CN100518016C - Method for holding every antenna port downlink data synchronization of the same base station - Google Patents

Method for holding every antenna port downlink data synchronization of the same base station Download PDF

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CN100518016C
CN100518016C CN 200510077519 CN200510077519A CN100518016C CN 100518016 C CN100518016 C CN 100518016C CN 200510077519 CN200510077519 CN 200510077519 CN 200510077519 A CN200510077519 A CN 200510077519A CN 100518016 C CN100518016 C CN 100518016C
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re
downlink data
rec
timing
time
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CN 200510077519
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CN1881840A (en
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夏迎九
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上海华为技术有限公司
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Abstract

本发明公开了一种保持同一基站各天线口下行数据同步的方法,包括:RE根据接收到的CPRI帧,以及CPRI帧从REC定时参考点发送到RE定时恢复参考点经过的延迟时间,重建RE的BFN定时参考;REC在向RE发送的下行数据的同时指明该下行数据到达RE天线口的时刻;RE根据接收到的当前下行数据所指定的该下行数据到达RE天线口的时刻,基于自身重建的BFN定时参考,将该下行数据发送出去,使该数据到达天线口的时刻为所述指定时刻。 The present invention discloses a method of synchronizing the same base station downlink data holding each antenna port, comprising: RE according to the received CPRI frame, the CPRI frame and transmits the delay time from the REC to the RE timing reference point through the reference point of the timing recovery, reconstruction RE the BFN timing reference; the REC indicates that the downlink data arrival time RE antenna port at the same time transmitted to the RE downlink data; RE specified based on the current received downlink data to the downlink data arrival RE antenna interface timing, based on their reconstruction the BFN timing reference, the transmitted downlink data, so that the arrival time data for the antenna port designated time. 本发明方法保证了同一基站各小区在天线口的同步关系,避免了REC内部下行数据传送的延迟不确定性。 The method of the present invention ensures that the same base station of each cell in the synchronous relationship of the antenna aperture, avoiding a delay uncertainty REC internal downlink data transfer.

Description

一种保持同一基站各天线口下行数据同步的方法 A method of opening the same base station downlink synchronization holding data of each antenna

技术领域 FIELD

本发明涉及基站小区同步技术,特别是指一种在采用通用公共无线接口 The present invention relates to a base station cell synchronization technique, particularly to a common public radio interface employing

(CPRI)协议时,保持同一基站各天线口下行数据同步的方法。 When (the CPRI) protocol, to maintain the same method of synchronizing a base station antenna for each downlink data port. 背景技术 Background technique

在宽带码分多址(WCDMA)系统中,同一基站(NodeB)各小区的无线帧定时的延迟时间是256Tc的整数倍,Tc为一个码片(Chip)的周期。 Wideband code division multiple access (WCDMA) system, the same base station (the NodeB) radio frame timing delay time of each cell is an integer multiple of 256Tc, Tc is the period of one chip (Chip) a. 不同小区无线帧定时的不准确性将会影响手机搜索小区同步信道(SCH信道)及定位业务的性能。 Different cell radio frame timing inaccuracies will affect the performance of the phone searches for a cell synchronization channel (SCH channel) and the location service. 为了支持发射分集功能,要求一个小区内发射分集的两条支路的偏差要在一个很小的范围内,比如:WCDMA规定偏差范围在1/4Tc内,这对下行发射同步提出了更高的要求。 To support transmit diversity function within a cell requires two transmit offset diversity branches to be within a small range, such as: WCDMA within a predetermined deviation range 1 / 4Tc, which transmit the downlink synchronization of a higher Claim. 实际实现时发射分集的两条支路可能在两个RE上实现,这给下行发射同步的实现带来了更大的难度。 Two transmit diversity branches may be implemented in two RE on the actual implementation, this downlink transmission to achieve synchronization brings more difficult.

NodeB中有一个基准的基站帧定时,就是BFN定时。 NodeB has a reference base station frame timing, the BFN is a timing. 如果能保证各小区的BFN定时的同步关系,则通过固定的256Tc的整数倍延迟,就可以确保各小区的无线帧定时的同步关系。 If the relationship between BFN can guarantee the synchronization timing of each cell, through an integral multiple of a fixed delay 256Tc, can ensure that the radio frame timing of the synchronization relationship in each cell.

