CN1881840A - 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 PDFInfo
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- CN1881840A CN1881840A CN 200510077519 CN200510077519A CN1881840A CN 1881840 A CN1881840 A CN 1881840A CN 200510077519 CN200510077519 CN 200510077519 CN 200510077519 A CN200510077519 A CN 200510077519A CN 1881840 A CN1881840 A CN 1881840A
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Abstract
The invention relates to a method for keeping the descending data synchronous of each antenna port in one base station, which comprises: RE, based received CPRI frame and the delay time that sending CPRI frame from the REC timed reference point to the RE timed return reference point, builds the BFN timed reference of RE; REC builds the time that said descending data reaches the RE antenna port when sending descending data to RE; RE, based on said time, and the rebuilt BRF timed reference, sends out the descending data, to make the time that the data reaches antenna port as the appointed time. The invention can confirm the synchronization between the antenna ports of each region of one base station, to avoid the descending data transmission delay inside REC.
Description
Technical field
The present invention relates to the base station cell simultaneous techniques, be meant a kind ofly when adopting common public radio interface (CPRI) agreement especially, keep the method for each antenna port downlink data sync of same base station.
Background technology
In Wideband Code Division Multiple Access (WCDMA) (WCDMA) system, be the integral multiple of 256Tc the time of delay of the radio frames of each sub-district, same base station (NodeB) timing, and Tc is the cycle of a chip (Chip).Different districts radio frames inaccuracy regularly will influence the performance of mobile phone searching sub-district synchronizing channel (SCH channel) and positioning service.In order to support the transmit diversity function, require the deviation of two branch roads of transmit diversity in the sub-district will be in a very little scope, such as: WCDMA regulation deviation range is in 1/4Tc, and this has higher requirement synchronously to downlink.Two branch roads of transmit diversity may be realized on two RE during actual the realization, and this has brought bigger difficulty for the synchronous realization of downlink.
The base station frame timing of a benchmark is arranged among the NodeB, is exactly the BFN timing.If can guarantee the BFN synchronized relation regularly of each sub-district, then the integral multiple by fixing 256Tc postpones, and just can guarantee the radio frames synchronized relation regularly of each sub-district.
One piece of name that the applicant formerly proposes is called in the patent application of " a kind of method that realizes base station synchronization transmission " and proposed a kind of method that realizes the base station synchronization transmission, this method is being come real-time measure R EC and the RE delay volume between the BFN timing separately by the timing reference loopback detection passage of setting up between radio equipment controller (REC) and the wireless device (RE), measurement result is carried at REC to be sent and sends to RE in the downlink data, the BFN that RE proofreaies and correct self according to this delay volume regularly, thereby guarantee REC with its with RE between keep synchronous in real time.
This scheme requires to set up special timing reference loopback detection passage between REC and RE, yet the CPRI agreement is the similar loopback passage of definition between REC and RE not, and it is far between REC and the RE in the reality at a distance of possibility, connect by optical fiber often, do not allow independent loopback detection passage, therefore in this case, such scheme can't be used.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method that keeps each antenna port downlink data sync of same base station, utilize existing base station system to realize that each sub-district of base station keeps definite synchronized relation in antenna opening, the delay uncertainty of avoiding the inner downlink data of REC to transmit.
Method based on each antenna port downlink data sync of the same base station of above-mentioned purpose maintenance provided by the invention comprises:
A) RE is according to the CPRI frame that receives, and the CPRI frame sends to the time of delay that RE regularly recovers the reference point process from REC timing reference point, rebuilds the BFN timing reference of RE;
B) REC is specifying this downlink data to arrive the moment of RE antenna opening when RE sends downlink data;
C) RE is according to the moment of specified this downlink data arrival RE antenna opening of the current downlink data that receives, and the BFN timing reference based on self rebuilding sends this downlink data, and the moment that makes these data arrive antenna opening is the described appointment moment.
The method of the BFN timing reference of the described reconstruction of this method step a RE is: RE sends to RE with the described CPRI frame of the BFN timing advance in the CPRI frame of receiving from REC timing reference point and regularly recovers after time of delay of reference point process as local BFN timing;
The method that the described RE of step c sends downlink data is: RE is based on the BFN timing reference of self rebuilding, described downlink data is sent, and the moment that makes the moment of this downlink data by regularly recovering the reference point place arrive the RE antenna opening than this downlink data of appointment shifts to an earlier date downlink data and regularly recovers reference point to antenna opening required time of delay from this.
