CN103188795B - A kind of method and apparatus promoting TD-LTE and TD-SCDMA adjacent frequency coexistence capacity - Google Patents
A kind of method and apparatus promoting TD-LTE and TD-SCDMA adjacent frequency coexistence capacity Download PDFInfo
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Abstract
Description
技术领域 technical field
本发明涉及无线通信技术领域，尤其涉及一种提升TD-LTE与TD-SCDMA邻频共存容量的方法和装置。The invention relates to the technical field of wireless communication, in particular to a method and a device for improving the co-existence capacity of adjacent frequencies of TD-LTE and TD-SCDMA.
背景技术 Background technique
目前的通信编码技术中，TD-LTE的无线帧长为10ms，每个10ms的无线帧包含两个5ms的半帧。每个半帧中包含8个长度为0.5ms的时隙以及3个特殊时隙：DwPTS、GP以及UpPTS。DwPTS和UpPTS的长度可配置，且DwPTS，GP以及UpPTS的总长度为1ms。LTETDD同时支持5ms以及10ms的上下行切换点周期。子帧1中包含DwPTS，GP以及UpPTS。在5ms切换周期时，子帧6包含DwPTS，GP以及UpPTS，在10ms切换周期时子帧6只包含DwPTS。其他所有的子帧均包含两个等长的时隙。GP保留给下行到上行的切换。其他的子帧/时隙用于上行传输或下行传输。上行传输和下行传输在时域中分离，其结构如图1所示。In the current communication coding technology, the wireless frame length of TD-LTE is 10ms, and each 10ms wireless frame includes two 5ms half-frames. Each half frame contains 8 time slots with a length of 0.5 ms and 3 special time slots: DwPTS, GP and UpPTS. The length of DwPTS and UpPTS is configurable, and the total length of DwPTS, GP and UpPTS is 1ms. LTE TDD also supports uplink and downlink switching point periods of 5ms and 10ms. Subframe 1 includes DwPTS, GP and UpPTS. When the switching period is 5ms, subframe 6 includes DwPTS, GP and UpPTS, and when switching period is 10ms, subframe 6 only includes DwPTS. All other subframes consist of two slots of equal length. GP is reserved for downlink to uplink handover. Other subframes/slots are used for uplink transmission or downlink transmission. Uplink transmission and downlink transmission are separated in the time domain, and its structure is shown in Figure 1.
TD-LTE上下行分配配置如下表所示，TD-LTE uplink and downlink allocation configuration is shown in the following table,
特殊时隙中DwPTS的长度可配置为3～12个OFDM符号，其中，主同步信号位于第三个符号，相应的，在这个特殊子帧中PDCCH的最大长度为两个符号。UpPTS的长度可配置为1～2个OFDM符号，可用于承载随机接入信道和/或者Sounding参考信号。GP用于上下行转换保护，主要由“传输时延”和“设备收发转换时延”构成。特殊时隙的长度由高层信令配置，特殊时隙的配置选项如下表所示。The length of the DwPTS in a special time slot can be configured as 3 to 12 OFDM symbols, wherein the primary synchronization signal is located in the third symbol, and correspondingly, the maximum length of the PDCCH in this special subframe is two symbols. The length of the UpPTS can be configured as 1-2 OFDM symbols, and can be used to carry a random access channel and/or a Sounding reference signal. GP is used for uplink and downlink conversion protection, mainly composed of "transmission delay" and "device sending and receiving conversion delay". The length of the special time slot is configured by high-level signaling, and the configuration options of the special time slot are shown in the table below.
特殊子帧中的GP、DwPTS和UpPTS可以灵活调整宽度，DwPTS和UpPTS两个特殊时隙也可以传输数据，如果GP的宽度越大，意味着DwPTS和UpPTS可用于传输的数据越少，即损失了系统容量。当TD-SCDMA与TD-LTE两个系统在同一频段相临共存时，需要调整TD-LTE的GP大小来保证上下行切换点对齐，从而避免两系统上下行间的干扰。GP, DwPTS, and UpPTS in special subframes can flexibly adjust the width, and the two special time slots of DwPTS and UpPTS can also transmit data. If the width of GP is larger, it means that DwPTS and UpPTS can be used for less data transmission, that is, loss system capacity. When two systems, TD-SCDMA and TD-LTE, coexist in the same frequency band, it is necessary to adjust the GP size of TD-LTE to ensure that the uplink and downlink switching points are aligned, so as to avoid the interference between the uplink and downlink of the two systems.
