CN115399024A - Method and terminal device for resource selection - Google Patents

Abstract

The application provides a method and a terminal device for resource selection, wherein the method comprises the following steps: the first terminal device determines RSRP information of auxiliary candidate resources within an auxiliary resource selection window, wherein the RSRP information is based on RSRP values of the auxiliary candidate resources and is used for indicating available conditions of the auxiliary candidate resources; the first terminal device sends first indication information to the second terminal device, wherein the first indication information comprises RSRP information of the auxiliary candidate resources. According to the method, the receiving device assists the sending device in selecting the resources, and the possibility that the selected resources meet the transmission requirement can be improved. The first terminal device determines RSRP information of the auxiliary candidate resources and sends the RSRP information to the second terminal device, the second terminal device selects the sending resources, the first indication information is unbound with the size and the priority of the data to be sent, the utilization rate of the RSRP information can be improved, the burden of the first terminal device is reduced, and the efficiency of resource selection is improved.

Description

Method and terminal device for resource selection Technical Field

The present application relates to the field of wireless communications, and more particularly, to a method and a terminal apparatus for resource selection.

Background

Wireless communication technology has experienced rapid development in the past decades, and services supported by wireless communication systems have also developed from the first support of only voice and short messages to the present support of wireless high-speed data communication. Various new wireless service types, such as internet of things (IoT), automatic driving, etc., are emerging, and higher requirements are put forward on the next generation wireless communication system, i.e., a New Radio (NR) communication system, i.e., a 5G (5 th generation) communication system.

From 4G systems, vehicle-to-apparatus (V2X) communication and device-to-device (D2D) communication are gaining popularity in the industry. V2X communication refers to communication between a vehicle and anything outside, and includes vehicle-to-vehicle (V2V) communication, vehicle-to-pedestrian (V2P) communication, vehicle-to-infrastructure (V2I) communication, vehicle-to-network (V2N) communication, and the like. V2X communication under NR system provides support for lower transmission delay (e.g., transmission delay as low as 20 ms), more reliable communication transmission (e.g., reliability as high as 99.999%), higher throughput (e.g., throughput as high as 1 Gbps), and better user experience compared to 4G system, so as to meet the requirements of wider application scenarios.

V2X communication and D2D communication under the NR system may select data transmission through Sidelink (SL). The resource allocation for SL transmission has two modes: one is a base station assigned resource mode (mode-1), and the other is a User Equipment (UE) self-selected resource mode (mode-2). The base station resource allocation mode (mode-1) is mainly applied to V2X communication under a network coverage condition, and the base station performs resource allocation uniformly according to a Buffer Status Report (BSR) of the UE. In the user equipment autonomous resource mode (mode-2), the transmission resources of the transmitting UE are not dependent on the base station. Of course, mode-2 is not limited to network coverage, and a transmitting UE may communicate in mode-2 without network coverage. In the existing scheme of selecting a resource mode by user equipment, a sending UE selects a resource for sending data only according to its own perception (sensing), which has the problems of "hidden terminal" and "exposed terminal", and the selected resource may not meet the transmission requirement.

Disclosure of Invention

The application provides a method and a terminal device for resource selection, wherein a receiving device assists a sending device in resource selection, the possibility that the selected resources meet transmission requirements can be improved, and the efficiency of assisting resource selection can also be improved.

In a first aspect, a method for resource selection is provided, including: the first terminal device determines Reference Signal Receiving Power (RSRP) information of the secondary candidate resources within the secondary resource selection window, the RSRP information being based on RSRP values of the secondary candidate resources for indicating availability of the secondary candidate resources. The first terminal device sends first indication information to the second terminal device, the first indication information comprises RSRP information of the auxiliary candidate resources, and the first indication information is used for assisting the second terminal device to select the transmission resources to send data to be sent.

In the method for resource selection according to the first aspect, the receiving apparatus assists the transmitting apparatus in resource selection, and the possibility that the selected resources meet the transmission requirement can be improved. The method comprises the steps that a first terminal device serving as a receiving device determines RSRP information of auxiliary candidate resources, first indication information comprising the RSRP information is sent to a second terminal device serving as a sending device, the second terminal device selects the sending resources, and the first indication information is unbound with the size and priority of data to be sent by the sending device, so that the RSRP information can be repeatedly utilized at different sending devices, the utilization rate of the RSRP information can be improved, the measurement burden of the first terminal device is reduced, and the efficiency of auxiliary resource selection is improved.

In a possible implementation manner of the first aspect, the RSRP information includes an RSRP value or a resource availability level value, where a size of the RSRP value is negatively related to availability of the secondary candidate resource and a size of the resource availability level value is positively related to availability of the secondary candidate resource. The possible implementation manner is not limited to the specific form of the RSRP information, so that the RSRP information is more flexibly expressed.

In one possible implementation manner of the first aspect, before the first terminal device determines RSRP information of the secondary candidate resource within the secondary resource selection window, the method may further include: the first terminal device determines a secondary resource awareness window and a secondary resource selection window.

In one possible implementation form of the first aspect, the first terminal device may periodically perform the method for resource selection of the first aspect. The possible implementation mode does not need the second terminal device to send a trigger message to trigger the first terminal device to perform auxiliary resource sensing and selection, when the second terminal device has data to be sent, the first indication information of the first terminal device can be directly used for selecting the sending resource, a triggered information interaction flow is not needed, and the signaling overhead of a system and the time delay of data transmission can be reduced.

In a possible implementation manner of the first aspect, the first terminal device may perform the method for resource selection of the first aspect when data to be transmitted needs to be transmitted. The possible implementation mode does not need the second terminal device to send a trigger message to trigger the first terminal device to perform auxiliary resource sensing and selection, when the second terminal device has data to be sent, the first indication information of the first terminal device can be directly used for selecting the sending resource, a triggered information interaction process is not needed, and the signaling overhead of a system and the time delay of data transmission can be reduced.

In one possible implementation form of the first aspect, the first indication information may be transmitted together with data transmitted by the first terminal device. The possible implementation mode can save the process that the first terminal device monitors the first indication information and requests resources, reduce the burden of the first terminal device and save the signaling and resource overhead.

In a possible implementation manner of the first aspect, the determining, by the first terminal device, RSRP information of the secondary candidate resource within the secondary resource selection window may include: and the first terminal device determines the RSRP information of the corresponding auxiliary candidate resource in the auxiliary resource selection window according to the RSRP value of the received signal measured in the auxiliary resource sensing window. The resources in the secondary resource selection window are transmission resources that may be adopted at a future time, and no signal is currently transmitted on the transmission resources, so that the RSRP values of the resources in the secondary resource selection window cannot be directly measured, and the result of the secondary resource sensing window measurement can be used as an approximate result of the RSRP of the resources in the secondary resource selection window.

In a possible implementation manner of the first aspect, the determining, by the first terminal device, RSRP information of a corresponding secondary candidate resource in the secondary resource selection window according to an RSRP value of a received signal measured in the secondary resource sensing window includes: when the side-link control information SCI on the physical side-link control channel PSCCH received by the first terminal device in the auxiliary resource sensing window comprises resource reservation information and the reserved resource indicated by the resource reservation information is located in the auxiliary resource selection window, the first terminal device determines the RSRP information of the auxiliary candidate resource corresponding to the reserved resource in the auxiliary resource selection window according to the RSRP value of the PSCCH or the RSRP value of the physical side-link shared channel PSSCH associated with the PSCCH. The RSRP information of the auxiliary candidate resources obtained through the possible implementation mode is closer to the RSRP real situation of the auxiliary candidate resources in the auxiliary resource selection window.

In a possible implementation manner of the first aspect, the determining, by the first terminal device, RSRP information of an auxiliary candidate resource corresponding to the reserved resource in the auxiliary resource selection window according to an RSRP value of the PSCCH or according to an RSRP value of a physical uplink shared channel psch associated with the PSCCH, by the first terminal device, may include: and the first terminal device determines the RSRP information of the auxiliary candidate resource corresponding to the reserved resource in the auxiliary resource selection window according to the RSRP value of the PSCCH or the PSSCH and the priority of the data corresponding to the reserved resource. In the possible implementation mode, the RSRP information of the auxiliary candidate resource is determined by considering the priority of the data corresponding to the reserved resource, so that the rationality of resource selection can be improved.

In a possible implementation manner of the first aspect, when the RSRP information includes an RSRP value, the first terminal device determines RSRP information of a secondary candidate resource within a secondary resource selection window, and the method may further include: the first terminal device determines the RSRP value of the auxiliary candidate resource which is not reserved in the auxiliary resource selection window as the minimum value of the value range; the first terminal device determines the RSRP value of the auxiliary candidate resource which cannot be used in the auxiliary resource selection window as the maximum value of the value range; or, when the RSRP information includes the resource availability level value, the first terminal device determines RSRP information of a secondary candidate resource within a secondary resource selection window, and the method may further include: the first terminal device determines the resource available grade value of the auxiliary candidate resource which is not reserved in the auxiliary resource selection window as the maximum value of the value range; the first terminal device determines the resource availability rating value of the auxiliary candidate resource which is not available in the auxiliary resource selection window as the minimum value of the value range. This possible implementation determines reasonable RSRP information for the unreserved secondary candidate resources and the unusable secondary candidate resources.

In one possible implementation of the first aspect, the RSRP information may be a quantized value of the RSRP value. This possible implementation may convert a continuous value of RSRP values into one point value for ease of use.

In a possible implementation manner of the first aspect, the first indication information further includes time information of the secondary resource selection window. If the second terminal device does not indicate the time information of the secondary resource selection window to the first terminal device, the first terminal device may feed back the time information of the secondary resource selection window together in the first indication information to the second terminal device; the first terminal device may not feed back the time information of the secondary resource selection window in the first indication information if the second terminal device indicates the time information of the secondary resource selection window to the first terminal device. In this possible implementation manner, the first terminal device feeds back the time information of the auxiliary resource selection window to the second terminal device, so that the specific situation of the auxiliary resource selection window can be determined, and accurate sensing and selection of resources are facilitated.

In a possible implementation manner of the first aspect, the size of the auxiliary candidate resource in the frequency domain is determined according to configuration information of the resource pool, or a factory configuration parameter of the first terminal apparatus, or a sub-channel.

In a possible implementation manner of the first aspect, the first indication information may be carried by a Control Element (CE) of a Media Access Control (MAC), that is, a MAC CE. The MAC CE is typically located above the physical layer. The first indication information may also be carried by the sidelink SCI. The sidelink SCI is typically located at the physical layer. The first indication information may also be carried by higher layer signaling, such as Radio Resource Control (RRC) signaling.

In a second aspect, a method for resource selection is provided, including: the second terminal device receives first indication information sent by the first terminal device, wherein the first indication information comprises Reference Signal Received Power (RSRP) information of auxiliary candidate resources, the RSRP information is based on RSRP values of the auxiliary candidate resources and used for indicating available conditions of the auxiliary candidate resources, and the first indication information is used for assisting the second terminal device to select sending resources used for sending data to be sent; and the second terminal device selects the transmission resource according to the size and the priority of the data to be transmitted and the first indication information.

In a possible implementation manner of the second aspect, the selecting, by the second terminal device, the transmission resource according to the size and the priority of the data to be transmitted and the first indication information may include: the second terminal device directly selects the transmission resource according to the size, the priority, the resource interception information and the first indication information of the data to be transmitted. Wherein the resource interception information is information indicating the candidate resource, which is obtained by the second terminal device itself through sensing or interception. The possible implementation mode selects the sending resource according to the combination of the resource interception information and the first indication information, so that the selected sending resource is more consistent with the actual use condition of the sending device and the receiving device, and the usability is higher.

