Resource selection method, system, device and storage medium for auxiliary link communication

Abstract

The application discloses a kind of resource selection methods, systems, equipment and storage medium of secondary link communication, which comprises: selecting X first candidate resource time in the resource selection window of resource selection trigger time in advance;Z second candidate resource time is selected in the resource selection window of each first candidate resource time in advance;The m second candidate resource time contained in the resource selection window corresponding to resource reselection trigger time is used as the candidate resource selection time of the time;According to the resource sensing result of each candidate resource selection time, the time-frequency resource used for secondary link communication is finally selected out.This application enhances the candidate resource selection time mechanism in partial sensing mechanism, realizes the same size of candidate resource time set in each resource reselection time triggered by resource reevaluation and strong occupation, ensures that there are enough candidate resources when resource reselection is carried out at any resource reselection time, effectively improves the success rate of secondary link data transmission.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a resource selection method, system, device and storage medium for auxiliary link communication. Background Art

[0002] Vehicle-to-everything (V2X) communication is a key technical direction of Release 16 (R16) of the protocol. NR (New Radio) V2X, as an enhancement of Long Term Evolution (LTE) V2X, is a key technology enabling the Internet of Vehicles.

[0003] In V2X communication, V2X devices communicate with each other via a sidelink. There are two resource allocation methods for V2X communication. The first is scheduled resource allocation, in which the base station configures resources for sidelink communication for V2X devices. This method is primarily used in Mode 3 of LTE V2X communication and Mode 1 of NR V2X communication. The second is perception-based resource selection, which does not require the base station to schedule resources. This method is primarily used in Mode 4 of LTE V2X communication and Mode 2 of NR V2X communication. In the perception-based resource selection method, a V2X device receives the Physical Sidelink Control Channel (PSCCH) sent by other V2X devices within a resource perception window, determines the reserved resources of other V2X devices based on the PSCCH, then excludes the reserved resources from the resource selection window and selects resources for sidelink communication from the remaining available resources.

[0004] To reduce power consumption in auxiliary link terminals and achieve energy conservation, LTE V2X proposes a partial sensing mechanism, which reduces the sensing time to achieve terminal energy conservation. To improve the reliability of resource selection based on partial sensing, NR V2X can introduce a resource reselection mechanism triggered by resource re-evaluation and resource pre-emption. However, due to the inherent characteristics of the partial sensing mechanism, which predetermines candidate resource selection and the corresponding sensing time, resource re-evaluation and resource pre-emption can result in too few or even no candidate resources available for reselection after resource reselection is triggered, resulting in resource reselection failure and the inability of V2X devices to successfully transmit data. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defect in the prior art that when a resource reselection mechanism triggered by resource re-evaluation and resource seizure is introduced into a partial perception mechanism, there is too few or even no candidate resources for resource reselection, thereby causing resource reselection failure. The purpose is to provide a resource selection method, system, device and storage medium for auxiliary link communication.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] The present invention provides a resource selection method for auxiliary link communication, which is applied in a V2X device and includes:

[0008] Pre-selecting X first candidate resource moments within a resource selection window corresponding to a resource selection trigger moment; wherein X is greater than or equal to a first set threshold;

[0009] Pre-selecting Z second candidate resource moments within a resource selection window corresponding to each of the first candidate resource moments; wherein Z is greater than or equal to a second set threshold;

[0010] Obtaining a resource reselection triggering moment between the resource selection triggering moment and a data packet delay budget PDB;

[0011] Using m second candidate resource moments contained in the resource selection window corresponding to the resource reselection trigger moment as candidate resource selection moments for the resource reselection trigger moment; wherein m is greater than or equal to a third set threshold and less than or equal to Z;

[0012] According to the resource perception result determined at each candidate resource selection moment, an unoccupied first time-frequency resource is selected from the m candidate resource selection moments, and a target time-frequency resource for auxiliary link communication is selected from the first time-frequency resources.

[0013] In the partial perception (local perception) mode, when the V2X device triggers resource selection at time n, X candidate resource times are selected in advance within the resource selection window [n+T1, n+T2].

[0014] In order to avoid the situation where there are few or even no candidate resources when reselecting resources at any of the X candidate resource moments, resulting in resource reselection failure, Z candidate resource moments are pre-selected within the resource selection window [x+T1, x+T2] corresponding to each of the X candidate resource moments (e.g., marked as x). This ensures that there are sufficient candidate resources when reselecting resources at any of the X candidate resource moments. In other words, the mechanism for determining the candidate resource selection moment in the partial perception mechanism is enhanced, reducing the incidence of V2X devices failing to successfully transmit data due to resource collisions, thereby effectively improving the reliability of resource selection and, in turn, the success rate of auxiliary link data transmission.

[0015] Preferably, both X and Z are configured or pre-configured by the network side device.

[0016] Specifically, the values ​​of X, Z, and m can be reconfigured or adjusted to meet auxiliary link communication scenarios with different communication requirements, thereby further improving the versatility and reliability of resource selection.

[0017] Preferably, the resource reselection triggering moment is a moment triggered by a resource reselection mechanism of resource re-evaluation or resource seizure between the resource selection triggering moment and the remaining packet delay budget (PDB).

[0018] When a resource reselection mechanism triggered by resource re-evaluation and resource forcible seizure is introduced into a partial perception mechanism, resource reselection is performed based on the above-mentioned resource selection method for the resource reselection moment triggered by resource re-evaluation or resource forcible seizure that occurs after the resource selection trigger moment n and before the data packet delay budget PDB, so as to solve the problem that there are few or no candidate resources in the existing resource reselection mechanism triggered by resource re-evaluation and resource forcible seizure introduced into the partial perception mechanism.

