CN101039134A - Method for realizing transmitter diversity using two remote RF units - Google Patents

Method for realizing transmitter diversity using two remote RF units Download PDF

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Publication number
CN101039134A
CN101039134A CN 200710074075 CN200710074075A CN101039134A CN 101039134 A CN101039134 A CN 101039134A CN 200710074075 CN200710074075 CN 200710074075 CN 200710074075 A CN200710074075 A CN 200710074075A CN 101039134 A CN101039134 A CN 101039134A
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rru
bbu
time
transmit diversity
downlink
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CN 200710074075
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赵国峰
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中兴通讯股份有限公司
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Abstract

The invention discloses a method of transmit diversity realized through two distal rf units comprising the following procedures: a. the time length needed to be compensated of the two rf units RRU is calculated by the baseband unit; b. BBU configurate the time parameter needed to be compensated to each RRU; c. RRU conducts descending time delay compensation according to the time delay parameter configurated by BBU. The invention can realize the transmit diversity function on the two RRU connected with the same BBU, and can also configurate casually two RRU to realize the transmit diversity function according to the needs of users and automatically realizes the measurement compensation of time delay through software, therefore reducing the workload of the hardware for debugging and calibration.

Description

一种利用两个远端射频单元实现发射分集的方法 A method for remote radio unit two achieve transmit diversity by

技术领域 FIELD

本发明涉及无线通信系统的BBU(Base Band Unit,基带单元)与RRU(Remote Ratio Unit,远端射频单元),尤其是利用两个RRU实现发射分集的方法。 BBU The present invention relates to a wireless communication system (Base Band Unit, baseband unit) and the RRU (Remote Ratio Unit, Remote Radio Unit), in particular with two RRU implemented method of transmit diversity.

背景技术 Background technique

近几年,无线通信系统的架构发展逐渐演进成这样一个趋势:将BBU与RRU分离,并通过远距离传输手段(如光纤、电缆)将BBU与多个RRU连接起来,然后将射频单元放置在各种需要的地方。 In recent years, the development of a wireless communication system architecture gradually evolved into a trend: the separated BBU and the RRU, and connected by the long distance transmission means (e.g., optical fiber, cable) a plurality of BBU and RRU, and then placed in a radio frequency unit a variety of local needs. 这种架构一方面提高了组网的灵活性,另一方面降低了网络的维护成本。 This architecture improves network flexibility on the one hand, on the other hand to reduce the maintenance costs of the network. 因此,这种架构越来越得到用户的认可,应用场合也越来越多。 Therefore, this architecture more and more user acceptance, more and more applications. 近几年,这种架构已经写入某些行业标准,如OBSAI、CPRI标准,并成为其一个重要的组成部分。 In recent years, this architecture has written some industry standards such as OBSAI, CPRI standard, and become an important part.

在使用这种架构组网时,要将多个RRU按照某种拓扑结构(如星型网、链型网)互相连接,并在此基础上完成BBU与多个RRU的通讯,实现BBU对RRU的控制与管理。 When such a network architecture, to a plurality of RRU in accordance with a certain topology (such as star network, chain network) connected to each other, and a plurality of BBU and RRU completion of communication on this basis, to achieve BBU RRU the control and management.

在无线通信系统中,通常要求实现发射分集的两支天线之间的发射时间差在一定范围之内。 In a wireless communication system, it is generally required to achieve a transmission time between the two antenna transmit diversity difference is within a certain range. 例如在WCDMA无线通信系统中,3GPPTS25.104就明确要求主、分集天线之间的发射时间差必须小于1/4码片。 For example, in a WCDMA wireless communication system, 3GPPTS25.104 clearly the main claim, a difference between the transmission time diversity antenna must be less than 1/4 chip. 在传统基站系统中实现发射分集时,主、分集的两个通道通常是在一块单板上或在一套时钟系统的同步下的,因此很容易实现两只天线的同步发射。 In the conventional base station system to achieve transmit diversity, the master, two diversity channels are generally a single board or a clock in the synchronous system, it is easy to synchronize two transmit antennas. 而在BBU-RRU的架构体系中,通常从成本与实现的技术难度考虑,一个RRU一般只支持单天线发射。 In the BBU-RRU architecture system, usually associated with technical difficulty of implementation from a cost, a RRU generally only supports single antenna. 如何利用2个RRU实现发射分集功能,即如何实现两个RRU的两只天线的同步发射,目前还没有实现方法。 How to use two RRU achieve transmit diversity function, i.e. how to synchronize two RRU two transmit antennas, there is no implementation.

