CN108024230B

CN108024230B - Resource selection method and equipment in V2X communication

Info

Publication number: CN108024230B
Application number: CN201710060123.8A
Authority: CN
Inventors: 张世昌; 李迎阳; 王轶
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Electronics Co Ltd
Priority date: 2016-11-04
Filing date: 2017-01-24
Publication date: 2022-06-14
Anticipated expiration: 2037-01-24
Also published as: CN108024230A

Abstract

The method comprises the steps that UE determines the configuration of one or more sending resource pools of a current working carrier according to pre-configuration or eNB signaling indication, then the UE selects the sending resource pools according to the states of the resource pools and channel detection states, and finally the UE selects sending resources in the sending resource pools according to a corresponding resource selection mode and sends physical signals. By the method, when the load of the resource pool allowing random resource selection is low, the UE can select the resource pool as a sending resource pool and select resources in a random resource selection mode, so that the power loss of the UE is reduced. And when the load of the resource pool is higher, the UE supporting incomplete channel detection can select another resource pool as a sending resource pool, so that the load degree of the resource pool can be reduced. The method can give consideration to both the power loss of the UE and the load control of the resource pool, and can effectively improve the overall performance of the system.

Description

Resource selection method and equipment in V2X communication

Technical Field

The application relates to the technical field of mobile communication, in particular to a resource selection method and equipment in Vehicle-to-outside information exchange V2X (Vehicle to Vehicle/peer/Infrastructure/Network) communication.

Background

Currently, Device to Device (D2D) communication technology has been accepted by 3GPP standards by virtue of its great potential value in the fields of public safety and general civilian communication, and has achieved partial functional standardization in 3GPP Rel-12 and Rel-13. The current 3GPP Rel-12 standard defines two modes of D2D broadcast communication, referred to as Mode 1(Mode 1) and Mode 2(Mode 2).

Where Mode 1 requires that the UE sending D2D broadcast communications must be a UE located under the coverage of the cellular network. The UE acquires configuration information of a Resource pool of a bypass Control CHannel (PSCCH) of Mode 1 by receiving system broadcast signaling sent by the eNB, wherein the configuration information comprises a period of the PSCCH, a subframe position used for PSCCH sending in each period, and a Physical Resource Block (PRB) position used for PSCCH sending in each subframe, and the UE detects a bypass scheduling (Sidelink Grant) of the eNB before each PSCCH period to acquire the Resource positions of the PSCCH and the bypass data CHannel (PSSCH) sent in the PSCCH period. In Mode 1, resource collision between different UEs can be avoided by centralized control of the eNB.

The UE transmitting D2D broadcast communications via Mode 2 may be located within the coverage area of the cellular network or may be a UE located outside the coverage area of the cellular network. The PSCCH resource pool of Mode 2 and the corresponding PSSCH resource pool configuration are obtained by receiving eNB system broadcast signaling, wherein the PSSCH resource pool comprises a subframe position used for PSSCH transmission in a corresponding PSCCH period and a physical resource block position used for PSSCH transmission in each subframe, and the PSCCH and the transmission resources corresponding to the PSSCH are randomly selected in each PSCCH period. The PSCCH resource pool of the Mode 2 and the corresponding PSSCH resource pool configuration are determined by the latter through the pre-configuration information, and the resource selection Mode is the same as that of the former. In a typical D2D communication environment, the number of UEs for D2D communication transmission In each cell is 3, so that the problems of resource collision and In-band Interference (IBE) which may be caused by random resource selection are not optimized In the 3GPP standard formulation process.

Since the standardized D2D communication in 3GPP Rel-12 mainly aims at low-speed UEs and services with low requirements on delay sensitivity and reception reliability, the implemented D2D function is still far from meeting the user requirements, and in the subsequent 3GPP versions, the functional framework for further enhancing D2D is a widespread consensus of various communication UE manufacturers and communication network equipment manufacturers at present. Among them, based on the current D2D broadcast communication mechanism, supporting direct low-latency high-reliability communication between high-speed devices, between a high-speed device and a low-speed device, and between a high-speed device and a stationary device, that is, V2X (Vehicle to Vehicle/legacy/Infrastructure/Network), is one of the functions that require preferential standardization.

One of the main features of V2X communication is higher transmission UE density compared to the existing D2D communication. For example, in an urban traffic jam environment (average vehicle speed 15km/h), the number of vehicles per square kilometer can reach 2400 vehicles. According to the V2X communication service model specified by ETSI (European telecommunications Standards Institute), the vehicle generates a V2X packet approximately every 1 second, and in general, the message needs to be sent within 100ms after generation, and it can be seen that the density of sending UEs of V2X is much greater than that of D2D. According to the current 3GPP conclusion, V2X communication will follow the Mode 2 Mode defined in D2D, i.e. the sending UE can autonomously select resources within a certain resource pool, however, the large increase in sending UE density renders the V2X communication unable to follow the random resource selection manner in the Mode 2 Mode of D2D, otherwise the resulting resource collision and IBE interference will seriously affect the performance of V2X communication. To address this problem, 3GPP has agreed to introduce a channel detection mechanism in V2X communication, i.e. V2X UEs will detect interference levels in candidate resources, and upon autonomous resource selection, select resources whose interference levels meet the respective conditions.

According to the current 3GPP conclusion, a V2X UE shall perform channel detection in the currently selected resource pool, and if a V2X UE performs resource selection in subframe n, the UE predicts idle resources after n according to the channel detection result in the time range of [ n-a, n-b ], where a-b shall not be less than 1s, so as to obtain sufficiently accurate resource occupancy information, which requires the V2X UE to perform continuous channel detection. However, some UEs with limited battery life also exist in V2X communication environment, for example, in P2V (Pedestrian to Vehicle communication), the type of UE transmitting data is a Pedestrian handheld terminal, unlike a Vehicle, and this type of UE cannot withstand the power consumption caused by long-time channel detection. Such power limited UEs are hereinafter collectively referred to as P-UEs. In order to reduce the power loss of the P-UE, the 3GPP decides that the P-UE can select resources by two resource selection methods, i.e., a method (RM) of selecting transmission resources by random resources and a method (PS) of selecting transmission resources according to the result of incomplete channel detection (Partial Sensing). The UE performing incomplete channel detection should detect signals transmitted by other terminals in Y subframes every X subframes, where Y ≦ X, for example, X ≦ 100 and Y ≦ 10. However, there is no clear method for selecting P-UE resources, i.e. which resource selection method should be used by the P-UE under what circumstances.

Through the above analysis, it can be seen that an explicit P-UE resource selection method is required in the P2V communication scenario, and no such method is disclosed at present.

Disclosure of Invention

The present application aims to solve at least one of the above technical drawbacks, and in particular provides a resource selection method and apparatus in V2X communication, including:

the method comprises the steps that User Equipment (UE) determines the configuration of one or more sending resource pools of current working carriers;

the UE selects one resource pool from the one or more sending resource pools as a sending resource pool;

and the UE selects the transmission resource in the transmission resource pool according to the corresponding resource selection mode and transmits the physical signal.

Preferably, the UE determines the configuration of one or more transmission resource pools of the currently operating carrier by pre-configuration, or

And the UE receives a configuration signaling sent by the eNB and acquires one or more resource pool configuration information on the current working carrier according to the configuration signaling.

