CN108632004B - Method and device for data transmission using multiple transmission time intervals - Google Patents

Method and device for data transmission using multiple transmission time intervals Download PDF

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CN108632004B
CN108632004B CN201710294132.3A CN201710294132A CN108632004B CN 108632004 B CN108632004 B CN 108632004B CN 201710294132 A CN201710294132 A CN 201710294132A CN 108632004 B CN108632004 B CN 108632004B
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CN108632004A (en
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李迎阳
张世昌
王轶
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Samsung Electronics Co Ltd
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0003Two-dimensional division
    • H04L5/0005Time-frequency
    • H04L5/0007Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0091Signalling for the administration of the divided path, e.g. signalling of configuration information
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/04Wireless resource allocation
    • H04W72/044Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453Resources in frequency domain, e.g. a carrier in FDMA
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00Reducing energy consumption in communication networks
    • Y02D30/70Reducing energy consumption in communication networks in wireless communication networks

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Abstract

本申请提出了一种利用多种传输时间间隔TTI进行数据传输的方法,其特征在于,包括:用户设备UE在一个资源池上基于多种TTI长度在检测窗口内检测其他UE的调度授权SA,基于该SA测量调度的数据信道的接收功率,并检测各子帧的各子信道的接收能量;UE基于上述检测到的所述SA、接收功率以及接收能量,选择用于数据传输的资源;UE传输SA指示所述选择的资源,并通过该资源进行数据传输。采用本发明的方法,尽量避免采用不同长度TTI的UE之间的碰撞,提高资源利用率,保证不同长度TTI的传输性能。

Figure 201710294132

The present application proposes a method for data transmission using multiple transmission time intervals (TTIs), which is characterized by comprising: a user equipment UE detects scheduling grant SAs of other UEs within a detection window based on multiple TTI lengths on a resource pool, and based on The SA measures the received power of the scheduled data channel, and detects the received energy of each sub-channel of each subframe; the UE selects resources for data transmission based on the detected SA, the received power and the received energy; the UE transmits The SA indicates the selected resource, and data transmission is performed through the resource. By adopting the method of the present invention, collision between UEs using TTIs of different lengths is avoided as much as possible, resource utilization is improved, and transmission performance of TTIs of different lengths is guaranteed.

Figure 201710294132

Description

利用多种传输时间间隔进行数据传输的方法及设备Method and device for data transmission using multiple transmission time intervals

技术领域technical field

本发明涉及无线通信系统技术,特别涉及在V2X系统中利用多种不同的长度的传输时间间隔(TTI)进行数据传输的方法及设备。The present invention relates to wireless communication system technology, and in particular, to a method and device for data transmission using transmission time intervals (TTIs) of various lengths in a V2X system.

背景技术Background technique

在3GPP标准化组织的基于长期演进(LTE)的V2X(Vehicle to Vehicle/Perdestrian/Infrastructure/Network)系统中,有两种配置PSCCH资源池和PSSCH资源池的结构。PSCCH可以和其调度的一个PSSCH位于同一个子帧;或者,PSCCH也可以和其调度的任何一个PSSCH都不位于同一个子帧。PSCCH资源池和PSSCH资源池是占用相同的子帧集合。一个PSCCH固定映射到2个PRB(资源块)上。频率资源的分配粒度是子信道(sub-channel),一个子信道包含连续的PRB,其PRB个数是用高层信令配置的。一个设备的资源可以是占用一个或者多个连续的子信道。当PSCCH和PSSCH位于同一个子帧时,PSCCH和PSSCH可以是占用连续的PRB。在一个设备的资源占用一个或者多个连续的子信道中,两个PRB,例如,频率最低的两个PRB用于承载PSCCH,而其他PRB用于承载PSSCH。PSSCH的实际占用的PRB个数还需要满足是2、3和5的幂。当PSCCH和PSSCH位于同一个子帧时,PSCCH的PRB和PSSCH的PRB也可以不连续的。这时,可以是分别配置PSCCH资源池和PSSCH资源池的起始PRB位置。PSSCH资源池仍然是以子信道为粒度分配资源。对一个设备,其占用的PSCCH的索引和占用的PSSCH的最小子信道索引相等。In the Long Term Evolution (LTE)-based V2X (Vehicle to Vehicle/Perdestrian/Infrastructure/Network) system of the 3GPP standardization organization, there are two structures for configuring the PSCCH resource pool and the PSSCH resource pool. The PSCCH may be located in the same subframe as a PSSCH scheduled by it; alternatively, the PSCCH may not be located in the same subframe as any PSSCH scheduled by the PSCCH. The PSCCH resource pool and the PSSCH resource pool occupy the same set of subframes. One PSCCH is fixedly mapped to 2 PRBs (resource blocks). The allocation granularity of frequency resources is sub-channel, one sub-channel contains consecutive PRBs, and the number of PRBs is configured by high-layer signaling. The resources of a device may occupy one or more consecutive sub-channels. When the PSCCH and the PSSCH are located in the same subframe, the PSCCH and the PSSCH may occupy consecutive PRBs. In one or more consecutive subchannels occupied by the resources of one device, two PRBs, for example, the two PRBs with the lowest frequency are used to carry PSCCH, and the other PRBs are used to carry PSSCH. The actual number of PRBs occupied by the PSSCH also needs to be a power of 2, 3 and 5. When the PSCCH and the PSSCH are located in the same subframe, the PRBs of the PSCCH and the PRBs of the PSSCH may also be discontinuous. At this time, the starting PRB positions of the PSCCH resource pool and the PSSCH resource pool may be configured respectively. The PSSCH resource pool still allocates resources with sub-channel granularity. For a device, the index of the occupied PSCCH is equal to the minimum subchannel index of the occupied PSSCH.

在V2X系统中,可以是基于检测(Sensing)来解决碰撞问题和带内泄露问题。这里的一个基本假设是设备对资源的占用是半持久调度(SPS)的,即设备占用的资源在一段时间内是周期性的。如图1所示,记设备选择PSCCH/PSSCH资源的时刻为子帧n,设备首先在从子帧n-a到子帧n-b的时间段检测其资源池中的资源,判断哪些时频资源被占用和哪些时频资源是空闲的;然后在子帧n选择PSCCH/PSSCH资源,记PSCCH在子帧n+c传输,PSSCH在子帧n+d传输,预留资源是在子帧n+e;接下来,在子帧n+c传输PSCCH,在子帧n+d传输PSSCH,并在预留资源是在子帧n+e传输下一个PSSCH。特别地,当c等于d时,PSCCH和PSSCH位于同一个子帧。子帧n+e和子帧n+d的间隔等于预留间隔P。预留间隔P等于Pstep·k,例如,Pstep等于100,即支持不超过约100ms的时延,k的取值范围可以是从1到10的所有整数的集合或者其子集,k的取值范围可以是高层配置的。在执行资源选择时,设备可以是选择K个位于不同子帧的资源,即每一个数据可以是重复发送K次,K大于或等于1,例如K等于2,从而避免因为半双工操作的限制导致一部分设备无法接收这个数据。当K大于1时,每一个PSSCH可以是指示上述全部K个资源。In the V2X system, the collision problem and the in-band leakage problem can be solved based on Sensing. A basic assumption here is that the resource occupation by the device is semi-persistent scheduling (SPS), that is, the resources occupied by the device are periodic within a period of time. As shown in Figure 1, the moment when the device selects the PSCCH/PSSCH resource is subframe n. The device first detects the resources in its resource pool in the time period from subframe na to subframe nb, and determines which time-frequency resources are occupied and Which time-frequency resources are free; then select PSCCH/PSSCH resources in subframe n, note that PSCCH is transmitted in subframe n+c, PSSCH is transmitted in subframe n+d, and reserved resources are in subframe n+e; then Next, the PSCCH is transmitted in subframe n+c, the PSSCH is transmitted in subframe n+d, and the next PSSCH is transmitted in subframe n+e in the reserved resource. In particular, when c is equal to d, PSCCH and PSSCH are located in the same subframe. The interval between subframe n+e and subframe n+d is equal to the reserved interval P. The reserved interval P is equal to P step ·k. For example, P step is equal to 100, that is, it supports a delay of no more than about 100ms. The value range of k can be the set of all integers from 1 to 10 or a subset thereof. The value of k The value range can be configured by high-level. When performing resource selection, the device can select K resources located in different subframes, that is, each data can be repeatedly sent K times, and K is greater than or equal to 1, for example, K is equal to 2, so as to avoid the limitation of half-duplex operation. As a result, some devices cannot receive this data. When K is greater than 1, each PSSCH may indicate all the above K resources.

如图2所示是基于检测执行资源选择的流程图。假设在子帧n执行资源选择,设备当前的预留资源的预留间隔为PA,并且需要预留资源的周期数为C。设备可以是在选择窗口[n+T1,n+T2]内选择资源并且以间隔PA连续预留C个周期。T1和T2依赖于UE的实现,例如,T1≤4,20≤T2≤100。T1依赖于UE从选择资源到可以开始发送调度分配信令(SA)和数据的处理时延的影响,T2主要是依赖于当前业务可以容忍的时延特性。首先,设置选择窗口内的所有资源都在集合SA中(201)。接下来,根据正确接收的SA,假设SA指示资源在子帧n之后继续预留,测量SA调度的数据信道的接收功率,当接收功率超过相应的门限时,排除SA的一部分候选资源(202)。具体的说,当接收功率超过相应的门限时,根据SA在子帧n之后预留的资源Y不可用,上述门限是根据执行资源选择的设备的优先级和上述正确接收的SA指示的优先级联合确定。记Rx,y代表选择窗口[n+T1,n+T2]内的一个单子帧资源,Rx,y位于子帧y,并且包含从子信道x开始的一个或者多个连续的子信道,则,当

