WO2021204133A1

WO2021204133A1 - Resource selection method and device for auxiliary link, storage medium, and terminal

Info

Publication number: WO2021204133A1
Application number: PCT/CN2021/085762
Authority: WO
Inventors: 曲鑫
Original assignee: 北京紫光展锐通信技术有限公司
Priority date: 2020-04-09
Filing date: 2021-04-07
Publication date: 2021-10-14
Also published as: CN113518321B; CN113518321A

Abstract

A resource selection method and device for an auxiliary link, a storage medium, and a terminal. The method comprises: determining, according to control information received within other time slots in a sensing window, resource reservation information of a half duplex time slot (S101), wherein the other time slots refer to time slots other than the half duplex time slot in the sensing window, and the half duplex time slot refers to a time slot in the sensing window in which auxiliary link data transmission is performed; and excluding reserved resources in a selection window at least according to the resource reservation information of the half duplex time slot, so as to obtain candidate resources (S102). The present invention provides an improved auxiliary link resource selection solution, which enables reserved resources to be accurately excluded while reserving, in a selection window, as many candidate resources as possible.

Description

Resource selection method and device for auxiliary link, storage medium and terminal

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on April 9, 2020, the application number is 202010276236.3, and the invention title is "Resource selection method and device for auxiliary link, storage medium, and terminal", all of which The content is incorporated in this application by reference.

Technical field

The present invention relates to the field of communication technology, in particular to a resource selection method and device, storage medium, and terminal for auxiliary links.

Background technique

With the development of the 3rd Generation Partnership Project (3GPP), the information exchange (vehicle to X, V2X for short) between New Radio (NR, also called New Radio) vehicles to the outside world, It can also be called vehicle to everything, as a key technical direction of the 16th (Release 16, R16 for short) version of the protocol is under study. NR V2X, as an enhancement of Long Term Evolution (LTE) V2X technology, is a key technical means to enable vehicle networks.

V2X technology includes two resource acquisition methods: one method is a resource allocation method that requires resource scheduling by the base station, which corresponds to mode 3 (mode 3) in LTE V2X and mode 1 (mode 1) in NR V2X; the other The method is based on resource selection based on perception, and is a resource allocation method that does not require resource scheduling by the base station. It includes mode 4 in LTE V2X and mode 2 in NR V2X.

For the perception-based resource selection method, the secondary link user (referred to as the user) selects resources in the secondary link resource pool through the perception method, and the resource pool is configured or pre-configured by the network. The resource pool includes time domain resources and frequency domain resources, and a minimum resource unit of the resource pool is called a subchannel. In NR V2X, one subchannel occupies one slot in the time domain and M resource blocks (Resource Block, RB for short) in the frequency domain, where M is configured or pre-configured by the network. When the secondary link user selects resources in the resource pool, according to the size of the data packet, it is determined that L subchannels are required for transmission. Then, according to the sensing result, L continuous sub-channels on a certain time slot are selected in the resource pool.

However, when an NR V2X user uses mode 2 to perform resource selection operations, the user cannot receive auxiliary link transmissions sent by other users due to its own auxiliary link transmission in certain time slots within the perception window, and thus cannot obtain other auxiliary link transmissions. Information about the user's resource reservation. When this happens, the user cannot effectively exclude the reserved resources of other users in the selection window, and the resources selected by the user are likely to overlap with the resources reserved by other users.

Summary of the invention

The technical problem solved by the present invention is to provide an improved auxiliary link resource selection scheme.

In order to solve the above technical problem, an embodiment of the present invention provides a resource selection method for a secondary link, which includes: determining resource reservation information of a half-duplex time slot according to control information received in other time slots of a sensing window, where , The other time slots refer to time slots in the sensing window other than the half-duplex time slot, and the half-duplex time slot refers to the time slot for auxiliary link data transmission within the sensing window; at least according to the The resource reservation information of the half-duplex time slot excludes the reserved resources in the selection window to obtain candidate resources.

Optionally, the determining the resource reservation information of the half-duplex time slot according to the control information received in other time slots of the sensing window includes: determining the time-frequency of the resource used in the half-duplex time slot according to the control information Domain position and reservation period; according to the time-frequency domain position and reservation period of the used resource, determine the corresponding resource of the used resource after one or more reservation periods to obtain the half-duplex time slot Resource reservation information.

Optionally, the determining, according to the control information, the time-frequency domain position of the resource used in the half-duplex time slot and the reserved period includes: for the same other user, according to the control sent by the other user in the other time slot At least one of the information determines the time-frequency domain position and the reserved period of the resources used by the other users in the half-duplex time slot, where the other users refer to those who send control information in other time slots of the perception window user.

Optionally, the control information includes: a time interval field, a frequency domain information indication field, and the reserved period; the time-frequency domain position of the resource used in the half-duplex time slot is determined according to the control information, and The reservation period includes: determining that the half-duplex time slot has a resource to be used according to the time interval field; determining the frequency domain position of the used resource according to the frequency domain information indication field; The retention period is determined as the reservation period of the used resource.

Optionally, the determining, according to the control information, the time-frequency domain position and the reserved period of the resources used in the half-duplex time slot includes: when a backward indication of the resource is supported, according to the control information of the other time slot Any control information in the half-duplex time slot is used to determine the time-frequency domain position of the resource used in the half-duplex time slot and the reserved period; when the backward indication of resources is not supported, according to the other time slots earlier than the half-duplex time slot The control information of the other time slots of, determines the time-frequency domain position and the reserved period of the resources used in the half-duplex time slot.

Optionally, the excluding the reserved resources in the selection window at least according to the resource reservation information of the half-duplex time slot to obtain candidate resources includes: excluding the resource reservation of the half-duplex time slot in the selection window The reserved resources indicated by the information, and the remaining resources are determined as the candidate resources.

Optionally, the excluding the reserved resources in the selection window at least according to the resource reservation information of the half-duplex time slot to obtain the candidate resources includes: comparing measurements on resources carrying the control information in the sensing window When the comparison result shows that the signal strength is lower than the reference signal strength threshold, the reserved resource indicated by the resource reservation information of the half-duplex time slot is determined as the candidate resource one.