[0019] Preferably, the step of selecting an unoccupied first time-frequency resource from the m candidate resource selection moments according to the resource sensing result determined at each candidate resource selection moment, and selecting a target time-frequency resource for auxiliary link communication from the first time-frequency resource includes:

[0020] Obtain resource perception results determined by the m candidate resource selection moments within the resource perception window corresponding to the resource selection trigger moment; wherein the resource perception result is used to characterize the resource perception situation of each candidate resource selection moment.

[0021] Based on the resource sensing result, an occupied candidate resource selection time among the m candidate resource selection time moments is determined to select an unoccupied first time-frequency resource, and a target time-frequency resource for auxiliary link communication is selected from the first time-frequency resources.

[0022] Based on the resource perception window corresponding to each resource selection trigger moment n, the resource perception results determined at the m candidate resource selection moments are obtained to obtain the time-frequency resources occupied (reserved) by other V2X devices at these candidate resource selection moments. These time-frequency resources are then excluded to obtain the available time-frequency resources not occupied by other V2X devices. Finally, the target time-frequency resources for auxiliary link communication are selected from these available time-frequency resources, thereby effectively avoiding resource collisions with other V2X devices and improving the data communication quality of the auxiliary link communication.

[0023] Preferably, m=Z.

[0024] For each possible resource reselection moment triggered by re-evaltion and preemption, the corresponding candidate resource moment set has the same size. This further ensures that there are sufficient candidate resources when resource reselection is performed at any of the X candidate resource moments. This avoids the situation where the existing candidate resource moments face different candidate resource moment sets, and the candidate resource moment sets gradually decrease or even have no candidate resources to choose from.

[0025] The present invention also provides a resource selection system for auxiliary link communication, the resource selection system being applied in a V2X device, and the resource selection system comprising:

[0026] A first pre-selection module is configured to pre-select X first candidate resource moments within a resource selection window corresponding to a resource selection trigger moment; wherein X is greater than or equal to a first set threshold;

[0027] A second pre-selection module is configured to pre-select Z second candidate resource moments within a resource selection window corresponding to each of the first candidate resource moments; wherein Z is greater than or equal to a second set threshold;

[0028] A reselection triggering time acquisition module, configured to acquire a resource reselection triggering time between the resource selection triggering time and the data packet delay budget PDB;

[0029] a candidate resource selection moment determination module, configured to use m second candidate resource moments contained in a resource selection window corresponding to the resource reselection trigger moment as candidate resource selection moments for the resource reselection trigger moment; wherein m is greater than or equal to a third set threshold and less than or equal to Z;

[0030] A time-frequency resource selection module is used to select an unoccupied first time-frequency resource from m candidate resource selection moments according to the resource perception result determined at each candidate resource selection moment, and select a target time-frequency resource for auxiliary link communication from the first time-frequency resource.

[0031] Preferably, both X and Z are configured or pre-configured by the network side device.

[0032] Preferably, the resource reselection triggering moment is a moment between the resource selection triggering moment and the packet delay budget PDB, triggered by a resource reselection mechanism of resource re-evaluation or resource seizure.

[0033] Preferably, the time-frequency resource selection module includes:

[0034] A perception result acquisition unit, configured to acquire resource perception results determined at the m candidate resource selection moments within a resource perception window corresponding to the resource selection trigger moment;

[0035] A time-frequency resource selection unit is used to determine the occupied candidate resource selection time among the m candidate resource selection time moments based on the resource perception result to select the unoccupied first time-frequency resource, and select the target time-frequency resource for auxiliary link communication from the first time-frequency resource.

[0036] Preferably, m=Z.

[0037] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned resource selection method for auxiliary link communication when executing the computer program.

[0038] The present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the resource selection method for auxiliary link communication.

[0039] On the basis of conforming to the common sense in this field, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present invention.

[0040] The positive progress effect of the present invention is:

[0041] In the present invention, for resource selection performed at time n, X candidate resource moments are pre-selected within the resource selection window [n+T1, n+T2], and for each of the X candidate resource moments, Z candidate resource moments are pre-selected within the resource selection window [x+T1, x+T2]. For resource reselection triggered by re-evaluation and pre-emption that occurs after time n and before PDB, the m candidate resources contained in the resource selection window corresponding to the resource reselection triggering moment are used as the candidate resource moments for the new triggering moment. That is, the present invention enhances the mechanism for determining candidate resource selection moments in the partial sensing mechanism. For each possible resource reselection moment triggered by re-evaluation and pre-emption, sufficient candidate resources are guaranteed when resource reselection is performed at any of the X candidate resource moments. This reduces the incidence of V2X devices failing to successfully transmit data due to resource collisions, thereby improving the reliability of resource selection and effectively increasing the success rate of auxiliary link data transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 Schematic diagram of the global perception method in existing LTE V2X communication.

[0043] Figure 2 Schematic diagram of some sensing methods in existing LTE V2X communication.

[0044] Figure 3 Schematic diagram of resource selection for the existing resource reselection mechanism based on resource reassessment.

[0045] Figure 4 A schematic diagram of resource selection for an existing resource reselection mechanism based on resource seizure.

[0046] Figure 5 Schematic diagram of resource selection that combines the existing partial perception with the resource reselection mechanism of resource reassessment.