本申请人在先提出的一篇名称为《一种实现基站同步传输的方法》的专利申请中提出过一种实现基站同步传输的方法> 该方法在无线设备控制器(REC)和无线设备(RE)之间通过建立的定时参考环回检测通道来实时测量REC与RE各自BFN定时之间的时延量,将测量结果携带在REC发出下行数据中发送给RE, RE根据该时延量校正自身的BFN定时,从而保证REC The name of the present applicant proposed a previously proposed "Method to achieve synchronous transmission of a base station" in the patent application over the base-station synchronization method for implementing transmission> in which radio equipment control (REC) and a wireless device ( between RE) through a timing reference established loopback channels to measure in real time the amount of delay between the REC and the RE are each BFN timing of the measurement results sent to the RE carries the downlink data sent in the REC, according to the delay correction amount RE BFN timing of its own, to ensure REC

与其所带的RE之间实时保持同步。 Real-time synchronization between keeping its carried RE.

该方案要求必须在REC和RE之间建立专门的定时参考环回检测通道, 然而CPRI协议并没有在REC与RE之间定义类似的环回通道,且实际中REC与RE之间相距可能很远,往往是通过光纤进行连接,不允许有单独的环回检测通道,因此在这种情况下,上述方案无法应用。 This solution requires special timing reference must be established loopback detection channel between the REC and the RE, but does not define the CPRI protocol similar loopback path between REC and RE, and the actual distance between the REC and the RE may be miles away often connected by an optical fiber, it does not allow separate loopback channel, so in this case, the above solution can not be applied.

发明内容. SUMMARY.

有鉴于此,本发明的主要目的在于提供一种保持同一基站各天线口下行数据同步的方法,利用现有的基站系统实现基站的各小区在天线口保持确定的同步关系,避免REC内部下行数据传送的延迟不确定性。 In view of this, the main object of the present invention to provide a method of the same base station downlink ports each antenna to maintain data synchronization, the base station using the existing system to achieve each cell base station to maintain the synchronization relationship in determining the antenna port, to avoid internal REC downlink data transmission delay uncertainty.

基于上述目的本发明提供的保持同一基站各天线口下行数据同步的方法,包括: The method of holding the same base station downlink ports each antenna synchronizing the data object based on the present invention provides, comprising:

a) 无线设备RE根据接收到的通用公共无线接口CPRI帧,以及CPRI 帧从无线设备控制器REC定时参考点发送到RE定时恢复参考点经过的延迟时间,重建RE的基站NodeB的帧号BFN定时参考; a) the wireless device RE according to the CPRI Common Public Radio Interface frame is received, and a delay time from the wireless device transmits the CPRI frame timing reference point controller REC to RE timing recovery through the reference point, the base station NodeB RE reconstructed frame number BFN timing of reference;

b) REC在向RE发送下行数据的同时指定该下行数据到达RE天线口的时刻; b) REC specifies downlink data while transmitting the downlink data to the RE RE arrival time of the antenna port;

c) RE根据接收到的为该下行数据所指定的该下行数据到达RE天线口 C) RE RE reaches the antenna port according to the received downlink data for the downlink data designated

的时刻,基于自身重建的BFN定时参考,将该下行数据发送出去,使该下 Time, based on its own timing reference BFN reconstruction, the transmitted downlink data out, so that the lower

行数据到达天线口的时刻为所述REC指定的时刻。 Line data arrival time of the time specified for the antenna port of the REC.

该方法步骤a所述重建RE的BFN定时参考的方法为:RE将收到的CPRI The reconstruction method of the RE in step a BFN timing reference method: CPRI RE will receive

帧中的BFN定时提前所述CPRI帧从REC定时参考点发送到RE定时恢复 BFN frame timing advance of the timing of the CPRI frame sent from the REC to the RE timing recovery reference point

参考点经过的时间延迟后作为本地的BFN定时; After a time delay after the reference point as a local timing of BFN;

步骤c所述RE发送下行数据的方法为:RE基于自身重建的BFN定时参考,将所述下行数据发送出去,使该下行数据通过定时恢复参考点处的时刻比指定的该下行数据到达RE天线口的时刻提前该下行数据从该定时恢复参考点到天线口所需的延迟时间。 The method of step c RE transmits downlink data is: RE BFN timing reference based on the reconstruction itself, and transmits the downlink data out, so that the data reaches the RE downlink antenna than the downlink data specified by the timing recovery at the time point of the reference advancing the opening timing recovery data from the downlink timing reference point to the desired time delay antenna port.

该方法步骤a所述重建RE的BFN定时参考的方法为:RE将收到的CPRI 帧中的BFN定时提前所述CPRI帧从REC定时参考点发送到RE定时恢复参考点经过的延迟时间,以及下行数据从该定时恢复参考点到RE天线口所需的延迟时间后作为本地的BFN定时;.步骤c所述RE发送下行数据的方法为:RE基于自身重建的BFN定时参考,将所述下行数据发送出去,使该下行数据通过定时恢复参考点处的时刻为指定的该下行数据到达RE天线口的时刻。 The method steps of the method of rebuilding a BFN timing reference for the RE: RE in a CPRI frame received by the BFN timing advance of the timing of the CPRI frame is transmitted from the reference point to the REC timing recovery RE delay time after the reference point, and the downstream data recovered from the timing reference point to the antenna port after the desired delay time as the RE local timing of BFN; method step c RE transmits the downlink data for: RE BFN timing reference based on their reconstruction, the downlink data sent, so that the RE downlink data arrival time of the antenna port of the downlink data specified by the timing recovery at the time of the reference point.

