CN1855767B - Method for Establishing Large Radius Cell in Time Division Synchronous Code Division Multiple Access Communication System - Google Patents
Method for Establishing Large Radius Cell in Time Division Synchronous Code Division Multiple Access Communication System Download PDFInfo
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Abstract
Description
技术领域technical field
本发明涉及时分同步码分多址(TD-SCDMA)技术，特别是指一种在TD-SCDMA通信系统中建立大半径小区的方法。The invention relates to time division synchronous code division multiple access (TD-SCDMA) technology, in particular to a method for establishing large-radius cells in the TD-SCDMA communication system.
背景技术Background technique
TD-SCDMA通信系统是一种在同步模式下工作的、具有自适应CDMA特点的、先进的TDMA通信系统。TD-SCDMA通信系统中的一个帧是10毫秒(ms)间隔，每个帧又分为两个5ms的子帧，如图1A所示，TD-SCDMA通信系统中的码片速率是每秒1.28兆码片(Mchip)，一个子帧共容纳6400个码片。每个子帧分成7个TS0时隙至TS6时隙，另外还包括96个码片的下行导频(DwPTS)时隙、96个码片的保护间隔(GP)时隙和160个码片的上行导频(UpPTS)时隙三个特殊时隙，用作同步处理。每个子帧的时隙中，配置TS0时隙总是用于下行链路，TS1时隙总是用于上行链路，TS2时隙至TS6时隙是用于上行链路还是用于下行链路可灵活配置。TD-SCDMA communication system is an advanced TDMA communication system that works in synchronous mode and has the characteristics of adaptive CDMA. A frame in the TD-SCDMA communication system is 10 milliseconds (ms) interval, and each frame is divided into two 5ms subframes, as shown in Figure 1A, the chip rate in the TD-SCDMA communication system is 1.28 per second Megachip (Mchip), a subframe contains 6400 chips in total. Each subframe is divided into 7 TS0 time slots to TS6 time slots, and also includes a 96-chip downlink pilot (DwPTS) time slot, a 96-chip guard interval (GP) time slot, and a 160-chip uplink Pilot (UpPTS) time slot Three special time slots are used for synchronization processing. In the time slots of each subframe, the TS0 time slot is always used for the downlink, the TS1 time slot is always used for the uplink, and whether the TS2 to TS6 time slots are used for the uplink or the downlink Can be flexibly configured.
图1B示出了现有的TD-SCDMA通信系统中上行导频时隙结构示意图，如图1B所示，上行导频时隙由128个码片的上行随机接入(SYNC UL)信号时隙和32码片的保护间隔(GP)组成。Figure 1B shows a schematic diagram of the structure of the uplink pilot time slot in the existing TD-SCDMA communication system. As shown in Figure 1B, the uplink pilot time slot consists of uplink random access (SYNC UL) signal time slots of 128 chips and a guard interval (GP) of 32 chips.
TD-SCDMA通信系统中，通常基站将保护间隔时隙和上行导频时隙作为上行随机接入检测时隙，TS1时隙作为上行业务时隙，通信终端可以固定时间提前量发送上行随机接入信号，或根据下行链路损耗、小区半径等信息计算出的时间提前量发送上行随机接入信号，这样通信终端发送上行随机接入信号的位置就相应落在与时间提前量相对应的时隙中的某一位置上。在这种情况下，TD-SCDMA通信系统会出现很多问题，下面对TD-SCDMA通信系统中会出现的一些问题进行描述。In the TD-SCDMA communication system, usually the base station uses the guard interval time slot and the uplink pilot time slot as the uplink random access detection time slot, and the TS1 time slot as the uplink service time slot, and the communication terminal can send the uplink random access time slot with a fixed timing advance Signals, or send uplink random access signals according to the time advance calculated according to the downlink loss, cell radius and other information, so that the position where the communication terminal sends the uplink random access signal falls in the time slot corresponding to the time advance in a certain position. In this case, there will be many problems in the TD-SCDMA communication system, and some problems in the TD-SCDMA communication system will be described below.