发明内容 SUMMARY

本发明所要解决的技术问题是提供一种利用两个RRU实现发射分集的方法。 The present invention solves the technical problem is to provide an RRU using two methods to achieve transmit diversity.

为解决上述技术问题,本发明是通过以下技术方案实现的:一种利用两个远端射频单元实现发射分集的方法,包括以下步骤:a、BBU计算两个RRU需要补偿的时间长度;b、BBU将需要补偿的时间参数配置给各个RRU;c、RRU根据BBU配置的延时参数进行下行时延的补偿。 To solve the above problems, the present invention is achieved by the following technical solution: A method for achieving two remote radio unit using the transmit diversity, comprising the steps of: a length, calculate the BBU RRU two time needs to be compensated; B, BBU will need to compensate for time parameters to each RRU; c, RRU downlink delay compensating delay parameter BBU according to configuration.

其中,所述步骤a进一步包括:a1、BBU测量其与两个RRU之间的各时间段;a2、根据上述测量数据,计算BBU至各个RRU的下行的时延值;a3、根据步骤b中所得的下行时延值,BBU计算各个RRU需要补偿的时间长度。 Wherein the step a further comprises: a1, BBU time period between each measurement with two RRU; A2, based on the measured data, calculate each BBU to the RRU downlink delay value; A3, according to step b, the resulting downlink delay value, BBU calculate the length of time of each RRU to be compensated.

其中,所述步骤a1中,在链型组网时,BBU可通过分段测量再进行运算处理的方式得到时间数据;在星型组网时,BBU可以直接测量得时间数据。 Mode wherein, in the step a1, when the chain networking, the BBU can be further processed by the arithmetic measured segment time data; when a star network, the BBU can be measured to obtain time data directly.

其中,步骤a3中,各个RRU的补偿值等于各自的下行时延与最大下行时延的差的绝对值。 Wherein, in step a3, the compensation value is equal to the absolute difference between the respective RRU respective downlink delay and the maximum downlink delay.

本发明具有如下有益效果:1)可以在同一个BBU所连接的两个RRU上实现发射分集的功能,无须在一个RRU上设置2套功放模块;2)利用软件自动实现了时延的测量与补偿,减少了硬件调试、校准的工作量;3)可以根据用户的需要任意配置两个RRU实现发射分集功能,可以灵活组成各种无线网络,也可以令两个处于发射分集模式下的RRU工作于不分集发射的模式下。 The present invention has the following advantages: 1) transmit diversity function can be achieved in two RRU is connected with a BBU, need not be provided in two sets on a power amplifier module RRU; 2) automatically by software and the delay measurement compensation, reducing the hardware debugging, the calibration effort; 3) can be arranged in any two RRU achieve transmit diversity function according to user's needs can be flexibly composed of various wireless networks, can also make the work of the two it is RRU transmit diversity mode regardless set at transmission mode.

