Communication method and communication device

Abstract

The invention provides a communication method and a communication device. In the communication method provided by the invention, when a first SCI is sent on a first resource of a first resource pool to indicate that a first RS 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 on a time domain, and a frequency domain of the first resource pool is located in a first frequency band; the first resource is located in a first time slot of the first resource pool in the time domain, the second resource is located in a second time slot of the second resource pool in the time domain, the frequency domain resource 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, and the second time slot is a Kth time slot after a third time slot in the second resource pool; 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 moment.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of communications, and in particular, to a communication method and a communication device. Background Art

[0002] In the sidelink (SL) communication scenario, the terminal can sense through the time-frequency resources in the SL. For example, the terminal uses the time-frequency resources in the SL to send a reference signal (also called a perception signal), and receives the echo of the perception signal and compares it with the sent perception signal to sense the distance, speed and other information of the target object.

[0003] In order to prevent conflicts between different terminals 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 is also convenient for the receiving terminal to receive the perception signal.

[0004] 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 does not need to be very 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. Summary of the invention

[0005] 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.

[0006] 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 the first SCI on the first resource; wherein the first resource is located in a first time slot of a first resource pool in 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 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.

[0007] 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.

[0008] In this embodiment, the transmitting end sends a first SCI on the first resource in the first resource pool to indicate the second resource in the scheduled second resource pool for sending the first RS. The first resource pool belongs to the first frequency band in the frequency domain, and the second resource pool belongs to the 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 the first SCI via the first frequency band to indicate the second resource occupied by the first RS sent on the second frequency band. The first frequency band and the second frequency band have different physical time slots.

[0009] Exemplarily, the first frequency band is the FR1 frequency band, and the second frequency band is the FR2 frequency band.

[0010] 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.

[0011] Among them, the second time slot is the Kth time slot after the third time slot in the second resource pool, which can be understood as: the second time slot and the third time slot are both time slots included in the second resource pool that can send RS, 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. Among them, for the third time slot, it is necessary to satisfy 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.

[0012] 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 the present 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 called the logical time slot offset.

[0013] There are several ways to implement it:

[0014] 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, 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 (for example, called the first target time slot) is obtained as u RS and u SCI The subcarrier spacing configuration parameters of the first frequency band and the second frequency band are respectively represented; 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 (represented as K R ' S ) 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:

[0015]

[0016] in, Indicates that the physical time slots are numbered as The logical time slot number of the third time slot after the first target time slot is converted.

[0017] 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 as 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.

[0018] 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 that invalid indication will not occur.

[0019] 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, on the basis of method 1, a first time length is reserved between the first time slot for sending 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 represented as T proc1 , T proc1 Corresponding to Y time slots in the second frequency band, at this time, Updated to:

[0020]

[0021] in, Indicates that the physical time slots in the second frequency band are numbered as The logical time slot number of the time slot (i.e., the third time slot) after the conversion from the time slot (also called the fourth time slot).

[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. 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 first time slot in the second frequency band; or, if the fourth time slot is not in the second resource pool, in this case, 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 is obtained in at least one of the following ways: 1) It may be configured, for example, the receiving end receiving the first SCI configures the sending end sending the first SCI. 2) It is configured by a high layer of the terminal sending the first SCI; the high layer here refers to a high layer, including a layer located above the physical layer. 3) It is predefined by the 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 time slot or multiple time slots in the second resource pool.

[0025] In combination with the first aspect, in one implementation method, 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.

[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 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, 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] Through this implementation, the power consumption of the receiving end can be saved.

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

[0031] In combination with the first aspect, in a possible implementation manner, the Z time slots associated with each time slot in the first resource pool are Z adjacent time slots in the second frequency band.

[0032] For example, in one embodiment, the length of the first bit map is L1, the length of the second bit map 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 bit map is 1, the j-th bit of the second bit map 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 is explained here that in this embodiment, when the second resource for sending the first RS in the second time slot in the second resource pool is indicated by the first SCI, there is no restriction on how to specifically indicate the second resource in the second time slot. For example, it can be a purely dynamic indication, or a purely pre-configured method, or a combination of dynamic and pre-configured methods.