方案(1)当TD-SCDMA时隙配比为3∶3时，TD-LTE采用2∶2子帧配比，特殊子帧设定为配置7，可以实现完美共存，基本上没有资源损失。Solution (1) When the TD-SCDMA time slot ratio is 3:3, TD-LTE adopts a 2:2 subframe ratio, and the special subframe is set to configuration 7, which can achieve perfect coexistence and basically no resource loss.
但当TD-SCDMA时隙配比为2∶4或5∶1时，TD-LTE采用3∶1和1∶3子帧配比，TD-LTE需将特殊子帧设定为配置0、5，相比方案(1)，TD-LTE多损失了18％的系统容量，不利于系统容量和频谱利用率的提升。However, when the TD-SCDMA time slot ratio is 2:4 or 5:1, TD-LTE adopts the subframe ratio of 3:1 and 1:3, and TD-LTE needs to set the special subframe as configuration 0, 5 , compared with solution (1), TD-LTE loses 18% more system capacity, which is not conducive to the improvement of system capacity and spectrum utilization.
TD-SCDMA的设计中，DwPTS(每个子帧中的下行导频时隙)承载的是下行同步信道(DwPCH)，下行导频信道的目的是作为下行导频和下行同步信号。DwPCH发射的信号要覆盖整个目标小区，使用固定功率发射信号。其发射功率值由高层信令下发，并在小区内广播。该时隙是由长为64chips的SYNC_DL序列和32chips的保护间隔组成。UpPTS(上行导频时隙)承载的是上行同步信道(UpPCH)，上行导频信道的目的是为了实现上行同步。当终端需要与网络侧建立连接时，它将首先发射UpPCH，当得到网络的应答(FPACH)后，终端在上行发送RACH信道。上行导频时隙由长为128chips的SYNC_UL序列和32chips的保护间隔组成。DwPTS，GP以及UpPTS是TD-SCDMA系统的特殊时隙、承载特殊信道，长度固定，不能改变。而TD-LTE中，GP、UpPTS需至少占用一个符号，而DwPTS由于其功能与其他下行时隙没有区别，DwPTS长度可变。In the design of TD-SCDMA, the DwPTS (downlink pilot time slot in each subframe) carries the downlink synchronization channel (DwPCH), and the purpose of the downlink pilot channel is to serve as downlink pilot and downlink synchronization signal. The signal transmitted by the DwPCH shall cover the entire target cell, and the signal shall be transmitted with a fixed power. Its transmission power value is issued by high-level signaling and broadcast in the cell. This time slot is composed of a SYNC_DL sequence of 64chips and a guard interval of 32chips. The UpPTS (Uplink Pilot Time Slot) carries an Uplink Synchronization Channel (UpPCH), and the purpose of the Uplink Pilot Channel is to realize uplink synchronization. When the terminal needs to establish a connection with the network side, it will first transmit the UpPCH, and after getting the response (FPACH) from the network, the terminal will send the RACH channel in the uplink. The uplink pilot time slot consists of a SYNC_UL sequence with a length of 128chips and a guard interval of 32chips. DwPTS, GP and UpPTS are special time slots of TD-SCDMA system, carrying special channels, and the length is fixed and cannot be changed. In TD-LTE, GP and UpPTS need to occupy at least one symbol, and DwPTS has variable length because its function is the same as that of other downlink time slots.
根据以上分析，TD-SCDMA中的DwPTS、GP、UpPTS长度固定，而TD-LTE中的DwPTS长度可变，为了提升TD-LTE的效率，DwPTS应根据TD-SCDMA的时隙配比进行合理的设置。According to the above analysis, the lengths of DwPTS, GP, and UpPTS in TD-SCDMA are fixed, while the length of DwPTS in TD-LTE is variable. set up.
TD-SCDMA在一个帧内有2次上下行时隙转换，GP和上下行业务时隙转换点之前是上行特殊时隙和上行业务时隙，GP之前和业务时隙转换点之后都是下行时隙，TD-SCDMA各时隙配比的上下行时间如下表。TD-SCDMA has 2 uplink and downlink time slot conversions in one frame. Before the GP and uplink and downlink business time slot conversion points are uplink special time slots and uplink business time slots. Before GP and after the business time slot conversion point are downlink time slots. time slot, the uplink and downlink time of each time slot ratio of TD-SCDMA is shown in the table below.