Preferably, the configuration of the transmission resource pool of the current working carrier includes one or more of the following information: the method comprises the steps of a subframe set of a resource pool, a physical resource block set of the resource pool and a resource selection mode allowed by the resource pool.

Preferably, if the resource selection mode allowed by the resource pool is a random RM resource selection mode, the resource pool configuration information includes a data priority of the semi-statically occupied resource allowed by the resource pool and a channel occupation ratio threshold allowed by the resource pool; if the resource selection mode allowed by the resource pool is a PS resource selection mode based on incomplete channel detection, the resource pool configuration information may include the priority of data allowed to be sent by the resource pool.

Preferably, if there are multiple alternative resource pools on the current working carrier, and there are both RM resource pools that allow random resource selection and PS resource pools that do not allow RM selection, the UE selects an RM resource pool as the transmission resource pool when the UE does not perform channel detection in the PS resource pool, or when the UE has performed channel detection in the PS resource pool but currently there are no available resources in the PS resource pool according to a specific resource selection condition.

Preferably, if the UE selects the RM resource pool as the transmission resource pool, the UE selects resources in the RM resource pool by an RM resource selection manner, and the UE physical layer performs incomplete channel detection from the subframe p or from the subframe p +1 when any one or more of the following conditions are satisfied:

receiving an incomplete channel detection indication of a UE high layer at a subframe p;

receiving an indication of an eNB;

the configuration information of the PS resource pool comprises the priority of data allowed to be sent by the resource pool, and the priority of data packets to be sent by the UE is higher than the priority of the data allowed to be sent by the resource pool.

Preferably, for a UE performing incomplete channel detection in the PS resource pool, if the UE performs resource reselection in subframe n and there are resources satisfying the available resource condition within the resource selection window [ n + T1, n + T2], the UE selects the PS resource pool performing incomplete channel detection as the transmission resource pool, where T1 and T2 are positive integers.

Preferably, the CBR value R is the current channel occupancy ratio_nWhen the CBR threshold allowed by the resource pool in the resource pool configuration information is larger than the CBR threshold allowed by the resource pool, the UE high layer indicates the UE physical layer to execute incomplete channel detection; or, at the current CBR value R_nWhen the CRB threshold is larger than the CRB threshold allowed by the resource pool in the resource pool configuration information, the UE high level is [0,1]]If the generated random number is larger than a first threshold, indicating the UE physical layer to execute incomplete channel detection, and if the generated random number is smaller than the first threshold, indicating the UE high layer to perform R_nSetting zero;

or, the UE high layer indicates that the UE physical layer executes incomplete channel detection when receiving continuous N UE physical layer event reports, or the UE high layer randomly generates a random number between [0,1] when receiving continuous N UE physical layer event reports, if the generated random number is greater than a second threshold, the UE physical layer is indicated to execute incomplete channel detection, and if the generated random number is less than the second threshold, the UE high layer sets the currently received physical layer report count to zero.

Preferably, the UE physical layer reports the CRB measurement result in each period to the high layer, and the UE high layer performs smooth filtering on the CBR result reported by the physical layer to obtain the current CBR value;

or when the measured CBR value is higher than a third threshold, the UE physical layer reports the event that the CBR value is higher than the third threshold to the high layer;

preferably, if the UE currently selects resources in the PS resource pool by the PS resource selection method, and the subframe p satisfies one or more of the following conditions, the UE physical layer starts incomplete channel detection from the subframe p:

the method comprises the following steps that 1, t + (COUNTER +1) SAI-p < (W), wherein COUNTER is the value of a resource reselection COUNTER in a subframe p, t is the subframe in which the value of the latest resource reselection COUNTER changes, SAI is a resource reservation interval indicated in PSCCH sent by UE for the latest time, and W is the size of an incomplete channel detection window;

a subframe p is the first subframe meeting the condition 1 after the initialization of the latest resource reselection counter;

and 3, the random number between [0,1] generated by the UE in the subframe p is larger than a fourth threshold.

Preferably, the UE selects resources by adopting a single RM resource selection mode;

or, the UE adopts an RM resource selection method with resource reservation.

Preferably, if the UE performs resource selection in subframe n and the UE performs resource selection in a single RM resource selection manner, the UE randomly selects PSCCH and PSCCH resources for new transmission of a current packet in a subframe [ n + T1, n + T2], and if the packet is allowed to be retransmitted, randomly selects PSCCH and PSCCH resources for retransmission of the packet in a subframe [ n + T1, n + T2], where T1 and T2 are positive integers; if the UE adopts an RM resource selection mode with resource reservation, the UE should randomly use frequency resources on a certain subframe within the range of the subframe [ n + T1, n + T2] for PSCCH and PSSCH transmission of initial transmission and retransmission of the current data packet, and reserve the same frequency resources on C subframes at a specific period for PSCCH and PSSCH transmission of new data packets, wherein the value of C is randomly determined by the UE within a certain range.

Preferably, if the priority of the sending data is higher than the data priority of the resource pool configuration allowing the semi-static occupation of the resources, the UE adopts an RM resource selection mode with resource reservation, otherwise, the UE adopts a single RM resource selection mode.

A resource selection device in V2X communication, comprising:

the resource pool configuration determining module is used for selecting a sending resource pool and a sending resource selection and signal sending module;

a resource pool configuration determining module, configured to determine resource pool configuration information on a current working carrier;

a sending resource pool selection module, configured to select a sending resource pool according to the current state of the selectable resource pool and the channel detection state;

and the sending resource selection and signal sending module is used for selecting sending resources in the sending resource pool and sending the physical signals.

According to the technical scheme provided by the application, the UE firstly determines the configuration of one or more sending resource pools of the current working carrier according to the pre-configuration or the eNB signaling indication, then the UE selects the sending resource pools according to the states of the resource pools and the channel detection states, and finally the UE selects the sending resources in the sending resource pools according to the corresponding resource selection mode and sends the physical signals. By the method, when the load of the resource pool allowing random resource selection is low, the UE can select the resource pool as a sending resource pool and select resources in a random resource selection mode, so that the power loss of the UE is reduced. And when the load of the resource pool is higher, the UE supporting incomplete channel detection can select another resource pool as a sending resource pool, so that the load degree of the resource pool can be reduced. The method can give consideration to both the power loss of the UE and the load control of the resource pool, and can effectively improve the overall performance of the system.

Drawings

FIG. 1 is a flow chart of the steps of the embodiment of the present application;

fig. 2 is a schematic diagram of a possible way for a UE to measure a RM resource pool CBR according to the present application;

fig. 3 is a schematic diagram illustrating a UE transmission resource selection method according to the present application;

fig. 4 is a block diagram of a resource selection device according to the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below by referring to the accompanying drawings and examples.

In V2X communication, if the UE sending data is a P-UE, it cannot endure long-time channel detection due to the limitation of UE battery power capability, so the current mechanism for selecting sending resources based on 1s channel detection defined by 3GPP is not suitable for P-UE. For this reason, 3GPP defines a way (RM) to randomly select transmission resources and a way (PS) to select resources based on incomplete channel detection results for P-UEs operating in autonomous resource selection Mode (i.e., Mode 4 defined in current 3GPP standards) to reduce power consumption of P-UEs. However, there is no clear solution at present how P-UE should effectively and reasonably utilize the two choices of transmission resources in practical operation. To this end, the present application proposes a resource selection method in V2X communication, and hereinafter, unless otherwise specified, the UE refers to a P-UE operating in an autonomous resource selection mode or a terminal having the same or similar resource selection requirement as the P-UE operating in the autonomous resource selection mode, as shown in fig. 1, and includes the following steps:

step 110: the UE determines a configuration of one or more transmit resource pools for the current active carrier.