Optionally, the reference signal strength threshold is determined according to network configuration or pre-configuration.

Optionally, there are multiple other users within the sensing window that send the control information in the other time slots, and the comparing the signal strength measured on the resource carrying the control information in the sensing window with a reference The signal strength threshold includes: for each other user, a resource used by at least one control information sent by the other user in the other time slot is selected to measure the signal strength, and the signal strength is compared with the reference signal strength threshold.

Optionally, the excluding the reserved resources in the selection window at least according to the resource reservation information of the half-duplex time slot to obtain candidate resources includes: in the frequency domain, removing the resource reservation information of the half-duplex time slot The part outside the frequency domain location where the indicated reserved resource is located is recorded as the first frequency domain part; for the first frequency domain part, all candidate reserved time slots in the selection window are excluded from corresponding to the first frequency domain Part of the resource to obtain the candidate resource.

Optionally, all candidate reserved time slots in the selection window refer to time slots that fall into the selection window in a time slot group obtained by the half-duplex time slot after a preset reserved period set.

Optionally, the resource selection method further includes: selecting a resource from the candidate resources as the transmission resource according to the size of the data packet to be transmitted.

In order to solve the above technical problem, an embodiment of the present invention also provides a resource selection device for a secondary link, including: a determining module, configured to determine the half-duplex time slot based on the control information received in other time slots of the sensing window Resource reservation information, where the other time slots refer to time slots other than the half-duplex time slot in the sensing window, and the half-duplex time slot refers to the time when auxiliary link data transmission is performed in the sensing window. Slot; an exclusion module, configured to exclude reserved resources in the selection window at least according to the resource reservation information of the half-duplex time slot to obtain candidate resources.

In order to solve the above technical problem, an embodiment of the present invention further provides a storage medium on which computer instructions are stored, and the computer instructions execute the steps of the above method when the computer instructions are executed by a processor.

In order to solve the above technical problem, an embodiment of the present invention also provides a terminal, which includes the above-mentioned resource selection device for the auxiliary link, or includes a memory and a processor, and the memory is stored that can run on the processor. When the processor executes the computer instructions, the steps of the above method are executed.

Compared with the prior art, the technical solution of the embodiment of the present invention has the following beneficial effects:

The embodiment of the present invention provides a resource selection method for a secondary link, including: determining resource reservation information of a half-duplex time slot according to control information received in other time slots of a sensing window, wherein the other time slots Refers to the time slots in the sensing window other than the half-duplex time slot. The half-duplex time slot refers to the time slot for secondary link data transmission in the sensing window; at least according to the resource prediction of the half-duplex time slot The reserved information excludes the reserved resources in the selection window to obtain candidate resources.

Compared with the existing auxiliary link resource selection selection process, the solution of the present invention provides an improved auxiliary link resource selection solution, which can accurately exclude reserved resources while retaining as many candidate resources as possible in the selection window. Specifically, when the secondary link transmission is performed in certain time slots (that is, the half-duplex time slot) within the sensing window, and the secondary link transmission sent by other users cannot be received, the resources reserved by other users cannot be obtained. In the case of information, the solution of this embodiment uses the relevant indications in the auxiliary link transmission information received on other time slots within the sensing window to determine the resource reservation of the half-duplex time slot. Therefore, although it is not possible to receive information about resource reservation by other users in the half-duplex time slot, it can still be used according to the relevant instructions for periodic resource reservation and multiple transmission resource reservation in the control information received in other time slots. The resource reservation of the half-duplex time slot can be reasonably deduced. Therefore, it can be ensured that the reserved resources of other users will not be missed when the reserved resources are excluded from the selection window. Further, compared with the resource selection solution used in the prior art that excludes all possible reserved periods, the solution of this embodiment can accurately determine the reserved resources of other users. Therefore, the user who executes the solution of this embodiment does not need to make all possible reservations. All resources in the reserved period are eliminated, making it possible to reserve as many candidate resources as possible in the selection window for data transmission on the auxiliary link.

Further, the excluding the reserved resources in the selection window at least according to the resource reservation information of the half-duplex time slot to obtain candidate resources includes: in the frequency domain, except for the resource reservation information of the half-duplex time slot as indicated The part outside the frequency domain location where the reserved resource is located is recorded as the first frequency domain part; for the first frequency domain part, all candidate reserved time slots in the selection window corresponding to the first frequency domain part are excluded Resource to obtain the candidate resource. Therefore, for the indeterminate resource occupation part, in the subsequent resource selection process, all possible cycles are excluded from resources. Wherein, the undeterminable resource occupation part may refer to the frequency domain part where the relevant indication information is not found in other time slots of the sensing window. Compared with the prior art method of excluding all frequency bands of all possible reserved periods, the solution of this embodiment only excludes undeterminable frequency bands from all possible reserved periods, thereby reasonably retaining more candidate resources.

Description of the drawings

FIG. 1 is a schematic diagram of a resource selection and reservation method of NR V2X mode 2 in the prior art;

Figure 2 is a schematic diagram of another NR V2X mode 2 resource selection and reservation method in the prior art;

FIG. 3 is a flowchart of a method for selecting a resource for a secondary link according to an embodiment of the present invention;

FIG. 4 is a flowchart of a specific implementation of step S101 in FIG. 3;

FIG. 5 is a flowchart of a specific implementation of step S102 in FIG. 3;

FIG. 6 is a schematic diagram of a first typical application scenario of an embodiment of the present invention;

FIG. 7 is a schematic diagram of a second typical application scenario of an embodiment of the present invention;

FIG. 8 is a flowchart of another specific implementation manner of step S102 in FIG. 3;

FIG. 9 is a schematic diagram of a third typical application scenario of an embodiment of the present invention;

FIG. 10 is a schematic structural diagram of a resource selection device for a secondary link according to an embodiment of the present invention.

Detailed ways

As mentioned in the background art, the existing perception-based resource selection process has many shortcomings, which leads to overlapping of resource selection among different users in the selection window.

