CN107277922B - Method and equipment for transmitting control channel and data channel in V2X communication - Google Patents

Abstract

The application provides a method for transmitting a control channel and a data channel in V2X communication, which comprises the following steps: the UE first determines a resource pool configuration of the PSCCH and an association therebetween, then determines PSCCH resources required for one or more transmissions of the PSCCH in the PSCCH resource pool or a subset of the PSCCH resource pool, further determines time-frequency domain resources for transmitting the PSCCH in the PSCCH resource pool associated with the PSCCH resource pool or in a subset of the PSCCH resource pool associated with the subset of the PSCCH resource pool, and finally the UE transmits corresponding information on the determined PSCCH and PSCCH resources. The method can meet the requirement of low time delay of V2X service, and can effectively control the implementation complexity of UE.

Description

A method and device for transmitting control channel and data channel in V2X communication

Technical Field

The present application relates to the field of mobile communication technology. Specifically, the present application relates to a method and device for sending a control channel and a data channel in V2X communication.

Background technique

At present, Device to Device (D2D) communication technology has been accepted by the 3GPP standard due to its huge potential value in the fields of public safety and general civilian communications, and some functions have been standardized in 3GPP Rel-12, including mutual discovery of D2D terminals in cell coverage scenarios and broadcast communication between D2D terminals in cell coverage (In Coverage, IC) scenarios, partial cell coverage (Partial Coverage, PC) scenarios and out of cell coverage (Out of Coverage, OC) scenarios.

Currently, the 3GPP Rel-12 standard defines two modes of D2D broadcast communication, referred to as Mode 1 and Mode 2. Mode 1 requires that the UE that sends D2D broadcast communication must be a UE (ICUE) under the coverage of a cellular network. The UE obtains the configuration information of the Mode 1 PSCCH resource pool by receiving the system broadcast signaling sent by the eNB, including the PSCCH period and the subframe position used to send the PSCCH in each period, as well as the physical resource block (PRB) position used to send the PSCCH in each subframe. When the UE supporting Mode 1 broadcast communication has data, it applies to the eNB for dedicated Mode 1 communication resources through a specific buffer status report (BSR); then, the UE detects the eNB's sidelink grant before each PSCCH period and obtains the resource position for sending the PSCCH and the PSSCH in the PSCCH period. In Mode 1, through the centralized control of the eNB, resource conflicts between different UEs can be avoided.

The UE that sends D2D broadcast communication through Mode 2 can be an ICUE or a UE (OCUE) outside the coverage of the cellular network. ICUE obtains the PSCCH resource pool and associated PSSCH resource pool configuration of Mode 2 by receiving the eNB system broadcast signaling, where the PSSCH resource pool includes the subframe position for PSSCH transmission in the associated PSCCH period, and the physical resource block position for PSSCH transmission in each subframe. In each PSCCH period, the transmission resources of PSCCH and associated PSSCH are randomly selected; OCUE determines the PSCCH resource pool and associated PSSCH resource pool configuration of Mode 2 through pre-configuration information, and the resource selection method is the same as ICUE. In the PC scenario, the Mode 2 resource pool configuration pre-configured by OCUE is related to the carrier frequency, system bandwidth and/or TDD configuration of the cell where the ICUE participating in the D2D broadcast communication is located.

In the above two D2D broadcast communication modes, the PSCCH resource pool and the PSSCH resource pool or PSSCH resources are bound one by one. In each PSCCH cycle, the PSCCH resource pool is located before the PSSCH resource pool or PSSCH resource associated with it, and there is no overlap between the two resources. In addition, all D2D terminals work in half-duplex mode, which will cause the terminals that send at the same time to be unable to receive the signals sent by the other party. In Rel-12, the above half-duplex limitation is solved by resource hopping.

In each PSCCH cycle, each PSCCH will be sent twice, and the time-frequency domain resources for the first transmission are:

The resources transferred the second time are:

Where s is the PSCCH resource index, PSCCH resource refers to one or more PRBs used for a PSCCH transmission, _Nt is the number of subframes contained in the PSCCH resource pool, _Nf is the number of PRBs contained in the PSCCH resource pool, and _Ns = _Nt -1. Through this resource hopping method, the subframe position of the second transmission resource of the PSCCH transmitted for the first time in the same subframe is offset, and the magnitude of the offset is related to the frequency domain position of the first transmission resource, thereby ensuring that the subframe position of the retransmission of the PSCCH transmitted for the first time in the same subframe is different. In addition, the two transmissions can ensure the reliability of PSCCH reception.

For PSSCH scheduled by PSCCH, it will be sent four times. The subframe positions of the four transmissions are determined by the time resource pattern (TRP). The index of the TRP used for PSSCH transmission is indicated by PSCCH. The receiving terminal determines the mapping relationship between the TRP index and TRP by receiving cell signaling or by pre-configuration. TRP is represented by a bit sequence of length N _TRP . If the subframe set used for PSSCH transmission in the PSCCH period is The TRP pattern associated with the TRP index indicated in this PSCCH is/> Then if/> Subframe l _j is used for PSSCH transmission scheduled by PSCCH. Because the subframe positions associated with different TRPs are not exactly the same, terminals using different TRPs to send PSSCH have the opportunity to receive each other's PSSCH. In addition, similar to PSCCH, four transmissions can guarantee the bit error rate of PSSCH received by the receiving end.

From the above description, we can see that in order to solve the half-duplex limitation and ensure the reception reliability, the transmission resources of PSCCH and PSSCH do not overlap, the transmission resources of PSCCH are located before the scheduled PSSCH transmission resources, and the resource hopping method used is also different from that of PSSCH transmission. Such a design is conducive to simplifying the reception complexity of the receiving end, but it also increases the PSSCH transmission delay.

Because the D2D communication standardized in 3GPP Rel-12 is mainly aimed at low-speed terminals and services with low latency sensitivity and reception reliability requirements, the implemented D2D functions are far from meeting user needs. In subsequent 3GPP versions, further enhancing the D2D functional framework has become a broad consensus among various communication terminal manufacturers and communication network equipment manufacturers. Among them, based on the current D2D broadcast communication mechanism, supporting direct low-latency and high-reliability communication between high-speed devices, between high-speed devices and low-speed devices, and between high-speed devices and stationary devices, namely V2X (Vehicle to Vehicle/Perdestrian/Infrastructure/Network), is one of the functions that need to be standardized first.