当通信终端以固定时间提前量发送上行随机接入信号时，如果通信终端发送上行随机接入信号的位置落在保护间隔时隙中，则在小区半径大于11.25千米(Km)时，基站接收到的上行随机接入信号会部分落在上行导频时隙尾部的32个码片的保护间隔中，甚至有可能部分落在TS1时隙，参见图2，这将非常不利于基站对上行随机接入信号的检测，同时也可能会对上行业务信号造成干扰；当小区半径大于11.25千米时，为避免出现这些问题，通信终端将发送上行随机接入信号的位置继续提前，这样，通信终端发送上行随机接入信号的位置就会落在下行导频时隙、甚至是TS0时隙，因此，通信终端发送的上行随机接入信号就会对该通信终端附近接收下行导频信号或TS0信号的其他通信终端造成干扰。When the communication terminal sends the uplink random access signal with a fixed timing advance, if the position where the communication terminal sends the uplink random access signal falls in the guard interval time slot, then when the cell radius is greater than 11.25 kilometers (Km), the base station receives The received uplink random access signal will partly fall in the guard interval of 32 chips at the end of the uplink pilot slot, and may even partly fall in the TS1 time slot, see Figure 2, which will be very unfavorable for the base station to uplink random access signals. The detection of the access signal may also cause interference to the uplink service signal; when the cell radius is greater than 11.25 kilometers, in order to avoid these problems, the communication terminal will continue to advance the location of the uplink random access signal, so that the communication terminal The position where the uplink random access signal is sent will fall in the downlink pilot time slot, or even the TS0 time slot. Therefore, the uplink random access signal sent by the communication terminal will receive the downlink pilot signal or TS0 signal near the communication terminal. cause interference to other communication terminals.
当通信终端根据下行链路损耗、小区半径等信息计算出的时间提前量发送上行随机接入信号时，如果小区半径大于11.25千米时，通信终端发送上行随机接入信号的位置会落在下行导频时隙、甚至是TS0时隙，这样，通信终端发送的上行随机接入信号就会对该通信终端附近接收下行导频信号或TS0信号的其他通信终端造成干扰。另外，由于环境、建筑物遮挡等原因导致的多径、信号衰落等问题的存在，利用下行链路损耗估计发送上行随机接入信号的时间提前量并不准确，在环境比较复杂的情况下，甚至会存在很大误差。在这种情况下，通信终端发送上行随机接入信号的位置很可能会落在下行导频时隙、甚至是TS0时隙，这样，通信终端发送的上行随机接入信号也将对该通信终端附近接收下行导频信号或TS0信号的其他通信终端造成干扰，这种问题在高楼林立、业务密集的小区尤为严重。如果小区半径大于30千米，则通信终端发送上行业务信号的位置也需要提前，这样就可能落在下行导频时隙、甚至是TS0时隙，这样，通信终端发送的上行业务信号也将对该通信终端附近接收下行导频信号或TS0信号的其他通信终端造成干扰。When the communication terminal sends the uplink random access signal based on the timing advance calculated by downlink loss, cell radius and other information, if the cell radius is greater than 11.25 kilometers, the position where the communication terminal sends the uplink random access signal will fall on the downlink In this way, the uplink random access signal sent by the communication terminal will cause interference to other communication terminals near the communication terminal that receive the downlink pilot signal or TS0 signal. In addition, due to the existence of problems such as multipath and signal fading caused by the environment, building occlusion, etc., it is not accurate to use the downlink loss to estimate the timing advance of sending the uplink random access signal. In the case of a complex environment, There may even be large errors. In this case, the position where the communication terminal sends the uplink random access signal is likely to fall in the downlink pilot time slot, or even the TS0 time slot. In this way, the uplink random access signal sent by the communication terminal will also affect the communication terminal Interference is caused by other communication terminals receiving downlink pilot signals or TS0 signals nearby. This problem is especially serious in residential areas with many tall buildings and dense services. If the radius of the cell is greater than 30 kilometers, the position where the communication terminal sends the uplink service signal also needs to be advanced, so it may fall in the downlink pilot time slot, or even the TS0 time slot. In this way, the uplink service signal sent by the communication terminal will also be on the Interference is caused by other communication terminals receiving downlink pilot signals or TS0 signals near the communication terminal.
