Direct communication resource selection method and device

Abstract

The present disclosure proposes a method and device for selecting direct communication resources, which relate to the field of communications. The technical solution of the present application is mainly that, in a resource selection process triggered by periodic direct transmission, when a transmitting user equipment's transmitting resource pool supports periodic resource reservation and the user equipment is configured to perform resource selection based on partial monitoring and the time-frequency resources to be selected do not meet the conditions required by the first resource selection mode, resource selection is performed according to a second resource selection mode, wherein the first resource selection mode is used to select resources for direct transmission with periodic resource reservation, and the second resource selection mode is used to select resources for direct transmission without periodic resource reservation. In the resource selection process based on partial monitoring triggered by periodic direct transmission, the UE can perform resource selection according to the resource selection mode used to select resources for direct transmission without periodic resource reservation, thereby improving data transmission performance.

Description

Technical Field

[0001] The present disclosure relates to the field of mobile communication technology, and in particular to a method and device for selecting direct communication resources. Background Art

[0002] In sidelink (SL) communications, user equipment (UE) is supported to use resource reservation and channel-monitoring-based resource selection. Because constant channel monitoring by UEs consumes a significant amount of power, the concept of "partial monitoring" has been introduced to achieve power savings.

[0003] In LTE (Long Term Evolution) V2X (Vehicle to Everything), only periodic resource reservation is supported. Therefore, when a UE is configured to perform resource selection based on partial monitoring but cannot provide sufficient channel monitoring results to meet the partial monitoring conditions, the UE will not be able to perform resource selection based on partial monitoring and can only perform random resource selection, which has inferior performance to resource selection based on partial monitoring.

[0004] However, in NR (New Radio) V2X, periodic resource reservation and aperiodic resource reservation are supported. In this case, it is no longer appropriate to still adopt a resource selection scheme similar to that in LTE V2X. Summary of the Invention

[0005] The present disclosure proposes a direct communication resource selection method and apparatus, which enables a user equipment (UE) to perform resource selection according to a resource selection mode for selecting resources for direct transmission without periodic resource reservation during a partial monitoring-based resource selection process triggered by periodic direct transmission, thereby improving data transmission performance.

[0006] An embodiment of the first aspect of the present disclosure provides a direct communication resource selection method, which is executed by a transmitting UE. The method includes: in a resource selection process triggered by periodic direct transmission, when the UE's sending resource pool supports periodic resource reservation and the UE is configured to perform resource selection based on partial monitoring and the time-frequency resources to be selected do not meet the conditions required by the first resource selection mode, performing resource selection according to a second resource selection mode; wherein the first resource selection mode is used to select resources for direct transmission that performs periodic resource reservation, and the second resource selection mode is used to select resources for direct transmission that does not perform periodic resource reservation.

[0007] Optionally, when the resource selection process is triggered, the media access control MAC layer or a higher layer indicates that the resource reservation period is not 0, and the higher layer includes the RLC layer, the PDCP layer, the RRC layer and / or the application layer, wherein the resource reservation period indicates the time interval between the resources required to be reserved when the UE performs periodic resource reservation.

[0008] Optionally, the conditions required for the first resource selection mode include: the number of candidate time-frequency resources that meet the first monitoring condition in the time-frequency resources to be selected exceeds a first threshold; wherein, the first monitoring condition includes: the UE monitors on a first monitoring resource set; wherein the first monitoring resource set is determined based on a specific resource reservation period set and the time-frequency position of the candidate time-frequency resources.

[0009] Optionally, the execution of non-periodic resource selection includes: selecting candidate time-frequency resources that meet a second monitoring condition and are not less than a second threshold from the time-frequency resources to be selected; wherein, the second monitoring condition includes: the UE monitors on a second monitoring resource set; wherein the second monitoring resource set is determined based on a specific resource reservation period set and the time-frequency position of the candidate time-frequency resources; or is determined only based on the time-frequency position of the candidate time-frequency resources.

[0010] Optionally, the performing of non-periodic resource selection includes: performing random resource selection among the time-frequency resources to be selected.

[0011] Optionally, the method further includes instructing the MAC layer or a higher layer through the physical layer to perform resource selection according to a second resource selection mode during the resource selection process, and the higher layer includes the RLC layer, the PDCP layer, the RRC layer and / or the application layer.

[0012] An embodiment of the second aspect of the present disclosure provides a direct communication resource selection device, including: a processing module, for performing resource selection according to a second resource selection mode in a resource selection process triggered by periodic direct transmission, when the UE's sending resource pool supports periodic resource reservation and the UE is configured to perform resource selection based on partial monitoring and the time-frequency resources to be selected do not meet the conditions required by the first resource selection mode; wherein the first resource selection mode is used to select resources for direct transmission with periodic resource reservation, and the second resource selection mode is used to select resources for direct transmission without periodic resource reservation.

[0013] Optionally, when the resource selection process is triggered, the media access control MAC layer or a higher layer indicates that the resource reservation period is not 0, and the higher layer includes the RLC layer, the PDCP layer, the RRC layer and / or the application layer, wherein the resource reservation period indicates the time interval between the resources required to be reserved when the UE performs periodic resource reservation.

[0014] Optionally, the conditions required for the first resource selection mode include: the number of candidate time-frequency resources that meet the first monitoring condition in the time-frequency resources to be selected exceeds a first threshold; wherein, the first monitoring condition includes: the UE monitors on a first monitoring resource set; wherein the first monitoring resource set is determined based on a specific resource reservation period set and the time-frequency position of the candidate time-frequency resources.

[0015] Optionally, the processing module is used to: select candidate time-frequency resources that meet a second monitoring condition and are no less than a second threshold from the time-frequency resources to be selected; wherein, the second monitoring condition includes: the UE monitors on a second monitoring resource set; wherein the second monitoring resource set is determined based on a specific resource reservation period set and the time-frequency position of the candidate time-frequency resources; or is determined only based on the time-frequency position of the candidate time-frequency resources.

[0016] Optionally, the processing module is used to: perform random resource selection among the time-frequency resources to be selected.

[0017] Optionally, the device also includes: a transceiver module, used to indicate to the MAC layer or a higher layer through the physical layer that resource selection is performed according to the second resource selection mode during the resource selection process, and the higher layer includes the RLC layer, PDCP layer, RRC layer and / or application layer.