TD-LTE特殊子帧各配置的时间如下表：The configuration time of each TD-LTE special subframe is as follows:
发明内容 Contents of the invention
本发明的目的是针对现有技术的缺点，对TD-LTE与TD-SCDMA特殊子帧配置进行计算，提出一种提升TD-LTE与TD-SCDMA邻频共存容量的方法和装置，能够使TD-SCDMA的时隙配比为2∶4的情况下，得到TD-LTE特殊时隙配置方案，使得TD-LTE的容量最大提升10％以上，当TD-SCDMA时隙配比为5∶1配置情况下，使得TD-LTE下行容量提升40％以上。The purpose of the present invention is to address the shortcomings of the prior art, calculate the special subframe configuration of TD-LTE and TD-SCDMA, and propose a method and device for improving the coexistence capacity of TD-LTE and TD-SCDMA adjacent frequencies, which can make TD-LTE and TD-SCDMA - When the time slot ratio of SCDMA is 2:4, the TD-LTE special time slot configuration scheme is obtained, which makes the capacity of TD-LTE increase by more than 10%. When the TD-SCDMA time slot ratio is 5:1 configuration Under certain circumstances, the TD-LTE downlink capacity is increased by more than 40%.
根据本发明的一方面，提供了一种提升TD-LTE与TD-SCDMA邻频共存容量的的方法，包括步骤：According to one aspect of the present invention, a kind of method for promoting TD-LTE and TD-SCDMA adjacent frequency coexistence capacity is provided, comprising steps:
A.计算得到TD-LTE上下行时隙配比；A. Calculate the TD-LTE uplink and downlink time slot ratio;
B.计算得到TD-LTE特殊子帧的特殊时隙DwPTS的最大符号数；B. Calculate the maximum number of symbols of the special time slot DwPTS of the TD-LTE special subframe;
C.根据得到的TD-LTE特殊子帧的特殊时隙DwPTS的最大符号数，得到与TD-SCDMA邻频共存时TD-LTE的特殊时隙配置方案。C. According to the obtained maximum number of symbols of the special time slot DwPTS of the TD-LTE special subframe, the special time slot configuration scheme of TD-LTE when coexisting with TD-SCDMA adjacent frequency is obtained.
优选地，所述步骤A进一步包括：Preferably, said step A further includes:
根据TD-SCDMA的上下行时间选择TD-LTE的时隙配比；Select the time slot ratio of TD-LTE according to the uplink and downlink time of TD-SCDMA;
TD-LTE的上行子帧数为小于TD-SCDMA上行时间的最小整数，下行子帧数为小于TD-SCDMA下行时间的最小整数；The number of uplink subframes of TD-LTE is the smallest integer less than the uplink time of TD-SCDMA, and the number of downlink subframes is the smallest integer less than the downlink time of TD-SCDMA;
得到TD-SCDMA上下行时隙配比对应的TD-LTE上下行时隙配比。The TD-LTE uplink and downlink time slot ratio corresponding to the TD-SCDMA uplink and downlink time slot ratio is obtained.
优选地，所述得到TD-SCDMA上下行时隙配比对应的TD-LTE上下行时隙配比的步骤的时隙配比具体为：Preferably, the time slot ratio of the step of obtaining the TD-SCDMA uplink and downlink time slot ratio corresponding to the TD-LTE uplink and downlink time slot ratio is specifically:
当TD-SCDMA上下行时隙配比为2∶4时，TD-LTE上下行时隙配比为1∶3；When the TD-SCDMA uplink and downlink time slot ratio is 2:4, TD-LTE uplink and downlink time slot ratio is 1:3;
当TD-SCDMA上下行时隙配比为3∶3时，TD-LTE上下行时隙配比为2∶2；When TD-SCDMA uplink and downlink time slot ratio is 3:3, TD-LTE uplink and downlink time slot ratio is 2:2;
当TD-SCDMA上下行时隙配比为4∶2时，TD-LTE上下行时隙配比为2∶2；When the TD-SCDMA uplink and downlink time slot ratio is 4:2, TD-LTE uplink and downlink time slot ratio is 2:2;
当TD-SCDMA上下行时隙配比为5∶1时，TD-LTE上下行时隙配比为3∶1。When the TD-SCDMA uplink and downlink time slot ratio is 5:1, the TD-LTE uplink and downlink time slot ratio is 3:1.