[0047] Figure 6 This is a flowchart of a resource selection method for auxiliary link communication according to embodiment 1 of the present invention.

[0048] Figure 7 This is a schematic diagram of resource selection that combines partial perception with a resource reselection mechanism of resource re-evaluation according to embodiment 1 of the present invention.

[0049] Figure 8 This is a schematic diagram of resource selection under the non-periodic reserved partial sensing moment determination mechanism of embodiment 1 of the present invention.

[0050] Figure 9 This is a structural diagram of a resource selection system for auxiliary link communication according to embodiment 2 of the present invention.

[0051] Figure 10 This is a structural diagram of an electronic device for implementing a resource selection method for auxiliary link communication according to embodiment 3 of the present invention. DETAILED DESCRIPTION

[0052] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0053] In V2X communication, resource allocation methods are categorized into scheduled resource allocation and perception-based resource selection, depending on whether network devices require scheduling via high-layer signaling. Based on the range of perception, perception-based resource selection methods are further categorized into full sensing and partial sensing, which can also be referred to as partial sensing. The following uses LTE V2X communication as an example to explain global and partial sensing methods in detail.

[0054] Regarding the global sensing method in LTE V2X communications: Based on the sensing results of the resource sensing window, a V2X device excludes resources within the resource selection window that may be occupied by other V2X devices, selects time-frequency resources for auxiliary link communications from the remaining available resources, and periodically reserves these resources. When the V2X device needs to use auxiliary link resources again, it directly transmits data on the reserved resources without having to reselect resources. During this process, the V2X device needs to sense every resource within the entire resource sensing window to predict the resources within the resource selection window that may be occupied by other V2X devices based on the sensing results.

[0055] like Figure 1 As shown, Figure 1 Figure 1 illustrates the global sensing method used in LTE V2X communication. V2X device 4 triggers resource selection at time n. Assuming the resource sensing window is [n-1000, n] and the resource selection window is [n+T1, n+T2], V2X device 4 senses all resources within the resource sensing window. Based on the sensing results, it predicts the resources within the resource selection window that may be occupied by V2X devices 1 through 3. When subsequently conducting auxiliary link communication, it selects time-frequency resources for auxiliary link communication from the remaining resources and periodically reserves them.

[0056] Regarding the local perception method in LTE V2X communication: Compared with the global perception method, the local perception method does not need to perceive all resources within the entire resource perception window, but rather perceives some discrete resources.

[0057] like Figure 2 As shown, Figure 2This is a schematic diagram of the local perception (partial perception) method in LTE V2X communication. That is, assuming that the time when the user triggers resource selection is n, it pre-selects no less than Y subframes (i.e., candidate resource moments) within the resource selection time window [n+T1, n+T2]. The selection method depends on the user implementation, but the value of Y is not less than the threshold configured or pre-configured by the network. For the yth subframe among the Y subframes, the corresponding auxiliary link perception subframe is selected as yk×Pstep, where the value of k ranges from 1 to 10. The actual value depends on the configuration or pre-configuration of the network. Pstep is configured or pre-configured by the network. Figure 1 As shown in the figure, the user selects three subframes within the resource selection window, labeled y1, y2, and y3. Therefore, for subframe y1, the user only judges and selects the resources in subframe y1 based on the perception results of subframe y1-k×Pstep. The same is true for subframes y2 and y3, greatly reducing the number of subframes that the user needs to perceive.

[0058] NR V2X also aims to achieve energy conservation, with the design of energy-saving mechanisms being a key component of its Release 17 standardization. This design will leverage some of LTE V2X's sensing mechanisms, with necessary enhancements tailored to NR V2X's characteristics. Furthermore, during the Release 16 standardization process, NR V2X introduced a resource reselection mechanism triggered by resource re-evaluation and pre-emption to enhance the reliability of its perception-based resource selection method, Mode 2.

[0059] Among them, the principle of resource reselection mechanism based on resource re-evaluation is as follows: Figure 3 As shown, assuming that the time when the user selects or reselects resources is n, then according to the perception result of resource perception window 1, the user pre-selects the auxiliary link resource that meets the requirements in resource selection window 1, such as Figure 3 The resources located in time slot m and time slot k can be used to transmit the same TB twice, with the initial transmission using the resources in time slot m and the retransmission using the resources in time slot k. When the user sends the initial transmission at time slot m, the retransmission resources in time slot k can be reserved. According to the resource re-evaluation mechanism, before the auxiliary link transmission starts at time slot m, the user can continue to judge based on the perception results from time n to the current time whether the pre-selected resources in time slot m and time slot k have been reserved or occupied by other users. If so, resource reselection can be triggered at the latest at time m-T3. Based on the perception results of resource perception window 2, a new set of transmission resources is selected within resource selection window 2, such as Figure 2 The resources shown in the time slots m', k' are selected, thereby reducing resource collisions and improving the reliability of resource selection.

[0060] The principle of resource reselection mechanism based on seizure is as follows: Figure 4 As shown, assuming that the time when the user selects or reselects resources is n, then according to the perception result of resource perception window 1, the user pre-selects the auxiliary link resource that meets the requirements in resource selection window 1, such as Figure 4 The resources located in time slot m and time slot k can be used to transmit the same TB twice. The initial transmission uses the resources in time slot m, and the retransmission uses the resources in time slot k. When the user sends the initial transmission at time slot m, the retransmission resources in time slot k can be reserved. According to the resource reselection mechanism based on preemption triggering, although the retransmission resources in time slot k have been reserved by the user in time slot m, they may still be occupied by users sending other high-priority services, resulting in preemption. At this time, for low-priority users, in order to reduce transmission collisions, resources can be reselected. The user can trigger resource reselection at the latest at time k-T3, and select a new transmission resource within resource selection window 2 based on the perception results of resource perception window 2, such as Figure 3 The resources shown in time slot k' are selected, thereby reducing resource collisions and improving the reliability of resource selection.