Specifically, FIG. 1 and FIG. 2 show schematic diagrams of existing R V2X mode 2 resource selection and reservation methods. Referring to Figures 1 and 2, the time when user 3 triggers the resource (re)selection is n, then it selects the secondary link sending resource (resource for short) in the resource selection time window (ie, the selection window shown in the figure) for the secondary chain Road data transmission. The start time domain position of the selection window is n+T1, and the end time domain position is n+T2. Among them, T1 depends on user implementation and needs to meet 0≤T1≤T _proc,1 , T2 depends on user implementation and needs to meet less than the remaining Packet Delay Budget (PDB), T _proc,1 is user data processing time.

The user excludes resources occupied by other users in the selection window according to the perception result in the resource perception window (may be referred to as the perception window for short) according to the resource exclusion mechanism, and finally reports Z% of the available candidate resources of the total number of candidate resources in the selection window. Among them, the value of Z contains at least 20. The higher layer randomly selects a transmission resource among the reported candidate resources.

As shown in Figure 1 and Figure 2, the time domain range of the perception window is [n-X, n), where X is the network configuration or pre-configuration, which can be selected from (1000+100) milliseconds and 100 milliseconds.

Furthermore, NR V2X supports periodic reservation of resources and reservation of resources for multiple transmissions.

Reserve resources periodically:

As shown in Figure 1 and Figure 2, after user 1 selects resource 1 as the transmission resource, when the secondary link physical layer control channel (PSCCH) and the secondary link physical layer data channel ( When Physical Sidelink Shared Channel, PSSCH for short), a period indicator field is carried in the control channel (PSCCH), indicating that the resource (that is, resource 1) is separated from the period (that is, the reserved period P1 in the figure) and the corresponding resource is also It is reserved and occupied by the user.

When other users, such as user 3, receive the PSCCH on resource 1 and successfully decode it, it is possible to know which resource is also reserved and occupied by user 1. Therefore, when the user 3 selects resources in the selection window, those resources that have been reserved and occupied can be excluded to avoid collisions of transmission resources.

Reserved resources for multiple transmissions:

NR V2X also supports the reservation of resources for multiple transmissions based on blind retransmission and hybrid automatic repeat reQuest (HARQ) feedback. Referring to FIG. 1, when user 1 transmits PSCCH and PSSCH on resource 1, it also carries a time interval indicator field and frequency domain information indicator field in the control channel (ie, PSCCH).

Wherein, the time interval indicator field can indicate the time interval between resource 2, resource 3 and resource 1, and the frequency domain information indicator field can indicate the starting position of resource 2 and resource 3 in the frequency domain and the number of subchannels included. For resource 1, resource 2 and resource 3, the number of sub-channels included therein is equal.

When other users receive PSCCH on resource 1 and decode it successfully, they can know that resource 2 and resource 3 are also reserved and occupied by the user. When other users select resources, they can exclude those that have been reserved. Occupied resources to avoid collision of transmission resources.

Similar to LTE V2X, NR V2X also cannot receive secondary link control information sent by other users due to the transmission of secondary link data, resulting in the inability to obtain other user resource reservation information. As shown in Figure 2, user 1 and user 2 both send secondary link data in time slot n-k1, and the control information of user 1 indicates that the same frequency domain resources after the reserved period P1 are reserved, and the control information of user 2 indicates Reserve the same frequency domain resources after the reserved period P2. The resources occupied by different users are distinguished by different filling patterns.

However, because user 3 also transmits data on the secondary link in time slot n-k1, and cannot receive and send at the same time due to half-duplex, user 3 cannot receive the secondary link sent by user 1 and user 2 in time slot n-k1 Control information, so the reservation information of user 1 and user 2 cannot be obtained. Therefore, when user 3 selects resources in the selection window, the reserved resources of user 1 and user 2 cannot be effectively excluded, which causes the resources selected by user 3 to overlap with the resources reserved by user 1 and user 2, and transmission collision occurs.

To solve this problem, LTE V2X introduced a design that excludes all possible reserved cycles. That is, when a user who performs resource (re)selection (such as user 3 in Fig. 2) transmits in a certain time slot within the sensing window, the time slot is added to the set of reserved periods supported by LTE to obtain a set of Time slot. For the time slots in the group of time slots that fall into the selection window (corresponding to the area defined by the four black borders in the selection window in Figure 2 without filling), all frequency domain resources on these time slots will be excluded, and no resource selection will be performed on them .

If the design method that excludes all possible reserved cycles in LTE V2X is applied to NR V2X. Because NR V2X supports more flexible reservation cycles, such as including 0,[1:99],100,200,300,400,500,600,700,800,900,1000ms. When the method of excluding all possible reserved periods is adopted, it will result in too few or no resources to choose from in the selection window.

The solution of the present invention provides an improved auxiliary link resource selection solution, which can reserve as many candidate resources as possible in the selection window while accurately excluding reserved resources. Specifically, when the secondary link transmission is performed in certain time slots (that is, the half-duplex time slot) within the sensing window, and the secondary link transmission sent by other users cannot be received, the resources reserved by other users cannot be obtained. Information time. The solution of this embodiment uses the relevant indications in the auxiliary link transmission information received on other time slots within the sensing window to determine the resource reservation of the half-duplex time slot. Therefore, although it is not possible to receive information about resource reservation by other users in the half-duplex time slot, it can still be used according to the relevant instructions for periodic resource reservation and multiple transmission resource reservation in the control information received in other time slots. The resource reservation of the half-duplex time slot can be reasonably deduced. Therefore, it can be ensured that the reserved resources of other users will not be missed when the reserved resources are excluded from the selection window. Further, compared with the resource selection solution used in the prior art that excludes all possible reserved periods, the solution of this embodiment can accurately determine the reserved resources of other users. Therefore, the user who executes the solution of this embodiment does not need to make all possible reservations. All resources in the reserved period are eliminated, making it possible to reserve as many candidate resources as possible in the selection window for data transmission on the auxiliary link.

In order to make the above objectives, features and beneficial effects of the present invention more obvious and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Fig. 3 is a flowchart of a resource selection method for a secondary link according to an embodiment of the present invention. This embodiment can be applied to NR V2X scenarios, such as being executed by NV V2X users. The user is user equipment (User Equipment, UE for short).