附图说明 BRIEF DESCRIPTION

图1是BBU与两个RRU之间的星型组网方式示意图;图2是BBU与两个RRU之间的链型组网方式示意图;图3是BBU与两个RRU通过星型组网时的时延示意图;图4是BBU与两个RRU通过链型组网时的时延示意图;图5是BBU与两个RRU链型组网,中间存在另外一个RRU时的时延示意图;图6是本发明实现发射分集的方法流程图。 Figure 1 is a schematic view of a star networking between two BBU and RRU; FIG. 2 is a schematic view of chain networking between two BBU and RRU; FIG. 3 is a BBU and RRU via two star networking when delay schematic; FIG. 4 is a schematic view of the delay time of BBU and RRU via two chain networking; FIG. 5 is a BBU and RRU two chain networking, delay schematic view of another intermediate the presence RRU; FIG. 6 the method of the present invention is to achieve transmit diversity. FIG.

具体实施方式 Detailed ways

当一个小区支持发射分集时,BBU上就会发射两个下行的IQ通道数据至RRU,其中一个是主集的IQ通道数据,一个是分集的IQ通道数据,这两个IQ通道数据在BBU的输出口上是完全同步的。 When a cell support transmit diversity, the BBU will transmit two downlink IQ channel data to the RRU, which is a master set of IQ data channel, a data channel is IQ diversity, both in the BBU IQ channel data an output port is entirely synchronous.

BBU通过光纤传输到达RRU的信号,因为要经过不同长度的光纤、级联才能达到RRU,必然会造成不同的延时,而且RRU由于制造工艺、采用的实现技术不同,其下行通道的时延也不相同。 BBU RRU reach the optical fiber transmission signal, through the optical fiber due to the different length, in order to achieve RRU cascade, will inevitably result in different delays, due to the manufacturing process and the RRU, different implementations of the technology used, the downlink channel which is also the delay Not the same. 因此本发明在RRU上对下行的延时进行补偿,以达到两个RRU的天线口上的信号的时间差不超过一定时间长度的要求。 Thus, the present invention is the downlink delay compensation in the RRU, the time to achieve a signal on two antennas RRU port does not exceed a certain length of time required.

下面结合附图和具体实施例对本发明作进一步详细的描述:利用2个RRU实现发射分集功能,是指两个RRU分别发射主集天线的信号、分集天线的信号。 DRAWINGS Examples and embodiments of the present invention will be further described in detail: two RRU using the signal to achieve transmit diversity function, refers to two RRU respectively transmit antenna main signal, diversity antenna. RRU与BBU的组网方式有两种:(1)两个RRU通过星型组网的方式分别与BBU互联,RRU之间没有连线,如图1所示;(2)两个RRU与BBU通过链型的方式互联,相互之间直接相联,如图2所示。 RRU and the BBU networking, there are two: (1) by two star networking RRU and BBU interconnected manner, there is no difference between the RRU connection shown in Figure 1; (2) two BBU and the RRU interconnected by a chain-type manner, directly linked to each other, as shown in FIG.

图6所示为本发明利用两个远端射频单元实现发射分集的方法流程图,下面针对星型组网、链型组网的两种情况,说明本发明所述方法实现的步骤:601、在BBU与RRU建立连接之后,BBU进行BBU与RRU之间的各时间段的测量。 Figure 6 shows a flowchart of using two remote radio unit a transmit diversity method to achieve the present invention, the following two cases for the star network, a chain network, the present invention is explained step-implemented method of: 601, after establishing a connection with BBU RRU, BBU each time period measured between the BBU and the RRU.

其中,在星型组网的情况下,BBU可以直接测量得到;在链型组网的情况下,BBU可以通过分段测量再进行运算处理的方式得到。 Wherein, in the case of star networking, the BBU can be measured directly; in the case of chain networking, then the BBU can be measured by a segmented embodiment of the arithmetic processing.

602、BBU得到上报的测量数据后,计算出BBU至各个RRU的下行的时延值。 After 602, the measurement data obtained reported BBU calculate each BBU to the RRU downlink delay value.