该方法所述CPRI帧从REC定时参考点发送到RE定时恢复参考点经过的延迟时间为:从REC定时参考点到REC下行输出点的延迟、从REC下行输出点到目的RE下行输入点的延迟、以及从该RE下行输入点到RE定时恢复参考点的延迟之和。 The method of transmitting the CPRI frame timing reference point from the REC to the RE timing recovery delay time after the reference point is: from the REC timing reference point to the output point of the delay REC downlink, the downlink from the REC output point to the destination point input RE downlink delay , and a delay of the timing recovery from the reference point to the input point RE RE and downlink.

该方法步骤b所述REC发送下行数据的同时指定该下行数据到达RE 天线口时刻的方法为:REC将所述下行数据放置在预期的该下行数据到达RE天线口的时刻所对应的CPRI帧的位置,将CPRI帧发送出去; Meanwhile, the method of process step b specify the downlink data transmission to the REC downlink data arrival time of antenna interface RE: REC downlink data is placed in the CPRI frame timing of the downlink data arrives at the expected RE antenna port corresponding to the position of the CPRI frame sent;

则步骤c中所述RE根据下行数据在CPRI帧中的位置获知REC指定的该下行数据到达RE天线口的时刻。 The step (c) the designated REC known RE downlink data arrival time of the RE position according to the antenna port of the downlink data in the CPRI frame.

该方法进一步包括:在初始化或配置发生变化时,REC将下行CPRI帧中承载的数据相对于CPRI帧序列的偏移量通过高层维护通道通知RE; The method further comprising: upon initialization or configuration changes, REC CPRI downlink data frame carried in the CPRI frame with respect to the offset sequences by high maintenance channel notification REs;

步骤c中RE根据下行数据在CPRI帧中的位置以及所述偏移量获知REC指定的该下行数据到达RE天线口的时刻。 Step c RE downlink data according to the position of the CPRI frame offset and the known REC specifies downlink data arrival time RE antenna port.

该方法步骤b所述REC发送下行数据的同时指定该下行数据到达RE 天线口时刻的方法为:REC在向目的RE发送的下行数据中加上用于指明该下行数据到达RE天线口的时刻的时间标签; Meanwhile, the method of process step b specify the downlink data transmission to the REC downlink data arrival time of antenna interface RE: REC RE transmits downlink data to the destination specified in the downlink data plus the arrival time of the antenna interface RE time stamp;

步骤c中RE根据下行数据的时间标签获知REC指定的该下行数据到达RE天线口的时刻。 Step c RE known REC specifies the RE downlink data arrival time based on the time tag antenna interface downlink data.

从上面所述可以看出,本发明提供的保持同一基站各天线口下行数据同步的方法,利用CPRI帧的传输特性实现RE侧BFN定时参考的重建,并通过指定下行数据到达目的RE天线口时间的方式,使发送的下行数据到达各天线口的时间保持同步,从而保证了同一基站各小区在天线口的同步关系, 避免了REC内部下行数据传送的延迟不确定性。 As can be seen from the above, the present invention provides a method for retaining the same base station downlink ports each antenna data synchronization, the transmission characteristics of the CPRI frame by using the RE-side implementation of the reconstruction BFN timing reference and object RE antenna port by specifying the downlink data arrival time manner, so that the transmission time of downlink data arrives at each antenna port synchronized, thus ensuring the same base station of each cell in the synchronous relationship of the antenna aperture, avoiding a delay uncertainty REC internal downlink data transfer. 附图说明 BRIEF DESCRIPTION

图1为下行方向数据从REC的定时参考点到RE侧天线口传输过程的各段延迟时间量示意图; FIG 1 is a downstream direction from the timing of the reference data point RE to the REC-side antenna port transmission delay time amount of each segment a schematic view;

图2为REC与RE之间延迟测量示意图; FIG 2 is a diagram illustrating measurement of the delay between the REC and REs;

图3为REC与RE之间延迟测量中延迟时间量的示意图; FIG 3 is a schematic diagram of a delay amount measured time delay between the REC and REs;

图4为本发明较佳实施例的流程示意图。 FIG 4 is a schematic flow diagram of the preferred embodiment of the invention.