Compared with the existing D2D communication, the biggest difference of V2X communication lies in the higher latency and reliability requirements. At present, 3GPP has clearly given the minimum latency requirement of V2X as 20ms, and has clearly put forward the requirement of high reliability. However, these two requirements are not the main considerations in the design process of the existing D2D. For example, in the existing D2D communication mechanism, the absolute length of time occupied by the PSCCH resource pool may reach up to 400ms, and because the location of the data resources is always located after the PSCCH resource pool, it is difficult to guarantee the transmission delay of data in the existing D2D communication; in addition, the current number of PSCCH transmissions is two, and for multiple terminals that send PSCCH, if the first transmission or the second transmission is in the same subframe, the above terminals have a maximum of one opportunity to receive each other's PSCCH, which will seriously affect the reception reliability of PSCCH; in addition, because PSCCH may schedule multiple PSSCH transmissions in each PSCCH cycle, the reception reliability of PSSCH will be further reduced relative to the reception reliability of PSCCH.

Through the above analysis, we can see that the existing D2D communication mechanism has great deficiencies in data transmission delay and data transmission reliability, and is completely unable to meet the requirements of low delay and high reliability in V2X communication. There is currently no ideal technical solution to solve the above problems.

Summary of the invention

The purpose of this application is to solve at least one of the above technical deficiencies, and in particular to provide a method and device for transmitting PSCCH and PSSCH in V2X communication, including:

The UE first determines a resource set that can be used to send the PSCCH and a PSSCH resource set associated therewith;

The UE determines the PSCCH resources required for PSCCH transmission within the PSCCH resource set;

The UE determines the time-frequency domain resources for sending the PSSCH within the PSSCH resource set associated with the PSCCH resource set;

The UE sends corresponding information on the determined PSCCH and PSSCH resources.

Preferably, determining the set of PSCCH transmission resources and the set of PSSCH transmission resources associated therewith includes: the set of resources for transmitting PSCCH is all resources in the PSCCH resource pool, and the set of resources for transmitting PSSCH is all resources in the PSSCH resource pool. Or,

The resource set for sending PSCCH is a subset of the PSCCH resource pool, and the resource set for sending PSSCH is a subset of the PSSCH resource pool; the subframes included in the PSCCH resource pool subset and the PSSCH resource pool subset are completely identical, and the PRB positions do not overlap.

Preferably, the UE determines the PSSCH resource set associated with the current PSCCH resource pool based on multiple PSCCH resource pools that have a binding relationship with the current PSCCH resource pool, the multiple PSCCH resource pools that have a binding relationship are associated with the same PSSCH resource pool, and the subframe set of the PSSCH resource pool is the union of the subframe sets of the multiple PSCCH resource pools associated with it.

Preferably, the subframe set of the resource pool is uniquely determined by a bit map and an offset value, wherein the offset value represents the offset of the starting point of the subframe set relative to the starting point of the V2X system frame.

Preferably, the bitmap is associated with consecutive subframes that can be used for V2X communication after the offset value, and the first bit of the bitmap is associated with the starting point of the subframe set. The bitmap should be repeated multiple times until it occupies a V2X system frame period. If the length of the V2X system frame period is not an integer multiple of the bitmap length, the portion of the last repeated bitmap that exceeds a V2X system frame period should be truncated.

Preferably, the UE can adopt two transmission modes:

PSCCH and scheduled PSSCH can be sent in the same subframe, which is referred to as transmission mode 1.

Alternatively, the PSCCH is sent before the scheduled PSSCH, which is recorded as transmission mode two.

Preferably, if there is a binding relationship between the PSCCH resource pool C1 and another PSCCH resource pool C2, and C2 and the PSSCH resource pool S2 associated therewith support transmission mode one, then the subframe set of the PSSCH resource pool S1 associated with C1 can be the union of the subframe set of C1 and the subframe set of C2; and, the PRB set of S1 should be a superset of the PRB set of S2.

Preferably, the UE determines whether there are multiple available PSCCH resources in the current transmission cycle. If yes, the UE may randomly select a PSCCH resource from the multiple available PSCCH resources, or preferentially select a PSCCH resource with a nearest time position from the multiple available PSCCH resources, or preferentially select a PSCCH resource with a lowest interference level from the multiple available PSCCH resources;

The resource set used to send the PSCCH is all resources of the PSCCH resource pool. If subframe n belongs to the PSCCH resource pool selected by the UE, and the interval between subframe n and the data generation time pre-sent by the UE is less than the maximum tolerable delay of the data, then when the PSCCH resource Sc of subframe n satisfies one of the following conditions, the UE determines the PSCCH resource Sc of subframe n as an available PSCCH resource,

The UE sends the PSCCH in the PSCCH resource Sc of subframe n-P;

The UE detects that the average energy of the PSCCH resource Sc on the subframe n-iP is less than the predetermined threshold, where i∈(0,a];

The service sent by the UE belongs to a specific priority level;

Wherein P is the transmission period of the UE, and a is a specific value. Preferably, the resource set used to send the PSSCH is all resources in the PSSCH resource pool;

If a set Sd consisting of one or more PRBs in the PSSCH resource pool where subframe m is located meets one of the following conditions, the UE regards Sd as an available PSCCH resource:

The UE sends a PSSCH in resource Sd in the PSSCH resource pool of subframe m-P; and the interval between subframe m and the time when the data pre-sent by the UE is generated is less than the maximum tolerable delay of the data; and one or more PRBs in set Sd are not occupied by other UEs sending data higher than a certain priority;

The UE does not send PSSCH in resource Sd in the PSSCH resource pool of subframe m-P; moreover, the interval between subframe m and the time when the UE pre-sent data was generated is less than the maximum tolerable delay of the data; moreover, one or more PRBs in set Sd are not occupied by other UEs sending high-priority data; moreover, the UE detects that the average energy of PSCCH resource Sd on subframe m-lP is less than the pre-set threshold, where l∈(0,b];

The UE does not send PSSCH in resource Sd in the PSSCH resource pool of subframe m-P; moreover, the interval between subframe m and the time when the data pre-sent by the UE is generated is less than the maximum tolerable delay of the data; moreover, one or more PRBs in set Sd are not occupied by other UEs sending high-priority data; moreover, when some or all of the PRBs in Sd are scheduled by PSCCHs sent by other UEs, the UE detects that the power average of one or more PSCCHs scheduling the PRBs is less than a predetermined threshold;

The UE detects that the energy mean of the PSSCH resource Sd on the subframe m-lP is less than the reserved threshold, where l∈(0,b];

If the UE finds that there are available PSSCH resources in multiple subframes in the current transmission cycle, and the available PSSCH resources are sufficient to carry the data packets sent by the UE, the UE randomly selects a PSSCH resource from them, or preferentially selects the PSSCH resource with the closest time position.

Where b is a specific value.

Preferably, if the data sent by the UE is higher than the reserved priority, the time interval between the PSCCH time-frequency domain resources determined by the UE for sending the PSCCH and the PSSCH time-frequency domain resources for sending the PSSCH scheduled by the PSCCH should be greater than a predetermined value.