无论通信终端根据固定时间提前量还是计算出的时间提前量发送上行随机接入信号，当通信终端将发送上行随机接入信号的位置落在下行导频时隙或TS0时隙时，除非通信终端的射频为双工方式，否则，通信终端将无法同时接收下行导频信号或TS0信号，但是将通信终端的射频做成双工方式，又会增加通信终端硬件的实现复杂度，并提高通信终端的成本。Regardless of whether the communication terminal sends the uplink random access signal according to the fixed timing advance or the calculated timing advance, when the communication terminal sends the uplink random access signal at the downlink pilot time slot or TS0 time slot, unless the communication terminal The radio frequency of the communication terminal is duplex mode, otherwise, the communication terminal will not be able to receive the downlink pilot signal or TS0 signal at the same time, but making the radio frequency of the communication terminal duplex mode will increase the complexity of the hardware implementation of the communication terminal and improve the performance of the communication terminal. the cost of.
对于以上所述问题，目前还没有有效可行的解决方法，只是考虑到以下几点因素，允许上行随机接入信号存在对下行信号的干扰：其一是一个通信终端在其他通信终端附近的概率比较低，针对大半径小区尤其如此；其二是下行导频信号并不需要每帧都接收，在小区搜索阶段，偶尔几次收不到下行导频信号，对小区搜索的性能影响不大；其三是通信终端只有在随机接入和切换时才会发送上行随机接入信号，通信终端发送上行随机接入信号的概率比较低，因此，对其他信号的影响就比较低。不过即使如此，最大的小区半径也只能达到22.5千米，如果需要建立半径大于22.5千米的小区，就只能允许上行随机接入信号对下行导频信号和TS0信号的干扰的存在，以及TS1信号对下行导频信号和TS0信号的干扰的存在，因此，目前普遍的解决方法是避免建立大半径小区，以避免各种干扰问题的渐趋严重。For the above-mentioned problems, there is no effective and feasible solution at present, but the following factors are considered to allow the interference of the uplink random access signal to the downlink signal: one is the probability comparison of a communication terminal near other communication terminals Low, especially for large-radius cells; the second is that the downlink pilot signal does not need to be received every frame. During the cell search phase, the downlink pilot signal is occasionally not received several times, which has little impact on the performance of the cell search; The third is that the communication terminal will only send the uplink random access signal during random access and switching, and the probability of the communication terminal sending the uplink random access signal is relatively low, so the impact on other signals is relatively low. However, even so, the maximum cell radius can only reach 22.5 kilometers. If a cell with a radius greater than 22.5 kilometers needs to be established, the interference of the uplink random access signal to the downlink pilot signal and TS0 signal can only be allowed, and The TS1 signal interferes with the downlink pilot signal and the TS0 signal. Therefore, the current general solution is to avoid building large-radius cells, so as to avoid the seriousness of various interference problems.
发明内容Contents of the invention
有鉴于此，本发明的目的在于提供一种在TD-SCDMA通信系统中建立大半径小区的方法，在TD-SCDMA通信系统中建立大半径小区，并消除上行随机接入信号对下行信号的干扰。In view of this, the purpose of the present invention is to provide a method for setting up a large-radius cell in a TD-SCDMA communication system, to set up a large-radius cell in a TD-SCDMA communication system, and to eliminate the interference of uplink random access signals to downlink signals .
为了达到上述目的，本发明提供了一种在TD-SCDMA通信系统中建立大半径小区的方法，时分同步码分多址通信系统中的一个帧包括TS0时隙至TS6时隙、下行导频时隙、保护间隔时隙和上行导频时隙，该方法包含以下步骤：In order to achieve the above object, the present invention provides a method for establishing a large-radius cell in the TD-SCDMA communication system. A frame in the time division synchronous code division multiple access communication system includes TS0 time slot to TS6 time slot, downlink pilot time slot slot, guard interval time slot and uplink pilot time slot, the method includes the following steps:
A、将上行导频时隙和TS1时隙配置为上行随机接入检测时隙；A. Configure the uplink pilot time slot and the TS1 time slot as the uplink random access detection time slot;
B、基站在上行随机接入检测时隙检测通信终端发送的上行随机接入信号；B. The base station detects the uplink random access signal sent by the communication terminal in the uplink random access detection time slot;
C、通信终端在与时间提前量相对应的所述上行随机接入检测时隙中的位置上发送上行随机接入信号。C. The communication terminal sends an uplink random access signal at a position in the uplink random access detection time slot corresponding to the timing advance.