In a possible implementation manner of the second aspect, the selecting, by the second terminal device, the transmission resource according to the size and the priority of the data to be transmitted and the first indication information may include: the second terminal device determines a first candidate resource set according to the size, the priority and the first indication information of the data to be sent; the second terminal device determines the transmission resource based on the first candidate resource set. The possible implementation mode determines the first candidate resource set according to the size, the priority and the first indication information of the data to be sent, and then selects the sending resource from the first candidate resource set, so that the selected sending resource is more reasonable and has higher availability.

In a possible implementation manner of the second aspect, the method further includes: the second terminal device determines a second candidate resource set according to the size, the priority and the resource interception information of the data to be sent; the determining, by the second terminal device, the transmission resource according to the first candidate resource set may include: the second terminal device determines the transmission resource based on the first candidate resource set and the second candidate resource set. The possible implementation mode determines the second candidate resource set according to the resource interception information of the possible implementation mode, and selects the sending resource by combining with the first candidate resource set, so that the selected sending resource is more consistent with the actual use condition of the sending device and the receiving device, and the availability is higher.

In a possible implementation manner of the second aspect, the determining, by the second terminal device, the first candidate resource set according to the size of the data to be sent, the priority and the first indication information may include: the second terminal device determines the size of a transmission resource for transmitting data to be transmitted in the frequency domain as the size of N auxiliary candidate resources in the frequency domain according to the size of the data to be transmitted, wherein N is an integer greater than zero; and the second terminal device determines a first candidate resource set according to the first indication information, wherein the first candidate resource set comprises M first candidate resources, M is an integer greater than or equal to zero, each first candidate resource comprises N auxiliary candidate resources, RSRP information of the N auxiliary candidate resources included in each first candidate resource meets the requirement of an RSRP threshold, and the RSRP threshold is a function of the priority of the data to be sent. The first candidate resource set determined according to the possible implementation manner can better meet the data transmission requirement.

In one possible implementation of the second aspect, the RSRP information includes an RSRP value or a resource availability level value, wherein a size of the RSRP value is negatively related to an availability of the secondary candidate resource and a size of the resource availability level value is positively related to an availability of the secondary candidate resource.

In a possible implementation manner of the second aspect, the first indication information further includes time information of a secondary resource selection window, and RSRP information of the secondary candidate resource is used to indicate RSRP information of each secondary candidate resource in the secondary resource selection window.

In a possible implementation manner of the second aspect, the size of the auxiliary candidate resource in the frequency domain is determined according to configuration information of the resource pool, or a factory configuration parameter of the second terminal device, or a sub-channel.

In a third aspect, a terminal device is provided, including: a processing unit, configured to determine reference signal received power, RSRP, information of an auxiliary candidate resource within an auxiliary resource selection window, where the RSRP information is based on an RSRP value of the auxiliary candidate resource and is used to indicate an available situation of the auxiliary candidate resource; and the transceiver unit is used for sending first indication information to the second terminal device, wherein the first indication information comprises RSRP information of the auxiliary candidate resources, and the first indication information is used for assisting the second terminal device to select the transmission resources to send data to be sent.

In a possible implementation manner of the third aspect, the processing unit may specifically be configured to: and determining the RSRP information of the corresponding auxiliary candidate resource in the auxiliary resource selection window according to the RSRP value of the received signal measured in the auxiliary resource perception window.

In a possible implementation manner of the third aspect, the processing unit may specifically be configured to: when the side link control information SCI on the physical side link control channel PSCCH received by the terminal device in the auxiliary resource perception window comprises resource reservation information and the reserved resource indicated by the resource reservation information is located in the auxiliary resource selection window, according to the RSRP value of the PSCCH or the RSRP value of the physical side link shared channel PSSCH associated with the PSCCH, the RSRP information of the auxiliary candidate resource corresponding to the reserved resource in the auxiliary resource selection window is determined.

In a possible implementation manner of the third aspect, the processing unit may specifically be configured to: and determining the RSRP information of the auxiliary candidate resource corresponding to the reserved resource in the auxiliary resource selection window according to the RSRP value of the PSCCH or the PSSCH and the priority of the data corresponding to the reserved resource.

In one possible implementation manner of the third aspect, the RSRP information includes an RSRP value or a resource availability level value, where a size of the RSRP value is negatively related to availability of the auxiliary candidate resource and a size of the resource availability level value is positively related to availability of the auxiliary candidate resource.

In a possible implementation manner of the third aspect, when the RSRP information includes an RSRP value, the processing unit may be further configured to: determining the RSRP value of the auxiliary candidate resource which is not reserved in the auxiliary resource selection window as the minimum value of the value range; determining the RSRP value of the auxiliary candidate resource which can not be used in the auxiliary resource selection window as the maximum value of the value range; or, when the RSRP information includes a resource availability level value, the processing unit may be further to: determining the resource available grade value of the auxiliary candidate resource which is not reserved in the auxiliary resource selection window as the maximum value of the value range; and determining the resource available grade value of the unavailable auxiliary candidate resource in the auxiliary resource selection window as the minimum value of the value range.

In a possible implementation manner of the third aspect, the first indication information may further include time information of the secondary resource selection window.

In a possible implementation manner of the third aspect, the size of the auxiliary candidate resource in the frequency domain may be determined according to configuration information of the resource pool, or may be a factory configuration parameter of the first terminal apparatus, or may be a sub-channel.

In a fourth aspect, there is provided a terminal apparatus comprising: a transceiver unit, configured to receive first indication information sent by a first terminal device, where the first indication information includes reference signal received power, RSRP, information of an auxiliary candidate resource, and the RSRP information is based on an RSRP value of the auxiliary candidate resource and is used to indicate an available condition of the auxiliary candidate resource, and the first indication information is used to assist a second terminal device to select a transmission resource for transmitting data to be transmitted; and the processing unit is used for selecting the transmission resource according to the size, the priority and the first indication information of the data to be transmitted.

In a possible implementation manner of the fourth aspect, the processing unit may be specifically configured to: determining a first candidate resource set according to the size, the priority and the first indication information of the data to be sent; and determining the sending resource according to the first candidate resource set.

In a possible implementation manner of the fourth aspect, the processing unit may be further configured to: determining a second candidate resource set according to the size, the priority and the resource interception information of the data to be sent; and determining the sending resources according to the first candidate resource set and the second candidate resource set.

In a possible implementation manner of the fourth aspect, the processing unit may be specifically configured to: determining the size of a transmission resource for transmitting data to be transmitted on a frequency domain as the size of N auxiliary candidate resources on the frequency domain according to the size of the data to be transmitted, wherein N is an integer greater than zero; and determining a first candidate resource set according to the first indication information, wherein the first candidate resource set comprises M first candidate resources, M is an integer greater than or equal to zero, each first candidate resource comprises N auxiliary candidate resources, and RSRP information of the N auxiliary candidate resources included in each first candidate resource meets the requirement of an RSRP threshold, and the RSRP threshold is a function of the priority of data to be sent.

In a possible implementation manner of the fourth aspect, the RSRP information includes an RSRP value or a resource availability level value, where a size of the RSRP value is negatively related to availability of the auxiliary candidate resource, and a size of the resource availability level value is positively related to availability of the auxiliary candidate resource.

In a possible implementation manner of the fourth aspect, the first indication information further includes time information of a secondary resource selection window, and RSRP information of the secondary candidate resources is used to indicate RSRP information of each secondary candidate resource in the secondary resource selection window.

In a possible implementation manner of the fourth aspect, the size of the auxiliary candidate resource in the frequency domain is determined according to configuration information of the resource pool, or a factory configuration parameter of the second terminal device, or a sub-channel.

In a fifth aspect, a terminal device is provided, comprising a processor and a memory, the processor being coupled to the memory, the memory being configured to store a computer program or instructions, and the processor being configured to execute the computer program or instructions in the memory to perform the method of the first aspect or any one of the possible implementations of the first aspect.

Optionally, the terminal device further comprises a communication interface, the processor being coupled to the communication interface.

In one possible implementation of the fifth aspect, the communication interface may be a transceiver, or an input/output interface.

In one possible implementation manner of the fifth aspect, the processors are one or more, and the memories are one or more.

In a possible implementation of the fifth aspect, the memory may be integrated with the processor or provided separately from the processor.

A Read Only Memory (ROM) may be integrated with the processor on the same chip, or in a specific implementation, the memory may be a non-transient memory, for example, only separately disposed on different chips.

It will be appreciated that the associated data interaction process, e.g., sending the indication information, may be a process of outputting the indication information from the processor, and receiving the capability information may be a process of receiving the input capability information from the processor. In particular, the data output by the processor may be output to a transmitter and the input data received by the processor may be from a receiver. The transmitter and receiver may be collectively referred to as a transceiver, among others.

In a sixth aspect, there is provided a terminal device comprising a processor coupled with a memory, and the memory storing a computer program or instructions, the processor being configured to execute the computer program or instructions in the memory to perform the method of the second aspect or any possible implementation manner of the second aspect.

Optionally, the terminal device further comprises a communication interface, the processor being coupled to the communication interface.

In one possible implementation of the sixth aspect, the communication interface may be a transceiver, or an input/output interface.

In one possible implementation of the sixth aspect, the communication interface may be a transceiver, or an input/output interface.

In one possible implementation manner of the sixth aspect, the processors are one or more, and the memories are one or more.

In a possible implementation of the sixth aspect, the memory may be integrated with the processor or provided separately from the processor.

A Read Only Memory (ROM) may be integrated with the processor on the same chip, or in a specific implementation, the memory may be a non-transient memory, for example, only separately disposed on different chips.

It will be appreciated that the associated data interaction process, for example, sending the indication information, may be a process of outputting the indication information from the processor, and receiving the capability information may be a process of receiving the input capability information from the processor. In particular, the data output by the processor may be output to a transmitter and the input data received by the processor may be from a receiver. The transmitter and receiver may be collectively referred to herein as a transceiver.

In a seventh aspect, a processor is provided, including: input circuit, output circuit and processing circuit. The processing circuitry is configured to receive signals via the input circuitry and to transmit signals via the output circuitry, such that the method of the first aspect and any possible implementation of the first aspect is implemented.

In a specific implementation process, the processor may be a chip, the input circuit may be an input pin, the output circuit may be an output pin, and the processing circuit may be a transistor, a gate circuit, a flip-flop, various logic circuits, and the like. The input signal received by the input circuit may be received and input by, for example, but not limited to, a receiver, the signal output by the output circuit may be, for example, but not limited to, output to and transmitted by a transmitter, and the input circuit and the output circuit may be the same circuit that functions as the input circuit and the output circuit, respectively, at different times.

In an eighth aspect, a processor is provided, comprising: input circuit, output circuit and processing circuit. The processing circuit is configured to receive signals via the input circuit and transmit signals via the output circuit, such that the method of the second aspect is implemented as well as any one of the possible implementations of the second aspect.

In a specific implementation process, the processor may be a chip, the input circuit may be an input pin, the output circuit may be an output pin, and the processing circuit may be a transistor, a gate circuit, a flip-flop, various logic circuits, and the like. The input signal received by the input circuit may be received and input by, for example and without limitation, a receiver, the signal output by the output circuit may be output to and transmitted by a transmitter, for example and without limitation, and the input circuit and the output circuit may be the same circuit that functions as the input circuit and the output circuit, respectively, at different times.

In a ninth aspect, there is provided a computer readable storage medium storing a computer program or instructions for implementing the method of the first aspect and any one of the possible implementations of the first aspect.

A tenth aspect provides a computer-readable storage medium storing a computer program or instructions for implementing the method of the second aspect and any one of the possible implementations of the second aspect.