Figure BDA0001282637760000021
的PRB与上述资源Y的PRB重叠时,Rx,y对设备A不可用,即从集合SA排除Rx,y,j=0,1,...C-1,C是设备A当前需要按照周期PA预留资源的周期数。接下来,判断SA的剩余资源是否达到总资源的比特R,例如20%(203)。如果比例小于R,则把门限升高3dB(204)并重新从步骤201开始执行;否则,继续执行步骤205。在步骤205中,是估计上述SA的剩余资源的接收能量,把接收能量最小的资源移动到集合SB,直到SB的资源的比例为R。对一个包含多个子信道的资源,这个资源的接收能量是其包含的各个子信道上的接收能量的平均值。接下来,从SB的资源中选择用于数据传输的资源(206)并用于数据传输(207)。这里,当一个数据是传输两次时,UE首先在SB内选择一个用于数据传输的资源,然后,在满足时延要求并在SA的指示范围之内,如果存在可用的资源,则UE选择另一个用于数据传输的资源。Figure 2 is a flow chart of performing resource selection based on detection. Assuming that resource selection is performed in subframe n, the current reservation interval of the device's reserved resources is P A , and the number of cycles that need to reserve resources is C. The device may select resources within the selection window [n+T 1 , n+T 2 ] and reserve C consecutive cycles at interval PA. T1 and T2 depend on the implementation of the UE , eg, T1≤4 , 20≤T2≤100 . T 1 depends on the influence of the processing delay from the time when the UE selects resources to when it can start sending scheduling allocation signaling (SA) and data, and T 2 mainly depends on the delay characteristics that can be tolerated by the current service. First, all resources within the set selection window are in set SA (201). Next, according to the correctly received SA, it is assumed that the SA indicates that resources continue to be reserved after subframe n, the received power of the data channel scheduled by the SA is measured, and when the received power exceeds the corresponding threshold, a part of the candidate resources of the SA is excluded (202 ). Specifically, when the received power exceeds a corresponding threshold, the resource Y reserved after subframe n according to SA is unavailable. The above threshold is based on the priority of the device performing resource selection and the priority indicated by the correctly received SA. Jointly determined. Let R x,y represent a single subframe resource within the selection window [n+T 1 ,n+T 2 ], R x,y is located in subframe y, and includes one or more consecutive subframes starting from subchannel x channel, then, when
Figure BDA0001282637760000021
When the PRB of the resource Y overlaps with the PRB of the above resource Y, R x,y is unavailable to device A, that is, R x, y is excluded from the set S A , j=0,1,...C-1, C is the current device A The number of cycles for which resources need to be reserved according to the cycle PA. Next, it is judged whether the remaining resources of SA reach the bit R of the total resources, eg, 20% (203). If the ratio is less than R, the threshold is raised by 3dB (204) and the execution starts from step 201; otherwise, the execution of step 205 is continued. In step 205, the received energy of the remaining resources of SA is estimated, and the resource with the smallest received energy is moved to the set SB until the ratio of the resources of SB is R. For a resource containing multiple sub-channels, the received energy of this resource is the average value of the received energy on each sub-channel it contains. Next, a resource for data transmission is selected from the resources of SB (206) and used for data transmission (207). Here, when a piece of data is transmitted twice, the UE first selects a resource for data transmission in S B , and then, if the delay requirement is met and within the range indicated by SA, if there are available resources, the UE will Select another resource for data transfer.

为了增强V2X系统的性能,一个方向是采用更短的传输时间间隔(TTI)。短TTI(sTTI)有利于降低传输时延,并且,sTTI有利于规避半双工导致的不能接收其他UE的数据的问题。如何有效支持一个UE在多个载波上的数据传输是亟待解决的问题。To enhance the performance of V2X systems, one direction is to use shorter transmission time intervals (TTIs). Short TTI (sTTI) is beneficial to reduce transmission delay, and sTTI is beneficial to avoid the problem of inability to receive data from other UEs caused by half-duplex. How to effectively support the data transmission of one UE on multiple carriers is an urgent problem to be solved.

发明内容SUMMARY OF THE INVENTION

本申请提供了一种利用多种传输时间间隔进行数据传输的方法和设备,提供了sTTI的映射结构,资源池配置策略、资源分配机制和资源选择过程,从而提高UE的传输性能。The present application provides a method and device for data transmission using multiple transmission time intervals, and provides sTTI mapping structure, resource pool configuration strategy, resource allocation mechanism and resource selection process, thereby improving UE transmission performance.

为实现上述目的,本申请采用如下的技术方案:To achieve the above object, the application adopts the following technical solutions:

一种利用多种传输时间间隔TTI进行数据传输的方法,其特征在于,包括:A method for data transmission using multiple transmission time intervals TTI, comprising:

用户设备UE在一个资源池上基于多种TTI长度在检测窗口内检测其他UE的调度授权SA,基于该SA测量调度的数据信道的接收功率,并检测各子帧的各子信道的接收能量;The user equipment UE detects the scheduling grant SA of other UEs within the detection window based on multiple TTI lengths on a resource pool, measures the received power of the scheduled data channel based on the SA, and detects the received energy of each subchannel of each subframe;

UE基于上述检测到的所述SA、接收功率以及接收能量,选择用于数据传输的资源;The UE selects resources for data transmission based on the SA, received power and received energy detected above;

UE传输SA指示所述选择的资源,并通过该资源进行数据传输。The UE transmits the SA indicating the selected resource, and performs data transmission through the resource.

较佳地,一个长TTI(lTTI)划分多个短TTI(sTTI),在每个sTTI的开始部分设置自动增益控制AGC,并在结束部分设置间隔GAP,sTTI的AGC和GAP与lTTI长度相等;或者,第一个sTTI的AGC与lTTI长度相同,最后一个sTTI的GAP与lTTI相同,sTTI其他AGC和/或GAP比lTTI长度短。Preferably, a long TTI (lTTI) is divided into a plurality of short TTIs (sTTI), the automatic gain control AGC is set at the beginning of each sTTI, and the interval GAP is set at the end part, and the AGC and GAP of the sTTI are equal to the length of the lTTI; Alternatively, the AGC of the first sTTI is the same length as the 1TTI, the GAP of the last sTTI is the same as the 1TTI, and the other AGCs and/or GAPs of the sTTI are shorter than the 1TTI length.

较佳地,一个lTTI划分多个sTTI,每个sTTI的开始部分设置AGC,但是仅在最后一个sTTI的结束部分设置GAP,所述GAP与lTTI的GAP长度相同,sTTI的AGC与lTTI长度相等;或者,第一个sTTI的AGC与lTTI长度相同,其他sTTI的AGC比lTTI长度短。Preferably, one 1TTI is divided into multiple sTTIs, and AGC is set at the beginning of each sTTI, but GAP is only set at the end of the last sTTI, and the GAP is the same length as the GAP of the 1TTI, and the AGC of the sTTI is equal to the length of the 1TTI; Alternatively, the AGC of the first sTTI is the same length as the lTTI, and the AGC of the other sTTIs is shorter than the lTTI length.

较佳地,一个lTTI划分多个sTTI,第一个sTTI设置AGC并与lTTI相同,最后一个sTTI设置GAP并与lTTI相同,在相邻两个sTTI之间插入较短的GAP和AGC。Preferably, one lTTI is divided into multiple sTTIs, the first sTTI is set with AGC and is the same as the lTTI, the last sTTI is set with GAP and is the same as the lTTI, and a shorter GAP and AGC are inserted between two adjacent sTTIs.

较佳地,一个lTTI划分多个sTTI,sTTI的第一个和最后一个OFDM符号都是每隔N个子载波在一个子载波上传输数据,N是常数。Preferably, one lTTI is divided into multiple sTTIs, and the first and last OFDM symbols of the sTTI transmit data on one subcarrier every N subcarriers, where N is a constant.

较佳地,基于多种长度的TTI进行数据传输时,资源池按照lTTI配置。Preferably, when data transmission is performed based on TTIs of various lengths, the resource pool is configured according to 1 TTI.

较佳地,基于多种长度的TTI进行数据传输时,资源池每种长度的TTI分别配置。Preferably, when data transmission is performed based on TTIs of multiple lengths, TTIs of each length in the resource pool are configured separately.

较佳地,假设sTTI的SA占用频率资源是lTTI的m倍,第q个sTTI的SA占用lTTI的SA资源q+[0,1,...m-1],q=0,1,...M-1,M=N-m+1,N是lTTI数据子信道的个数。Preferably, it is assumed that the frequency resource occupied by the SA of the sTTI is m times that of the 1TTI, and the SA of the qth sTTI occupies the SA resource q+[0,1,...m-1] of the 1TTI, q=0,1,... .M-1, M=N-m+1, N is the number of 1TTI data sub-channels.

较佳地,假设sTTI的SA占用频率资源是lTTI的m倍,第q个sTTI的SA占用lTTI的SA资源q·m+[0,1,...m-1]+Δ1,q=0,1,...,M-1,

Figure BDA0001282637760000041
第q个sTTI数据子信道占用lTTI数据子信道q·m+[0,1,...m-1]+Δ2,Δ1和Δ2是资源位置的参数,N是lTTI数据子信道的个数。Preferably, it is assumed that the frequency resource occupied by the SA of the sTTI is m times that of the 1TTI, and the SA of the qth sTTI occupies the SA resource of the 1TTI q·m+[0,1,...m-1]+Δ 1 , q=0 ,1,...,M-1,
Figure BDA0001282637760000041
The qth sTTI data subchannel occupies the lTTI data subchannel q·m+[0,1,...m-1]+Δ 2 , where Δ 1 and Δ 2 are the parameters of the resource location, and N is the number of the lTTI data subchannels number.

较佳地,在接收不同长度TTI的SA时,对不同的TTI长度,PSSCH-RSRP的门限不同;或者,记PSSCH-RSRP门限为Th,把PSSCH-RSRP与Th+Δ比较判断资源是否可用,Δ是功率调节参数;或者,把PSSCH_RSRP+Δ与门限比较判断资源是否可用,PSSCH_RSRP是数据信道的接收功率,Δ是功率调节参数。Preferably, when receiving SAs with TTIs of different lengths, the thresholds of PSSCH-RSRP are different for different TTI lengths; or, denoting the PSSCH-RSRP threshold as Th, compare PSSCH-RSRP with Th+Δ to determine whether the resources are available, Δ is a power adjustment parameter; or, compare PSSCH_RSRP+Δ with a threshold to determine whether the resource is available, PSSCH_RSRP is the received power of the data channel, and Δ is a power adjustment parameter.

较佳地,按照lTTI测量接收能量S-RSSI时,测量除lTTI的AGC和GAP符号以外的其他符号的接收能量;或者,测量除lTTI的AGC和GAP符号以外的所有不会用于GAP的符号的接收能量;或者,一个lTTI资源划分为多个sTTI资源,首先测量各个sTTI资源的S-RSSI,然后,根据各个sTTI资源的S-RSSI得到所述lTTI资源的S-RSSI。Preferably, when measuring the received energy S-RSSI according to 1TTI, measure the received energy of other symbols except the AGC and GAP symbols of 1TTI; or, measure all symbols that will not be used for GAP except the AGC and GAP symbols of 1TTI or, one 1TTI resource is divided into multiple sTTI resources, first measure the S-RSSI of each sTTI resource, and then obtain the S-RSSI of the 1TTI resource according to the S-RSSI of each sTTI resource.

较佳地,对一个sTTI资源,如果所述sTTI资源所在的lTTI内,频率位置相同或者重叠的其他sTTI不可用,则UE增大选择所述sTTI资源的概率。Preferably, for one sTTI resource, if within the 1TTI where the sTTI resource is located, other sTTIs with the same or overlapping frequency positions are unavailable, the UE increases the probability of selecting the sTTI resource.