Specifically, when NR V2X users trigger (re)selection of resources, they perform resource selection in the selection window according to the perception result of the perception window. When a user performs data transmission in a certain time slot of the sensing window, since it cannot receive the secondary link control channel and the data channel sent by other users in the time slot, the resource reservation information of other users cannot be obtained.

Based on the solution of this embodiment, if the user receives the control information of other users in other time slots and decodes it successfully, and the time domain of the resource indication information contained in the control information is the above-mentioned time slot in which half-duplex occurs. Then, the resource reservation of the half-duplex time slot is judged by using the indication information contained in other time slots, and the resource reservation information is used to perform resource selection in the selection window.

In specific implementation, the resource selection method for the auxiliary link provided in the following steps S101 to S102 may be executed by a chip with a resource selection function in the user equipment, or may be executed by a baseband chip in the user equipment.

More specifically, referring to FIG. 3, the resource selection method for the secondary link described in this embodiment may include the following steps:

Step S101: Determine the resource reservation information of the half-duplex time slot according to the control information received in other time slots of the sensing window, where the other time slots refer to time slots other than the half-duplex time slot in the sensing window , The half-duplex time slot refers to a time slot for performing auxiliary link data transmission within the sensing window;

Step S102, excluding the reserved resources in the selection window at least according to the resource reservation information of the half-duplex time slot to obtain candidate resources.

To facilitate distinction, in this embodiment, users who execute the solutions of this embodiment are referred to as executing users, and users other than the executing users are referred to as other users. Furthermore, in the perception window, the execution user receives and decodes the control information sent by all other users to determine the resources reserved by other users. Since the executing user performs the secondary link data transmission in the half-duplex time slot, and therefore cannot receive the control information of other users in the half-duplex time slot, the executing user adopts the solution of this embodiment to base on the control information of other time slots. Estimate the resource reservation information of the half-duplex time slot.

Further, the other users all support periodic resource reservation and multiple transmission resource reservation. Correspondingly, the control information sent by other users using any resource may include the association relationship between the other resources reserved by the other users and the current resources. By executing the solution of this embodiment, the executing user determines the time-frequency domain position of the resources used by other users in the half-duplex time slot based on this association relationship, and then determines the resource reservation information of the half-duplex time slot.

For example, referring to FIG. 4, the step S101 may include the following steps:

Step S1011: Determine, according to the control information, the time-frequency domain position and the reserved period of the resources used in the half-duplex time slot;

Step S1012: Determine the corresponding resource after one or more reservation periods of the used resource according to the time-frequency domain position of the used resource and the reservation period, so as to obtain the resource reservation of the half-duplex time slot information.

In a specific implementation, there may be multiple other users sending control information in the sensing window, and each of the other users may use multiple resources to send control information. Since multiple control information of the same other user may all indicate the reserved resource information of the half-duplex time slot, the step S1011 may include the step of: for the same other user, according to the information sent by the other user in the other time slot At least one of the control information determines the time-frequency domain position of the resources used by the other user in the half-duplex time slot and the reserved period, where the other user refers to sending control information in other time slots of the perception window User.

In a specific implementation, the control information may include: a time interval field, which is used to indicate the time interval between other resources used by other users who send the control information and the resource for transmitting the control information.

The control information may include a frequency domain information indication field, which is used to indicate the frequency domain start position of other resources used by other users who send the control information and the number of subchannels included.

The control information may include a reservation period, which is used to indicate that the corresponding resource after the reservation period has passed for the resource for transmitting the control information is also reserved by other users that send the control information. Furthermore, all resources used by the same other user can share the same reservation period.

Correspondingly, the step S1011 may include the steps of: determining that the half-duplex time slot has a resource to be used according to the time interval field; determining the frequency domain position of the used resource according to the frequency domain information indication field; The reservation period in the control information is determined as the reservation period of the used resource.

In a specific implementation, the other users may not support resource backward indication. The resource backward indication refers to that the control information transmitted by the later resource in the time domain can indicate the time-frequency domain location information of the previous resource of the same other user.

Correspondingly, the step S1011 may include the step of determining the time-frequency domain position of the resource used in the half-duplex time slot according to the control information of the other time slots that are earlier than the half-duplex time slot in the other time slots, and Reserve cycles. At this time, only the control information of resource transmission earlier than the half-duplex time slot in the time domain can indicate the resource reservation information of the half-duplex time slot.

In a variation, when the backward indication of resources is supported, the step S1011 may include the step of: determining the time when the resource is used in the half-duplex time slot according to any control information in the control information of the other time slots. Frequency domain position and reserved period. At this time, the control information for resource transmission later than the half-duplex time slot in the time domain can also indicate the resource reservation information of the half-duplex time slot.

In a specific implementation, the step S102 may include the step of excluding the reserved resources indicated by the resource reservation information of the half-duplex time slot within the selection window, and determining the remaining resources as the candidate resources . As a result, the resources used in the half-duplex time slot are directly excluded from the corresponding resources after the reserved period in the selection window, so as to avoid transmission collisions with other users.

In a variation, referring to FIG. 5, the step S102 may include the following steps:

Step S1021: Compare the signal strength measured on the resource carrying the control information in the sensing window with a reference signal strength threshold;

Step S1022: When the comparison result indicates that the signal strength is lower than the reference signal strength threshold, the reserved resource indicated by the resource reservation information of the half-duplex time slot is determined as one of the candidate resources.

Specifically, the reference signal strength threshold may be determined according to network configuration or pre-configuration. For example, it can be calculated according to the network configuration or a pre-configured calculation formula.

That is, in this variation, the corresponding resource after the reserved period of the resource used by the half-duplex time slot is not directly excluded, but the signal strength measured on the resource transmitting the control information in the sensing window is compared with the total value. The reference signal strength threshold is compared. If the measured signal strength is lower than the reference signal strength threshold, it can be considered that although the reserved resource is reserved for other users, because in fact the transmission signal of other users on the resource is very weak, it can be considered that even The executing UE also uses the reserved resources for data transmission, and the interference with other users is also small and acceptable. Therefore, when the signal strength is lower than the reference signal strength threshold, the reserved resources may not be excluded.