[0061] At present, in order to improve the reliability of NRV2X resource selection based on partial perception, a resource reselection mechanism based on resource re-evaluation and forced seizure triggering should be introduced. However, since the partial perception mechanism itself predetermines the characteristics of candidate resource selection and corresponding perception time, it will result in too few or no candidate resources for resource reselection after resource re-evaluation and forced seizure triggering resource reselection (e.g. Figure 5 As shown in the resource re-evaluation, the resource re-selection fails due to insufficient candidate resources.

[0062] Figure 3-Figure 5 English explanation: Sensing window1: resource sensing window 1, Sensing window2: resource sensing window 2, selection window1: resource selection window, selection window2: resource selection window; Resource (re-)selection triggered: resource selection (reselection) triggered moment, Resource (re-)evaluation triggered: resource reselection triggered moment under resource re-evaluation, slot m: time slot m), slot k: time slot k; slot m': time slot m', slot k': time slot k', Remaining PDB: packet delay budget PDB.

[0063] In view of this, this embodiment provides a resource selection method for auxiliary link communication. For each possible resource reselection moment triggered by re-evaluation and pre-emption, the set of candidate resource moments is the same size, ensuring that there are sufficient candidate resources when resource reselection is performed at any of the X candidate resource moments, effectively improving the success rate of auxiliary link data transmission.

[0064] The resource selection method for auxiliary link communication of the present invention is described in detail below through the following embodiments.

[0065] Example 1

[0066] like Figure 6 As shown, the resource selection method for auxiliary link communication in this embodiment includes:

[0067] S101. Pre-select X first candidate resource moments within a resource selection window corresponding to a resource selection trigger moment; where X is greater than or equal to a first set threshold;

[0068] In the partial perception (local perception) mode, when the V2X device triggers resource selection at time n, X candidate resource times are selected in advance within the resource selection window [n+T1, n+T2].

[0069] S102. Pre-select Z second candidate resource moments within a resource selection window corresponding to each first candidate resource moment; wherein Z is greater than or equal to a second set threshold;

[0070] X and Z are both configured or pre-configured by the network-side device.

[0071] Specifically, the values ​​of X, Z, and m can be reconfigured or adjusted to meet auxiliary link communication scenarios with different communication requirements, thereby further improving the versatility and reliability of resource selection.

[0072] In order to avoid the situation where there are few or even no candidate resources when reselecting resources at any of the X candidate resource moments, resulting in resource reselection failure, Z candidate resource moments are pre-selected within the resource selection window [x+T1, x+T2] corresponding to each of the X candidate resource moments (e.g., marked as x). This ensures that there are sufficient candidate resources when reselecting resources at any of the X candidate resource moments. In other words, the mechanism for determining the candidate resource selection moment in the partial perception mechanism is enhanced, reducing the incidence of V2X devices failing to successfully transmit data due to resource collisions, thereby effectively improving the reliability of resource selection and, in turn, the success rate of auxiliary link data transmission.

[0073] S103, obtaining a resource reselection triggering time between the resource selection triggering time and the data packet delay budget PDB;

[0074] The resource reselection triggering moment is a moment between the resource selection triggering moment and the packet delay budget PDB, triggered by a resource reselection mechanism such as resource re-evaluation or resource seizure.

[0075] When a resource reselection mechanism triggered by resource re-evaluation and resource forcible seizure is introduced into a partial perception (i.e., local perception) mechanism, resource reselection is performed based on the above-mentioned resource selection method for the resource reselection moment triggered by resource re-evaluation or resource forcible seizure that occurs after the resource selection trigger moment n and before the data packet delay budget PDB, so as to solve the problem that there are few or no candidate resources in the existing resource reselection mechanism triggered by resource re-evaluation and resource forcible seizure introduced into the partial perception mechanism.

[0076] S104: Use m second candidate resource moments contained in the resource selection window corresponding to the resource reselection trigger moment as candidate resource selection moments for the resource reselection trigger moment; where m is greater than or equal to a third set threshold and less than or equal to Z;

[0077] The m candidate resource selection moments of the resource reselection triggering moment are selected so that each resource reselection triggering moment has sufficient candidate resources, which greatly improves the success rate of auxiliary link data transmission.

[0078] In addition, for each possible resource reselection moment triggered by re-evaluation and preemption, the corresponding candidate resource moment set has the same size (m=Z), further ensuring that there are enough candidate resources when resource reselection is performed at any of the X candidate resource moments, avoiding the situation where the existing candidate resource moments face different sizes of candidate resource moment sets, and the number of candidate resources gradually decreases or even disappears.

[0079] S105. Select an unoccupied first time-frequency resource from the m candidate resource selection moments based on the resource sensing result determined at each candidate resource selection moment, and select a target time-frequency resource for auxiliary link communication from the first time-frequency resources. The resource sensing result is used to represent the resource sensing status at each candidate resource selection moment.

[0080] Specifically, obtaining resource perception results of m candidate resource selection moments within a resource perception window corresponding to the resource selection trigger moment;

[0081] Based on the resource sensing result, an occupied candidate resource selection time among the m candidate resource selection time moments is determined to select an unoccupied first time-frequency resource, and a target time-frequency resource for auxiliary link communication is selected from the first time-frequency resource.