[0018] An embodiment of the third aspect of the present disclosure provides a communication device, including: a transceiver; a memory; and a processor, which is connected to the transceiver and the memory, respectively, and is configured to control the wireless signal reception and transmission of the transceiver by executing computer-executable instructions on the memory, and can implement the direct communication resource selection method of the above-mentioned first aspect embodiment.

[0019] A fourth embodiment of the present disclosure provides a computer storage medium, wherein the computer storage medium stores computer-executable instructions; after the computer-executable instructions are executed by a processor, the direct communication resource selection method of the first embodiment can be implemented.

[0020] The embodiments of the present disclosure provide a method and apparatus for selecting direct communication resources, in which, during a resource selection process triggered by periodic direct transmission, a transmitting user equipment performs resource selection according to a second resource selection mode when the transmitting resource pool of the user equipment supports periodic resource reservation and the user equipment is configured to perform resource selection based on partial monitoring and the time-frequency resources to be selected do not meet the conditions required by the first resource selection mode, wherein the first resource selection mode is used to select resources for direct transmission with periodic resource reservation, and the second resource selection mode is used to select resources for direct transmission without periodic resource reservation. In this way, if the UE cannot provide sufficient channel monitoring results during the resource selection process based on partial monitoring triggered by periodic direct transmission, it can perform resource selection according to the resource selection mode used to select resources for direct transmission without periodic resource reservation, thereby improving data transmission performance.

[0021] Additional aspects and advantages of the present disclosure will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present disclosure will become apparent and readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0023] Figure 1 is a schematic diagram of the architecture of a communication system according to an embodiment of the present disclosure;

[0024] Figure 2 Schematic diagram of a flow chart of a method for selecting direct communication resources according to an embodiment of the present disclosure;

[0025] Figure 3 Schematic diagram of a flow chart of a method for selecting direct communication resources according to an embodiment of the present disclosure;

[0026] Figure 4 Schematic diagram of a flow chart of a method for selecting direct communication resources according to an embodiment of the present disclosure;

[0027] Figure 5 is a block diagram of a direct communication resource selection device according to an embodiment of the present disclosure;

[0028] Figure 6 is a block diagram of a direct communication resource selection device according to an embodiment of the present disclosure;

[0029] Figure 7 A schematic structural diagram of a communication device provided in an embodiment of the present disclosure;

[0030] Figure 8 A schematic diagram of the structure of a chip provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0031] The following describes in detail embodiments of the present disclosure, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present disclosure, and should not be construed as limiting the present disclosure.

[0032] In order to better understand the direct communication resource selection method and apparatus disclosed in the embodiments of the present application, the communication system to which the embodiments of the present application are applicable is first described below.

[0033] See Figure 1 In a scenario where directly connected communication devices communicate directly with each other, the network device configures various transmission parameters for directly connected communication device 1. Directly connected communication device 1 acts as the data transmitter, and directly connected communication device 2 acts as the data receiver, communicating directly with each other. The links between the network device and the directly connected communication device are called uplinks and downlinks, while the links between directly connected communication devices are called sidelinks.

[0034] It is understandable that Figure 1 The wireless communication system shown is only for schematic illustration. The wireless communication system may also include other network devices, such as core network devices, wireless relay devices, and wireless backhaul devices. Figure 1 The embodiment of the present disclosure does not limit the number of network devices and terminals included in the wireless communication system.

[0035] It can be further understood that the wireless communication system of the embodiment of the present disclosure is a network that provides wireless communication functions. The wireless communication system can adopt different communication technologies, such as code division multiple access (CDMA), wideband code division multiple access (WCDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency-division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), carrier sense multiple access / collision avoidance (Carrier Sense Multiple Access with Collision Avoidance). According to factors such as the capacity, rate, and latency of different networks, the network can be divided into 2G (English: generation) network, 3G network, 4G network or future evolution network, such as 5G network, which can also be called New Radio (NR). For the convenience of description, the present disclosure sometimes refers to the wireless communication network as simply a network.

[0036] Furthermore, the network devices involved in the present disclosure may also be referred to as wireless access network devices. The wireless access network devices may be: base stations, evolved node Bs (eNBs), home base stations, access points (APs) in wireless fidelity (WIFI) systems, wireless relay nodes, wireless backhaul nodes, transmission points (TPs) or transmission and reception points (TRPs), etc. They may also be gNBs in NR systems, or they may be components or a portion of a base station. In the case of a vehicle-to-everything (V2X) communication system, the network device may also be an on-board device. It should be understood that in the embodiments of the present disclosure, the specific technology and specific device form used by the network device are not limited.

[0037] Furthermore, the terminal involved in the present disclosure may also be referred to as a terminal device, user equipment (UE), mobile station (MS), mobile terminal (MT), etc., which is a device that provides voice and / or data connectivity to users. For example, the terminal can be a handheld device with wireless connection function, a vehicle-mounted device, etc. At present, some examples of terminals are: smart phones (Mobile Phones), pocket personal computers (PPCs), handheld computers, personal digital assistants (PDAs), laptops, tablet computers, wearable devices, or vehicle-mounted devices, etc. In addition, when it is a vehicle-to-everything (V2X) communication system, the terminal device can also be a vehicle-mounted device. It should be understood that the embodiments of the present disclosure do not limit the specific technology and specific device form adopted by the terminal.

[0038] In the present disclosure, the communication scenario of direct communication between directly connected communication devices can also be a device-to-device (D2D) communication scenario. The directly connected communication devices for direct communication in the embodiments of the present disclosure may include various handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices, or other processing devices connected to a wireless modem, as well as various forms of user equipment (UE), mobile stations (MS), terminals, terminal equipment, etc. For the convenience of description, the embodiments of the present disclosure are described below using the directly connected communication device as an example of a terminal.

[0039] It can be understood that the communication system described in the embodiment of the present application is for the purpose of more clearly illustrating the technical solution of the embodiment of the present application, and does not constitute a limitation on the technical solution provided by the embodiment of the present application. Ordinary technicians in this field can know that with the evolution of the system architecture and the emergence of new business scenarios, the technical solution provided by the embodiment of the present application is also applicable to similar technical problems.