The terminal device in the present application may be a Road Side Unit (RSU), a mobile phone, a vehicle terminal, or the like.

The method and the device can be applied to an NR V2X system, an LTE V2X system, a D2D system and the like.

Drawings

Fig. 1 is a schematic diagram of a typical scenario for V2X communication.

Fig. 2 is a schematic diagram of an SL communication scenario for an NR V2X system.

Fig. 3 is a diagram illustrating candidate resources in a slot.

Fig. 4 is a schematic diagram of a specific resource selection process.

Fig. 5 is a schematic diagram of a scenario of a hidden terminal.

Fig. 6 is a schematic diagram of a scene exposing a terminal.

FIG. 7 is a schematic flow chart diagram of a method for resource selection according to one embodiment of the present application.

Fig. 8 is a diagram illustrating auxiliary resource information according to an embodiment of the present application.

FIG. 9 is a schematic flow chart diagram of a method for resource selection in another embodiment of the present application.

Fig. 10 is a schematic diagram of a RSRP information determination process according to an embodiment of the present application.

Fig. 11 is a diagram of time information of a secondary resource selection window.

Fig. 12 is a diagram of determining RSRP information of a first candidate resource in one embodiment of the present application.

Fig. 13 is a schematic block diagram of a terminal apparatus according to an embodiment of the present application.

Fig. 14 is a schematic block diagram of a terminal apparatus according to another embodiment of the present application.

Fig. 15 is a schematic block diagram of a terminal apparatus according to still another embodiment of the present application.

Fig. 16 is a schematic block diagram of a terminal apparatus according to still another embodiment of the present application.

Fig. 17 is a schematic block diagram of a terminal apparatus according to still another embodiment of the present application.

Detailed Description

The technical solution in the present application will be described below with reference to the accompanying drawings.

Wireless communication technology has experienced rapid development over the past several decades, and has successively experienced the first generation (1st generation, 1g) wireless communication system based on analog communication system, the 2G (2 nd generation) wireless communication system typified by global system for mobile communication (GSM), the 3G (3 rd generation) wireless communication system typified by Wideband Code Division Multiple Access (WCDMA), and further the Long Term Evolution (LTE) communication system, i.e., the 4G (4 th generation) wireless communication system, which is now widely used and has been largely successful all over the world. Services supported by wireless communication systems have also evolved from originally supporting only voice and short messages to now supporting wireless high-speed data communications. At the same time, the number of wireless connections worldwide is also experiencing a continuously high rate of growth. The emergence of a variety of new wireless service types, such as IoT, autonomous driving, etc., has placed higher demands on the next generation wireless communication system, i.e., the NR communication system, i.e., the 5G communication system.

From 4G systems, V2X communication and D2D communication are beginning to receive widespread attention in the industry. V2X communication refers to communication of the vehicle with anything outside, including vehicle-to-vehicle V2V communication, vehicle-to-pedestrian V2P communication, vehicle-to-infrastructure V2I communication, vehicle-to-network V2N communication, etc., as shown in fig. 1. The vehicle can acquire surrounding road condition information in real time through communication with other vehicles, pedestrians, infrastructure and network facilities, so that the vehicle driving is better assisted and even automatic driving is realized.

The V2X communication is a basic technology and a key technology applied in a scene with high requirements for communication delay and reliability in the future, for example, in a scene of an intelligent automobile, intelligent driving, automatic driving, an intelligent transportation system, and the like, for a high-speed device represented by a vehicle. On the basis of the LTE network, the third generation partnership project (3 gpp) proposes LTE V2X, which preliminarily supports basic V2X communication requirements. The 3GPP standards organization formally promulgates the first generation LTE V2X standard, LTE Release 14 in the early 2017. Although LTE V2X addresses some basic requirements in V2X scenarios, LTE V2X at present cannot be effectively supported for future application scenarios such as fully intelligent driving and autonomous driving. Because these new application scenarios have more stringent requirements on V2X communication capabilities, such as higher transmission rate, lower transmission delay, and higher transmission reliability. With the development of the NR technology of 5G in the 3GPP standard organization, NR V2X will be further developed, in order to support more advanced service scenarios, such as formation driving, cooperative sensing, remote driving, etc., V2X communication under the NR system is proposed to support lower transmission delay (e.g., transmission delay as low as 20 ms), more reliable communication transmission (e.g., reliability as high as 99.999%), higher throughput (e.g., throughput as high as 1 Gbps), and better user experience compared to the 4G system, so as to meet the requirements of more extensive application scenarios.

V2X communication and D2D communication under the NR system may select data transmission through SL. The method and the device can be mainly applied to SL communication scenes of NR V2X systems. Fig. 2 is a schematic diagram of an SL communication scenario for an NR V2X system. Fig. 2 shows 3 transmitting UEs and 2 receiving UEs, in this example both being vehicles. The sending UE is an entity which sends data information and receives measurement feedback information; the receiving UE is an entity that receives data information and transmits measurement feedback information. The transmitting UE1 and the transmitting UE2 transmit data to the receiving UE1, and the transmitting UE3 transmits data to the receiving UE 2. It should be understood that in actual SL communication, more or fewer UEs may communicate with each other, and fig. 2 is only a schematic illustration of a SL communication scenario and is not a limitation of the present application. The present application may also be used in SL communication scenarios in other communication systems (e.g., LTE V2X systems or D2D systems).

The technical solution of the present application can be applied to various communication systems, for example: a global system for mobile communications (GSM) system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) system, a General Packet Radio Service (GPRS), an LTE system, an LTE Frequency Division Duplex (FDD) system, an LTE Time Division Duplex (TDD), a Universal Mobile Telecommunications System (UMTS), a Worldwide Interoperability for Microwave Access (WiMAX) communication system, a 5G system, or an NR system.

A terminal device in this application may refer to a User Equipment (UE), a terminal device, an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user device. The terminal device may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a 5G network or a terminal device in a Public Land Mobile Network (PLMN) for future evolution, and the like, for example, a Road Side Unit (RSU), a mobile phone, a vehicle terminal, and the like, which are not limited in this application. For convenience, the terminal device is taken as a vehicle terminal for example to illustrate.

The resource allocation for SL transmission has two modes: one is a base station assigned resource mode (mode-1), and the other is a terminal apparatus (e.g., UE) self-selected resource mode (mode-2). The base station resource allocation mode (mode-1) is mainly applied to V2X communication under the condition of network coverage, and the base station performs resource allocation uniformly according to a Buffer Status Report (BSR) of UE. In the UE-autonomous resource mode (mode-2), the transmission resources for transmitting the UE are not dependent on the base station. Of course, mode-2 is not limited to network coverage, and a transmitting UE may communicate in mode-2 without network coverage. The present application relates generally to resource sensing and resource selection (selection) in the mode-2 scenario in NR V2X.

And under mode-2, the sending UE automatically selects transmission resources from the resource pool for communication in the resource selection window according to the result of resource perception. A Resource Pool (RP) referred to in this application is a set of time-frequency resources for SL transmission (transmission or reception). From the UE perspective, the time domain resource of the resource pool may be some discontinuous time slots or symbols; the frequency domain resource of the resource pool may be a portion of contiguous subchannels, or Physical Resource Blocks (PRBs), or subcarriers within the user bandwidth. Each UE may configure multiple resource pools. In an example, it is assumed that the number of sub-channels occupied by a physical sidelink shared channel (psch) and/or a Physical Sidelink Control Channel (PSCCH) corresponding to data to be transmitted by a UE is transmitted is L _subCH Then each candidate resource for psch and/or PSCCH transmission is a set of length L _subCH The successive sub-channels of (a). Fig. 3 is a diagram of candidate resources in one slot (slot). As shown in fig. 3, the number N of sub-channels (sub-channels) of the frequency domain resource pool in one time slot _subCH Is 8, and the serial number is 0 to 7. The number L of sub-channels occupied by PSSCH and/or PSCCH corresponding to data to be transmitted _subCH 2, the total number of candidate resources in a time slot is N _subCH -L _subCH +1=7. The set of candidate resources is denoted as C = { C ₀ ,C ₁ ,C ₂ ,C ₃ ,C ₄ ,C ₅ ,C ₆ H, wherein the candidate resource C ₀ Including subchannel 0 and subchannel 1, candidate resource C ₁ Including subchannel 1 and subchannel 2, \8230candidateresource C ₆ Including subchannel 6 and subchannel 7. The total candidate resources corresponding to the resource selection window is the sum of the candidate resources on all time slots in the resource selection window.

Assuming that the sending UE triggers resource selection at time slot n, a resource sensing window may be defined before resource selection triggering[n-T0,n-T _proc,0 ]The corresponding time slot. The resource selection window may be defined as [ n + T1, n + T2] after the resource selection trigger]The corresponding time slot. Fig. 4 is a schematic diagram of a specific resource selection process. As shown in fig. 4, the resource selection process includes the following steps.

1. Initialization: assume a candidate resource set S _A Selecting a set of all candidate resources in the window for the resource, the total number of candidate resources being M _total 。

2. And the sending UE senses Sidelink Control Information (SCI) sent by other UEs in the corresponding frequency domain resource pool in the resource sensing window. Generally, in SL transmission, the UE transmits SCI at the same time as data transmission, and the SCI generally includes information of a reserved resource for performing next data transmission.

3. If the SCI sensed by the transmitting UE comprises the information of the reserved resources of other UEs and the reserved resources are positioned in a resource selection window [ n + T1, n + T2]]And if so, the UE is sent to measure a Reference Signal Receiving Power (RSRP) value of the candidate resource corresponding to the reserved resource, wherein the RSRP value comprises the PSSCH-RSRP value and/or the PSCCH-RSRP value. A Reference Signal (RS) is a "pilot" signal, which is a known signal provided by a transmitting end (e.g., a transmitting UE) to a receiving end (e.g., a receiving UE) for channel estimation or channel sounding. The RS is typically transmitted along with the data signal. If the measured RSRP value is higher than the preset RSRP threshold Th _RSRP From the candidate resource set S _A Excluding the corresponding candidate resource. The preset RSRP threshold Th _RSRP As a function of the priority corresponding to the next transmitted data indicated in the received SCI and the priority corresponding to the data to be sent that sent the UE. The above operations are performed for UE1 to UE3, respectively, to exclude the corresponding candidate resources.

4. If the candidate resource set S _A Less than 0.2 m candidate resources remaining in the resource pool _total Then the RSRP threshold Th is set _RSRP Raised by 3dB and then returned to step 1 to start over.

5. Sending UE in candidate resource set S _A To select one of the remaining candidate resources for data transmission.

In the existing scheme of selecting a resource mode (mode-2) by user equipment, a sending UE selects resources for sending data only according to its own perception (sensing) of the resources, and there are problems of "hidden terminals" and "exposed terminals", and the selected resources are likely not to meet transmission requirements.

Fig. 5 is a schematic diagram of a scenario of a hidden terminal. In fig. 5, UE a is transmitting a signal to UE B. When UE C wants to send a signal to UE B, UE C does not sense that UE a also sends a signal to UE B, so UE a and UE C send signals to UE B at the same time, causing signal collision. This situation is known as the "hidden terminal" problem.

Fig. 6 is a schematic diagram of a scene exposing a terminal. In fig. 6, UE B is transmitting to UE a and UE C wants to transmit to UE D, but UE C is in the coverage of UE B (transmitting UE) but out of the coverage of UE a (receiving UE), and UE C may delay transmission by listening to UE B's transmission signal. In fact, UE C and UE D may be out of coverage of UE a, and UE C and UE D communication will not affect data reception of UE a. This is known as the "exposed termination" problem.