In this application, the configuration of the one or more transmission resource pools of the currently operating carrier includes one or more of the following information: a subframe set of a Resource pool, a Physical Resource Block (PRB) set of the Resource pool, and a Resource selection manner allowed by the Resource pool. If the resource selection mode allowed by the resource pool is RM, the resource pool configuration information may further include a data priority of the semi-statically occupied resource allowed by the resource pool, a Channel occupancy Ratio (CBR) threshold allowed by the resource pool, and the like. If the resource selection mode allowed by the resource pool is PS, the resource pool configuration information may further include the priority of the data allowed to be sent by the resource pool. If the resource selection mode allowed by the resource pool comprises RM, the UE can select the transmission resource in the resource pool in a mode of RM, otherwise, the UE can select the transmission resource in the resource pool only in a mode of PS. Hereinafter, the resource pool where RM selection is allowed is referred to as an RM resource pool, and the resource pool where RM selection is not allowed is referred to as a PS resource pool. In the present application, the RM resource pool and the PS resource pool may partially or completely overlap.

The UE may acquire configuration information of one or more transmission resource pools on the current working carrier by pre-configuration or receiving configuration signaling of the eNB.

Step 120: and the UE selects one resource pool from the one or more transmission resource pools in the last step as a transmission resource pool.

In this application, if there are multiple optional resource pools on the current working carrier, and there are both RM and PS resource pools, the UE should select an RM resource pool if the UE does not perform channel detection in the PS resource pool, or the UE has performed channel detection in the PS resource pool but there is no available resource according to a specific resource selection condition. Otherwise, the UE should select the PS resource pool.

If there is only one resource pool for the current working carrier, the UE directly performs step 130.

Step 130: and the UE selects the transmission resource in the transmission resource pool according to the corresponding resource selection mode and transmits the physical signal.

In order to facilitate understanding of the present application, the following further explains the above technical solution of the present application in an inter-device interaction mode by combining specific application cases as follows:

the first embodiment is as follows:

in this embodiment, the carrier on which the UE currently operates only has an RM resource pool, and the UE performs only RM resource selection within the RM resource pool. The specific method comprises the following steps:

step 210: the UE determines a configuration of one or more transmit resource pools for the current active carrier.

In this embodiment, the configuration of the transmission Resource pool of the current working carrier includes a Resource selection manner allowed by the Resource pool, and includes a subframe set of one or more Resource pools, a Physical Resource Block (PRB) set of the Resource pool, a data priority of a semi-statically occupied Resource allowed by the Resource pool, and the like. Wherein the allowed resource selection mode of the resource pool is RM.

Step 220: and the UE selects the transmission resource in the RM transmission resource pool in an RM resource selection mode and transmits the physical signal.

According to an implementation manner of the embodiment, the UE may perform resource selection in a single RM resource selection manner, in this way, if the UE performs resource selection in the subframe n, the UE should randomly select PSCCH and PSCCH resources for initial transmission of the current packet in the range of the subframe [ n + T1, n + T2], and if the packet is allowed to be retransmitted, further randomly select PSCCH and PSCCH resources for retransmission of the packet in the above range. When the UE transmits the PSCCH on the resources selected in this manner, the UE may set a resource occupancy period field (Reservation Interval) to zero or to a random value to randomize cyclic redundancy check, CRC, bits of the PSCCH. The UE shall set the Priority field (Priority) in the PSCCH to the Priority of the currently transmitted data, or set to zero, or set to a random value using a similar method as the resource occupying period field, to further randomize the cyclic redundancy check CRC bits of the PSCCH. Wherein T1 and T2 are positive integers, selection is realized by UE, T1 is not more than 4, T2 is not more than 20, T2 value selected by UE must meet the time delay requirement of data packets.

In accordance with another implementation of the present application,the UE may employ an RM resource selection mode with resource reservation, in which, if the UE satisfies a resource reselection condition at subframe n, the UE should be at subframe [ n + T1, n + T2]]The frequency resource on a random subframe in the range is used for PSCCH and PSSCH transmission of initial transmission of the current data packet, and the same frequency resource on C subframes is reserved in a specific period for PSCCH and PSSCH transmission of the new data packet, wherein the value of C is randomly determined by UE in a certain range, preferably, the certain range can be between [5 and 15 ]]. Specifically, if the UE selects a frequency resource on subframe m at subframe n, where m belongs to [ n + T1, n + T2]Then the UE further reserves the subframe

The same frequency resource above, wherein i ═ 1,2,3, …, C, P_rsvp,iThe reservation interval for the ith reserved resource is determined by the UE, it should be noted that the reservation intervals for the C reserved resources may be equal, in which case the UE further reserves the subframe m + i × P_rsvpWherein i is 1,2,3, …, C, P_rsvpThe reservation interval for reserving resources is decided by the UE implementation. If the UE is further in the sub-frame n [ n + T1, n + T2] in the sub-frame n]If the retransmission resource of the data packet is selected in the range, the UE should reserve the retransmission resource for C times with the same reservation interval in the same manner as the initial transmission resource.

Compared with the RM resource selection mode with resource reservation, the UE adopting the single RM resource selection mode randomly selects the transmission resource of each data packet, and can avoid continuous resource collision among a plurality of UEs. And when the resource pool has the UE for selecting the resources based on the channel detection, if an RM resource selection mode with resource reservation is adopted, the part of resources can be protected from being interfered by the UE for selecting the resources through the channel detection. The UE may determine which RM resource selection method to use according to the priority of the transmitted data, for example, if the priority of the transmitted data is higher than the data priority obtained in step 210, which allows the semi-static occupied resources, the UE uses the RM resource selection method with resource reservation, so as to better protect the high-priority data, otherwise, the UE uses the single RM resource selection method to avoid generating too many persistent resource collisions; or, if the current transmission resource pool of the UE only allows the RM resource selection method, the UE adopts the single RM resource selection method, and if the current transmission resource pool allows both the RM resource selection method and the PS resource selection method, the UE adopts the RM resource selection method with resource reservation.

To this end, in this embodiment, only an RM resource pool exists on the carrier where the UE currently operates, and the UE may select resources in the RM resource pool in a single RM resource selection manner or an RM resource selection manner with reserved resources, so that resource selection of the UE can be achieved with low complexity.

The second embodiment:

in this embodiment, both an RM resource pool and a PS resource pool exist on the carrier on which the UE currently operates, and the UE does not perform PS resource selection in the RM resource pool. If the UE supports the PS resource selection mode, the UE starts to perform channel detection in the PS resource pool when the RM resource pool CBR is higher than a certain specific threshold, if the resource selection window of the PS resource pool has resources meeting specific available resource conditions when the UE performs resource selection, the UE selects the resources in the PS resource pool, and otherwise, the UE selects the resources in the RM resource pool. If the UE does not support the PS resource selection method, the UE performs resource selection in the RM resource pool by the method described in the first embodiment, which will not be described in detail in this embodiment. It should be particularly noted that, in this embodiment, the RM resource pool and the PS resource pool may completely or partially overlap. The specific method comprises the following steps:

step 310: the UE determines a configuration of one or more transmit resource pools for the current active carrier.

