss and beam misalignment, resulting in poor SCI decoding performance. Furthermore, frequency-division multiplexing of SCI and RS in the FR2 band reduces the available bandwidth for RS in the FR2 band and reduces ranging resolution. Therefore, SCI can be sent in the FR1 band to indicate the time-frequency resources occupied by the RS sent in the FR2 band. In this way, the terminal device can deploy only a simple sequence processing module in the FR2 band, eliminating the need for complex communication modules such as decoding and demodulation.

[0110] However, because the FR1 and FR2 bands have different subcarrier spacings, the time slot numbers of the two bands are not uniform, making it impossible for the SCI to directly indicate the RS resources within the current time slot as shown in Figure 3. Therefore, how to send the SCI in the FR1 band to indicate the RS resources selected by the terminal for RS transmission in the FR2 band across carriers has become a pressing technical problem.

[0111] Currently, one cross-carrier indication method is TS 38.214, which specifies how to use downlink control information (DCI) to indicate the physical downlink shared channel (PDSCH) across carriers. The physical time slot numbers of the time slot where the DCI is located and the time slot where the scheduled PDSCH is located satisfy the formula:

[0112] Where b represents the physical timeslot number of the timeslot where the DCI is located, K s Indicates the physical time slot number of the time slot where the allocated PDSCH is located. K0 represents the offset of the time slot determined by DCI, which is determined based on the parameter set (numerology) of PDSCH. μPDSCH and μPDCCH represent the subcarrier spacing configuration parameters of PDSCH and PDCCH respectively. The subcarrier spacing can be expressed as Δf=2 u *15kHz.

[0113] However, not all time slots can be used for SL transmission. SL introduces the configuration of resource pools, which limit the time and frequency resources used for SL transmission. Time slots belonging to the resource pool configured for SL transmission can be renumbered to form corresponding logical time slot numbers. Therefore, the cross-carrier time slot indication formula in NR cannot be directly applied, which may result in invalid indication.

[0114] For example, if the resource pool configured for transmitting SCI is called an SCI resource pool, the resource pool configured for transmitting RS is called an RS resource pool. The subcarrier spacing adopted by the FR1 frequency band where the SCI resource pool is located is 30kHz, and the subcarrier spacing adopted by the FR2 frequency band where the RS resource pool is located is 120kHz. As shown in FIG5 , the configured SCI resource pool includes the time slot with a physical time slot number of 0 (referred to as physical time slot 0), the time slot with a physical time slot number of 4 (referred to as physical time slot 4), and the time slot with a physical time slot number of 7 (referred to as physical time slot 7) in the FR1 frequency band, and the configured RS resource pool includes the time slot with a physical time slot number of 0 (referred to as physical time slot 0), the time slot with a physical time slot number of 3 (referred to as physical time slot 3), the time slot with a physical time slot number of 6 (referred to as physical time slot 7) in the FR2 frequency band. The following are physical time slots: physical time slot 6, physical time slot 10 (referred to as physical time slot 10), physical time slot 13 (referred to as physical time slot 13), physical time slot 16 (referred to as physical time slot 16), physical time slot 20 (referred to as physical time slot 20), physical time slot 23 (referred to as physical time slot 23), physical time slot 26 (referred to as physical time slot 26), physical time slot 30 (referred to as physical time slot 30), physical time slot 33 (referred to as physical time slot 33), and physical time slot 36 (referred to as physical time slot 36). The value range of K0 is set to 0 to 3. The time slots included in the SCI resource pool and RS resource pool can be renumbered to form the logical time slot numbers corresponding to each time slot. That is, physical slots 0, 4, and 7 in the SCI resource pool correspond to logical slot numbers 0, 1, and 2, respectively. Physical slots 0, 3, 6, 10, 13, 16, 20, 23, 26, 30, 33, and 36 in the RS resource pool correspond to logical slot numbers 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, and 11, respectively. Assuming that the SCI is transmitted on physical slot 4 in the FR1 frequency band and K0 = 0, the RS resource indicated by the SCI is located in physical slot 16 in the FR2 frequency band. This physical slot 16 belongs to the RS resource pool, and the indication is valid. However, if K0 is 1 / 2 / 3, then the RS resources indicated by the SCI should be located in the physical time slots 17 / 18 / 19 of the FR2 frequency band. These time slots do not belong to the RS resource pool, making the indication invalid. For example, the dotted lines in Figure 3 represent invalid indications.

[0115] On the other hand, if the logical time slot number is directly used to replace the physical time slot number in the above formula, it may cause the time slot where the RS resource indicated by the SCI is located to be ahead of the time where the SCI time slot is located in physical time.

[0116] For example, as shown in Figure 6, if the SCI is transmitted on the time slot with a logical time slot number of 1 (the time slot with a physical time slot number of 4), K0 = 0, then according to the above formula, the time slot where the RS resource indicated by the SCI is located is located in the time slot with a logical time slot number of 4 (the time slot with a physical time slot number of 13) in the FR2 frequency band, that is, the RS is sent before the SCI, and the SCI indicates a lag. In this case, the receiving end may miss receiving the RS, or the receiving end is required to have a larger cache, resulting in higher receiving power consumption.

[0117] In view of this, the present application provides a method for sending SCI in the FR1 frequency band to indicate RS resources selected for sending RS in the FR2 frequency band across carriers.

[0118] Before introducing the communication method of the present application, it should be emphasized that although the present application is based on the perspective of sending SCI on FR1 to indicate RS sent on FR2 frequency band, the communication method is also applicable to cross-resource pool scheduling in all SL scenarios (for example, including SL communication / SL positioning / SL perception). The so-called cross-resource pool scheduling refers to the scheduling of a signal sent on one resource pool to send another signal on a resource in another resource pool, wherein the two resource pools have different physical time slots.

[0119] The description of the extension to other SL scenarios can be compared to the implementation method of sending SCI from FR1 to indicate RS sent on the FR2 frequency band in this application, and will not be repeated here.

[0120] In conjunction with Figure 7, a schematic diagram of the process of the communication method provided by this application is described. As shown in Figure 7, the method includes:

[0121] S701: A first terminal determines a first time slot for sending a first SCI, where the first SCI is used to indicate a second resource used by a scheduled first RS.

[0122] Among them, the first terminal is the sending end.

[0123] Specifically, in this embodiment, the first resource is located in a first time slot in the time domain. The first time slot is included in a first resource pool. The first resource pool is a resource pool configured for sending SCI. The frequency domain of the first resource pool is located in a first frequency band.

[0124] Specifically, in this embodiment, the second resource is located in a second time slot in the time domain, the second time slot is included in a second resource pool, the second resource pool is a resource pool configured for transmitting RS, and the frequency domain of the second resource pool is located in a second frequency band. The first resource pool and the second resource pool have different physical time slots.

[0125] Optionally, the first frequency band may also be referred to as a first frequency range, and the second frequency band may also be referred to as a second frequency range.

[0126] In one implementation, the first frequency band is the FR1 frequency band, and the second frequency band is the FR2 frequency band.

[0127] In another implementation manner, the first frequency band and the second frequency band may also be understood as two different sub-frequency bands of the FR1 frequency band, or two different sub-frequency bands of the FR2 frequency band.

[0128] For ease of description, in this embodiment, the first resource pool is referred to as an SCI resource pool, and the second resource pool is referred to as an RS resource pool. However, it should be understood that the names herein are merely examples and do not constitute limitations of this application.

