CN103428825A - Radio remote unit selecting method - Google Patents
Radio remote unit selecting method Download PDFInfo
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- CN103428825A CN103428825A CN2012101504124A CN201210150412A CN103428825A CN 103428825 A CN103428825 A CN 103428825A CN 2012101504124 A CN2012101504124 A CN 2012101504124A CN 201210150412 A CN201210150412 A CN 201210150412A CN 103428825 A CN103428825 A CN 103428825A
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Abstract
The invention provides a radio remote unit (RRU) selecting method. The radio remote unit selecting method comprises the following steps of A, using RRU capable of receiving uplink signals of first user equipment (UE) at uplink time slots to receive uplink subframes from first UE to obtain the uplink channel situation of each of RRU; B, selecting one RRU with the best channel situation from the RRU, wherein the selected RRU is marked as a first RRU; C, using the first RRU to send downlink subframes to the UE at downlink time slots, receive the uplink subframes from the UE at a next uplink time slot and obtain uplink data from the uplink subframes. The radio remote unit selecting method can avoid downlink interference and simplify the uplink treating processes.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to a kind of system of selection of Remote Radio Unit.
Background technology
Along with China Railway High-speed is constantly built and raises speed, carry out high-quality communication and become problem demanding prompt solution on high ferro.
The overlay network of high ferro comprises global system for mobile communications (GSM), Wideband Code Division Multiple Access (WCDMA) (WCDMA) system, code division multiple access (CDMA) system etc. at present.It is low that these networks exist transmission data rate, and cutting off rate is high, the problems such as poor user experience.Long Term Evolution project (LTE) system of rising has higher speed, higher spectrum efficiency, characteristics such as carrier bandwidths and better system compatibility more flexibly, fully meet the demand of broadband wireless access, really having realized the fusion of fixed network and mobile network, is therefore the inexorable trend of high ferro Communication Development to LTE evolution.
LTE can provide simply, the network of efficient, low time delay, low cost, can provide safe speech and data service simultaneously.In addition, the network architecture of LTE based on all-IP, allow the car-ground communication system that telecom operators and railway operator joint development are unified, and reuse website and the equipment of having disposed, the cost of reducing investment outlay.Because the LTE system has above advantage, therefore the high-speed railway wide-band communication system on the basis based on TD_LTE will be the high ferro communication system developing direction in future.
In high-speed railways, because the rapid movement of high ferro causes the community switching frequent, cutting off rate increases.In order to solve the problem of frequent switching cell, the distributed transmission means of the general employing of high ferro communication system.The distributing antenna system of communicating by letter for high ferro as shown in Figure 1, every 3000m, a Remote Radio Unit is set along orbital direction, a plurality of RRU connect same base station processing unit (BBU), realize that by the network configuration that adopts BBU+RRU many communities merge, expand the coverage of single subdistrict, thereby can solve the problem of frequent switching cell.
In distributing antenna system, if all RRU send downlink data simultaneously, if UE just in adjacent R RU covering overlapping area, UE will receive the signal that a plurality of RRU send.Due to UE, in high-speed mobile, doppler shift effect will be can not ignore, and the Doppler frequency shift difference of these signals is superimposed and will interferes with each other.And UE is when adjacent R RU covering overlapping area sends upstream data, a plurality of RRU can receive up information, have equally the frequency deviation difference of each signal, so also can't carry out the merging of signal, each RRU is the reception & disposal data separately, and all RRU receive upstream data, process complicated.
Summary of the invention
The invention provides the system of selection of a kind of RRU, from a plurality of RRU that receive same UE, select a RRU carry out the reception & disposal upstream data and send downlink data, thereby avoid descending interference, and simplify up processing procedure.
The system of selection of a kind of radio frequency remote unit RRU that the embodiment of the present invention provides, comprise the steps:
A, at ascending time slot, each RRU that can receive first user equipment UE upward signal receives the sub-frame of uplink from a UE, obtains the up channel situation of described each RRU;
B, select a best RRU of up channel situation from described RRU, selected RRU is denoted as a RRU;
C, a RRU send descending sub frame at descending time slot to UE, and a RRU receives from the sub-frame of uplink of UE and obtain upstream data from sub-frame of uplink at next ascending time slot.
Preferably, the described upstream data that obtains from sub-frame of uplink is: a RRU carries out the operations such as equilibrium, demodulation, decoding to the sub-frame of uplink received, and obtains the upstream data that will receive.
Preferably, steps A comprises:
A1, at ascending time slot, each RRU that can receive same UE upward signal receives the sub-frame of uplink that this UE sends, and obtains pilot frequency information.