[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 subchannels occupied continuously, the index of the symbol group occupied by the RS in a time slot, the index of the comb teeth 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 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;

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

[0039] In a second aspect, the present application provides a communication method, including: receiving a first SCI on a first resource, the first SCI being used to indicate a second resource used by a first RS, the first resource being located in a first time slot of a first resource pool in time domain, the frequency domain of the first resource pool being located in a first frequency band, the second resource being located in a second time slot of a second resource pool in time domain, the frequency domain resources of the second resource pool being located in a second frequency band, the first resource pool and the second resource pool having 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 manner 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 method, 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 time slot or multiple time slots in the second resource pool.

[0044] In combination with the second aspect, in one implementation method, 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 combination 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 on 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 a 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, where the second resource is located in a second resource pool, where the first resource pool is located in a first frequency band in the frequency domain, and where 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, where the second resource is located in a second resource pool, where the first resource pool is located in a first frequency band in the frequency domain, and where 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 manner thereof.

[0062] In combination with the fifth 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 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 as described in the second aspect or any possible implementation manner thereof.

[0064] In combination with the fourth 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 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 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 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, wherein the program code includes 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 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 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 runs 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 refer to the technical effects brought about by the above-mentioned first aspect to and any possible implementation method therein, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] Figure 1 A schematic diagram of a communication scenario of an application provided by this application;

[0075] Figure 2 Another schematic diagram of a communication scenario of an application provided by this application;

[0076] Figure 3 is a schematic diagram of a time slot structure for locating a resource pool;

[0077] Figure 4 A schematic diagram of sending SCI in FR2 band;

[0078] Figure 5 A schematic diagram of an invalid indication of SCI provided by the present application;

[0079] Figure 6 A schematic diagram of a delayed indication of SCI provided in the present application;

[0080] Figure 7 A flow chart of a communication method provided by this application;

[0081] Figure 8-Figure 9 A schematic diagram of a time slot indicated by an SCI provided in this application;

[0082] Fig.10 A schematic diagram of another SCI-indicated resource provided for this application;

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

[0084] Fig.16 A schematic diagram of a resource indicated by SCI provided for this application;

[0085] Fig.17 A schematic diagram of a resource indicated by SCI provided for this application;

[0086] Fig.18 A structural schematic diagram of a communication device provided by the present application;

[0087] Fig.19 A structural schematic diagram of another communication device provided in this application. DETAILED DESCRIPTION

[0088] To facilitate understanding of the embodiments of the present application, first Figure 1 and Figure 2 The communication scenarios applicable to the embodiments of the present application are introduced in detail.

[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. Figure 1In the communication scenario shown, the terminal 110 and the terminal 120 can communicate with each other through wireless communication technology. The communication link between the terminal 110 and the terminal 120 can be called a side link or other names; the air interface for direct communication between the terminal 110 and the terminal 120 is called PC5 or other names, which is not limited in the embodiments of the present application.

[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 (public land mobile The embodiment of the present application does not limit this.

[0092] As an example and not a limitation, in the present application, the terminal may be a terminal in an Internet of Things (IoT) system. The Internet of Things is an important part of the future development of information technology. Its main technical feature is to connect objects to the network through communication technology, thereby realizing an intelligent network of human-machine interconnection and object-to-object interconnection. For example, the terminal in the embodiment of the present application may be a wearable device. Wearable devices may also be called wearable smart devices, which are a general term for wearable devices that are intelligently designed and developed using wearable technology for daily wear, 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 clothes or accessories. Wearable devices are not only a hardware device, but also can realize powerful functions through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include full-featured, large-size, and can realize complete or partial functions without relying on smartphones, such as smart watches or smart glasses, etc., as well as those that only focus on a certain type of application functions and need to be used in conjunction with other devices such as smartphones, such as various types of smart bracelets and smart jewelry for vital sign monitoring.

[0093] As an example but not limitation, in the embodiment of the present application, the terminal may also be a terminal in machine type communication (MTC). In addition, the terminal may also be a vehicle-mounted module, a vehicle-mounted module, a vehicle-mounted component, a vehicle-mounted chip or a vehicle-mounted unit, etc., which is built into the vehicle as one or more components or units. The vehicle can implement the method provided by the present application through the built-in vehicle-mounted module, vehicle-mounted module, vehicle-mounted component, vehicle-mounted chip or vehicle-mounted unit, etc. 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 but not limitation, in the embodiment of the present application, the terminal may also be a terminal in machine type communication (MTC). In addition, the terminal may also be a vehicle-mounted module, a vehicle-mounted module, a vehicle-mounted component, a vehicle-mounted chip or a vehicle-mounted unit, etc., which is built into the vehicle as one or more components or units. The vehicle can implement the method provided by the present application through the built-in vehicle-mounted module, vehicle-mounted module, vehicle-mounted component, vehicle-mounted chip or vehicle-mounted unit, etc. 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 This is a simplified schematic diagram for ease of understanding. In other possible scenarios, the communication scenario may also include other devices. Figure 1 For example, Figure 1 The scene shown may also include network devices. Figure 1 When the scenario shown includes network devices, such as Figure 2 As shown, the terminal 110 and the terminal 120 may both be within the coverage of the network device (eg Figure 2 (a) and (b) in FIG. 1 ); or, the terminal 110 and the terminal 120 may be one terminal within the coverage of the network device 110 and one terminal not within the coverage of the network device 110 (eg Figure 2 Alternatively, both the terminal 110 and the terminal 120 are not within the coverage of the network device (e.g. Figure 2 (d) in the figure.