[0040] Vehicle-to-everything (V2X) is a key technology for future intelligent transportation systems. Research focuses on vehicle data transmission solutions based on the Third Generation Partnership Project (3GPP) communication protocol. V2X communication includes vehicle-to-vehicle (V2V) communication, vehicle-to-roadside equipment (V2I) communication, and vehicle-to-pedestrian (V2P) communication. V2X applications will improve driving safety, reduce congestion and vehicle energy consumption, and increase traffic efficiency. Leveraging existing cellular communication technologies to support V2X communication effectively utilizes existing base station deployments, reduces equipment overhead, and facilitates the provision of QoS-guaranteed services to meet the needs of V2X services. Therefore, LTE Releases 14 and 15 provide cellular network support for V2X communication, known as C-V2X (cellular-based V2X). In C-V2X, communication between onboard devices and other devices can be relayed through base stations and the core network, leveraging the existing cellular network communication links between user devices and base stations (UL / DL communication). Alternatively, communication can be conducted directly between devices (sidelink communication). Compared to UL / DL communication, sidelink communication offers shorter latency and lower overhead, making it ideal for direct communication between onboard devices and nearby devices.

[0041] With the development of 5G mobile communication technology, 3GPP Release 16 leverages 5G NR (New Radio) technology to support new V2X communication services and scenarios, such as vehicle platooning, extended sensor systems, advanced driving, and remote driving. Overall, 5G V2X sidelink offers higher communication rates, shorter latency, and more reliable communication quality.

[0042] In sidelink communications, UEs are supported to use resource reservation and channel-monitoring-based resource selection. Because constant channel monitoring by UEs consumes a significant amount of power, the concept of "partial monitoring" has been introduced to save power.

[0043] Resource selection based on partial monitoring can include the following situations:

[0044] Case 1: Partial monitoring-based resource selection triggered by periodic direct transmission in a Mode 2 resource pool that supports periodic resource reservation;

[0045] Case 2: Partial monitoring-based resource selection triggered by aperiodic direct transmission in a Mode 2 resource pool that supports periodic resource reservation.

[0046] Case 3: Partial monitoring-based resource selection triggered by aperiodic direct transmission is performed in a mode 2 resource pool that does not support periodic resource reservation.

[0047] When performing the aforementioned partial monitoring-based resource selection, specific partial monitoring conditions must be met. These conditions may vary depending on the scenario. Because the arrival of periodic data is relatively easy to predict, the partial monitoring conditions required in Cases 2 and 3 are generally more relaxed than those required in Case 1.

[0048] LTE (Long Term Evolution) V2X (Vehicle to Everything) only supports periodic resource reservation. Therefore, when a UE is configured to perform partial monitoring-based resource selection but cannot provide sufficient channel monitoring results to meet the partial monitoring conditions, the UE will not be able to perform partial monitoring-based resource selection and will have to perform random resource selection. Random resource selection can only avoid transmission collisions through randomization, and its performance is inferior to partial monitoring-based resource selection.

[0049] In NR (New Radio) V2X, both periodic and aperiodic resource reservation are supported. In this case, it is no longer appropriate to still adopt a resource selection scheme similar to that in LTE V2X.

[0050] To this end, for NR V2X communication, the present disclosure proposes a direct communication resource selection method and device, so that if the UE cannot provide sufficient channel monitoring results during the resource selection process based on partial monitoring triggered by periodic direct transmission, it can perform non-periodic resource selection based on partial monitoring, thereby improving data transmission performance.

[0051] The following is a detailed introduction to the direct communication resource selection method and device provided in this application with reference to the accompanying drawings.

[0052] Figure 2 FIG. 1 shows a flow chart of a method for selecting direct communication resources according to an embodiment of the present disclosure. Figure 2 As shown, the method can be executed by the transmitting end UE and includes the following steps.

[0053] S201, in the resource selection process triggered by periodic direct transmission, when the UE's sending resource pool supports periodic resource reservation and the UE is configured to perform resource selection based on partial monitoring and the time-frequency resources to be selected do not meet the conditions required by the first resource selection mode, resource selection is performed according to the second resource selection mode.

[0054] The first resource selection mode is used to select resources for direct transmission with periodic resource reservation, and the second resource selection mode is used to select resources for direct transmission without periodic resource reservation.

[0055] The UE may perform resource selection according to different resource selection modes, for example, it may perform resource selection according to the first resource selection mode, or it may perform resource selection according to the second resource selection mode. In the present application, the "first resource selection mode" is used to select resources for direct transmission with periodic resource reservation, that is, in direct transmission using resources selected according to the first resource selection mode, periodic resource reservation is performed. Hereinafter, for the sake of simplicity, "resource selection according to the first resource selection mode" may also be referred to as "periodic resource selection". The "second resource selection mode" is used to select resources for direct transmission without periodic resource reservation, that is, in direct transmission using resources selected according to the second resource selection mode, periodic resource reservation is not performed. Hereinafter, for the sake of simplicity, "resource selection according to the second resource selection mode" may also be referred to as "non-periodic resource selection".

[0056] In addition, in the present application, "time-frequency resources to be selected" may refer to the time-frequency resources in the resource selection window used by the UE when performing resource selection.

[0057] In the resource selection process triggered by periodic direct transmission, generally, when the UE's sending resource pool supports periodic resource reservation, the UE is expected to be triggered to perform periodic resource selection, but if the current UE is configured to perform resource selection based on partial monitoring, whether the UE can perform periodic resource selection depends on whether the time-frequency resource to be selected meets a specific partial monitoring condition, that is, if the time-frequency resource to be selected does not meet the specific partial monitoring condition, the UE cannot perform periodic resource selection. In this embodiment, in the resource selection process triggered by periodic direct transmission, when the UE's sending resource pool supports periodic resource reservation and the UE is configured to perform resource selection based on partial monitoring and the time-frequency resource to be selected does not meet the conditions required by the first resource selection mode (that is, the time-frequency resource to be selected cannot meet the specific partial monitoring condition that needs to be met for periodic resource selection), the UE performs non-periodic resource selection.

[0058] In some embodiments, when the resource selection process is triggered, a Media Access Control (MAC) layer or higher layer signaling indicates that the resource reservation period is greater than 0. The higher layer may be an RLC layer, a PDCP layer, an RRC layer, and / or an application layer.

[0059] When resource selection is triggered, the MAC layer or higher layers indicate resource selection parameters to the physical layer for resource selection. When the indicated resource reservation period is not zero, periodic resource selection is triggered, meaning the UE is expected to make periodic resource reservations with a period not equal to zero during direct transmission using the selected resources. Periodic resource reservation refers to the UE reserving time-frequency resources for the next period while performing direct transmission in the current period. For example, if the resource reservation period is Ts, when the UE performs direct transmission at time t, it will reserve transmission resources for time t+Ts. The value of the resource reservation period Ts is generally a finite set of values, such as 0, 100, 200, 300, 400, 500 milliseconds, etc. It should be understood that the unit of Ts can be a physical time unit such as milliseconds, seconds, time slots, subframes, or a logical time unit such as a logical time slot. For example, all time units that can be used for direct transmission are numbered in chronological order, referred to as direct logical time units, and the logical time difference between two moments is the number of logical time units between them.