Preferably, the UE selecting PSCCH and PSSCH resources further includes: if the power of the UE currently sending PSCCH exceeds Pr_max_C, the UE can only select PSCCH sending resources from resources in the PSCCH resource pool except the PSCCH resource pool subset.

Preferably, for transmission mode one and transmission mode two, PSCCH is sent four times, and the subframe positions of the four transmissions are determined according to the TRP with index value I _TRP =n _{PSCCH3_1} or n _{PSCCH3_2} in the TRP set defined in Rel-12/13. For any one of the four subframes, the index of the PSCCH resource used to send PSCCH is determined according to the relative position of I _TRP in set S, wherein set S is a set consisting of N _TRP TRPs in the TRP set with the current subframe as the sending subframe.

Preferably, the UE selects the PSSCH resource including: if the current UE is in transmission mode one, the UE's PSSCH transmission times and PSCCH transmission times are the same, and the PSSCH and the PSCCH that schedules the PSSCH are transmitted in the same subframe.

Preferably, the PSCCH and PSSCH transmission modes include: for transmission mode 1, for transmission mode 1, the PRB position for transmitting the PSSCH may be indicated by eNB configuration signaling or pre-configuration information;

For transmission mode 2, the information carried by PSCCH includes at least The bits are used to indicate the subframe position of each scheduled PSSCH transmission and the PRB position occupied in each subframe, where T represents the number of PSSCH transmissions and N _PRB represents the number of PRBs in each subframe in the PSSCH resource pool.

Preferably, the PSCCH and PSSCH sending method further includes: if the UE currently adopts transmission method one, the UE should adopt PSCCH format one; if the UE currently adopts transmission method two, the UE should adopt PSCCH format two.

Preferably, the difference between the PSCCH format 1 and the PSCCH format 2 includes: the number of bits included in the PSCCH format 1 is the same as that in the PSCCH format 2, and the UE using the transmission mode 1 needs to set the specific field in the PSCCH to a fixed value.

Preferably, the UE sets the PSCCH content including:

The UE using transmission mode 1 sets the bit field used for indicating the position of each transmission subframe of the PSSCH in the PSCCH to 0 or 1. The UE using transmission mode 1 sets all the bit fields used for indicating the time-frequency resources of the PSSCH in the PSCCH to 0 or 1.

Preferably, if the PRB index i _SA for sending PSCCH is smaller than the indices of all PRBs in the PRB set of the PSSCH resource pool associated therewith, then the N _PSSCH PRB indices used for the scheduled PSSCH sending are i _SA +1, i _SA +2,…,i _SA +N _PSSCH respectively; if the PRB index i _SA for sending PSCCH is greater than the indices of all PRBs in the PRB set of the PSSCH resource pool associated therewith, then the N _PSSCH PRB indices used for the scheduled PSSCH sending are i _SA -1, i _SA -2,…,i _SA -N _PSSCH respectively.

The technical solution proposed in this application is that the UE first determines the resource pool configuration of PSCCH and PSSCH, and the association between the above two, and then the UE determines the PSCCH resources required for one or more transmissions of PSCCH in the PSCCH resource pool or in a subset of the PSCCH resource pool, and further determines the time-frequency domain resources for sending PSSCH in the PSSCH resource pool associated with the PSCCH resource pool or in a subset of the PSSCH resource pool associated with the subset of the PSCCH resource pool, and finally the UE sends the corresponding information on the determined PSCCH and PSSCH resources. Through the method of this application, the low latency requirements of V2X services can be met, and the implementation complexity of UE can be effectively controlled.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a flowchart of the UE operation of sending the present application;

FIG2 is a schematic diagram of the configuration of PSCCH and PSSCH resource subsets in the present application;

FIG3 is a schematic diagram of the corresponding relationship between a PSSCH resource pool and a PSCCH resource pool in the present application;

FIG4 is a schematic diagram of a method for configuring a subframe set of the present application;

FIG5 is a schematic diagram showing the corresponding relationship between one PSSCH resource pool and two PSSCH resource pools in the present application;

FIG6 is a schematic diagram of the relative positions of a PSCCH resource pool supporting transmission mode 1 and a PSSCH resource pool PRB set associated therewith in the present application;

FIG. 7 is a schematic diagram of the composition structure of a preferred device of the present application.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and examples.

In V2X communication, compared with the current D2D communication, there are higher requirements for data transmission delay and data transmission reliability. The current D2D communication mechanism has deficiencies in the resource allocation method and resource hopping method of PSCCH and PSSCH, and in many cases cannot meet the requirements of low delay and high reliability of V2X communication. To this end, this application proposes a PSCCH resource allocation method. For the sending UE, as shown in Figure 1, the PSCCH and PSSCH channels are sent according to the following steps:

Step 110: The UE determines the resource pools of PSCCH and PSSCH.

In this application, the UE can determine the configuration of the above two resource pools by receiving eNB signaling or by pre-configuration. From the perspective of the entire system, the PSCCH resource pool and the PSSCH resource pool occupy the same subframe, but in the same subframe, the PRB positions occupied by the PSCCH resource pool and the PSSCH resource pool are not exactly the same.

Step 120: The UE determines PSCCH resources required for one or more PSCCH transmissions in the PSCCH resource pool or in a subset of the PSCCH resource pool.

In the present application, PSCCH resources refer to the number of PRBs used for a PSCCH transmission. The same PSCCH can be sent once or multiple times. If it is sent multiple times, the resources occupied by multiple PSCCH transmissions are completely independent, or the resources occupied by multiple PSCCH transmissions are determined by a predefined or preconfigured resource pattern, and each resource pattern is associated with a unique index value.

The UE determines the subset of the resource pool by receiving eNB signaling or by pre-configuration. The resource pool subset may be associated with one or more PSCCH resources, or associated with one or more PSCCH patterns.

In the present application, the PSCCH and the scheduled PSSCH can be sent in the same subframe, or the PSCCH is always sent before the scheduled PSSCH. The former is referred to as transmission mode one in the present application, and the latter is referred to as transmission mode two.

In the case of configuring or pre-configuring a PSCCH resource pool subset, the UE can determine the transmission mode and select the location of the PSCCH resource according to the service type. For example, if the data sent by the UE belongs to the first service type, the UE adopts transmission mode one, and the UE selects PSCCH resources in the PSCCH resource pool subset. If the data sent by the UE belongs to the second service type, the UE adopts transmission mode two and selects PSCCH resources in the PSCCH resource pool. The first and second service types are defined by the standard. Specifically for the internal implementation of the UE, the service type can be determined by the service layer of the UE, and the corresponding indication is given to the UE access layer. The UE access layer selects PSCCH resources in the corresponding set (PSCCH resource pool or a subset of the PSCCH resource pool) according to the indication of the service layer (service type one or service type two).

In addition, in the present application, the UE may always send PSCCH and PSSCH according to transmission mode 1 or always send PSCCH according to transmission mode 2.