To address the above-mentioned "hidden terminal" and "exposed terminal" issues, the present application provides a method for resource selection that allows a receiving terminal device (e.g., a receiving UE) to assist a transmitting terminal device (e.g., a transmitting UE) in perceiving resources in a mode-2 scenario.

The embodiment of the application provides a method for auxiliary resource selection triggered by sending UE. FIG. 7 is a schematic flow chart diagram of a method 700 for resource selection in one embodiment of the present application. As shown in fig. 7, a method 700 for resource selection may include the following steps.

S710, the transmitting UE has data to send.

S720, when the sending UE detects that the data to be sent arrives, the sending UE sends a trigger message to the receiving UE. The trigger message indicates the receiving UE to help send the UE sensing resources, and includes information about the size of data to be sent (e.g., the number of sub-channels occupied by PSCCH and/or PSCCH corresponding to the data to be sent) in the sending UE and the priority of the data to be sent. Optionally, time information of the secondary resource selection window may be included in the trigger message to indicate that the receiving UE performs resource sensing and selection in the specified secondary resource selection window.

And S730, after the receiving UE receives the trigger information, obtaining the size of the data to be sent and the priority of the data to be sent of the sending UE. And carrying out resource perception according to the information to obtain auxiliary resource information. Fig. 8 is a diagram illustrating auxiliary resource information according to an embodiment of the present application. As shown in fig. 8, it is assumed that the size of data to be transmitted of a transmitting UE needs to occupy 3 subchannels in a frequency domain, and after resource selection of a receiving UE, three candidate resources (shaded portions in the figure) remain, where each candidate resource includes three continuous subchannels in one time slot.

S740, the receiving UE feeds back the auxiliary resource information to the sending UE. The auxiliary resource information includes time-frequency domain information of three candidate resources. If the sending UE does not indicate the time information of the auxiliary resource selection window to the receiving UE in the trigger message, the receiving UE may feed back the time information of the auxiliary resource selection window together to the sending UE in the auxiliary resource information; if the sending UE indicates the time information of the secondary resource selection window to the receiving UE in the trigger message, the receiving UE may not feed back the time information of the secondary resource selection window in the secondary resource information. Of course, in any case, the receiving UE may feed back the time information of the auxiliary resource selection window to the sending UE, or may not feed back the time information of the auxiliary resource selection window to the sending UE, which is not limited in this embodiment of the present application.

And S750, the sending UE selects proper candidate resources as sending resources according to the resource interception information sensed by the sending UE and the auxiliary resource information fed back by the receiving UE. The resource listening information may be a bitmap for indicating self-perceived candidate resources; the secondary resource information may be a bitmap for indicating candidate resources for receiving UE feedback. Optionally, selecting a suitable candidate resource as a sending resource may be to take a resource in an intersection of the candidate resource in the sending UE according to the resource listening information sensed by the sending UE and the auxiliary resource information fed back by the receiving UE, or may be to select a resource in which the sending UE and the receiving UE are integrated, which is not limited in the embodiment of the present application.

The transmitting UE transmits data (e.g., psch and/or PSCCH) on the selected candidate resources (also referred to as transmission resources) S760.

In the method 700 for assisting resource selection triggered by a sending UE, the sending UE needs to send a trigger message to a receiving UE before sending data. The candidate resource that the receiving UE selects last for resource awareness is related (tied) to the size and priority of the data to be sent by the sending UE. And the receiving UE senses and selects resources based on the size and the priority of the data to be sent and feeds back the screened candidate resources to the sending UE. The information exchange flow causes the signaling overhead of the system and the time delay of data transmission to be larger. In addition, the candidate resource selected by the receiving UE after the resource sensing is bound to the size and priority of the data to be sent by the sending UE, and only one sending UE can be assisted to select the resource, but not used for other UEs. If there are multiple transmitting UEs to transmit data to a receiving UE, each transmitting UE triggers a process for receiving UE-assisted resource selection. The receiving UE needs to sense and select the resources for multiple times, and the result of each selection is only suitable for one sending UE. Therefore, the utilization of information measured in resource sensing and selection by the receiving UE is low.

The embodiment of the application provides a method for resource selection. FIG. 9 is a schematic flow chart diagram of a method 900 for resource selection according to another embodiment of the present application. The first terminal device may be a receiving device in data transmission, for example, a receiving UE, and the second terminal device may be a transmitting device in data transmission, for example, a transmitting UE. The method 900 may include the following steps.

S910, the first terminal device determines RSRP information of the secondary candidate resource in the secondary resource selection window, where the RSRP information is based on an RSRP value of the secondary candidate resource and is used to indicate an available condition of the secondary candidate resource.

S920, the first terminal device sends first indication information to the second terminal device, where the first indication information includes RSRP information of the auxiliary candidate resource, and the first indication information is used to assist the second terminal device to select a transmission resource to send data to be sent. Correspondingly, the second terminal device receives the first indication information sent by the first terminal device.

S930, the second terminal device selects a transmission resource according to the size, priority and the first indication information of the data to be transmitted.

According to the method for selecting the resources, the receiving device assists the sending device in selecting the resources, and the possibility that the selected resources meet the transmission requirement can be improved. The method comprises the steps that a first terminal device serving as a receiving device determines RSRP information of auxiliary candidate resources, first indication information comprising the RSRP information is sent to a second terminal device serving as a sending device, the second terminal device selects the sending resources, and the first indication information is unbound with the size and priority of data to be sent by the sending device, so that the RSRP information can be repeatedly utilized at different sending devices, the utilization rate of the RSRP information can be improved, the measurement burden of the first terminal device is reduced, and the efficiency of auxiliary resource selection is improved.

Optionally, before the first terminal device determines RSRP information of the secondary candidate resource within the secondary resource selection window, the method 900 may further comprise: the first terminal device determines a secondary resource awareness window and a secondary resource selection window.

In some embodiments of the present application, the secondary resource selection window may be indicated by the second terminal device as the transmitting device to the first terminal device as the receiving device, and then the secondary resource awareness window is determined by the first terminal device from the secondary resource selection window. And then the first terminal device can obtain the RSRP information of the auxiliary candidate resources in the auxiliary resource selection window through measurement and send the first indication information to the second terminal device. When the second terminal device has data to be transmitted, the first indication information can be used to assist in selecting transmission resources.

In further embodiments of the present application, the first terminal device determining RSRP information and sending the first indication information may be performed periodically. That is, the method of the embodiment of the present application is executed at regular time intervals. The scheme does not require the transmitting device to send a trigger message to trigger the first terminal device to perform assisted resource sensing and selection. When the second terminal device has data to be transmitted, the first indication information of the first terminal device can be directly used for assisting in selecting transmission resources. The triggered information interaction flow is not needed, and the signaling overhead of the system and the time delay of data transmission can be reduced.

In still other embodiments of the present application, the first terminal device may determine RSRP information and send the first indication information when there is data to send. That is, when the first terminal device has data to send, the method of the embodiment of the present application is actively executed. This scheme does not require the transmitting device (second terminal device) to send a trigger message to trigger the first terminal device to assisted resource sensing and selection. When the second terminal device has data to be transmitted, the first indication information of the first terminal device can be directly used to select transmission resources. The triggered information interaction process is not needed, and the signaling overhead of the system and the time delay of data transmission can be reduced.

In these embodiments, the first terminal device may transmit the first indication information with data of the first terminal device after determining the first indication information. In other words, the first indication information is sent with the data. This can save the process of the first terminal device listening for and requesting resources for transmitting the first indication information, can reduce the burden on the first terminal device, and can save signaling and resource overhead. Of course, the first indication information may also be transmitted using other resources instead of being transmitted with the data, for example, using the resource that is intercepted and requested by the first terminal device, which is not limited in this embodiment of the present application.

In other embodiments of the present application, the process of determining RSRP information and sending the first indication information by the first terminal device may also be triggered by other actions or instructions, which is not limited in this embodiment of the present application.

The RSRP information of the embodiments of the present application is used to indicate the availability of the auxiliary candidate resources. The RSRP information may comprise an RSRP value or a resource availability level value, wherein the RSRP value is negatively correlated to the availability of the auxiliary candidate resources and the resource availability level value is positively correlated to the availability of the auxiliary candidate resources. The embodiment of the application is not limited to the specific form of the RSRP information, so that the RSRP information is more flexibly expressed.

The RSRP information may be an RSRP value (e.g., a quantized RSRP value) or may be a resource availability level value. The RSRP value represents the magnitude of the reference signal received power on the secondary candidate resource. The smaller the RSRP value, the higher the secondary candidate resource availability. The resource availability level value is used in the same way as the RSRP value, but in a different sense. A larger value of the resource availability rating indicates a higher availability of the secondary candidate resource, as opposed to an RSRP value. In the embodiment of the application, the resource available level value may be determined according to an RSRP value.

In general, if a receiving UE needs to assist in transmitting UE-aware resources, the receiving UE needs to know the size of data to be transmitted by the transmitting UE. In the scheme based on the trigger of the sending UE described above, the information of the size of the data to be sent is indicated to the receiving UE through the trigger message. However, in the non-transmitting UE trigger based scheme, the receiving UE does not know the size of the data to be transmitted by the transmitting UE. At this time, the receiving UE may perform resource sensing at a preset resource granularity. For the first terminal device, the size of the secondary candidate resource in the frequency domain may be determined according to the configuration information of the resource pool, or may be a factory configuration parameter of the first terminal device, or may be a sub-channel. For the second terminal device, the size of the auxiliary candidate resource in the frequency domain may be determined according to the configuration information of the resource pool, or may be a factory configuration parameter of the second terminal device, or may be one sub-channel. The size of the auxiliary candidate resource in the frequency domain may be specified by a protocol, or determined by negotiation between terminal devices communicating with each other, or determined by a manufacturer, or set as a fixed value, which is not limited in this embodiment of the application.

The size of the auxiliary candidate resource in the frequency domain according to the embodiment of the present application may be a subchannel, a PRB, or a subcarrier. PRB granularity is larger, and the quantity is smaller; the subcarrier has smaller granularity and more quantity. Therefore, in the embodiments of the present application, the size of the auxiliary candidate resource in the frequency domain is preferably a subchannel, and the embodiments of the present application are also described by taking this as an example. Correspondingly, the size of the data to be transmitted in the present application may be the number of subchannels occupied by the PSCCH and/or PSCCH corresponding to the data to be transmitted, but the embodiments of the present application are not limited thereto.

The size of the auxiliary candidate resource in the time domain according to the embodiment of the present application may be a time slot or a symbol. The symbol granularity is small, and the number is large, so in the embodiments of the present application, the size of the auxiliary candidate resource in the time domain is preferably a time slot, and the embodiments of the present application are also described by taking this as an example, but the embodiments of the present application are not limited thereto.

Alternatively, the secondary candidate resource may be a resource of minimum granularity of resource allocation.

In some embodiments of the present application, when the first terminal device transmits the first indication information to the second terminal device in S920, the first indication information may be carried by a Control Element (CE), namely, a MAC CE, of a Media Access Control (MAC) layer. MAC CEs are typically located above the physical layer. The first indication information may also be carried by the sidelink SCI. The sidelink SCI is typically located at the physical layer. The first indication information may also be carried by a higher layer signaling, for example, radio Resource Control (RRC) signaling, which is not limited in this embodiment of the present application.

In some embodiments of the present application, S910 determining RSRP information of the secondary candidate resource within the secondary resource selection window by the first terminal device may include: and the first terminal device determines the RSRP information of the corresponding auxiliary candidate resource in the auxiliary resource selection window according to the RSRP value of the received signal measured in the auxiliary resource sensing window.