[0096] It should be noted that in Figure 2 In the scenarios shown in (a), (b) and (c), terminal 110 is within the network coverage of the network device. Terminal 110 can communicate with terminal 120 by scheduling resources through the network device. Such resources scheduled by the network device can be called authorized resources or authorized frequency bands. Alternatively, terminal 110 and terminal 120 can communicate without using the network device scheduling mode. For example, 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, so as to communicate with terminal 120. Figure 2In the scenario shown in (d), both terminal 110 and terminal 120 are outside the network coverage of the network device, so terminal 110 and terminal 120 cannot communicate sideways by scheduling resources through the network device, and need to communicate sideways by selecting resources by themselves. The resources in this application refer to time-frequency resources.

[0097] It should be understood that Figure 2 The network device in the scenario shown 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 (baseband unit, BBU), or a wireless controller in a cloud radio access network (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 network devices can also be urban network devices, micro network devices, micro-micro network devices, micro-micro 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, or 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] exist Figure 1 and Figure 2 In the SL communication scenario shown, in order to support communication perception integration, the terminal can use the time and frequency resources in the SL for perception.

[0100] Exemplarily, 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 called a perception signal, and then receive the echo of the perception signal and compare it with the sent perception signal to perceive the distance, speed and other information of the target object (such as a person, an obstacle, etc.). Alternatively, the terminals can also perceive each other by sending a perception signal and receiving a perception signal. In this application, for the sake of ease of description, the reference signal for perception is also called a perception signal.

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

[0102] In the present 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 referred to as 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 and 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] For example, in SL positioning, a time slot structure of a resource pool dedicated to positioning is as follows: Figure 3As shown, 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, a plurality of 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, it is considered that 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 with communication services, perception services require a larger bandwidth. For example, in order to achieve a ranging resolution of 0.1 meters to distinguish multiple target objects, the perception signal bandwidth needs to be at least 1.5GHz. Since the spectrum resources in the FR2 band are relatively abundant and can provide the bandwidth required for larger perception signals, it is very likely that a large bandwidth resource pool for transmitting perception signals will be configured in the FR2 band in the future. However, the bandwidth required to send SCI does not need to be very large. At this time, if PSCCH and perception signals continue to use time division multiplexing in the same time slot, it will cause a serious waste of resources.

[0108] For example, Figure 4 As shown, 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 about 100MHz, which can be almost consistent with the bandwidth of PRS, and 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 about 430MHz. If PSCCH and PRS continue to use time division multiplexing in the time slot, it will cause more serious resource waste.

[0109] In order to avoid resource waste, one way is to make SCI and RS use frequency division multiplexing to decouple the SCI bandwidth and RS bandwidth. In addition, when the terminal uses mode 2 resource allocation to autonomously select RS resources, it needs to decode the SCI sent by other terminals. However, the FR2 path loss is large, the beam is easily misaligned, and the SCI decoding performance is poor. Moreover, when SCI and RS are frequency-division multiplexed in the FR2 band, the available bandwidth of RS in the FR2 band will become smaller and the ranging resolution will be reduced. 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, without the need for complex communication modules such as decoding and demodulation.

[0110] However, since the FR1 and FR2 bands have different subcarrier spacings, the time slot numbers of the two bands are not uniform, resulting in SCI not being able to Figure 3 Therefore, how to send SCI in the FR1 frequency band to indicate the RS resources selected by the terminal for sending RS in the FR2 frequency band across carriers becomes a technical problem to be solved urgently.