较佳地,当UE支持检测的SA数目小于一个lTTI内的多种TTI的SA的总数时,按照不同TTI长度的优先级来确定检测的SA资源Preferably, when the number of SAs supported by the UE for detection is less than the total number of SAs of multiple TTIs in one 1TTI, the detected SA resources are determined according to the priorities of different TTI lengths.

;或者,当UE支持检测的SA数目小于一个lTTI内的多种TTI的SA的总数时,分别确定UE需要检测的lTTI的SA资源个数和sTTI的SA资源个数。Or, when the number of SAs that the UE supports to detect is less than the total number of SAs of multiple TTIs in one 1TTI, determine the number of SA resources of 1TTI and the number of SA resources of sTTI that the UE needs to detect respectively.

较佳地,按照不同TTI长度的优先级来确定检测的不同TTI长度的PRB个数;或者,分别确定UE需要检测的lTTI的PRB个数和sTTI的PRB个数。Preferably, the number of detected PRBs of different TTI lengths is determined according to the priorities of different TTI lengths; or, the number of PRBs of 1TTI and the number of PRBs of sTTI to be detected by the UE are determined respectively.

一种利用多种传输时间间隔进行数据传输的设备,包括检测模块、资源选择模块和收发模块,其中:A device for data transmission using multiple transmission time intervals, comprising a detection module, a resource selection module and a transceiver module, wherein:

检测模块,用于UE在一个资源池内基于多种TTI长度在检测窗口内检测其他UE的SA,基于该SA测量调度的数据信道的接收功率,并检测各子帧的各子信道的接收能量;A detection module, used for UE to detect SAs of other UEs in a detection window based on multiple TTI lengths in a resource pool, measure the received power of the scheduled data channel based on the SA, and detect the received energy of each subchannel of each subframe;

资源选择模块,用于UE基于上述检测到的所述SA、接收功率以及接收能量,选择用于数据传输的资源;a resource selection module, used for the UE to select resources for data transmission based on the SA, received power and received energy detected above;

收发模块,UE传输SA指示所述选择的资源,并通过该资源进行数据传输。A transceiver module, the UE transmits the selected resource indicated by the SA, and performs data transmission through the resource.

采用本发明的方法,尽量避免采用不同长度TTI的UE之间的碰撞,提高资源利用率,保证不同长度TTI的传输性能。By adopting the method of the present invention, collision between UEs using TTIs of different lengths is avoided as much as possible, resource utilization is improved, and transmission performance of TTIs of different lengths is guaranteed.

附图说明Description of drawings

图1为基于检测的资源选择的示意图;1 is a schematic diagram of detection-based resource selection;

图2为基于检测的资源选择的流程图;Fig. 2 is the flow chart of resource selection based on detection;

图3为本发明流程图;Fig. 3 is the flow chart of the present invention;

图4为sTTI结构示意图;Figure 4 is a schematic diagram of the sTTI structure;

图5为sTTI的SA和数据信道资源示意图一;FIG. 5 is a schematic diagram 1 of SA and data channel resources of sTTI;

图6为sTTI的SA和数据信道资源示意图二;FIG. 6 is a schematic diagram 2 of SA and data channel resources of sTTI;

图7为本发明资源选择示意图;7 is a schematic diagram of resource selection according to the present invention;

图8为本发明设备图;Fig. 8 is the equipment diagram of the present invention;

图9为利用半个OFDM符号作为AGC的示意图;9 is a schematic diagram of using half an OFDM symbol as an AGC;

图10为利用半个OFDM符号作为GAP的示意图;10 is a schematic diagram of using half an OFDM symbol as a GAP;

图11为利用半个OFDM符号作为AGC和GAP的数据信道映射示意图。FIG. 11 is a schematic diagram of data channel mapping using half an OFDM symbol as AGC and GAP.

具体实施方式Detailed ways

为使本发明的目的、技术方案及优点更加清楚明白,以下参照附图并举实施例,对本发明作进一步详细说明。In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

在V2X通信中,参与通信的设备(UE)可以划分为多种类型,例如,车(VUE)、行人(PUE)和路边单元(RSU)等。假设UE的数据传输机制是,首先,UE发送控制信道,用于指示数据信道占用的时频资源和编码调制方式(MCS)等信息,以下称为调度分配信令(SA);接下来,上述UE在调度的数据信道上传输数据。对LTE D2D/V2X系统,上述SA又称为PSCCH,数据信道又称为PSSCH。对一个设备,因为它的数据在一段时间内基本是周期产生的,所以这个设备可以按照一定的预留间隔的周期性的预留资源;并且,每一个数据可以是重复发送K次,相应地需要预留K个资源,K大于或等于1,从而避免因为半双工操作的限制导致一部分设备无法接收这个数据。In V2X communication, the equipment (UE) participating in the communication can be divided into various types, such as vehicle (VUE), pedestrian (PUE), and roadside unit (RSU). Assuming that the data transmission mechanism of the UE is, first, the UE sends a control channel, which is used to indicate the time-frequency resources occupied by the data channel and information such as coding and modulation scheme (MCS), hereinafter referred to as scheduling assignment signaling (SA); The UE transmits data on the scheduled data channel. For the LTE D2D/V2X system, the above SA is also called PSCCH, and the data channel is also called PSSCH. For a device, because its data is basically generated periodically within a period of time, the device can periodically reserve resources according to a certain reservation interval; and each data can be repeatedly sent K times, correspondingly K resources need to be reserved, and K is greater than or equal to 1, so as to avoid that some devices cannot receive this data due to the limitation of half-duplex operation.

假设采用了多种传输时间间隔(TTI)长度,记最长的TTI为lTTI,其他TTI长度统称为sTTI,sTTI长度可以有一个或者多个。一个lTTI内划分的多个sTTI。采用sTTI有利于降低数据传输的时延,尤其适用于一些时延要求更严格的业务。在一个资源池内,可以是仅使用一种TTI长度,lTTI或者sTTI;或者也可以是允许同时存在lTTI和sTTI的数据传输。较佳地,一个UE的A和数据信道使用相同长度的TTI。Assuming that multiple transmission time interval (TTI) lengths are used, the longest TTI is recorded as 1TTI, and other TTI lengths are collectively referred to as sTTI, and there may be one or more sTTI lengths. Multiple sTTIs divided within one lTTI. Using sTTI is beneficial to reduce the delay of data transmission, especially for some services with stricter delay requirements. Within a resource pool, only one TTI length, 1TTI or sTTI, may be used; or it may also allow data transmission in which both 1TTI and sTTI exist at the same time. Preferably, the A and data channels of a UE use the same length of TTI.

图3为本发明支持多种TTI长度的方法的流程图,包括以下步骤:Fig. 3 is the flow chart of the method for supporting multiple TTI lengths of the present invention, comprises the following steps:

步骤301、UE在一个资源池上基于多种TTI长度在检测窗口内检测其他UE的SA,基于该SA测量调度的数据信道的接收功率,并检测各子帧的各子信道的接收能量。Step 301: The UE detects the SAs of other UEs in a detection window based on multiple TTI lengths on a resource pool, measures the received power of the scheduled data channel based on the SA, and detects the received energy of each subchannel in each subframe.

在上述对接收功率和接收能量的测量中,需要考虑多种TTI长度共存的影响。In the above measurement of received power and received energy, the influence of the coexistence of multiple TTI lengths needs to be considered.

步骤302、UE基于上述检测到的所述SA、接收功率以及接收能量,选择用于数据传输的资源。Step 302: The UE selects resources for data transmission based on the detected SA, received power, and received energy.

在上述资源选择过程中,可以尽量避免不同TTI长度的UE之间的影响,从而改进共存的性能。In the above resource selection process, the influence between UEs with different TTI lengths can be avoided as much as possible, thereby improving the coexistence performance.

步骤303、UE传输SA指示所述选择的资源,并通过该资源进行数据传输。Step 303: The UE transmits the selected resource indicated by the SA, and performs data transmission through the resource.

对一个lTTI内划分的多个sTTI,每个sTTI都包括自动增益控制(AGC)符号、DMRS和数据符号和间隔(GAP)符号。其中AGC符号用于接收端调节工作点,AGC符号可以发送数据或者不发送数据。GAP符号是时间间隔用于UE的收发转换时间,以及避免V2X信号和蜂窝网信号重叠和避免V2X信号之间的重叠。For multiple sTTIs divided within one 1TTI, each sTTI includes automatic gain control (AGC) symbols, DMRS and data symbols and space (GAP) symbols. The AGC symbol is used for the receiver to adjust the working point, and the AGC symbol can transmit data or not. The GAP symbol is the time interval used for the UE's transceiving transition time, as well as avoiding overlap between V2X signals and cellular network signals and avoiding overlap between V2X signals.

进一步地,本发明提供以下几个具体实施例,以详细阐述本发明支持多种TTI长度的方法。Further, the present invention provides the following specific embodiments to elaborate the method for supporting various TTI lengths of the present invention.

实施例一Example 1

在实际的通信中,很难精确预知UE类型和业务的分布。例如,按照lTTI工作的业务量和按照sTTI工作的业务量难于预测。所以需要考虑在同一个资源池内同时支持lTTI和sTTI的数据传输。In actual communication, it is difficult to accurately predict the distribution of UE types and services. For example, the traffic volume working according to lTTI and the traffic volume working according to sTTI are difficult to predict. Therefore, it is necessary to consider supporting the data transmission of lTTI and sTTI at the same time in the same resource pool.

如图4(a)所示是lTTI的结构,lTTI的第一个OFDM符号用于AGC,所以第一个OFDM符号上的数据很可能不能用于解码;最后一个OFDM符号是打掉的,作为GAP可以用于产生UE的收发转换时间,以及,在一个载波上复用V2X和蜂窝网的通信时,避免V2X的信号与蜂窝网的信号重叠,以及避免不同UE的V2X信号的重叠。例如,LTE版本14的V2X子帧结构采用图4(a)的lTTI结构。Figure 4(a) shows the structure of the lTTI. The first OFDM symbol of the lTTI is used for AGC, so the data on the first OFDM symbol may not be used for decoding; the last OFDM symbol is deleted as GAP can be used to generate the UE's transceiving transition time, and, when multiplexing V2X and cellular network communications on one carrier, avoid V2X signals overlapping with cellular network signals, and avoiding overlapping V2X signals of different UEs. For example, the V2X subframe structure of LTE Release 14 adopts the 1TTI structure of FIG. 4( a ).