如图3所示,在星型组网的情况下,RRU#1、RRU#2的下行时延分别为:TSTAR_DL1=T12(1)+T2a(1) (公式1)TSTAR_DL2=T12(2)+T2a(2) (公式2)其中,T12(1)表示RAN1的参考点1与2之间的时间差;T2a(1)表示RAN1的参考点2至天线口a之间的下行信号时间差;T12(2)表示RAN2的参考点1与2之间的时间差;T2a(2)表示RAN2的参考点2至天线口a之间的下行信号时间差。 3, in the case of star networking, RRU # 1, the downlink delay RRU # 2 were: TSTAR_DL1 = T12 (1) + T2a (1) (Equation 1) TSTAR_DL2 = T12 (2) + T2a (2) (equation 2) wherein, T12 (1) represents the time between 1 and 2 RAN1 reference point difference; T2 a (1) indicates a downlink signal time between RAN1 reference point 2 to the antenna port a difference; T12 (2) RAN2 time reference point difference between 1 and 2; T2 a (2) represents the time between the downlink signal RAN2 reference point to the antenna port 2 a difference.

在链型组网的情况下,RRU#1、RRU#2的下行时延分别为:TCHAIN_DL1=T12(1)+T2a(1) (公式3)TCHAIN_DL2=T12(1)+TBdelayDL(1)+T12(2)+T2a(2) (公式4)其中,T12(1)表示RAN1的参考点1与2之间的时间差;T2a(1)表示RAN1的参考点2至天线口a之间的下行信号时间差;T12(2)表示RAN2的参考点1与2之间的时间差;T2a(2)表示RAN2的参考点2至天线口a之间的下行信号时间差;TBdelayDL(1)表示RRU1的参考点2与3之间的时间差。 In the case of chain networking, RRU # 1, RRU # 2, respectively downlink delay: TCHAIN_DL1 = T12 (1) + T2a (1) (Equation 3) TCHAIN_DL2 = T12 (1) + TBdelayDL (1) + T12 (2) + T2a (2) (equation 4) wherein, T12 (1) represented RAN1 reference point 1 and the time difference between the two; T2 a (1) represents the downlink between the reference point RAN1 antenna port 2 to a signal time difference; T12 (2) represented RAN2 reference point of time between 1 and the second difference; T2 a (2) represents the downlink signal time between RAN2 reference point 2 to the antenna port a difference; TBdelayDL (1) represents the reference point RRU1 of a time difference between 2 and 3.

另外,在链型组网的情况下,还有可能出现在BBU与RRU#1、RRU#2之间有1个或多个RRU存在的情况,如图5所示。 Further, in the case of chain networking, may also appear in the BBU and RRU # 1, there is the presence of one or more RRU between RRU # 2, as shown in FIG. 此时可以参照公式(4)把T12(1)看成是BBU与RRU#1之间的下行时延之和。 At this time T12 can (1) as a downlink delay BBU and RRU # 1 and between reference to Equation (4).

603、BBU根据得到的各个RRU的下行时延数值计算各个RRU需要补偿的时间长度。 603, BBU RRU respective length of time needs to be compensated is calculated based on respective downlink delay values ​​obtained by the RRU.

在星型网情况下的补偿值为: Compensation value in the case of star network:

TSTAR_RRU1=0.......................TSTAR_DL1≥TSTAR_DL2TSTAR_DL2-TSTAR_DL1.....TSTAR_DL1<TSTAR_DL2]]>(公试5)TSTAR_RRU2=.TSTAR_DL1-TSTAR_DL2......TSTAR_DL1≥TSTAR_DL20.......................TSTAR_DL1<TSTAR_DL2]]>(公试6)在链型组网情况下,RRU#1、RRU#2的补偿值分别为:TCHAIN_RRU1=TCHAIN_DL2-TCHAIN_DL1(公式7)TCHAIN_RRU2=0 (公式8)604、BBU通过信令信道将需要补偿的时间参数配置给各个RRU。 TSTAR_RRU1 = 0 ....................... TSTAR_DL1 & GreaterEqual; TSTAR_DL2TSTAR_DL2-TSTAR_DL1 ..... TSTAR_DL1 & lt; TSTAR_DL2]]> (male test 5) TSTAR_RRU2 =. TSTAR_DL1-TSTAR_DL2 ...... TSTAR_DL1 & GreaterEqual; TSTAR_DL20 ....................... TSTAR_DL1 & lt; TSTAR_DL2]]> (sample well 6) in-chain group net case, RRU # 1, RRU # compensation value 2 are: TCHAIN_RRU1 = TCHAIN_DL2-TCHAIN_DL1 (equation 7) TCHAIN_RRU2 = 0 (equation 8) 604, BBU via the signaling channel will need to compensate for time parameters to each RRU .