优选地，所述步骤B进一步包括：Preferably, said step B further comprises:
当TD-LTE下行时间不大于TD-SCDMA下行时间和TD-LTE上行时间不大于TD-SCDMA上行时间时，计算得到TD-LTE的DwPTS；When the TD-LTE downlink time is not greater than the TD-SCDMA downlink time and the TD-LTE uplink time is not greater than the TD-SCDMA uplink time, calculate the DwPTS of TD-LTE;
根据得到DwPTS的最大可能值计算DwPTS最大可能的符号数。Calculate the maximum possible symbol number of DwPTS according to the obtained maximum possible value of DwPTS.
优选地，所述根据得到DwPTS的最大可能值计算DwPTS最大可能的符号数的步骤具体为：Preferably, the step of calculating the maximum possible number of symbols of DwPTS according to the maximum possible value of DwPTS is specifically:
TD-SCDMA采用2∶4或1∶5时隙配比，TD-SCDMA adopts 2:4 or 1:5 time slot ratio,
短CP时，与TD-SCDMA共存时TD-LTE特殊子帧的特殊时隙DwPTS符号数为6；When the CP is short, the number of DwPTS symbols in the special time slot of the TD-LTE special subframe is 6 when coexisting with TD-SCDMA;
长CP时，与TD-SCDMA共存时TD-LTE特殊子帧的特殊时隙DwPTS符号数为5。When the CP is long, the number of DwPTS symbols in the special time slot of the TD-LTE special subframe is 5 when it coexists with TD-SCDMA.
优选地，所述步骤C的特殊时隙配置方案具体为：Preferably, the special time slot configuration scheme in step C is specifically:
当TD-LTE帧结构为短CP时，所述TD-LTE特殊时隙配置方案为When the TD-LTE frame structure is a short CP, the TD-LTE special time slot configuration scheme is
当TD-LTE帧结构为长CP时，所述TD-LTE特殊时隙配置方案为When the TD-LTE frame structure is a long CP, the TD-LTE special time slot configuration scheme is
根据本发明另一方面，还提供了一种提升TD-LTE与TD-SCDMA邻频共存容量的装置，包括TD-LTE时隙配比计算单元、TD-LTE特殊子帧的特殊时隙DwPTS最大符号数计算单元和TD-LTE特殊时隙配置方案计算单元，其中According to another aspect of the present invention, a device for improving the co-existence capacity of TD-LTE and TD-SCDMA adjacent frequencies is also provided, including a TD-LTE time slot allocation calculation unit, a special time slot DwPTS of a TD-LTE special subframe with a maximum Symbol number calculation unit and TD-LTE special time slot configuration scheme calculation unit, wherein
所述TD-LTE时隙配比计算单元，用于计算TD-LTE上下行时隙配比；The TD-LTE time slot ratio calculation unit is used to calculate the TD-LTE uplink and downlink time slot ratio;
所述TD-LTE特殊子帧的特殊时隙DwPTS最大符号数计算单元，用于计算TD-LTE特殊子帧最长时间；The special time slot DwPTS maximum number of symbols calculation unit of the TD-LTE special subframe is used to calculate the longest time of the TD-LTE special subframe;
所述TD-LTE特殊时隙配置方案计算单元，用于根据得到的DwPTS最大符号数，计算得到与TD-SCDMA邻频共存时TD-LTE的特殊时隙配置方案。The TD-LTE special time slot configuration scheme calculation unit is used to calculate the TD-LTE special time slot configuration scheme when coexisting with TD-SCDMA adjacent frequencies according to the obtained maximum number of DwPTS symbols.
优选地，所述TD-LTE时隙配比计算单元进一步用于：Preferably, the TD-LTE time slot allocation calculation unit is further used for:
根据TD-SCDMA的上下行时间选择TD-LTE的时隙配比；Select the time slot ratio of TD-LTE according to the uplink and downlink time of TD-SCDMA;
TD-LTE的上行子帧数为小于TD-SCDMA上行时间的最小整数，下行子帧数为小于TD-SCDMA下行时间的最小整数；The number of uplink subframes of TD-LTE is the smallest integer less than the uplink time of TD-SCDMA, and the number of downlink subframes is the smallest integer less than the downlink time of TD-SCDMA;
得到TD-SCDMA上下行时隙配比对应的TD-LTE上下行时隙配比。The TD-LTE uplink and downlink time slot ratio corresponding to the TD-SCDMA uplink and downlink time slot ratio is obtained.