[0060] In some embodiments, the conditions required for the first resource selection mode include: the number of candidate time-frequency resources that meet the first monitoring condition in the time-frequency resources to be selected exceeds a first threshold; wherein, the first monitoring condition includes: the UE monitors on a first monitoring resource set; wherein the first monitoring resource set is determined based on a specific resource reservation period set and the time-frequency position of the candidate time-frequency resources.

[0061] In the present application, "candidate time-frequency resources" may refer to time-frequency resources selected by the UE for direct connection transmission when performing resource selection.

[0062] If periodic resource selection based on partial monitoring is to be performed in the resource selection process triggered by periodic direct transmission, the UE needs to be able to select candidate time-frequency resources of no less than the first threshold from the time-frequency resources to be selected, and the candidate time-frequency domain resources meet the first monitoring condition, that is, the UE monitors on the first monitoring resource set, and the first monitoring resource set can be determined based on a specific resource reservation period set and the time-frequency position of the candidate time-frequency resources. Note that the resources in the first monitoring resource set may be before the resource selection is triggered, or may be after the resource selection is triggered. Specifically, the first monitoring resource set can be determined based on a specific resource reservation period set (pre-configured or) configured by the resource pool used in the direct transmission, and based on the time-frequency position of the candidate time-frequency resources. The specific resource reservation period set can be a subset of all resource reservation period sets supported by the resource pool.

[0063] For example, when the UE performs periodic resource selection based on partial monitoring, it needs to select Y time units from the resource selection window, where Y>=Y min , and for the selected time unit y, the UE needs to reserve} to perform channel monitoring, where k is a positive integer, P reserve For any one of the cycles in the set of cycles reserved for the specific resource, k is such that yk*P reserve The smallest positive integer less than y0, where y0 is the earliest time unit among Y time units. In this case, the UE needs to wait for the nearest time unit before y0 and the time unit y to be separated by P. reserve Channel monitoring is performed on a time unit that is an integer multiple of y; or for the selected time unit y, the UE needs to monitor the channel in the time unit set {yP reserve} to monitor the channel, P reserve Several periods in the period set may be reserved for the specific resource, for example, P reserve The time units y-1 and y-2 are 100, 200, 300, 400, 500, 600, 700, 800, 900 and 1000, so the UE needs to perform channel monitoring on time unit y-100, time unit y-200, time unit y-300, time unit y-400, time unit y-500, time unit y-600, time unit y-700, time unit y-800, time unit y-900 and time unit y-1000.

[0064] On the contrary, if the UE cannot select no less than the first threshold number of candidate time-frequency resources that meet the first monitoring condition from the time-frequency resources to be selected, the UE cannot select the candidate time-frequency resources by performing periodic resource selection based on partial monitoring. Therefore, in this embodiment, in the resource selection process triggered by periodic direct transmission, if the UE's sending resource pool supports periodic resource reservation and the UE is configured to perform resource selection based on partial monitoring, but the time-frequency resources to be selected do not meet the conditions required by the first resource selection mode, that is, the number of candidate time-frequency resources that meet the first monitoring condition in the time-frequency resources to be selected (such as the time-frequency resources in the resource selection window) does not exceed the first threshold, the UE will perform non-periodic resource selection based on partial monitoring.

[0065] Since the UE does not need to reserve periodic resources in the direct transmission on the selected resources when performing non-periodic resource selection based on partial monitoring, the partial monitoring conditions that need to be met for non-periodic resource selection based on partial monitoring are more relaxed than those for periodic resource selection based on partial monitoring.

[0066] In some embodiments, the first threshold is preconfigured or determined according to a threshold carried in downlink signaling received from the network device.

[0067] The first threshold may be preset, for example, set according to protocol regulations, or may be determined as the first threshold by receiving downlink signaling from a network device, where the threshold carried in the downlink signaling is determined as the first threshold.

[0068] According to the direct communication resource selection method of the embodiment of the present disclosure, in the resource selection process triggered by periodic direct transmission, when the sending resource pool of the user equipment supports periodic resource reservation and the user equipment is configured to perform resource selection based on partial monitoring and the time-frequency resources to be selected do not meet the conditions required by the first resource selection mode, resource selection is performed according to the second resource selection mode, wherein the first resource selection mode is used to select resources for direct transmission with periodic resource reservation, and the second resource selection mode is used to select resources for direct transmission without periodic resource reservation. In this way, if the UE cannot provide sufficient channel monitoring results in the resource selection process based on partial monitoring triggered by periodic direct transmission, it can perform resource selection according to the resource selection mode used to select resources for direct transmission without periodic resource reservation, thereby improving data transmission performance.

[0069] Figure 3 FIG. 1 shows a flow chart of a method for selecting direct communication resources according to an embodiment of the present disclosure. Figure 3 As shown, the method can be executed by the transmitting end UE and includes the following steps.

[0070] S301, in the resource selection process triggered by periodic direct transmission, when the UE's sending resource pool supports periodic resource reservation and the UE is configured to perform resource selection based on partial monitoring and the time-frequency resources to be selected do not meet the conditions required by the first resource selection mode, resource selection is performed according to the second resource selection mode.

[0071] The first resource selection mode is used to select resources for direct transmission with periodic resource reservation, and the second resource selection mode is used to select resources for direct transmission without periodic resource reservation.

[0072] In some embodiments, when the resource selection process is triggered, MAC layer or higher layer signaling indicates that the resource reservation period is greater than 0. The higher layer may be an RLC layer, a PDCP layer, an RRC layer and / or an application layer.

[0073] In some embodiments, the conditions required for the first resource selection mode include: the number of candidate time-frequency resources that meet the first monitoring condition in the time-frequency resources to be selected exceeds a first threshold; wherein, the first monitoring condition includes: the UE monitors on a first monitoring resource set; wherein the first monitoring resource set is determined based on a specific resource reservation period set and the time-frequency position of the candidate time-frequency resources.

[0074] In some embodiments, the first threshold is preconfigured or determined according to a threshold carried in downlink signaling received from the network device.