一个lTTI可以进一步划分为两个或者多个sTTI。支持sTTI的UE需要的AGC和GAP的长度可以和仅支持lTTI的UE相同。或者,因为支持了sTTI的UE的时延要求比较严格,相应地对AGC和GAP的处理能力一般会相应地提高,所以AGC和GAP的长度可以缩短。另外,假设蜂窝网传输采用lTTI,除最后一个sTTI以外,不存在和蜂窝网传输重叠的问题。One lTTI can be further divided into two or more sTTIs. The lengths of AGC and GAP required by UEs supporting sTTI may be the same as UEs supporting only lTTI. Or, because the time delay requirement of the UE supporting sTTI is relatively strict, the processing capability of the AGC and the GAP is generally improved accordingly, so the lengths of the AGC and the GAP can be shortened. In addition, assuming that the cellular network transmission adopts lTTI, there is no problem of overlapping with the cellular network transmission except for the last sTTI.

如图4(b)所示,可以是在每个sTTI的开始部分设置AGC,并在结束部分设置GAP。sTTI的AGC和GAP与lTTI长度相等。或者,第一个sTTI的AGC与lTTI长度相同,最后一个sTTI的GAP与lTTI相同,sTTI的其他AGC和/或GAP可以比lTTI长度短。例如,第一个sTTI的AGC和最后一个sTTI的GAP可以包括多个OFDM符号,而sTTI的其他AGC和/或GAP仅包括一个OFDM符号。上述GAP可以用作UE的收发转换时间,以及避免不同UE的V2X信号的重叠。因为引入上述GAP,UE在一个sTTI的收发操作不影响在相邻的下一个sTTI的收发操作。这种方法的问题在于AGC和GAP的开销比较大。As shown in Figure 4(b), AGC may be set at the beginning of each sTTI, and GAP may be set at the end. The AGC and GAP of sTTI are equal in length to lTTI. Alternatively, the AGC of the first sTTI is the same length as the 1TTI, the GAP of the last sTTI is the same as the 1TTI, and other AGCs and/or GAPs of the sTTI may be shorter than the 1TTI length. For example, the AGC of the first sTTI and the GAP of the last sTTI may include multiple OFDM symbols, while the other AGCs and/or GAPs of the sTTI include only one OFDM symbol. The above-mentioned GAP can be used as the UE's transceiving conversion time, and avoid overlapping of V2X signals of different UEs. Because of the introduction of the above-mentioned GAP, the transceiving operation of the UE in one sTTI does not affect the transceiving operation in the adjacent next sTTI. The problem with this method is that the overhead of AGC and GAP is relatively large.

如图4(c)所示,可以是在每个sTTI的开始部分设置AGC,但是仅在最后一个sTTI的结束部分设置GAP,这个GAP与lTTI的GAP长度相同。sTTI的AGC与lTTI长度相等。或者,第一个sTTI的AGC与lTTI长度相同,其他sTTI的AGC可以比lTTI长度短。例如,第一个sTTI的AGC可以包括多个OFDM符号,而其他sTTI的AGC仅包括一个OFDM符号。因为其他sTTI的结束位置没有GAP,对在相邻的下一个sTTI上的收发操作产生影响。假设UE在一个sTTI内发送信号,这个UE可以利用下一个sTTI的AGC符号的前一部分时间完成发送到接收的转换,但是这意味着UE仅能利用AGC符号的剩余部分完成AGC操作;或者,这个UE可以是不在下一个sTTI进行接收操作。假设UE在一个sTTI内接收信号,这个UE可以利用下一个sTTI的AGC符号的前一部分时间完成接收到发送的转换,但是这意味着UE仅能在AGC符号的剩余部分发送有效的用于AGC的信号或者数据;或者,这个UE可以是不在下一个sTTI进行发送操作。As shown in Figure 4(c), AGC may be set at the beginning of each sTTI, but GAP is only set at the end of the last sTTI, and this GAP has the same length as that of 1TTI. The AGC of sTTI is equal to the length of lTTI. Alternatively, the AGC of the first sTTI may be the same length as the lTTI, and the AGC of the other sTTIs may be shorter than the lTTI length. For example, the AGC of the first sTTI may include multiple OFDM symbols, while the AGC of other sTTIs may include only one OFDM symbol. Because there is no GAP at the end positions of other sTTIs, it affects the transceiving operations on the adjacent next sTTI. Assuming that the UE transmits in one sTTI, the UE can use the first part of the AGC symbol of the next sTTI to complete the transition from transmit to receive, but this means that the UE can only use the remaining part of the AGC symbol to complete the AGC operation; alternatively, this The UE may not perform the receiving operation in the next sTTI. Assuming that the UE receives a signal in one sTTI, the UE can use the first part of the AGC symbol of the next sTTI to complete the transition from receive to transmit, but this means that the UE can only transmit valid for AGC in the remaining part of the AGC symbol. signal or data; or, the UE may not perform a transmission operation in the next sTTI.

如图4(d)所示,可以是第一个sTTI的开始部分设置AGC并与lTTI相同,最后一个sTTI的结束部分设置GAP并与lTTI相同,在相邻两个sTTI之间插入较短的GAP和AGC,即比lTTI的GAP和AGC短段。例如,用一个OFDM符号来生成GAP和AGC。因为引入上述GAP和AGC,UE在一个sTTI的收发操作不影响在相邻的下一个sTTI的收发操作。同时,因为上述GAP和AGC比较短,降低了AGC和GAP的开销。As shown in Figure 4(d), AGC can be set at the beginning of the first sTTI and is the same as lTTI, and GAP is set at the end of the last sTTI and is the same as lTTI, and a shorter sTTI is inserted between two adjacent sTTIs. GAP and AGC, that is, shorter segments than the GAP and AGC of 1TTI. For example, one OFDM symbol is used to generate GAP and AGC. Because of the introduction of the above-mentioned GAP and AGC, the transceiving operation of the UE in one sTTI does not affect the transceiving operation in the adjacent next sTTI. At the same time, because the above-mentioned GAP and AGC are relatively short, the overhead of AGC and GAP is reduced.

如图4(e)所示,进一步假设sTTI采用的子载波间隔(SCS)比lTTI大,从而sTTI的OFDM符号长度比lTTI短。第一个sTTI的开始部分设置AGC并与lTTI相同,例如,占用多个sTTI的OFDM符号;最后一个sTTI的结束部分设置GAP并与lTTI相同,例如,占用多个sTTI的OFDM符号;在相邻两个sTTI之间插入较短的GAP和AGC,即比lTTI的GAP和AGC短,例如,分别占用一个sTTI的OFDM符号。因为引入上述GAP和AGC,UE在一个sTTI的收发操作不影响在相邻的下一个sTTI的收发操作。同时,因为上述GAP和AGC比较短,降低了AGC和GAP的开销。As shown in FIG. 4(e), it is further assumed that the subcarrier spacing (SCS) adopted by sTTI is larger than that of 1TTI, so that the OFDM symbol length of sTTI is shorter than that of 1TTI. The beginning part of the first sTTI is set with AGC and is the same as lTTI, for example, OFDM symbols occupying multiple sTTIs; the end part of the last sTTI is set with GAP and the same as lTTI, for example, OFDM symbols occupying multiple sTTIs; A shorter GAP and AGC are inserted between two sTTIs, that is, shorter than the GAP and AGC of 1 TTI, for example, occupying an OFDM symbol of one sTTI respectively. Because of the introduction of the above-mentioned GAP and AGC, the transceiving operation of the UE in one sTTI does not affect the transceiving operation in the adjacent next sTTI. At the same time, because the above-mentioned GAP and AGC are relatively short, the overhead of AGC and GAP is reduced.

对图4(b)~4(e)的方法,在用于AGC的OFDM符号内,可以是占用所有的子载波传输数据,例如,以15kHz子载波间隔在AGC符号内传输数据;或者,也可以是每隔N个子载波在一个子载波上传输数据,例如N等于2。采用后一种方法,用于AGC的OFDM符号上的信号在时间上具有重复结构。如图9所示,假设N等于2,则AGC符号可以等分为2部分,可以仅基于后一部分接收到全部数据。接收端可以是利用AGC符号的前一部分完成AGC操作,并在AGC符号的后一部分上接收数据,从而降低了AGC的开销。依赖于接收端设备的实现,可以是利用AGC符号的后一部分接收数据,或者也可以是不利用AGC符号接收数据。For the methods of Figs. 4(b) to 4(e), in the OFDM symbol used for AGC, all subcarriers can be occupied to transmit data, for example, data is transmitted in the AGC symbol with 15kHz subcarrier interval; Data may be transmitted on one subcarrier every N subcarriers, for example, N is equal to 2. With the latter method, the signals on the OFDM symbols used for AGC have a repetitive structure in time. As shown in FIG. 9 , assuming that N is equal to 2, the AGC symbol can be equally divided into 2 parts, and all data can be received only based on the latter part. The receiving end may use the first part of the AGC symbol to complete the AGC operation, and receive data on the latter part of the AGC symbol, thereby reducing the overhead of the AGC. Depending on the implementation of the device at the receiving end, data may be received by using the latter part of the AGC symbol, or data may be received without using the AGC symbol.

如图4(f)所示,假设在AGC符号上是每隔N个子载波在一个子载波上传输数据,从而具有图9所示的重复结构,并且假设包含GAP的OFDM符号也是每隔N个子载波在一个子载波上传输数据,例如N等于2。如图10所示,假设N等于2,则OFDM符号可以等分为2部分,可以仅基于前一部分接收到全部数据。这个OFDM符号的前一部分可以仍然传输数据,但是在后一部分上停止传输从而生成GAP,从而降低了GAP的开销。lTTI的最后一个符号可以是采用图10所示的方法生成GAP,或者也可以是不发送任何信号,从而整个符号用于GAP。依赖于接收端设备的实现,可以是利用AGC符号的后一部分接收数据,或者也可以是不利用AGC符号接收数据。依赖于接收端设备的实现,可以是利用包含GAP的OFDM符号的前一部分接收数据,或者也可以是不利用包含GAP的OFDM符号接收数据。As shown in Figure 4(f), it is assumed that data is transmitted on one subcarrier every N subcarriers on the AGC symbol, thus having the repeating structure shown in Figure 9, and it is assumed that the OFDM symbol containing GAP is also every N subcarriers The carrier transmits data on one sub-carrier, eg N equals 2. As shown in FIG. 10 , assuming that N is equal to 2, the OFDM symbol can be equally divided into 2 parts, and all data can be received only based on the former part. The first part of this OFDM symbol can still transmit data, but stop transmission on the latter part to generate GAP, thereby reducing the overhead of GAP. The last symbol of the lTTI may use the method shown in FIG. 10 to generate the GAP, or it may not transmit any signal, so that the entire symbol is used for the GAP. Depending on the implementation of the device at the receiving end, data may be received by using the latter part of the AGC symbol, or data may be received without using the AGC symbol. Depending on the implementation of the device at the receiving end, data may be received by using the first part of the OFDM symbol containing GAP, or data may be received by not using the OFDM symbol containing GAP.