具体实施方式 Detailed ways

下面结合附图及具体实施例对本发明再作进一步详细的说明。 Specific embodiments of the present disclosure will be described in further detail below in conjunction with the accompanying drawings and. 考虑到在采用CPRI协议的基站系统内部,REC与RE之间的数据交互是通过持续不断的CPRI帧互发实现的,因而本发明的思路是:首先利用REC向RE发送的CPRI帧重建二者之间同步的定时参考,然后再以该同步的定时参考为基准,通过REC在向RE发送的下行数据时指定该下行数据到达RE天线口时刻的方式,使得REC发出的下行数据在到达RE天线口时保持同步。 Considering the CPRI protocol employed within the base station system, data exchange between the REC and the RE is continuous through the cross hair to achieve the CPRI frame, so the idea of ​​the present invention are: Firstly, both the REC transmits the CPRI frame to the reconstructed RE between the reference timing synchronized, then synchronization to the timing reference as a reference, the REC specifies downlink data when the downlink data transmitted to the antenna port rE rE arrival time by the way, that the downlink data arrival sent REC rE antenna in sync port.

根据CPRI协议,基站内部REC与RE之间交互的CPRI帧的控制字段中包括有NodeB的帧号(BFN)和CPRI的超帧号(HFN ), —个BFN的帧周期为10毫秒(ms),每个BFN中包含150个HFN,每个HFN中有256个基本帧。 The CPRI frame control field of the CPRI protocol interaction between the internal base of the REC and RE comprises a frame number (BFN) of the NodeB and CPRI hyper frame number (HFN), - a BFN frame period of 10 milliseconds (ms) each HFN BFN 150 contains, in each HFN 256 basic frames. BFN和HFN的具体数值是都基于基站设置在REC侧统一的定时参考而确定的。 Specific numerical values ​​are BFN and HFN is determined based on the timing reference base station provided uniform REC side.

参见图1所示,数据从REC侧的定时参考点发送到RE侧的定时恢复参考点的过程中,所经过的时间延迟包括:从REC定时参考点到REC下行输出点的延迟Tl,从REC下行输出点到目的RE下行输入点的延迟T12,以及从RE下行输入点到RE定时恢复参考点的延迟T2。 Referring to FIG procedure, the data transmitted from the timing reference point to the REC side, a side of the timing recovery RE reference point, the elapsed time delay comprises: a timing reference point from the REC to the downlink delay Tl REC output points, from the REC downlink output point to the destination point input RE downlink delay T12, and a timing recovery from the reference point to the input point RE RE downlink delay T2.

其中,Tl和T2是基站建立时就已确定的已知量;延迟T12根据CPRI协议是可以通过测量获得的。 Wherein, Tl, and T2 are known quantities already determined when the base station establishes; The T12 delaying the CPRI protocol is obtained by the measurement. T12的具体获取过程参见图2所示,从REC的下行输出点Rl发出的CPRI帧经时延T12到达RE下行输入点R2,在RE中经Toffset的时延后从RE的上行输出点R3发出经时延T34到达REC的上行输入点R4。 Referring specifically T12 acquisition process shown in FIG. 2, CPRI frame is sent from the downlink delay T12 Rl REC output point reaches the input point RE downlink R2, emitted from the delayed uplink R3 RE output point when the RE through the Toffset by an uplink delay T34 reaches the input point of REC R4. 这一过程,REC与RE之间CPRI帧的延迟时间量可参见图3所示。 This process, the amount of delay between the REC and the RE time CPRI frame may refer to FIG. 3. 其中,延迟Toffset是RE在处理数据时上下行数据帧的延迟,其延迟量是在设计时就已确定好的固定值。 Wherein a delay Toffset RE uplink and downlink data frame delay when processing the data, the delay amount which is a fixed value already-determined at design time. T14是REC测量的上述R1—〉R2—>R3—>R4整个环回过程的总延迟。 T14 is the total delay above R1-> R2-> R3-> R4 entire process loop REC measured. 另外, 一般来说T12-T34,从而得到T12 = T34 = ( T14 - Toffset) /2。 Further, in general T12-T34, whereby T12 = T34 = (T14 - Toffset) / 2.

仍参见图1所示,Tl是从REC的定时参考点到REC下行输出点的延迟。 Still referring to FIG. 1, Tl is the reference point from the timing delay to the REC REC descending output point. 从定时关系上来说,是从REC的BFN 10毫秒无线帧起始时刻到REC下行输出点处BFN= 0, HFN = 0的CPRI帧起始时刻之间的延迟。 From the timing relationship, it is from the REC BFN 10 ms radio frame starting time to the output point of the REC downlink BFN ​​= 0, HFN = delay between the start time 0 of the CPRI frame.