For example, the signal strength may be characterized based on the reference signal receiving power (Reference Signal Receiving Power, RSRP) of a PSSCH demodulation reference signal (Demodulation Reference Signal, DMRS) measured on the resource.

Further, in the step S1022, the reserved resource may be determined as one of the Z% available candidate resources.

In a specific implementation, within the sensing window, there may be multiple other users who have sent control information in the other time slots, and each of the other users may have sent one or more control information in the other time slots. .

Correspondingly, the step S1021 may include the step of: for each other user, select the resource used by the at least one control information sent by the other user in the other time slot, measure the signal strength, and compare it with the reference signal The intensity threshold is compared.

For example, for each other user, select any one of the multiple control information sent by the other user in the other time slot, and measure the signal strength of the resource that carries the control information and compare it with the reference signal strength threshold Compare.

For another example, for each other user, select any one of the multiple control information sent by the other user in the other time slot, measure the signal strength of the resource carrying these control information, and average the measured The value is compared with the reference signal strength threshold.

In view of the above, by adopting the solution of this embodiment, it is possible to reserve as many candidate resources as possible in the selection window while accurately excluding reserved resources. Specifically, when the secondary link transmission is performed in certain time slots (that is, the half-duplex time slot) within the sensing window, and the secondary link transmissions sent by other users cannot be received, the resources reserved by other users cannot be obtained. In the case of information, the solution of this embodiment uses the relevant indications in the auxiliary link transmission information received on other time slots within the sensing window to determine the resource reservation of the half-duplex time slot.

Therefore, although it is not possible to receive information about resource reservation by other users in the half-duplex time slot, it can still be used according to the relevant instructions for periodic resource reservation and multi-transmission resource reservation in the control information received in other time slots. The resource reservation of the half-duplex time slot can be reasonably deduced. Therefore, it can be ensured that the reserved resources of other users will not be missed when the reserved resources are excluded from the selection window.

Further, compared with the resource selection solution used in the prior art that excludes all possible reserved periods, the solution of this embodiment can accurately determine the reserved resources of other users. Therefore, the user who executes the solution of this embodiment does not need to make all possible reservations. All resources in the reserved period are eliminated, making it possible to reserve as many candidate resources as possible in the selection window for data transmission on the auxiliary link.

In a typical application scenario, referring to Figure 6, both user 1 and user 2 support periodic resource reservation and multiple transmission resource reservation.

User 1 first performs secondary link data transmission on resource 1, and sends secondary link control channels and data channels, where the secondary link control channel carries secondary link control information (referred to as control information). The control information sent by user 1 in resource 1 contains a time interval field, which is used to indicate the time interval between resource 2 and resource 1, and the time interval between resource 3 and resource 2. The control information sent by user 1 in resource 1 also includes a frequency domain information indication field, which is used to indicate the respective frequency domain starting positions of resource 2 and resource 3 and the number of sub-channels included. The control information sent by user 1 on resource 1 also includes a reservation period, which is used to indicate that the corresponding resources of resource 1, resource 2 and resource 3 after the reservation period P1 in the time domain are also reserved by user 1.

User 1 then performs secondary link transmission on resource 2 and also sends control information. The control information sent by user 1 on resource 2 includes a time interval field, which is used to indicate the time interval between resource 3 and resource 2. The control information sent by user 1 in resource 2 also includes a frequency domain information indication field, which is used to indicate the frequency domain starting position of resource 3 and the number of subchannels included. The control information sent by user 1 on resource 2 also includes a reservation period, which is used to indicate that the corresponding resources of resource 2 and resource 3 after the reservation period P1 in the time domain are also reserved by user 1.

User 1 then performs secondary link transmission on resource 3, and the control information it sends on resource 3 includes the reserved period field (that is, the reserved period), which is used to indicate that resource 3 has passed the reserved period P1 in the time domain. The subsequent corresponding resources are also reserved by user 1.

User 2 first performs secondary link data transmission on resource 4, and sends secondary link control channels and data channels, where the secondary link control channel carries secondary link control information (referred to as control information). The control information sent by user 2 on resource 4 includes a time interval field, which is used to indicate the time interval between resource 5 and resource 4. The control information sent by user 2 on resource 4 also includes a frequency domain information indication field, which is used to indicate the frequency domain starting position of resource 5 and the number of subchannels included. The control information sent by the user 2 on the resource 4 also includes a reservation period, which is used to indicate that the corresponding resources of the resource 4 and the resource 5 after the reservation period P2 in the time domain are also reserved by the user 2.

User 2 then performs secondary link transmission on resource 5. The control information it sends on resource 5 includes the reserved period field (that is, the reserved period), which is used to indicate that resource 5 has passed the reserved period P2 in the time domain. The corresponding resource of is also reserved by user 2.

User 3 performs (re)selection of resources in time slot n, and excludes resources that have been reserved in the selection window according to the sensing result in the sensing window. Because user 3 performs secondary link data transmission in time slot n-k1 in the sensing window, user 3 cannot receive the control information sent by user 1 on resource 3 and the control information sent by user 2 on resource 5.

In this scenario, based on the solution of this embodiment, if user 3 successfully decodes at least one of the control information sent by user 1 on resource 1 and resource 2, the time-frequency domain position of resource 3 can be determined according to the indication of the control information And the reservation period, so as to determine the reservation of resource 3. Further, when the user 3 selects a resource in the selection window, the corresponding resource after the resource 3 has passed the reservation period P1 is directly excluded.

Similarly, if the user 3 successfully decodes the control information sent by the user 2 on the resource 4, the time-frequency domain position and the reservation period of the resource 5 can be determined according to the instructions of the control information, so as to determine the reservation of the resource 5. When the user 3 selects resources in the selection window, the corresponding resources of the resource 5 after the reservation period P2 are directly excluded.