The resources in the secondary resource selection window are transmission resources that may be used at a future time, and no signal is currently transmitted on the transmission resources, so that the RSRP values of the resources in the secondary resource selection window cannot be directly measured. In the embodiment of the present application, the RSRP value of the resource in the secondary resource selection window is obtained by measuring a signal in the secondary resource sensing window. I.e. the result of the secondary resource-aware window measurement can be used as an approximate result of the RSRP of the resources in the secondary resource selection window. The first terminal device measures an RSRP value of a received signal on at least one secondary candidate resource in a secondary resource sensing window, and uses the RSRP value as an RSRP value of a corresponding secondary candidate resource in a secondary resource selection window, or determines a resource available rank value of a secondary candidate resource in the secondary resource selection window according to the RSRP value.

In a specific embodiment, the determining, by the first terminal device, RSRP information of a corresponding secondary candidate resource within the secondary resource selection window according to an RSRP value of a received signal measured within the secondary resource sensing window may include: when the first terminal device includes resource reservation information in a sidelink SCI on a PSCCH received in an auxiliary resource sensing window and a reserved resource indicated by the resource reservation information is located in an auxiliary resource selection window, the first terminal device determines RSRP information of an auxiliary candidate resource corresponding to the reserved resource in an auxiliary resource selection window according to an RSRP value of the PSCCH or an RSRP value of a physical sidelink shared channel PSSCH associated with the PSCCH. The RSRP information of the auxiliary candidate resources obtained in the mode is closer to the RSRP real situation of the auxiliary candidate resources in the auxiliary resource selection window.

In a specific example, the first terminal device receives the PSCCH within the secondary resource-aware window and measures an RSRP value of the PSCCH; when the resource reservation information is included in the sidelink SCI of the PSCCH and the reserved resource indicated by the resource reservation information is located in the auxiliary resource selection window, the first terminal device determines RSRP information of a corresponding reserved candidate resource in the auxiliary resource selection window according to the RSRP value of the PSCCH. It will be appreciated that the first terminal device, when receiving the PSCCH, does not know whether the resource reservation information is included in the sidelink SCI of the PSCCH and therefore measures the RSRP value whilst receiving each PSCCH.

In another specific example, the first terminal device receives the PSCCH within the secondary resource-aware window; when the resource reservation information is included in the sidelink SCI of the PSCCH and a reserved resource indicated by the resource reservation information is located within the secondary resource selection window, the first terminal device measures an RSRP value of the PSCCH associated with the PSCCH. Then, the first terminal device determines RSRP information of a secondary candidate resource corresponding to the reserved resource in the secondary resource selection window, based on an RSRP value of the psch associated with the PSCCH.

It should be understood that the two specific examples described above may be performed simultaneously. The finally determined RSRP information of the secondary candidate resource in the secondary resource selection window may be calculated according to the RSRP values obtained in the two examples. For example, the RSRP value of the auxiliary candidate resource in the auxiliary resource selection window may be obtained by taking a smaller value, a larger value, a weighted average value, or the like for the RSRP values obtained in the two examples; or the resource available rank value of the auxiliary candidate resource in the auxiliary resource selection window is obtained through more complex calculation, which is not limited in the embodiment of the present application.

The following describes a process of determining RSRP information with a specific example of determining RSRP values of secondary candidate resources in conjunction with the accompanying drawings. If the first terminal device obtains SCI by decoding PSCCH of other terminal devices except the second terminal device in the auxiliary resource sensing window, the SCI comprises resources which are reserved by the other terminal devices, and the reserved resources are located in the auxiliary resource selection window [ n + T1, n + T2], the first terminal device measures RSRP values of PSSCH and/or PSCCH of the other terminal devices to obtain PSSCH-RSRP measurement values or PSCCH-RSRP measurement values. The first terminal device uses the psch-RSRP measurement value or the PSCCH-RSRP measurement value as an RSRP value of a reserved resource of the other terminal device, that is, an RSRP value of a secondary candidate resource of the secondary resource selection window. Fig. 10 is a schematic diagram of a RSRP information determination process according to an embodiment of the present application. As shown in fig. 10, the first terminal device decodes the PSCCH of UE1, UE2 and UE3 in the secondary resource sensing window, knows that the size of the PSCCH and/or PSCCH transmitted by UE1 is 2 subchannels, and that the reserved resource for the next transmission is located in 2 secondary candidate resources numbered 6 and 7 in the secondary resource selection window, and at this time, the first terminal device can measure the psch-RSRP and/or PSCCH-RSRP of UE1 as the RSRP values of the secondary candidate resources 6 and 7, that is, RSRP 6 and RSRP 7 are both equal to the psch-RSRP or PSCCH-RSRP of UE 1. Similar operations are performed for UE2 and UE3, resulting in RSRP14, RSRP16, RSRP17, and RSRP18.

Optionally, the determining, by the first terminal device, RSRP information of the secondary candidate resource corresponding to the reserved resource in the secondary resource selection window according to an RSRP value of the PSCCH or an RSRP value of a physical uplink shared channel psch associated with the PSCCH, may include: and the first terminal device determines the RSRP information of the auxiliary candidate resource corresponding to the reserved resource in the auxiliary resource selection window according to the RSRP value of the PSCCH or the PSSCH and the priority of the data corresponding to the reserved resource. The RSRP information may be a function of an RSRP value of the PSCCH or PSCCH and a priority of data corresponding to the reserved resource.

In a specific example, when the priority of the data corresponding to the reserved resource is higher, the first terminal device may set the RSRP value of the secondary candidate resource corresponding to the reserved resource in the secondary resource selection window to be higher than the RSRP value of the PSCCH or PSCCH, for example, the RSRP value of the PSCCH or PSCCH plus a positive RSRP increase value (for example, 3 dBm), so as to reduce the availability of the secondary candidate resource, so that the terminal device reserving the resource is more easily allocated to the resource. Alternatively, the first terminal device may set the resource availability level value of the secondary candidate resource corresponding to the reserved resource in the secondary resource selection window to be lower than the resource availability level value calculated from the RSRP value of the PSCCH or PSCCH. The RSRP information of the auxiliary candidate resources is determined by considering the priority of the data corresponding to the reserved resources, and the reasonability of resource selection can be improved.

In some embodiments of the present application, when the RSRP information comprises an RSRP value, the first terminal device determines RSRP information of secondary candidate resources within the secondary resource selection window, further comprising: the first terminal device determines the RSRP value of the auxiliary candidate resource which is not reserved in the auxiliary resource selection window as the minimum value of a value range; the first terminal device determines the RSRP value of the auxiliary candidate resource which cannot be used in the auxiliary resource selection window as the maximum value of the value range; or, when the RSRP information includes the resource availability level value, the first terminal device determines RSRP information of the secondary candidate resource within the secondary resource selection window, further including: the first terminal device determines the resource available grade value of the auxiliary candidate resource which is not reserved in the auxiliary resource selection window as the maximum value of the value range; the first terminal device determines the resource availability rating value of the auxiliary candidate resource which is not available in the auxiliary resource selection window as the minimum value of the value range.

In a specific example, the RSRP information is an RSRP value. If certain secondary candidate resources within the secondary resource selection window are not reserved, their RSRP value may be set to a minimum value within a range of RSRP values, e.g., — ∞.

In another specific example, the terminal device operates based on half duplex and cannot simultaneously transmit and receive data. If the first terminal device reserves a transmission resource in the auxiliary resource selection window, all the auxiliary candidate resources in the time slot occupied by the reserved resource are unusable auxiliary candidate resources. Then the RSRP values of these auxiliary candidate resources may be set to a maximum value within a range of RSRP values, e.g., + ∞.

In yet another specific example, the RSRP information is a resource availability level value. If some of the secondary candidate resources within the secondary resource selection window are not reserved, their resource availability rating value may be set to a maximum value within a range of values of resource availability rating values, such as + ∞.

In yet another specific example, the terminal device is based on half-duplex operation and is not capable of transmitting and receiving data simultaneously. If the first terminal device reserves a transmission resource in the auxiliary resource selection window, all the auxiliary candidate resources in the time slot occupied by the reserved resource are unusable auxiliary candidate resources. The resource availability level values for these secondary candidate resources may be set to a minimum value within a range of resource availability level values, such as- ∞.

In some embodiments of the present application, the RSRP information may be a quantized value of the RSRP value. That is, the first terminal device may quantize the RSRP value, and form RSRP information from the quantized value to send to the second terminal device. The measured RSRP value is a continuous value in a time period corresponding to the resource for transmitting the psch and/or PSCCH, and the continuous value can be converted into a point value for convenient use by quantizing the RSRP value.

Illustratively, table 1 is a mapping between quantized values and measured RSRP values. The first terminal device may quantize the RSRP value of the auxiliary candidate resource according to table 1 to obtain a quantized value, where the number of quantized bits is 6 bits. After receiving the quantized value, the second terminal device may determine an RSRP value corresponding to the quantized value according to table 1. For example, when the RSRP value is less than-128 decibel-milliwatts (dBm), the quantized value obtained by quantizing the RSRP value is RSRP _0. For another example, when the RSRP value is less than-126 dBm and greater than or equal to-128 dBm, the RSRP value is quantized to obtain a quantized value RSRP _1. The specific mapping relationship can be seen in table 1, which is not listed here. It should be noted that "\8230" in table 1 indicates that as the sequence number of the quantization value increases, the RSRP value also increases correspondingly; for example, RSRP _4 corresponds to-122 ≦ RSRP < -120, then RSRP _5 corresponds to-120 ≦ RSRP < -118.

Table 1: mapping relationship between quantized values and measured RSRP

Quantized value	RSRP value (dBm)
RSRP_0	RSRP<-128
RSRP_1	-128≤RSRP<-126
RSRP_2	-126≤RSRP<-124
RSRP_3	-124≤RSRP<-122
RSRP_4	-122≤RSRP<-120
…	…
RSRP_59	-12≤RSRP<-10
RSRP_60	-10≤RSRP<-8
RSRP_61	-8≤RSRP<-6
RSRP_62	-6≤RSRP<-4
RSRP_63	-4≤RSRP

Illustratively, table 2 is a mapping between resource availability level values and measured RSRP values. The second terminal device receives. After the resource availability rating value, this can be determined according to table 2. The RSRP value corresponding to the resource available level value is not described herein again.

Table 2: mapping relationship between resource availability level value and measured RSRP value

Resource availability rating value	RSRP value (dBm)
63	RSRP<-128
62	-128≤RSRP<-126
61	-126≤RSRP<-124
60	-124≤RSRP<-122
59	-118≤RSRP<-120
…	…

4	-12≤RSRP<-10
3	-10≤RSRP<-8
2	-8≤RSRP<-6
1	-6≤RSRP<-4
0	-4≤RSRP

It should be understood that tables 1 and 2 are only examples, and the value ranges of RSRP values, the number of bits and the value ranges of quantized values, and the number of bits and the value ranges of resource available level values may be adaptively changed. The embodiment of the present application may also select other quantization bit numbers and value ranges based on the existing quantization process, which is not limited in the embodiment of the present application.

In some embodiments of the present application, the first indication information may further include time information of the secondary resource selection window. That is, the first terminal apparatus (e.g., receiving UE) indicates the information [ n + T1, n + T2] of the secondary resource selection window to the second terminal apparatus (e.g., transmitting UE). Fig. 11 is a diagram of time information of a secondary resource selection window. As shown in fig. 11, time m represents the transmission time of the first instruction information. Typically, time m is after the triggering time n for resource sensing (assuming the time at which the first terminal device decides to sense the resource) and before the starting time n + T1 of the secondary resource selection window. Since the two ends of the transceiver are time-synchronized, the time m is known when the second terminal device receives the first indication information sent by the first terminal device.

