WO2021143955A1 - Resource selection method for secondary link communication, and communication device - Google Patents

Abstract

Provided in embodiments of the present application are a resource selection method for secondary link communication, and a communication device. In NR V2X communication, a first terminal device selects Y slots from within the resource selection window and determines, using that time slot among the Y time slots having the smallest time slot sequence number, a time slot offset, then determines the initial time domain position of the resource sensing window; sensing is then performed with respect to each resource in the resource sensing window and, according to the sensing result, time-frequency resources which may be occupied by the second terminal device in the Y time slots are predicted; finally, time-frequency resources for secondary link communication are selected from among the time-frequency resources not occupied by the second terminal device in the Y time slots. By means of predicting whether selected time-frequency resources are not periodically occupied by other terminal devices, resource collision is avoided, and the purpose of improving the success rate of secondary link data transmissions is achieved.

Description

Resource selection method and communication device for auxiliary link communication

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office, the application number is CN202010048219.4, and the application name is "Resource Selection Method and Communication Device for Auxiliary Link Communication" on January 16, 2020. The entire content of the application is approved The reference is incorporated in this application.

Technical field

The embodiments of the present application relate to the field of communication technologies, and in particular, to a resource selection method and communication device for auxiliary link communication.

Background technique

Vehicle-to-X (V2X) communication is a key technical direction of the 16th (Release 16, R16) protocol. NR V2X, as an enhancement of Long Term Evolution (LTE) V2X, enables the Internet of Vehicles Key technical means.

In V2X communication, V2X devices perform auxiliary link communication through a sidelink. For V2X communication, there are two resource allocation methods. The first method is scheduled resource allocation. In this method, the base station configures resources for the V2X device for auxiliary link communication. This method is mainly used Mode 3 in LTE V2X communication and mode 1 in NR V2X communication; the second method is a resource selection method based on perception, which does not require base stations to schedule resources. This method is mainly used in LTE V2X communication Mode4 and mode2 in NR V2X communication. Among them, from the perspective of the perception range, the perception-based resource selection method can be further divided into a full perception method and a partial sensing method. The current local sensing method is mainly used in LTE V2X communication. In this manner, the V2X device selects Y subframes in the resource selection window, and for each subframe y of the Y subframes, multiple sensing subframes are determined, and based on the sensing subframes, it is judged whether the resources on the subframe y are available. Compared with the global sensing method, the local sensing method greatly reduces the number of subframes that need to be sensed by the V2X device.

In LTE V2X communication, the business between V2X devices is a periodic service. Therefore, based on the above-mentioned local sensing method, the V2X device can determine whether there are other V2X devices on the selected subframe according to the resource reservation on the sensing subframe That is, the V2X device can determine the auxiliary link communication resources reserved by other V2X devices for periodic services. However, non-periodic services are introduced in NR V2X communication. At this time, if the above-mentioned local resource sensing method continues to be used, the V2X device cannot determine whether the subframe y is a resource reserved by other V2X devices for aperiodic services. The resources selected by the V2X device are likely to be resources reserved by other V2X devices for non-periodic services, causing resource collisions, and thus causing the V2X device to fail to send data successfully.

Summary of the invention

The embodiments of the present application provide a method and communication device for selecting resources for auxiliary link communication. The first terminal device determines the resources reserved by other V2X devices for non-periodic services to avoid resource collisions and improve the success of auxiliary link data transmission. The purpose of the rate.

In the first aspect, an embodiment of the present application provides a resource selection method for auxiliary link communication, including:

The first terminal device determines a time slot offset, where the time slot offset is used to indicate the offset of the starting time domain position of the resource sensing window with respect to the position of the time slot with the smallest time slot sequence number, where the time slot sequence number is the smallest The time slots of is included in Y time slots, the Y time slots are selected by the first terminal device from the resource selection window, and the Y is greater than or equal to a preset threshold;

Determining, by the first terminal device, a resource perception window, and the time domain start position of the resource perception window is determined by the first terminal device using the time slot with the smallest time slot sequence number and the time slot offset;

The first terminal device uses the sensing result of each resource in the resource sensing window to predict the time-frequency resources in the Y time slots that are non-periodically occupied by the second terminal device;

The first terminal device selects time-frequency resources used for secondary link communication from the time-frequency resources in the Y time slots that are not occupied by the second terminal device.

In a feasible design, the time slot offset is a physical time slot offset, and the physical time slot offset is X×2 ^μ , wherein the X is configured or pre-configured by the network side device, and the μ Related to sub-carrier spacing;

The starting time domain position of the resource sensing window is the starting position of the time slot min( _ty )-X×2 ^μ , where the min( _ty ) represents the smallest physical time in the Y time slots Slot number

The end time domain position of the resource perception window is nt _proc,0 , the n is the moment when the first terminal device triggers resource selection, and the t _proc,0 represents the perception processing duration of the first terminal device .

In a feasible design, the time slot offset is a logical time slot offset, and the logical time slot offset is X', and the X'indicates that the new wireless car and everything NR V2X communication has a pre-transmission block TB. The maximum logical time slot interval between multiple transmissions reserved;

The starting time domain position of the resource sensing window is the starting position of the physical time slot t _ymin-X' , where the ymin represents the smallest logical time slot sequence number among the Y time slots, and the smallest logical time The physical time slot sequence number corresponding to the slot sequence number is marked as t _ymin , and the ymin-X′ represents the logical time slot sequence number offset by X′ from ymin.

In a feasible design, the above method also includes:

The first terminal device determines whether time n is included in the secondary link resource pool, the time slot in the secondary link resource pool is a time slot used for secondary link communication, and the n is the first terminal device At the time when resource selection is triggered, if t _{n is} included in the secondary link resource pool, the first terminal device determines that the end time domain position of the resource sensing window is time slot t _n-1 , and t _n Is the sequence number of the physical time slot at the time n;

If the time slot t _{n is} not included in the secondary link resource pool, the first terminal device determines that the end time domain position of the resource sensing window is the time slot t _m-1 , and the time slot t _m It is the time slot closest to _{the time slot t n} and located after the time _{slot t n} in the secondary link resource pool.

In a feasible design, the above method also includes:

The first terminal device determines the sensing time slot corresponding to the _{time slot t y}

The time slot t _y is any one of the Y time slots, the μ is related to the subcarrier interval, and the _m is a periodic service service supported by the network according to the carrier type and the auxiliary link resource pool Periodically configured

The first terminal device uses each sensing time slot

And predict the time-frequency resources occupied by the second terminal device in the Y time slots.

In a feasible design, when the carrier type indicates that the secondary link carrier is an intelligent transportation system ITS dedicated carrier or a frequency division duplex FDD shared carrier, the _{value set of m} and the secondary link resource pool support The business cycle of periodic business is the same.