Step 130: The UE determines time-frequency domain resources for transmitting the PSSCH in a PSSCH resource pool associated with a PSCCH resource pool or in a subset of a PSSCH resource pool associated with a subset of a PSCCH resource pool.

The PSSCH resource pool associated with the PSCCH resource pool is the PSSCH resource pool in the current PSCCH cycle, or the PSSCH resource pool in the next PSCCH cycle. The subframes included in the PSCCH resource pool subset are exactly the same as the subframes included in the associated PSSCH resource pool subset.

In the present application, the same PSSCH can be sent once or multiple times. If it is sent multiple times, the resources occupied by the multiple PSSCH transmissions are completely independent, or the resources occupied by multiple PSSCH transmissions are determined by a predefined or preconfigured time domain resource pattern and frequency hopping pattern, and each time domain resource pattern is associated with a unique index value.

The UE determines the subset of the PSSCH resource pool by receiving eNB signaling or by pre-configuration.

Step 140: The UE sends the PSCCH and PSSCH on the determined resources;

In this application, the PSCCH sent by the UE should at least include the time-frequency resource indication of the PSSCH. When the PSCCH and PSSCH resource pool subset are configured or pre-configured, the PSCCH should include a transmission mode (transmission mode one or transmission mode two) associated with the PSCCH.

It should be noted that the present application does not limit the execution order of the above steps.

In order to facilitate the understanding of the present application, the above technical solution of the present application is further explained in the mode of interaction between devices in combination with specific application situations as follows:

Embodiment 1:

In this embodiment, the UE determines the PSCCH and PSSCH resource pools by receiving eNB signaling or by pre-configuration. In all cases, the UE always sends the PSCCH and PSSCH according to transmission mode 1. The specific implementation steps are as follows:

Step 210: The UE determines a PSCCH resource pool and a PSSCH resource pool associated therewith.

In this embodiment, the subframe positions of the PSCCH and PSSCH resource pools may be indicated by the same bitmap, and in each subframe, the PRB positions of the PSCCH and PSSCH resource pools do not overlap. The PSCCH resource pool is associated with the PSSCH resource pool at the same subframe position.

Step 220: The UE determines the PSCCH resources required for multiple PSCCH transmissions in the PSCCH resource pool.

In this embodiment, each PSCCH may be sent twice or four times, and the PSCCH resources where the multiple PSCCHs are sent may be completely independent of each other or determined by a predefined resource pattern.

The UE autonomously selects PSCCH resources for multiple PSCCH transmissions in the PSCCH resource pool (if the PSCCH resources where multiple PSCCH transmissions are located are completely independent), or selects resource pattern index n _PSCCH1 associated with PSCCH resources for multiple PSCCH transmissions. The UE can make autonomous selections based on one or more of the following methods, such as resource detection results, its own position, and a random resource selection mechanism. This application does not limit the way in which the UE autonomously selects PSCCH resources, the same below.

If the PSSCH is transmitted twice, at this time, the UE determines the PSCCH resource locations for the first and second transmissions of the PSCCH through the resource pattern index in the same manner as the PSCCH transmission resource determination method defined in Rel-12/13.

If the PSCCH is transmitted four times, the subframe positions of the four transmissions are determined according to the TRP of the index value I _TRP =n _PSCCH1 in the TRP set defined in Rel-12/13. For any of the above four subframes, the index of the PSCCH resource used to transmit the PSCCH is determined according to the following method:

1. Determine a set S consisting of N _TRPs in the above TRP set, with the current subframe as the transmission subframe;

2. Arrange the TRPs in set S in ascending or descending order according to their indexes, and determine the relative order of I _TRPs in set S

3. Determine the PSCCH resource index n _TRP used to send the PSCCH as:

Wherein Ns is a value determined by standard definition or central control node configuration, and Ns may be N _TRP /4; f _hop (i) is a frequency hopping factor determined by standard definition or central control node configuration, and f _hop (i) may be:

Where c(k) is a pseudo-random sequence defined by the standard.

Step 230: The UE determines the time-frequency domain resources for sending the PSSCH in the PSSCH resource pool associated with the PSCCH resource pool.

The number of times the UE sends PSSCH is the same as the number of times it sends PSCCH, and the i-th PSSCH and the i-th PSCCH are in the same subframe.

If the PSSCH is sent twice, the starting PRB position a1 of the first PSSCH transmission is selected by the UE in the first associated PSCCH transmission subframe, and the starting PRB position a2 of the second PSSCH transmission can still be selected by the UE in the second associated PSCCH transmission subframe, or determined by the following formula:

Wherein, M ^PSSCH represents the number of PRBs included in the PSSCH resource pool in each subframe.

If the PSSCH is sent four times, the starting PRB position b1 where the PSSCH is sent for the first time is obtained through eNB configuration signaling or pre-configuration signaling; the starting PRB positions where the PSSCH is sent for the next three times can also be independently selected by the UE in the corresponding subframe, or determined by the following formula:

Where 2≤i≤4.

Step 240: The UE sends the PSCCH and PSSCH on the resources determined in steps 220 and 230;

The information carried by PSCCH should at least include the starting PRB position and the number of PRBs where the current PSSCH is transmitted. In addition, if the multiple transmission resources of PSCCH are completely independent, the information carried by PSCCH should include an indication of the current PSCCH transmission number.

This concludes the present embodiment. Through the method of this embodiment, the PSCCH and the scheduled PSSCH can be sent in the same subframe. Ideally, the receiving UE can decode the PSCCH and PSSCH simultaneously in one subframe, which is beneficial to reducing the data transmission delay. However, when the reception relies on multiple PSCCH receptions and then the PSCCH is decoded by soft merging to ensure reliability, the receiving UE needs to cache the soft bit information of all PSSCHs in the corresponding subframe before successfully decoding the PSCCH, which increases the implementation complexity and cost of the UE.

Embodiment 2:

In this embodiment, the UE determines the PSCCH and PSSCH resource pools by receiving eNB signaling or by pre-configuration. In all cases, the UE always sends the PSCCH and PSSCH according to transmission mode 2. The specific implementation steps are as follows:

Step 310: The UE determines a PSCCH resource pool and a PSSCH resource pool associated therewith.

In this embodiment, the subframe positions of the PSCCH and PSSCH resource pools may be indicated by the same bitmap, and in each subframe, the PRB positions of the PSCCH and PSSCH resource pools do not overlap. In the time domain, the nth PSCCH resource pool is associated with the n+1th PSSCH resource pool.

Preferably, the time length of the PSCCH and PSSCH resource pools should be less than 50ms.

Step 320: The UE determines the PSCCH resources required for multiple PSCCH transmissions in the PSCCH resource pool.

In this embodiment, each PSCCH may be sent twice or four times, and the PSCCH resources where the multiple PSCCHs are sent may be completely independent of each other or determined by a predefined resource pattern.