A2, RRU generate local pilot tone, according to the pilot tone and the local pilot tone that receive, obtain channel frequency domain response;
A3, RRU transform to time domain by channel frequency domain response, obtain the channel response of time domain, obtain gain and the time delay of channel according to the channel response of time domain.
Preferably, from described RRU, select a best RRU of up channel situation to comprise: from described RRU, at first the selective channel gain is greater than the RRU of predetermined threshold, then in these RRU, selects a RRU of time delay minimum.
As can be seen from the above technical solutions, from each RRU that can receive the UE upward signal, select a best RRU of up channel situation to send downlink data and receive upstream data, other RRU only carry out the judgement of the situation of up channel, can simplify processing procedure like this, and avoid a plurality of RRU to send the interference of downlink data to UE.
The accompanying drawing explanation
Fig. 1 is the distributing antenna system schematic diagram for high ferro communication;
The system of selection flow chart of a kind of Remote Radio Unit that Fig. 2 provides for the embodiment of the present invention.
Embodiment
Basic thought of the present invention is, in distributing antenna system, selects the sending and receiving that a RRU carries out data in a plurality of RRU of Cong Yige community, improves the data receiver performance, and simplifies handling process.
Clearer for the know-why, characteristics and the technique effect that make technical solution of the present invention, below in conjunction with specific embodiment, the present invention program is described in detail.
In the high ferro communication system, because the data of all users on high ferro are received and dispatched by the trunking on train, and then communicate with the base station on ground, so can think in each ascending-descending subframes and basically can have the business datum of UE to be sent or receive, the channel difference of up-downgoing is little.
Each RRU that UE sends in upstream data Hou， community can receive the signal that UE sends, and from the signal received, extracts pilot frequency information, then generates local pilot frequency information.Obtain the frequency domain response of channel according to the local pilot tone of the pilot tone received and generation, then the frequency domain response of channel is transformed into to time domain, judge gain and the time delay of channel according to the time-domain response of channel, can judge the best RRU of channel conditions according to channel gain and the time delay of RRU, then utilize this RRU send downlink service data subsequently and receive upstream data subsequently, the RRU that then carry out next time according to the upstream data received base station again selects.
The system of selection flow process of a kind of Remote Radio Unit that the embodiment of the present invention provides as shown in Figure 2, comprises the steps:
Step 201: all RRU that can receive certain UE data receive the sub-frame of uplink that this UE sends, and obtain pilot frequency information.
Step 202:RRU generates local pilot tone, according to the pilot tone and the local pilot tone that receive, obtains channel frequency domain response.
Step 203:RRU transforms to time domain by channel frequency domain response, obtains the channel response of time domain, obtains gain and the time delay of channel according to the channel response of time domain.
Step 204: select a best RRU of up channel situation as a RRU from described RRU.Specifically, at first the selective channel gain is greater than the RRU of a certain threshold value (this threshold value is obtained by empirical value), then in these RRU, selects the RRU of time delay minimum to be designated as a RRU.A described RRU sends descending sub frame to UE, until receive next sub-frame of uplink.In community, other RRU does not send descending sub frame to described EU.
Step 205:UE sends sub-frame of uplink, and a RRU carries out the operations such as equilibrium, demodulation, decoding to the sub-frame of uplink received, and obtains last reception data.And return to step 201.
Wherein, a selected RRU reception detection upstream data refers to that the RRU of selection carries out the operations such as equilibrium, demodulation, decoding to the data that receive, and other RRU needn't carry out these processing.But all RRU need the situation according to the information judgement up channel received, according to RRU of Information Selection of up channel as the RRU that sends downlink service data next time.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (4)
1. the system of selection of a radio frequency remote unit RRU, is characterized in that, comprises the steps:
A, at ascending time slot, each RRU that can receive first user equipment UE upward signal receives the sub-frame of uplink from a UE, obtains the up channel situation of described each RRU;
B, select a best RRU of up channel situation from described RRU, selected RRU is denoted as a RRU;
C, a RRU send descending sub frame at descending time slot to UE, and a RRU receives from the sub-frame of uplink of UE and obtain upstream data from sub-frame of uplink at next ascending time slot.
2. method according to claim 1, is characterized in that, the described upstream data that obtains from sub-frame of uplink is: a RRU carries out the operations such as equilibrium, demodulation, decoding to the sub-frame of uplink received, and obtains the upstream data that will receive.
3. method according to claim 1, is characterized in that, steps A comprises:
A1, at ascending time slot, each RRU that can receive same UE upward signal receives the sub-frame of uplink that this UE sends, and obtains pilot frequency information.
A2, RRU generate local pilot tone, according to the pilot tone and the local pilot tone that receive, obtain channel frequency domain response;
A3, RRU transform to time domain by channel frequency domain response, obtain the channel response of time domain, obtain gain and the time delay of channel according to the channel response of time domain.