[0129] It should be understood that the first terminal needs to indicate to other terminals (referred to as second terminals in this application) the resources (ie, second resources) occupied by the first terminal for sending the first RS by sending the first SCI.

[0130] Optionally, the first reference signal may be a reference signal used for perception, or the first reference signal may be a reference signal used for positioning.

[0131] Exemplarily, the second resources occupied by the first terminal for sending RS, including occupied resources and / or reserved resources, do not constitute a limitation of the present application.

[0132] It should be noted that this embodiment does not limit how the first terminal determines the second resource. For example, it can be a method indicated by a network device, that is, a resource indicated by the network device (also called a scheduled resource); or it can be a method in which the first terminal autonomously selects the resource.

[0133] Specifically, in this embodiment, when the first terminal indicates the second resource used by the first RS to the second terminal through the first SCI, the first terminal needs to determine the time slot used to send the first SCI (referred to as the first time slot in this application) from the SCI resource pool.

[0134] More specifically, in this embodiment, when the first terminal determines the first time slot from the SCI resource pool, the first implementation scheme includes:

[0135] Assuming that the logical time slot number of the first time slot for sending the first SCI in the SCI resource pool is n′, and the physical time slot number corresponding to the first frequency band is n, according to the relationship between the subcarrier spacing between the first frequency band and the second frequency band, at the same time, the physical time slot number of the time slot corresponding to the first time slot of the first frequency band in the second frequency band (also called the first target time slot) is u RS and u SCIRespectively represent the subcarrier spacing configuration parameters of the first frequency band and the second frequency band; then, the first target time slot is converted to the third time slot in the RS resource pool (that is, the third time slot is determined by the first target time slot), wherein the third time slot and the second time slot satisfy the following relationship: the logical time slot number of the second time slot in the RS resource pool (denoted as K′ RS ) is the sum of the logical time slot number of the third time slot and K, where K represents the offset of the logical time slot numbers of the two time slots in the RS resource pool (also called the logical time slot offset). This process can be expressed as the following formula 1:

[0136] in, Indicates that the physical time slots are numbered The logical time slot number of the third time slot after the first target time slot is converted.

[0137] Specifically, in this embodiment, when the first target time slot is converted to the third time slot, the physical time slot number of the converted third time slot in the second frequency band does not precede the physical time slot number of the time slot corresponding to the first time slot in the second frequency band at the same time (i.e., the third time slot does not precede the first target time slot). In implementation, for this first implementation scheme, there are two situations for determining the third time slot:

[0138] 1) If the first target time slot is in the RS resource pool, the third time slot is determined as the first target time slot.

[0139] 2) If the first target time slot is not located in the RS resource pool, then the time slot closest to the first target time slot in the RS resource pool located after the first target time slot is determined as the third time slot after conversion.

[0140] 8 , an example is given where the first target time slot is located in the RS resource pool.

[0141] For example, if the logical time slot number of the first time slot determined by the first terminal in the SCI resource pool is 1, and the physical time slot number corresponding to the first frequency band is 4, then it can be obtained that at the same time, the first time slot of the first frequency band corresponds to the first target time slot with the physical time slot number 16 in the second frequency band. This first target time slot is located in the RS resource pool, so the third time slot is determined as the first target time slot, that is, the time slot with the logical time slot number 5 in the RS resource pool. At this time:

[0142] If K=0, then the time domain of the second resource used by the first RS indicated by the first SCI sent on the time slot with the physical time slot number 4 of the first frequency band is located in the time slot with the physical time slot number 16 of the second frequency band. It can also be understood that the second resource used by the first RS indicated by the first SCI sent on the time slot with the logical time slot number 1 in the SCI resource pool is located in the time slot with the logical time slot number 5 in the RS resource pool;

[0143] If K=1, then the time domain of the second resource used by the first RS indicated by the first SCI sent on the time slot with the physical time slot number 4 of the first frequency band is located in the time slot with the physical time slot number 20 of the second frequency band. It can also be understood that the second resource used by the first RS indicated by the first SCI sent on the time slot with the logical time slot number 1 in the SCI resource pool is located in the time slot with the logical time slot number 6 in the RS resource pool;

[0144] If K=2, then the time domain of the second resource used by the first RS indicated by the first SCI sent on the time slot with the physical time slot number 4 of the first frequency band is located in the time slot with the physical time slot number 23 of the second frequency band. It can also be understood that the second resource used by the first RS indicated by the first SCI sent on the time slot with the logical time slot number 1 in the SCI resource pool is located in the time slot with the logical time slot number 7 in the RS resource pool.

[0145] 8 , an example is given in which the first target time slot is not located in the RS resource pool.

[0146] For example, if the logical time slot number of the first time slot determined by the first terminal in the SCI resource pool is 2, and the physical time slot number corresponding to the first frequency band is 7, then it can be obtained that at the same time, the first time slot of the first frequency band corresponds to the first target time slot of the second frequency band. The first target time slot is not located in the RS resource pool, so the third time slot is determined to be the time slot with the physical time slot number 30 in the RS resource pool that is after the time slot with the physical time slot number 28 and the closest physical time slot number to it, that is, the time slot with the logical time slot number 9 in the RS resource pool. At this time:

[0147] If K=0, then the time domain of the second resource used by the first RS indicated by the first SCI sent on the time slot with the physical time slot number 7 of the first frequency band is located in the time slot with the physical time slot number 30 of the second frequency band. It can also be understood that the second resource used by the first RS indicated by the first SCI sent on the time slot with the logical time slot number 2 in the SCI resource pool is located in the time slot with the logical time slot number 9 in the RS resource pool;

[0148] If K=1, then the time domain of the second resource used by the first RS indicated by the first SCI sent on the time slot with the physical time slot number 7 of the first frequency band is located in the time slot with the physical time slot number 33 of the second frequency band. It can also be understood that the second resource used by the first RS indicated by the first SCI sent on the time slot with the logical time slot number 2 in the SCI resource pool is located in the time slot with the logical time slot number 10 in the RS resource pool;

[0149] If K=2, then the time domain of the second resource used by the first RS indicated by the first SCI sent on the time slot with the physical time slot number 7 of the first frequency band is located in the time slot with the physical time slot number 36 of the second frequency band. It can also be understood that the second resource used by the first RS indicated by the first SCI sent on the time slot with the logical time slot number 2 in the SCI resource pool is located in the time slot with the logical time slot number 11 in the RS resource pool.

[0150] It should be noted that the above is only an example of K=0 / 1 / 2 / 3, and the specific value can be determined according to the situation and does not constitute a limitation of this application.

[0151] Based on the first implementation, it can be ensured that the first RS will not be sent before the first SCI, and invalid indications will not occur. However, the second terminal receiving the first SCI requires a certain amount of time (also called a time gap) to decode the first SCI. To avoid missing the first RS, the second terminal that needs to receive the first SCI must also receive the first RS in the second frequency band while decoding the first SCI, resulting in high receiving power consumption for the second terminal. To this end, a second implementation is proposed in which the first terminal determines the first time slot from the SCI resource pool.