The method of the BFN timing reference of the described reconstruction of this method step a RE is: RE sends to the time of delay that RE regularly recovers the reference point process with the described CPRI frame of the BFN timing advance in the CPRI frame of receiving from REC timing reference point, and downlink data regularly recovers reference point to the BFN timing as this locality after required time of delay of RE antenna opening from this;
The method that the described RE of step c sends downlink data is: RE is based on the BFN timing reference of self rebuilding, described downlink data is sent, and making this downlink data is the moment of this downlink data arrival RE antenna opening of appointment by the moment of regularly recovering the reference point place.
The described CPRI frame of this method sends to the time of delay that RE regularly recovers the reference point process from REC timing reference point: from the REC timing reference put the delay of the descending output point of REC, the delay from the descending output point of REC to the descending input point of purpose RE and the retardation sum of regularly recovering reference point from the descending input point of this RE to RE.
The described REC of this method step b specifies this downlink data to arrive RE antenna opening method constantly when sending downlink data: this downlink data that REC is placed on expection with described downlink data arrives the position of the pairing CPRI frame of the moment of RE antenna opening, and the CPRI frame is sent;
Then RE described in the step c knows that according to the position of downlink data in the CPRI frame this downlink data of REC appointment arrives the moment of RE antenna opening.
This method further comprises: when initialization or configuration change, REC with data carried by data in the descending CPRI frame with respect to the side-play amount of CPRI frame sequence by high-rise maintenance channel notice RE;
RE is according to position and described side-play amount this downlink data of the knowing REC appointment moment that arrive RE antenna opening of downlink data in the CPRI frame among the step c.
The described REC of this method step b specifies this downlink data to arrive RE antenna opening method constantly when sending downlink data: REC adds in the downlink data that sends to purpose RE and is used to indicate the time tag that this downlink data arrives the moment of RE antenna opening;
RE knows that according to the time tag of downlink data this downlink data of REC appointment arrives the moment of RE antenna opening among the step c.
From above as can be seen, the method of each antenna port downlink data sync of the same base station of maintenance provided by the invention, utilize the reconstruction of the transmission characteristic realization RE side BFN timing reference of CPRI frame, and by specifying downlink data to arrive the mode of purpose RE antenna opening time, the time that makes the downlink data of transmission arrive each antenna opening keeps synchronously, thereby guaranteed the synchronized relation of each sub-district, same base station, the delay uncertainty of having avoided the inner downlink data of REC to transmit in antenna opening.
Description of drawings
Fig. 1 measures schematic diagram time of delay for each section that the down direction data are put RE side antenna opening transmission course from the timing reference of REC;
Fig. 2 is a delay measurements schematic diagram between REC and the RE;
Fig. 3 is the schematic diagram that measure time of delay in the delay measurements between REC and the RE;
Fig. 4 is the schematic flow sheet of preferred embodiment of the present invention.
Embodiment
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
Consider in the base station system inside of adopting the CPRI agreement, data interaction between REC and the RE is sent out realization mutually by continual CPRI frame, thereby thinking of the present invention is: at first utilize REC to rebuild timing reference synchronous between the two to the CPRI frame that RE sends, and then be benchmark with this synchronous timing reference, specify this downlink data to arrive RE antenna opening mode constantly by REC to downlink data that RE sends the time, the downlink data that makes REC send keeps synchronously when arriving the RE antenna opening.
According to the CPRI agreement, include the frame number (BFN) of Node B and the Hyper Frame Number (HFN) of CPRI between inside of base station REC and the RE in the control field of mutual CPRI frame, the frame period of a BFN is 10 milliseconds (ms), comprises 150 HFN among each BFN, and 256 basic frames are arranged among each HFN.The concrete numerical value of BFN and HFN is all to be arranged on the unified timing reference of REC side based on the base station and definite.
Referring to shown in Figure 1, data are recovered the process of reference point from the timing that the timing reference point of REC side sends to the RE side, institute's elapsed time postpones to comprise: the delay T1 that puts the descending output point of REC from the REC timing reference, delay T12 from the descending output point of REC to the descending input point of purpose RE, and the delay T2 that regularly recovers reference point from the descending input point of RE to RE.