4. method according to claim 1, it is characterized in that, from described RRU, select a best RRU of up channel situation to comprise: from described RRU, at first the selective channel gain is greater than the RRU of predetermined threshold, then in these RRU, selects a RRU of time delay minimum.
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| CN2012101504124A CN103428825A (en) | 2012-05-15 | 2012-05-15 | Radio remote unit selecting method |
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| CN2012101504124A CN103428825A (en) | 2012-05-15 | 2012-05-15 | Radio remote unit selecting method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104683270A (en) * | 2015-03-05 | 2015-06-03 | 苏州微站通信科技有限公司 | Channel frequency offset estimating method for LTE small base station cell merge |
| CN106488566A (en) * | 2015-09-02 | 2017-03-08 | 普天信息技术有限公司 | The method of scheduling of resource, controller and base station in a kind of high ferro communication system |
| CN106685508A (en) * | 2017-02-10 | 2017-05-17 | 京信通信技术(广州)有限公司 | Data transmission method and data transmission device |
| WO2017106999A1 (en) * | 2015-12-21 | 2017-06-29 | 华为技术有限公司 | Method and system for acquiring frequency response difference of radio remote unit (rru) channel, and base station equipment |
| CN113890716A (en) * | 2021-10-26 | 2022-01-04 | 中国联合网络通信集团有限公司 | Method and device for identifying pRRU and storage medium |
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| CN101198175A (en) * | 2007-12-05 | 2008-06-11 | 中兴通讯股份有限公司 | Switching method and system based on distributed base station system |
| CN101448306A (en) * | 2008-12-26 | 2009-06-03 | 华为技术有限公司 | Method and system for GSM circuit domain service station address selection, and radio frequency remote unit |
| CN101877687A (en) * | 2009-04-28 | 2010-11-03 | 鼎桥通信技术有限公司 | Method for transmitting downlink signal |
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| CN1661941A (en) * | 2004-02-23 | 2005-08-31 | 华为技术有限公司 | Distributed base stations and data interactive method |
| CN101198175A (en) * | 2007-12-05 | 2008-06-11 | 中兴通讯股份有限公司 | Switching method and system based on distributed base station system |
| CN101448306A (en) * | 2008-12-26 | 2009-06-03 | 华为技术有限公司 | Method and system for GSM circuit domain service station address selection, and radio frequency remote unit |
| CN101877687A (en) * | 2009-04-28 | 2010-11-03 | 鼎桥通信技术有限公司 | Method for transmitting downlink signal |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104683270A (en) * | 2015-03-05 | 2015-06-03 | 苏州微站通信科技有限公司 | Channel frequency offset estimating method for LTE small base station cell merge |
| CN106488566A (en) * | 2015-09-02 | 2017-03-08 | 普天信息技术有限公司 | The method of scheduling of resource, controller and base station in a kind of high ferro communication system |
| CN106488566B (en) * | 2015-09-02 | 2019-09-06 | 普天信息技术有限公司 | Method, controller and the base station of scheduling of resource in a kind of high-speed rail communication system |
| WO2017106999A1 (en) * | 2015-12-21 | 2017-06-29 | 华为技术有限公司 | Method and system for acquiring frequency response difference of radio remote unit (rru) channel, and base station equipment |
| US10420172B2 (en) | 2015-12-21 | 2019-09-17 | Huawei Technologies Co., Ltd. | RRU channel frequency response difference obtaining method and system, and base station device |
| CN106685508A (en) * | 2017-02-10 | 2017-05-17 | 京信通信技术(广州)有限公司 | Data transmission method and data transmission device |
| WO2018145529A1 (en) * | 2017-02-10 | 2018-08-16 | 京信通信系统（中国）有限公司 | Data transmission method and device |
| CN106685508B (en) * | 2017-02-10 | 2020-06-23 | 京信通信系统（中国）有限公司 | Data transmission method and device |
| CN113890716A (en) * | 2021-10-26 | 2022-01-04 | 中国联合网络通信集团有限公司 | Method and device for identifying pRRU and storage medium |
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Owner name: PUTIAN IT TECH INST CO., LTD. Free format text: FORMER OWNER: CHINA POTEVIO CO., LTD. Effective date: 20131206 |
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Effective date of registration: 20131206 Address after: 100080 Beijing, Haidian, North Street, No. two, No. 6, No. Applicant after: Putian IT Tech Inst Co., Ltd. Address before: 100080, No. two, 2 street, Zhongguancun science and Technology Park, Beijing, Haidian District Applicant before: China Potevio Information Industry Co., Ltd. |
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