[0152] Specifically, the second implementation scheme in which the first terminal determines the first time slot from the SCI resource pool includes:

[0153] A first duration is reserved in time between the first SCI and the RS scheduled therein, for example, the first duration is represented by T proc1 , the T proc1 Corresponding to Y time slots in the second frequency band, Formula 1 is updated to Formula 2:

[0154] in, Indicates that the physical time slots in the second frequency band are numbered The logical time slot number of the time slot (ie, the third time slot) after the time slot (also called the fourth time slot) is converted.

[0155] Among them, T proc1 It depends on the duration of decoding the first SCI by the second terminal and / or the duration of starting / switching the RS receiving link.

[0156] When implementing, T proc1 The time duration for decoding the first SCI and / or the time duration for enabling / switching the RS reception link may be reported to the first terminal.

[0157] It should be understood that under the second implementation scheme, there are also two situations for determining the third time slot:

[0158] 1) If the physical time slot number in the second frequency band is The fourth time slot is located in the RS resource pool. In this case, the fourth time slot can be determined as the third time slot, that is, the third time slot is the Yth time slot after the time slot corresponding to the second frequency band of the first time slot;

[0159] 2) If the fourth time slot is not in the RS resource pool, then the third time slot is the time slot in the RS resource pool that is located after the fourth time slot and is closest to the fourth time slot, and the fourth time slot is the Yth time slot after the time slot corresponding to the first time slot in the second frequency band.

[0160] 9 , an example is given where the fourth time slot is located in the RS resource pool.

[0161] For example, if the logical time slot number of the first time slot determined by the first terminal in the SCI resource pool is 2, and the corresponding physical time slot number in the first frequency band is 7, then it can be obtained that at the same time, the first target time slot corresponding to the first time slot of the first frequency band in the second frequency band is the time slot with physical time slot number 28. If Y=5, the time slot with physical time slot number 33 (i.e., the fourth time slot) is obtained. The fourth time slot is located in the RS resource pool, so the third time slot is the time slot with logical time slot number 10 in the RS resource pool. At this time: if K=0, then the second resource used by the first RS indicated by the first SCI sent on the time slot with physical time slot number 7 in the first frequency band is located in the time slot with physical time slot number 33 in the second frequency band in the time domain. It can also be understood that the second resource used by the first RS indicated by the first SCI sent on the time slot with logical time slot number 2 in the SCI resource pool is located in the time slot with logical time slot number 10 in the RS resource pool in the time domain.

[0162] In conjunction with FIG9 , an example is given in which the fourth time slot is not located in the RS resource pool.

[0163] For example, if the logical time slot number of the first time slot determined by the first terminal in the SCI resource pool is 0, and the physical time slot number corresponding to the first frequency band is 0, then it can be obtained that at the same time, the first target time slot corresponding to the first time slot of the first frequency band in the second frequency band is the time slot with the physical time slot number 0. If Y=5, the time slot with the physical time slot number 5 (i.e., the fourth time slot) is obtained. The fourth time slot is not located in the RS resource pool. Therefore, the time slot with the physical time slot number 6 in the RS resource pool that is after the time slot with the physical time slot number 5 and closest to the time slot with the physical time slot number 5 is determined as the third time slot. The time slot with the physical time slot number 6 has a logical time slot number of 2 in the RS resource pool. At this time: if K=1, then the second resource of the first RS indicated by the first SCI sent on the time slot with the physical time slot number 0 of the first frequency band is located in the time slot with the physical time slot number 10 of the second frequency band in the time domain. It can also be understood that the second resource used by the first RS indicated by the first SCI sent on the time slot with the logical time slot number 0 in the SCI resource pool is located in the time slot with the logical time slot number 3 in the RS resource pool in the time domain.

[0164] S702: The first terminal sends a first SCI on a first resource; correspondingly, the second terminal receives the first SCI on the first resource.

[0165] S703: The second terminal receives a first RS on a second resource based on an instruction of the first SCI.

[0166] In this embodiment, when the first terminal sends the first SCI on the first resource, the parameter indicating K is carried in the first SCI, so that the second terminal knows the logical time slot offset used when the first terminal indicates the scheduling of the second resource used by the first RS, so that the second terminal can determine the second time slot in the time domain where the second resource used by the first RS indicated by the first SCI is located based on the first time slot where the first SCI is located and K.

[0167] For example, if we do not consider T proc1 After the second terminal learns the first time slot where the first SCI is located and K, it determines the logical time slot number of the second time slot in the RS resource pool based on formula 1 in S701, thereby learning the second time slot where the first RS is located. That is, the second terminal is based on The logical time slot number of the second time slot in the RS resource pool is determined, thereby determining the second time slot.

[0168] Taking Figure 8 as an example, assuming K=0, when the second terminal receives the first SCI sent by the first terminal on the time slot with physical time slot number 7 in the first frequency band, the second terminal obtains that at the same moment, the time slot with physical time slot number 7 corresponds to the time slot with physical time slot number 28 in the second frequency band, and the time slot with physical time slot number 28 is not in the RS resource pool. Therefore, the time slot with physical time slot number 30 in the RS resource pool that is after the time slot with physical time slot number 28 and closest to the time slot with physical time slot number 28 is determined as the third time slot (logical time slot number is 9). Since K=0, the second terminal determines that the time domain of the second resource occupied by the first terminal is located within the time slot with physical time slot number 30.

[0169] For example, if we consider T proc1 After the second terminal learns the physical time slot number and K of the first time slot where the first SCI is located, it determines the logical time slot number of the second time slot in the RS resource pool based on formula 2 in S701, thereby learning the second time slot where the first RS is located. The logical time slot number of the second time slot in the RS resource pool is determined, thereby determining the second time slot.

[0170] For example, taking Figure 9 as an example, assuming K=0, Y=5, when the second terminal receives the first SCI sent by the first terminal in the time slot with physical time slot number 7 in the first frequency band, the second terminal obtains that at the same moment, the time slot with physical time slot number 7 corresponds to the time slot with physical time slot number 28 in the second frequency band, and then obtains the time slot with physical time slot number 33 based on Y=5. The time slot with physical time slot number 33 is located in the RS resource pool and the logical time slot number is 10. Then, since K=0, the second terminal determines that the time domain of the second resource occupied by the first terminal is located in the time slot with physical time slot number 33.

[0171] For another example, taking Figure 9 as an example, assuming K=1, Y=5, when the second terminal receives the first SCI sent by the first terminal on the time slot with physical time slot number 0 in the first frequency band, the second terminal obtains the time slot with physical time slot number 0 corresponding to the time slot with physical time slot number 0 in the second frequency band at the same time, and then obtains the time slot with physical time slot number 5 based on Y=5. The time slot with physical time slot number 5 is not located in the RS resource pool, so the time slot with physical time slot number 6 in the RS resource pool that is after the time slot with physical time slot number 5 and closest to the time slot with physical time slot number 5 is determined as the third time slot, and its logical time slot number is 2. Since K=1, the second terminal determines that the time domain of the second resource occupied by the first terminal is located in logical time slot 3 (physical time slot 10).

[0172] In implementation, for example, the first terminal and the second terminal may agree in advance whether to adopt Formula 1 or Formula 2, or the first terminal may send configuration information to the second terminal to instruct the second terminal to determine based on Formula 1 or Formula 2. It is understandable that when Formula 2 is adopted, the first terminal and the second terminal have no agreement on T proc1 There is a unified understanding of the value of / Y. For example, the second terminal sends a message about T to the first terminal. proc1 Configuration information, or the first terminal determines T ppoc1 After the value is obtained, the second terminal is sent a message about T proc1 Configuration information, or the first terminal and the second terminal use the T predefined in the protocol proc1 . In particular, when T proc1 = 0, Formula 2 can be transformed into Formula 1, and the first terminal and the second terminal can also be determined by T proc1 The value of determines whether to use formula 1 or formula 2.