In a feasible design, when the carrier type indicates that the secondary link carrier is a shared carrier of frequency division duplex TDD, the _{value set of m} is related to the service period of the periodic service supported by the secondary link resource pool United.

In a second aspect, an embodiment of the present application provides a communication device, including:

The first determining module is configured to determine a time slot offset, where the time slot offset is used to indicate the offset of the starting time domain position of the resource sensing window with respect to the position of the time slot with the smallest time slot sequence number. The time slot with the smallest slot number is included in Y time slots, the Y time slots are selected by the first terminal device from the resource selection window, and the Y is greater than or equal to a preset threshold;

A second determining module, configured to determine a resource sensing window, the time domain starting position of the resource sensing window is determined by the first terminal device using the time slot with the smallest time slot sequence number and the time slot offset;

A prediction module, configured to use the sensing result of each resource in the resource sensing window to predict the time-frequency resources non-periodically occupied by the second terminal device in the Y time slots;

The selection module is configured to select time-frequency resources used for auxiliary link communication from the time-frequency resources not occupied by the second terminal device in the Y time slots.

In a feasible design, the time slot offset is a physical time slot offset, and the physical time slot offset is X×2 ^μ , wherein the X is configured or pre-configured by the network side device, and the μ Related to sub-carrier spacing;

The starting time domain position of the resource sensing window is the starting position of the time slot min( _ty )-X×2 ^μ , where the min( _ty ) represents the smallest physical time in the Y time slots Slot number

The end time domain position of the resource perception window is nt _proc,0 , the n is the moment when the first terminal device triggers resource selection, and the t _proc,0 represents the perception processing duration of the first terminal device .

In a feasible design, the time slot offset is a logical time slot offset, the logical time slot offset is X', and the X'represents multiple transmissions reserved for a transmission block TB by NR V2X communication The maximum logical time slot interval between

The starting time domain position of the resource sensing window is the starting position of the physical time slot t _ymin-X' , where the ymin represents the smallest logical time slot sequence number among the Y time slots, and the smallest logical time The physical time slot sequence number corresponding to the slot sequence number is marked as t _ymin , and the ymin-X′ represents the logical time slot sequence number offset by X′ from ymin.

In a feasible design, the above-mentioned device further includes:

The third determining module is configured to determine whether time n is included in the secondary link resource pool, the time slot in the secondary link resource pool is the time slot used for secondary link communication, and the n is the first terminal At the time when the device triggers resource selection, if t _{n is} included in the secondary link resource pool, the first terminal device determines that the end time domain position of the resource sensing window is the time slot t _n-1 , and t _n is the sequence number of the physical time slot at the time n. If the time slot t _{n is} not included in the secondary link resource pool, the end time domain position of the resource sensing window is determined to be the time slot t _m-1 The time slot t _m is the time slot closest to _{the time slot t n} and located after the time _{slot t n} in the secondary link resource pool.

In a feasible design, the above-mentioned device further includes:

The fourth determining module is used to determine the sensing time slot corresponding to the _{time slot t y}

The time slot t _y is any one of the Y time slots, the μ is related to the subcarrier interval, and the _m is a periodic service service supported by the network according to the carrier type and the auxiliary link resource pool Periodically configured

The prediction module is also used to use each sensing time slot

And predict the time-frequency resources occupied by the second terminal device in the Y time slots.

In a feasible design, when the carrier type indicates that the secondary link carrier is an intelligent transportation system ITS dedicated carrier or a frequency division duplex FDD shared carrier, the _{value set of m} and the secondary link resource pool support The business cycle of periodic business is the same.

In a feasible design, when the carrier type indicates that the secondary link carrier is a shared carrier of frequency division duplex TDD, the _{value set of m} is related to the service period of the periodic service supported by the secondary link resource pool United.

In a third aspect, an embodiment of the present application provides an electronic device, including a processor, a memory, and a computer program stored on the memory and capable of running on the processor. When the processor executes the program, the electronic device The device implements the method in the above first aspect or various possible implementation manners of the first aspect.

In a fourth aspect, the embodiments of the present application provide a computer program product containing instructions, which when run on an electronic device, cause the electronic device computer to execute the above-mentioned method in the first aspect or various possible implementation manners of the first aspect .

In a fifth aspect, an embodiment of the present application provides a readable storage medium that stores instructions in the readable storage medium, which when run on an electronic device, causes the electronic device to execute the above-mentioned first aspect or the first aspect. Methods in various possible implementations.

In the resource selection method and communication device for auxiliary link communication provided in the embodiments of the present application, in NR V2X communication, the first terminal device selects Y time slots from the resource selection window, and uses the smallest time slot sequence number among the Y time slots Determine a time slot offset according to the time slot offset, and offset the time slot with the smallest time slot sequence number according to the time slot offset to obtain the starting time domain position of the resource perception window. Perform sensing, predict the time-frequency resources that may be occupied by the second terminal device in the Y time slots according to the sensing results, and finally, select the time-frequency resources that are not occupied by the second terminal device in the Y time slots for the secondary link Time-frequency resources for communication. With this scheme, the starting time domain position of the resource sensing window is determined by the first terminal device according to the time slot with the smallest time slot sequence number and the time slot offset, and the time slot offset is the difference between aperiodic data and the same TB The maximum reservation interval, the second terminal device perceives each resource in the resource sensing window, so it can predict all the time-frequency resources that may be reserved non-periodically by the second terminal device in the Y time slots, and then from the remaining unreserved The second terminal device selects the time-frequency resource used for the auxiliary link communication from the time-frequency resources non-periodically occupied by the second terminal device to avoid resource collisions and achieve the purpose of improving the success rate of auxiliary link data transmission.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor.

Fig. 1A is a schematic diagram of a global sensing method in LTE V2X communication;

Fig. 1B is a schematic diagram of a local sensing method in LTE V2X communication;

2A is a schematic diagram of a network architecture to which the method for selecting communication resources of a secondary link provided by an embodiment of the present application is applicable;

2B is a schematic diagram of a network architecture to which the method for selecting communication resources of a secondary link provided by an embodiment of the present application is applicable;

FIG. 3 is a flowchart of a method for selecting resources for auxiliary link communication according to an embodiment of the present application;

FIG. 4 is a schematic diagram of a resource selection method for auxiliary link communication provided by an embodiment of the present application;

FIG. 5 is a schematic diagram of another method for selecting resources for auxiliary link communication provided by an embodiment of the present application;

FIG. 6 is a schematic structural diagram of a communication device provided by an embodiment of this application;

FIG. 7 is a schematic structural diagram of a communication device provided by an embodiment of this application;

FIG. 8 is a schematic structural diagram of another communication device provided by an embodiment of the present application;

FIG. 9 is a schematic structural diagram of an electronic device provided by an embodiment of the application.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

In V2X communication, from the perspective of whether network equipment is required to be scheduled through high-level signaling, resource allocation methods are divided into scheduling resource allocation methods and perception-based resource selection methods. From the perspective of perception range, the perception-based resource selection method is divided into a full perception method and a partial sensing method. The local perception method can also be referred to as a partial sensing method. In the following, taking LTE V2X communication as an example, the global sensing method and the local sensing method will be described in detail.