Accordingly, the time information of the secondary resource selection window may be indicated in at least the following three alternative ways.

1) And indicating a time gap delta = n + T1-m between the transmission time m of the first indication information and the starting time n + T1 of the auxiliary resource selection window and the length L = T2-T1 of the auxiliary resource selection window to the second terminal device.

2) The start time n + T1 of the secondary resource selection window and the length L = T2-T1 of the secondary resource selection window are indicated to the second terminal device.

3) The start time n + T1 of the secondary resource selection window and the end time n + T2 of the secondary resource selection window are indicated to the second terminal device.

The embodiment of the present application is not limited to using the above three ways to indicate the time information of the auxiliary resource selection window, and may also use other indication ways, which are not limited in the embodiment of the present application.

Since the priority of the data to be transmitted of the second terminal device (transmitting UE) is not known, the first terminal device (receiving UE) cannot perform resource exclusion according to RSRP information, i.e., cannot perform resource selection at the receiving UE. Therefore, the first terminal device only determines RSRP information of each auxiliary candidate resource, resource exclusion is not performed according to the RSRP information, the RSRP information is indicated to the second terminal device through the first indication information, and resource selection is performed by the second terminal device according to the size and priority of data to be transmitted and the first indication information. That is, S930 is performed, in which the second terminal device selects transmission resources according to the size of the data to be transmitted, the priority, and the first indication information.

Optionally, the method 900 may further include: s940, the second terminal device transmits data to be transmitted on the transmission resource.

In some embodiments of the present application, S930 where the second terminal device selects the transmission resource according to the size of the data to be transmitted, the priority, and the first indication information, may include: the second terminal device directly selects the transmission resource according to the size, the priority, the resource interception information and the first indication information of the data to be transmitted. Wherein the resource interception information is information indicating the candidate resource, which is obtained by the second terminal device itself through sensing or interception.

In other embodiments of the present application, S930 the second terminal device selecting a transmission resource according to the size, the priority, and the first indication information of the data to be transmitted, where the selecting may include: the second terminal device determines a first candidate resource set according to the size, the priority and the first indication information of the data to be sent; the second terminal device determines the transmission resource based on the first candidate resource set. In a specific example, the determining, by the second terminal device, the first candidate resource set according to the size of the data to be transmitted, the priority, and the first indication information may include: the second terminal device determines the size of a transmission resource for transmitting data to be transmitted in the frequency domain as the size of N auxiliary candidate resources in the frequency domain according to the size of the data to be transmitted, wherein N is an integer greater than zero; and the second terminal device determines a first candidate resource set according to the first indication information, wherein the first candidate resource set comprises M first candidate resources, M is an integer greater than or equal to zero, each first candidate resource comprises N auxiliary candidate resources, RSRP information of the N auxiliary candidate resources included in each first candidate resource meets the requirement of an RSRP threshold, and the RSRP threshold is a function of the priority of the data to be sent.

The following description will take RSRP information of the auxiliary candidate resource as an RSRP value, an RSRP threshold is a threshold for limiting the RSRP value, and the size of the auxiliary candidate resource in the frequency domain is one sub-channel.

When a second terminal device (transmitting UE) has a packet to be transmitted, the second terminal device needs to select a transmission resource. The second terminal device first determines the number N of auxiliary candidate resources of a transmission resource for transmitting data to be transmitted on a frequency domain according to the size of the data to be transmitted, for example, the number N of subchannels occupied by a PSCCH and/or PSCCH corresponding to the data to be transmitted. The number of the auxiliary candidate resources in the transmission resources is equal to the number of the auxiliary candidate resources in the candidate resources.

Fig. 12 is a diagram of determining RSRP information of a first candidate resource in one embodiment of the present application. As shown in fig. 12, the number N of subchannels occupied by the PSCCH and/or PSCCH corresponding to the data to be transmitted is 3, that is, the number of auxiliary candidate resources in the candidate resources is 3. The secondary resource selection window shown in fig. 12 may result in 14 candidate resources. Selecting a first candidate resource set S based on the 14 candidate resources _A 。

In the embodiment of the present application, the RSRP value of each auxiliary candidate resource in each of the 14 candidate resources may be compared with the RSRP threshold Th _RSRP (corresponding RSRP values) are compared as long as at least one of the candidate resources is above a predetermined RSRP threshold Th _RSRP Then the candidate resource is excluded. Finally, the M candidate resources which are not excluded are taken as the first candidate resources to form a first candidate resource set S _A 。

In some further embodiments of the present application, the RSRP value of each candidate resource may be calculated based on the RSRP values of the secondary candidate resources. For example, an average value of RSRP values of N auxiliary candidate resources in each candidate resource may be taken as the RSRP value of the candidate resource, for example, RSRP = (RSRP 1+ RSRP2+ RSRP 3)/3 of a candidate resource formed by 3 auxiliary candidate resources shown in hatching in fig. 12. Alternatively, the maximum value of the RSRP values of the N auxiliary candidate resources in each candidate resource may be used as the RSRP value of the candidate resource. Alternatively, the minimum value of the RSRP values of the N auxiliary candidate resources in each candidate resource may be used as the RSRP value of the candidate resource. Alternatively, a weighted average of RSRP values of N auxiliary candidate resources in each candidate resource may be taken as the RSRP value of the candidate resource, and so on. The RSRP value of each candidate resource may also be calculated by other calculation methods. The method for calculating the RSRP value of the candidate resource is not limited in the embodiment of the application.

The second terminal device calculates the RSRP value of each candidate resource and a preset RSRP threshold Th _RSRP A comparison is made. If the RSRP value of the candidate resource is higher than the preset RSRP threshold Th _RSRP Then the candidate resource is excluded. The remaining M of the last 14 candidate resources are not excluded. The M candidate resources are used as the first candidate resource to form a first candidate resource set S _A 。

It will be appreciated that the above-mentioned predetermined RSRP threshold Th _RSRP May be a function of the priority of the data to be transmitted. In a specific example, the RSRP threshold Th _RSRP A function of the priority corresponding to the data to be sent for the second terminal device and the priority of the data corresponding to the reserved resource indicated in the SCI as described above. The embodiment of the present application does not limit the specific form of the function. It will be appreciated that if the RSRP threshold Th _RSRP Is a threshold for checking RSRP value, the higher the priority of the data to be sent is, the higher the RSRP threshold Th is _RSRP The higher. When the RSRP threshold is too high, the first candidate resource set S is caused to be _A Is less than a certain number of first candidate resources remainingValue (e.g. less than 0.2 m of the preceding text) _total ) The RSRP threshold Th can be raised _RSRP (e.g., a 3dB improvement as described above), the first candidate resource is re-screened. The second terminal device determines the transmission resource based on the first candidate resource set.

The RSRP information of the auxiliary candidate resource is the resource available level value, and the RSRP threshold is a threshold for limiting the resource available level value, which is similar to the principle of the above example and is not described herein again. The description of the case that the size of the auxiliary candidate resource in the frequency domain is other sizes is also omitted.

Optionally, in some embodiments, the second terminal device may further determine a second candidate resource set according to the size of the data to be sent, the priority, and the resource listening information; the determining, by the second terminal device, the transmission resource according to the first candidate resource set may include: the second terminal device determines the transmission resource based on the first candidate resource set and the second candidate resource set.

In a specific example, the second terminal device (sending UE) may determine a sending resource and send data to be sent on the sending resource according to a second candidate resource set (including at least one second candidate resource) determined by the resource listening information sensed by the second terminal device (sending UE) and a first candidate resource set (including M first candidate resources) determined by the first indication information sent by the first terminal device (receiving UE). For example, the second terminal device may select a candidate resource in an intersection of the second candidate resource set sensed by the second terminal device and the first candidate resource set as a transmission resource, so that the selected transmission resource refers to the resource interception information of the transmitting UE and also receives the first indication information provided by the UE, and the probability that the selected result is better is higher. For another example, the second terminal device may also select a transmission resource in a union of the two sets, which is not limited in this embodiment of the present application.

Alternatively, the resource sensing information may be information indicating the second set of candidate resources, e.g. a bitmap indicating second candidate resources in the second set of candidate resources.

It should be understood that in some other embodiments of the present application, the second terminal device may determine the transmission resource directly according to the first indication information without referring to the resource listening information. Correspondingly, the second terminal device may directly select the transmission resource according to the size and the priority of the data to be transmitted and the first indication information, which is not limited in the present application.

Fig. 13 is a schematic block diagram of a terminal device 1300 according to an embodiment of the present application. The terminal apparatus 1300 includes a processing unit 1310 and a transceiving unit 1320. The transceiving unit 1320 can communicate with the outside, and the processing unit 1310 is used for data processing. The transceiving unit 1320 may also be referred to as a communication interface or a communication unit.

Optionally, the terminal device 1300 may further include a storage unit, the storage unit may be used to store instructions or/and data, and the processing unit 1310 may read the instructions or/and data in the storage unit.

The terminal device 1300 may be configured to perform the actions performed by the first terminal device in the above method embodiments.

Wherein the processing unit 1310 is configured to determine reference signal received power, RSRP, information of secondary candidate resources within a secondary resource selection window, the RSRP information being based on RSRP values of the secondary candidate resources and being used to indicate availability of the secondary candidate resources; a transceiving unit 1320, configured to send first indication information to the second terminal device, where the first indication information includes RSRP information of the auxiliary candidate resource, and the first indication information is used to assist the second terminal device to select a transmission resource to send data to be sent.

Optionally, the processing unit 1310 may specifically be configured to: and determining the RSRP information of the corresponding auxiliary candidate resources in the auxiliary resource selection window according to the RSRP value of the received signal measured in the auxiliary resource sensing window.

Optionally, the processing unit 1310 may specifically be configured to: when the side-link control information SCI on the physical side-link control channel PSCCH received in the secondary resource sensing window includes the resource reservation information and the reserved resource indicated by the resource reservation information is located in the secondary resource selection window, the terminal device 1300 determines RSRP information of a secondary candidate resource corresponding to the reserved resource in the secondary resource selection window according to an RSRP value of the PSCCH or according to an RSRP value of a physical side-link shared channel PSCCH associated with the PSCCH.

Optionally, the processing unit 1310 may specifically be configured to: and determining the RSRP information of the auxiliary candidate resource corresponding to the reserved resource in the auxiliary resource selection window according to the RSRP value of the PSCCH or the PSSCH and the priority of the data corresponding to the reserved resource.

Optionally, the RSRP information comprises an RSRP value or a resource availability level value, wherein a magnitude of the RSRP value is negatively related to availability of the auxiliary candidate resource and a magnitude of the resource availability level value is positively related to availability of the auxiliary candidate resource.

Optionally, when the RSRP information includes an RSRP value, the processing unit 1310 may be further configured to: determining the RSRP value of the auxiliary candidate resource which is not reserved in the auxiliary resource selection window as the minimum value of the value range; determining the RSRP value of the auxiliary candidate resource which can not be used in the auxiliary resource selection window as the maximum value of the value range; alternatively, when the RSRP information includes a resource availability level value, processing unit 1310 may be further configured to: determining the resource available grade value of the auxiliary candidate resource which is not reserved in the auxiliary resource selection window as the maximum value of the value range; and determining the resource available grade value of the unavailable auxiliary candidate resource in the auxiliary resource selection window as the minimum value of the value range.

Optionally, the first indication information may further include time information of the secondary resource selection window.

Alternatively, the size of the auxiliary candidate resource in the frequency domain may be determined according to the configuration information of the resource pool, or may be a factory configuration parameter of the first terminal device, or may be one sub-channel.