[0173] It should be noted that this embodiment does not limit how the first SCI specifically indicates the second resource occupied by the first RS in the second time slot.

[0174] For example, to avoid compatibility issues with existing SCIs in the first frequency band and to increase the capacity of SCIs in a time slot, the SCI resource pool configured in the first frequency band may be an SCI-only resource pool, i.e., all time slots included in the SCI resource pool are used only for transmitting SCIs, allowing time division / frequency division multiplexing of SCIs in each time slot of the SCI resource pool. The SCI resources in each time slot in the SCI resource pool can be multiplexed by different terminals, indicating (or scheduling) RS resources for one or more time slots in the RS resource pool.

[0175] Similarly, the RS resource pool configured in the second frequency band can also be an RS-only resource pool, that is, all time slots included in the RS resource pool are only used to transmit RS. Considering that RS can perform frequency division / time division / comb division multiplexing within the time slot, the minimum granularity of RS resource allocation within a time slot can be expressed as subchannel × symbol group × comb tooth.

[0176] Specifically, in order to enable the first terminal to indicate the second resource occupied by the first terminal through the first SCI, the following solutions may be included during implementation.

[0177] Option 1: Fully adopt dynamic instructions

[0178] For example, the first SCI sent by the first terminal carries first information, and the first information indicates the second resource occupied by the first terminal. For example, the first information indicates at least one of the following: an index of a starting subchannel of the first RS and the number of consecutively occupied subchannels, an index of a symbol group occupied by the first RS in a time slot, an index of a comb tooth occupied by the first RS in a time slot, and an index of an occupied resource pool.

[0179] Correspondingly, in this indication manner, for the second terminal, the second resource in the second time slot is determined through the first information carried by the first SCI.

[0180] Solution 2: Configuration + dynamic indication

[0181] For example, a certain mapping relationship is configured in advance between the SCI resource pool and the RS resource pool it schedules. For example, the SCI resource pool and the RS resource pool are each configured with N2 SCI groups (also called SCI groups) and N2 RS groups (also called RS groups) in a single time slot. The SCI in the n2th SCI group is configured to indicate the RS resources in the n2th RS group. Different RS groups correspond to different subchannels and / or different symbol groups and / or different comb teeth. Where n2 ranges from 0 to N2-1.

[0182] Assuming that each RS group includes N3 RS resources, at this time, the first SCI may only carry at least one piece of information such as the subchannel, symbol group, comb index, etc. occupied by the first RS scheduled by it in the corresponding RS group.

[0183] For example, in one implementation, all RS resources within the RS group may be uniformly numbered (0, 1, ..., N3-1), and the first SCI carries the number index of the RS resource occupied by the first RS within the corresponding RS group. For another example, in another implementation, the first SCI may carry the starting subchannel index occupied by the first RS within the corresponding RS group and the number of consecutively occupied subchannels and / or symbol group index and / or comb index.

[0184] It should be understood that the configuration + dynamic indication approach can reduce the overhead of the information carried by the first SCI.

[0185] Solution 3: Fully adopt the configuration method

[0186] For example, the SCI resource pool and RS resource pool are configured to each configure N2 SCI groups and N2 RS groups in a single time slot. Each SCI group includes N3 SCI resource subgroups, and each RS group includes N3 RS resources. The SCI in the n3th SCI resource subgroup in the n2th SCI group indicates the n3th RS resource of the n2th RS group. n2 ranges from 0 to N2-1, and n3 ranges from 0 to N3-1.

[0187] Alternatively, initially, the SCI resource pool and the RS resource pool are configured with N1(N2*N3) SCI resource subgroups and N1(N2*N3) RS resources in a single time slot, and the SCI in the n1th SCI resource subgroup is configured to schedule the n1th RS resource.

[0188] Optionally, considering that the SCI of one time slot in the SCI resources can schedule RS resources of one or more time slots in the RS resource pool, an SCI resource subgroup may include one or more SCI resources, and each SCI resource may be used to transmit the SCI.

[0189] Taking Figure 10 as an example, SCI can be frequency-division / time-division multiplexed within a time slot, and RS can be frequency-division / time-division / comb-division multiplexed within a time slot. N2 SCI groups are configured in each time slot of the SCI resource pool. Each SCI group includes 4 subchannels and 2 symbol groups, for a total of 8 SCI resources. N2 RS groups are configured in the RS resource pool. Each RS group includes 1 subchannel, 2 symbol groups, and 2 comb teeth, for a total of 4 RS resources. The configuration parameters of the SCI resource pool and the RS resource pool can be different. For example, the number of PRBs included in each subchannel of the SCI resource pool can be different from the number of PRBs included in each subchannel of the RS resource pool. If the first terminal wants to use comb tooth 1 to send the first RS in the first symbol group of the N2th RS group, it can send the first SCI in the N2th SCI group, and then carry the index of the first RS in the N2th RS group in the first SCI, with a value of 1; or, each SCI group can be divided into 4 SCI resource subgroups with a granularity of 2 subchannels and 1 symbol group, and then the first terminal can directly indicate the second RS resource in the N2th RS group in the RS resource pool as shown in Figure 10 when sending the first SCI within the elliptical dotted line in the SCI resource pool.

[0190] It can be seen that in the method provided in this embodiment, by satisfying the above formula 1 or formula 2, when the first terminal sends the first SCI to the second terminal to indicate the second resource occupied by the first RS, there will be no invalid indication or delay in the first SCI indication.

[0191] However, in some cases, when the first SCI is transmitted in the first resource pool of the first frequency band and the first RS is transmitted in the second resource pool of the second frequency band, there may be a time slot for transmitting the first RS but no available time slot for transmitting the first SCI. For example, if the first resource pool is referred to as the SCI resource pool, the second resource pool is referred to as the RS resource pool, each time slot included in the SCI resource pool is referred to as an SCI time slot, and each time slot included in the RS resource pool is referred to as an RS time slot, as shown in FIG11 , assuming that one SCI time slot schedules a maximum of three RS time slots, the time slot with logical time slot number 3 in the second frequency band in FIG11 still has RS resources that are not occupied by other terminals. However, the SCI time slots that can be used to indicate this RS time slot (SCI time slots with physical time slot numbers 0 and 2 or SCI time slots with logical time slot numbers 0 and 1) are already occupied by other terminals, resulting in no SCI time slots being available for scheduling.

[0192] In view of this, the present application also provides another communication method to avoid the problem that there are no schedulable SCI time slots in the available RS time slots.

[0193] Next, an embodiment for avoiding the situation where there are no schedulable SCI time slots in the available RS time slots will be described.

[0194] For ease of understanding, in this embodiment, the first resource pool is still called the SCI resource pool, the second resource pool is called the RS resource pool, the time slots included in the first resource pool are called SCI time slots, and the time slots included in the second resource pool are called RS time slots.