Wherein, T1 and T2 be the base station when setting up with regard to fixed known quantity; Postponing T12 can obtain by measuring according to the CPRI agreement.The concrete acquisition process of T12 is referring to shown in Figure 2, the CPRI frame that sends from the descending output point R1 of REC arrives the descending input point R2 of RE through time delay T12, in RE through Toffset the time delay from the up output point R3 of RE and send the up input point R4 that arrives REC through time delay T34.This process, the time of delay of CPRI frame amount can be referring to shown in Figure 3 between REC and the RE.Wherein, postponing Toffset is the delay of RE up-downgoing Frame when deal with data, and its retardation is just to have determined good fixed value when design.T14 is the total delay of the above-mentioned R1-＞R2-＞whole loop-back process of R3-＞R4 of REC measurement.In addition, T12=T34 in general, thus obtain T12=T34=(T14-Toffset)/2.
Still referring to shown in Figure 1, T1 is the delay from the timing reference point of REC to the descending output point of REC.From timing relationship, be to be carved into the descending output point BFN=0 of REC, the delay of CPRI frame between the initial moment of HFN=0 when initial from 10 milliseconds of radio frames of BFN of REC.
T2 is to regularly recovering with reference to the delay of pointing out from the RE input point.
The present invention keeps the specific implementation process of each antenna port downlink method of data synchronization of same base station to comprise:
Step 40, RE is according to the timing information of CPRI frame and the BFN timing reference of T1, T12 and T2 reconstruction RE, and the timing reference point that makes the RE side regularly recover reference point and REC keeps clock synchronization.
Specifically comprise: with the BFN timing of the BFN timing advance T1+T12+T2 in the CPRI frame of receiving as this locality.Such as: will recover the reference point place in the timing of RE and receive BFN=0, the moment of CPRI first frame of HFN=0 deducts T1+T12+T2 as local BFN=0, the CPRI frame initial time of HFN=0.If do not get access to BFN=0, the moment of CPRI first frame of HFN=0, other frame that then also can pass through to be obtained calculates, such as: current obtain for BFN=1, the moment of CPRI first frame of HFN=3, the moment that then will receive this frame deducts T1+T12+T2 as local BFN=1, the moment of CPRI first frame of HFN=3.
Here, if do not consider the error of T1, T12 and T2 itself, BFN timing reference that RE rebuilds and the BFN timing reference among the REC are synchronous.
Step 41, REC indicates the moment that this downlink data arrives the RE antenna opening in the downlink data that sends to purpose RE.
Because according to the CPRI agreement, position and its transmitting time of data in the CPRI frame has one-to-one relationship, therefore the simplest implementation of this step is: REC sends the ad-hoc location that described downlink data is placed on the CPRI frame, and RE just can know that in the position of CPRI frame this downlink data should arrive the moment of RE antenna opening according to downlink data like this.
This process REC can inform RE with respect to the side-play amount of CPRI frame sequence by high-rise maintenance channel with data carried by data in the descending CPRI frame.
Because in the CPRI frame transport process, for specific RE, the BFN of the CPRI frame that it is received and be continuous HFN number, CPRI frame data carried by data also is continuous, and incidence relation between the two generally can not change, therefore, for specific RE, as long as REC when initialization or configuration change with the side-play amount that taken place by high-rise maintenance channel notice RE, RE just can be according to the position of downlink data in the CPRI frame and the moment of the described side-play amount appointment arrival antenna opening of determining to receive data.
Data carried by data is as follows with respect to the side-play amount regulation of descending CPRI frame sequence in the descending CPRI frame:
The basic frame of first of the descending CPRI frame of BFN=0, HFN=0 institute data carried by data, if when benchmark timing reference initial time arrives immediately in certain reference point, send as antenna opening, then defining side-play amount is 0.Like this, suppose that REC wishes that certain downlink data is sending from antenna opening with respect to RE side timing reference 0 constantly, then REC can be placed on this downlink data in first basic frame of the descending CPRI frame of BFN=0, HFN=0.
The basic frame of first of the descending CPRI frame of BFN=0, HFN=0 institute data carried by data, if with respect to the benchmark timing reference constantly n chip of deviation (chip) the time be engraved in certain reference point, as the antenna opening transmission, then defining side-play amount is n.Like this, suppose that REC wishes that certain downlink data sent from antenna opening with respect to the moment of n chip of RE side timing reference, then REC can be placed on this downlink data in first basic frame of the descending CPRI frame of BFN=0, HFN=0; In like manner, if REC wishes that downlink data is sending from antenna opening with respect to RE side timing reference the 0th constantly, then REC can be placed on this downlink data in the position of n chip before first basic frame of the descending CPRI frame of BFN=0, HFN=0.
Certainly above-mentioned just preferred embodiment can add in the downlink data that sends to purpose RE that also a specific time tag indicates the moment that this downlink data arrives the RE antenna opening.