In the embodiment, an RM resource pool and a PS resource pool exist on a carrier on which the UE currently operates, and for the RM resource pool, the resource pool configuration information should include a subframe set of the resource pool, a PRB set of the resource pool, a resource selection manner allowed by the resource pool, a data priority of a semi-static occupied resource allowed by the resource pool, whether the resource pool allows the UE supporting the PS resource selection manner to use, and if so, a CBR threshold (hereinafter, referred to as a CBR threshold allowed by the resource pool) allowed by the resource pool for the type of UE to use. The CBR threshold allowed by the resource pool indicates that, when the CBR value of the resource pool is smaller than the threshold, the UE supporting the PS resource selection mode can select a resource in the resource pool, otherwise, the UE of the type is not allowed to select a resource in the resource pool. It should be specially noted that whether the resource pool allows the UE supporting the PS resource selection manner to use may be indicated by setting the CBR threshold allowed by the resource pool to negative infinity. If the resource selection mode allowed by the resource pool is PS, the resource pool configuration information may further include the priority of the data allowed to be sent by the resource pool.

The UE may obtain the resource pool configuration information on the current working carrier through pre-configuration or receiving the configuration signaling of the eNB.

Step 320: and the UE selects one resource pool from the one or more transmission resource pools in the last step as a transmission resource pool.

In this embodiment, if the UE supports the PS resource selection mode, the UE physical layer should measure the CBR of the resource pool in the RM resource pool, and report the measurement result to the higher layer of the UE. Wherein, CBR can be defined as the ratio of resources with a bypass received signal strength indicator (S-RSSI) above a certain threshold in a certain time range; wherein the UE may determine the value of the specific time range through pre-configuration, eNB configuration or standard definition, for example, the value of the specific time range may be defined as 100ms by the standard; the UE may determine the value of the particular threshold by pre-configuration, eNB configuration, or standard definition.

The UE may measure the CBR of the RM resource pool according to a specific period, which the UE may determine by pre-configuration, eNB configuration or standard definition. For example, the specific period is defined by the standard as 10 s. Fig. 2 shows a possible way for the UE to measure the CBR of the RM resource pool, where the time range of CBR measurement is 100ms and the measurement period of CBR is 10 s.

According to an implementation manner of the present application, the UE physical layer reports the CRB measurement result in each period to the upper layer, and the UE upper layer performs smooth filtering on the CBR result reported by the physical layer to obtain a current CBR value, for example, the current CBR value R_nCan be R_n＝(1-α)×R_n-1+α×r_nWherein R is_n-1Represents the CBR value r corresponding to the last physical layer report_nThe CBR value reported by the physical layer of the current UE is represented, α represents a smoothing filter coefficient, and the UE may determine the value of α through pre-configuration, eNB configuration or standard definition.

According to the mode, the UE higher layer can be in R_nAnd when the threshold is larger than the CBR threshold allowed by the resource pool in the resource pool configuration information, directly indicating the UE physical layer to execute incomplete channel detection. Alternatively, the UE higher layer may be at R_nGreater than the above threshold at [0,1]]If the generated random number is larger than a certain threshold (the UE can determine the value of the certain threshold through pre-configuration, eNB configuration or standard definition), the UE physical layer is instructed to perform incomplete channel detection, and if the generated random number is smaller than the certain threshold, the UE high layer will perform R_nAnd setting zero. The CBR threshold allowed by the resource pool may relate to the priority of the UE for transmitting data, i.e. the threshold may be higher or lower in inverse relation to the priority of the UE for transmitting data (the higher the priority is, the lower the threshold is), and the threshold may include positive infinity and negative infinity. It should be specially noted that, if the threshold value is positive infinity, the UE may not perform CBR measurement; if the threshold value is negative infinity, if the UE supports the PS resource selection method, the UE does not allow to select transmission resources in the RM resource pool.

According to another implementation of the present application, the UE physical layer reports the CBR value to the higher layer when the measured CBR value is higher than a certain threshold. The UE may determine the value of the particular threshold by pre-configuration, eNB configuration, or standard definition. According to this approach, the UE high layer indication may indicate that the UE physical layer performs incomplete channel detection upon receiving N consecutive UE physical layer event reports. Or, the UE high layer may randomly generate a random number between [0,1] when receiving N consecutive UE physical layer event reports, instruct the UE physical layer to perform incomplete channel detection if the generated random number is greater than a certain threshold (the UE may determine a value of the certain threshold by pre-configuration, eNB configuration, or standard definition), and set the currently received physical layer report count to zero if the generated random number is less than the certain threshold. The UE may determine the value of N through pre-configuration, eNB configuration, or standard definition, and the value of N may be related to a threshold for the UE to transmit data, for example, the value of N may be inversely related to a priority for the UE to transmit data (the higher the priority, the smaller N is), and the value of N may include positive infinity and 0. It should be specially noted that, if the threshold value is positive infinity, the UE may not perform CBR measurement; if the threshold value is 0, if the UE supports the PS resource selection mode, the UE does not allow to select the transmission resource in the RM resource pool.

If the UE currently selects resources in the RM resource pool by RM resource selection, the UE physical layer may perform incomplete channel detection in the PS resource pool starting from subframe p or starting from subframe p +1 when one or more of the following conditions are met:

receiving an incomplete channel detection indication of a UE high layer at a subframe p; alternatively, the first and second electrodes may be,

receiving an indication of an eNB; alternatively, the first and second electrodes may be,

the configuration information of the PS resource pool includes the priority of data allowed to be sent by the resource pool, and the priority of data packets to be sent by the UE is higher than the priority.

If the UE currently selects resources in the PS resource pool by the PS resource selection method, the UE physical layer may start incomplete channel detection from the subframe p if the subframe p satisfies one or more of the following conditions:

condition 1: t + (COUNTER + 1). SAI-p<W, where COUNTER is the value of the RESOURCE RESELECTION COUNTER (SL _ RESOURCE _ reset _ COUNTER) in subframe P, t is the subframe in which the value of the most recent RESOURCE RESELECTION COUNTER has changed, and SAI is the RESOURCE reservation interval indicated by the UE most recently or in the PSCCH sent at subframe t (i.e., the value of the RESOURCE reservation interval field in the PSCCH sent most recently or at subframe t is multiplied by the basic reservation interval P)_step) W is an incomplete channel detection window size, and the UE may determine a value of W by pre-configuration, eNB configuration, or standard definition, for example, W is 1001;

condition 3 is that the random number between [0,1] generated by the UE in the subframe p is greater than a certain threshold, and the UE may determine the value of the threshold through pre-configuration, eNB configuration or standard definition.

For the UE performing incomplete channel detection, if the UE performs resource reselection in the subframe n, if resources meeting a specific available resource condition exist in a resource selection window [ n + T1, n + T2], the UE selects a PS resource pool performing incomplete channel detection as a transmission resource pool, and otherwise, the UE selects an RM resource pool as the transmission resource pool. Wherein the particular available resource condition may be defined by a criterion, e.g. if the resource is located in subframe j, where j belongs to [ n + T1, n + T2], the UE detects at least subframe j-M, where M comprises 100,200,300,400,500,600,700,800,900 and 1000, and the interference from other terminals on this resource estimated from the detection result is sufficiently low.