The UE autonomously selects a PSCCH resource for multiple PSCCH transmissions in the PSCCH resource pool, or selects a resource pattern index n _PSCCH2 associated with a PSCCH resource for multiple PSCCH transmissions.

If the PSSCH is transmitted twice, at this time, the UE determines the PSCCH resource locations for the first and second transmissions of the PSCCH through the resource pattern index in the same manner as the PSCCH transmission resource determination method defined in Rel-12/13.

If PSCCH is transmitted four times, the subframe positions of the four transmissions are determined according to the TRP of the index value I _TRP =n _PSCCH2 in the TRP set defined in Rel-12/13. For any of the above four subframes, the index determination method of the PSCCH resource used to transmit the PSCCH is the same as step 220.

Step 330: The UE determines the time-frequency domain resources for sending the PSSCH in the PSSCH resource pool associated with the PSCCH resource pool.

In this embodiment, the UE autonomously selects time-frequency domain resources for PSSCH transmission in the associated PSSCH resource pool.

Step 340: The UE sends the PSCCH and PSSCH on the resources determined in steps 220 and 230;

The information carried by the PSCCH should at least include the subframe position of each transmission of the scheduled PSSCH and the PRB position occupied in each subframe. The number of bits occupied by the above two items is: bits, where N _PRB represents the number of PRBs contained in the current V2X communication bandwidth, and T is equal to 2 or 4, indicating the total number of PSSCH transmissions.

This is the end of this embodiment. Through the method of this embodiment, the PSCCH is always sent earlier than the scheduled PSSCH. After decoding the PSCCH, the receiving UE can receive the PSSCH according to the scheduling information indicated by the PSCCH. The UE does not need to cache all the soft bits of the PSSCH, which is conducive to reducing the implementation complexity of the UE. However, the data transmission delay of this method is relatively large.

Embodiment three:

In this embodiment, the UE determines the PSCCH and PSSCH resource pools, and the subsets within the PSCCH and/or PSSCH resource pools by receiving eNB signaling or by pre-configuration. The UE determines the PSCCH transmission resources within the PSCCH resource pool or within the subset of the PSCCH resource pool according to the service type. The specific implementation steps are as follows:

Step 410: The UE determines a PSCCH resource pool and a PSSCH resource pool associated therewith, and a subset of a PSCCH resource pool and a subset of a PSSCH resource pool associated therewith.

In this embodiment, the subframe positions of the PSCCH and PSSCH resource pools can be indicated by the same bitmap, and in each subframe, the PRB positions of the PSCCH and PSSCH resource pools do not overlap. In the time domain, the PSCCH resource pool indicated by the current bitmap is associated with the PSSCH associated resource pool indicated by the next bitmap.

In this embodiment, the subset of the PSCCH resource pool includes one or more PSCCH patterns, where the PSCCH pattern is defined by the standard. The subframes included in the PSSCH resource pool subset associated with the PSCCH resource pool subset are completely identical, and the PRB positions do not overlap, as shown in FIG2 .

The PSCCH resource pool subset may be associated with the parameter Pr_max_C configured or preconfigured by the eNB. The UE determines whether it can select resources in the PSCCH resource pool subset based on the parameter Pr_max_C associated with the resource pool subset and the current transmit power. The PSSCH resource pool subset may be associated with the parameter Pr_max_S configured or preconfigured by the eNB. The UE determines whether it can select resources in the PSSCH resource pool subset based on the parameter Pr_max_S associated with the resource pool subset and the current transmit power.

Step 420: The UE determines PSCCH resources required for one or more PSCCH transmissions in the PSCCH resource pool or in a subset of the PSCCH resource pool.

If the data sent by the UE belongs to service type 1, the UE adopts transmission mode 1 (i.e., the PSCCH and the scheduled PSSCH are sent in the same subframe), and the UE selects PSCCH transmission resources in the PSCCH resource pool subset. If the PSCCH resource pool subset contains only one PSCCH resource pattern, the UE selects the resources associated with the pattern as the PSCCH transmission resources. If the PSCCH resource pool subset contains multiple PSCCH resource pool patterns, the UE can randomly select a PSCCH resource pattern from them, and the index of the resource pattern is n _{PSCCH3_1} .

If the data sent by the UE belongs to service type 2, the UE adopts transmission mode 2 (and PSCCH is always sent before the scheduled PSSCH). If the power of the UE currently sending PSCCH does not exceed Pr_max_C, the UE can select PSCCH resources in the PSCCH resource pool; if the power of the UE currently sending PSCCH exceeds Pr_max_C, the UE can only select PSCCH transmission resources in the PSCCH resource pool except for the PSCCH resource pool subset resources. The UE can determine the transmission power of PSCCH through the open-loop power control parameters configured by the eNB or its own absolute speed, etc. This application does not limit the specific determination method of the PSCCH power. The UE can select the index n _{PSCCH3_2} of the PSCCH transmission resource associated resource pattern based on one or more of the idle resource detection results, its own position, and random resource selection.

In the present application, PSSCH can be sent twice. At this time, the way in which the UE determines the PSCCH resource location for the first and second transmissions of PSCCH through the resource pattern index is the same as the PSCCH transmission resource determination method defined in Rel-12/13.

In addition, in the present application, PSCCH can be sent four times. At this time, the subframe positions of the four transmissions are determined according to the TRP with index value I _TRP = n _{PSCCH3_1} or n _{PSCCH3_2} in the TRP set defined in Rel-12/13. For any of the above four subframes, the index of the PSCCH resource used to send PSCCH is determined according to the relative position of I _TRP in the set S, where the set S is a set of N _TRP TRPs in the TRP set with the current subframe as the sending subframe.

The specific UE is determined as follows:

1. Determine a set S consisting of N _TRPs in the above TRP set, with the current subframe as the transmission subframe;

2. Arrange the TRPs in set S in ascending or descending order according to their indexes, and determine the relative order of I _TRPs in set S

3. Based on The PSCCH resource index n _TRP used to send the PSCCH is determined by the determined frequency hopping factor defined by the standard or configured by the central control node:

Wherein Ns is a value determined by standard definition or central control node configuration, and Ns may be N _TRP /4; f _hop (i) is a frequency hopping factor determined by standard definition or central control node configuration, and f _hop (i) may be:

Where c(k) is a pseudo-random sequence defined by the standard.

Step 430: The UE determines time-frequency domain resources for transmitting the PSSCH in a PSSCH resource pool associated with a PSCCH resource pool or in a subset of a PSSCH resource pool associated with a subset of a PSCCH resource pool.

If the current UE is in transmission mode 1, the UE's PSSCH transmission times are the same as the PSCCH transmission times, and the PSSCH and the PSCCH that schedules the PSSCH are transmitted in the same subframe.