配置所述上行随机接入检测时隙进一步包括将保护间隔时隙也纳入上行随机接入检测的时隙范围。Configuring the uplink random access detection time slot further includes including the guard interval time slot into the uplink random access detection time slot range.
步骤A中所述配置是在基站中完成的。The configuration in step A is done in the base station.
该方法进一步包括：将TS2时隙至TS6时隙中任一时隙配置为上行业务时隙，基站在所述上行业务时隙检测通信终端发送的上行业务信号。The method further includes: configuring any time slot from TS2 to TS6 as an uplink service time slot, and the base station detects an uplink service signal sent by a communication terminal in the uplink service time slot.
所述时间提前量是设定的固定时间提前量。The timing advance is a set fixed timing advance.
所述时间提前量是通信终端根据链路损耗和小区半径计算出的。The timing advance is calculated by the communication terminal according to link loss and cell radius.
根据本发明提出的方法，将TS1时隙纳入上行随机接入检测的时隙范围，即将上行导频时隙和TS1时隙配置为上行随机接入检测时隙，进一步地，保护间隔时隙也可纳入上行随机接入检测的时隙范围，即将保护间隔时隙、上行导频时隙和TS1时隙配置为上行随机接入检测时隙，基站在该上行随机接入检测时隙检测通信终端发送的上行随机接入信号，这样，消除了上行随机接入信号对其他通信终端的下行信号的干扰，也不再影响该通信终端接收下行信号。由于不再将TS1时隙配置为上行业务时隙，也相应消除了TS1信号对其他通信终端的下行信号的干扰。根据本发明提出的方法，允许建立半径可达112.5千米的小区。According to the method proposed in the present invention, the TS1 time slot is included in the time slot range of the uplink random access detection, that is, the uplink pilot time slot and the TS1 time slot are configured as the uplink random access detection time slot, and further, the guard interval time slot is also It can be included in the range of time slots for uplink random access detection, that is, guard interval time slots, uplink pilot time slots and TS1 time slots are configured as uplink random access detection time slots, and the base station detects communication terminals in the uplink random access detection time slots The transmitted uplink random access signal, in this way, the interference of the uplink random access signal to the downlink signal of other communication terminals is eliminated, and the reception of the downlink signal by the communication terminal is no longer affected. Since the TS1 time slot is no longer configured as an uplink service time slot, the interference of the TS1 signal on the downlink signals of other communication terminals is correspondingly eliminated. According to the method proposed by the present invention, it is allowed to establish a cell with a radius of up to 112.5 kilometers.
另外，根据本发明提出的方法，将通信终端发送上行随机接入信号的位置落在上行导频时隙或保护间隔时隙，同样适用于半径小于11.25千米的小区，并且能够解决由于复杂环境下链路损耗估计不准确而引发的问题。In addition, according to the method proposed by the present invention, the position where the communication terminal sends the uplink random access signal falls on the uplink pilot time slot or the guard interval time slot, which is also applicable to cells with a radius of less than 11.25 kilometers, and can solve the problem caused by complex environments. Problems caused by inaccurate downlink loss estimation.
附图说明Description of drawings
图1A示出了现有的TD-SCDMA通信系统中子帧时隙结构示意图；FIG. 1A shows a schematic diagram of a subframe time slot structure in an existing TD-SCDMA communication system;
图1B示出了现有的TD-SCDMA通信系统中上行导频时隙结构示意图；Figure 1B shows a schematic diagram of the structure of the uplink pilot time slot in the existing TD-SCDMA communication system;
图2A示出了本发明中的TD-SCDMA通信系统中子帧时隙结构示意图；Fig. 2A shows the schematic diagram of subframe time slot structure in the TD-SCDMA communication system among the present invention;
图2B示出了本发明中的TD-SCDMA通信系统中上行导频时隙结构示意图。Fig. 2B shows a schematic diagram of the structure of the uplink pilot time slot in the TD-SCDMA communication system of the present invention.
具体实施方式Detailed ways
为使本发明的目的、技术方案和优点更加清楚，下面结合附图对本发明作进一步的详细描述。In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.