Step 330: and the UE selects the transmission resource in the transmission resource pool according to the corresponding resource selection mode and transmits the physical signal.

If the transmission resource pool selected by the UE is the RM resource pool, the manner of selecting the resource in the transmission resource pool by the UE is the same as the first embodiment. If the transmission resource pool selected by the UE is a PS resource pool, the UE randomly selects transmission resources of the PSCCH and the PSSCH from the resources meeting the specific available resource condition in a resource selection window [ n + T1, n + T2 ].

It should be specially noted that, if the UE selects the transmission resource based on the incomplete channel detection, the UE may directly perform resource reselection after the resource reselection counter is reset to zero, that is, after the resource reselection counter is reset to zero, the UE skips the operation of randomly generating a random number (i.e., parameter probResourceKeep defined in the current standard) in [0,1] and comparing the random number with a specific threshold, which is defined in the current standard, and directly performs resource reselection.

This embodiment ends by this. In this embodiment, when the congestion degree of the RM resource pool is low, the UE may select the transmission resource in the RM resource pool in the RM resource selection manner, so as to reduce energy loss of the UE. When the RM resource pool is congested, the UE supporting incomplete channel detection is unloaded to the PS resource pool according to a certain probability, thereby being beneficial to reducing the congestion condition in the RM resource pool.

Example three:

in this embodiment, both an RM resource pool and a PS resource pool exist on the carrier on which the UE currently operates, and the UE does not perform PS resource selection within the RM resource pool. If the UE executes incomplete channel detection in the PS resource pool, the UE stops the incomplete channel detection and selects resources in the RM resource pool when the RM resource pool CBR is lower than a certain threshold by a certain amplitude. If the UE does not support the PS resource selection method, the UE performs resource selection in the RM resource pool by the method described in the first embodiment, which will not be described in detail in this embodiment. It should be particularly noted that, in this embodiment, the RM resource pool and the PS resource pool may completely or partially overlap. The specific method comprises the following steps:

step 410: the UE determines a configuration of one or more transmit resource pools for the current active carrier.

In the embodiment, an RM resource pool and a PS resource pool exist on a carrier on which the UE currently operates, and for the RM resource pool, the resource pool configuration information should include a subframe set of the resource pool, a PRB set of the resource pool, a resource selection manner allowed by the resource pool, a data priority of a semi-static occupied resource allowed by the resource pool, whether the resource pool allows the UE supporting the PS resource selection manner to use, and if so, a CBR threshold (hereinafter, referred to as a CBR threshold allowed by the resource pool) that the resource pool allows the UE of the type to use. It should be specially noted that whether the resource pool allows the UE supporting the PS resource selection manner to use may be indicated by setting the CBR threshold allowed by the resource pool to negative infinity. If the resource selection mode allowed by the resource pool is PS, the resource pool configuration information may further include the priority of the data allowed to be sent by the resource pool.

Step 420: and the UE selects one resource pool from the one or more transmission resource pools in the last step as a transmission resource pool.

According to the mode, the UE higher layer can be in R_nAnd when the value is lower than the CBR threshold allowed by the resource pool in the resource pool configuration information by a certain amplitude (the value of the amplitude can be determined by pre-configuration, eNB configuration or standard definition) directly indicating the physical layer of the UE to stop executing incomplete channel detection. Alternatively, the UE higher layer may be at R_nNot greater than the above threshold value at [0,1]]If the generated random number is larger than a certain threshold (the UE can determine the value of the certain threshold through pre-configuration, eNB configuration or standard definition), the UE physical layer is instructed to stop performing incomplete channel detection, and if the generated random number is smaller than the certain threshold, the UE high layer sends R_nAnd (5) setting to zero. The CBR threshold allowed by the resource pool may be related to the priority of the UE for transmitting data, that is, the threshold may be higher or lower than the threshold when the UE transmits dataIs positively correlated (the higher the priority the higher the threshold), and the threshold value may include positive infinity and negative infinity. It should be specially noted that, if the threshold value is negative infinity, the UE may not perform CBR measurement; if the threshold value is positive infinity, if the UE supports the PS resource selection method, the UE does not allow to select transmission resources in the RM resource pool.

According to another implementation of the present application, the UE physical layer reports the CBR value to the higher layer when the measured CBR value is below a certain threshold. The UE may determine the value of the particular threshold by pre-configuration, eNB configuration, or standard definition. According to this approach, the UE high layer indication may indicate that the UE physical layer stops performing incomplete channel detection when N consecutive UE physical layer event reports are received. Or, the UE high layer may randomly generate a random number between [0,1] when receiving N consecutive UE physical layer event reports, instruct the UE physical layer to perform incomplete channel detection if the generated random number is greater than a certain threshold (the UE may determine a value of the certain threshold by pre-configuration, eNB configuration, or standard definition), and set the currently received physical layer report count to zero if the generated random number is less than the certain threshold. The UE may determine the value of N through pre-configuration, eNB configuration, or standard definition, and the value of N may be related to a threshold for the UE to transmit data, for example, the value of N may be positively related to a priority for the UE to transmit data (the higher the priority is, the larger N is), and the value of N may include positive infinity and 0. It should be specially noted that, if the threshold value is 0, the UE may not perform CBR measurement; if the threshold value is positive infinity, if the UE supports the PS resource selection method, the UE does not allow to select transmission resources in the RM resource pool.

If the UE currently selects resources in the PS resource pool through a PS resource selection mode, or incomplete channel detection is performed in the PS resource pool, and an incomplete channel detection stopping indication of a UE high layer is received in a subframe r, the UE physical layer can stop performing the incomplete channel detection from the subframe r or from a subframe r + 1.

And if the UE performs resource reselection in the subframe n and the UE currently stops performing incomplete channel detection according to the high-level indication, the UE selects an RM resource pool as a sending resource pool.

Step 430: and the UE selects the transmission resource in the transmission resource pool according to the corresponding resource selection mode and transmits the physical signal.

The manner in which the UE selects resources in the transmission resource pool is the same as in the first embodiment.

According to the methods provided in the first, second and third embodiments of the present application, a resource selection manner of a UE is shown in fig. 3.

This embodiment ends by this. In this embodiment, the UE that selects the transmission resource in the PS resource pool or performs incomplete channel detection may reuse the RM resource pool as the transmission resource pool according to a certain probability after the congestion degree of the RM resource pool is reduced, so as to reduce the energy loss of the UE.

Example four:

in this embodiment, the UE supports a PS resource selection method, and performs channel detection in the PS resource pool according to a specific rule, and performs resource selection in the PS resource pool according to a detection result. The specific method comprises the following steps:

step 510: the UE determines a configuration of one or more transmit resource pools for a current operating carrier.

In an embodiment, the UE should at least determine the configuration of the PS resource pool, and the configuration information of the PS resource pool should at least include a subframe set of the resource pool and a PRB set of the resource pool.

Step 520: and the UE selects one resource pool from the one or more transmission resource pools in the last step as a transmission resource pool.