优选地，所述TD-LTE时隙配比计算单元进一步用于：Preferably, the TD-LTE time slot allocation calculation unit is further used for:
根据所述得到TD-SCDMA上下行时隙配比计算得到对应的TD-LTE上下行时隙配比的步骤的时隙配比为：Obtain the time slot ratio of the step of corresponding TD-LTE uplink and downlink timeslot ratio calculated according to the TD-SCDMA uplink and downlink timeslot ratio is:
当TD-SCDMA上下行时隙配比为2∶4时，TD-LTE上下行时隙配比为1∶3；When the TD-SCDMA uplink and downlink time slot ratio is 2:4, TD-LTE uplink and downlink time slot ratio is 1:3;
当TD-SCDMA上下行时隙配比为3∶3时，TD-LTE上下行时隙配比为2∶2；When TD-SCDMA uplink and downlink time slot ratio is 3:3, TD-LTE uplink and downlink time slot ratio is 2:2;
当TD-SCDMA上下行时隙配比为4∶2时，TD-LTE上下行时隙配比为2∶2；When the TD-SCDMA uplink and downlink time slot ratio is 4:2, TD-LTE uplink and downlink time slot ratio is 2:2;
当TD-SCDMA上下行时隙配比为5∶1时，TD-LTE上下行时隙配比为3∶1。When the TD-SCDMA uplink and downlink time slot ratio is 5:1, the TD-LTE uplink and downlink time slot ratio is 3:1.
优选地，所述TD-LTE特殊子帧的特殊时隙DwPTS最大符号数计算单元进一步用于：Preferably, the special time slot DwPTS maximum symbol number calculation unit of the TD-LTE special subframe is further used for:
根据TD-LTE下行时间不大于TD-SCDMA下行时间和TD-LTE上行时间不大于TD-SCDMA上行时间，计算得到TD-LTE的DwPTS最长时间；According to the TD-LTE downlink time is not greater than the TD-SCDMA downlink time and the TD-LTE uplink time is not greater than the TD-SCDMA uplink time, calculate the longest DwPTS time of TD-LTE;
根据得到DwPTS的最长时间计算DwPTS最大符号数。Calculate the maximum number of DwPTS symbols according to the longest time to obtain the DwPTS.
优选地，所述根据得到DwPTS的最长时间计算DwPTS最大符号数具体为：Preferably, the calculation of the maximum number of DwPTS symbols according to the longest time of obtaining DwPTS is specifically:
TD-SCDMA采用2∶4或1∶5时隙配比，TD-SCDMA adopts 2:4 or 1:5 time slot ratio,
短CP时，与TD-SCDMA共存时TD-LTE的DwPTS符号数为6；When the CP is short, the number of DwPTS symbols of TD-LTE when coexisting with TD-SCDMA is 6;
长CP时，与TD-SCDMA共存时TD-LTE的DwPTS符号数为5。When the CP is long, the number of DwPTS symbols of TD-LTE when coexisting with TD-SCDMA is 5.
优选地，所述TD-LTE特殊时隙配置方案计算单元计算得到的特殊时隙配置方案具体为：Preferably, the special time slot configuration calculated by the TD-LTE special time slot configuration calculation unit is specifically:
当TD-LTE帧结构为短CP时，所述TD-LTE特殊时隙配置方案为When the TD-LTE frame structure is a short CP, the TD-LTE special time slot configuration scheme is
当TD-LTE帧结构为长CP时，所述TD-LTE特殊时隙配置方案为When the TD-LTE frame structure is a long CP, the TD-LTE special time slot configuration scheme is
本发明的技术效果在于：Technical effect of the present invention is:
当TD-SCDMA时隙配比为2∶4配置情况下，本发明提出的TD-LTE时隙配比方案特殊时隙可用符号数为6，可以传送数据业务，能够有效提升下行容量；当TD-SCDMA时隙配比为5∶1配置情况下，本发明提出的时隙配比方案特殊时隙可用符号数为6，可以传送数据业务，也能够有效提升下行容量。When the TD-SCDMA time slot ratio is configured as 2:4, the TD-LTE time slot ratio scheme proposed by the present invention has a special time slot with 6 available symbols, which can transmit data services and effectively improve the downlink capacity; when TD - When the SCDMA time slot ratio is 5:1, the number of symbols available for the special time slot in the time slot ratio scheme proposed by the present invention is 6, which can transmit data services and effectively improve the downlink capacity.