[0195] In the existing sidelink, the time slots (i.e., time domain resources) included in the resource pool are determined by a bitmap. Since a direct frame number (DFN) cycle has a total of 10240*2 u time slots, u is the configuration parameter of the subcarrier spacing, and removing some synchronization time slots, TDD downlink time slots, special time slots, reserved time slots (to ensure that the remaining number of time slots can be divided by the bitmap length), etc., we can get a time slot set (t0, t1, ..., t S-1 ), if the bitmap in the configuration information of a resource pool is (b0, b1, ..., b L-1 ), for time slot t in the time slot set s , when b is satisfied k’ =1, the time slot t s Belong to the resource pool, where k′=s mod L.

[0196] For example, if the influence of the synchronization time slot, TDD downlink time slot, special time slot, and reserved time slot is not considered, in Figure 11, the bitmap of the SCI resource pool used to send SCI can be expressed as (1010010100), and the bitmap of the RS resource pool can be expressed as (1001001000).

[0197] In this embodiment, to avoid the situation where there are no schedulable SCI time slots in the available RS time slots, when determining the bitmap of the RS resource pool, the bitmap of the RS resource pool is determined based on the bitmap of the SCI resource pool, instead of configuring the SCI resource pool and the RS resource pool independently.

[0198] Specifically, in this embodiment, when the bitmap of the RS resource pool is determined based on the bitmap of the SCI resource pool, the SCI resource pool and the RS resource pool will meet the following requirements: 1) Each SCI time slot in the SCI resource pool is associated with Z RS time slots in the RS resource pool and the Z RS time slots associated with different SCI time slots in the SCI resource pool do not overlap; 2) The time at which each SCI time slot in the SCI resource pool is located is not after the earliest RS time slot among the associated Z RS time slots, so as to avoid the occurrence of a lagging indication.

[0199] For example, let association association association in The SCI time slots included in the SCI resource pool within one DFN cycle, The subscript in the lower right corner of each SCI time slot in the SCI resource pool indicates the logical time slot number of the SCI time slot. is the RS time slot included in the RS resource pool within one DFN cycle, The subscript in the lower right corner of each RS time slot in the RS resource pool indicates the logical time slot number of the RS time slot in the RS resource pool. Z is (pre) configured and is a positive integer. To avoid the occurrence of delayed indication, it is necessary to satisfy the following between the SCI resource pool and the RS resource pool: for any x (x = 0, 1, ..., X-1), the SCI time slot The time at which the time is not located in the earliest RS time slot among its associated Z RS time slots The constraints after that.

[0200] Optionally, Z is less than or equal to the ratio of the subcarrier spacing of the second frequency band to the subcarrier spacing of the first frequency band, that is: The subcarrier spacing of the second frequency band is greater than or equal to the subcarrier spacing of the first frequency band.

[0201] For example, Figure 12 is a schematic diagram of an SCI resource pool and an RS resource pool provided by this application. As shown in Figure 12, one SCI time slot is associated with two RS time slots, and each SCI time slot does not precede the first RS time slot it is associated with.

[0202] For example, Figure 13 is a schematic diagram of another SCI resource pool and RS resource pool provided by this application. As shown in Figure 13, one SCI time slot is associated with two RS time slots, and each SCI time slot does not precede the first RS time slot it is associated with.

[0203] Optionally, considering that the first RS can be sent after the first SCI decoding is completed to save power consumption of the second terminal, the constraint condition can also be updated as follows: for any x (x = 0, 1, ..., X-1), the SCI time slot The earliest RS time slot among the Z time slots associated with it The time interval between them is at least greater than the second duration, which is represented by T proc2 .

[0204] In a specific implementation, the second duration is primarily related to the duration of decoding the first SCI by the second terminal and the duration of enabling / switching the RS receive link, and its unit may be seconds / ms / us. In one implementation, the second duration is granular with a single time slot of the second frequency band where the first RS is located, and the second duration is selected to be P time slots of the second frequency band.

[0205] For example, Figure 14 is a schematic diagram of an SCI resource pool and an RS resource pool provided by this application. As shown in Figure 14, one SCI time slot is associated with two RS time slots, and the time interval between each SCI time slot and the earliest RS time slot among its associated Z time slots is at least greater than five physical time slots of the second frequency band.

[0206] It is to be noted here that there are various forms of RS resource pools and SCI resource pools that satisfy the above-mentioned constraint relationships or updated constraint conditions, and FIG. 12 to FIG. 14 are merely examples.

[0207] As an optional embodiment, if it is assumed that the length of the bitmap of the SCI resource pool (also referred to as the first bitmap in this application) is L1, it is represented as (b0, b1, ..., b i ,…,b L1-1 ), the length of the bitmap of the RS resource pool (also referred to as the second bitmap in this application) is L2, which is expressed as (c0, c1, ..., c j ,…,c L2-1 ),in, When the RS resource pool is determined based on the SCI resource pool, the bitmaps of the two resource pools satisfy the following relationship:

[0208] Where i = 0, 1,…, L1-1; z = 0, 1,…, Z-1.

[0209] Or to put it another way, when the i-th bit in the first bitmap is 1, the j-th bit in the second bitmap is 1, and j and i satisfy: j = (Mi + z + P) mod ML1, i = 0, 1, ^, L1-1, z = 0, 1, ..., Z-1.

[0210] Optional, the default value of P is 0.

[0211] It should be understood that, through this embodiment, in the SCI resource pool and RS resource pool that are finally determined, the Z RS time slots associated with each SCI time slot in the SCI resource pool are Z adjacent RS time slots on the second frequency band.

[0212] For example, the SCI resource pool uses a subcarrier spacing of 30kHz, the RS resource pool uses a subcarrier spacing of 120kHz, and one SCI time slot is configured to be associated with two RS time slots, i.e., Z=2. If P is not considered, i.e., P=0, and the bitmap of the SCI resource pool has been configured as 1001001010, then the bitmap of the RS resource pool can be directly determined to be (11000000000011…11000000), and the corresponding RS resource pool is shown in Figure 12. If P=5 is configured, the bitmap of the RS resource pool can be expressed as (00000110000000…00000110), and the corresponding RS resource pool is shown in Figure 15.

[0213] In addition, it should be understood that when the RS establishes the association relationship between the SCI resource pool and the RS resource pool directly based on the above formula three, after the bitmap of the SCI resource is configured, the bitmap of the RS resource pool can be directly determined, so there is no need to additionally configure the bitmap of the RS resource pool.

[0214] It should be understood that after the association relationship between the SCI resource pool and the RS resource pool is established, different terminals can avoid the problem of no schedulable SCI time slots in available RS time slots by selecting SCI time slots associated with determined RS time slots to send SCI.

[0215] Therefore, in this embodiment, when the first terminal transmits the first SCI to indicate to the second terminal the second resource used by the first RS scheduled by the first terminal, the first time slot selected for transmitting the first SCI is a time slot associated with the second time slot to which the second resource belongs. Furthermore, it is also understood that due to the aforementioned association between the SCI resource pool and the RS resource pool, when the first terminal transmits the first SCI, the problems of invalid indication and delayed indication are avoided.

[0216] Considering that one SCI time slot is associated with Z RS time slots, in order to avoid resource conflicts, the number of SCI candidate resources in one SCI time slot is configured to be equal to the number of RS candidate resources in Z RS time slots.

[0217] Optionally, the number of RS resources in Z RS time slots = Z*the number of RS resources in 1 RS time slot, where 1 RS resource can be understood as the minimum granularity of RS resource allocation, for example, 1 subchannel×1 symbol group×1 comb tooth.