In this embodiment, if the UE currently selects resources in the RM resource pool by an RM resource selection method, and receives an incomplete channel detection indication from a higher layer of the UE in a subframe p, or receives an indication from the eNB, or the configuration information of the PS resource pool includes a priority of data that the resource pool allows to send, and the priority of a data packet to be sent by the UE is higher than the priority, the UE physical layer may perform incomplete channel detection in the PS resource pool from the subframe p or from the subframe p + 1.

condition 1: t + (COUNTER + 1). SAI-100-p<W, where COUNTER is the value of the RESOURCE RESELECTION COUNTER (SL _ RESOURCE _ reset _ COUNTER) at subframe t, t is the subframe where the value of the most recent RESOURCE RESELECTION COUNTER has changed, and SAI is the RESOURCE reservation interval indicated by the UE most recently or in the PSCCH sent at subframe t (i.e., the value of the RESOURCE reservation interval field in the PSCCH sent most recently or at subframe t is multiplied by the basic reservation interval P)_step) W is an incomplete channel detection window size, and the UE may determine a value of W by pre-configuration, eNB configuration, or standard definition, for example, where W is 1001, or a maximum resource occupation period allowed by a current resource pool configured or pre-configured for the eNB;

For a UE performing incomplete channel detection, it is preferable that signals transmitted by other terminals on Y subframes should be detected every X subframes, starting from subframe p, where Y ≦ X, e.g., X ≦ 100 and Y ≦ 10. Preferably, assuming that the UE performs resource reselection in the subframe n, if resources meeting a specific available resource condition exist in the resource selection window [ n + T1, n + T2], the UE selects a PS resource pool for performing incomplete channel detection as a transmission resource pool, and otherwise, the UE may select an RM resource pool as the transmission resource pool. Wherein the particular available resource condition may be defined by a criterion, e.g. if the resource is located in subframe j, where j belongs to [ n + T1, n + T2], the UE detects at least subframe j-M, where M comprises 100,200,300,400,500,600,700,800,900 and 1000, and the interference from other terminals on this resource estimated from the detection result is sufficiently low.

Step 530: and the UE selects the transmission resource in the transmission resource pool according to the corresponding resource selection mode and transmits the physical signal.

This embodiment is ended up so far. By the method of the embodiment, the complexity of UE resource selection can be reduced as much as possible, and the power loss of UE channel detection can be reduced.

Example five:

in this embodiment, the UE supports a PS resource selection manner, performs channel detection in the PS resource pool according to a specific rule, and the number of subframes for performing channel detection by the UE cannot be smaller than a specific value, and finally performs resource selection in the PS resource pool according to a detection result. The specific method comprises the following steps:

step 610: the UE determines a configuration of one or more transmit resource pools for a current operating carrier.

The UE may acquire configuration information of one or more transmission resource pools on the current working carrier through pre-configuration or receiving configuration signaling of the eNB.

Step 620: and the UE selects one resource pool from the one or more transmission resource pools in the last step as a transmission resource pool.

In this embodiment, if the UE currently selects resources in the RM resource pool by an RM resource selection method, and receives an incomplete channel detection indication from a higher layer of the UE in a subframe p, or receives an indication from the eNB, or the configuration information of the PS resource pool includes a priority of data that the resource pool allows to send, and the priority of a data packet to be sent by the UE is higher than the priority, the UE physical layer may perform incomplete channel detection in the PS resource pool from the subframe p or from the subframe p + 1. If the UE higher layer instructs the UE physical layer to perform incomplete channel detection in the PS resource pool, the UE higher layer may further instruct the packet generation period assumed when performing incomplete channel detection.

If the UE currently selects resources in the PS resource pool by the PS resource selection method, the UE physical layer may perform channel detection in the subframe q if the subframe q satisfies one or more of the following conditions:

condition 1 subframe q + k belongs to the set [ T + M1, T + M2]]. Where the choice of M1 and M2 is decided by the UE implementation, however, the set [ t + (COUNTER +1) × SAI + M1, t + (COUNTER +1) × SAI + M2]The number of the subframes in the UE is not less than Y, and the UE obtains the value of Y through the configuration or the pre-configuration of the eNB; k belongs to a set K, the UE determines elements in the set K through receiving the eNB configuration or through pre-configuration, and the elements in the set K can be used for representing the resource reservation period supported in the current resource pool; according to a first determination method of T in the present application, T is determined by a UE physical layer, where T ═ T + (COUNTER +1) × SAI + M1, COUNTER is a value of a RESOURCE RESELECTION COUNTER (SL _ RESOURCE _ RESELECTION _ COUNTER) at a subframe T, T is an arrival subframe of a latest packet, or a subframe in which a value of the latest RESOURCE RESELECTION COUNTER has changed, or a subframe in which RESOURCE RESELECTION was performed most recently, or a subframe p or p + 1; SAI is the resource reservation interval indicated in the PSCCH most recently transmitted by the UE (i.e. the value of the resource reservation interval field in the PSCCH most recently transmitted or transmitted in subframe t is multiplied by the basic reservation interval P_step) Or a packet generation period assumed when performing incomplete channel detection indicated by the UE higher layer. According to the second determination method of T in the application, T is determined by the MAC layer of the UE, and preferably, the value of T is indicated to the physical layer of the UE before T-1000.The MAC layer of the UE may determine T in the same manner as T or may be implemented by the UE.

Condition 2, the random number between [0,1] generated by the UE physical layer or the UE MAC layer at a certain time after the last resource reselection is greater than a certain threshold, and the UE may determine the value of the threshold (i.e. the parameter probResourceKeep defined in the current standard) through pre-configuration, eNB configuration or standard definition. The value of the threshold is used to configure the probability that the UE continues to use the currently selected resource.

Condition 3: the UE transmits any signal on the carrier on which subframe q is not located in the PS resource pool.

For a UE adopting PS resource selection, if the UE performs resource reselection in a subframe n, if the subframe [ n + (Δ, t + (COUNTER +1) × SAI + M2] belongs to a set [ t + (COUNTER +1) × SAI + M1, t + (COUNTER +1) × SAI + M2] within the range of the subframe [ n + (Δ, t + (COUNTER +1) × SAI + M2] is not less than Y, the UE selects a PS resource pool performing incomplete channel detection as a transmission resource pool, otherwise, the UE may select an RM resource pool as the transmission resource pool.

Step 630: and the UE selects the transmission resource in the transmission resource pool according to the corresponding resource selection mode and transmits the physical signal.

If the transmission resource pool selected by the UE is the RM resource pool, the manner of selecting the resource in the transmission resource pool by the UE is the same as the first embodiment. If the sending resource pool selected by the UE is a PS resource pool, the UE randomly selects the sending resources of PSCCH and PSSCH from the resources meeting the specific available resource condition in the intersection range of the set [ n + delta, t + (COUNTER +1) × SAI + M2] and the set [ t + (COUNTER +1) × SAI + M1, t + (COUNTER +1) × SAI + M2 ]. The resources sufficient for the specific available resource condition may be all resources belonging to the PS resource pool in the intersection of the two sets, or resources estimated from the detection result that the interference level is low enough or not occupied by other UEs sending high priority data.

It should be specially noted that, if the UE selects a transmission resource based on incomplete channel detection, the UE may directly perform resource reselection after the resource reselection counter is reset to zero, that is, after the resource reselection counter is reset to zero, the UE skips an operation defined in the current standard of randomly generating a random number [0,1] (i.e., a parameter probResourceKeep defined in the current standard) and comparing the random number with a specific threshold, and directly performs resource reselection.