In a variation of this scenario, user 3 may not directly exclude the corresponding resources of resource 3 after the reserved period P1, but compare the RSRP of PSSCH and DMRS measured on resource 1 or resource 2 in the sensing window with the reference signal strength Threshold. When the measured RSRP is lower than the reference signal strength threshold, the corresponding resource can be used as a Z% candidate resource; when the measured RSRP is higher than the reference signal strength threshold, the corresponding resource is excluded.

Similarly, the user 3 may not directly exclude the corresponding resources of the resource 5 after the reserved period P2, but compare the RSRP of the PSSCH DMRS measured on the resource 4 in the sensing window with the reference signal strength threshold. When the measured RSRP is lower than the reference signal strength threshold, the corresponding resource can be used as a Z% candidate resource; when the measured RSRP is higher than the reference signal strength threshold, the corresponding resource is excluded.

In another typical application scenario, referring to FIG. 7, both user 1 and user 2 support periodic resource reservation and multiple transmission resource reservation, and also support resource backward indication.

User 1 performs auxiliary link transmission on resource 1. The control information sent by user 1 in resource 1 includes a time interval field, which is used to indicate the time interval between resource 2 and resource 1, and the time interval between resource 3 and resource 2. The control information sent by user 1 in resource 1 also includes a frequency domain information indication field, which is used to indicate the respective frequency domain starting positions of resource 2 and resource 3 and the number of sub-channels included. The control information sent by user 1 on resource 1 also includes a reservation period, which is used to indicate that the corresponding resources of resource 1, resource 2 and resource 3 after the reservation period P1 in the time domain are also reserved by user 1.

When user 1 performs secondary link transmission on resource 2, the control information sent includes a time interval field, which is used to indicate the time interval between resource 1 and resource 2, and the time interval between resource 3 and resource 2. The control information sent by user 1 in resource 2 also includes a frequency domain information indication field, which is used to indicate the respective frequency domain starting positions of resource 1 and resource 3 and the number of sub-channels included. The control information sent by the user 1 on the resource 2 also includes a reservation period, which is used to indicate that the corresponding resources of the resource 1, the resource 2 and the resource 3 after the reservation period P1 in the time domain are also reserved by the user 1.

When user 1 performs secondary link data transmission on resource 3, the control information sent includes a time interval field, which is used to indicate the time interval between resource 1 and resource 3, and the time interval between resource 2 and resource 3. The control information sent by user 1 in resource 3 also includes a frequency domain information indication field, which is used to indicate the respective frequency domain starting positions of resource 1 and resource 2 and the number of sub-channels included. The control information sent by the user 1 on the resource 3 also includes a reservation period, which is used to indicate that the corresponding resources of the resource 1, the resource 2 and the resource 3 after the reservation period P1 in the time domain are also reserved by the user 1.

When user 2 performs secondary link transmission on resource 4, the control information sent includes a time interval field, which is used to indicate the time interval between resource 5 and resource 4. The control information sent by user 2 on resource 4 also includes a frequency domain information indication field, which is used to indicate the frequency domain starting position of resource 5 and the number of subchannels included. The control information sent by the user 2 on the resource 4 also includes a reservation period, which is used to indicate that the corresponding resources of the resource 4 and the resource 5 after the reservation period P2 in the time domain are also reserved by the user 2.

The control information sent by user 2 when performing secondary link transmission on resource 5 includes a time interval field, which is used to indicate the time interval between resource 4 and resource 5. The control information sent by user 2 on resource 5 also includes a frequency domain information indication field, which is used to indicate the frequency domain starting position of resource 4 and the number of subchannels included. The control information sent by the user 2 on the resource 5 also includes a reservation period, which is used to indicate that the corresponding resources of the resource 4 and the resource 5 after the reservation period P2 in the time domain are also reserved by the user 2.

User 3 performs (re)selection of resources in time slot n, and excludes resources that have been reserved in the selection window according to the sensing result in the sensing window. Because user 3 performs secondary link data transmission in time slot n-k2 in the sensing window, user 3 cannot receive the control information sent by user 1 on resource 1 and the control information sent by user 2 on resource 4.

In this scenario, based on the solution of this embodiment, if user 3 successfully decodes at least one of the control information sent by user 1 on resource 2 and resource 3, the time-frequency domain position of resource 1 can be determined according to the instructions of the control information And the reservation period, so as to determine the reservation of resource 1. Further, when the user 3 selects resources in the selection window, the corresponding resources of the resource 1 after the reservation period P1 are directly excluded.

Similarly, if the user 3 successfully decodes the control information sent by the user 2 on the resource 5, the time-frequency domain position and the reservation period of the resource 4 can be determined according to the indication of the control information, so as to determine the reservation of the resource 4. Further, when the user 3 selects resources in the selection window, the corresponding resources of the resource 4 after the reservation period P2 are directly excluded.

In a variation of this scenario, user 3 may not directly exclude the corresponding resources of resource 1 after the reserved period P1, but compare the RSRP of PSSCH and DMRS measured on resource 2 or resource 3 in the sensing window with the reference signal strength Threshold. When the measured RSRP is lower than the reference signal strength threshold, the corresponding resource can be used as a Z% candidate resource; when the measured RSRP is higher than the reference signal strength threshold, the corresponding resource is excluded.

Similarly, the user 3 may not directly exclude the corresponding resources of the resource 4 after the reserved period P2, but compare the RSRP of the PSSCH DMRS measured on the resource 5 in the sensing window with the reference signal strength threshold. When the measured RSRP is lower than the reference signal strength threshold, the corresponding resource can be used as a Z% candidate resource; when the actually measured RSRP is higher than the reference signal strength threshold, the corresponding resource is excluded.

In a specific implementation, referring to FIG. 8, the step S102 may include the following steps:

Step S1028: In the frequency domain, the part except the frequency domain position of the reserved resource indicated by the resource reservation information of the half-duplex time slot is recorded as the first frequency domain part;

Step S1029: For the first frequency domain part, all candidate reserved time slots in the selection window corresponding to the resources of the first frequency domain part are excluded to obtain the candidate resources.