[0075] For a detailed description of the above step S301 and its related details, please refer to the description of step S201 and its related details, which will not be repeated here.

[0076] In addition, in some embodiments, the above step S301 may include any one of the following steps:

[0077] S3011: Select candidate time-frequency resources that meet a second monitoring condition and are no less than a second threshold from the time-frequency resources to be selected.

[0078] Among them, the second monitoring condition includes: the UE monitors on the second monitoring resource set; wherein the second monitoring resource set is determined according to the specific resource reservation period set and the time-frequency position of the candidate time-frequency resources; or is determined only according to the time-frequency position of the candidate time-frequency resources.

[0079] When the UE performs non-periodic resource selection based on partial monitoring, the UE can select candidate time-frequency resources that are not less than the second threshold from the time-frequency resources to be selected, and the candidate time-frequency resources meet the second monitoring condition, that is, the UE monitors on the second monitoring resource set. The second monitoring resource set can be determined based on a specific resource reservation period set and the time-frequency position of the candidate time-frequency resource, or can be determined only based on the time-frequency position of the candidate time-frequency resource. Specifically, the second monitoring resource set can be determined based on a specific resource reservation period set configured according to the resource pool used in the direct transmission and based on the time-frequency position of the candidate time-frequency resource. The specific resource reservation period set can be a subset of all resource reservation period sets supported by the resource pool; or, the second monitoring resource set can be determined only based on the time-frequency position of the candidate time-frequency resource. Thus, compared with the periodic resource selection based on partial monitoring, the partial monitoring conditions required for the non-periodic resource selection based on partial monitoring are more relaxed, because the monitoring resource set corresponding to the candidate time-frequency resource can be determined only based on the time-frequency position of the candidate time-frequency resource. For example, if for a certain resource, it fails to meet the requirements of monitoring on the monitoring resource set determined according to the time-frequency position of the resource and the specific resource reservation period set, but can meet the requirements of monitoring on the monitoring resource set determined only based on the time-frequency position of the resource, the resource can still be determined as a candidate resource.

[0080] For example, when the UE performs aperiodic resource selection based on partial monitoring, it can select Y' time units from the resource selection window, where Y'>=Y' min , and for the selected time unit y', the UE needs to be in the time unit set {y'-k'*P' reserve} for channel monitoring, where k' is a positive integer, P' reserve For any one of the cycles in the set of cycles reserved for the specific resource, k' is such that y'-k'*P' reserve The smallest positive integer less than y0', where y0' is the earliest time unit among Y' time units. In this case, the UE needs to monitor the nearest time unit before y0' with an interval of P' between time unit y' reserve or for the selected time unit y', the UE needs to be in the time unit set {y'-P' reserve} to monitor the channel, P' reserve Several periods in the period set may be reserved for the specific resource, for example, P' reserveis 100, 200, 300, 400, 500, 600, 700, 800, 900, and 1000. Therefore, the UE needs to perform channel monitoring for time unit y'-100, time unit y'-200, time unit y'-300, time unit y'-400, time unit y'-500, y'-600, time unit y'-700, time unit y'-800, time unit y'-900, and time unit y'-1000. In the above two examples, the time unit set is determined according to the specific resource reservation period set and the time-frequency position of the selected time unit.

[0081] For another example, when the UE performs aperiodic resource selection based on partial monitoring, it can select Y' time units from the resource selection window, where Y'>=Y' min , and for any selected time unit y', the UE needs to perform channel monitoring in the time unit set [y'–M,y0], where M can be 1-31 time slots. In the above example, the time unit set is determined only according to the time-frequency position of the selected time unit.

[0082] In some embodiments, the second threshold is preconfigured or determined according to a threshold carried in downlink signaling received from the network device.

[0083] The second threshold may be preset, for example, set according to protocol regulations, or may be determined as the second threshold by receiving downlink signaling from a network device according to a threshold carried in the downlink signaling.

[0084] S3012: Perform random resource selection among the time-frequency resources to be selected.

[0085] When the UE performs non-periodic resource selection based on partial monitoring, it can perform random resource selection to select candidate time-frequency resources from the time-frequency resources to be selected. That is, it does not need to consider the channel monitoring results, but can randomly select candidate time-frequency resources from the time-frequency resources to be selected.

[0086] According to the direct communication resource selection method of the embodiment of the present disclosure, in the resource selection process triggered by periodic direct transmission, when the sending resource pool of the user equipment supports periodic resource reservation and the user equipment is configured to perform resource selection based on partial monitoring and the time-frequency resources to be selected do not meet the conditions required by the first resource selection mode, resource selection is performed according to the second resource selection mode, wherein the first resource selection mode is used to select resources for direct transmission with periodic resource reservation, and the second resource selection mode is used to select resources for direct transmission without periodic resource reservation. In this way, if the UE cannot provide sufficient channel monitoring results in the resource selection process based on partial monitoring triggered by periodic direct transmission, it can perform resource selection according to the resource selection mode used to select resources for direct transmission without periodic resource reservation, thereby improving data transmission performance.

[0087] Figure 4 FIG. 1 shows a flow chart of a method for selecting direct communication resources according to an embodiment of the present disclosure. Figure 4 As shown, the method can be executed by the transmitting end UE and includes the following steps.

[0088] S401, in the resource selection process triggered by periodic direct transmission, when the UE's sending resource pool supports periodic resource reservation and the UE is configured to perform resource selection based on partial monitoring and the time-frequency resources to be selected do not meet the conditions required by the first resource selection mode, resource selection is performed according to the second resource selection mode.

[0089] The first resource selection mode is used to select resources for direct transmission with periodic resource reservation, and the second resource selection mode is used to select resources for direct transmission without periodic resource reservation.

[0090] In some embodiments, when the resource selection process is triggered, MAC layer or higher layer signaling indicates that the resource reservation period is greater than 0. The higher layer may be an RLC layer, a PDCP layer, an RRC layer and / or an application layer.

[0091] In some embodiments, the conditions required for the first resource selection mode include: the number of candidate time-frequency resources that meet the first monitoring condition in the time-frequency resources to be selected exceeds a first threshold; wherein, the first monitoring condition includes: the UE monitors on a first monitoring resource set; wherein the first monitoring resource set is determined based on a specific resource reservation period set and the time-frequency position of the candidate time-frequency resources.

[0092] In some embodiments, the first threshold is preconfigured or determined according to a threshold carried in downlink signaling received from the network device.