This embodiment ends by this. Compared with the fourth embodiment, the number of subframes for the UE to perform channel detection is restricted in this embodiment, so that it is ensured that the subframes which are fully detected are used as candidate subframes when the UE performs resource reselection.

The present application also discloses a resource selection device in V2X communication, whose composition structure is shown in fig. 4, including: a resource pool configuration determining module, a sending resource pool selecting module and a sending resource selecting and signal sending module, wherein:

a resource pool configuration determining module, configured to determine configuration information of one or more sending resource pools on a current working carrier;

a sending resource pool selection module, which is used for selecting a sending resource pool according to the current selectable resource pool state, the channel detection state and the like;

It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.

In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a separate product, may also be stored in a computer-readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A method performed by a User Equipment (UE) in a communication system, the method comprising:

the UE determines the configuration of one or more sending resource pools of the current working carrier;

the UE selects a sending resource in a sending resource pool according to a corresponding resource selection mode and sends a physical signal;

wherein the selecting, by the UE, one resource pool from the one or more transmission resource pools as a transmission resource pool includes:

if there are multiple alternative resource pools on the current working carrier, and there are both RM resource pools that allow random resource selection and PS resource pools that do not allow RM selection, the UE selects an RM resource pool as the transmission resource pool when the UE has not performed channel detection in the PS resource pool, or when the UE has performed channel detection in the PS resource pool but currently there are no available resources in the PS resource pool according to a specific resource selection condition.

2. The method of claim 1, wherein determining, by the UE, the configuration of the one or more transmit resource pools for the current active carrier comprises:

the UE determines the configuration of one or more transmission resource pools of the current working carrier through pre-configuration, or

3. The method according to claim 1 or 2, wherein the configuration of the transmission resource pool of the currently active carrier comprises one or more of the following information: the method comprises the steps of a subframe set of a resource pool, a physical resource block set of the resource pool and a resource selection mode allowed by the resource pool.

4. The method of claim 3, wherein:

if the resource selection mode allowed by the resource pool is a random RM resource selection mode, the resource pool configuration information comprises the data priority of the semi-static occupied resources allowed by the resource pool and the channel occupation ratio threshold allowed by the resource pool; if the resource selection mode allowed by the resource pool is a PS resource selection mode based on incomplete channel detection, the resource pool configuration information includes the priority of data allowed to be sent by the resource pool.

5. The method of claim 1, wherein:

if the UE selects the RM resource pool as the transmission resource pool, the UE selects resources in the RM resource pool in an RM resource selection mode, and the UE physical layer performs incomplete channel detection from the subframe p or from the subframe p +1 when any one or more of the following conditions are met:

receiving an indication of an eNB;

6. The method of claim 1, wherein:

for a UE performing incomplete channel detection in the PS resource pool, if the UE performs resource reselection in subframe n and there are resources satisfying the available resource condition within a resource selection window [ n + T1, n + T2], the UE selects the PS resource pool performing incomplete channel detection as a transmission resource pool, where T1 and T2 are positive integers.

7. The method of claim 6, wherein:

at the current channel occupancy ratio CBR value R_nWhen the CBR threshold allowed by the resource pool in the resource pool configuration information is larger than the CBR threshold allowed by the resource pool, the UE high layer indicates the UE physical layer to execute incomplete channel detection; or, at the current CBR value R_nWhen the CRB threshold allowed by the resource pool in the resource pool configuration information is larger than the CRB threshold allowed by the resource pool, the UE high layer is in [0,1]]If the generated random number is larger than a first threshold, indicating the UE physical layer to execute incomplete channel detection, and if the generated random number is smaller than the first threshold, indicating the UE high layer to perform R_nSetting zero;

8. The method of claim 7, wherein:

the UE physical layer reports the CRB measurement result in each period to a high layer, and the UE high layer carries out smooth filtering on the CBR result reported by the physical layer to obtain a current CBR value;

or when the measured CBR value is higher than the third threshold, the UE physical layer reports the fact that the CBR value is higher than the third threshold to the high layer.

9. The method of claim 1, wherein:

if the UE currently selects resources in the PS resource pool in a PS resource selection mode and the subframe p meets one or more of the following conditions, starting incomplete channel detection from the subframe p by the UE physical layer:

the method comprises the following steps that 1, t + (COUNTER +1) SAI-p-100< (W), wherein COUNTER is a value of a resource reselection COUNTER in a subframe p, t is a subframe in which the value of a latest resource reselection COUNTER changes, SAI is a resource reservation interval indicated in PSCCH sent by UE at the latest time, and W is the size of an incomplete channel detection window;

10. The method of claim 1, wherein the UE selects a transmission resource and transmits the physical signal according to a corresponding resource selection manner in the transmission resource pool, comprising:

UE adopts a single RM resource selection mode to select resources;

or, the UE adopts an RM resource selection mode with resource reservation.

11. The method of claim 10, wherein:

if the UE performs resource selection in a subframe n and the UE performs resource selection in a single RM resource selection mode, the UE randomly selects PSCCH and PSSCH resources used for newly transmitting a current data packet in a subframe [ n + T1, n + T2], and randomly selects PSCCH and PSSCH resources for retransmitting the data packet in a subframe [ n + T1, n + T2] if the data packet allows retransmission, wherein T1 and T2 are positive integers; if the UE adopts an RM resource selection mode with resource reservation, the UE should randomly use frequency resources on a certain subframe within the range of the subframe [ n + T1, n + T2] for PSCCH and PSSCH transmission of initial transmission and retransmission of the current data packet, and reserve the same frequency resources on C subframes at a specific period for PSCCH and PSSCH transmission of new data packets, wherein the value of C is randomly determined by the UE within a certain range.

12. The method of claim 10, wherein:

if the priority of the sent data is higher than the data priority of the resource pool configuration which allows the semi-static occupied resources, or the resource pool currently selected by the UE allows both RM resource selection and PS resource selection, the UE adopts an RM resource selection mode with resource reservation, otherwise, the UE adopts a single RM resource selection mode.

13. A method performed by a user equipment, UE, in a communication system, comprising:

wherein, the UE selects the transmission resource and transmits the physical signal in the transmission resource pool according to the corresponding resource selection mode, which comprises:

the method comprises the steps that resource selection is carried out on UE in a single RM resource selection mode, wherein the UE randomly selects PSCCH and PSSCH resources used for new transmission of a current data packet in a subframe [ n + T1, n + T2], and if the data packet is allowed to be retransmitted, the PSCCH and PSSCH resources used for retransmission of the data packet are randomly selected in a range [ n + T1, n + T2], wherein T1 and T2 are positive integers;

alternatively, the first and second electrodes may be,

the UE adopts an RM resource selection mode with resource reservation, wherein the UE should randomly use frequency resources on a certain subframe within the range of the subframe [ n + T1, n + T2] for PSCCH and PSSCH transmission of initial transmission and retransmission of the current data packet, and reserve the same frequency resources on C subframes at a specific period for PSCCH and PSSCH transmission of new data packets, wherein the value of C is randomly determined by the UE within a certain range.