[0111] At present, one way of cross-carrier indication is that TS 38.214 specifies cross-carrier indication, that is, how to indicate the physical downlink shared channel (PDSCH) across carriers through downlink control information (DCI). The physical time slot number of the time slot where the DCI is located and the time slot where the scheduled PDSCH is located satisfies the formula:

[0112] Where n 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 indicates the offset of the time slot determined by DCI, which is determined based on the parameter set (numerology) of PDSCH. μPDSCH and μPDCCH respectively represent the subcarrier spacing configuration parameters of PDSCH and PDCCH. 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. The time slots belonging to the resource pool configured for SL transmission can be renumbered to form the corresponding logical time slot numbers. Therefore, the cross-carrier time slot indication formula in NR cannot be directly applied, which may cause invalid indication.

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

[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, Figure 6 As shown, if the SCI is transmitted on the time slot with a logical time slot number of 1 (a 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 (a 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 in the FR2 frequency band for sending RS 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 sending a signal on one resource pool to send another signal on the resources in another resource pool, wherein the two resource pools have non-identical physical time slots.

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

[0120] Combination Figure 7 , a schematic diagram illustrating the process of the communication method provided by this application. Figure 7 As shown, 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, and 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 the second time slot in the time domain, the second time slot is included in the second resource pool, the second resource pool is a resource pool configured for sending RS, and 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.

[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 here are only examples and do not constitute limitations of this application.

[0129] It should be understood that the first terminal needs to indicate the resources (ie, second resources) occupied by the first terminal for sending the first RS to other terminals (referred to as the second terminal in this application) 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 a network device (also called a scheduled resource); or it can be a method in which the first terminal autonomously selects a 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 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 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 (expressed as K R ' S ) 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). The process can be expressed as the following formula 1:

[0136]

[0137] in, Indicates that the physical time slots are numbered as The logical time slot number of the third time slot after the first target time slot is converted.

[0138] 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 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 (that is, the third time slot is not located before the first target time slot). In implementation, for the first implementation scheme, there are two situations for determining the third time slot:

[0139] 1) If the first target time slot is located in the RS resource pool, then the third time slot is determined as the first target time slot.

[0140] 2) If the first target time slot is not located in the RS resource pool, then the time slot in the RS resource pool located after the first target time slot and closest to the first target time slot is determined as the third time slot after conversion.

[0141] Combination Figure 8 , taking the case where the first target time slot is located in the RS resource pool as an example.

[0142] 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 of the second frequency band, which is the time slot with the physical time slot number 16. The 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:

[0143] If K=0, 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 of 4 in the first frequency band is located in the time slot with the physical time slot number of 16 in the second frequency band, which can also be understood as the second resource used by the first RS indicated by the first SCI sent on the time slot with the logical time slot number of 1 in the SCI resource pool is located in the time slot with the logical time slot number of 5 in the RS resource pool;

[0144] If K=1, 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, which can also be understood as 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;

[0145] 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.

[0146] Combination Figure 8 , taking the example that the first target time slot is not located in the RS resource pool.

[0147] 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, which is a time slot with a physical time slot number of 28. The first target time slot is not located in the RS resource pool, so the third time slot is determined as the time slot with a physical time slot number of 30 in the RS resource pool that is located after the time slot with a physical time slot number of 28 and is closest to it, that is, the time slot with a logical time slot number of 9 in the RS resource pool. At this time:

[0148] If K=0, 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 of 7 in the first frequency band is located in the time slot with the physical time slot number of 30 in the second frequency band, which can also be understood as the second resource used by the first RS indicated by the first SCI sent on the time slot with the logical time slot number of 2 in the SCI resource pool is located in the time slot with the logical time slot number of 9 in the RS resource pool;

[0149] If K=1, 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 of 7 in the first frequency band is located in the time slot with the physical time slot number of 33 in the second frequency band, which can also be understood as the second resource used by the first RS indicated by the first SCI sent on the time slot with the logical time slot number of 2 in the SCI resource pool is located in the time slot with the logical time slot number of 10 in the RS resource pool;

[0150] 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.

[0151] 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 the present application.

[0152] Based on the first implementation scheme, it can be ensured that the first RS will not be sent before the first SCI, and there will be no invalid indication. However, the second terminal receiving the first SCI needs a certain amount of time (also called time gap) to decode the first SCI. In order to avoid missing the reception of the first RS, the second terminal that needs to receive the first SCI must also receive the second frequency band in which the first RS is sent while decoding the first SCI, resulting in a large reception power consumption of the second terminal. For this reason, a second implementation scheme is proposed in which the first terminal determines the first time slot from the SCI resource pool.