对图4(f)所示的sTTI结构,假设sTTI的第一个和最后一个OFDM符号都是每隔N个子载波在一个子载波上传输数据。如图11所示,假设N等于2,在第一个OFDM符号和最后一个OFDM符号传输的数据总量相当于在一个子载波间隔15kHz的OFDM符号上传输的数据量。在图11(a)中,假设sTTI的第一个和最后一个OFDM符号的用于数据传输的子载波相同。在图11(b)中,假设sTTI的第一个和最后一个OFDM符号的用于数据传输的子载波不同。对图11所示的映射结构,可以按照数据信道包含整数个OFDM符号的时频资源来处理速率匹配。例如,在图11中,假设其中两个OFDM符号用于承载DMRS,则可用于实际传输数据的OFDM符号数目等效为4个。即,可以按照4个OFDM符号来对数据传输执行速率匹配,但是实际上数据的调制符号是映射到了5个用于数据传输的OFDM符号上。For the sTTI structure shown in Fig. 4(f), it is assumed that the first and last OFDM symbols of the sTTI transmit data on one subcarrier every N subcarriers. As shown in FIG. 11 , assuming that N is equal to 2, the total amount of data transmitted in the first OFDM symbol and the last OFDM symbol is equivalent to the amount of data transmitted in an OFDM symbol with a subcarrier spacing of 15 kHz. In FIG. 11( a ), it is assumed that the subcarriers used for data transmission of the first and last OFDM symbols of the sTTI are the same. In Fig. 11(b), it is assumed that the subcarriers used for data transmission of the first and last OFDM symbols of the sTTI are different. For the mapping structure shown in FIG. 11 , the rate matching can be processed according to the time-frequency resources in which the data channel includes an integer number of OFDM symbols. For example, in FIG. 11 , assuming that two OFDM symbols are used to carry DMRS, the number of OFDM symbols that can be used to actually transmit data is equivalent to four. That is, rate matching may be performed for data transmission by 4 OFDM symbols, but actually the modulation symbols of data are mapped onto 5 OFDM symbols for data transmission.

实施例二Embodiment 2

当在一个资源池内同时支持lTTI和sTTI的数据传输时,资源池可以是仍然按照lTTI来配置或者预配置的。在LTE版本14中,去除一些不可用于V2X的子帧后,例如,同步信道(SLSS)的子帧、TDD下行子帧和预留的资源,对所有剩余子帧重新排序,然后在重新排序的逻辑子帧索引基础上周期应用一个比特映射来定义资源池。上述比特映射中的‘1’代表子帧属于这个资源池,‘0’代表不属于这个资源池。When the data transmission of lTTI and sTTI is supported simultaneously in one resource pool, the resource pool may still be configured or pre-configured according to the lTTI. In LTE Release 14, after removing some subframes that are not available for V2X, such as synchronization channel (SLSS) subframes, TDD downlink subframes, and reserved resources, all remaining subframes are reordered, and then reordered A bitmap is periodically applied based on the logical subframe index to define the resource pool. '1' in the above bitmap represents that the subframe belongs to this resource pool, and '0' represents that it does not belong to this resource pool.

对lTTI传输,可以是在物理子帧索引的基础上配置资源池,或者,也可以是按照LTE版本14的方法在逻辑子帧索引基础上定义资源池。对sTTI传输,其资源池仍然按照lTTI定义,从而不需要额外的信令或者配置信息。记一个lTTI划分为M个sTTI,则索引为k的lTTI内的第m个sTTI的索引为k·M+m,k=0,1,...,K-1,m=0,1,...,M-1,K是lTTI索引的最大值。采用这个方法,对一个业务,记采用lTTI传输时的预留间隔为Prsvp=k·Pstep,Pstep是基本预留间隔,例如100,k是一个系数,k的取值范围可以是高层配置的,在LTE版本14中,k的取值范围是的最大集合为[1/5,1/2,1,2,3,4,5,6,7,8,9,10],采用sTTI的预留间隔为

Figure BDA0001282637760000091
或者,sTTI用二维索引(k,m)来表示,其中k是sTTI所在lTTI的索引,m是sTTI在lTTI内的索引。采用这个方法,sTTI和lTTI的预留间隔相等,即Prsvp=k·Pstep,但是在处理资源选择和在SA中指示资源时,需要考虑二维索引(k,m)的影响。For 1TTI transmission, the resource pool may be configured on the basis of the physical subframe index, or, the resource pool may be defined on the basis of the logical subframe index according to the method of LTE Release 14. For sTTI transmission, its resource pool is still defined according to lTTI, so no additional signaling or configuration information is required. Denote that one lTTI is divided into M sTTIs, then the index of the mth sTTI in the lTTI with index k is k·M+m, k=0,1,...,K-1, m=0,1, ..., M-1, K is the maximum value of the lTTI index. Using this method, for a service, record the reserved interval when using lTTI transmission as P rsvp =k·P step , where P step is the basic reserved interval, for example, 100, k is a coefficient, and the value range of k can be the upper layer Configured, in LTE release 14, the maximum set of the value range of k is [1/5, 1/2, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10], using The reserved interval of sTTI is
Figure BDA0001282637760000091
Alternatively, the sTTI is represented by a two-dimensional index (k, m), where k is the index of the lTTI where the sTTI is located, and m is the index of the sTTI within the lTTI. With this method, the reservation interval of sTTI and 1TTI is equal, ie P rsvp =k·P step , but the influence of two-dimensional index (k,m) needs to be considered when processing resource selection and indicating resources in SA.

或者,对一个资源池,可以是去除一些不可用于V2X的时间单元(TU)后,上述TU可以是子帧,时隙或者迷你时隙(mini-slot),一个时隙划分为多个迷你时隙,采用lTTI的UE对所有剩余TU的lTTI重新排序,然后在重新排序的逻辑子帧索引基础上定义第一资源池;采用sTTI的UE对所有剩余TU的sTTI重新排序,然后在重新排序的逻辑子帧索引基础上定义第二资源池。从时间资源上看,第一个资源池和第二资源池可能是完全重叠的,或者也可以不完全重叠。Or, for a resource pool, after removing some time units (TUs) that cannot be used for V2X, the above TUs can be subframes, time slots or mini-slots (mini-slots), and a time slot is divided into multiple mini-slots. Time slot, the UE using 1TTI reorders the 1TTIs of all remaining TUs, and then defines the first resource pool based on the reordered logical subframe index; the UE using sTTI reorders the sTTIs of all remaining TUs, and then reorders the sTTIs of all remaining TUs. The second resource pool is defined based on the logical subframe index. In terms of time resources, the first resource pool and the second resource pool may completely overlap, or may not completely overlap.

实施例三Embodiment 3

在传输数据量一定的情况下,随着TTI的缩短,UE需要占用的频率资源数量相应地增加,从而保证一定的传输性能。例如,当SA是映射到lTTI传输时占用2个PRB,假设一个lTTI划分为2个sTTI,则在一个sTTI内传输SA时,需要占用约4个PRB。另外,以图4(b)为例,lTTI内的8个OFDM符号承载数据;因为额外的AGC和GAP的开销,sTTI内的承载DMRS和数据的OFDM符号仅为5个,假设两个OFDM符号作为DMRS,则仅有3个OFDM符号承载数据。这样,在保证SA的编码速率不变的情况下,需要的PRB个数为16/3。通过减少sTTI的SA的比特数,可以降低需要的PRB个数。In the case of a certain amount of transmitted data, with the shortening of the TTI, the number of frequency resources that the UE needs to occupy increases accordingly, thereby ensuring a certain transmission performance. For example, when SA is mapped to 1TTI for transmission, 2 PRBs are occupied. Suppose that one 1TTI is divided into 2 sTTIs, and about 4 PRBs need to be occupied when SA is transmitted in one sTTI. In addition, taking Figure 4(b) as an example, 8 OFDM symbols in 1TTI carry data; because of the additional overhead of AGC and GAP, there are only 5 OFDM symbols in sTTI that carry DMRS and data, assuming two OFDM symbols As a DMRS, only 3 OFDM symbols carry data. In this way, under the condition that the coding rate of SA remains unchanged, the required number of PRBs is 16/3. By reducing the number of bits of the SA of the sTTI, the required number of PRBs can be reduced.

对一个资源池,按照lTTI,其数据信道是划分为N个子信道,并以子信道来分配资源。相应地,SA资源池也是划分为N个SA资源,从而与N个数据子信道一一对应。因为TTI长度的变化,sTTI的划分的数据子信道个数可以与lTTI的划分的数据子信道个数相同或者更多。For a resource pool, according to 1TTI, its data channel is divided into N sub-channels, and resources are allocated by sub-channels. Correspondingly, the SA resource pool is also divided into N SA resources, which correspond to the N data subchannels one-to-one. Due to the change of the length of the TTI, the number of divided data subchannels of the sTTI may be the same as or more than the number of divided data subchannels of the lTTI.

假设sTTI数据子信道的PRB个数与lTTI相同,并假设一个sTTI的SA占用频率资源是lTTI的m倍。如图5所示,第q个sTTI的SA可以是占用lTTI的SA资源q+[0,1,...m-1],q=0,1,...M-1,M=N-m+1。第q个sTTI的SA可以是从数据子信道q开始,以连续n个子信道为粒度分配数据子信道。例如,n可以是1或者m,n可以是高层信令配置的或者预配置的。采用n大于1有利于降低在SA中指示子信道资源的开销。It is assumed that the number of PRBs of the sTTI data subchannel is the same as that of the 1TTI, and it is assumed that the frequency resources occupied by the SA of one sTTI are m times that of the 1TTI. As shown in FIG. 5 , the SA of the qth sTTI may be the SA resource q+[0,1,...m-1] occupying 1TTI, q=0,1,...M-1, M=N- m+1. The SA of the qth sTTI may start from the data subchannel q, and allocate data subchannels with a granularity of n consecutive subchannels. For example, n may be 1 or m, and n may be configured or pre-configured by higher layer signaling. Using n greater than 1 is beneficial to reduce the overhead of indicating sub-channel resources in the SA.