Therefore, for the indeterminate resource occupation part, resources are excluded for all possible cycles in the subsequent resource selection process. Wherein, the indeterminable resource occupation part may refer to the frequency domain part where the relevant indication information is not found in other time slots of the sensing window. Compared with the prior art method of excluding all frequency bands of all possible reserved periods, the solution of this embodiment only excludes undeterminable frequency bands from all possible reserved periods, so as to reasonably reserve more candidate resources.

Specifically, all candidate reserved time slots in the selection window may refer to time slots that fall into the selection window in a time slot group obtained by the half-duplex time slot after a preset reserved period set.

For example, in the scenario shown in FIG. 6, the frequency domain part (that is, the first frequency domain part) other than the frequency domain positions occupied by resource 3 and resource 5 on time slot n-k1 is not in the sensing window. Find the relevant indication information in other time slots within to indicate the resource demand situation of the first frequency domain part. Therefore, in this scenario, based on the embodiment scheme shown in FIG. 8, a set of time slots can be obtained by adding the reserved period set supported by NR (ie, the preset reserved period set) to the time slot n-k1. The above-mentioned frequency domain parts corresponding to the time slots of the group of time slots falling into the selection window are directly excluded.

For another example, in the scenario shown in FIG. 7, other frequency domain parts (that is, the first frequency domain part) except for the frequency domain positions occupied by resource 1 and resource 4 on time slot n-k2 are not being sensed. Relevant indication information is found in other time slots in the window to indicate the resource demand situation of the first frequency domain part. Therefore, in this scenario, based on the embodiment scheme shown in FIG. 8, a set of time slots can be obtained by adding the reserved period set supported by NR (ie, the preset reserved period set) to the time slot n-k2. The above-mentioned frequency domain parts corresponding to the time slots of the group of time slots falling into the selection window are directly excluded.

In a typical application scenario, referring to Figure 9, it is assumed that based on the solution of this embodiment, it has been determined that there are other user transmission resources in the frequency domain position 1 of the half-duplex time slot a, and there are other user transmission resources in the frequency domain position 2 of the half-duplex time slot. b, and there are other user transmission resources c in the frequency domain position 3 of the half-duplex time slot. For ease of presentation, the frequency domain position described in this embodiment may be up to a continuous frequency domain range.

It is assumed that according to the control information received in the other gaps, the corresponding resources of the resource a after the reservation period pa are reserved by other users. The corresponding resources of the resource b after the reservation period pb are reserved by other users. The corresponding resource of the resource c after the reservation period pc is reserved by other users.

Except for the aforementioned frequency domain position 1, frequency domain position 2, and frequency domain position 3, the frequency domain position 4 and frequency domain position 5 of the half-duplex time slot cannot be confirmed whether they are occupied by other users.

Therefore, after the candidate reserved time slots in the window are selected according to the preset reserved period set, the frequency domain positions 4 (marked with slashes in the figure) corresponding to all candidate reserved time slots are determined to be excluded resource.

Similarly, the frequency domain positions 5 (marked with grid lines in the figure) corresponding to all candidate reserved time slots are determined as resources to be excluded.

Comparing Fig. 9 and Fig. 2 it can be found that with the scheme of this embodiment, for candidate reserved time slots, all frequency bands of these time slots are no longer excluded (as shown in Fig. 2), but only those in Fig. 9 are excluded. The part of the resource that has a pattern fill. As a result, more resources are reserved as candidate resources, and the execution user has a larger choice.

In a specific implementation, after the step S102, the resource selection method of this embodiment may further include the step of selecting a resource from the candidate resources as the transmission resource according to the size of the data packet to be transmitted.

For example, Z% of the available candidate resources of the total number of candidate resources may be reported to the higher layer, and the higher layer randomly selects the transmission resource.

FIG. 10 is a schematic structural diagram of a resource selection device for a secondary link according to an embodiment of the present invention. Those skilled in the art understand that the resource selection device 9 for the secondary link (hereinafter referred to as the resource selection device 9) described in this embodiment can be used to implement the method and technology described in the embodiments described in FIGS. 3 to 9 above. plan.

Specifically, referring to FIG. 10, the resource selection device 9 of this embodiment may include: a determining module 91, configured to determine the resource reservation information of the half-duplex time slot according to the control information received in other time slots of the sensing window, where , The other time slots refer to time slots other than the half-duplex time slot in the sensing window, and the half-duplex time slot refers to the time slot for auxiliary link data transmission in the sensing window; the exclusion module 92, It is used to exclude the reserved resources in the selection window at least according to the resource reservation information of the half-duplex time slot to obtain candidate resources.

For more details about the working principle and working mode of the resource selection device 9, reference may be made to the related descriptions in FIGS. 3 to 9 above, which will not be repeated here.

In a specific implementation, the above-mentioned resource selection device may correspond to a chip with a resource selection function in a user equipment, or a chip with a data processing function, such as System-On-a-Chip (SOC for short), baseband Chips, etc.; or corresponding to a chip module with a resource selection function chip included in the user equipment; or corresponding to a chip module with a data processing function chip, or corresponding to a user equipment.

In specific implementation, with regard to the various modules/units contained in the various devices and products described in the above embodiments, they may be software modules/units, hardware modules/units, or part software modules/units, and partly software modules/units. It is a hardware module/unit.

For example, for various devices and products that are applied to or integrated in a chip, the various modules/units contained therein can be implemented in the form of hardware such as circuits, or at least part of the modules/units can be implemented in the form of software programs. Runs on the integrated processor inside the chip, and the remaining (if any) part of the modules/units can be implemented by hardware methods such as circuits; for each device and product applied to or integrated in the chip module, the modules/units contained therein can be All are implemented by hardware such as circuits. Different modules/units can be located in the same component (such as a chip, circuit module, etc.) or different components of the chip module, or at least part of the modules/units can be implemented by software programs. The software program runs on the processor integrated inside the chip module, and the remaining (if any) part of the modules/units can be implemented by hardware methods such as circuits; for each device and product applied to or integrated in the terminal, the modules contained therein The modules/units can all be implemented by hardware such as circuits, and different modules/units can be located in the same component (for example, chip, circuit module, etc.) or different components in the terminal, or at least part of the modules/units can be implemented in the form of software programs Implementation, the software program runs on the processor integrated inside the terminal, and the remaining (if any) part of the modules/units can be implemented by hardware such as circuits.