本发明的其它特征和优点将在随后的说明书中阐述，并且，部分地从说明书中变得显而易见，或者通过实施本发明而了解。本发明的目的和其他优点可通过在所写的说明书、权利要求书、以及附图中所特别指出的结构来实现和获得。Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
下面通过附图和实施例，对本发明的技术方案做进一步的详细描述。The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.
附图说明 Description of drawings
附图用来提供对本发明的进一步理解，并且构成说明书的一部分，与本发明的实施例一起用于解释本发明，并不构成对本发明的限制。在附图中：The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, and are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the attached picture:
图1是TD-LTE帧结构编码示意图。Figure 1 is a schematic diagram of TD-LTE frame structure encoding.
图2是本发明一种提升TD-LTE与TD-SCDMA邻频共存容量方法的流程图。Fig. 2 is a flow chart of a method for improving the co-existence capacity of TD-LTE and TD-SCDMA adjacent frequency in the present invention.
图3是本发明中一种提升TD-LTE与TD-SCDMA邻频共存容量装置的结构示意图。Fig. 3 is a schematic structural diagram of a device for improving the coexistence capacity of adjacent frequencies of TD-LTE and TD-SCDMA in the present invention.
具体实施方式 detailed description
以下结合附图对本发明的优选实施例进行说明，应当理解，此处所描述的优选实施例仅用于说明和解释本发明，并不用于限定本发明。The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.
本发明的核心思想在于根据对TD-SCDMA和TD-LTE时隙配比方案的分析，得到TD-SCDMA和TD-LTE邻频共存条件为：Core idea of the present invention is according to the analysis to TD-SCDMA and TD-LTE time slot ratio scheme, obtains TD-SCDMA and TD-LTE adjacent frequency coexistence condition as:
1.基于保持TD-SCDMA和TD-LTE的设计覆盖距离基本相同的原则，TD-SCDMA的保护间隔不小于0.075us，TD-LTE的保护间隔不小于0.071us；1. Based on the principle of keeping the design coverage distance of TD-SCDMA and TD-LTE basically the same, the guard interval of TD-SCDMA is not less than 0.075us, and the guard interval of TD-LTE is not less than 0.071us;
2.基于TD-SCDMAGP不变、TD-LTEGP可变的原则，TD-LTE的上、下行时间小于TD-SCDMA的上、下行时间；2. Based on the principle that TD-SCDMAGP is unchanged and TD-LTEGP is variable, the uplink and downlink time of TD-LTE is shorter than the uplink and downlink time of TD-SCDMA;
3.TD-LTE的UpPTS最小占用1个OFDM符号，即短CP情况下不小于0.071us，长CP情况下不小于0.0833us。3. The UpPTS of TD-LTE occupies at least 1 OFDM symbol, that is, not less than 0.071us in the case of short CP, and not less than 0.0833us in the case of long CP.