或者,假设一个sTTI的SA占用的频率资源是lTTI的m倍,,并且,一个sTTI数据子信道的PRB个数也是lTTI的m倍。如图6所示,第q个sTTI的SA可以是占用lTTI的SA资源q·m+[0,1,...m-1]+Δ1,q=0,1,...,M-1,

Figure BDA0001282637760000101
第q个sTTI数据子信道可以是占用lTTI数据子信道q·m+[0,1,...m-1]+Δ2。当m不能整除N时,上述Δ1和Δ2可以调整sTTI的SA在SA资源池中占用的SA资源的位置,以及sTTI数据子信道在数据资源池中占用的子信道的位置。Δ1和Δ2可以相等或者不相等。例如,Δ1和Δ2都等于0。从而,对sTTI来说,SA资源与数据子信道一一对应。第q个sTTI的SA可以是调度从sTTI数据子信道q开始的连续一个或者多个sTTI数据子信道。采用这个方法有利于降低在SA中指示子信道资源的开销。Alternatively, it is assumed that the frequency resource occupied by the SA of one sTTI is m times that of the 1TTI, and the number of PRBs of one sTTI data subchannel is also m times that of the 1TTI. As shown in FIG. 6 , the SA of the qth sTTI may be the SA resource q·m+[0,1,...m-1]+Δ 1 occupied by lTTI, q=0,1,...,M- 1,
Figure BDA0001282637760000101
The qth sTTI data subchannel may be occupied 1TTI data subchannel q·m+[0,1,...m-1]+ Δ2 . When m is not divisible by N, the above Δ1 and Δ2 can adjust the position of the SA resource occupied by the SA of the sTTI in the SA resource pool, and the position of the subchannel occupied by the sTTI data subchannel in the data resource pool. Δ1 and Δ2 may or may not be equal. For example, Δ1 and Δ2 are both equal to zero. Therefore, for sTTI, SA resources correspond to data subchannels one-to-one. The SA of the qth sTTI may be scheduling one or more consecutive sTTI data subchannels starting from the sTTI data subchannel q. Adopting this method is beneficial to reduce the overhead of indicating sub-channel resources in the SA.

实施例四Embodiment 4

在一个资源池内同时支持lTTI和sTTI的数据传输时,UE的资源选择需要考虑lTTI的数据传输和sTTI的数据传输的影响。When the data transmission of the 1TTI and the sTTI is supported simultaneously in a resource pool, the resource selection of the UE needs to consider the influence of the data transmission of the 1TTI and the data transmission of the sTTI.

UE检测其他UE的SA,并测量收到的SA调度的数据信道的PSSCH-RSRP,从而根据上述PSSCH-RSRP处理资源选择。UE需要检测lTTI的SA和sTTI的SA。当前检测到的PSSCH-RSRP超过门限时,相应的数据信道资源不可用。对不同的TTI长度,PSSCH-RSRP的门限可以是不同的。对不同的TTI长度,可以是分别配置或者预配置PSSCH-RSRP的门限。或者,对所述检测到的其他UE与所述执行检测的UE的TTI长度相同或者不同的情况,分别配置或者预配置PSSCH-RSRP的门限。或者,记PSSCH-RSRP门限为Th,当一个UE检测到调度相同长度TTI的SA时,把PSSCH_RSRP与门限Th比较判断资源是否可用;当一个UE检测到调度不同长度TTI的SA时,把PSSCH-RSRP与Th+Δ比较判断资源是否可用,Δ是功率调节参数,Δ是常数,或者,与所述检测到的其他UE和/或所述执行检测的UE的优先级有关。例如,对应调度不同长度TTI的SA的PSSCH-RSRP门限可以小于对应调度相同长度TTI的SA的PSSCH-RSRP门限,从而优先去除那些被采用了不同TTI长度的其他UE占用的资源,尽量避免采用不同TTI长度的UE之间的冲突。或者,记PSSCH-RSRP门限为Th,当一个UE检测到调度相同长度TTI的SA时,把PSSCH_RSRP与门限Th比较判断资源是否可用;当一个UE检测到调度不同长度TTI的SA时,可以对根据SA测量的PSSCH-RSRP进行修正,即把PSSCH_RSRP+Δ与门限Th比较判断资源是否可用,Δ是功率调节参数,Δ是常数,或者,与所述检测到的其他UE和/或所述执行检测的UE的优先级有关。例如,Δ可以是负值,从而优先去除那些被采用了相同TTI长度的其他UE占用的资源,从而允许更多的采用不同TTI长度的UE之间的冲突。在传输等量数据的情况,采用sTTI采用占用更多的频率资源,采用lTTI会占用更多的时间资源,采用两种传输方法的UE不会100%碰撞,从而采用不同TTI长度的UE占用的资源部分重叠在一定程度上对数据接收影响相对较小。上述根据PSSCH-RSRP去除资源的方法,可以仅用于当所述执行检测的UE采用lTTI时;或者,可以仅用于当所述执行检测的UE采用sTTI时;或者,也可以是不区分所述执行检测的UE的TTI长度,用于所述执行检测的UE。The UE detects the SAs of other UEs, and measures the PSSCH-RSRP of the received data channel scheduled by the SA, so as to process resource selection according to the above-mentioned PSSCH-RSRP. The UE needs to detect the SA of the lTTI and the SA of the sTTI. When the currently detected PSSCH-RSRP exceeds the threshold, the corresponding data channel resource is unavailable. For different TTI lengths, the thresholds of PSSCH-RSRP may be different. For different TTI lengths, the thresholds of PSSCH-RSRP may be separately configured or pre-configured. Alternatively, in the case that the TTI lengths of the detected other UE and the detected UE are the same or different, respectively configure or pre-configure the PSSCH-RSRP threshold. Or, denote the PSSCH-RSRP threshold as Th. When a UE detects an SA that schedules TTIs of the same length, it compares PSSCH_RSRP with the threshold Th to determine whether resources are available; when a UE detects an SA that schedules TTIs of different lengths, it sets PSSCH-RSRP to RSRP is compared with Th+Δ to determine whether the resource is available, Δ is a power adjustment parameter, Δ is a constant, or is related to the priority of the detected other UE and/or the detected UE. For example, the PSSCH-RSRP threshold corresponding to scheduling SAs with different TTI lengths may be smaller than the PSSCH-RSRP threshold corresponding to scheduling SAs with the same length TTI, so that the resources occupied by other UEs with different TTI lengths are preferentially removed, and the use of different TTI lengths is avoided as much as possible. Collision between UEs of TTI length. Alternatively, denote the PSSCH-RSRP threshold as Th. When a UE detects an SA that schedules TTIs of the same length, it compares PSSCH_RSRP with the threshold Th to determine whether resources are available; when a UE detects an SA that schedules TTIs of different lengths, it can The PSSCH-RSRP measured by SA is corrected, that is, PSSCH_RSRP+Δ is compared with the threshold Th to determine whether the resource is available, Δ is a power adjustment parameter, Δ is a constant, or, compared with the detected other UEs and/or the execution detection related to the priority of the UE. For example, Δ may be a negative value to preferentially remove resources occupied by other UEs using the same TTI length, thereby allowing more collisions between UEs using different TTI lengths. In the case of transmitting the same amount of data, using sTTI will occupy more frequency resources, using lTTI will occupy more time resources, and UEs using the two transmission methods will not 100% collide, so UEs using different TTI lengths will occupy more time resources. Partial overlap of resources has relatively little impact on data reception to a certain extent. The above method for removing resources according to PSSCH-RSRP can be used only when the UE performing detection adopts 1TTI; or, it can only be used when the UE performing detection adopts sTTI; The TTI length of the UE performing the detection is used for the UE performing the detection.

UE还可以测量资源的S-RSSI,并选择S-RSSI最小的若干个资源得到集合SB。上述资源的TTI长度与所述UE需要占用的TTI长度相同。为了得到一个lTTI资源的S-RSSI,假设按照lTTI测量S-RSSI,对一个lTTI,UE可以是测量除所述lTTI的AGC和GAP符号以外的其他符号得到S-RSSI。或者,对一个lTTI,考虑到lTTI分为多个sTTI,每个sTTI可能都有自己的GAP符号,UE可以是在除所述lTTI的AGC和GAP符号以外的所有不会用于GAP的符号上测量S-RSSI。例如,除lTTI的AGC和GAP符号以外,对图4(b)的方法,第一个sTTI的GAP符号不用于测量S-RSSI;对图4(d)的方法,第二个sTTI前部的GAP不用于测量S-RSSI;对图4(e),第一个sTTI的GAP符号不用于测量S-RSSI。UE还可以是只在按照上述规则确定的时间资源的一个子集上测量S-RSSI。采用这个方法,因为sTTI的GAP符号不用于测量S-RSSI,可以更加精确的估计干扰信号的强度,从而降低碰撞。为了得到一个sTTI资源的S-RSSI,假设按照sTTI测量S-RSSI,对一个sTTI,UE可以是测量除所述sTTI的AGC和GAP符号以外的其他符号得到S-RSSI。对一个lTTI的资源,假设它在时间上划分为N个sTTI资源sn,n=0,1...N-1,sn频率资源与上述lTTI资源相同,为了得到上述lTTI资源的S-RSSI,UE还可以是首先测量各个sTTI资源sn的S-RSSI,然后,根据各个sTTI资源sn的S-RSSI得到上述lTTI资源的S-RSSI。例如,上述lTTI资源的S-RSSI可以是各个sTTI资源sn的S-RSSI的最大值、平均值或者加权平均值等。上述测量S-RSSI的方法,可以仅用于当所述执行检测的UE采用lTTI时;或者,可以仅用于当所述执行检测的UE采用sTTI时;或者,也可以是不区分所述执行检测的UE的TTI长度,用于所述执行检测的UE。The UE may also measure the S-RSSI of the resources, and select several resources with the smallest S-RSSI to obtain the set SB . The TTI length of the above resource is the same as the TTI length that the UE needs to occupy. In order to obtain the S-RSSI of one 1TTI resource, it is assumed that the S-RSSI is measured according to the 1TTI. For one 1TTI, the UE may obtain the S-RSSI by measuring other symbols except the AGC and GAP symbols of the 1TTI. Or, for one lTTI, considering that the lTTI is divided into multiple sTTIs, each sTTI may have its own GAP symbol, and the UE may be on all symbols that will not be used for GAP except the AGC and GAP symbols of the lTTI Measure S-RSSI. For example, with the exception of the AGC and GAP symbols of 1TTI, for the method of Fig. 4(b), the GAP symbol of the first sTTI is not used to measure S-RSSI; for the method of Fig. 4(d), the first sTTI GAP is not used to measure S-RSSI; for Figure 4(e), the GAP symbol of the first sTTI is not used to measure S-RSSI. The UE may also measure the S-RSSI only on a subset of the time resources determined according to the above rules. With this method, since the GAP symbols of sTTI are not used to measure S-RSSI, the strength of the interfering signal can be estimated more accurately, thereby reducing collisions. In order to obtain the S-RSSI of an sTTI resource, it is assumed that the S-RSSI is measured according to the sTTI. For an sTTI, the UE may obtain the S-RSSI by measuring other symbols except the AGC and GAP symbols of the sTTI. For an 1TTI resource, it is assumed that it is divided into N sTTI resources s n in time, n=0, 1...N-1, and the s n frequency resource is the same as the above 1TTI resource, in order to obtain the above 1TTI resource S- For RSSI, the UE may first measure the S-RSSI of each sTTI resource sn, and then obtain the S-RSSI of the above-mentioned 1TTI resource according to the S-RSSI of each sTTI resource sn . For example, the S-RSSI of the above-mentioned 1TTI resource may be the maximum value, the average value, or the weighted average value of the S-RSSI of each sTTI resource sn. The above method for measuring S-RSSI may only be used when the UE performing detection adopts 1TTI; or, it may only be used when the UE performing detection adopts sTTI; The TTI length of the detected UE, used for the detected UE.