Step 42, RE sent current downlink data according to the moment of the arrival antenna opening of BFN timing reference of rebuilding and current downlink data appointment, and making its moment that arrives antenna opening is the described appointment moment.
Referring to shown in Figure 1, T3 is that data are regularly recovered the delay of reference point to the descending output point of RE from RE, and T4 is the delay from the descending output point of RE to antenna opening, and the value of T3 and T4 is the known quantity of just having decided when RE designs.Like this, RE can send current downlink data based on the BFN timing reference of current reconstruction, making the moment of these data by recovering reference point shift to an earlier date the time of T3+T4 than the moment that these data of REC appointment appear at antenna opening, is the moment of REC appointment thereby data arrive the moment of antenna opening.
To send the basic frame of first of BFN=0, HFN=0 institute data carried by data is example: if the side-play amount of predesignating is 0, then RE shifts to an earlier date the T3+T4 time with BFN=0 than 0 constantly recovering the reference point place, and the downlink data of the basic frame of first of HFN=0 sends; If the side-play amount of predesignating is n, then RE shifts to an earlier date the T3+T4 time with BFN=0 at recovery reference point place constantly than n chip, and the downlink data of the basic frame of first of HFN=0 sends.Process of transmitting for the data of other position carry of CPRI frame can be by that analogy.
By above-mentioned steps, just realized the downlink data between the transmission channel on the different RE in different districts and the same sub-district synchronously.
In addition, implementation of the present invention is not limited to a above-mentioned example, such as: in described step 40, the BFN timing reference that RE stresses to build not necessarily is consistent with REC side timing reference, can shift to an earlier date or wrong back one period set time, as long as this section regular time is that RE is known.Preferred implementation be the RE side when rebuilding timing reference, earlier described T3 and T4 are taken into account.
Step 40 comprises during concrete the execution: in the RE side with the BFN timing advance T1+T12+T2+ (T3+T4) in the CPRI frame of receiving as local BFN regularly.For example: will recover the reference point place in the timing of RE and receive BFN=0, the moment of CPRI first frame of HFN=0 deducts T1+T12+T2+ (T3+T4) as local BFN=0, the CPRI frame initial time of HFN=0.
RE can control the transmission of downlink data based on the BFN timing reference of current reconstruction in step 42, making it arrive the moment of regularly recovering the reference point place is the specified moment of REC with respect to RE side BFN timing reference, recover the time of delay T3+T4 of reference point and need not to reserve to antenna opening, so, when downlink data arrived antenna opening, it was the appointment moment of REC just with respect to REC side timing reference.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1, a kind of method that keeps each antenna port downlink data sync of same base station is characterized in that, comprising:
A) RE is according to the CPRI frame that receives, and the CPRI frame sends to the time of delay that RE regularly recovers the reference point process from REC timing reference point, rebuilds the BFN timing reference of RE;
B) REC is specifying this downlink data to arrive the moment of RE antenna opening when RE sends downlink data;
C) RE is according to the moment of specified this downlink data arrival RE antenna opening of the current downlink data that receives, and the BFN timing reference based on self rebuilding sends this downlink data, and the moment that makes these data arrive antenna opening is the described appointment moment.
2, method according to claim 1, it is characterized in that the method for the BFN timing reference of the described reconstruction of step a RE is: RE sends to RE with the described CPRI frame of the BFN timing advance in the CPRI frame of receiving from REC timing reference point and regularly recovers after time of delay of reference point process as local BFN timing;
The method that the described RE of step c sends downlink data is: RE is based on the BFN timing reference of self rebuilding, described downlink data is sent, and the moment that makes the moment of this downlink data by regularly recovering the reference point place arrive the RE antenna opening than this downlink data of appointment shifts to an earlier date downlink data and regularly recovers reference point to antenna opening required time of delay from this.
3, method according to claim 1, it is characterized in that, the method of the BFN timing reference of the described reconstruction of step a RE is: RE sends to the time of delay that RE regularly recovers the reference point process with the described CPRI frame of the BFN timing advance in the CPRI frame of receiving from REC timing reference point, and downlink data regularly recovers reference point to the BFN timing as this locality after required time of delay of RE antenna opening from this;
The method that the described RE of step c sends downlink data is: RE is based on the BFN timing reference of self rebuilding, described downlink data is sent, and making this downlink data is the moment of this downlink data arrival RE antenna opening of appointment by the moment of regularly recovering the reference point place.