T2是从RE输入点到定时恢复参考点出的延迟。 T2 is the timing recovery delay from the reference point to the input point RE.

本发明保持同一基站各天线口下行数据同步方法的具体实现过程包括:步骤40, RE根据CPRI帧的定时信息以及Tl、 T12和T2重建RE的 The present invention maintains the same specific implementation process of each base station antenna interface downlink data synchronization method comprising: a step 40, RE RE reconstruction based on the timing information of a CPRI frame, and Tl, T12 and T2

BFN定时参考,使得RE侧定时恢复参考点与REC的定时参考点保持时钟同步。 BFN timing reference, so that the RE-side timing recovery clock synchronization with the reference point remains the timing reference point of the REC.

具体包括:将收到的CPRI帧中的BFN定时提前Tl+T12+T2作为本地的BFN定时。 Comprises: CPRI frames received by the BFN timing advance Tl + T12 + T2 as the timing of the local BFN. 比如:将在RE的定时恢复参考点处收到BFN= 0, HFN = 0的CPRI第一帧的时刻减去T1+T12+T2作为本地BFN: 0, HFN = 0的CPRI帧初始时刻。 For example: the recovery point at the reference timing of receipt of BFN = 0 in the RE, HFN = CPRI 0 of the first frame time T1 + T12 + T2 by subtracting a local BFN: 0, HFN = CPRI frame 0 of the initial time. 如果没有获取到BFN = 0, HFN = 0的CPRI笫一帧的时刻,则也可以通过所获取的其它帧计算,比如:当前获取的为BFN=1, HFN-3的CPRI第一帧的时刻,则将收到该帧的时刻减去T1+T12+T2作为本地BFN=1, HFN = 3的CPRI第一帧的时刻。 Unless it acquires the BFN = 0, HFN = CPRI Zi of a time 0, the calculation may be acquired by another frame, such as: acquisition of current BFN = 1, the timing of the first frame of the CPRI HFN-3 , then the received frame by subtracting the time T1 + T12 + T2 as a local BFN = 1, HFN = CPRI time 3 of the first frame.

这里,如果不考虑T1、 T12和T2本身的误差,RE重建的BFN定时参考与REC中的BFN定时参考是同步的。 Here, without considering the timing reference BFN REC T1, T12 and T2 itself error, RE reconstructed BFN timing reference synchronized.

步骤41, REC在向目的RE发送的下行数据的同时指明该下行数据到达RE天线口的时刻。 Step 41, REC indicates that the downlink data arrival time RE RE antenna port while the downlink data transmitted to the destination.

由于根据CPRI协议,数据在CPRI帧中的位置与其发送时间具有一一对应关系,因此本步骤最筒单的实现方案为:REC将所述下行数据放置在CPRI帧的特定位置发送出去,这样RE就可以根据下行数据在CPRI帧的位置获知该下行数据应到达RE天线口的时刻。 Since the CPRI protocol, the data position in the CPRI frame has a transmission time of one relationship therewith, so this step most of the implementation of a single cylinder: REC downlink data is placed in the specific position of the CPRI frame sent, so RE It can be informed of the downlink data arrival time at the position of RE antenna interface CPRI frame according to the downlink data.

这一过程REC可以将下行CPRI帧中承载的数据相对于CPRI帧序列的偏移量通过高层维护通道告知RE。 This process REC downlink data may be carried in the CPRI frame with respect to the offset of the CPRI frame through the RE sequence level to inform maintenance channel.

由于CPRI帧传送过程中,对于特定的RE,其收到的CPRI帧的BFN和HFN号是连续的,CPRI帧承载的数据也是连续的,而且两者之间的关联关系一般不会改变,因此,对于特定的RE,只要REC在初始化或配置发生变化时将所发生的偏移量通过高层维护通道通知RE, RE就可以根据下行数据在CPRI帧中的位置以及所述偏移量确定接收数据的指定到达天线口的时刻。 Since the CPRI frame transmission process, for a particular RE, BFN and HFN number received CPRI frame which is continuous, the data carried by the CPRI frame is continuous, and the relationship between the two general do not change, , for a particular RE, whenever a change occurs in the REC initialization or configuration of the offset occurring high maintenance channel notified by the RE, the RE can position the CPRI frame offset and the received data is determined according to the downlink data specifies the time to reach the antenna port.