First, the global perception method in LTE V2X communication.

The V2X device eliminates the resources that may be occupied by other V2X devices in the resource selection window through the sensing results of the resource perception window, selects time-frequency resources for auxiliary link communication from the remaining available resources, and performs periodic resource reservations . When the V2X device needs to use the auxiliary link resource again, it directly performs data transmission on the reserved resource without needing to perform resource selection again. In this process, the V2X device needs to perceive each resource in the entire resource perception window to predict the resources that may be occupied by other V2X devices in the resource selection window based on the perception result. Exemplarily, refer to FIG. 1A, which is a schematic diagram of a global sensing method in LTE V2X communication.

1A, V2X device 4 triggers resource selection at time n, assuming that the resource perception window is [n-1000, n], the resource selection window is [n+T1, n+T2], and V2X device 4 is in the resource perception window Perceive all the resources of the device, and predict the resources that may be occupied by V2X device 1 to V2X device 3 in the resource selection window according to the sensing result. When performing auxiliary link communication subsequently, select the time for auxiliary link communication from the remaining resources Frequency resources are reserved periodically.

Secondly, the local sensing method in LTE V2X communication.

Compared with the global perception method, having the perception method does not need to perceive the resources in the entire resource perception window, but perceives some discrete resources. For example, refer to FIG. 1B, which is a schematic diagram of a local sensing method in LTE V2X communication.

1B, the V2X device triggers resource selection at time n. Assuming that the resource selection window is [n+T1, n+T2], the V2X device selects Y subframes in the resource selection window. For the yth subframe of the Y subframes Subframes t _y , determine the corresponding perception subframe

Among them, the value range of k is a natural number from 1 to 10, and P _step is configured or pre-configured by the network side device, and the network side device is, for example, the gNB in NR. As shown in Figure 1B, suppose that the V2X device selects three subframes in the resource selection window, marked as y1, y2, and y3, respectively, as indicated by the solid arrows, dashed arrows, and dotted arrows in the resource selection window. As shown, the sensing sub-frames corresponding to the three sub-frames are shown as solid arrows, dashed arrows, and dotted arrows outside the resource selection window in the figure. For the subframe y1, the V2X device only needs to predict whether the subframe y1 is occupied by other V2X devices according to the sensing subframe corresponding to the subframe y1, that is, the sensing results of the resources shown by the solid arrows outside the resource selection window; subframe y2 The prediction process of the subframe y3 is the same as the prediction process of the subframe y1. It can be seen that, compared with the global sensing method, the local sensing method greatly reduces the number of sub-frames that need to be sensed by the V2X device.

In LTE V2X communication, the business between V2X devices is a periodic service. Therefore, based on the above-mentioned local sensing method, the V2X device can determine whether the selected subframe is connected to other V2X devices based on the resource reservation on the sensing subframe. Reserved resources. However, non-periodic services are introduced in NR V2X communication. At this time, if the above-mentioned local resource sensing method continues to be used, the V2X device cannot determine whether the subframe y is a resource reserved by other V2X devices for aperiodic services. The resources selected by the V2X device are likely to be resources reserved by other V2X devices for non-periodic services, causing resource collisions, and thus causing the V2X device to fail to send data successfully.

In view of this, an embodiment of the present application provides a method for selecting resources for auxiliary link communication. The first terminal device determines resources reserved by other V2X devices for non-periodic services to avoid resource collisions and achieve improved auxiliary link data transmission. The purpose of success rate.

First, the terms involved in the embodiments of the present application are explained.

The first terminal device needs resources for auxiliary link communication, such as a terminal device that needs to send data or receive data through the auxiliary link.

The second terminal device is a terminal device that is likely to have a resource collision with the first terminal device. There is a reserved resource for the second terminal device in the resource selection window, and the reserved resource is reserved for multiple transmissions of one TB If the first terminal device selects the reserved resource for auxiliary link communication, a resource collision occurs.

FIG. 2A is a schematic diagram of a network architecture to which the method for selecting communication resources of a secondary link provided by an embodiment of the present application is applicable. Referring to FIG. 2A, the network architecture includes a first terminal device and at least one second terminal device. Among them, both the first terminal device and the second terminal device can use the sidelink to communicate. The auxiliary link can also be called a direct link, a unilateral link, etc., and the auxiliary link communication can also be called a direct link. Communication etc. For example, the first terminal device may communicate with any second terminal device through the auxiliary link; for another example, each second terminal device may communicate with each other through the auxiliary link. Both the first terminal device and the second terminal device can apply resources in the secondary link resource pool.

Figure 2B is a method for selecting auxiliary link communication resources provided by an embodiment of the present application. V2X communication includes vehicle-to-vehicle (V2V) communication, and vehicle to roadside infrastructure (V2I). Communication between vehicles, vehicle to pedestrian (V2P), vehicle to network (V2N), etc. The above-mentioned vehicle-to-everything communication is collectively referred to as V2X (X stands for anything) Communication. The first terminal device is, for example, any one of a vehicle, a pedestrian terminal device, a road side unit (Road Side Unit, RSU), etc., and the second terminal device is a vehicle, a pedestrian terminal device, or a road side unit (Road Side Unit, RSU). ), etc.

Hereinafter, based on the above-mentioned noun explanation and the network architecture shown in FIG. 2A and FIG. 2B, the resource selection method of the auxiliary link communication according to the embodiment of the present application will be described in detail. For example, see Figure 3. Fig. 3 is a flowchart of a method for selecting resources for auxiliary link communication provided by an embodiment of this application, and this embodiment includes:

101. The first terminal device determines a time slot offset.

Wherein, the time slot offset is used to indicate the offset of the starting time domain position of the resource sensing window relative to the position of the time slot with the smallest time slot sequence number, and the time slot with the smallest time slot sequence number is included in Y time slots. In the slot, the Y time slots are selected by the first terminal device from the resource selection window, and the Y is greater than or equal to a preset threshold.

Exemplarily, one or more secondary link resource pools are configured or pre-configured on the network side device, and each secondary link resource pool can be reserved periodically or non-periodically. For one or more secondary link resources Any secondary link resource pool in the pool is referred to as the target resource pool below. If the network side device configures or preconfigures the target resource pool for periodic resource reservation, the resource reservation that the first terminal device needs to sense includes There are two types of periodic reservation and aperiodic reservation; if the network configuration target resource pool cannot perform periodic resource reservation, the resources that the first terminal device needs to sense include only aperiodic reservation.