If the PSSCH is sent twice, the starting PRB position a1 where the PSSCH is sent for the first time is obtained through eNB configuration signaling or pre-configuration signaling; the starting PRB position a2 where the PSSCH is sent for the second time is determined by the following formula:

Wherein, M ^PSSCH represents the number of PRBs included in the PSSCH resource pool in each subframe.

If the PSSCH is sent four times, the starting PRB position a1 of the first PSSCH transmission is obtained through eNB configuration signaling or pre-configuration signaling; the starting PRB positions of the subsequent three PSSCH transmissions are determined by the following formula:

Where 2≤i≤4.

If the current UE is in transmission mode 2, the UE autonomously selects PSSCH resources in the PSSCH resource pool associated with the PSCCH resource pool. The UE can select PSSCH resources based on one or more of the following methods: resource detection results, its own position, random resource selection mechanism, etc.

Step 440: The UE sends the PSCCH and PSSCH on the determined resources;

In this embodiment, for transmission mode 1, the PRB position for sending the PSSCH may be indicated by eNB configuration signaling or pre-configuration information.

If the UE currently adopts transmission mode 1, the UE should adopt PSCCH format 1. If the UE currently adopts transmission mode 2, the UE should adopt PSCCH format 2.

The information that should at least be included in PSCCH format 2 is the same as step 340 in embodiment 2.

According to one implementation method of the present application, the number of bits contained in PSCCH format 1 can be the same as that in PSCCH format 2. In this case, the UE using transmission mode 1 needs to set a specific field in the PSCCH to a fixed value, for example, the bit field used to indicate the subframe position of each transmission of the PSSCH is set to 0 or 1, or, if the PRB position of the PSSCH can be indicated by eNB configuration signaling or pre-configuration information, all bit fields in the PSCCH used for PSSCH time-frequency resource indication can be set to 0 or 1.

Alternatively, the number of bits contained in PSCCH format 1 may be different from that in PSCCH format 2. For example, the PRB position of PSSCH may be indicated by eNB configuration signaling or pre-configuration information. In this case, PSCCH may not contain a bit field for indicating the PRB position of PSSCH transmission.

This is the end of this embodiment. This embodiment has the advantages of both embodiment 1 and embodiment 2. For services with high latency requirements, data transmission can be performed through transmission mode 1. Because the probability of the above services occurring in an actual V2X communication environment is small, the implementation complexity of the receiving UE will not be significantly increased. For services with low latency requirements, data transmission can be performed through transmission mode 2.

Embodiment 4:

In this embodiment, the UE determines the PSCCH and PSSCH resource pools by receiving eNB signaling or by pre-configuration. Each PSCCH resource pool is associated with a unique PSSCH resource pool, and a PSSCH resource pool can be associated with one or more PSCCH resource pools. The UE selects PSCCH resources in the corresponding PSCCH resource pool based on one or more of the information such as the transmission period, channel detection results, and the priority of the transmission service, and selects PSSCH resources in the PSSCH resource pool associated with the PSCCH resource pool based on the channel detection results. The specific implementation steps are as follows:

Step 510: The UE determines a PSCCH resource pool and a PSSCH resource pool associated therewith.

According to an implementation method of the present application (resource pool association method 1), any PSCCH resource pool is uniquely associated with a PSSCH resource pool, and vice versa. The subframe positions of the PSCCH and PSSCH resource pools can be indicated by the same bitmap, and in each subframe, the PRB positions of the PSCCH and PSSCH resource pools do not overlap, as shown in Figure 3.

Preferably, the subframe set can be uniquely determined by a bitmap and an offset value, wherein the offset value represents the offset of the starting point of the subframe set relative to the starting point of the V2X system frame. The UE determines the starting position of the V2X system frame through a synchronization source. The bitmap is associated with the consecutive subframes that can be used for V2X communication after the offset value. The first bit (or the lowest bit) of the bitmap is associated with the starting point of the subframe set. The bitmap should be repeated multiple times until it occupies a V2X system frame period. If the length of the V2X system frame period is not an integer multiple of the bitmap length, the portion of the last repeated bitmap that exceeds one V2X system frame period should be truncated, as shown in Figure 4.

According to another implementation method of the present application (resource pool association method 2), there is a binding relationship between multiple PSCCH resource pools, and multiple PSCCH resource pools with a binding relationship are associated with the same PSCCH resource pool. The number of PSCCH resource pools with a binding relationship can be 2, or greater than 2. For each PSCCH resource pool, its subframe set can be configured by the above method. In this case, the subframe set of the PSCCH resource pool is the union of the subframe sets of the multiple PSCCH resource pools associated with it, as shown in Figure 5.

Step 520: The UE determines the PSCCH resources required for one or more PSCCH transmissions in the corresponding PSCCH resource pool.

For resource pool association mode 1, the UE directly selects the PSCCH resource pool determined in step 510. For resource pool association mode 2, the UE selects the corresponding PSCCH resource pool according to the priority of the transmitted service. For example, if the pre-transmitted service is higher than a certain priority, PSCCH resource pool A is selected, otherwise PSCCH resource pool B is selected, wherein the UE can determine the corresponding relationship between the service priority and the PSCCH resource pool through standard definition or eNB configuration.

In the selected PSCCH resource pool, the UE takes P as the transmission period and semi-statically occupies the same PSCCH resource.

Preferably, if subframe n belongs to the PSCCH resource pool selected by the UE, and the interval between subframe n and the generation time of the data pre-sent by the UE is less than the maximum tolerable delay of the data, then when the PSCCH resource Sc of subframe n meets one of the following conditions, the UE regards the PSCCH resource Sc of subframe n as an available PSCCH resource,

The UE sends a PSCCH in the PSCCH resource Sc of subframe n-P; or,

The UE detects that the average energy of the PSCCH resource Sc on the subframe n-iP is less than a certain threshold, where i∈(0, a], the value of a is defined by the standard, for example, a=2; or,

The service sent by the UE belongs to a certain priority, which is defined by the standard. For example, if the service sent by the UE belongs to the highest priority, the UE can select any PSCCH resource.

Preferably, if the service priority corresponding to the PSCCH resource pool to which subframe n belongs is higher than the service priority pre-sent by the UE, and the interval between subframe n and the data generation time pre-sent by the UE is less than the maximum tolerable delay of the data, then when the PSCCH resource Sc of subframe n satisfies the following conditions, the UE regards the PSCCH resource Sc of subframe n as an available PSCCH resource:

The UE detects that the average energy of the PSCCH resource Sc on the subframe n-iP is less than a certain threshold, where i∈(0, a], the value of a is defined by the standard, for example, a=2; and the UE transmit power is less than a threshold defined by a certain standard.