如图2所示，根据分析得到的TD-SCDMA和TD-LTE的邻频共存条件，得到配置最优的TD-LTE的特殊时隙方法如下：As shown in Figure 2, according to the adjacent frequency coexistence conditions of TD-SCDMA and TD-LTE obtained through analysis, the method of obtaining the optimal TD-LTE special time slot is as follows:
步骤101、计算TD-LTE上下行时隙配比，具体为根据TD-SCDMA的上下行时间选择TD-LTE的时隙配比，TD-LTE的一个普通子帧时长为1ms，TD-LTE的上行子帧数为小于TD-SCDMA上行时间的最小整数，下行子帧数为小于TD-SCDMA下行时间的最小整数，即Step 101, calculate the TD-LTE uplink and downlink time slot ratio, specifically for selecting the TD-LTE time slot ratio according to the TD-SCDMA uplink and downlink time, a common subframe duration of TD-LTE is 1ms, TD-LTE The number of uplink subframes is the smallest integer less than the TD-SCDMA uplink time, and the number of downlink subframes is the smallest integer less than the TD-SCDMA downlink time, namely
N(TD-LTESubfrme)U＝int(T(TD-SCDMA)U)N(TD-LTESubfrme) U ＝int(T(TD-SCDMA) U )
N(TD-LTESubfrme)D＝int(T(TD-SCDMA)D)N(TD-LTE Subfrme) D ＝int(T(TD-SCDMA) D )
根据以上分析，TD-SCDMA上下行时隙配比对应的TD-LTE上下行时隙配比如下表：According to the above analysis, the TD-SCDMA uplink and downlink time slot ratio corresponds to the TD-LTE uplink and downlink time slot ratio as follows:
步骤102、计算TD-LTE特殊子帧的特殊时隙DwPTS最大符号数：考虑到TD-LTE的最小保护间隔与TD-SCDMA的最小保护间隔基本相同，TD-LTE特殊子帧时间设置要求如下Step 102. Calculate the maximum number of symbols in the special time slot DwPTS of the TD-LTE special subframe: Considering that the minimum guard interval of TD-LTE is basically the same as the minimum guard interval of TD-SCDMA, the TD-LTE special subframe time setting requirements are as follows
TD-LTE下行时间应不大于TD-SCDMA下行时间，即TD-LTE downlink time should not be longer than TD-SCDMA downlink time, that is
T(TD-LTE)DwPTS≤T(TD-SCDMA)D-N(TD-LTESubfrme)D T(TD-LTE) DwPTS ≤T(TD-SCDMA) D -N(TD-LTE Subfrme) D
T(TD-LTE)DwPTS≤T(TD-SCDMA)D-int(T(TD-SCDMA)D)T(TD-LTE) DwPTS ≤T(TD-SCDMA) D -int(T(TD-SCDMA) D )
T(TD-LTE)DwPTS≤mod(T(TD-SCDMA)D，1)T(TD-LTE) DwPTS ≤ mod(T(TD-SCDMA) D , 1)
TD-LTE上行时间应不大于TD-SCDMA上行时间，即TD-LTE uplink time should not be longer than TD-SCDMA uplink time, that is
T(TD-LTE)UpPTS≤mod(T(TD-SCDMA)U，1)T(TD-LTE) UpPTS ≤ mod(T(TD-SCDMA) U , 1)
T(TD-LTE)UpPTS≤1-mod(T(TD-SCDMA)D，1)-T(TD-SCDMA)GP T(TD-LTE) UpPTS ≤1-mod(T(TD-SCDMA) D , 1)-T(TD-SCDMA) GP
1-T(TD-LTE)DwPTS-T(TD-LTE)Gp≤0.925-mod(T(TD-SCDMA)D，1)1-T(TD-LTE) DwPTS -T(TD-LTE) Gp ≤0.925-mod(T(TD-SCDMA) D , 1)
T(TD-LTE)DwPTS≥0.075-T(TD-LTE)Gp-mod(T(TD-SCDMA)D，1)T(TD-LTE) DwPTS ≥0.075-T(TD-LTE) Gp -mod(T(TD-SCDMA) D , 1)
得到TD-LTE的DwPTS要求如下：The DwPTS requirements for TD-LTE are as follows:
mod(T(TD-SCDMA)D，1)≥T(TD-LTE)DwPTS≥0.075-T(TD-LTE)Gp-mod(T(TD-SCDMA)D，1)mod(T(TD-SCDMA) D , 1)≥T(TD-LTE) DwPTS ≥0.075-T(TD-LTE) Gp -mod(T(TD-SCDMA) D , 1)
根据得到DwPTS的最大可能值计算DwPTS最大可能的符号数：Calculate the maximum possible number of symbols of DwPTS according to the maximum possible value of DwPTS:
N(TD-LTE)DwPTS＝int(T(TD-LTE)DwPTS/T(TD-LTE)symbol)N(TD-LTE) DwPTS ＝int(T(TD-LTE) DwPTS /T(TD-LTE) symbol )
T(TD-LTE)symbol为符号时长，短CP情况下为0.071us，长CP情况下为0.0833us。T(TD-LTE) symbol is the symbol duration, which is 0.071us in the case of short CP and 0.0833us in the case of long CP.