When the first terminal device perceives the aperiodic reservation process, the first terminal device selects resources at time n, and determines from the target resource pool at time n that the starting time domain position of the resource selection window is n+T1, and the resource selection The end time domain position of the window is n+T2, the resource selection window can be marked as [n+T1, n+T2], the value of T1 and T2 depends on the realization of the first terminal device, such as T1≤4 milliseconds (ms) , 20ms≤T2≤100ms. Then, the first terminal device selects Y time slots in the resource selection window, where Y is greater than or equal to a preset threshold, and the preset threshold can be flexibly set. After selecting Y time slots, the first terminal device determines a time slot offset according to the Y time slots. Wherein, the condition that triggers the first terminal device to perform resource selection can be flexibly set, for example, the first terminal needs to send or receive data around, but there is no available resource around the first terminal. The Y time slots are selected by the first terminal device from the resource selection window, and the selection rule depends on the implementation of the user.

102. The first terminal device determines a resource perception window, and the time domain start position of the resource perception window is determined by the first terminal device using the time slot with the smallest time slot sequence number and the time slot offset .

Exemplarily, after selecting Y time slots from the resource selection window, the first terminal determines the time slot with the smallest time slot sequence number from the Y time slots, and on the time axis, according to the offset value for the time slot The time slot with the smallest sequence number is offset, and the offset direction is the opposite direction of the positive extension direction of the time axis. That is to say, relative to the time n when the first terminal device triggers resource selection, the time period in which the resource perception window is located is a past one. Time period, a time period in the future where the resource selection window is located.

In the embodiment of the present application, since the starting time domain position of the resource sensing window is determined according to the time slot with the smallest time slot sequence number and the time slot offset, the time slot offset includes the maximum prediction of aperiodic data for the same TB. The interval is reserved, so that any time slot in the resource sensing window may reserve the time slot with the smallest time slot sequence number as a non-periodical reserved resource. Therefore, by sensing each time slot in the resource sensing window, it can be determined whether the time slot with the smallest time slot sequence number among the Y time slots is used as a non-periodically reserved resource by other second terminal equipment. For the other time slots in the Y time slots (hereinafter referred to as yx), the starting time domain position of the resource sensing window is offset to the positive direction of the time axis, and the offset is the time slot offset to obtain a A new resource perception window. Any time slot in the new resource perception window may reserve slot yx as a non-periodical reserved resource. The part of the resource in the new resource perception window is based on the minimum slot sequence number. The determined resource perception window has an intersection, and the part outside the intersection is located in the resource selection window. Therefore, it can be concluded that when resource selection is performed at time n, it is only necessary to perceive each time slot in the resource sensing window determined according to the minimum time slot sequence number to determine whether each of the Y time slots is Used by other second terminal devices as non-periodically reserved resources.

Moreover, in the embodiment of the present application, the time slot may be a logical time slot or a physical time slot. When the time slot is a logical time slot, the logical time slot offset takes, for example, the maximum value, such as 32 logical time slots, which may be converted to a physical time slot of 100 physical time slots. Whether it is a physical time slot or a logical time slot, the resource sensing window is determined according to the time slot with the smallest time slot sequence number, and each time slot in the resource sensing window is sensed, and each time slot in the Y time slots can be judged Whether it is used as a reserved resource by other second terminal devices.

103. The first terminal device uses the sensing result of each resource in the resource sensing window to predict the time-frequency resources in the Y time slots that are non-periodically occupied by the second terminal device.

The first terminal device perceives each resource in the resource perception window to determine whether the time-frequency resources in the Y time slots pre-selected by the first terminal device are occupied by the second terminal device in the resource selection window, that is, from Y Among the time slots, it is determined that the second terminal device may be a resource used for aperiodic services, where there is at least one second terminal device. Exemplarily, refer to FIG. 4, which is a schematic diagram of a resource selection method for auxiliary link communication according to an embodiment of the present application.

Referring to FIG. 4, the granularity of the time domain is a slot (slot), and the granularity of the frequency domain is a subchannel (subchannel). A subchannel includes m resource blocks (RB), and m is configured by a higher layer. The Y time slots include time slot y1, time slot y2, and time slot y3. For any time slot, such as time slot y1, the first terminal device determines whether the time-frequency resource on the time slot is based on the sensing result in the resource sensing window Reserved aperiodically. For example, the first terminal device _{perceives the first transmission of a TB from a second terminal in the time slot t n-3} , and reserves resources for the second transmission of the TB. In the time slot t _y1 , As shown in the dotted part in the figure; the first terminal _{senses the first transmission of a TB sent by another second terminal device in the time slot t n-1} , and reserves the second transmission of the TB at the same time. Resources, in the time slot t _y2 , as shown in the slash-filled part in the figure; the first terminal excludes these two non-periodically reserved resources, and selects from the remaining time-frequency resources that are not periodically occupied The time-frequency resource used for the auxiliary link communication, such as _{selecting an unoccupied time-frequency resource on the time slot t y1} , as shown in the vertical line filling part in the figure. The selected time-frequency resource used for auxiliary link communication occupies one slot in the time domain, and occupies multiple consecutive subchannels in the frequency domain.

104. The first terminal device selects a time-frequency resource used for secondary link communication from the time-frequency resources that are not occupied by the second terminal device in the Y time slots.

In the above step 103, the first terminal device predicts the time-frequency resources that may be occupied by other terminal devices in the resource selection window. In this step, the first terminal device selects the time-frequency resources used for the auxiliary link communication from the remaining time-frequency resources. Time-frequency resources.

In the resource selection method for secondary link communication provided by the embodiment of the application, in NR V2X communication, the first terminal device selects Y time slots from the resource selection window, and uses the time slot with the smallest time slot sequence number among the Y time slots Determine a time slot offset, offset the time slot with the smallest time slot sequence number according to the time slot offset, obtain the starting time domain position of the resource sensing window, and then sense each resource in the resource sensing window, According to the sensing results, predict the time-frequency resources that may be occupied by the second terminal device in the Y time slots, and finally, select the time-frequency resources for the secondary link communication from the time-frequency resources that are not occupied by the second terminal device in the Y time slots. Frequency resources. With this scheme, because the starting time domain position of the resource sensing window is determined by the first terminal device according to the time slot with the smallest time slot sequence number and the time slot offset, and the time slot offset includes the non-periodic data to the same TB The maximum reservation interval. The second terminal device perceives each resource in the resource perception window, and can predict all the time-frequency resources that may be reserved non-periodically by the second terminal device in the Y time slots, and then from the remaining unreserved The second terminal device selects the time-frequency resource used for the auxiliary link communication from the time-frequency resources non-periodically occupied by the second terminal device to avoid resource collisions and achieve the purpose of improving the success rate of auxiliary link data transmission.

In the foregoing embodiment, the time slot may be a physical time slot or a logical time slot. The two cases will be described in detail below.

First, the slot offset is the physical slot offset.