接下来UE在集合SB选择资源。UE可以是在集合SB随机选择资源。或者,对采用sTTI的UE,对SB中的一个sTTI资源,如果这个sTTI资源所在的lTTI内,频率位置相同或者重叠的其他sTTI不可用,则UE可以以较大概率选择这样的sTTI资源。采用这个方法,使sTTI的UE在一个lTTI尽量使用相同或者临近的PRB,从而有可能留出更多的lTTI资源用于lTTI的UE,进而避免不同TTI长度的UE之间的碰撞。如图7所示,假设资源702和711不可用,其他四个资源701、712、703、713都可用,因为资源703和713位于相同的PRB,使他们被sTTI的UE选择的概率低于资源701和712,从而方便资源703和713组成的lTTI资源被其他lTTI的UE选择。Next, the UE selects resources in set SB . The UE may randomly select resources in set SB . Or, for a UE using sTTI, for an sTTI resource in SB , if other sTTIs with the same frequency location or overlapping are not available within the 1TTI where this sTTI resource is located, the UE can select such an sTTI resource with a high probability. By adopting this method, the sTTI UEs try to use the same or adjacent PRBs in one 1TTI, so that more 1TTI resources may be reserved for the 1TTI UEs, thereby avoiding collisions between UEs with different TTI lengths. As shown in Figure 7, assuming that resources 702 and 711 are unavailable, the other four resources 701, 712, 703, 713 are all available, because resources 703 and 713 are located in the same PRB, making them less probabilities of being selected by UEs of sTTI than resources 701 and 712, thereby facilitating the selection of the 1TTI resource composed of resources 703 and 713 by UEs of other 1TTIs.

对一个资源池,在一个lTTI划分了N个lTTI的SA资源,在一个sTTI划分了M个sTTI的SA资源,在一个lTTI的时间段内,UE需要检测的SA的总数为L=N+m·M,m是一个lTTI划分的sTTI的个数。UE在一个lTTI时间段内可以检测的SA的个数依赖于UE的能力。对能力特别强的UE,即可以检测的SA的个数大于等于L,UE可以检测每一个可能的SA资源。假设UE的能力有限,即可以检测的SA的个数小于等于L,则可以是定义UE选择检测的SA的规则。一种可能的规则是,对不同的TTI长度定义不同的检测优先级。例如,UE首先保证检测所有的lTTI的SA资源,然后剩余能力用于检测sTTI的SA资源。例如,假设与安全相关的V2X消息是通过lTTI发送的,所以需要优先检测lTTI的SA资源。或者,另一种规则是分别确定UE需要检测的lTTI的SA资源个数LL和sTTI的SA资源个数LS。上述参数LL和LS可以是基站配置的,预配置的,或者对应一种UE能力在标准中预定义的。或者,记UE在一个lTTI内支持检测SA的最大个数为Lmax,另一种规则是确定UE需要检测的lTTI的SA资源个数LL,则剩余SA检测能力,即Lmax-LL用于处理sTTI的SA资源。上述参数LL可以是基站配置的,预配置的,或者对应一种UE能力在标准中预定义的。For a resource pool, the SA resources of N 1TTIs are divided into one 1TTI, and the SA resources of M sTTIs are divided into one sTTI. In the time period of one 1TTI, the total number of SAs that the UE needs to detect is L=N+m · M, m is the number of sTTIs divided into one lTTI. The number of SAs that the UE can detect in one 1TTI period depends on the capability of the UE. For a UE with a particularly strong capability, that is, the number of SAs that can be detected is greater than or equal to L, the UE can detect every possible SA resource. Assuming that the capability of the UE is limited, that is, the number of SAs that can be detected is less than or equal to L, it may be a rule that defines the SA that the UE selects and detects. A possible rule is to define different detection priorities for different TTI lengths. For example, the UE first guarantees to detect SA resources of all 1TTIs, and then the remaining capacity is used to detect SA resources of sTTIs. For example, it is assumed that the security-related V2X messages are sent through the 1TTI, so the SA resources of the 1TTI need to be detected preferentially. Alternatively, another rule is to separately determine the number of 1TTI SA resources L L and the number of sTTI SA resources L S that the UE needs to detect. The above-mentioned parameters L L and L S may be configured by the base station, pre-configured, or predefined in a standard corresponding to a UE capability. Or, record the maximum number of SAs that the UE supports to detect in one 1TTI as L max , another rule is to determine the number of SA resources L L of the 1 TTI that the UE needs to detect, then the remaining SA detection capability is L max -L L SA resources for handling sTTI. The above-mentioned parameter LL may be configured by the base station, pre-configured, or predefined in a standard corresponding to a UE capability.

另外,UE能够解码的PRB总数也是依赖于UE的能力。上述PRB总数可以专指数据信道的PRB总数,或者也可以是包含SA和数据信道的PRB总数。可以是仅按照一种TTI长度,例如lTTI定义UE可以检测的PRB个数的能力,并且上述能力可以转化为其他TTI长度的能力。或者,也可以是分别按照每种TTI长度定义UE可以检测的PRB个数的能力。按照一种TTI长度的定义UE可以检测的PRB个数的能力可以是仅能用于检测这种TTI长度的PRB;或者,按照一种TTI长度的定义UE可以检测的PRB个数的能力也可以转化为用于检测其他TTI长度的PRB。例如,记UE在一个lTTI内可以检测的PRB总数为N,对应地,可以是定义UE在一个sTTI内可以检测的PRB个数为c·N,其中c是系数,可以与sTTI和lTTI的相对长度有关,例如c等于2。假设UE的能力有限,可以是定义UE确定按照不同TTI长度检测的PRB个数的规则。一种可能的规则是,对不同的TTI长度定义不同的检测优先级。例如,UE首先保证检测所有的lTTI的PRB,然后剩余能力用于检测sTTI的PRB。例如,假设与安全相关的V2X消息是通过lTTI发送的,所以需要优先检测lTTI的PRB。或者,另一种规则是分别确定UE需要检测的lTTI的PRB源个数LL和sTTI的PRB个数LS。上述参数LL和LS可以是基站配置的,预配置的,或者对应一种UE能力在标准中预定义的。或者,假设UE按照lTTI内支持检测的PRB最大个数为Lmax,另一种规则是确定UE需要检测的lTTI的PRB个数LL,则剩余检测能力用于处理sTTI的PRB,即对应Lmax-LL个lTTI的PRB的检测能力用于处理sTTI的PRB。上述参数LL可以是基站配置的,预配置的,或者对应一种UE能力在标准中预定义的。In addition, the total number of PRBs that the UE can decode also depends on the capabilities of the UE. The above-mentioned total number of PRBs may specifically refer to the total number of PRBs of the data channel, or may also be the total number of PRBs including the SA and the data channel. It can be the ability to define the number of PRBs that the UE can detect only according to one TTI length, for example, 1TTI, and the above-mentioned ability can be converted into the ability of other TTI lengths. Alternatively, it may also be the ability to define the number of PRBs that the UE can detect according to each TTI length. The ability to define the number of PRBs that the UE can detect according to a TTI length may only be used to detect PRBs of this TTI length; or, the ability to define the number of PRBs that the UE can detect according to a TTI length may also be Converted to PRBs for detection of other TTI lengths. For example, denote the total number of PRBs that the UE can detect in one 1TTI as N. Correspondingly, the number of PRBs that the UE can detect in one sTTI can be defined as c·N, where c is a coefficient, which can be compared with the relative relationship between sTTI and 1TTI. Length is related, e.g. c is equal to 2. Assuming that the capability of the UE is limited, it may be a rule that defines the number of PRBs detected by the UE according to different TTI lengths. A possible rule is to define different detection priorities for different TTI lengths. For example, the UE first guarantees to detect PRBs of all 1TTIs, and then the remaining capacity is used to detect PRBs of sTTIs. For example, it is assumed that security-related V2X messages are sent through 1TTI, so the PRB of 1TTI needs to be detected preferentially. Alternatively, another rule is to respectively determine the number of 1TTI PRB sources L L and the number of sTTI PRBs L S that the UE needs to detect. The above-mentioned parameters L L and L S may be configured by the base station, pre-configured, or predefined in a standard corresponding to a UE capability. Alternatively, assuming that the maximum number of PRBs that the UE supports to detect in 1TTI is L max , another rule is to determine the number of 1TTI PRBs that the UE needs to detect, L L , then the remaining detection capability is used to process the sTTI PRBs, that is, corresponding to L The detection capability of max -L L lTTI PRBs is used to process sTTI PRBs. The above-mentioned parameter LL may be configured by the base station, pre-configured, or predefined in a standard corresponding to a UE capability.

对应于上述方法,本申请还公开了一种设备,该设备可以用于实现上述方法,如图8所示,该设备包括检测模块、资源选择模块和收发模块,其中:Corresponding to the above method, the present application also discloses a device that can be used to implement the above method. As shown in FIG. 8 , the device includes a detection module, a resource selection module and a transceiver module, wherein:

检测模块,用于UE在一个资源池内基于多种TTI长度在检测窗口内检测其他UE的SA,基于该SA测量调度的数据信道的接收功率,并检测各子帧的各子信道的接收能量;A detection module, used for UE to detect SAs of other UEs in a detection window based on multiple TTI lengths in a resource pool, measure the received power of the scheduled data channel based on the SA, and detect the received energy of each subchannel of each subframe;

资源选择模块,用于UE基于上述检测到的所述SA、接收功率以及接收能量,选择用于数据传输的资源;a resource selection module, used for the UE to select resources for data transmission based on the SA, received power and received energy detected above;

收发模块,用于UE传输SA指示所述选择的资源,并通过该资源进行数据传输。The transceiver module is used for the UE to transmit the selected resource indicated by the SA, and to perform data transmission through the resource.