[0093] For a detailed description of the above step S401 and its related details, please refer to the description of steps S201 and S301 and their related details, which will not be repeated here.

[0094] S402: Instruct the MAC layer or a higher layer via the physical layer to perform resource selection according to a second resource selection mode during a resource selection process. The higher layer may be an RLC layer, a PDCP layer, an RRC layer, and / or an application layer.

[0095] As mentioned above, in the resource selection process triggered by periodic direct transmission, usually when the UE's sending resource pool supports periodic resource reservation, the UE is expected to be triggered to perform periodic resource selection. However, if the UE performs non-periodic resource selection in the resource selection process triggered by periodic direct transmission, that is, the UE does not perform periodic resource selection as expected, it is necessary to indicate to the MAC layer or higher layer through the physical layer to perform non-periodic resource selection in the resource selection process.

[0096] Specifically, after the UE selects a candidate time-frequency resource set by performing non-periodic resource selection based on partial selection, the physical layer needs to report the candidate time-frequency resource set to the MAC layer or higher layers, and at the same time indicate that the candidate time-frequency resource set is selected by the UE by performing resource selection according to the second resource selection mode.

[0097] According to the direct communication resource selection method of an embodiment of the present disclosure, in the resource selection process triggered by periodic direct transmission, the transmitting user equipment performs resource selection according to the second resource selection mode when the sending resource pool of the user equipment supports periodic resource reservation and the user equipment is configured to perform resource selection based on partial monitoring and the time-frequency resources to be selected do not meet the conditions required by the first resource selection mode, wherein the first resource selection mode is used to select resources for direct transmission with periodic resource reservation, and the second resource selection mode is used to select resources for direct transmission without periodic resource reservation, and when reporting the candidate time-frequency resource set, it is also indicated that the candidate time-frequency resource set is selected according to the second resource selection mode, so that the MAC layer or higher layer can know that the candidate time-frequency resource set is selected according to the second resource selection mode rather than the first resource selection mode.

[0098] In the embodiments provided above, the methods provided in the embodiments of the present application are described from the perspective of a user device. To implement the various functions of the methods provided in the embodiments of the present application, the user device may include a hardware structure and a software module, and implement the aforementioned functions in the form of a hardware structure, a software module, or a hardware structure plus a software module. One of the aforementioned functions may be implemented in the form of a hardware structure, a software module, or a hardware structure plus a software module.

[0099] Corresponding to the direct communication resource selection methods provided in the above-mentioned embodiments, the present disclosure further provides a direct communication resource selection device. Since the direct communication resource selection device provided in the embodiments of the present disclosure corresponds to the direct communication resource selection methods provided in the above-mentioned embodiments, the implementation methods of the direct communication resource selection method are also applicable to the direct communication resource selection device provided in this embodiment and will not be described in detail in this embodiment.

[0100] Figure 5 A schematic structural diagram of a direct communication resource selection device 500 provided in an embodiment of the present disclosure.

[0101] like Figure 5 As shown, the apparatus 500 may include a processing module 501 .

[0102] The processing module 501 is used to perform resource selection according to the second resource selection mode in the resource selection process triggered by periodic direct transmission, when the UE's sending resource pool supports periodic resource reservation and the UE is configured to perform resource selection based on partial monitoring and the time-frequency resources to be selected do not meet the conditions required by the first resource selection mode; wherein the first resource selection mode is used to select resources for direct transmission with periodic resource reservation, and the second resource selection mode is used to select resources for direct transmission without periodic resource reservation.

[0103] According to the direct communication resource selection device of the embodiment of the present disclosure, in the resource selection process triggered by periodic direct transmission, the transmitting user equipment performs resource selection according to the second resource selection mode when the sending resource pool of the user equipment supports periodic resource reservation and the user equipment is configured to perform resource selection based on partial monitoring and the time-frequency resources to be selected do not meet the conditions required by the first resource selection mode, wherein the first resource selection mode is used to select resources for direct transmission with periodic resource reservation, and the second resource selection mode is used to select resources for direct transmission without periodic resource reservation. In this way, if the UE cannot provide sufficient channel monitoring results in the resource selection process based on partial monitoring triggered by periodic direct transmission, it can perform resource selection according to the resource selection mode used to select resources for direct transmission without periodic resource reservation, thereby improving data transmission performance.

[0104] In some embodiments, when the resource selection process is triggered, the media access control MAC layer or a higher layer indicates that the resource reservation period is not 0, and the higher layer includes the RLC layer, the PDCP layer, the RRC layer and / or the application layer, wherein the resource reservation period indicates the time interval between the resources required to be reserved when the UE performs periodic resource reservation.

[0105] In some embodiments, the conditions required for the first resource selection mode include: the number of candidate time-frequency resources that meet the first monitoring condition in the time-frequency resources to be selected exceeds a first threshold; wherein, the first monitoring condition includes: the UE monitors on a first monitoring resource set; wherein the first monitoring resource set is determined based on a specific resource reservation period set and the time-frequency position of the candidate time-frequency resources.

[0106] In some embodiments, the processing module 501 is used to: select candidate time-frequency resources that meet a second monitoring condition and are not less than a second threshold from the time-frequency resources to be selected; wherein, the second monitoring condition includes: the UE monitors on a second monitoring resource set; wherein the second monitoring resource set is determined based on a specific resource reservation period set and the time-frequency position of the candidate time-frequency resources; or is determined only based on the time-frequency position of the candidate time-frequency resources.

[0107] In some embodiments, the processing module 501 is used to: perform random resource selection among the time-frequency resources to be selected.

[0108] In some embodiments, the first threshold is preconfigured or determined according to a threshold carried in downlink signaling received from the network device; the second threshold is preconfigured or determined according to a threshold carried in downlink signaling received from the network device.

[0109] In some embodiments, as Figure 6 As shown, the device 500 also includes: a transceiver module 502, which is used to indicate to the MAC layer or a higher layer through the physical layer that resource selection is performed according to the second resource selection mode during the resource selection process, and the higher layer includes the RLC layer, PDCP layer, RRC layer and / or application layer.

[0110] See Figure 7 , Figure 7 7 is a schematic diagram of the structure of a communication device 700 provided in an embodiment of the present application. Communication device 700 can be user equipment, or a chip, chip system, or processor that supports network equipment to implement the above-mentioned method. It can also be a chip, chip system, or processor that supports user equipment to implement the above-mentioned method. This device can be used to implement the method described in the above-mentioned method embodiment. For details, please refer to the description of the above-mentioned method embodiment.