下行CPRI帧中承载的数据相对于下行CPRI帧序列的偏移量规定如下:BFN=0、 HFN-O下行CPRI帧的第一个基本帧所承载的数据,如果要在基准定时参考初始时刻到来时立即在某参考点,如天线口发送,则定义偏移量为0。 Data carried in the downlink CPRI frame with respect to downlink CPRI frame offset of a predetermined sequence follows: BFN = 0, HFN-O downlink CPRI basic frame the first data frame is carried, if an initial reference to a timing reference arrival time when now, as a transmitting antenna interface reference point defines the offset to zero. 这样,假设REC希望某下行数据在相对于RE侧定时参考0时刻从天线口发出,则REC可将该下行数据放在BFN = 0、 HFN = 0下行CPRI帧的第一个基本帧中。 Thus, assuming a REC desired downlink data with respect to the RE-side timing reference time sent from the antenna port 0, the downlink data in the REC may BFN = 0, HFN = 0 first downlink CPRI basic frame a frame.

BFN-O、 HFN-O下行CPRI帧的第一个基本帧所承载的数据,如果要在相对于基准定时参考时刻偏差n个码片(chip)的时刻在某参考点,如天线口发送,则定义偏移量为n。 BFN-O, HFN-O downlink CPRI basic frame the first data frame is carried, if so, transmit antenna port in a reference point in time with respect to the reference timing of the reference timing deviation n chips (Chip) of defines an offset to n. 这样,假设REC希望某下行数据在相对于RE侧定时参考第n个chip的时刻从天线口发出,则REC可将该下行数据放在BFN-0、 HFN-O下行CPRI帧的第一个基本帧中;同理,若REC希望下行数据在相对于RE侧定时参考第0时刻从天线口发出,则REC可将该下行数据放在BFN = 0、 HFN = 0下行CPRI帧的第一个基本帧之前n个chip的位置中。 Thus, assuming a desired REC downlink data sent in the RE side with respect to the n-th chip timing reference timing from the antenna port, the REC may be in the downlink data BFN-0, HFN-O downlink CPRI basic frame the first frame; Similarly, if the desired downlink data REC RE side with respect to the timing of the reference time sent from the antenna port 0, the downlink data in the REC may BFN = 0, HFN = 0 a first downlink CPRI basic frames before the frame position of the n chip.

当然上述只是一个较佳实施例,也可以在向目的RE发送的下行数据中加上一个特定的时间标签来指明该下行数据到达RE天线口的时刻。 Of course, the above-described embodiment is only a preferred embodiment, may be combined with a specific time stamp in the downlink data transmitted to the object to indicate that the RE downlink data arrival time RE antenna port.

步骤42, RE根据重建的BFN定时参考以及当前下行数据指定的到达 Step 42, RE reaches the specified reconstructed according BFN timing reference data and the current downlink

9天线口的时刻,将当前下行数据发送出去,使其到达天线口的时刻为所述指定时刻。 Time antenna port 9, downlink data is sent to the current, so that the time to reach the antenna port of the designated time.

参见图l所示,T3是数据从RE定时恢复参考点到RE下行输出点的延迟,T4是从RE下行输出点到天线口的延迟,T3和T4的值是在RE设计时就已经确定下来的已知量。 Referring to Figure l shows, T3 timing recovery data from the reference point to the RE downlink delay RE output point, T4 is downstream from the RE output point to the antenna port of the delay, T3 and T4 values ​​of RE are designed already been determined the known quantity. 这样,RE可以基于当前重建的BFN定时参考将当前下行数据发出,使该数据通过恢复参考点的时刻比REC指定的该数据出现在天线口的时刻提前T3 + T4的时间,从而数据到达天线口的时刻为REC指定的时刻。 Thus, RE may be a timing reference current downlink data transmitted based BFN current reconstructed, so that data in the data timing recovery reference point specified ratio REC appear whenever the antenna port T3 + T4 ahead of time, so that the data arrive at the antenna port the time for REC specified time.

以发送BFN-0、 HFN=0的第一个基本帧所承载的数据为例:如果预先规定的偏移量为0,则RE在恢复参考点处比0时刻提前T3 + T4时间将BFN=0, HFN=0的第一个基本帧的下行数据发出;如果预先规定的偏移量为n,则RE在恢复参考点处比第n个chip时刻提前T3 + T4时间将BFN=0,HFN=0的第一个基本帧的下行数据发出。 To transmit BFN-0, HFN = 0 of a data base frame carried by an example: If a predetermined offset is 0, then the RE recovery time at the reference point 2-0 will be ahead of time T3 + T4 BFN = 0, HFN = 0 a first downlink data frame substantially emitted; if a predetermined shift amount is n, the RE recovery ratio at the reference point in time before the n-th chip T3 + T4 time BFN = 0, HFN a first downlink data frame = 0 substantially emitted. 对于CPRI帧其它位置承载的数据的发送过程可以此类推。 For other locations CPRI frame data transmission process may be carried so.