In this case, the resource perception window and the resource selection window are marked with physical time slots, and the time slot offset is represented by the physical time slot offset as X×2 ^μ , where the X is configured or pre-configured by the network side device, so The μ is related to the subcarrier interval; the starting time domain position of the resource sensing window is the starting position of the time slot min( _ty )-X×2 ^μ , where the min( _ty ) represents the Y time The smallest physical time slot sequence number in the slot; the end time domain position of the resource perception window is nt _proc,0 , where n is the moment when the first terminal device triggers resource selection, and the t _proc,0 represents the first The duration of perception processing of a terminal device.

Exemplarily, when the first terminal device selects resources at time n, the resource selection window is marked as [n+T1, n+T2], and the first terminal device selects Y physical time slots (slots) in the resource selection window , The slot position of the y-th slot in the Y slots is marked as t _y . The first terminal device determines a resource perception window according to the Y time slots. The resource perception window is marked as [min(t _y )-X×2 ^μ ,t _proc,0 ], which represents the start time of the resource perception window The domain position is the start position of the time slot min(t _y )-X×2 ^μ , and the end time domain position of the resource perception window is nt _proc,0 . Wherein, min( _ty ) represents the physical time slot sequence number of the time slot with the smallest time slot sequence number.

Fig. 5 is a schematic diagram of a resource selection method for auxiliary link communication provided by an embodiment of the present application. Please refer to Figure 5, when the physical time slot offset is adopted, each time slot is labeled from time slot 0 according to the System Frame Number (SFN), and no time slot is skipped. The first terminal device triggers at time n To perform resource selection or reselection, the physical time slot at time n is marked as t _n , and the resource selection window is marked as [n+T1, n+T2]. Assuming that the network configuration target resource pool can perform periodic resource reservation and aperiodic reservation, the subcarrier interval is 15kHz, that is, the length of a time slot is 1ms, at this time, the resource reservation that the first terminal device needs to sense includes the period Sexual reservation and non-periodical reservation. For the perception of aperiodic reservations, suppose that the first terminal device selects 3 time slots in the resource selection window, and the physical time slot serial numbers are marked as t _y1 , t _y2 , and t _y3 , and the first terminal device will perceive others The resource reservation information of the second terminal device selects appropriate time-frequency resources on the three time slots for auxiliary link communication.

During the sensing process, the first terminal device determines the starting time domain position of the resource sensing window according to the selected three time slots. The method of determination is: the first terminal device determines the time slot sequence number with the smallest physical time slot sequence number _{from t y1} , t _y2 , and _ty3 ^{, and subtracts a physical time slot offset X×2 μ from the smallest time slot sequence number.} , You can get the starting time domain position of the resource perception window. Among them, the physical time slot offset X×2 ^μ is the number of physical time slots converted by the first terminal device according to the sub-carrier interval, and μ is related to the sub-carrier interval, which can be queried from Table 1.

Table 1

μ	Δf=2 μ ·15[kHz]	Cyclic prefix
0	15	Normal (Nromal)
1	30	Normal (Nromal)
2	60	Normal (Nromal), extended (Extended)
3	120	Normal (Nromal)

Assuming that t _y1 is the physical time slot with the smallest physical time slot sequence number, X = 100, and the sub-carrier spacing is 15 kHz, the query table 1 can get μ = 0. At this time, X×2 ^μ = 100, the first terminal device determines to obtain The start time domain position of the resource perception window of the aperiodic resource reservation information is t _y1 -100. If the sensing processing duration of the first terminal device is t _proc,0 , the resource sensing window can be marked as [t _y1 -100,nt _proc,0 ), as shown by the gray rectangular box in the figure. It should be noted that the value of X is not limited to 100. In other feasible implementation manners, it may also be other values, etc. The specific selection depends on the configuration or pre-configuration of the network device.

After determining the resource perception window, the first terminal device perceives each resource in the resource perception window and obtains the perception result. According to the perception result, it is determined that the physical time slots t _y1 , t _y2 , and t _y3 may be used by the second terminal device The reserved aperiodic resources, and then select the time-frequency resources used for the auxiliary link communication from the resources non-periodically reserved by the second terminal device. It should be noted that if the target resource pool is configured to be periodically reserved, the first terminal device also needs to exclude the resources periodically reserved by the second terminal device _{from t y1} , t _y2 , and t _y3.

With this solution, the Y time slots selected by the first terminal device are Y physical time slots, so that the first terminal device determines the resource perception window according to the physical time slot sequence number.

Second, the slot offset is a logical slot offset.

In this case, the logical time slot is the time slot that can be used for the auxiliary link in the physical time slot, excluding the downlink time slot, and the time slot offset is the logical time slot offset. When marking the resource perception window and resource selection window, it is required Convert logical time slots to physical time slots. Let the time slot offset be X', X'represents the maximum interval between multiple transmissions reserved for a transmission block TB in NR V2X communication. At this time, the starting time domain position of the resource sensing window is the starting position of the time slot t _ymin-X' , where the ymin represents the smallest logical time slot sequence number among the Y time slots, and the smallest logical time slot sequence number corresponds to The physical time slot sequence number of is marked as t _ymin , and the ymin-X' represents the logical time slot sequence number offset by X'from ymin. Assuming that the first terminal device selects 3 logical time slots in the resource selection window, the time slot serial numbers of the physical time slots corresponding to the 3 logical time slots are marked as t _y1 , t _y2 , and t _y3 , and t _y1 is The physical time slot sequence number corresponding to the logical time slot with the smallest logical time slot sequence number among the three logical time slots. When X'takes the value 32, that is, when _{X'represents 32 logical time slots, then t ymin-X'} = t _{y1 -32} , indicating that the starting time domain position of the resource sensing window is the starting position of the physical time slot where _{t y1-32 is located.}

In addition, when using logical time slots, the first terminal device determines the end time position of the resource perception window. In addition to continuing to use the above nt _porc,0 , it can also determine the end time position of the resource perception window according to other methods. . In other manners, the first terminal device determines whether time n is included in the secondary link resource pool, the time slot in the secondary link resource pool is the time slot used for secondary link communication, and the n is the first When the terminal device triggers resource selection, if t _{n is} included in the secondary link resource pool, the first terminal device determines that the end time domain position of the resource sensing window is the time slot t _n-1 , and t _n is the sequence number of the physical time slot at the time n; if the time slot t _{n is} not included in the secondary link resource pool, the first terminal device determines the end time domain position of the resource sensing window Is the time slot t _m-1 , and the time slot t _m is the time slot closest to the time slot t _n and located after the time _{slot t n in the preset secondary link time slot set.}

Exemplarily, the first terminal device triggers resource selection or resource renewal at time _n , the sequence number of the physical time slot at time n is marked as t n, and the first terminal device determines whether time n is included in the secondary link resource pool, and the secondary chain The path resource pool is the aforementioned target resource pool. If t _{n is} included in the secondary link resource pool, the first terminal device determines that the end time domain position of the resource sensing window is the time slot t _n-1 , if t _n when the auxiliary link is not included in the resource pool, the resource pool from the auxiliary link defining a physical slot t _m, t _m is the time slot resource pool from the auxiliary link slot t _n recently, and is located Time slot after slot _{t n.} Then, use this physical time slot t _m-1 as the end time domain position of the resource perception window.