4, according to claim 1 or 2 or 3 described methods, it is characterized in that described CPRI frame sends to the time of delay that RE regularly recovers the reference point process from REC timing reference point and is: from the REC timing reference put the delay of the descending output point of REC, the delay from the descending output point of REC to the descending input point of purpose RE and the retardation sum of regularly recovering reference point from the descending input point of this RE to RE.
5, method according to claim 1, it is characterized in that, the described REC of step b specifies this downlink data to arrive RE antenna opening method constantly when sending downlink data: this downlink data that REC is placed on expection with described downlink data arrives the position of the pairing CPRI frame of the moment of RE antenna opening, and the CPRI frame is sent;
Then RE described in the step c knows that according to the position of downlink data in the CPRI frame this downlink data of REC appointment arrives the moment of RE antenna opening.
6, method according to claim 5 is characterized in that, this method further comprises: when initialization or configuration change, REC with data carried by data in the descending CPRI frame with respect to the side-play amount of CPRI frame sequence by high-rise maintenance channel notice RE;
RE is according to position and described side-play amount this downlink data of the knowing REC appointment moment that arrive RE antenna opening of downlink data in the CPRI frame among the step c.
7, method according to claim 1, it is characterized in that the method that the described REC of step b specifies this downlink data to arrive the RE antenna opening moment when sending downlink data is: REC adds in the downlink data that sends to purpose RE and is used to indicate the time tag that this downlink data arrives the moment of RE antenna opening;
RE knows that according to the time tag of downlink data this downlink data of REC appointment arrives the moment of RE antenna opening among the step c.
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| CNB2005100775190A CN100518016C (en) | 2005-06-14 | 2005-06-14 | Method for holding every antenna port downlink data synchronization of the same base station |
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| CNB2005100775190A CN100518016C (en) | 2005-06-14 | 2005-06-14 | Method for holding every antenna port downlink data synchronization of the same base station |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101500303B (en) * | 2008-01-30 | 2011-01-26 | 京信通信系统（中国）有限公司 | Synchronization method applied for WCDMA system same frequency multi-cell weak power base station |
| CN101982008A (en) * | 2008-03-31 | 2011-02-23 | 爱立信电话股份有限公司 | Radio equipment (RE)-based synchronization |
| CN101547041B (en) * | 2008-03-26 | 2013-04-17 | 中国移动通信集团公司 | Method, device and system for calibration control of communication channel in radio base station |
| CN101990136B (en) * | 2009-08-07 | 2013-08-07 | 华为技术有限公司 | Wavelength consultation method, system and device |
| CN104322118A (en) * | 2014-04-18 | 2015-01-28 | 华为技术有限公司 | Sending method and device of downlink data |
| WO2016078401A1 (en) * | 2014-11-21 | 2016-05-26 | 中兴通讯股份有限公司 | Time sequence adjustment method and apparatus combining baseband and radio frequency |
-
2005
- 2005-06-14 CN CNB2005100775190A patent/CN100518016C/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101500303B (en) * | 2008-01-30 | 2011-01-26 | 京信通信系统（中国）有限公司 | Synchronization method applied for WCDMA system same frequency multi-cell weak power base station |
| CN101547041B (en) * | 2008-03-26 | 2013-04-17 | 中国移动通信集团公司 | Method, device and system for calibration control of communication channel in radio base station |
| CN101982008A (en) * | 2008-03-31 | 2011-02-23 | 爱立信电话股份有限公司 | Radio equipment (RE)-based synchronization |
| CN101990136B (en) * | 2009-08-07 | 2013-08-07 | 华为技术有限公司 | Wavelength consultation method, system and device |
| CN104322118A (en) * | 2014-04-18 | 2015-01-28 | 华为技术有限公司 | Sending method and device of downlink data |
| WO2015157988A1 (en) * | 2014-04-18 | 2015-10-22 | 华为技术有限公司 | Downlink data sending method and device |
| WO2016078401A1 (en) * | 2014-11-21 | 2016-05-26 | 中兴通讯股份有限公司 | Time sequence adjustment method and apparatus combining baseband and radio frequency |
| CN105682214A (en) * | 2014-11-21 | 2016-06-15 | 中兴通讯股份有限公司 | Baseband and radio frequency combined time sequence adjustment method and device |
| CN105682214B (en) * | 2014-11-21 | 2020-01-24 | 中兴通讯股份有限公司 | Baseband and radio frequency combined time sequence adjusting method and device |
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|---|---|
| CN100518016C (en) | 2009-07-22 |
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