[0153] Specifically, the second implementation scheme of the first terminal determining the first time slot from the SCI resource pool includes:

[0154] A first duration is reserved in time between the first SCI and the RS scheduled by it. For example, the first duration is represented by T pr o c1 , the T pr o c1 Corresponding to the Y time slots in the second frequency band, Formula 1 is updated to Formula 2:

[0155]

[0156] in, Indicates that the physical time slots in the second frequency band are numbered as The logical time slot number of the time slot (i.e., the third time slot) after the conversion from the time slot (also called the fourth time slot).

[0157] Among them, T pr o c1 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.

[0158] When implementing, T pr o c1 It may be (pre)configured, for example, configured by the second terminal to the first terminal, or configured by the first terminal high level, or predefined by the protocol. Optionally, the second terminal may report to the first terminal the capability of decoding the first SCI and / or the duration of opening / switching the RS receiving link.

[0159] It should be understood that under the second implementation scheme, there are also two situations for determining the third time slot:

[0160] 1) If the physical time slot number in the second frequency band is The fourth time slot is located in the RS 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 second frequency band of the first time slot;

[0161] 2) If the fourth time slot is not in the RS resource pool, at this time, 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.

[0162] Combination Fig. 9 , taking the fourth time slot located in the RS resource pool as an example.

[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 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, a 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.

[0164] Combination Fig. 9 , taking the example that the fourth time slot is not located in the RS resource pool.

[0165] 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 time slot of the first frequency band corresponds to the first target time slot of the second frequency band as the time slot with physical time slot number 0. If Y=5, the time slot with physical time slot number 5 (i.e., the fourth time slot) is obtained, and the fourth time slot is not located in the RS resource pool. Therefore, the time slot with physical time slot number 6 in the RS resource pool, which 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 the time slot with 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.

[0166] S702, the first terminal sends a first SCI on a first resource; correspondingly, the second terminal receives the first SCI on the first resource.

[0167] S703: The second terminal receives a first RS on a second resource based on an indication of the first SCI.

[0168] In this embodiment, when the first terminal sends the first SCI on the first resource, a parameter indicating K is carried in the first SCI, so that the second terminal can know the logical time slot offset used by the first terminal when indicating the scheduling of the second resource used by the first RS, thereby enabling the second terminal to 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.

[0169] For example, if we do not consider T pr o c1 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. The logical time slot number of the second time slot in the RS resource pool is determined, thereby determining the second time slot.

[0170] by Figure 8 Taking as an example, assuming K=0, 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 time, 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, which 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 9). 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 30.

[0171] For example, if we consider T pr o c1 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.

[0172] For example, Fig. 9For 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 time, 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.

[0173] For example, Fig. 9 For example, assuming K=1, Y=5, when the second terminal receives the first SCI sent by the first terminal in the time slot with physical time slot number 0 in the first frequency band, the second terminal obtains that at the same time, the time slot with physical time slot number 0 corresponds to the time slot with physical time slot number 0 in the second frequency band, 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. Therefore, 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).

[0174] In the implementation, for example, the first terminal and the second terminal may agree in advance whether to use Formula 1 or Formula 2, or the first terminal may send configuration information to the second terminal to indicate whether the second terminal determines based on Formula 1 or Formula 2. It is understandable that when Formula 2 is used, the first terminal and the second terminal have a certain relationship with T proc1 / Y has a unified understanding of the value, for example, the second terminal sends a message about T to the first terminal. proc1 Configuration information, or the first terminal determines T proc1 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.

[0175] 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.

[0176] Exemplarily, in order 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, that is, all time slots included in the SCI resource pool are only used to transmit 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 may be multiplexed by different terminals, indicating (or scheduling) RS resources in one or more time slots in the RS resource pool.

[0177] 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.

[0178] 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.

[0179] Solution 1: Fully adopt dynamic instructions

[0180] For example, the first SCI sent by the first terminal carries the first information, and the first information indicates the second resource occupied by the first terminal. For example, the content indicated by the first information includes at least one of the following: the index of the starting subchannel of the first RS and the number of subchannels occupied continuously, the index of the symbol group occupied by the first RS in a time slot, the index of the comb teeth occupied by the first RS in a time slot, and the index of the occupied resource pool.

[0181] Correspondingly, in this indication method, for the second terminal, the second resource in the second time slot is determined through the first information carried by the first SCI.