With this solution, since the starting position of the resource sensing window is Y time slots selected by the first terminal device are Y logical time slots, the purpose of determining the resource sensing window by the first terminal device according to the logical time slot sequence number is realized.

It should be noted that, in the above-mentioned embodiments, the first terminal device perceives the aperiodic reserved resources as an example to describe this application in detail. However, the embodiments of the present application are not limited to this. In other feasible implementation manners, the first terminal device can also sense the resources periodically reserved by the second terminal device. In this case, the first terminal device senses resources in addition to sensing resources. In addition to each resource in the window, it is also necessary to perceive a group of time slots outside the perceiving window, that is, the periodically reserved resources of the second terminal device. In the following, in NR V2X communication, how the first terminal device perceives the periodically reserved resources of the second terminal device will be described in detail.

When the first terminal device needs to perform periodic resource reservation awareness, it indicates that the target resource pool is configured as a resource pool that can be periodically reserved. At this time, for the y-th time slot t _y among the above Y time slots, the first terminal device also determines a group of sensing time slots corresponding to the _{time slot t y}

Wherein, μ is related to the subcarrier interval, and the _m is configured by the network according to the carrier type and the service period of the periodic service supported by the auxiliary link resource pool. After that, the first terminal device uses each sensing time slot

And predict the time-frequency resources occupied by the second terminal device in the Y time slots. Finally, when the first terminal device selects time-frequency resources for auxiliary link communication, in addition to eliminating the time-frequency resources aperiodicly occupied by the second terminal device from the Y time slots, it also needs to select Y time-frequency resources. The time-frequency resource periodically occupied by the second terminal device is excluded from the time slot.

Please refer to Figure 5 again, the time slot sequence numbers of the physical time slots of the three time slots selected by the first terminal device are marked as t _y1 , t _y2 , and t _y3 , then a set of sensing time slots corresponding to the three time slots for

As shown in the figure, the solid arrow, the dashed arrow and the dotted arrow are shown. When y = y1, the resulting perceived timeslot t _y1 corresponding slot, as shown by the solid line arrows; if y = y2 obtained when the corresponding time slot t _y2 perception slot, the broken line arrows in FIG. ; when y = y3, the resulting perceived timeslot t _y3 corresponding slot, as shown in dotted line arrows in FIG. Among them, _{the value of m} depends on the carrier type and the service period of the periodic service supported by the secondary link resource pool.

In the following, _{the value of m} in the foregoing embodiment will be described in detail.

When the carrier type indicates that the secondary link carrier is an intelligent traffic system (Intelligent Traffic System, ITS) dedicated carrier or a frequency-division duplex (Frequency-division Duplex, FDD) shared carrier, the resources in the secondary link resource pool include Uplink resources, but no resources for downlink. The first terminal device does not need to exclude resources for downlink from the secondary link resource pool. Therefore, _{the value set of m is} the same as the periodic service business supported by the secondary link resource pool. The period is the same, depending on the configuration or pre-configuration of the network, the configuration range is {0,[1:99],100,200,300,400,500,600,700,800,900,1000}.

When the carrier type indicates that the secondary link carrier is a frequency division duplex (Time-division Duplex, TDD) shared carrier, the resources in the secondary link resource pool include resources for downlink and resources for uplink. A terminal device needs to exclude resources used for downlink from the secondary link resource pool. For example, the service period of a periodic service is 100 ms, and data cannot be sent on downlink resources. Therefore, _{the value set of m} is associated with the service period of the periodic service supported by the auxiliary link resource pool, and the value set of _{m can be uniquely obtained from the reserved period set.} Among them, the association relationship can be configured or pre-configured by the network device.

In addition, the above-mentioned embodiment shown in FIG. 5 is an example in which the network-side device configuration or pre-configuration target resource pool can perform periodic resource reservation and the subcarrier interval is 15 kHz to describe the embodiment of the present application in detail. However, the embodiments of the present application are not limited thereto. In the following, the network-side device configuration or pre-configuration of the target resource pool cannot perform periodic resource reservation and the subcarrier interval is 30 kHz as an example to describe the embodiments of the present application in detail. For example, please refer to Figure 6.

Fig. 6 is a schematic diagram of another method for selecting resources for auxiliary link communication provided by an embodiment of the present application. In this embodiment, the sub-carrier interval is 30 kHz, that is, the length of a time slot is 0.5 ms. It can be seen from the above Table 1 that μ=1, and when X=100, the time slot offset is X×2 ^μ =200. The first terminal device triggers resource selection or reselection at time n, and the physical time slot in which time slot n is located is marked as t _n . Since the network configuration or the configuration target resource pool cannot be periodically reserved, the first terminal device only needs to perceive non-periodically reserved resources.

Referring to FIG. 6, when the physical time slot offset is adopted, the start time domain position of the _{resource selection window is t n} +1, and the end time domain position of the resource selection window is t _n +L. The first terminal device selects Y physical time slots in the resource selection window, for example, Y=3, and the three physical time slots are respectively marked as t _n +3, t _n +4, and t _n +L-1. The first terminal device will select appropriate resources in the three time slots for auxiliary link communication according to the reservation information of the aperiodic resources of the second terminal device in the resource perception window. During the sensing process, when the first terminal device determines the starting time domain position of the resource sensing window, it selects the time slot with the smallest time slot sequence number _{among t n} +3, t _n +4, and t _{n +L-1, and the smallest} Subtract a slot offset X×2 ^{μ from the} sequence number of the slot. Since X×2 ^μ =200 and t _n +3 is the time slot with the smallest time slot sequence number, the starting time domain position of the resource sensing window is t _n -197. The end time domain position of the resource awareness window is nt _proc,0 .

In addition, when the logical slot offset identifier is used, the start time domain position of the _{resource selection window is t n+1} , and the end time domain position of the resource selection window is t _n+L′ . The first terminal device selects Y logical time slots in the resource selection window, such as 3 logical time slots, and the physical time slot sequence numbers corresponding to the 3 logical time slots are t _n+2 , t _n+3 , t _{n +L′-1} . The first terminal device will select appropriate resources in the three time slots for auxiliary link communication according to the reservation information of the aperiodic resources of the second terminal device in the resource perception window. During the sensing process, when the first terminal device determines the starting time domain position of the resource sensing window, it selects the physical time slot with the smallest time slot sequence number _{among t n+2} , t _n+3 , and t _{n+L′-1, and immediately} Slot t _n+2 , when X'=32, the starting time domain position of the resource sensing window is the starting position _{of the time slot where t n+2-32} is located, that is, the starting time domain position of the resource sensing window is t The starting position of the time slot where _{n-30 is located.}

The following are device embodiments of this application, which can be used to implement the method embodiments of this application. For details that are not disclosed in the device embodiments of this application, please refer to the method embodiments of this application.