[0082] Based on the resource perception window corresponding to each resource selection trigger moment n, the resource perception results determined at the m candidate resource selection moments are obtained to obtain the time-frequency resources occupied (reserved) by other V2X devices at these candidate resource selection moments. These time-frequency resources are then excluded to obtain the available time-frequency resources not occupied by other V2X devices. Finally, the target time-frequency resources for auxiliary link communication are selected from these available time-frequency resources, thereby effectively avoiding resource collisions with other V2X devices and improving the data communication quality of the auxiliary link communication.

[0083] The following combination Figure 7 , an example is given to illustrate the implementation principle of the resource selection method when the resource reselection mechanism triggered by resource re-evaluation is introduced into the partial perception mechanism of this embodiment:

[0084] For the resource selection at time n (i.e. Resource (re-)selection triggered in the figure), pre-select X candidate resource moments (i.e. Xinstances in the figure) within the resource selection window [n+T1, n+T2] (i.e. selection window1 in the figure);

[0085] For every X candidate resource moments, there are Z candidate resource moments (i.e., Z instances in the diagram). The resource reselection mechanism triggered by resource re-evaluation now corresponds to slot m and slot k. Resources in slot m and k can be used to transmit the same TB twice: the initial transmission uses the resources in slot m, and the retransmission uses the resources in slot k.

[0086] When resource reselection is triggered by resource re-evaluation after the resource selection trigger time n and before the packet delay budget PDB (i.e., Remaining PDB in the figure), the resource reselection trigger time is marked as m-T3 (Resource (re-)evaluation triggered in the figure), and the Z candidate resource times corresponding to the time m after the resource reselection trigger time m-T3 are all used as candidate resource selection times for the resource reselection trigger time m-T3, ensuring that there are enough candidate resources at the resource reselection trigger time m-T3.

[0087] The implementation principles of resource selection at other resource reselection triggering moments are similar to the above, as well as the implementation principles of the resource selection method when the resource reselection mechanism triggered by resource seizure is introduced into the partial perception mechanism, so they will not be repeated here.

[0088] In addition, in this embodiment, the auxiliary link resource pool is provided to support both periodic and non-periodic services.

[0089] When performing the above-mentioned resource selection for auxiliary link communication in the first terminal device, for each selected candidate resource moment, a method for determining a resource sensing moment within the resource sensing window based on the partial resource sensing mechanism is as follows:

[0090] The resource reservation that the first terminal device needs to perceive includes periodic reservation and aperiodic reservation. For the perception of periodic reservation, for the first terminal device, the physical time slot number of the selected candidate resource time slot y is marked as t y , the first terminal device will perceive the resource reservation information of other second terminal devices.

[0091] The first terminal device will determine the time slot t y A corresponding set of sensing time slots Among them, μ is related to the subcarrier spacing, as shown in the following table, and m is configured by the network according to the carrier type and the service cycle of the periodic service supported by the auxiliary link resource pool. The perception result predicts the t y The time-frequency resources occupied by the second terminal device in the time slot.

[0092] μ <![CDATA[Δf=2 μ ·15[kHz]]]> cyclic prefix 0 15 Normal(Nromal) 1 30 Normal(Nromal) 2 60 Normal, Extended 3 120 Normal(Nromal)

[0093] Assuming that ty1 is the physical time slot with the smallest physical time slot number, X=100, and the subcarrier spacing is 15 kHz, it can be obtained from Table 1 that μ=0. At this time, X×2μ=100, then the first terminal device determines that the starting time domain position of the resource perception window for obtaining non-periodic resource reservation information is t y1-100 If the first terminal device's perception processing time is tproc,0, the resource perception window can be marked as [t y1-100 ,n-tproc,0), as shown in the gray rectangle in the figure. It should be noted that the value of X is not limited to 100. In other feasible implementations, it can also be other values, which depends on the configuration or pre-configuration of the network device.

[0094] The value of m in the above embodiment is described in detail below.

[0095] When the carrier type indicates that the auxiliary link carrier is a dedicated carrier of the intelligent traffic system (ITS) or a shared carrier of frequency division duplex (FDD), the resources in the auxiliary link resource pool include uplink resources but no resources for downlink. The first terminal device does not need to exclude the resources for downlink from the auxiliary link resource pool. Therefore, the value set of m is the same as the service cycle of the periodic service supported by the auxiliary link resource pool, which depends 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}.

[0096] When the carrier type indicates that the auxiliary link carrier is a frequency division duplex (TDD) shared carrier, the resources in the auxiliary link resource pool include resources for downlink and resources for uplink. The first terminal device needs to exclude the resources for downlink from the auxiliary link resource pool. For example, the service cycle of a periodic service is 100ms, and data cannot be sent on the downlink resources. Therefore, the value set of is associated with the service cycle of the periodic service supported by the auxiliary link resource pool, and is a value set that can be uniquely obtained by the reserved period set.