14. The method of claim 13, wherein the UE determining the configuration of the one or more transmit resource pools for the currently active carrier comprises:

15. The method according to claim 13 or 14, wherein the configuration of the transmission resource pool of the currently operating carrier comprises one or more of the following information: the method comprises the steps of a subframe set of a resource pool, a physical resource block set of the resource pool and a resource selection mode allowed by the resource pool.

16. The method of claim 15, wherein:

if the resource selection mode allowed by the resource pool is a random RM resource selection mode, the resource pool configuration information comprises the data priority of the semi-static occupied resources allowed by the resource pool and the channel occupation ratio threshold allowed by the resource pool; and if the resource selection mode allowed by the resource pool is a PS resource selection mode based on incomplete channel detection, the resource pool configuration information comprises the priority of the data allowed to be sent by the resource pool.

17. The method of claim 13, wherein the UE selects one of the one or more transmission resource pools as a transmission resource pool, comprising:

18. The method of claim 17, wherein:

receiving an indication of an eNB;

19. The method of claim 17, wherein:

20. The method of claim 19, wherein:

at the current channel occupancy ratio CBR value R_nWhen the CBR threshold allowed by the resource pool in the resource pool configuration information is larger than the CBR threshold allowed by the resource pool, the UE high layer indicates the UE physical layer to execute incomplete channel detection; or, at the current CBR value R_nWhen the CRB threshold is larger than the CRB threshold allowed by the resource pool in the resource pool configuration information, the UE high level is [0,1]]If the generated random number is larger than a first threshold, indicating the UE physical layer to execute incomplete channel detection, and if the generated random number is smaller than the first threshold, indicating the UE high layer to perform R_nSetting zero;

21. The method of claim 20, wherein:

22. The method of claim 17, wherein:

23. The method of claim 13, wherein:

24. A user equipment, UE, in a communication system, comprising:

a sending resource pool selecting module, configured to select a sending resource pool according to a current state of the selectable resource pool and a current state of channel detection, where the selecting the sending resource pool includes: if a plurality of optional resource pools exist on the current working carrier, and an RM resource pool allowing random resource selection and a PS resource pool not allowing RM selection exist, the UE selects the RM resource pool as a sending resource pool when the UE already performs channel detection in the PS resource pool but currently does not have available resources in the PS resource pool according to a specific resource selection condition;

25. The UE of claim 24, wherein determining the resource pool configuration information on the current working carrier comprises:

determining the configuration of one or more transmission resource pools of the current working carrier by pre-configuration, or

And receiving a configuration signaling sent by the eNB, and acquiring one or more resource pool configuration information on the current working carrier according to the configuration signaling.

26. The UE of claim 24 or 25, wherein the resource pool configuration on the current working carrier comprises one or more of the following information: the method comprises the steps of a subframe set of a resource pool, a physical resource block set of the resource pool and a resource selection mode allowed by the resource pool.

27. The user equipment of claim 26, wherein:

28. The user equipment of claim 24, wherein:

if the RM resource pool is selected as the transmission resource pool, resources are selected in an RM resource pool in an RM resource selection mode, and the UE physical layer performs incomplete channel detection from the subframe p or from the subframe p +1 when any one or more of the following conditions are met:

receiving an indication of an eNB;

29. The user equipment of claim 24, wherein:

30. The user equipment of claim 29, wherein:

31. The user equipment of claim 30, wherein:

32. The user equipment of claim 24, wherein:

if the resources are currently selected in the PS resource pool by the PS resource selection mode, and the subframe p meets one or more of the following conditions, the UE physical layer starts incomplete channel detection from the subframe p:

33. The UE of claim 24, wherein selecting a transmission resource and transmitting a physical signal in a transmission resource pool comprises:

selecting resources by adopting a single RM resource selection mode;

or, an RM resource selection mode with resource reservation is adopted.

34. The user equipment of claim 33, wherein:

if the resource selection is carried out in a subframe n and a single RM resource selection mode is adopted for resource selection, PSCCH and PSSCH resources used for new transmission of a current data packet are randomly selected in a range of subframes [ n + T1, n + T2], and PSCCH and PSSCH resources used for retransmission of the data packet are randomly selected in a range of [ n + T1, n + T2] if the data packet is allowed to be retransmitted, wherein T1 and T2 are positive integers; if an RM resource selection mode with resource reservation is adopted, frequency resources on a certain random subframe within the range of subframes [ n + T1, n + T2] are used for PSCCH and PSSCH transmission of initial transmission and retransmission of a current data packet, and the same frequency resources on C subframes are reserved at a specific period for PSCCH and PSSCH transmission of a new data packet, wherein the value of C is randomly determined by UE within a certain range.

35. The user equipment of claim 33, wherein:

if the priority of the transmitted data is higher than the data priority of the resource pool configuration which allows the semi-static occupation of the resources, or the currently selected resource pool allows both RM resources and PS resources to be selected, an RM resource selection mode with resource reservation is adopted, otherwise, a single RM resource selection mode is adopted.

36. A user equipment, UE, in a communication system, comprising:

a transmission resource selection and signal transmission module, configured to select a transmission resource in a transmission resource pool and transmit a physical signal, where the selecting a transmission resource in the transmission resource pool and transmitting a physical signal includes:

selecting resources by adopting a single RM resource selection mode, wherein PSCCH and PSSCH resources used for new transmission of a current data packet are randomly selected in a range of sub-frames [ n + T1 and n + T2], and if the data packet is allowed to be retransmitted, PSCCH and PSSCH resources used for retransmission of the data packet are randomly selected in a range of [ n + T1 and n + T2], wherein T1 and T2 are positive integers;

alternatively, the first and second electrodes may be,

and an RM resource selection mode with resource reservation is adopted, wherein the UE randomly uses frequency resources on a certain subframe within the range of subframes [ n + T1 and n + T2] for PSCCH and PSSCH transmission of initial transmission and retransmission of the current data packet, and the same frequency resources on C subframes are reserved at a specific period for PSCCH and PSSCH transmission of new data packets, wherein the value of C is randomly determined by the UE within a certain range.

37. The UE of claim 36, wherein determining the resource pool configuration information on the current working carrier comprises:

38. The UE of claim 36 or 37, wherein the configuration of the transmission resource pool of the currently active carrier comprises one or more of the following information: the method comprises the steps of a subframe set of a resource pool, a physical resource block set of the resource pool and a resource selection mode allowed by the resource pool.

39. The user equipment of claim 38, wherein:

40. The ue of claim 36, wherein selecting a pool of transmission resources comprises:

41. The UE of claim 40, wherein:

if the RM resource pool is selected as the transmission resource pool, resources are selected in an RM resource selection mode in the RM resource pool, and the UE physical layer performs incomplete channel detection from the subframe p or from the subframe p +1 when any one or more of the following conditions is met:

receiving an indication of an eNB;

42. The user equipment of claim 40, wherein:

43. The user equipment of claim 42, wherein:

44. The user equipment as recited in claim 43, wherein:

45. The user equipment of claim 40, wherein:

46. The user equipment of claim 36, wherein:

if the priority of the sending data is higher than the data priority of the resource pool configuration which allows the semi-static occupation of the resources, or the resource pool currently selected by the UE allows both RM resource selection and PS resource selection, an RM resource selection mode with resource reservation is adopted, otherwise, a single RM resource selection mode is adopted.