605、RRU根据BBU配置的延时参数实现下行时延的补偿。 605, RRU achieve downlink delay compensation delay parameter BBU according to configuration.

以上所述仅为本发明的较佳实施例而已,并不用以限制本发明,凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等,均应包含在本发明的保护范围之内。 The above are only preferred embodiments of the present invention but are not intended to limit the present invention, any modifications within the spirit and principle of the present invention, equivalent replacements and improvements should fall in the protection of the present invention within range.

Claims (4)

1.一种利用两个远端射频单元实现发射分集的方法,其特征在于,包括以下步骤:a、基带单元BBU计算两个射频单元RRU需要补偿的时间长度;b、BBU将需要补偿的时间参数配置给各个RRU;c、RRU根据BBU配置的延时参数进行下行时延的补偿。 A remote radio unit using two methods to achieve transmit diversity, characterized by, comprising the steps of: a, length of time calculating unit BBU base band RF unit RRU two to be compensated; B, the need to compensate for time BBU parameters to each RRU; c, RRU downlink delay compensating delay parameter BBU according to configuration.
2.如权利要求1所述的利用两个远端射频单元实现发射分集的方法,其特征在于,所述步骤a进一步包括:a1、BBU测量其与两个RRU之间的各时间段;a2、根据上述测量数据,计算BBU至各个RRU的下行的时延值;a3、根据步骤b中所得的下行时延值,BBU计算各个RRU需要补偿的时间长度。 2. The use of two distal ends of the radio frequency unit of claim 1 implemented method of transmit diversity, wherein, said step a further comprises: a1, BBU time period between each measurement with two RRU; a2 , based on the measured data, calculates downlink delay value BBU to the RRU each; A3, according to the downlink delay values ​​obtained in step b, calculating the length of time of each BBU RRU to be compensated.
3.如权利要求2所述的利用两个远端射频单元实现发射分集的方法,其特征在于,所述步骤a1中,在链型组网时,BBU可通过分段测量再进行运算处理的方式得到时间数据;在星型组网时,BBU可以直接测量得时间数据。 3. The use according to claim 2 two remote radio unit implemented method transmit diversity, characterized in that said step a1, when the chain networking, then the BBU can be measured segment by arithmetic processing way to get the time data; when the star network, BBU can be measured to obtain time data directly.
4.如权利要求2所述的利用两个远端射频单元实现发射分集的方法,其特征在于,步骤a3中,各个RRU的补偿值等于各自的下行时延与最大下行时延的差的绝对值。 4. Absolute with two distal ends of the radio frequency unit of claim 2 implemented method of transmit diversity, characterized in that, in step a3, the compensation value for each RRU is equal to the difference of each of downlink delay and the maximum delay of downlink value.
CN 200710074075 2007-04-19 2007-04-19 Method for realizing transmitter diversity using two remote RF units CN101039134A (en)

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WO2009049511A1 (en) * 2007-10-16 2009-04-23 Shenzhen Grentech Co., Ltd Data transmission synchro precision controlling method and system
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CN102035611B (en) 2010-12-29 2014-03-12 武汉邮电科学研究院 Remote radio unit multi-antenna real-time calibration system and method
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