Preferably, if the service priority corresponding to the PSCCH resource pool to which subframe n belongs is lower than the service priority pre-sent by the UE, and the interval between subframe n and the data generation time pre-sent by the UE is less than the maximum tolerated delay of the data, then the UE can regard all PSCCH resources Sc of subframe n as available PSCCH resources.

If the UE finds multiple available PSCCH resources in the current transmission cycle, the UE may randomly select a PSCCH resource therefrom, or give priority to a PSCCH resource with a closest time position, or give priority to a PSCCH resource with a lowest interference level.

Preferably, the length of the sending period is an integer multiple of the length of the bitmap used for configuring the resource pool subframe set in step 510 .

Step 530: The UE determines the time-frequency domain resources for sending the PSSCH in the PSSCH resource pool associated with the PSCCH resource pool.

In this embodiment, the UE takes P as the transmission period and semi-statically occupies the same PSSCH resource. Preferably, if a set Sd consisting of one or more PRBs in the PSSCH resource pool where the subframe m is located satisfies one of the following conditions, the UE regards Sd as an available PSCCH resource:

The UE sends a PSSCH in resource Sd in the PSSCH resource pool of subframe m-P; moreover, the interval between subframe m and the time when the data pre-sent by the UE is generated is less than the maximum tolerable delay of the data; moreover, one or more PRBs in set Sd are not occupied by other UEs sending high-priority data;

or:

The UE does not send PSSCH in resource Sd in the PSSCH resource pool of subframe m-P; moreover, the interval between subframe m and the generation time of data pre-sent by the UE is less than the maximum tolerable delay of the data; moreover, one or more PRBs in set Sd are not occupied by other UEs sending high-priority data; moreover, the UE detects that the average energy of PSCCH resource Sd on subframe m-lP is less than a certain threshold, where l∈(0,b], the value of b is defined by the standard, for example, b＝2;

or:

The UE does not send PSSCH in resource Sd in the PSSCH resource pool of subframe m-P; moreover, the interval between subframe m and the time when the data pre-sent by the UE is generated is less than the maximum tolerable delay of the data; moreover, one or more PRBs in set Sd are not occupied by other UEs sending high-priority data; moreover, when some or all of the PRBs in Sd are scheduled by PSCCHs sent by other UEs, the UE detects that the power average of one or more PSCCHs scheduling the PRBs is less than a certain threshold;

or:

The UE detects that the average energy of the PSSCH resource Sd on the subframe m-lP is less than a certain threshold, where l∈(0, b], and the value of b is defined by the standard, for example, b=2.

If the UE finds that there are available PSSCH resources in multiple subframes in the current transmission cycle, and the available PSSCH resources are sufficient to carry the data packets sent by the UE, the UE randomly selects a PSSCH resource from them, or preferentially selects the PSSCH resource with the closest time position.

In addition, if the data sent by the UE has a higher priority than that defined by a certain standard, in order to give the UE sending low-priority services sufficient time to decode the PSCCH sent by the UE, the time interval between the PSCCH sent by the UE and the scheduled PSSCH should be greater than a specific value defined by a certain standard, for example greater than 2.

Step 540: The UE sends the PSCCH and PSSCH on the determined resources;

The PSCCH shall contain one or more of the following information fields:

1. The subframe position of the scheduled PSSCH;

2. The PRB position occupied by the scheduled PSSCH;

3. Modulation and coding scheme of the scheduled PSSCH;

4. Send UE ID;

5. Send TB index;

6. Current TB sending times;

7. The priority of the services carried in PSSCH;

The subframe position of the scheduled PSSCH can be in the same subframe or different subframe as the PSCCH. If it is the former, it is transmission mode 1, otherwise it is transmission mode 2. The index of the transmitted TB is used to distinguish different transmitted TBs, and the number of transmissions of the current TB is used to indicate the transmission of the currently scheduled PSSCH for the current TB.

This concludes the present embodiment. In this embodiment, services of different priorities can share the same PSCCH resource pool to avoid wasting PSCCH resources, or high-priority services can occupy a separate PSCCH resource pool, thereby avoiding the impact of low-priority services on high-priority services. Services of different priorities share the same PSSCH resource pool, and the UE that sends high-priority services indicates the occupied PSSCH position through the PSCCH. After detecting the above PSCCH, the UE that sends low-priority services should avoid selecting the PSSCH resources scheduled by the PSCCH. This method can avoid wasting resources in the PSCCH resource pool and the PSSCH resource pool, while protecting the transmission of high-priority services.

Embodiment five:

In this embodiment, PSCCH and scheduled PSSCH can be sent in the same subframe. At this time, the frequency domain resources of the two must be continuous. This method is called transmission method one. PSCCH and scheduled PSSCH can also be sent in different subframes. This method is called transmission method two. The UE determines the PSCCH and PSSCH resource pools by receiving eNB signaling or through pre-configuration. Each PSCCH resource pool is associated with a unique PSSCH resource pool. The UE needs to further determine the transmission mode supported by the current PSCCH resource pool and the PSSCH resource pool associated with it. A PSSCH resource pool can be associated with one or more PSCCH resource pools. The UE selects PSCCH resources in the corresponding PSCCH resource pool based on one or more of the information such as the transmission period, channel detection results, and the priority of the transmission service, and selects PSSCH resources in the PSSCH resource pool associated with the PSCCH resource pool based on the channel detection results. The specific implementation steps are as follows:

Step 610: The UE determines a PSCCH resource pool and a PSSCH resource pool associated therewith.

In this embodiment, there is a binding relationship between multiple PSCCH resource pools, and multiple PSCCH resource pools with a binding relationship are associated with the same PSSCH resource pool. The number of PSCCH resource pools with a binding relationship may be 2, or greater than 2. For each PSCCH resource pool and the PSSCH resource pool associated therewith, if transmission mode 1 is supported, the subframe set of the PSCCH resource pool and the PSSCH resource pool associated therewith is the same, and can be configured by the subframe set configuration method of resource pool association mode 1 in embodiment 4. The PRBs contained in the PRB sets of the above two resource pools are continuous in the frequency domain, and the union of the above two PRB sets may contain two continuous PRBs, wherein each N _SA (i.e., N _SA located at both ends) PRB with the highest index value and the lowest index value belongs to the PSCCH resource pool, wherein N _SA is the number of PRBs used for one SA transmission defined by the standard, for example, N _SA = 2, as shown in FIG6.

If there is a binding relationship between PSCCH resource pool C1 and another PSCCH resource pool C2, and C2 and the associated PSSCH resource pool S2 support transmission mode 1, then the subframe set of PSSCH resource pool S1 associated with C1 can be the union of the subframe set of C1 and the subframe set of C2. Moreover, the PRB set of S1 should be a superset of the PRB set of S2.

Step 620: The UE determines the PSCCH resources required for one or more PSCCH transmissions in the corresponding PSCCH resource pool.