FIG. 7 is a schematic structural diagram of a communication device provided by an embodiment of this application. The communication device 100 may be a chip or a chip module, and each module in the communication device 100 may be software and/or hardware. As shown in FIG. 7, the communication device 100 includes:

The first determining module 11 is configured to determine a time slot offset, where the time slot offset is used to indicate the offset of the starting time domain position of the resource sensing window with respect to the position of the time slot with the smallest time slot sequence number. The time slot with the smallest time slot sequence number is included in Y time slots, the Y time slots are selected by the first terminal device from the resource selection window, and the Y is greater than or equal to a preset threshold;

The second determining module 12 is configured to determine a resource sensing window, and the time domain start position of the resource sensing window is determined by the first terminal device using the time slot with the smallest time slot sequence number and the time slot offset ；

The prediction module 13 is configured to use the sensing result of each resource in the resource sensing window to predict the time-frequency resources non-periodically occupied by the second terminal device in the Y time slots;

The selection module 14 is configured to select time-frequency resources used for auxiliary link communication from the time-frequency resources that are not occupied by the second terminal device in the Y time slots.

In a feasible design, the time slot offset is a physical time slot offset, and the physical time slot offset is X×2 ^μ , wherein the X is configured or pre-configured by the network side device, and the μ Related to the subcarrier spacing; the starting time domain position of the resource sensing window is the starting position of the time slot min( _ty )-X×2 ^μ , where the min( _ty ) represents the Y time The smallest physical time slot sequence number in the slot; the end time domain position of the resource perception window is nt _proc,0 , the n is the time when the first terminal device triggers resource selection, and the t _proc,0 represents all The duration of the perception processing of the first terminal device.

In a feasible design, the time slot offset is a logical time slot offset, the logical time slot offset is X', and the X'represents multiple transmissions reserved for a transmission block TB by NR V2X communication The maximum logical time slot interval between

The starting time domain position of the resource sensing window is the starting position of the physical time slot t _ymin-X' , where the ymin represents the smallest logical time slot sequence number among the Y time slots, and the smallest logical time The physical time slot sequence number corresponding to the slot sequence number is marked as t _ymin , and the ymin-X′ represents the logical time slot sequence number offset by X′ from ymin.

FIG. 8 is a schematic structural diagram of another communication device provided by an embodiment of the present application. The communication device 100 provided in this embodiment may be a chip or a chip module, and each module in the communication device 100 may be software and/or hardware. Based on the above-mentioned communication device 100 shown in FIG. 7, the communication device 100 provided in this embodiment further includes:

The third determining module 15 is configured to determine whether time n is included in the secondary link resource pool, the time slot in the secondary link resource pool is the time slot used for secondary link communication, and the n is the first When the terminal device triggers resource selection, if t _{n is} included in the secondary link resource pool, the first terminal device determines that the end time domain position of the resource sensing window is the time slot t _n-1 , and t _n is the sequence number of the physical time slot at the time n. If the time slot t _{n is} not included in the secondary link resource pool, the end time domain position of the resource sensing window is determined to be the time slot t _{m- 1. The} time slot t _m is the time slot closest to _{the time slot t n} and located after the time _{slot t n} in the secondary link resource pool.

Please refer to FIG. 8 again. In a feasible design, the above-mentioned communication device 100 further includes:

The fourth determining module 16 is used to determine the sensing time slot corresponding to the _{time slot t y}

The time slot t _y is any one of the Y time slots, the μ is related to the subcarrier interval, and the _m is a periodic service service supported by the network according to the carrier type and the auxiliary link resource pool Periodically configured

The prediction module 13 is also used to use each sensing time slot

And predict the time-frequency resources occupied by the second terminal device in the Y time slots.

In a feasible design, when the carrier type indicates that the secondary link carrier is an intelligent transportation system ITS dedicated carrier or a frequency division duplex FDD shared carrier, the _{value set of m} and the secondary link resource pool support The business cycle of periodic business is the same.

In a feasible design, when the carrier type indicates that the secondary link carrier is a shared carrier of frequency division duplex TDD, the _{value set of m} is related to the service period of the periodic service supported by the secondary link resource pool United.

The communication device provided in the embodiment of the present application can perform the actions of the first terminal device in the foregoing embodiment, and its implementation principles and technical effects are similar, and details are not described herein again.

FIG. 9 is a schematic structural diagram of an electronic device provided by an embodiment of the application. As shown in FIG. 9, the electronic device 200 includes:

Processor 21 and memory 22;

The memory 22 stores computer execution instructions;

The processor 21 executes the computer-executable instructions stored in the memory 22, so that the processor 21 executes the resource selection method of the auxiliary link communication executed by the first terminal device above.

For the specific implementation process of the processor 21, refer to the foregoing method embodiments, and the implementation principles and technical effects are similar, and will not be repeated here in this embodiment.

Optionally, the electronic device 200 further includes a communication component 23. Among them, the processor 21, the memory 22, and the communication component 23 may be connected through a bus 24.

An embodiment of the present application also provides a readable storage medium, the readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, they are used to implement the auxiliary link communication performed by the first terminal device as above. Resource selection method.

The embodiment of the present application also provides a computer program product, which is used to implement a resource selection method for auxiliary link communication executed by the first terminal device when the computer program product runs on the first terminal device.

A person of ordinary skill in the art can understand that all or part of the steps in the foregoing method embodiments can be implemented by a program instructing relevant hardware. The aforementioned program can be stored in a computer readable storage medium. When the program is executed, it executes the steps including the foregoing method embodiments; and the foregoing storage medium includes: ROM, RAM, magnetic disk, or optical disk and other media that can store program codes.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the application, not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or equivalently replace some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present application. scope.