[0111] The communication device 700 may include one or more processors 701. The processor 701 may be a general-purpose processor or a dedicated processor. For example, it may be a baseband processor or a central processing unit. The baseband processor may be used to process communication protocols and communication data, and the central processing unit may be used to control the communication device (e.g., a base station, a baseband chip, a terminal device, a terminal device chip, a DU or CU, etc.), execute computer programs, and process computer program data.

[0112] Optionally, the communication device 700 may further include one or more memories 702, on which a computer program 704 may be stored. The processor 701 executes the computer program 704 to cause the communication device 700 to perform the method described in the above method embodiment. Optionally, the memory 702 may also store data. The communication device 700 and the memory 702 may be provided separately or integrated together.

[0113] Optionally, the communication device 700 may further include a transceiver 705 and an antenna 706. The transceiver 705 may be referred to as a transceiver unit, a transceiver, or a transceiver circuit, etc., and is configured to implement transceiver functions. The transceiver 705 may include a receiver and a transmitter. The receiver may be referred to as a receiver or a receiving circuit, etc., and is configured to implement a receiving function; the transmitter may be referred to as a transmitter or a transmitting circuit, etc., and is configured to implement a transmitting function.

[0114] Optionally, the communication device 700 may further include one or more interface circuits 707. The interface circuit 707 is configured to receive code instructions and transmit the code instructions to the processor 701. The processor 701 executes the code instructions to enable the communication device 700 to perform the method described in the above method embodiment.

[0115] The communication device 700 is a user equipment: the processor 701 is used to execute Figure 2 Step S201 in Figure 3 S301, including S3011-S3012, Figure 4 S401 in; transceiver 705 is used to perform Figure 4 Step S402 in .

[0116] In one implementation, the processor 701 may include a transceiver for implementing receiving and transmitting functions. For example, the transceiver may be a transceiver circuit, an interface, or an interface circuit. The transceiver circuit, interface, or interface circuit for implementing the receiving and transmitting functions may be separate or integrated. The transceiver circuit, interface, or interface circuit may be used for reading and writing code / data, or may be used for transmitting or delivering signals.

[0117] In one implementation, processor 701 may store a computer program 703. Computer program 703, when executed on processor 701, enables communication device 700 to perform the method described in the above method embodiment. Computer program 703 may be embedded in processor 701, in which case processor 701 may be implemented by hardware.

[0118] In one implementation, the communication device 700 may include a circuit that can implement the functions of sending, receiving, or communicating in the aforementioned method embodiments. The processor and transceiver described in this application can be implemented on an integrated circuit (IC), an analog IC, a radio frequency integrated circuit RFIC, a mixed signal IC, an application specific integrated circuit (ASIC), a printed circuit board (PCB), an electronic device, etc. The processor and transceiver can also be manufactured using various IC process technologies, such as complementary metal oxide semiconductor (CMOS), N-type metal oxide semiconductor (nMetal-oxide-semiconductor, NMOS), P-type metal oxide semiconductor (positive channel metal oxide semiconductor, PMOS), bipolar junction transistor (bipolar junction transistor, BJT), bipolar CMOS (BiCMOS), silicon germanium (SiGe), gallium arsenide (GaAs), etc.

[0119] The communication device described in the above embodiments may be a network device or a user device, but the scope of the communication device described in this application is not limited thereto, and the structure of the communication device may not be limited thereto. Figure 7 The communication device may be an independent device or may be part of a larger device. For example, the communication device may be:

[0120] (1) An independent integrated circuit (IC), or chip, or chip system or subsystem;

[0121] (2) a collection of one or more ICs, optionally including a storage component for storing data and computer programs;

[0122] (3) ASIC, such as modem;

[0123] (4) Modules that can be embedded in other devices;

[0124] (5) Receivers, terminal devices, intelligent terminal devices, cellular phones, wireless devices, handheld devices, mobile units, vehicle-mounted devices, network devices, cloud devices, artificial intelligence devices, etc.;

[0125] (6)Others, etc.

[0126] For the case where the communication device may be a chip or a chip system, see Figure 8 Schematic diagram of the chip structure shown. Figure 8 The chip shown includes a processor 801 and an interface 802. There may be one or more processors 801 and there may be more than one interface 802.

[0127] For the case where the chip is used to implement the functions of the user equipment in the embodiment of the present application: the processor 801 is used to execute Figure 2 Step S201 in Figure 3 S301, including S3011-S3012, Figure 4 S401 in; interface 802 is used to execute Figure 4 Step S402 in .

[0128] Optionally, the chip further includes a memory 803, which is used to store necessary computer programs and data.

[0129] Those skilled in the art will also appreciate that the various illustrative logical blocks and steps listed in the embodiments of the present application can be implemented by electronic hardware, computer software, or a combination of both. Whether such functions are implemented by hardware or software depends on the specific application and the design requirements of the entire system. Those skilled in the art may use various methods to implement the described functions for each specific application, but such implementation should not be construed as exceeding the scope of protection of the embodiments of the present application.

[0130] The embodiment of the present application also provides a system for implementing direct communication resource selection, the system comprising the aforementioned Figure 5 、 Figure 6 In the embodiment, the communication device as the user equipment, or the system includes the aforementioned Figure 7 The communication device in the embodiment serves as user equipment.

[0131] The present application also provides a readable storage medium having instructions stored thereon, which implement the functions of any of the above method embodiments when executed by a computer.

[0132] The present application also provides a computer program product, which implements the functions of any of the above method embodiments when executed by a computer.

[0133] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs. When the computer program is loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer program can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer program can be transmitted from one website, computer, server or data center to another website, computer, server or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that includes one or more available media integrated. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a high-density digital video disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0134] It can be understood that the time units involved in the embodiments of the present disclosure may be physical time units or logical time units, such as seconds, milliseconds, microseconds, frames, subframes, time slots, orthogonal frequency division multiplexing symbols, etc.

[0135] It can be understood that the time-frequency resources involved in the embodiments of the present disclosure may include time domain resources and / or frequency domain resources. Accordingly, the time-frequency position of the time-frequency resources represents the time domain position of the time domain resources and / or the frequency domain position of the frequency domain resources.

[0136] Those skilled in the art will understand that the various numerical numbers such as first and second involved in this application are only for the convenience of description and are not used to limit the scope of the embodiments of this application, and also indicate the order of precedence.