本技术领域的普通技术人员可以理解实现上述实施例方法携带的全部或部分步骤是可以通过程序来指令相关的硬件完成,所述的程序可以存储于一种计算机可读存储介质中,该程序在执行时,包括方法实施例的步骤之一或其组合。Those skilled in the art can understand that all or part of the steps carried by the methods of the above embodiments can be completed by instructing the relevant hardware through a program, and the program can be stored in a computer-readable storage medium, and the program can be stored in a computer-readable storage medium. When executed, one or a combination of the steps of the method embodiment is included.

此外,在本申请各个实施例中的各功能单元可以集成在一个处理模块中,也可以是各个单元单独物理存在,也可以两个或两个以上单元集成在一个模块中。上述集成的模块既可以采用硬件的形式实现,也可以采用软件功能模块的形式实现。所述集成的模块如果以软件功能模块的形式实现并作为独立的产品销售或使用时,也可以存储在一个计算机可读取存储介质中。In addition, each functional unit in each embodiment of the present application may be integrated into one processing module, or each unit may exist physically alone, or two or more units may be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules. If the integrated modules are implemented in the form of software functional modules and sold or used as independent products, they may also be stored in a computer-readable storage medium.

上述提到的存储介质可以是只读存储器,磁盘或光盘等。The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, and the like.

以上所述仅为本申请的较佳实施例而已,并不用以限制本申请,凡在本申请的精神和原则之内,所做的任何修改、等同替换、改进等,均应包含在本申请保护的范围之内。The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the present application. within the scope of protection.

Claims (29)

1. A method performed by a user equipment, UE, in a communication system, comprising:
receiving control information on a PSCCH, wherein the control information comprises information of resources scheduled by the PSCCH for the PSSCH;
determining Reference Signal Received Power (RSRP) of PSSCH;
determining a set of resources for data transmission based on the RSRP and a threshold;
transmitting data through the resource set;
wherein the threshold is determined based on a length of a TTI of the PSSCH.
2. The method of claim 1, further comprising:
one long tti (ltti) divides a plurality of short ttis (stti);
setting Automatic Gain Control (AGC) at the beginning part of each sTTI; and
setting a GAP at the ending part;
the length of AGC of each sTTI is equal to that of AGC of the lTTI, and the length of GAP of each sTTI is equal to that of GAP of the lTTI; or,
the length of AGC of the first sTTI is the same as that of AGC of the l TTI, the length of GAP of the last sTTI is the same as that of GAP of the l TTI, and the lengths of AGC or GAP of other sTTI are shorter than that of AGC or GAP of the l TTI; or
The length of AGC and GAP for each other sTTI is shorter than the length of AGC and GAP for the tti, respectively.
3. The method of claim 1, wherein the data is transmitted on a subset of the set of resources, wherein the subset is identified based on a length of a TTI used for data transmission.
4. The method of claim 1, wherein one tti divides a plurality of ttis, the first sTTI is configured with AGC and same as the tti, the last sTTI is configured with GAP and same as the tti, and a shorter GAP and AGC are inserted between two adjacent sTTI.
5. The method of claim 1, wherein an tti divides a plurality of sTTI, wherein the first and last OFDM symbols of the sTTI are each transmitted on one subcarrier every N subcarriers, and wherein N is a constant.
6. The method of claim 1, wherein when data transmission is performed based on TTIs of various lengths, the resource pool is configured according to lTTI; alternatively, the resource pool is configured for each TTI of length.
7. The method according to claim 1, wherein the scheduling assignment signaling SA of the sTTI is assumed to occupy M times of frequency resources of the tti, and the SA of the qth sTTI occupies SA resources q + [0, 1.. M-1], q ═ 0, 1.. M-1, M ═ N-M +1, and N is the number of tti data subchannels.
8. The method of claim 1, wherein the SA of the qth sTTI occupies m times of frequency resources of the tti and the SA of the qth sTTI occupies q · m + [0, 1.. m-1] of SA resources of the tti]+Δ 1 ,q=0,1,...,M-1,
Figure FDA0003594277280000021
The qth sTTI data subchannel occupies the lTTI data subchannel q · m + [0, 1.. m-1]]+Δ 2 ,Δ 1 And Δ 2 Is a parameter of resource location, and N is the number of ttis data subchannels.
9. The method of claim 1, wherein the PSSCH-RSRP thresholds are different for different TTI lengths when SAs of different TTI lengths are received; or, recording the PSSCH-RSRP threshold as Th, comparing the PSSCH-RSRP with Th + delta to judge whether the resource is available, wherein delta is a power regulation parameter; or comparing PSSCH-RSRP + delta with a threshold to judge whether the resource is available, wherein PSSCH-RSRP is the received power of the data channel, and delta is the power adjusting parameter.
10. The method of claim 9, wherein RSRP of the PSSCH is less than or equal to the threshold, and wherein the set of resources for data transmission includes resources for the PSSCH; the RSRP of the PSSCH is greater than the threshold, and the set of resources for data transmission does not include resources for the PSSCH.
11. The method of claim 1, the determining a set of resources for data transmission comprising:
for one sTTI resource, if other sTTI with the same frequency position or overlapping frequency position is unavailable in the lTTI where the sTTI resource is located, the UE increases the probability of selecting the sTTI resource.
12. The method of claim 1, the determining resources for data transmission comprising:
when the number of the SAs supported by the UE to be detected is less than the total number of the SAs of various TTIs with different lengths in the lTTI, determining the detected SA resources according to the priority of the TTIs with different lengths; or,
and when the number of the SAs supported and detected by the UE is less than the total number of the SAs of the plurality of TTIs with different lengths in the lTTI, respectively determining the number of the SA resources of the lTTI and the number of the SA resources of the sTTI which need to be detected by the UE.
13. The method of claim 1, the determining a set of resources for data transmission comprising:
determining the number of detected resource blocks PRB of the TTIs with different lengths according to the priorities of the TTIs with different lengths; or respectively determining the PRB number of lTTI and the PRB number of sTTI which are required to be detected by the UE.
14. The method of claim 1, the control information is received based on a length of a plurality of TTIs.
15. An apparatus performed by a User Equipment (UE) in a communication system, comprising a detection module, a resource selection module, and a transceiving module, wherein:
a detection module, configured to receive control information on a PSCCH, where the control information includes information of resources for the PSCCH scheduled by the PSCCH; determining Reference Signal Received Power (RSRP) of PSSCH;
a resource selection module to determine a set of resources for data transmission based on the RSRP and a threshold;
the transceiving module is used for carrying out data transmission through the resource set;
wherein the threshold is determined based on a length of a TTI of the PSSCH.
16. The apparatus of claim 15, wherein:
one long tti (ltti) divides a plurality of short ttis (stti);
setting automatic gain control AGC at the beginning part of each sTTI; and
setting a GAP at the ending part;
the length of AGC of each sTTI is equal to that of AGC of the l TTI, and the length of GAP of each sTTI is equal to that of GAP of the l TTI; or,
the length of AGC of the first sTTI is the same as that of AGC of the l TTI, the length of GAP of the last sTTI is the same as that of GAP of the l TTI, and the lengths of AGC or GAP of other sTTI are shorter than that of AGC or GAP of the l TTI; or
The length of AGC and GAP for each other sTTI is shorter than the length of AGC and GAP for the tti, respectively.
17. The apparatus of claim 15, wherein the data is transmitted on a subset of the set of resources, wherein the subset is identified based on a length of a TTI used for data transmission.
18. The apparatus of claim 15, wherein an tti divides a plurality of sTTI, a first sTTI is configured with AGC and same as the tti, a last sTTI is configured with GAP and same as the tti, and a shorter GAP and AGC are inserted between two adjacent sTTI.
19. The apparatus of claim 15, wherein an tti divides a plurality of sTTI, wherein the first and last OFDM symbols of the sTTI are each to transmit data on one subcarrier every N subcarriers, and wherein N is a constant.
20. The apparatus of claim 15, wherein when data transmission is performed based on TTIs of various lengths, the resource pool is configured according to lTTI; alternatively, the resource pool is configured for each TTI of length.
21. The apparatus according to claim 15, wherein the SA of sTTI occupies M times of frequency resources of lti, the SA of qth sTTI occupies q + [0, 1.. M-1], q ═ 0, 1.. M-1, M ═ N-M +1, and N is the number of lti data subchannels.
22. The apparatus of claim 15, wherein the SA of the qth sTTI occupies m times of frequency resources of the tti and the SA of the qth sTTI occupies q · m + [0, 1.. m-1] of SA resources of the tti]+Δ 1 ,q=0,1,...,M-1,
Figure FDA0003594277280000031
The qth sTTI data sub-channel occupies the lttti data sub-channel q · m + [0, 1.. m-1]]+Δ 2 ,Δ 1 And Δ 2 Is a parameter of resource location, and N is the number of ttis data subchannels.
23. The apparatus of claim 15, wherein when SA of different length TTIs are received, the PSSCH-RSRP thresholds are different for different TTI lengths; or, recording the PSSCH-RSRP threshold as Th, comparing the PSSCH-RSRP with Th + delta to judge whether the resource is available, wherein delta is a power regulation parameter; or comparing PSSCH-RSRP + delta with a threshold to judge whether the resource is available, wherein PSSCH-RSRP is the received power of the data channel, and delta is the power adjusting parameter.
24. The device of claim 23, wherein RSRP of the PSSCH is less than or equal to the threshold, and wherein the set of resources for data transmission comprises resources for the PSSCH; the RSRP of the PSSCH is greater than the threshold, and the set of resources for data transmission does not include resources for the PSSCH.
25. The apparatus of claim 15, the determining a set of resources for data transmission comprising:
for one sTTI resource, if other sTTI with the same frequency position or overlapping frequency position is unavailable in the lTTI where the sTTI resource is located, the UE increases the probability of selecting the sTTI resource.
26. The device of claim 15, the resource selection module to determine resources for data transmission comprises:
when the number of the SAs supported by the UE to be detected is less than the total number of the SAs of various TTIs with different lengths in the lTTI, determining the detected SA resources according to the priority of the TTIs with different lengths; or,
and when the number of the SAs supported and detected by the UE is less than the total number of the SAs of the plurality of TTIs with different lengths in the lTTI, respectively determining the number of the SA resources of the lTTI and the number of the SA resources of the sTTI which need to be detected by the UE.
27. The device of claim 15, the resource selection module to determine the set of resources for data transmission comprises:
determining the number of PRBs of TTIs with different lengths according to the priorities of the TTIs with different lengths; or respectively determining the PRB number of lTTI and the PRB number of sTTI which are required to be detected by the UE.
28. The apparatus of claim 15, the control information is received based on a length of a plurality of TTIs.
29. A user device, comprising:
a transceiver; and
a processor coupled to the transceiver and configured to perform the method of any of claims 1-14.
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