Claims (16)

1. A resource selection method for auxiliary link communication is characterized in that it includes:

   The first terminal device determines a time slot offset, where the time slot offset is used to indicate the offset of the starting time domain position of the resource sensing window relative to the position of the time slot with the smallest time slot sequence number, where the time slot sequence number is the smallest The time slots of is included in Y time slots, the Y time slots are selected by the first terminal device from the resource selection window, and the Y is greater than or equal to a preset threshold;

   Determining, by the first terminal device, a resource perception window, and the time domain start position of the resource perception window is determined by the first terminal device using the time slot with the smallest time slot sequence number and the time slot offset;

   The first terminal device uses the sensing result of each resource in the resource sensing window to predict the time-frequency resources in the Y time slots that are non-periodically occupied by the second terminal device;

   The first terminal device selects time-frequency resources used for secondary link communication from the time-frequency resources in the Y time slots that are not occupied by the second terminal device.
2. The method of claim 1, wherein:

   The time slot offset is a physical time slot offset, and the physical time slot offset is X×2 ^μ , wherein the X is configured or pre-configured by the network side device, and the μ is related to the subcarrier interval;

   The starting time domain position of the resource sensing window is the starting position of the physical time slot min( _ty )-X×2 ^μ , where the min( _ty ) represents the smallest physical time slot in the Y time slots. Time slot sequence number;

   The end time domain position of the resource perception window is nt _proc,0 , the n is the moment when the first terminal device triggers resource selection, and the t _proc,0 represents the perception processing duration of the first terminal device .
3. The method of claim 1, wherein:

   The time slot offset is a logical time slot offset, and the logical time slot offset is X', and the X'represents the interval between multiple transmissions reserved for a transmission block TB for the new wireless car and everything NR V2X communication Maximum logical time slot interval;

   The starting time domain position of the resource sensing window is the starting position of the physical time slot t _{y min-X'} , where the y min represents the smallest logical time slot sequence number among the Y time slots, and the smallest logical time slot The physical time slot sequence number corresponding to the time slot sequence number is marked as t _{y min} , and the y min-X′ represents the logical time slot sequence number offset by X′ from y min.
4. The method according to claim 3, further comprising:

   The first terminal device determines whether time n is included in the secondary link resource pool, the time slot in the secondary link resource pool is a time slot used for secondary link communication, and the n is the first terminal device At the time when resource selection is triggered, if t _{n is} included in the secondary link resource pool, the first terminal device determines that the end time domain position of the resource sensing window is time slot t _n-1 , and t _n Is the sequence number of the physical time slot at the time n;

   If the time slot t _{n is} not included in the secondary link resource pool, the first terminal device determines that the end time domain position of the resource sensing window is the time slot t _m-1 , and the time slot t _m It is the time slot closest to _{the time slot t n} and located after the time _{slot t n} in the secondary link resource pool.
5. The method according to any one of claims 1 to 4, further comprising:

   The first terminal device determines the sensing time slot corresponding to the _{time slot t y}

   

   The time slot t _y is any one of the Y time slots, the μ is related to the subcarrier interval, and the _m is a periodic service service supported by the network according to the carrier type and the auxiliary link resource pool Periodically configured

   The first terminal device uses each sensing time slot

   

   And predict the time-frequency resources occupied by the second terminal device in the Y time slots.
6. The method of claim 5, wherein:

   When the carrier type indicates that the secondary link carrier is an intelligent transportation system ITS dedicated carrier or a frequency division duplex FDD shared carrier, the value set of m is the same as the service period of the periodic service supported by the secondary link resource pool .
7. The method of claim 5, wherein:

   When the carrier type indicates that the secondary link carrier is a shared carrier of frequency division duplex TDD, the value set of m is associated with the service period of the periodic service supported by the secondary link resource pool.
8. A communication device, characterized in that it comprises:

   The first determining module is configured to determine a time slot offset, where the time slot offset is used to indicate the offset of the starting time domain position of the resource sensing window with respect to the position of the time slot with the smallest time slot sequence number, and the time The time slot with the smallest slot number is included in Y time slots, the Y time slots are selected by the first terminal device from the resource selection window, and the Y is greater than or equal to a preset threshold;

   A second determining module, configured to determine a resource sensing window, the time domain starting position of the resource sensing window is determined by the first terminal device using the time slot with the smallest time slot sequence number and the time slot offset;

   A prediction module, configured to use the sensing result of each resource in the resource sensing window to predict the time-frequency resources non-periodically occupied by the second terminal device in the Y time slots;

   The selection module is configured to select time-frequency resources used for auxiliary link communication from the time-frequency resources not occupied by the second terminal device in the Y time slots.
9. The device according to claim 8, wherein:

   The time slot offset is a physical time slot offset, and the physical time slot offset is X×2 ^μ , wherein the X is configured or pre-configured by the network side device, and the μ is related to the subcarrier interval;

   The starting time domain position of the resource sensing window is the starting position of the time slot min( _ty )-X×2 ^μ , where the min( _ty ) represents the smallest physical time in the Y time slots Slot number

   The end time domain position of the resource perception window is nt _proc,0 , the n is the moment when the first terminal device triggers resource selection, and the t _proc,0 represents the perception processing duration of the first terminal device .
10. The device according to claim 8, wherein the time slot offset is a logical time slot offset, and the logical time slot offset is X', and the X'indicates that the NR V2X communication pair is a transmission block TB The reserved maximum logical time slot interval between multiple transmissions;

    The starting time domain position of the resource sensing window is the starting position of the physical time slot t _{y min-X'} , where the y min represents the smallest logical time slot sequence number among the Y time slots, and the smallest logical time slot The physical time slot sequence number corresponding to the time slot sequence number is marked as t _{y min} , and the y min-X′ represents the logical time slot sequence number offset by X′ from y min.
11. The device according to claim 10, further comprising:

    The third determining module is configured to determine whether time n is included in the secondary link resource pool, the time slot in the secondary link resource pool is the time slot used for secondary link communication, and the n is triggered by the first terminal device At the time of resource selection, if t _{n is} included in the secondary link resource pool, the first terminal device determines that the end time domain position of the resource sensing window is the time slot t _n-1 , and the t _n is The sequence number of the physical time slot at the time n, if the time slot t _{n is} not included in the secondary link resource pool, the end time domain position of the resource sensing window is determined to be the time slot t _m-1 , so The time slot t _m is the time slot closest to _{the time slot t n} and located after the time _{slot t n} in the secondary link resource pool.
12. The device according to any one of claims 8 to 11, further comprising:

    The fourth determining module is used to determine the sensing time slot corresponding to the _{time slot t y}

    

    The time slot t _y is any one of the Y time slots, the μ is related to the subcarrier interval, and the m is a periodic service service supported by the network according to the carrier type and the auxiliary link resource pool Periodically configured

    The prediction module is also used to use each sensing time slot

    

    And predict the time-frequency resources occupied by the second terminal device in the Y time slots.
13. The apparatus according to claim 12, wherein when the carrier type indicates that the secondary link carrier is an intelligent transportation system ITS dedicated carrier or a frequency division duplex FDD shared carrier, the value set of m and the secondary link carrier The periodic services supported by the link resource pool have the same business cycle.
14. The apparatus according to claim 12, wherein when the carrier type indicates that the secondary link carrier is a shared carrier of frequency division duplex TDD, the value set of m and the period supported by the secondary link resource pool The business cycle of the sex business.
15. An electronic device, characterized in that it comprises a processor, a memory, and a computer program stored on the memory and running on the processor, wherein the processor causes the electronic device to execute the program The method according to any one of the above claims 1-7 is realized.
16. A readable storage medium, characterized in that instructions are stored in the readable storage medium, which when run on an electronic device, cause the electronic device to execute the method according to any one of claims 1-7.

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