Fig. 14 is a schematic block diagram of a terminal apparatus 1400 according to another embodiment of the present application. As shown in fig. 14, the terminal apparatus 1400 includes a processor 1410, the processor 1410 is coupled to a memory 1420, the memory 1420 is configured to store computer programs or instructions or/and data, and the processor 1410 is configured to execute the computer programs or instructions and/or data stored by the memory 1420. The terminal device 1400 further comprises a transceiver 1430, the transceiver 1430 being arranged for reception and/or transmission of signals. For example, the processor 1410 is configured to control the transceiver 1430 to receive and/or transmit signals, so that the method in the above method embodiment is performed.

Optionally, the terminal apparatus 1400 includes one or more processors 1410.

Optionally, as shown in fig. 14, the terminal apparatus 1400 may further include a memory 1420.

Optionally, the terminal apparatus 1400 may include one or more memories 1420.

Alternatively, the memory 1420 may be integrated with the processor 1410, or separately provided.

Alternatively, the terminal apparatus 1400 may be configured to implement the operations performed by the first terminal apparatus in the above method embodiments, and may correspond to the units in the above terminal apparatus 1300.

Optionally, the terminal device 1400 is a chip or a chip system. When the terminal apparatus 1400 is a chip or a chip system, the communication interface can be an input/output interface, an interface circuit, an output circuit, an input circuit, a pin or related circuit on the chip or chip system. A processor may also be embodied as a processing circuit or a logic circuit.

Fig. 15 is a schematic block diagram of a terminal apparatus 1500 according to still another embodiment of the present application. The terminal apparatus 1500 includes a processing unit 1510 and a transmitting/receiving unit 1520. The transceiving unit 1520 may communicate with the outside, and the processing unit 1510 is used to perform data processing. The transceiving unit 1520 may also be referred to as a communication interface or a communication unit.

Optionally, the terminal device 1500 may further include a storage unit, and the storage unit may be configured to store instructions or/and data, and the processing unit 1510 may read the instructions or/and data in the storage unit.

The terminal device 1500 may be used to perform the actions performed by the second terminal device in the above method embodiments.

The transceiver 1520 is configured to receive first indication information sent by the first terminal device, where the first indication information includes reference signal received power, RSRP, information of the auxiliary candidate resources, and the RSRP information is based on RSRP values of the auxiliary candidate resources and is used to indicate available conditions of the auxiliary candidate resources, and the first indication information is used to assist the second terminal device to select a transmission resource for transmitting data to be sent; the processing unit 1510 is configured to select a transmission resource according to the size of the data to be transmitted, the priority, and the first indication information.

Optionally, the processing unit 1510 may specifically be configured to: determining a first candidate resource set according to the size, the priority and the first indication information of the data to be sent; and determining the sending resource according to the first candidate resource set.

Optionally, the processing unit 1510 may be further configured to: determining a second candidate resource set according to the size, the priority and the resource interception information of the data to be sent; and determining the sending resources according to the first candidate resource set and the second candidate resource set.

Optionally, the processing unit 1510 may specifically be configured to: determining the size of a transmission resource for transmitting data to be transmitted on a frequency domain as the size of N auxiliary candidate resources on the frequency domain according to the size of the data to be transmitted, wherein N is an integer greater than zero; and determining a first candidate resource set according to the first indication information, wherein the first candidate resource set comprises M first candidate resources, M is an integer greater than or equal to zero, each first candidate resource comprises N auxiliary candidate resources, and RSRP information of the N auxiliary candidate resources included in each first candidate resource meets the requirement of an RSRP threshold, and the RSRP threshold is a function of the priority of data to be sent.

Optionally, the RSRP information includes an RSRP value or a resource availability level value, wherein a size of the RSRP value is negatively related to availability of the auxiliary candidate resource, and a size of the resource availability level value is positively related to availability of the auxiliary candidate resource.

Optionally, the first indication information further includes time information of a secondary resource selection window, and RSRP information of the secondary candidate resources is used to indicate RSRP information of each secondary candidate resource in the secondary resource selection window.

Optionally, the size of the auxiliary candidate resource in the frequency domain is determined according to configuration information of the resource pool, or is a factory configuration parameter of the second terminal device, or is a sub-channel.

Fig. 16 is a schematic block diagram of a terminal apparatus 1600 according to still another embodiment of the present application. As shown in fig. 16, the terminal device 1600 comprises a processor 1610, the processor 1610 is coupled to a memory 1620, the memory 1620 is used for storing computer programs or instructions and/or data, and the processor 1610 is used for executing the computer programs or instructions and/or data stored in the memory 1620. The terminal device 14600 further comprises a transceiver 1630, the transceiver 1630 being used for receiving and/or transmitting signals. For example, the processor 1610 is configured to control the transceiver 1630 to receive and/or transmit signals, so that the method in the above method embodiment is performed.

Optionally, the terminal device 1600 includes one or more processors 1610.

Optionally, as shown in fig. 16, the terminal device 1600 may further include a memory 1620.

Alternatively, the terminal apparatus 1600 may include one or more memories 1620.

Alternatively, the memory 1620 may be integrated with the processor 1610, or may be separately provided.

Alternatively, the terminal device 1600 may be configured to implement the operations performed by the second terminal device in the foregoing method embodiment, and may correspond to the units in the foregoing terminal device 1500.

Optionally, the terminal device 1600 is a chip or a chip system. When the terminal device 1600 is a chip or a system of chips, the communication interface can be an input/output interface, an interface circuit, an output circuit, an input circuit, a pin or related circuit on the chip or the system of chips, etc. A processor may also be embodied as a processing circuit or a logic circuit.

The embodiment of the application also provides a terminal device 1700. The terminal apparatus 1700 may be configured to perform the operations performed by the first terminal apparatus or the second terminal apparatus in the above method embodiments. Fig. 17 shows a simplified schematic diagram of a terminal 1700. For ease of understanding and illustration, in fig. 17, terminal apparatus 1700 is exemplified by a cellular phone. As shown in fig. 17, the terminal device includes a processor, a memory, a radio frequency circuit, an antenna, and an input-output device. The processor is mainly used for processing a communication protocol and communication data, controlling the terminal device, executing a software program, processing data of the software program, and the like. The memory is used primarily for storing software programs and data. The radio frequency circuit is mainly used for converting baseband signals and radio frequency signals and processing the radio frequency signals. The antenna is mainly used for receiving and transmitting radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are used primarily for receiving data input by a user and for outputting data to the user. It should be noted that some kinds of terminal devices may not have an input/output device.

When data needs to be sent, the processor performs baseband processing on the data to be sent and outputs baseband signals to the radio frequency circuit, and the radio frequency circuit performs radio frequency processing on the baseband signals and sends the radio frequency signals to the outside in the form of electromagnetic waves through the antenna. When data is transmitted to the terminal device, the radio frequency circuit receives a radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, and the processor converts the baseband signal into the data and processes the data. For ease of illustration, only one memory and processor are shown in FIG. 17, and one or more processors and one or more memories may be present in an actual end device product. The memory may also be referred to as a storage medium or a storage device, etc. The memory may be provided independently of the processor, or may be integrated with the processor, which is not limited in this embodiment.

In the embodiment of the present application, the antenna and the rf circuit having the transceiving function may be regarded as a transceiving unit of the terminal device, and the processor having the processing function may be regarded as a processing unit of the terminal device.

As shown in fig. 17, the terminal apparatus includes a transceiving unit 1710 and a processing unit 1720. The transceiver unit 1710 may also be referred to as a transceiver, a transceiving device, etc. Processing unit 1720 may also be referred to as a processor, a processing board, a processing module, a processing device, or the like.

Alternatively, a device for implementing a receiving function in the transceiving unit 1710 may be regarded as a receiving unit, and a device for implementing a transmitting function in the transceiving unit 1710 may be regarded as a transmitting unit, that is, the transceiving unit 1710 includes a receiving unit and a transmitting unit. A transceiver unit may also sometimes be referred to as a transceiver, transceiver circuit, or the like. A receiving unit may also be referred to as a receiver, or receiving circuit, etc. A transmitting unit may also sometimes be referred to as a transmitter, or a transmitting circuit, etc.

For example, in one implementation, the transceiving unit 1710 is used for a receiving operation of a first terminal device or a second terminal device. Processing unit 1720 is used to perform processing actions for the first terminal device or the second terminal device.

It should be understood that fig. 17 is merely an example and not a limitation, and the terminal device including the transceiving unit and the processing unit described above may not depend on the structure shown in fig. 17.

When the terminal apparatus 1700 is a chip, the chip includes a transceiver unit and a processing unit. The transceiving unit can be an input/output circuit or a communication interface; the processing unit may be a processor or a microprocessor or an integrated circuit integrated on the chip.

The present application further provides a processor comprising: input circuit, output circuit and processing circuit. The processing circuit is configured to receive the signal via the input circuit and transmit the signal via the output circuit, such that the method in the above method embodiment is implemented, for example, the operations performed by the first terminal device in the above method embodiment or the operations performed by the second terminal device in the above method embodiment may be implemented.

In a specific implementation process, the processor may be a chip, the input circuit may be an input pin, the output circuit may be an output pin, and the processing circuit may be a transistor, a gate circuit, a flip-flop, various logic circuits, and the like. The input signal received by the input circuit may be received and input by, for example and without limitation, a receiver, the signal output by the output circuit may be output to and transmitted by a transmitter, for example and without limitation, and the input circuit and the output circuit may be the same circuit that functions as the input circuit and the output circuit, respectively, at different times.

It will be appreciated that the associated data interaction process, e.g., sending the indication information, may be a process of outputting the indication information from the processor, and receiving the capability information may be a process of receiving the input capability information from the processor. In particular, the data output by the processor may be output to a transmitter and the input data received by the processor may be from a receiver. The transmitter and receiver may be collectively referred to as a transceiver, among others.

The processor may be a chip, and the processor may be implemented by hardware or software, and when implemented by hardware, the processor may be a logic circuit, an integrated circuit, or the like; when implemented in software, the processor may be a general-purpose processor implemented by reading software code stored in a memory, which may be integrated with the processor, located external to the processor, or stand-alone.

It should be understood that the processor mentioned in the embodiment of the present application may include a Central Processing Unit (CPU), a Network Processor (NP), or a combination of the CPU and the NP. The processor may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a Programmable Logic Device (PLD), or a combination thereof. The PLD may be a Complex Programmable Logic Device (CPLD), a field-programmable gate array (FPGA), a General Array Logic (GAL), or any combination thereof.

It should also be understood that the memory referred to in the embodiments of the present application may be a volatile memory (volatile memory) or a non-volatile memory (non-volatile memory), or may include both volatile and non-volatile memory. The nonvolatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), a flash memory (flash memory), a hard disk (HDD), or a solid-state drive (SSD). Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of example, and not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), dynamic random access memory (dynamic RAM, DRAM), synchronous Dynamic Random Access Memory (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchlink DRAM (SLDRAM), and direct rambus RAM (DR RAM).

It should be noted that when the processor is a general-purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, the memory (memory module) is integrated in the processor.

It should be noted that the memory described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

The present application further provides a computer program product comprising: a computer program (which may also be referred to as code, or instructions), which when executed, causes the computer to perform the operations of the first terminal device in the above-described method embodiments.

The present application also provides a computer-readable storage medium storing a computer program (which may also be referred to as code, or instructions) which, when run on a computer, causes the computer to perform the operations of the second terminal device in the above-described method embodiments.

The present application further provides a computer program product comprising: a computer program (which may also be referred to as code, or instructions), which when executed, causes the computer to perform the operations of the first terminal device in the above-described method embodiments.