通过上述步骤,就实现了不同小区和同一小区内不同RE上的发射通道间的下行数据的同步。 Through the above steps, to achieve synchronization between different cells and transmit on different channels within the same cell RE downlink data.

另外,本发明的实现方案并不限于上面所举的一例,比如:在所述步骤40中,RE侧重建的BFN定时参考不一定与REC侧定时参考保持一致,可以提前或错后一段固定时间,只要这段固定的时间是RE已知的即可。 Further, implementations of the present invention is not limited to one case cited above, for example: in the step 40, RE focusing built BFN timing reference and is not necessarily consistent with the timing reference REC side, after a fixed period of time may be ahead or as long as the fixed period of time is known to RE. 一个较佳的实施方式是RE侧在重建定时参考时,先将所述T3和T4考虑进去。 A preferred embodiment RE is the timing reference in the reconstruction side, the first T3 and T4 into account.

具体执行时步骤40包括:在RE侧将收到的CPRI帧中的BFN定时提前T1+T12+T2+(T3+T4)作为本地的BFN定时。 Specifically step 40 comprising: CPRI frames received by the RE side of the BFN timing advance T1 + T12 + T2 + (T3 + T4) as the timing of the local BFN. 例如:将在RE的定时恢复参考点处收到BFN = 0 , HFN = 0的CPRI第一帧的时刻减去T1+T12+T2+(T3+T4)作为本地BFN = 0, HFN = 0的CPRI帧初始时刻。 For example: A reference point at the timing recovery RE received BFN = 0, HFN = CPRI 0 by subtracting the first frame timing T1 + T12 + T2 + (T3 + T4) as a local BFN = 0, HFN = CPRI 0 of The initial time frame.

在步骤42中RE可以基于当前重建的BFN定时参考控制下行数据的发送,使其到达定时恢复参考点处的时刻相对于RE侧BFN定时参考为REC In step 42 is the RE downlink data transmission can be controlled based on the reconstructed current BFN timing reference, it gets to the timing recovery at the time point relative to the reference side BFN timing reference RE to REC

所指定时刻,而无需预留出恢复参考点到天线口的延迟时间T3+T4,如此,当下行数据到达天线口时,其相对于REC侧定时参考来说恰好是REC的指 Specified time, without the need to set aside time to restore the reference point to the antenna port of the delay T3 + T4, so, when downlink data arrive at the antenna port, for which REC side with respect to a timing reference means exactly REC

定时刻。 Given moment.

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、改进等,均应包含在本发明的保护范围之内。 The preferred embodiment of the above embodiments of the present invention only but are not intended to limit the present invention, any modifications within the spirit and principle of the present invention, the, equivalent replacement, or improvement, it should be included in the present invention. within the scope of protection.

Claims (7)