[0218] Under this configuration, similar to the embodiment shown in FIG7 , the first terminal may further implement the indication of the RS second resource by the first SCI through dynamic indication and / or configuration.

[0219] One possible implementation is to use a fully dynamic indication approach:

[0220] For example, during implementation, the first SCI not only carries information indicating which of its associated Z RS time slots the currently scheduled second time slot is, but also carries information indicating the starting subchannel index occupied by the first RS scheduled by it in the second time slot and the number of subchannels it continuously occupies, the symbol group index, the comb index, etc.

[0221] Another possible implementation is to use a fully configured approach:

[0222] For example, considering that the number of SCI resources in 1 SCI time slot = the number of RS resources in Z RS time slots, different SCI resources in 1 SCI time slot are scheduled to different RS resources in Z RS time slots. In this way, the position of the second resource of the first RS scheduled based on the position of the first SCI sent in the SCI time slot can be directly determined.

[0223] Another possible approach is to combine dynamic indication with configuration:

[0224] For example, the first SCI carries information indicating which of the Z RS time slots associated with the second time slot to which the currently scheduled first RS belongs, so that the SCI resource pool and the RS resource pool are each configured with N2 SCI groups and N2 RS groups in a single time slot, and the SCI in the N2th SCI group is configured to schedule the RS resources in the N2th RS group. The first SCI carries information indicating the subchannel, symbol group, and comb index occupied by the first RS scheduled by it in the corresponding RS group. For example, all RS resources in the RS group can be uniformly numbered, and the first SCI carries the number index of the RS resources occupied by the first RS in the corresponding RS group, or can also carry the starting subchannel index occupied by the first RS in a single RS group and the number of subchannels and / or symbol group index and / or comb index continuously occupied by it. Alternatively, each RS group may be configured to include N3 RS resources, each SCI group may include N3 SCI resource subgroups (each resource subgroup includes Z SCI resources), and the SCI in the n3th SCI resource subgroup in the n2th SCI group may schedule the n3th RS resource in the n2th RS group.

[0225] For example, there are other forms of combining dynamic indication with configuration: for example, the SCI resource pool configures N2 SCI groups in a single time slot, and the RS resource pool configures a total of N2 RS groups in Z RS time slots. Optionally, each RS time slot is configured with N2 / Z RS groups, and the SCI in the n2th SCI group is configured to schedule the RS resources in the n2th RS group. The first SCI only carries resource index information indicating the resource occupied by the first RS it schedules in a single RS group.

[0226] For example, an example of resource indication is shown in FIG16 . In FIG16 , one SCI slot is associated with two RS slots. One SCI slot is divided into N2 SCI groups, and two RS slots are divided into a total of N2 RS groups. The SCI in the n2th SCI group schedules the RS in the n2th RS group. Each SCI group / RS group includes four SCI / RS candidate resources. Whether using dynamic indication or configuration, it can be ensured that the available RS resources always have SCI resources that can schedule the RS.

[0227] The above describes how to implement the scheme provided by this application for sending a first SCI on a first frequency band to indicate the time-frequency resources selected by the first RS sent on a second frequency band. It should be noted that the concept of the above scheme can also be extended to the scenario where the resources used by the transmitted data signal are indicated by the SCI.

[0228] When extended to the scenario where SCI is used to indicate the resources used by the transmitted data signal, the first reference signal in the above-described embodiment can be replaced with the first data signal, and accordingly, the corresponding second resource pool is replaced with a resource pool configured for transmitting the data signal.

[0229] For example, when extended to SCI indicating the first data signal, the communication method includes: determining a third resource for sending a second SCI, the second SCI is used to indicate the fourth resource used by the scheduled first data signal, the third resource is located in the fifth time slot of the first resource pool in the time domain, the frequency domain of the first resource pool is located in the first frequency band, the fourth resource is located in the sixth time slot of the second resource pool in the time domain, the frequency domain of the second resource pool is located in the second frequency band, the first resource pool and the second resource pool have different physical time slots, wherein the sixth time slot is the Kth time slot after the seventh time slot in the second resource pool, and the physical time slot number of the seventh time slot in the second frequency band is not before the physical time slot number of the time slot corresponding to the fifth time slot in the second frequency band at the same time; sending the second SCI on the third resource; accordingly, the second terminal receives the second SCI on the third resource and receives the first data signal on the fourth resource based on the indication of the second SCI.

[0230] In addition, it should be noted that the resource indication method shown in FIG. 10 or FIG. 16 can also be extended to the case where SCI and RS resources are frequency-division multiplexed in the same resource pool.

[0231] For example, all PRBs in a resource pool can be divided into two non-overlapping consecutive PRB sets, one of which is used to send SCI and the other is used to send RS. The former includes N4 SCI resources, corresponding to N4 different RS resources. One RS resource can be regarded as 1 subchannel × 1 symbol group × 1 comb tooth. Considering reasonable automatic gain control (AGC) adjustment, SCI can use the same time division multiplexing method as RS. Considering that RS can be sent after SCI decoding is completed, cross-slot scheduling can be combined. For example, the SCI of the qth logical time slot in the resource pool schedules the RS of the q+Gth logical time slot. The value of G can be (pre) configured. For example, as shown in Figure 17, SCI and RS are frequency-division multiplexed in the same resource pool. The SCI part in a single time slot includes a total of 4 SCI resources (frequency division + time division multiplexing), and the RS part also includes 4 RS resources (time division + comb division multiplexing). Combined with cross-slot scheduling, the nth SCI resource in the qth time slot indicates the nth RS resource in the q+Gth time slot, n = 1, 2, 3, 4.

[0232] The communication method of an embodiment of the present application is described in detail above in conjunction with Figures 7 to 17. The communication device provided in the present application will be described in detail below in conjunction with Figures 18 and 19.

[0233] FIG18 is a schematic structural diagram of a communication device according to an embodiment of the present application. Specifically, as shown in FIG18 , the device 1800 includes a transceiver module 1801 and a processing module 1802 .

[0234] In a first embodiment, the communication device is applied to a first terminal that sends a first SCI.

[0235] Specifically, in the first embodiment, the processing module 1802 is used to determine a first resource for sending a first side link control information SCI, the first SCI is used to indicate a second resource used by a scheduled first reference signal RS, the first resource is located in the first time slot of the first resource pool in the time domain, the frequency domain of the first resource pool is located in the first frequency band, the second resource is located in the second time slot of the second resource pool in the time domain, the frequency domain of the second resource pool is located in the second frequency band, the first resource pool and the second resource pool have different physical time slots, wherein the second time slot is the Kth time slot after the third time slot in the second resource pool, and the physical time slot number of the third time slot in the second frequency band is not before the physical time slot number of the time slot corresponding to the first time slot in the second frequency band at the same time; the transceiver module 1802 is used to send the first SCI on the first resource.

[0236] In one possible implementation, when the time slot corresponding to the first time slot in the second frequency band is located in the second resource pool, the third time slot is the time slot corresponding to the first time slot in the second frequency band; or, when the time slot corresponding to the first time slot in the second frequency band is not located in the second resource pool, the third time slot is the time slot in the second resource pool that is closest to the time slot corresponding to the first time slot in the second frequency band.