In this embodiment, the UE may select a PSCCH resource in a PSCCH resource pool according to the channel detection result, or the position of the selected PSSCH resource (in this case, step 630 should be performed first), or randomly.

Step 630: The UE determines the time-frequency domain resources for sending the PSSCH in the PSSCH resource pool associated with the PSCCH resource pool.

In this embodiment, the method for the UE to select PSSCH resources is the same as step 530 in the fourth embodiment.

Step 640: The UE sends the PSCCH and PSSCH on the determined resources;

If the current PSCCH and the associated PSSCH support transmission mode 1, the PSCCH shall contain one or more of the following information fields:

1. The number of PRBs occupied by the scheduled PSSCH N _PSSCH ;

2. The modulation and coding scheme of the scheduled PSSCH;

3. Send UE ID;

4. Send the index of TB;

5. Current TB sending times;

6. The priority of the services carried in PSSCH;

If the PRB index i _SA for sending PSCCH is less than the indexes of all PRBs in the PRB set of the PSSCH resource pool associated therewith, the N _PSSCH PRB indexes used for the scheduled PSSCH transmission are i _SA +1, i _SA +2,…,i _SA +N _PSSCH respectively. Conversely, if the PRB index i _SA for sending PSCCH is greater than the indexes of all PRBs in the PRB set of the PSSCH resource pool associated therewith, the N _PSSCH PRB indexes used for the scheduled PSSCH transmission are i _SA -1, i _SA -2,…,i _SA -N _PSSCH respectively.

If the current PSCCH and the associated PSSCH support transmission mode 2, the PSCCH shall contain one or more of the following information fields:

1. The subframe position of the scheduled PSSCH;

2. The PRB position occupied by the scheduled PSSCH;

3. Modulation and coding scheme of the scheduled PSSCH;

4. Send UE ID;

5. Send TB index;

6. Current TB sending times;

The priority of the services carried in PSSCH;

This is the end of this embodiment. In this embodiment, if the PSCCH and the PSCCH resource pool associated therewith support transmission mode 1, the PRB for sending the PSCCH and the PRB for sending the PSSCH are required to be continuous in the frequency domain, which may easily lead to fragmentation of frequency domain resources. This problem can be effectively avoided by sharing the PSSCH resource pool with the PSCCH resource pool supporting transmission mode 2.

The present application also discloses a V2X control channel and data channel transmission device, the composition structure of which is shown in FIG7 , including: a resource determination module and an information transmission module, wherein:

A resource determination module, used to determine PSCCH transmission resources and associated PSSCH transmission resources;

The information sending module is used to send corresponding information on the determined PSCCH sending resources and PSSCH sending resources.

A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

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

The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims (13)

1. A method performed by a terminal in a communication system, comprising:

Receiving information for physically bypassing a shared channel PSSCH resource pool from a base station;

determining the PSSCH resource pool based on the information;

determining at least one PSSCH resource in the PSSCH resource pool based on measurements of one or more PSSCH resources in the PSSCH resource pool;

Determining a physical bypass control channel, PSCCH, resource, wherein the PSCCH resource is included in a subframe in which the determined PSCCH resource is located; and

Transmitting the PSCCH on the determined PSCCH resource and transmitting the PSSCH on the determined PSSCH resource;

wherein the information includes a bit map associated with the PSSCH resource pool.

2. The method of claim 1, wherein the information about the PSSCH resource pool is received in a system message.

3. The method of claim 1, wherein the information indicated in the PSCCH comprises information about a location of a PSSCH resource.

4. The method of claim 3, wherein the information indicated in the PSCCH further comprises at least one of priority information related to the PSSCH or information indicating whether the PSSCH is a retransmission.

5. The method of claim 1, wherein the bit map is repeated within a system frame period.

6. The method of claim 1, further comprising:

the UE determines a resource set for sending PSCCH and a PSSCH resource set associated with the PSCCH, wherein the PSSCH resource set associated with the PSSCH is the resource set for sending PSSCH;

the UE determines at least one PSSCH resource in the PSSCH resource set;

and the UE transmits corresponding information on the determined PSSCH resource.

7. The method of claim 6, wherein the set of resources for transmitting PSCCHs is a subset of a PSCCH resource pool, the set of PSSCH resources associated therewith is a subset of the PSSCH resource pool; the subset of the PSCCH resource pool and the subset of the PSCCH resource pool comprise identical subframes.

8. The method of claim 7, wherein the subset of PSCCH resource pools and the subset of PSSCH resource pools contain identical subframes and PRB locations do not overlap.

9. The method of claim 6, wherein the set of subframes of the PSSCH resource pool is determined based on the bit map and an offset value, wherein the offset value represents an offset of a start of a set of subframes relative to a V2X system frame start.

10. The method of claim 9, wherein the bit map is associated with subframes available for V2X communication consecutively after the offset value, a first bit of the bit map being associated with a start of a set of subframes, the bit map being repeated a plurality of times until occupying one V2X system frame period, and if a length of the V2X system frame period is not an integer multiple of a length of the bit map, a portion of the last repeated bit map exceeding one V2X system frame period being truncated.

11. The method of claim 6, wherein the UE transmitting the corresponding information on the determined PSSCH resource comprises:

the UE transmits PSCCH and PSSCH scheduled by the PSCCH in the same subframe;

Or the UE transmits the PSCCH before transmitting the PSCCH scheduled by the PSCCH.

12. The method of claim 6, wherein if a set Sd of one or more PRBs within a PSSCH resource pool in which subframe m is located satisfies one of the following conditions, the UE treats the Sd as an available PSCCH resource:

The UE does not send PSSCH in the resource Sd in the PSSCH resource pool of the subframe m-P; moreover, the interval between the subframe m and the data generation time of the UE pre-transmission is smaller than the maximum tolerance time delay of the data; moreover, one or more PRBs within the set Sd are not occupied by other UEs transmitting high priority data;

the UE does not send PSSCH in the resource Sd in the PSSCH resource pool of the subframe m-P; moreover, the interval between the subframe m and the data generation time of the UE pre-transmission is smaller than the maximum tolerance time delay of the data; moreover, one or more PRBs within the set Sd are not occupied by other UEs transmitting high priority data; moreover, when some or all PRBs in the Sd are scheduled by PSCCH transmitted by other UE, the UE detects that the power average value of one or more PSCCHs for scheduling the PRBs is smaller than a reservation threshold;

if the UE finds that there are PSSCH resources available for multiple subframes in the current transmission period, and the available PSCCH resources are sufficient to carry data packets sent by the UE, the UE randomly selects PSSCH resources from the PSSCH resources.

13. A terminal device, the terminal device comprising:

A memory storing computer-executable instructions; and

A processor;

Wherein the computer executable instructions, when executed by the processor, cause the processor to perform the method of any of claims 1 to 12.