1、一种保持同一基站各天线口下行数据同步的方法,其特征在于,包括: a)无线设备RE根据接收到的通用公共无线接口CPRI帧,以及CPRI帧从无线设备控制器REC定时参考点发送到RE定时恢复参考点经过的延迟时间,重建RE的基站NodeB的帧号BFN定时参考; b)REC在向RE发送下行数据的同时指定该下行数据到达RE天线口的时刻; c)RE根据接收到的为该下行数据所指定的该下行数据到达RE天线口的时刻,基于自身重建的BFN定时参考,将该下行数据发送出去,使该下行数据到达天线口的时刻为所述REC指定的时刻。 1. A method for synchronizing downlink data port of each antenna remains the same base station, characterized by comprising: a) a wireless device RE according to the CPRI Common Public Radio Interface frame is received, from the wireless device and the CPRI frame timing reference point controller REC transmitted to the RE timing recovery delay time of the reference point after the reconstruction base station NodeB RE frame number BFN timing reference; b) REC specifies downlink data arrival time RE antenna port while transmitting downlink data to the RE; C) RE according for the received downlink data specified by the RE downlink data arrival time of the antenna interface, based on its own BFN reconstructed timing reference, transmits the downlink data out, so that the downlink data arrival time of the antenna interface is designated as the REC time.
2、 根据权利要求1所述的方法,其特征在于,步骤a)淅述重建RE的BFN定时参考的方法为:RE将收到的CPRI帧中的BFN定时提前所述CPRI帧从REC定时参考点发送到RE定时恢复参考点经过的时间延迟后作为本地的BFN定时; 、步骤O所述RE发送下行数据的方法为:RE基于自身重建的BFN定时参考,将所述下行数据发送出去,使该下行数据通过定时恢复参考点处的时刻比指定的该下行数据到达RE天线口的时刻提前该下行数据从该定时恢复参考点到天线口所需的延迟时间。 2. The method according to claim 1, wherein the step a) of said reconstructed RE Hsi BFN timing reference method: RE receives the CPRI frame in CPRI BFN timing advance of the timing reference frames from the REC RE transmission timing recovery point to the reference point of time elapsed after a timing delay of a local BFN;, step O RE transmits the downlink data for: RE BFN timing reference based on the reconstruction itself, and transmits the downlink data out, so that RE arrival time of the downlink data through the antenna aperture at the reference point of the timing recovery time than advance the downlink data specified by the data recovery from the downlink timing reference point to the desired time delay antenna port.
3、 根据权利要求1所述的方法,其特征在于,步骤a,述重建RE的BFN 定时参考的方法为:RE将收到的CPRI帧中的BFN定时提前所述CPRI帧从REC定时参考点发送到RE定时恢复参考点经过的延迟时间,以及下行数据从该定时恢复参考点到RE天线口所需的延迟时间后作为本地的BF'N定时;步骤c,)所述RE发送下行数据的方法为:RE基于自身重建的BFN定时参考,将所述下行数据发送出去,使该下行数据通过定时恢复参考点处的时刻为指定的该下行数据到达RE天线口的时刻。 3. The method according to claim 1, wherein the step a, the method BFN timing reference RE, said reconstruction: RE receives the CPRI frame in CPRI frame BFN timing advance of the timing reference point from the REC RE is sent to a timing recovery delay time after the reference point, and downlink data recovered from the timing reference point to RE delay time required for the antenna aperture as the timing of the local BF'N; step C,) of the RE downlink data transmission method: RE reconstructed based on its own BFN timing reference, the transmitted downlink data, the downlink data arrival time so that the antenna interface RE downlink data for the time specified by the timing recovery at the reference point.
4、 根据权利要求1或2或3所述的方法,其特征在于,所述CPRI帧从REC定时参考点发送到RE定时恢复参考点经过的延迟时间为:从REC定时参考点到REC下行输出点的延迟、从REC下行输出点到目的RE下行输入点的延迟、以及从该RE下行输入点到RE定时恢复参考点的延迟之和。 4. The method according to claim 1 or claim 23, wherein said transmission frame from the CPRI REC timing reference point to the timing recovery RE delay time after the reference point is: from the REC timing reference point to the descending output REC delay point, the downlink from the REC output point to the destination point input RE downlink delay, and the delay of the timing recovery from the reference point to the input point RE RE and downlink.
5、 根据权利要求1所述的方法,其特征在于,步骤b)辟述REC发送下行数据的同时指定该下行数据到达RE天线口时刻的方法为:REC将所述下行数据i文置在预期的该下行数据到达RE天线口的时刻所对应的CPRI帧的位置,将CPRI帧发送出去;则步骤c)中所述RE根据下行数据在CPRI帧中的位置获知REC指定的该下行数据到达RE天线口的时刻。 5. The method of claim 1, wherein step b) simultaneous provision of said REC specifies downlink data transmission method of the downlink data arrival time of antenna interface RE: REC the downlink data packets is set in anticipation i the downlink data arrival position of the CPRI frame timing of the RE corresponding to the antenna port, the CPRI frame will be sent out; the step c) the known REC RE downlink data according to the specified position in the downlink data frame reaches the CPRI RE time antenna port.
6、 根据权利要求5所述的方法,其特征在于,该方法进一步包括:在初始化或配置发生变化时,REC将下行CPRI帧中承载的数据相对于CPRJ帧序列的偏移量通过高层维护通道通知RE;步骤c,)中RE根据下行数据在CPRI帧中的位置以及所述偏移量获知REC指定的该下行数据到达RE天线口的时刻。 6. The method according to claim 5, characterized in that, the method further comprising: upon initialization or configuration changes, the REC downlink data carried in the CPRI frame offset relative to the sequence of frames CPRJ by high maintenance channel RE notification; step c,) of the RE in a CPRI frame position and the known offset REC specifies downlink data arrival time of the RE downlink data according to the antenna port.
7、 根据权利要求1所述的方法,其特征在于,步骤b)所述REC发送下行数据的同时指定该下行数据到达RE天线口时刻的方法为:REC在向目的RE发送的下行数据中加上用于指明该下行数据到达RE天线口的时刻的时间标签;步骤c)中RE根据下行数据的时间标签获知REC指定的该下行数据到达RE天线口的时刻。 7. The method of claim 1, wherein, while step b) transmitting downlink data REC specifying the downlink data arrival timing method as antenna interface RE: REC applied to downlink data transmitted to the RE object data for indicating the arrival time of the downlink RE timing tag antenna port; step c), the RE known REC specified RE downlink data arrival time based on the time tag antenna interface downlink data.
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