[0237] In one possible implementation, the third time slot is the Yth time slot after the time slot corresponding to the second frequency band of the first time slot; or, the third time slot is the time slot in the second resource pool that is located after the fourth time slot and is closest to the fourth time slot, and the fourth time slot is the Yth time slot after the time slot corresponding to the second frequency band of the first time slot;

[0238] Y is determined based on a first duration, and the first duration is related to a duration for decoding the first SCI and / or a duration for opening an RS receiving link.

[0239] In a possible implementation, a manner of obtaining the first duration includes at least one of the following: configured through signaling, configured by a higher layer, or predefined by a protocol.

[0240] In one possible implementation, each time slot in the first resource pool is used only to transmit SCI, and each time slot in the second resource pool is used only to transmit RS; wherein each time slot in the first resource pool can schedule one time slot or multiple time slots in the second resource pool.

[0241] In one possible implementation, the time slots included in the first resource pool are determined based on a first bit map, the time slots included in the second resource pool are determined based on a second bit map, the second bit map is determined according to the first bit map, each time slot in the first resource pool is associated with Z time slots in the second resource pool, and the Z time slots associated with different time slots in the first resource pool do not overlap with each other, the time at which each time slot in the first resource pool is located is not after the earliest time slot among the associated Z time slots, and Z is a positive integer; wherein, when the first SCI is sent on the first resource, the first time slot is associated with the second time slot.

[0242] In a possible implementation, Z is less than or equal to a ratio of a subcarrier spacing of the second frequency band to a subcarrier spacing of the first frequency band.

[0243] In one possible implementation, the time interval between the moment of each time slot in the first resource pool and the earliest time slot among the associated Z time slots is greater than a second duration, and the second duration is related to the duration of decoding the first SCI and / or the duration of opening the RS receiving link.

[0244] In a possible implementation, a manner for obtaining the second duration includes at least one of the following: configured through signaling, configured by a higher layer, or predefined by a protocol.

[0245] In a possible implementation, the second duration is P time slots in the second frequency band, where P is a positive integer.

[0246] In a possible implementation, the Z time slots associated with each time slot in the first resource pool are Z adjacent time slots on the second frequency band.

[0247] In one possible implementation, the length of the first bitmap is L1, the length of the second bitmap is ML1, and M is the ratio of the subcarrier spacing of the second frequency band to the subcarrier spacing of the first frequency band; wherein, when the i-th bit of the first bitmap is 1, the j-th bit of the second bitmap is 1, and j and i satisfy: j = (Mi + z + P) mod ML1, z = 0, 1, ..., Z-1.

[0248] In a possible implementation, the number of SCI resources included in each time slot in the first resource pool is the same as the total number of RS resources included in the associated Z time slots.

[0249] In a possible implementation, the number of RS resources included in each of the Z time slots associated with each time slot in the first resource pool is a ratio of the number of SCI resources included in each time slot in the first resource pool to Z.

[0250] In a possible implementation, the first SCI is used to indicate the second resource used by the scheduled first reference signal RS, including: the first SCI carries first information, the first information indicates the second resource, and the first information includes a parameter for indicating K.

[0251] In one possible implementation, each time slot in the first resource pool includes N1 resource subgroups, each time slot in the second resource pool includes N1 RS resources, and the SCI sent on the n1th resource subgroup in the N1 resource subgroups indicates the n1th RS resource in the N1 RS resources; wherein, the first SCI is used to indicate the second resource used by the scheduled first RS, including: indicating the second resource by the position of the first resource used by the first SCI within the first time slot.

[0252] In a second embodiment, the communication device is applied to a second terminal that receives a first SCI.

[0253] Specifically, in the second embodiment, the receiving module 1801 is used to receive the first side link control information SCI on the first resource, the first SCI is used to indicate the second resource used by the first reference signal RS, the first resource is located in the first time slot of the first resource pool in the time domain, the frequency domain of the first resource pool is located in the first frequency band, the second resource is located in the second time slot of the second resource pool in the time domain, the frequency domain of the second resource pool is located in the second frequency band, and the first resource pool and the second resource pool have different physical time slots; the processing module 1802 is used to receive the first RS on the second resource based on the indication of the first SCI; wherein the second time slot is the Kth time slot after the third time slot in the second resource pool, and the physical time slot number of the third time slot in the second frequency band is not before the physical time slot number of the time slot corresponding to the first time slot in the second frequency band at the same time.

[0254] In one implementation, the first SCI carries first information, the first information indicates the second resource, and the first information includes a parameter for indicating K; the processing module 1802 is further used to: determine the second resource based on the first information.

[0255] In one implementation, the processing module 1802 is further configured to determine the second resource based on a position of the first resource used by the first SCI within the first time slot.

[0256] Figure 19 is a schematic structural diagram of a communication device provided in another embodiment of the present application. The device shown in Figure 19 can be used to execute the method described in any of the above embodiments.

[0257] As shown in Figure 19, the apparatus 1900 of this embodiment includes a memory 1901 and a processor 1902. Optionally, the apparatus 1900 also includes a communication interface 1903 and a bus 1904. The memory 1901, the processor 1902, and the communication interface 1903 are connected to each other via the bus 1904.

[0258] The memory 1901 may be a read-only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM). The memory 1901 may store a program. When the program stored in the memory 1901 is executed by the processor 1902, the processor 1902 is configured to perform the steps of the method shown in Figures 7 to 17.

[0259] The processor 1902 can be a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits to execute relevant programs to implement the methods shown in Figures 7 to 17 of the present application.

[0260] The processor 1902 may also be an integrated circuit chip having signal processing capabilities. In the implementation process, each step of the method of FIG. 7 to FIG. 17 of the embodiment of the present application may be completed by an integrated logic circuit of hardware in the processor 1902 or by instructions in the form of software.

[0261] The processor 1902 may also be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component. The processor 1902 may implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or any conventional processor.

[0262] The steps of the method disclosed in conjunction with the embodiments of the present application can be directly embodied as being executed by a hardware decoding processor, or can be executed by a combination of hardware and software modules in the decoding processor. The software module can be located in a storage medium mature in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 1901, and the processor 1902 reads the information in the memory 1901 and, in combination with its hardware, completes the functions required to be performed by the units included in the device of the present application. For example, the various steps / functions of the embodiments shown in Figures 7 to 17 can be executed.

[0263] The communication interface 1903 may use, but is not limited to, a transceiver or other transceiver device to implement communication between the apparatus 1900 and other devices or a communication network.

[0264] The bus 1904 may include a path for transmitting information between various components of the device 1900 (eg, the memory 1901 , the processor 1902 , and the communication interface 1903 ).

[0265] It should be understood that the apparatus 1900 shown in the embodiment of the present application can be an electronic device, or a chip configured in an electronic device. The apparatus 1900 can be deployed in a terminal device, or can also be deployed in a network device.

[0266] The above embodiments can be implemented in whole or in part by software, hardware, firmware or any other combination. When implemented using software, the above embodiments can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer program are loaded or executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center via a wired (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that contains one or more available media sets. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium. The semiconductor medium can be a solid-state drive.

[0267] It should be understood that the term "and / or" as used herein simply describes a relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A alone, A and B together, or B alone. A and B can be singular or plural. Furthermore, the character " / " as used herein generally indicates an "or" relationship between the associated objects, but it may also indicate an "and / or" relationship. For specific understanding, please refer to the context.

[0268] In this application, "at least one" means one or more, and "plurality" means two or more. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or plural.