计算结果如下表：The calculation results are as follows:
根据以上分析，TD-SCDMA采用2∶4、1∶5时隙配比时，TD-LTE与TD-SCDMA共存时最优的DwPTS符号数为6(短CP)/5(长CP)。According to the above analysis, when TD-SCDMA adopts the time slot ratio of 2:4 and 1:5, the optimal number of DwPTS symbols when TD-LTE and TD-SCDMA coexist is 6 (short CP)/5 (long CP).
步骤103、得到TD-LTE可采用的特殊时隙配置方案如下表：Step 103, obtain the following table of the special time slot configuration scheme that TD-LTE can adopt:
因此，在TD-SCDMA时隙配比为2∶4配置情况下，原方案DwPTS最大符号数为3，不能传送业务数据，本发明提出的方案特殊时隙可用符号数为6，可以传送数据业务，下行容量提升6/(4*14)＝10.7％；Therefore, when the TD-SCDMA time slot configuration is 2:4, the original scheme DwPTS has a maximum number of symbols of 3 and cannot transmit service data. The scheme proposed by the present invention has 6 symbols available for special time slots and can transmit data services. , the downlink capacity is increased by 6/(4*14)=10.7%;
在TD-SCDMA时隙配比为5∶1配置情况下，原方案DwPTS最大符号数为3，不能传送业务数据，本发明提出的方案特殊时隙可用符号数为6，可以传送数据业务，下行容量提升6/14＝42.8％。In the case of a TD-SCDMA time slot configuration of 5:1, the original scheme DwPTS has a maximum number of symbols of 3 and cannot transmit service data. The number of symbols available for special time slots in the scheme proposed by the present invention is 6 and can transmit data services. The capacity is increased by 6/14=42.8%.
本发明还提供了一种提升TD-LTE与TD-SCDMA邻频共存容量的装置，如图3所示，包括TD-LTE时隙配比计算单元、TD-LTE特殊子帧的特殊时隙DwPTS最大符号数计算单元和TD-LTE特殊时隙配置方案计算单元，其中The present invention also provides a device for improving the co-existence capacity of TD-LTE and TD-SCDMA adjacent frequencies, as shown in Figure 3, including a TD-LTE time slot ratio calculation unit, a special time slot DwPTS of a TD-LTE special subframe The calculation unit of the maximum number of symbols and the calculation unit of the TD-LTE special time slot configuration scheme, wherein
所述TD-LTE时隙配比计算单元，用于计算TD-LTE上下行时隙配比；The TD-LTE time slot ratio calculation unit is used to calculate the TD-LTE uplink and downlink time slot ratio;
所述TD-LTE特殊子帧的特殊时隙DwPTS最大符号数计算单元，用于计算TD-LTE特殊子帧的特殊时隙DwPTS的最大符号数；The special time slot DwPTS maximum number of symbols calculation unit of the TD-LTE special subframe is used to calculate the maximum number of symbols of the special time slot DwPTS of the TD-LTE special subframe;
所述TD-LTE特殊时隙配置方案计算单元，用于根据得到的TD-LTE特殊子帧的特殊时隙DwPTS的最大符号数，计算得到与TD-SCDMA邻频共存时TD-LTE的特殊时隙配置方案。The TD-LTE special time slot configuration calculation unit is used to calculate the special time slot of TD-LTE when co-existing with TD-SCDMA adjacent frequencies according to the maximum number of symbols of the special time slot DwPTS of the obtained TD-LTE special subframe. Gap configuration scheme.
本领域普通技术人员可以理解：实现上述方法实施例的全部或部分步骤可以通过程序指令相关的硬件来完成，前述的程序可以存储于一计算机可读取存储介质中，该程序在执行时，执行包括上述方法实施例的步骤；而前述的存储介质包括：ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。Those of ordinary skill in the art can understand that all or part of the steps for realizing the above-mentioned method embodiments can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the It includes the steps of the above method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other various media that can store program codes.
最后应说明的是：以上所述仅为本发明的优选实施例而已，并不用于限制本发明，尽管参照前述实施例对本发明进行了详细的说明，对于本领域的技术人员来说，其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。Finally, it should be noted that: the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still The technical solutions recorded in the foregoing embodiments may be modified, or some technical features thereof may be equivalently replaced. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.
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