本发明中，不再将TS1时隙配置为上行业务时隙，而是将TS1时隙纳入上行随机接入检测的时隙范围，即将上行导频时隙和TS1时隙配置为上行随机接入检测时隙，基站在该上行随机接入检测时隙检测通信终端发送的上行随机接入信号，如图2A所示；进一步地，保护间隔时隙也可纳入上行随机接入检测的时隙范围，即将保护间隔时隙、上行导频时隙和TS1时隙配置为上行随机接入检测时隙，基站在该上行随机接入检测时隙检测通信终端发送的上行随机接入信号。In the present invention, the TS1 time slot is no longer configured as an uplink business time slot, but the TS1 time slot is included in the time slot range of uplink random access detection, that is, the uplink pilot time slot and TS1 time slot are configured as uplink random access The detection time slot, the base station detects the uplink random access signal sent by the communication terminal in the uplink random access detection time slot, as shown in Figure 2A; further, the guard interval time slot can also be included in the time slot range of the uplink random access detection , the guard interval time slot, the uplink pilot time slot and the TS1 time slot are configured as an uplink random access detection time slot, and the base station detects an uplink random access signal sent by a communication terminal in the uplink random access detection time slot.
图2B示出了本发明中的TD-SCDMA通信系统中上行导频时隙结构示意图，如图2B所示，上行随机接入检测时隙由160个码片的上行导频时隙和864个码片的TS1时隙组成，其中，上行导频时隙由128个码片的上行随机接入信号时隙和32码片的保护间隔组成。进一步地，上行随机接入检测时隙还可进一步包括96个码片的保护间隔时隙。Figure 2B shows a schematic diagram of the structure of the uplink pilot time slot in the TD-SCDMA communication system in the present invention, as shown in Figure 2B, the uplink random access detection time slot consists of uplink pilot time slots of 160 chips and 864 It is composed of TS1 time slots of chips, wherein the uplink pilot time slot is composed of uplink random access signal time slots of 128 chips and a guard interval of 32 chips. Further, the uplink random access detection time slot may further include a guard interval time slot of 96 chips.
通信终端发送上行随机接入信号时，可根据时间提前量，将发送上行随机接入信号的位置落在与固定时间提前量相对应的上行随机接入检测时隙中的位置上，如通信终端将发送上行随机接入信号的位置落在上行导频时隙或保护间隔时隙的某个位置上，这样，通信终端发送上行随机接入信号的位置不再会落在下行导频时隙、甚至是TS0时隙，也就消除了对该通信终端附近接收下行导频信号或TS0信号的其他通信终端的干扰。以上所述的时间提前量可为预先设定的固定时间提前量，也可为通信终端根据链路损耗、小区半径等信息计算出的时间提前量。另外，由于通信终端将发送上行随机接入信号的位置落在上行导频时隙或保护间隔时隙，则不再影响该通信终端接收下行信号。When the communication terminal sends the uplink random access signal, according to the time advance, the position for sending the uplink random access signal can be placed in the position of the uplink random access detection time slot corresponding to the fixed time advance. For example, the communication terminal The position for sending the uplink random access signal falls on a certain position of the uplink pilot time slot or the guard interval time slot, so that the position where the communication terminal sends the uplink random access signal no longer falls in the downlink pilot time slot, or even It is a TS0 time slot, which eliminates the interference of other communication terminals receiving downlink pilot signals or TS0 signals near the communication terminal. The aforementioned timing advance may be a preset fixed timing advance, or may be a timing advance calculated by the communication terminal based on information such as link loss and cell radius. In addition, since the communication terminal will send the uplink random access signal at the uplink pilot time slot or the guard interval time slot, it will no longer affect the communication terminal to receive the downlink signal.
由于本发明中将TS1时隙纳入上行随机接入检测的时隙范围，这样，TS1时隙已经不再是上行业务时隙，因此，也就消除了TS1信号对通信终端附近接收下行导频信号或TS0信号的其他通信终端的干扰。Because TS1 time slot is included in the time slot range of uplink random access detection in the present invention, like this, TS1 time slot is no longer the uplink service time slot, therefore, also just eliminated TS1 signal to receive downlink pilot signal near the communication terminal or interference from other communication terminals of the TS0 signal.