[0097] like Figure 8 As shown, for the perception of non-periodic reservation, the first terminal device first determines the starting time domain position of the non-periodic resource perception window. The determination method is:

[0098] Let the time slot offset be X', where X' represents the maximum interval between multiple transmissions reserved for a transport block TB in NR V2X communication. At this time, the starting time domain position of the resource awareness window of the non-periodic resource is the time slot t y-X‘ The first terminal device may also determine the end time domain position of the non-periodic resource perception window according to other methods. In other methods, the first terminal device determines whether the time n is included in the auxiliary link resource pool. The time slot in the auxiliary link resource pool is the time slot for auxiliary link communication. n is the time when the first terminal device triggers resource selection. If t n is included in the auxiliary link resource pool, the first terminal device determines that the end domain position of the resource perception window is time slot t n-1 , t n is the physical time slot number at time n; if time slot t n If it is not included in the auxiliary link resource pool, the first terminal device determines that the end domain position of the resource perception window is time slot t m-1 , time slot t m is the distance time slot t in the preset auxiliary link time slot set n The latest and located in time slot t nIn the subsequent time slots, the first user senses all auxiliary link resources included in the non-periodic resource sensing window.

[0099] Among them, when the first terminal device selects time-frequency resources for auxiliary link communication, in addition to excluding time-frequency resources occupied non-periodically by the second terminal device from all candidate time slots, it also needs to exclude time-frequency resources occupied periodically by the second terminal device.

[0100] In this embodiment, for resource selection performed at time n, X candidate resource moments are preselected within the resource selection window [n+T1, n+T2], and for each of the X candidate resource moments, Z candidate resource moments are preselected within the resource selection window [x+T1, x+T2]. For resource reselection triggered by re-evaluation and pre-emption that occurs after time n and before PDB, the m candidate resources contained in the resource selection window corresponding to the resource reselection triggering moment are used as the candidate resource moments for the new triggering moment. That is, the present invention enhances the mechanism for determining candidate resource selection moments in the partial sensing mechanism. For each possible resource reselection moment triggered by re-evaluation and pre-emption, sufficient candidate resources are ensured when resource reselection is performed at any of the X candidate resource moments. This reduces the incidence of V2X devices failing to successfully transmit data due to resource collisions, thereby improving the reliability of resource selection and effectively increasing the success rate of auxiliary link data transmission.

[0101] Example 2

[0102] like Figure 9 As shown, the resource selection system for auxiliary link communication in this embodiment includes a first pre-selection module 1, a second pre-selection module 2, a reselection trigger time acquisition module 3, a candidate resource selection time determination module 4 and a time-frequency resource selection module 5.

[0103] The first pre-selection module 1 is used to pre-select X first candidate resource moments within the resource selection window corresponding to the resource selection trigger moment; wherein X is greater than or equal to a first set threshold;

[0104] In the partial perception (local perception) mode, when the V2X device triggers resource selection at time n, X candidate resource times are selected in advance within the resource selection window [n+T1, n+T2].

[0105] The second pre-selection module 2 is configured to pre-select Z second candidate resource moments within a resource selection window corresponding to each of the first candidate resource moments; wherein Z is greater than or equal to a second set threshold;

[0106] X and Z are both configured or pre-configured by the network-side device.

[0107] Specifically, the values ​​of X, Z, and m can be reconfigured or adjusted to meet auxiliary link communication scenarios with different communication requirements, thereby further improving the versatility and reliability of resource selection.

[0108] In order to avoid the situation where there are few or even no candidate resources when reselecting resources at any of the X candidate resource moments, resulting in resource reselection failure, Z candidate resource moments are pre-selected within the resource selection window [x+T1, x+T2] corresponding to each of the X candidate resource moments (e.g., marked as x). This ensures that there are sufficient candidate resources when reselecting resources at any of the X candidate resource moments. In other words, the mechanism for determining the candidate resource selection moment in the partial perception mechanism is enhanced, reducing the incidence of V2X devices failing to successfully transmit data due to resource collisions, thereby effectively improving the reliability of resource selection and, in turn, the success rate of auxiliary link data transmission.

[0109] The reselection triggering time acquisition module 3 is used to obtain the resource reselection triggering time between the resource selection triggering time and the data packet delay budget PDB;

[0110] The resource reselection triggering moment is a moment between the resource selection triggering moment and the data packet delay budget PDB, triggered by a resource reselection mechanism of resource re-evaluation or resource seizure.

[0111] When a resource reselection mechanism triggered by resource re-evaluation and resource forcible seizure is introduced into a partial perception (i.e., local perception) mechanism, resource reselection is performed based on the above-mentioned resource selection method for the resource reselection moment triggered by resource re-evaluation or resource forcible seizure that occurs after the resource selection trigger moment n and before the data packet delay budget PDB, so as to solve the problem that there are few or no candidate resources in the existing resource reselection mechanism triggered by resource re-evaluation and resource forcible seizure introduced into the partial perception mechanism.

[0112] The candidate resource selection moment determination module 4 is configured to use the m second candidate resource moments contained in the resource selection window corresponding to the resource reselection trigger moment as candidate resource selection moments for the resource reselection trigger moment; wherein m is greater than or equal to a third set threshold and less than or equal to Z;

[0113] The m candidate resource selection moments of the resource reselection triggering moment are selected so that each resource reselection triggering moment has sufficient candidate resources, which greatly improves the success rate of auxiliary link data transmission.

[0114] In addition, for each possible resource reselection moment triggered by re-evaluation and preemption, the corresponding candidate resource moment set has the same size (m=Z), further ensuring that there are enough candidate resources when resource reselection is performed at any of the X candidate resource moments, avoiding the situation where the existing candidate resource moments face different sizes of candidate resource moment sets, and the number of candidate resources gradually decreases or even disappears.

[0115] The time-frequency resource selection module 5 is used to select an unoccupied first time-frequency resource from the m candidate resource selection moments according to the resource perception result determined at each candidate resource selection moment, and select a target time-frequency resource for auxiliary link communication from the first time-frequency resource.