[0269] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0270] Those skilled in the art will appreciate that the units and algorithm steps of each example 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.

[0271] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0272] 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 schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0273] The units described as separate components may or may not be physically separate, 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 these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0274] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0275] 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 execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk, or an optical disk.

[0276] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

[0277] .

Claims

1. A communication method, characterized in that: include: Determine a first resource for sending first sidelink control information SCI, where the first SCI is used to indicate a second resource used by a scheduled first reference signal RS, where the first resource is located in a first time slot of a first resource pool in the time domain, and the frequency domain of the first resource pool is located in a first frequency band, where the second resource is located in a second time slot of a second resource pool in the time domain, and the frequency domain of the second resource pool is located in a second frequency band, where the first resource pool and the second resource pool have different physical time slots, where the second time slot is the Kth time slot after the third time slot in the second resource pool, and where the physical time slot number of the third time slot in the second frequency band is not located before the physical time slot number of the time slot corresponding to the first time slot in the second frequency band at the same time; The first SCI is sent on the first resource.

2. The method according to claim 1, characterized in that When the time slot corresponding to the first time slot in the second frequency band is located in the second resource pool, the third time slot is the time slot corresponding to the first time slot in the second frequency band; or, When the time slot corresponding to the first time slot in the second frequency band is not located in the second resource pool, the third time slot is the time slot in the second resource pool that is closest to the time slot corresponding to the first time slot in the second frequency band.

3. The method according to claim 1, characterized in that The third time slot is the Yth time slot after the time slot corresponding to the second frequency band of the first time slot; or, the third time slot is a time slot in the second resource pool that is located after the fourth time slot and is closest to the fourth time slot, and the fourth time slot is the Yth time slot after the time slot corresponding to the second frequency band of the first time slot; Among them, Y is determined based on a first duration, and the first duration is related to a duration for decoding the first SCI and / or a duration for opening an RS receiving link.

4. The method according to claim 3, characterized in that: The manner of acquiring the first duration includes at least one of the following: configured through signaling, configured at a high level, or predefined by a protocol.

5. The method according to any one of claims 1 to 4, characterized in that Each time slot in the first resource pool is used only for transmitting SCI, and each time slot in the second resource pool is used only for transmitting RS; Each time slot in the first resource pool can schedule one time slot or multiple time slots in the second resource pool.

6. The method according to any one of claims 1 to 5, characterized in that The time slots included in the first resource pool are determined based on a first bitmap, the time slots included in the second resource pool are determined based on a second bitmap, the second bitmap is determined according to the first bitmap, each time slot in the first resource pool is associated with Z time slots in the second resource pool, and the Z time slots associated with different time slots in the first resource pool do not overlap with each other, and the time at which each time slot in the first resource pool is located is not after the earliest time slot among the associated Z time slots, and Z is a positive integer; When a first SCI is sent on the first resource, the first time slot is associated with the second time slot.

7. The method according to claim 6, characterized in that Z is less than or equal to the ratio of the subcarrier spacing of the second frequency band to the subcarrier spacing of the first frequency band.

8. The method according to claim 6 or 7, characterized in that: The time interval between the time of each time slot in the first resource pool and the earliest time slot among the associated Z time slots is greater than a second duration, and the second duration is related to the decoding duration of the first SCI and / or the duration of opening the RS receiving link.

9. The method according to claim 8, characterized in that The second duration is obtained in at least one of the following ways: configured by signaling, configured by a high layer, or predefined by a protocol.

10. The method according to claim 8 or 9, characterized in that: The second time length is P time slots in the second frequency band, where P is a positive integer.

11. The method according to any one of claims 6 to 10, characterized in that The Z time slots associated with each time slot in the first resource pool are Z adjacent time slots on the second frequency band.

12. The method according to claim 11, characterized in that The length of the first bitmap is L1, the length of the second bitmap is ML1, and M is the ratio of the subcarrier spacing of the second frequency band to the subcarrier spacing of the first frequency band; wherein, when the i-th bit of the first bitmap is 1, the j-th bit of the second bitmap is 1, and j and i satisfy: j=(Mi+z+P)mod ML1,z=0,1,…,Z-1.

13. The method according to any one of claims 6 to 12, characterized in that The number of SCI resources included in each time slot in the first resource pool is the same as the total number of RS resources included in the associated Z time slots.

14. The method according to claim 13, characterized in that The number of RS resources included in each of the Z time slots associated with each time slot in the first resource pool is the ratio of the number of SCI resources included in each time slot in the first resource pool to Z.

15. The method according to any one of claims 1 to 14, characterized in that The first SCI is used to indicate a second resource used by a scheduled first reference signal RS, including: The first SCI carries first information, the first information indicates the second resource, and the first information includes a parameter for indicating K.

16. The method according to any one of claims 1 to 14, characterized in that Each time slot in the first resource pool includes N1 resource subgroups, each time slot in the second resource pool includes N1 RS resources, and the SCI sent on the n1th resource subgroup in the N1 resource subgroups indicates the n1th RS resource in the N1 RS resources; The first SCI is used to indicate a second resource used by a scheduled first reference signal RS, including: The second resource is indicated by a position of a first resource used by the first SCI within the first time slot.

17. A communication method, characterized in that: include: receiving first sidelink control information SCI on a first resource, where the first SCI is used to indicate a second resource used by a first reference signal RS, where the first resource is located in a first time slot of a first resource pool in a time domain, and a frequency domain of the first resource pool is located in a first frequency band, where the second resource is located in a second time slot of a second resource pool in a time domain, and a frequency domain of the second resource pool is located in a second frequency band, and where the first resource pool and the second resource pool have different physical time slots; receiving a first RS on the second resource based on an indication of the first SCI; The second time slot is the Kth time slot after the third time slot in the second resource pool, and the physical time slot number of the third time slot in the second frequency band is not before the physical time slot number of the time slot corresponding to the first time slot in the second frequency band at the same time.

18. The method according to claim 17, characterized in that The first SCI carries first information, the first information indicates the second resource, and the first information includes a parameter for indicating K; When the first RS is received on the second resource, the method further includes: The second resource is determined based on the first information.

19. The method according to claim 17, characterized in that The receiving the first RS on the second resource includes: The second resource is determined based on a position of a first resource used by the first SCI within the first time slot.

20. A communication device, characterized in that: include: processor, The processor is configured to enable the communication device to implement the method according to any one of claims 1 to 16 by executing a computer program and / or a logic circuit.

21. A communication device, characterized in that: include: processor, The processor is configured to enable the communication device to implement the method according to any one of claims 17 to 19 by executing a computer program and / or through a logic circuit.

22. A computer readable medium, characterized in that The computer-readable medium stores a program code for computer execution, the program code including instructions for executing the method according to any one of claims 1 to 16 or claims 17 to 19.

23. A computer program product, characterized in that The computer program product includes computer program codes, and when the computer program codes are executed on a computer, the computer is enabled to implement the method according to any one of claims 1 to 16 or claims 17 to 19.

24. A communication system, characterized in that: Includes the communication device as claimed in claim 20 and the communication device as claimed in claim 21.

25. A chip, characterized in that: It includes at least one processor and a communication interface, the communication interface and the at least one processor are interconnected by a line, and the at least one processor is used to run a computer program or instruction to perform the communication method as described in any one of claims 1 to 16 or the communication method as described in any one of claims 17 to 19.

Images