[0182] Solution 2: Configuration + dynamic indication

[0183] 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 configured with N2 SCI groups (also called SCI groups) and N2 RS groups (also called RS groups) in a single time slot, and the SCI in the n2th SCI group is configured to indicate the RS resources in the n2th RS group, and different RS groups correspond to different subchannels and / or different symbol groups and / or different comb teeth. Wherein, n2 is taken from 0 to N2-1.

[0184] 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.

[0185] For example, in one implementation, all RS resources in the RS group may be uniformly numbered (0, 1, ..., N3-1), and the first SCI carries the number index of the RS resources occupied by the first RS in the corresponding RS group. For another example, in another implementation, the first SCI may carry the starting subchannel index occupied by the first RS in the corresponding RS group and the number of subchannels continuously occupied by the first RS and / or the symbol group index and / or the comb index.

[0186] It should be understood that the configuration+dynamic indication method can reduce the overhead of the information carried by the first SCI.

[0187] Solution 3: Fully configure

[0188] For example, the SCI resource pool and the RS resource pool are configured to configure N2 SCI groups and N2 RS groups in a single time slot, each SCI group includes N3 SCI resource subgroups, each RS group includes N3 RS resources, and the SCI in the n3th SCI resource subgroup in the n2th SCI group indicates the n3th RS resource of the n2th RS group. n2 is taken from 0 to N2-1, and n3 is taken from 0 to N3-1.

[0189] 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 respectively in a single time slot, and the SCI in the n1th SCI resource subgroup is configured to schedule the n1th RS resource.

[0190] 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.

[0191] by Fig.10For example, SCI can be frequency-division / time-division multiplexed in one time slot, RS can be frequency-division / time-division / comb-division multiplexed in one time slot, N2 SCI groups are configured in each time slot of the SCI resource pool, each SCI group includes 4 sub-channels, 2 symbol groups, and a total of 8 SCI resources, and N2 RS groups are configured in the RS resource pool, each RS group includes 1 sub-channel, 2 symbol groups, 2 comb teeth, and a total of 4 RS resources. Among them, 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 sub-channel in the SCI resource pool and the number of PRBs included in each sub-channel in the RS resource pool can be different. 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 select the first RS in the SCI resource pool as follows: Fig.10 When the first SCI is sent within the dotted ellipse in the RS resource pool, the Fig.10 The 2nd RS resource in the N2th RS group.

[0192] 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.

[0193] However, in some cases, when the first SCI is sent in the first resource pool of the first frequency band and the first RS is sent in the second resource pool of the second frequency band, there may be a time slot for sending the first RS but no available time slot for sending the first SCI. For example, if the first resource pool is called the SCI resource pool, the second resource pool is called the RS resource pool, each time slot included in the SCI resource pool is called the SCI time slot, and each time slot included in the RS resource pool is called the RS time slot, such as Fig.11 As shown, assuming that 1 SCI time slot schedules at most 3 RS time slots, Fig.11 The time slot with logical time slot number 3 in the second frequency band still has RS resources that are not occupied by other terminals. However, the SCI time slots that can be used to indicate the 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 schedulable SCI time slots.

[0194] In view of this, the present application also provides another communication method to avoid the problem that there is no schedulable SCI time slot in the available RS time slot.

[0195] Next, an embodiment for preventing the situation where there are no schedulable SCI time slots in the available RS time slots is described.

[0196] 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.

[0197] 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 belongs to the resource pool, where k′=s mod L.

[0198] For example, if the influence of synchronization time slot, TDD downlink time slot, special time slot and reserved time slot is not considered, then Fig.11 In the example, 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).

[0199] 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 based on the bitmap of the SCI resource pool, instead of independently configuring the SCI resource pool and the RS resource pool.

[0200] 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 satisfy 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 a lagging indication.

[0201] For example, let Relevance Relevance Relevance in is the SCI time slot included in the SCI resource pool within one DFN cycle, The subscript in the lower right corner of each SCI time slot in represents the logical time slot number of the SCI time slot in the SCI resource pool. 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 situation of delayed indication, it is necessary to satisfy the SCI resource pool and the RS resource pool that for any x (x = 0, 1, ..., X-1), the SCI time slot The time at which the RS is located is not in the earliest RS time slot among the Z RS time slots associated with it The constraints afterwards.

[0202] 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.

[0203] For example, Fig.12 A schematic diagram of an SCI resource pool and an RS resource pool provided in this application. Fig.12 As shown, one SCI time slot is associated with two RS time slots, and each SCI time slot is not located before the first RS time slot associated with it.