[0116] The resource perception result is used to characterize the resource perception status at each candidate resource selection moment.

[0117] Specifically, the time-frequency resource selection module 5 includes a perception result acquisition unit 6 and a time-frequency resource selection unit 7 .

[0118] The perception result acquisition unit 6 is used to obtain the resource perception results determined by the m candidate resource selection moments within the resource perception window corresponding to the resource selection trigger moment;

[0119] The time-frequency resource selection unit 7 is used to determine the occupied candidate resource selection time among the m candidate resource selection time moments based on the resource perception result to select the unoccupied first time-frequency resource, and select the target time-frequency resource for auxiliary link communication from the first time-frequency resource.

[0120] Based on the resource perception window corresponding to each resource selection trigger moment n, the resource perception results determined at the m candidate resource selection moments are obtained to obtain the time-frequency resources occupied (reserved) by other V2X devices at these candidate resource selection moments. These time-frequency resources are then excluded to obtain the available time-frequency resources not occupied by other V2X devices. Finally, the target time-frequency resources for auxiliary link communication are selected from these available time-frequency resources, thereby effectively avoiding resource collisions with other V2X devices and improving the data communication quality of the auxiliary link communication.

[0121] The following combination Figure 7 , an example is given to illustrate the implementation principle of the resource selection method when the resource reselection mechanism triggered by resource re-evaluation is introduced into the partial perception mechanism of this embodiment:

[0122] For the resource selection at time n (i.e. Resource (re-)selection triggered in the figure), pre-select X candidate resource moments (i.e. Xinstances in the figure) within the resource selection window [n+T1, n+T2] (i.e. selection window1 in the figure);

[0123] For every X candidate resource moments, there are Z candidate resource moments (i.e., Z instances in the diagram). The resource reselection mechanism triggered by resource re-evaluation now corresponds to slot m and slot k. Resources in slot m and k can be used to transmit the same TB twice: the initial transmission uses the resources in slot m, and the retransmission uses the resources in slot k.

[0124] When resource reselection is triggered by resource re-evaluation after the resource selection trigger time n and before the packet delay budget PDB (i.e., Remaining PDB in the figure), the resource reselection trigger time is marked as m-T3 (Resource (re-)evaluation triggered in the figure), and the Z candidate resource times corresponding to the time m after the resource reselection trigger time m-T3 are all used as candidate resource selection times for the resource reselection trigger time m-T3, ensuring that there are enough candidate resources at the resource reselection trigger time m-T3.

[0125] The implementation principles of resource selection at other resource reselection triggering moments are similar to the above, as well as the implementation principles of the resource selection method when the resource reselection mechanism triggered by resource seizure is introduced into the partial perception mechanism, so they will not be repeated here.

[0126] In addition, the principle of determining the resource sensing time within the resource sensing window based on the partial resource sensing mechanism is specifically described in the corresponding content of Example 1, and will not be repeated here.

[0127] In this embodiment, for resource selection performed at time n, X candidate resource moments are preselected within the resource selection window [n+T1, n+T2], and for each of the X candidate resource moments, Z candidate resource moments are preselected within the resource selection window [x+T1, x+T2]. For resource reselection triggered by re-evaluation and pre-emption that occurs after time n and before PDB, the m candidate resources contained in the resource selection window corresponding to the resource reselection triggering moment are used as the candidate resource moments for the new triggering moment. That is, the present invention enhances the mechanism for determining candidate resource selection moments in the partial sensing mechanism. For each possible resource reselection moment triggered by re-evaluation and pre-emption, sufficient candidate resources are ensured when resource reselection is performed at any of the X candidate resource moments. This reduces the incidence of V2X devices failing to successfully transmit data due to resource collisions, thereby improving the reliability of resource selection and effectively increasing the success rate of auxiliary link data transmission.

[0128] Example 3

[0129] Figure 10 This is a schematic diagram of the structure of an electronic device provided in Example 3 of the present invention. The electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the resource selection method for auxiliary link communication in Example 1 is implemented. Figure 10 The electronic device 30 shown is only an example and should not limit the functionality and scope of use of the embodiments of the present invention.

[0130] like Figure 10 As shown, the electronic device 30 may be a general-purpose computing device, such as a server device. Components of the electronic device 30 may include, but are not limited to, the at least one processor 31, the at least one memory 32, and a bus 33 connecting different system components (including the memory 32 and the processor 31).

[0131] The bus 33 includes a data bus, an address bus, and a control bus.

[0132] The memory 32 may include a volatile memory, such as a random access memory (RAM) 321 and / or a cache memory 322 , and may further include a read-only memory (ROM) 323 .

[0133] The memory 32 may also include a program / utility 325 having a set (at least one) of program modules 324, such program modules 324 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment.

[0134] The processor 31 executes various functional applications and data processing by running the computer program stored in the memory 32, such as the resource selection method for auxiliary link communication in embodiment 1 of the present invention.

[0135] The electronic device 30 may also communicate with one or more external devices 34 (e.g., a keyboard, a pointing device, etc.). Such communication may be performed via an input / output (I / O) interface 35. Furthermore, the model generating device 30 may also communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) via a network adapter 36. Figure 10 As shown, the network adapter 36 communicates with the other modules of the model-generated device 30 via the bus 33. It should be understood that, although not shown in the figures, other hardware and / or software modules may be used in conjunction with the model-generated device 30, including but not limited to microcode, device drivers, redundant processors, external disk drive arrays, RAID (RAID) systems, tape drives, and data backup storage systems.