The present application also provides a computer-readable storage medium storing a computer program (which may also be referred to as code or instructions) which, when executed on a computer, causes the computer to perform the operations of the second terminal device in the above method embodiments.

The present application also provides a communication system including a terminal device corresponding to a first terminal device and a terminal device corresponding to a second terminal device.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

The apparatus provided by the embodiments of the present application may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). 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, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a Digital Video Disk (DVD)), or a semiconductor medium (e.g., an SSD), among others.

It should be understood that the reference herein to first, second, and various numerical designations is merely a convenient division to describe and is not intended to limit the scope of the present application.

It should be understood that the term "and/or" herein is only one kind of association relationship describing the association object, and means that there may be three kinds of relationships, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

It should be understood that, in the embodiment of the present application, the sequence numbers of the above-mentioned processes do not imply an order of execution, and the order of execution of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiment of the present application.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It can be clearly understood by those skilled in the art that, for convenience and simplicity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (29)

1. A method for resource selection, comprising:

   a first terminal device determining reference signal received power, RSRP, information for a secondary candidate resource within a secondary resource selection window, the RSRP information being based on an RSRP value of the secondary candidate resource for indicating availability of the secondary candidate resource;

   the first terminal device sends first indication information to a second terminal device, the first indication information includes the RSRP information of the auxiliary candidate resource, and the first indication information is used for assisting the second terminal device to select a transmission resource to send data to be sent.
2. The method of claim 1, wherein the first terminal device determining RSRP information for secondary candidate resources within a secondary resource selection window comprises:

   and the first terminal device determines the RSRP information of the corresponding auxiliary candidate resource in the auxiliary resource selection window according to the RSRP value of the received signal measured in the auxiliary resource sensing window.
3. The method of claim 2, wherein the first terminal device determining, from the RSRP value of the received signal measured within a secondary resource-aware window, RSRP information of the corresponding secondary candidate resource within the secondary resource selection window comprises:

   when the side-link control information SCI on the physical side-link control channel PSCCH received by the first terminal device in the auxiliary resource sensing window comprises resource reservation information, and a reserved resource indicated by the resource reservation information is located in the auxiliary resource selection window, the first terminal device determines RSRP information of the auxiliary candidate resource corresponding to the reserved resource in the auxiliary resource selection window according to an RSRP value of the PSCCH or an RSRP value of a physical side-link shared channel PSSCH associated with the PSCCH.
4. The method of claim 3, wherein the determining, by the first terminal device, RSRP information of the secondary candidate resource corresponding to the reserved resource in the secondary resource selection window according to an RSRP value of the PSCCH or according to an RSRP value of a physical side uplink shared channel (PSSCH) associated with the PSCCH comprises:

   and the first terminal device determines the RSRP information of the auxiliary candidate resource corresponding to the reserved resource in the auxiliary resource selection window according to the RSRP value of the PSCCH or the PSSCH and the priority of the data corresponding to the reserved resource.
5. The method of any of claims 1-4, wherein the RSRP information comprises RSRP values or resource availability level values, wherein the RSRP values have a magnitude that negatively correlates with the availability of the auxiliary candidate resources and the resource availability level values have a magnitude that positively correlates with the availability of the auxiliary candidate resources.
6. The method of claim 5,

   when the RSRP information includes an RSRP value, the first terminal device determines RSRP information of a secondary candidate resource within a secondary resource selection window, further including: the first terminal device determines the RSRP value of the auxiliary candidate resource which is not reserved in the auxiliary resource selection window as the minimum value of a value range; the first terminal device determines the RSRP value of the auxiliary candidate resource which cannot be used in the auxiliary resource selection window as the maximum value of the value range; or the like, or, alternatively,

   when the RSRP information includes a resource availability rank value, the first terminal device determines RSRP information of a secondary candidate resource within a secondary resource selection window, further comprising: the first terminal device determines the resource available grade value of the auxiliary candidate resource which is not reserved in the auxiliary resource selection window as the maximum value of the value range; and the first terminal device determines the resource available grade value of the auxiliary candidate resource which cannot be used in the auxiliary resource selection window as the minimum value of the value range.
7. The method according to any one of claims 1 to 6, wherein the first indication information further comprises time information of the secondary resource selection window.
8. The method according to any of claims 1 to 7, wherein the size of the secondary candidate resource in the frequency domain is determined according to configuration information of a resource pool, or factory configuration parameters of the first terminal device, or a sub-channel.
9. A method for resource selection, comprising:

   a second terminal device receives first indication information sent by a first terminal device, wherein the first indication information comprises Reference Signal Received Power (RSRP) information of auxiliary candidate resources, the RSRP information is based on RSRP values of the auxiliary candidate resources and used for indicating the availability of the auxiliary candidate resources, and the first indication information is used for assisting the second terminal device to select sending resources used for sending data to be sent;

   and the second terminal device selects the sending resource according to the size and the priority of the data to be sent and the first indication information.
10. The method of claim 9, wherein the selecting, by the second terminal device, the transmission resource according to the size and the priority of the data to be transmitted and the first indication information comprises:

    the second terminal device determines a first candidate resource set according to the size and the priority of the data to be sent and the first indication information;

    the second terminal device determines the transmission resource according to the first candidate resource set.
11. The method of claim 10, further comprising:

    the second terminal device determines a second candidate resource set according to the size, the priority and the resource interception information of the data to be sent;

    the second terminal device determining the transmission resource according to the first candidate resource set, including:

    the second terminal device determines the transmission resource according to the first candidate resource set and the second candidate resource set.
12. The method according to claim 10 or 11, wherein the second terminal device determines a first candidate resource set according to the size of the data to be sent, the priority and the first indication information, comprising:

    the second terminal device determines, according to the size of the data to be transmitted, that the size of a transmission resource for transmitting the data to be transmitted is the size of N auxiliary candidate resources in the frequency domain, where N is an integer greater than zero;

    the second terminal device determines the first candidate resource set according to the first indication information, where the first candidate resource set includes M first candidate resources, M is an integer greater than or equal to zero, each of the first candidate resources includes N auxiliary candidate resources, and RSRP information of the N auxiliary candidate resources included in each of the first candidate resources meets a requirement of an RSRP threshold, where the RSRP threshold is a function of a priority of the data to be sent.
13. The method of any of claims 9 to 12, wherein the RSRP information comprises an RSRP value or a resource availability level value, wherein the RSRP value is negatively related to the availability of the auxiliary candidate resource in magnitude and the resource availability level value is positively related to the availability of the auxiliary candidate resource in magnitude.
14. The method of any of claims 9 to 13, wherein the first indication information further comprises time information of a secondary resource selection window, and wherein the RSRP information of the secondary candidate resources is used to indicate the RSRP information of each secondary candidate resource in the secondary resource selection window.
15. The method according to any of claims 9 to 14, wherein the size of the secondary candidate resource in the frequency domain is determined according to configuration information of a resource pool, or a factory configuration parameter of the second terminal device, or a sub-channel.
16. A terminal device, comprising:

    a processing unit configured to determine reference signal received power, RSRP, information of secondary candidate resources within a secondary resource selection window, the RSRP information being based on RSRP values of the secondary candidate resources and being used to indicate availability of the secondary candidate resources;

    a transceiver unit, configured to send first indication information to a second terminal device, where the first indication information includes the RSRP information of the auxiliary candidate resource, and the first indication information is used to assist the second terminal device to select a transmission resource to send data to be sent.
17. The terminal device according to claim 16, wherein the processing unit is specifically configured to:

    and determining RSRP information of the corresponding auxiliary candidate resources in the auxiliary resource selection window according to the RSRP value of the received signal measured in the auxiliary resource perception window.
18. The terminal device according to claim 17, wherein the processing unit is specifically configured to:

    when the side-link control information SCI on the physical side-link control channel PSCCH received by the terminal device in the auxiliary resource sensing window comprises resource reservation information and the reserved resource indicated by the resource reservation information is located in the auxiliary resource selection window, determining RSRP information of the auxiliary candidate resource corresponding to the reserved resource in the auxiliary resource selection window according to the RSRP value of the PSCCH or the RSRP value of the physical side-link shared channel PSSCH associated with the PSCCH.
19. The terminal device according to claim 18, wherein the processing unit is specifically configured to:

    and determining RSRP information of the auxiliary candidate resource corresponding to the reserved resource in the auxiliary resource selection window according to the RSRP value of the PSCCH or the PSSCH and the priority of the data corresponding to the reserved resource.
20. A terminal device according to any of claims 16 to 19, wherein the RSRP information comprises an RSRP value or a resource availability level value, wherein the magnitude of the RSRP value is negatively related to the availability of the auxiliary candidate resources and the magnitude of the resource availability level value is positively related to the availability of the auxiliary candidate resources.
21. The terminal device according to claim 20,

    when the RSRP information comprises an RSRP value, the processing unit is further to: determining the RSRP value of the auxiliary candidate resource which is not reserved in the auxiliary resource selection window as the minimum value of a value range; determining the RSRP value of the auxiliary candidate resource which can not be used in the auxiliary resource selection window as the maximum value of a value range; or the like, or, alternatively,

    when the RSRP information includes a resource availability rank value, the processing unit is further to: determining the resource available grade value of the auxiliary candidate resource which is not reserved in the auxiliary resource selection window as the maximum value of the value range; and determining the resource available grade value of the unavailable auxiliary candidate resource in the auxiliary resource selection window as the minimum value of the value range.
22. A terminal device, comprising:

    a transceiver unit, configured to receive first indication information sent by a first terminal device, where the first indication information includes reference signal received power, RSRP, information of an auxiliary candidate resource, and the RSRP information is based on an RSRP value of the auxiliary candidate resource and is used to indicate an availability of the auxiliary candidate resource, and the first indication information is used to assist a second terminal device to select a transmission resource for transmitting data to be transmitted;

    and the processing unit is used for selecting the sending resource according to the size and the priority of the data to be sent and the first indication information.
23. The terminal device according to claim 22, wherein the processing unit is specifically configured to:

    determining a first candidate resource set according to the size and the priority of the data to be sent and the first indication information;

    determining the transmission resource according to the first candidate resource set.
24. The terminal device of claim 23, wherein the processing unit is further configured to:

    determining a second candidate resource set according to the size, the priority and the resource interception information of the data to be sent;

    determining the transmission resource according to the first candidate resource set and the second candidate resource set.
25. The terminal device according to claim 23 or 24, wherein the processing unit is specifically configured to:

    determining the size of a transmission resource for transmitting the data to be transmitted in a frequency domain as the size of N auxiliary candidate resources in the frequency domain according to the size of the data to be transmitted, wherein N is an integer greater than zero;

    determining the first candidate resource set according to the first indication information, wherein the first candidate resource set includes M first candidate resources, M is an integer greater than or equal to zero, each of the first candidate resources includes N auxiliary candidate resources, and RSRP information of the N auxiliary candidate resources included in each of the first candidate resources meets a requirement of an RSRP threshold, and the RSRP threshold is a function of a priority of the data to be sent.
26. A terminal device comprising a processor coupled to a memory for storing a computer program or instructions and a memory for executing the computer program or instructions in the memory such that the method of any one of claims 1 to 8 is performed.
27. A terminal device comprising a processor coupled to a memory for storing a computer program or instructions and a memory for executing the computer program or instructions in the memory such that the method of any of claims 9 to 15 is performed.
28. A computer-readable storage medium, characterized in that a computer program or instructions for implementing the method of any one of claims 1 to 8 are stored.
29. A computer-readable storage medium, in which a computer program or instructions for implementing the method of any one of claims 9 to 15 is stored.

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