[0204] For example, Fig.13 Another schematic diagram of an SCI resource pool and an RS resource pool provided in this application. Fig.13 As shown, one SCI time slot is associated with two RS time slots, and each SCI time slot is not located before the first RS time slot associated with it.

[0205] 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), 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, for example, T proc2 .

[0206] In specific implementation, the second duration is mainly related to the duration of decoding the first SCI by the second terminal and the duration of starting / switching the RS receiving link, and its unit can be s / ms / us. In one implementation, the second duration is based on a single time slot of the second frequency band where the first RS is located as the granularity, and the second duration is selected as P time slots of the second frequency band.

[0207] For example, Fig.14 A schematic diagram of an SCI resource pool and an RS resource pool provided in this application. Fig.14 As shown, 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 the Z time slots associated with it is at least greater than five physical time slots of the second frequency band.

[0208] It is to be noted that there are multiple forms of RS resource pool and SCI resource pool that satisfy the above constraint relationship or updated constraint conditions. Figure 12 to Figure 14 Just as an example.

[0209] As an optional embodiment, assuming 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:

[0210]

[0211] Where i=0,1,…,L1-1; z=0,1,…,Z-1.

[0212] Or to express it another way, 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,, i = 0,1,^,L1-1, z = 0,1,…,Z-1.

[0213] Optional. The default value of P is 0.

[0214] 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.

[0215] Exemplarily, the SCI resource pool adopts a subcarrier spacing of 30kHz, the RS resource pool adopts a subcarrier spacing of 120kHz, and one SCI time slot is configured to associate with two RS time slots, that is, Z=2. If P is not considered, that is, P=0, if the bitmap of the SCI resource pool has been configured to be 1001001010, then the bitmap of the RS resource pool can be directly determined to be (11000000000011...11000000), and the corresponding RS resource pool is as follows: Fig.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 as follows Fig.15 shown.

[0216] 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.

[0217] 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 available RS time slots having no schedulable SCI time slots by selecting SCI time slots associated with determined RS time slots to send SCI.

[0218] Therefore, in this embodiment, for the first terminal, when sending 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 sending the first SCI is the time slot associated with the second time slot to which the second resource belongs. In addition, it can also be understood that, since the SCI resource pool and the RS resource pool have the above association relationship, when the first terminal sends the first SCI, the problem of invalid indication and delayed indication is avoided.

[0219] 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.

[0220] Optionally, the number of RS resources in Z RS time slots = the number of RS resources in Z*1 RS time slot, wherein 1 RS resource can be understood as the minimum granularity of RS resource allocation, for example, 1 subchannel×1 symbol group×1 comb tooth.

[0221] In this configuration, Figure 7 Similar to the illustrated embodiment, the first terminal may further implement the indication of the RS second resource by the first SCI through dynamic indication and / or configuration.

[0222] One possible implementation is to use a fully dynamic indication method:

[0223] For example, during implementation, the first SCI not only carries information indicating which of the Z RS time slots it is associated with the currently scheduled second time slot, 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 tooth index, etc.

[0224] Another possible implementation is to use a fully configured approach:

[0225] 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 by the first SCI sent in the SCI time slot can be directly determined.

[0226] Another possible way is to combine dynamic indication with configuration:

[0227] 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 tooth 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 may 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 tooth index occupied continuously by the first RS. 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.

[0228] 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 scheduled by it in a single RS group.

[0229] For example, an example of a resource indication is as follows: Fig.16 As shown, Fig.16 One SCI time slot is associated with two RS time slots, one SCI time slot is divided into N2 SCI groups, two RS time slots are divided into N2 RS groups in total, the SCI in the n2th SCI group schedules the RS of the n2th RS group, and each SCI group / RS group includes 4 SCI / RS candidate resources. Whether using dynamic indication or configuration, it can be guaranteed that the available RS resources always have SCI resources that can schedule the RS.

[0230] The above respectively introduces the scheme provided by the present application on how to implement sending the first SCI on the first frequency band to indicate the time-frequency resources selected by the first RS sent on the 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 sent data signal are indicated by SCI.

[0231] 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 by the first data signal, and accordingly, the corresponding second resource pool is replaced by a resource pool configured for transmitting the data signal.

[0232] 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 a 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.

[0233] In addition, it should be noted that the above Fig.10 or Fig.16 The resource indication method shown can also be extended to the case where SCI and RS resources are frequency-division multiplexed in the same resource pool.