[0136] It should be noted that although several units / modules or sub-units / modules of the electronic device are mentioned in the detailed description above, this division is merely exemplary and not mandatory. In fact, according to embodiments of the present invention, the features and functions of two or more units / modules described above may be embodied in a single unit / module. Conversely, the features and functions of a single unit / module described above may be further divided and embodied by multiple units / modules.

[0137] Example 4

[0138] This embodiment provides a computer-readable storage medium having a computer program stored thereon. When the program is executed by a processor, the steps in the resource selection method for auxiliary link communication in Embodiment 1 are implemented.

[0139] The readable storage medium may include, but is not limited to, a portable disk, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory, an optical storage device, a magnetic storage device, or any suitable combination thereof.

[0140] In a possible implementation manner, the present invention may also be implemented in the form of a program product, which includes program code. When the program product is run on a device, the program code is used to enable the device to execute the steps in the resource selection method for auxiliary link communication in embodiment 1.

[0141] The program code for executing the present invention may be written in any combination of one or more programming languages, and may be executed entirely on the user device, partially on the user device, as a standalone software package, partially on the user device and partially on a remote device, or entirely on the remote device.

[0142] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications are intended to fall within the scope of the present invention.

Claims

1. A resource selection method for auxiliary link communication, wherein the resource selection method is applied in a V2X device, characterized in that: The resource selection method includes: Pre-selecting X first candidate resource moments within a resource selection window corresponding to a resource selection trigger moment; wherein X is greater than or equal to a first set threshold; Pre-selecting Z second candidate resource moments within a resource selection window corresponding to each of the first candidate resource moments; wherein Z is greater than or equal to a second set threshold; Obtaining a resource reselection triggering moment between the resource selection triggering moment and a data packet delay budget PDB; The resource reselection triggering moment is a moment between the resource selection triggering moment and the data packet delay budget PDB, triggered by a resource reselection mechanism of resource re-evaluation or resource seizure; Using m second candidate resource moments contained in the resource selection window corresponding to the resource reselection trigger moment as candidate resource selection moments for the resource reselection trigger moment; wherein m is greater than or equal to a third set threshold and less than or equal to Z; According to the resource perception result determined at each candidate resource selection moment, an unoccupied first time-frequency resource is selected from the m candidate resource selection moments, and a target time-frequency resource for auxiliary link communication is selected from the first time-frequency resources.

2. The resource selection method for auxiliary link communication according to claim 1, wherein: X and Z are both configured or pre-configured by the network-side device.

3. The resource selection method for auxiliary link communication according to claim 1, wherein: The step of selecting an unoccupied first time-frequency resource from the m candidate resource selection moments according to the resource sensing result determined at each candidate resource selection moment, and selecting a target time-frequency resource for auxiliary link communication from the first time-frequency resources includes: Obtaining resource perception results determined by the m candidate resource selection moments within the resource perception window corresponding to the resource selection trigger moment; Based on the resource sensing result, an occupied candidate resource selection time among the m candidate resource selection time moments is determined to select an unoccupied first time-frequency resource, and a target time-frequency resource for auxiliary link communication is selected from the first time-frequency resources.

4. The resource selection method for auxiliary link communication according to any one of claims 1 to 3, characterized in that: m=Z.

5. A resource selection system for auxiliary link communication, wherein the resource selection system is applied in a V2X device, characterized in that: The resource selection system includes: A first pre-selection module is configured to pre-select X first candidate resource moments within a resource selection window corresponding to a resource selection trigger moment; wherein X is greater than or equal to a first set threshold; A second pre-selection module is configured to pre-select Z second candidate resource moments within a resource selection window corresponding to each of the first candidate resource moments; wherein Z is greater than or equal to a second set threshold; a reselection triggering moment acquisition module, configured to acquire a resource reselection triggering moment between the resource selection triggering moment and the packet delay budget PDB; the resource reselection triggering moment being a moment between the resource selection triggering moment and the packet delay budget PDB triggered by a resource reselection mechanism caused by resource reassessment or resource seizure; a candidate resource selection moment determination module, configured to use m second candidate resource moments contained in a resource selection window corresponding to the resource reselection trigger moment as candidate resource selection moments for the resource reselection trigger moment; wherein m is greater than or equal to a third set threshold and less than or equal to Z; A time-frequency resource selection module is used to select an unoccupied first time-frequency resource from m candidate resource selection moments according to the resource perception result determined at each candidate resource selection moment, and select a target time-frequency resource for auxiliary link communication from the first time-frequency resource.

6. The resource selection system for auxiliary link communication according to claim 5, wherein: X and Z are both configured or pre-configured by the network-side device.

7. The resource selection system for auxiliary link communication according to claim 5, wherein: The time-frequency resource selection module includes: A perception result acquisition unit, configured to acquire resource perception results determined at the m candidate resource selection moments within a resource perception window corresponding to the resource selection trigger moment; A time-frequency resource selection unit is used to determine the occupied candidate resource selection time among the m candidate resource selection time moments based on the resource perception result to select the unoccupied first time-frequency resource, and select the target time-frequency resource for auxiliary link communication from the first time-frequency resource.

8. The resource selection system for auxiliary link communication according to any one of claims 5 to 7, characterized in that: m=Z.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the resource selection method for auxiliary link communication according to any one of claims 1 to 4 is implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the resource selection method for auxiliary link communication according to any one of claims 1 to 4 are implemented.

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