由于TS2时隙至TS6时隙可灵活配置，因此，可将TS2时隙至TS6时隙中的任一时隙配置为上行业务时隙，基站在配置好的上行业务时隙检测通信终端发送的上行业务信号；剩余时隙仍可灵活配置。Since TS2 time slot to TS6 time slot can be flexibly configured, any time slot from TS2 to TS6 time slot can be configured as an uplink service time slot, and the base station detects the uplink traffic sent by the communication terminal in the configured uplink service time slot. Service signals; the remaining time slots can still be flexibly configured.
根据本发明提出的方法，在将保护间隔时隙、上行导频时隙和TS1时隙配置为上行随机接入检测时隙时，由于上行导频时隙的长度为160个码片，TS1时隙的长度为864个码片，考虑到对TS2时隙的保护，可在TS1时隙的尾部留出32个码片的保护间隔，这样，如果通信终端将发送上行随机接入信号的位置落在保护间隔时隙的头部，则允许建立半径可达112.5千米的小区。According to the method proposed in the present invention, when the guard interval time slot, the uplink pilot time slot and the TS1 time slot are configured as the uplink random access detection time slot, since the length of the uplink pilot time slot is 160 chips, the TS1 time slot The length of the slot is 864 chips. Considering the protection of the TS2 time slot, a guard interval of 32 chips can be reserved at the end of the TS1 time slot. At the head of the guard interval time slot, it is allowed to establish a cell with a radius of up to 112.5 kilometers.
另外，根据本发明提出的方法，将通信终端发送上行随机接入信号的位置落在上行导频时隙或保护间隔时隙，同样适用于半径小于11.25千米的小区，并且能够解决由于复杂环境下链路损耗估计不准确而引发的问题。In addition, according to the method proposed by the present invention, the position where the communication terminal sends the uplink random access signal falls on the uplink pilot time slot or the guard interval time slot, which is also applicable to cells with a radius of less than 11.25 kilometers, and can solve the problem caused by complex environments. Problems caused by inaccurate downlink loss estimation.
与现有方法相比，虽然本发明不再将TS1时隙配置为上行业务时隙，减小了小区容量，但是半径较大的小区通常都建立在地广人稀的地方，位于小区内的通信终端数量较少，业务量也相对较低，因此，这种牺牲是合理的。Compared with the existing method, although the present invention no longer configures the TS1 time slot as an uplink business time slot, which reduces the capacity of the cell, the cell with a larger radius is usually established in a place with a large area and few people. The number of communication terminals is small, and the traffic volume is relatively low, so this sacrifice is reasonable.
总之，以上所述仅为本发明的较佳实施例而已，并非用于限定本发明的保护范围。In a word, the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention.
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| CN101102525B (en) * | 2007-08-06 | 2012-04-18 | 中兴通讯股份有限公司 | A method for generating the uplink and downlink conversion time of the second type of LTE frame structure |
| CN101217808B (en) * | 2008-01-17 | 2013-01-16 | 中兴通讯股份有限公司 | Transmitting method of random accessed signal in the wireless communication system |
| CN101771432B (en) * | 2008-12-26 | 2013-06-05 | 中兴通讯股份有限公司 | Demodulation method and system used in hybrid transmission of uplink pilot signal and service signal |
| CN102388668B (en) * | 2009-03-13 | 2015-06-03 | 华为技术有限公司 | Method and device for sending short random access signaling and method and device for carrying short random access channel |
| CN101940053B (en) * | 2009-04-03 | 2013-06-26 | 华为技术有限公司 | Method and apparatus of transmitting preamble signal for random access |
| EP2560446A1 (en) * | 2011-08-18 | 2013-02-20 | MStar Semiconductor, Inc | Reducing interference in wireless time division duplex systems by monitoring and limiting timing advance |
| CN104918336A (en) * | 2014-03-12 | 2015-09-16 | 中兴通讯股份有限公司 | Detection method, device and system of random access signals in interference environment |
| CN106851854B (en) * | 2017-03-22 | 2020-03-17 | 北京方天长久科技股份有限公司 | Serial communication frame structure and multi-node random access method |
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| CN1466286A (en) * | 2002-06-06 | 2004-01-07 | 华为技术有限公司 | Transmission method of high-speed packet service data based on time division duplex |
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| CN1466286A (en) * | 2002-06-06 | 2004-01-07 | 华为技术有限公司 | Transmission method of high-speed packet service data based on time division duplex |
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