[0137] In this application, at least one can also be described as one or more, and multiple can be two, three, four or more, which is not limited in this application. In the embodiments of this application, for a technical feature, the technical features in the technical feature are distinguished by "first", "second", "third", "A", "B", "C" and "D", and there is no order of precedence or size between the technical features described by "first", "second", "third", "A", "B", "C" and "D".

[0138] As used herein, the terms "machine-readable medium" and "computer-readable medium" refer to any computer program product, apparatus, and / or device (e.g., a magnetic disk, an optical disk, a memory, a programmable logic device (PLD)) for providing machine instructions and / or data to a programmable processor, including a machine-readable medium that receives machine instructions as a machine-readable signal. The term "machine-readable signal" refers to any signal for providing machine instructions and / or data to a programmable processor.

[0139] The systems and techniques described herein can be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such back-end components, middleware components, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include a local area network (LAN), a wide area network (WAN), and the Internet.

[0140] Computer systems may include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The client and server relationship arises through computer programs running on the respective computers and having a client-server relationship to each other.

[0141] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in this disclosure can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions disclosed in this disclosure can be achieved. This is not limited herein.

[0142] Furthermore, it should be understood that the various embodiments described herein may be implemented individually or in combination with other embodiments where the solution permits.

[0143] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0144] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0145] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A method for selecting direct communication resources, characterized in that: The method is performed by a transmitting user equipment UE, and the method includes: In a resource selection process triggered by periodic direct transmission, when the transmitting resource pool of the UE supports periodic resource reservation and the UE is configured to perform resource selection based on partial monitoring and the time-frequency resources to be selected do not meet the conditions required by the first resource selection mode, performing resource selection according to the second resource selection mode, where the time-frequency resources to be selected are time-frequency resources in the resource selection window adopted by the UE when performing resource selection; The first resource selection mode is used to select resources for direct transmission with periodic resource reservation, and the second resource selection mode is used to select resources for direct transmission without periodic resource reservation.

2. The method according to claim 1, wherein When the resource selection process is triggered, the media access control MAC layer or a higher layer indicates that the resource reservation period is not 0, and the higher layer includes the RLC layer, the PDCP layer, the RRC layer and / or the application layer, wherein the resource reservation period indicates the time interval between the resources required to be reserved when the UE performs periodic resource reservation.

3. The method according to claim 1, wherein The conditions required for the first resource selection mode include: The number of candidate time-frequency resources that meet the first monitoring condition in the time-frequency resources to be selected exceeds a first threshold; The first monitoring condition includes: The UE monitors on a first monitoring resource set; wherein the first monitoring resource set is determined according to a specific resource reservation period set and a time-frequency position of candidate time-frequency resources.

4. The method according to any one of claims 1 to 3, wherein The performing resource selection according to the second resource selection mode includes: Selecting candidate time-frequency resources that meet a second monitoring condition and are not less than a second threshold from the time-frequency resources to be selected; Among them, the second monitoring condition includes: the UE monitors on the second monitoring resource set; wherein the second monitoring resource set is determined according to the specific resource reservation period set and the time-frequency position of the candidate time-frequency resources; or is determined only according to the time-frequency position of the candidate time-frequency resources.

5. The method according to any one of claims 1 to 3, wherein The performing resource selection according to the second resource selection mode includes: Random resource selection is performed among the time-frequency resources to be selected.

6. The method of claim 1 , further comprising: Instructing the MAC layer or a higher layer through the physical layer to perform resource selection according to the second resource selection mode in the resource selection process, the higher layer including the RLC layer, the PDCP layer, the RRC layer and / or the application layer.

7. A direct communication resource selection device, characterized in that: include: a processing module, configured to, in a resource selection process triggered by periodic direct transmission, perform resource selection according to a second resource selection mode when a transmission resource pool of the UE supports periodic resource reservation and the UE is configured to perform resource selection based on partial monitoring and the time-frequency resources to be selected do not meet the conditions required by the first resource selection mode, wherein the time-frequency resources to be selected are time-frequency resources in a resource selection window adopted by the UE when performing resource selection; The first resource selection mode is used to select resources for direct transmission with periodic resource reservation, and the second resource selection mode is used to select resources for direct transmission without periodic resource reservation.

8. The device according to claim 7, wherein When the resource selection process is triggered, the media access control MAC layer or a higher layer indicates that the resource reservation period is not 0, and the higher layer includes the RLC layer, the PDCP layer, the RRC layer and / or the application layer, wherein the resource reservation period indicates the time interval between the resources required to be reserved when the UE performs periodic resource reservation.

9. The device according to claim 7, wherein The conditions required for the first resource selection mode include: The number of candidate time-frequency resources that meet the first monitoring condition in the time-frequency resources to be selected exceeds a first threshold; The first monitoring condition includes: The UE monitors on a first monitoring resource set; wherein the first monitoring resource set is determined according to a specific resource reservation period set and a time-frequency position of candidate time-frequency resources.

10. The device according to any one of claims 7 to 9, characterized in that The processing module is used for: Selecting candidate time-frequency resources that meet a second monitoring condition and are no less than a second threshold from the time-frequency resources to be selected; The second monitoring condition includes: The UE monitors on a second monitoring resource set; wherein the second monitoring resource set is determined according to a specific resource reservation period set and the time-frequency position of the candidate time-frequency resources; or is determined only according to the time-frequency position of the candidate time-frequency resources.

11. The device according to any one of claims 7 to 9, characterized in that The processing module is used for: Random resource selection is performed among the time-frequency resources to be selected.

12. The device according to claim 7, wherein Also includes: The transceiver module indicates to the MAC layer or a higher layer through the physical layer that resource selection is performed according to the second resource selection mode during the resource selection process, and the higher layer includes the RLC layer, the PDCP layer, the RRC layer and / or the application layer.

13. A communication device, wherein: include: transceiver; Memory; A processor is connected to the transceiver and the memory, respectively, and is configured to control the wireless signal reception and transmission of the transceiver by executing computer-executable instructions on the memory, and is capable of implementing the method described in any one of claims 1 to 6.

14. A computer storage medium, wherein: The computer storage medium stores computer-executable instructions; after the computer-executable instructions are executed by the processor, the method according to any one of claims 1 to 6 can be implemented.

15. A computer program product, wherein when the computer program product is executed by a computer, the method according to any one of claims 1 to 6 is implemented.

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