Further, the embodiment of the present invention also discloses a storage medium on which computer instructions are stored, and when the computer instructions are run, the method and technical solutions described in the embodiments shown in FIGS. 3 to 9 are executed. Preferably, the storage medium may include a computer-readable storage medium such as a non-volatile memory or a non-transitory memory. The storage medium may include ROM, RAM, magnetic disk or optical disk, etc.

Further, the embodiment of the present invention also discloses a terminal, which includes the resource selection device 9 for a secondary link described in FIG. 10 above. Alternatively, the terminal may include a memory and a processor, the memory stores computer instructions that can run on the processor, and the processor executes the implementation shown in FIGS. 3 to 9 when the computer instructions are executed. The method and technical scheme described in the example. Preferably, the terminal may be an NR V2X user.

Although the present invention is disclosed as above, the present invention is not limited to this. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined by the claims.

Claims

A method for selecting resources for auxiliary links, which is characterized in that it includes:

Determine the resource reservation information of the half-duplex time slot according to the control information received in other time slots of the sensing window, where the other time slots refer to time slots other than the half-duplex time slot in the sensing window, and A half-duplex time slot refers to a time slot for auxiliary link data transmission within the sensing window;

At least according to the resource reservation information of the half-duplex time slot, the reserved resources in the selection window are excluded to obtain candidate resources.
The resource selection method according to claim 1, wherein the determining the resource reservation information of the half-duplex time slot according to the control information received in other time slots of the sensing window comprises:

Determining, according to the control information, the time-frequency domain position and the reserved period of the resources used in the half-duplex time slot;

The corresponding resource of the used resource after one or more reservation periods is determined according to the time-frequency domain position of the used resource and the reservation period, so as to obtain the resource reservation information of the half-duplex time slot.
The method for resource selection according to claim 2, wherein the determining, according to the control information, the time-frequency domain position and the reserved period of the resources used in the half-duplex time slot comprises:

For the same other user, determine the time-frequency domain position and the reserved period of the resource used by the other user in the half-duplex time slot according to at least one of the control information sent by the other user in the other time slot, wherein the Other users refer to users who send control information in other time slots of the sensing window.
The method for resource selection according to claim 2, wherein the control information includes: a time interval domain, a frequency domain information indication domain, and the reserved period; The time-frequency domain position of the resources used by the slot and the reserved period include:

Determining, according to the time interval field, that the half-duplex time slot has resources to be used;

Determining the frequency domain position of the used resource according to the frequency domain information indication domain;

The reservation period in the control information is determined as the reservation period of the used resource.
The method for resource selection according to claim 2, wherein the determining, according to the control information, the time-frequency domain position and the reserved period of the resources used in the half-duplex time slot comprises:

When the resource backward indication is supported, determine the time-frequency domain position and the reserved period of the resource used in the half-duplex time slot according to any control information in the control information of the other time slots;

When the resource backward indication is not supported, according to the control information of other time slots in the other time slots earlier than the half-duplex time slot, the time-frequency domain position and reservation of the resources used in the half-duplex time slot are determined cycle.
The resource selection method according to claim 1, wherein the excluding reserved resources in a selection window at least according to the resource reservation information of the half-duplex time slot to obtain candidate resources comprises:

In the selection window, the reserved resources indicated by the resource reservation information of the half-duplex time slot are excluded, and the remaining resources are determined as the candidate resources.
The resource selection method according to claim 1, wherein the excluding reserved resources in a selection window at least according to the resource reservation information of the half-duplex time slot to obtain candidate resources comprises:

Comparing the signal strength measured on the resource carrying the control information in the sensing window with a reference signal strength threshold;

When the comparison result shows that the signal strength is lower than the reference signal strength threshold, the reserved resource indicated by the resource reservation information of the half-duplex time slot is determined as one of the candidate resources.
The resource selection method according to claim 7, wherein the reference signal strength threshold is determined according to network configuration or pre-configuration.
The resource selection method according to claim 7, wherein multiple other users within the sensing window send the control information in the other time slots, and the comparison carries the control information in the sensing window The signal strength measured on the information resource and the reference signal strength threshold include:

For each other user, a resource used by at least one control information sent by the other user in the other time slot is selected to measure the signal strength, and compared with the reference signal strength threshold.
The resource selection method according to any one of claims 1 to 9, wherein the excluding reserved resources in a selection window at least according to the resource reservation information of the half-duplex time slot to obtain candidate resources comprises:

In the frequency domain, a part other than the frequency domain position of the reserved resource indicated by the resource reservation information of the half-duplex time slot is recorded as the first frequency domain part;

For the first frequency domain part, resources of all candidate reserved time slots in the selection window corresponding to the first frequency domain part are excluded to obtain the candidate resources.
The method for resource selection according to claim 10, wherein all candidate reserved time slots in the selection window refer to: the half-duplex time slots fall into all the time slot groups obtained by the preset reserved period set. Describe the time slot of the selection window.
The resource selection method according to claim 1, further comprising:

According to the size of the data packet to be transmitted, a resource is selected from the candidate resources as the transmission resource.
A resource selection device for auxiliary link, which is characterized in that it comprises:

The determining module is used to determine the resource reservation information of the half-duplex time slot according to the control information received in other time slots of the sensing window, where the other time slots refer to the other time slots in the sensing window except for the half-duplex time slot Time slot, the half-duplex time slot refers to a time slot for auxiliary link data transmission within the sensing window;

The exclusion module is configured to exclude the reserved resources in the selection window at least according to the resource reservation information of the half-duplex time slot to obtain candidate resources.
A storage medium having computer instructions stored thereon, wherein the computer instructions execute the steps of the method according to any one of claims 1 to 12 when the computer instructions are executed by a processor.
A terminal, comprising the resource selection device for the auxiliary link according to claim 13, or comprising a memory and a processor, and the memory stores computer instructions that can run on the processor, and is characterized in That is, when the processor executes the computer instructions, the steps of the method according to any one of claims 1 to 12 are executed.