[0234] Exemplarily, all PRBs in a resource pool can be divided into two non-overlapping consecutive PRB sets, where one PRB set is used to send SCI and the other PRB set is used to send RS. The former includes N4 SCI resources, corresponding to N4 different RS resources respectively. 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, Fig.17 As shown, 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.

[0235] Combined with the above Figures 7 to 17 , describes in detail the communication method of the embodiment of the present application, and will now be combined with Fig.18 and Fig.19 The communication device provided by the present application is described in detail.

[0236] Fig.18 The structural diagram of a communication device provided by an embodiment of the present application is as follows. Fig.18 As shown, the device 1800 includes: a transceiver module 1801 and a processing module 1802 .

[0237] In a first embodiment, the communication device is applied to a first terminal that sends a first SCI.

[0238] 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 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, 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, 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.

[0239] 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.

[0240] In a 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 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;

[0241] 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.

[0242] In a possible implementation manner, the manner of acquiring the first duration includes at least one of the following: configured through signaling, configured by a high layer, or predefined by a protocol.

[0243] In a 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.

[0244] 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.

[0245] 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.

[0246] 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.

[0247] In a possible implementation manner, the second duration is obtained in at least one of the following ways: configured through signaling, configured by a high layer, or predefined by a protocol.

[0248] In a possible implementation, the second duration is P time slots in the second frequency band, where P is a positive integer.

[0249] In a possible implementation manner, the Z time slots associated with each time slot in the first resource pool are Z adjacent time slots on the second frequency band.

[0250] In a possible implementation, the length of the first bit map is L1, the length of the second bit map 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 bit map is 1, the j-th bit of the second bit map is 1, and j and i satisfy: j = (Mi + z + P) mod ML1, z = 0, 1, ..., Z-1.

[0251] 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.

[0252] 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 the ratio of the number of SCI resources included in each time slot in the first resource pool to Z.

[0253] In a possible implementation, 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.

[0254] 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.

[0255] In the second embodiment, the communication device is applied to a second terminal that receives a first SCI.

[0256] 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.

[0257] 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.

[0258] 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.

[0259] Fig.19 A structural schematic diagram of a communication device provided in another embodiment of the present application. Fig.19 The device shown can be used to execute the method described in any of the above embodiments.

[0260] like Fig.19As shown, the device 1900 of this embodiment includes: a memory 1901 and a processor 1902. Optionally, the device 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 through the bus 1904.

[0261] 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 used to execute the program. Figures 7 to 17 The individual steps of the method are shown.

[0262] The processor 1902 may be a general-purpose central processing unit (CPU), a microprocessor, an application specific integrated circuit (ASIC), or one or more integrated circuits for executing related programs to implement the present application. Figures 7 to 17 The method shown.

[0263] The processor 1902 may also be an integrated circuit chip having the ability to process signals. Figures 7 to 17 Each step of the method can be completed by an integrated logic circuit of hardware in the processor 1902 or an instruction in the form of software.

[0264] 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 methods, steps, and logic block diagrams disclosed in the embodiments of the present application may be implemented or executed. The general purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0265] The steps of the method disclosed in the embodiment of the present application can be directly embodied as being executed by a hardware decoding processor, or 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 completes the functions required to be executed by the units included in the device of the present application in combination with its hardware. For example, it can execute Figures 7 to 17 The various steps / functions of the illustrated embodiment.

[0266] 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.

[0267] 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 ).

[0268] It should be understood that the device 1900 shown in the embodiment of the present application may be an electronic device, or may be a chip configured in an electronic device. The device 1900 may be deployed in a terminal device, or may be deployed in a network device.

[0269] The above embodiments can be implemented in whole or in part by software, hardware, firmware or any other combination. When implemented by 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 programs 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 site, computer, server or data center to another website site, computer, server or data center by wired (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that a computer can access 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 hard disk.

[0270] It should be understood that the term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship, but it may also indicate an "and / or" relationship. Please refer to the context for specific understanding.

[0271] In this application, "at least one" means one or more, and "more than one" 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 be represented by: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple.

[0272] 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.

[0273] Those of ordinary skill 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 to be beyond the scope of this application.

[0274] Those skilled in the art can 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.

[0275] In the several embodiments provided in the present 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 only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, 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.

[0276] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0277] 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.

[0278] 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 can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the various embodiments 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.

[0279] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

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.

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