CN101459633A - System for lowering inter-cell interference and method therefor - Google Patents
System for lowering inter-cell interference and method therefor Download PDFInfo
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- CN101459633A CN101459633A CNA200710199087XA CN200710199087A CN101459633A CN 101459633 A CN101459633 A CN 101459633A CN A200710199087X A CNA200710199087X A CN A200710199087XA CN 200710199087 A CN200710199087 A CN 200710199087A CN 101459633 A CN101459633 A CN 101459633A
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Abstract
The invention discloses a system for lowering inter-cell interference, wherein a channel quality feedback unit is used to collect channel quality information of a base station, the channel quality information is sent to a dispatching server, a pre-coding matrix generator is used to receive a verdict result of the dispatching server, a pre-coding matrix is generated according to the verdict result, the pre-coding matrix is sent to a precoder, the precoder receives the pre-coding matrix, data streams which are distributed to each neighboring base station are pre-coded and modulated according to the pre-coding matrix, a logical function unit is provided with the dispatching server and a data dispatcher, wherein the dispatching server is used to receive the channel quality information and to determine a dispatching verdict to mobile station data streams according to the channel quality information, the dispatching verdict is sent to the data dispatcher, the data dispatcher receives a dispatching verdict result and reuses the data of a neighboring mobile station according to the dispatching verdict result, and the data is sent to each neighboring base station. The invention also discloses a method for lowering the inter-cell interference.
Description
Technical field
The present invention relates to the broadband wireless communication technique in a kind of moving communicating field, especially, relate to a kind of system and method thereof that reduces presence of intercell interference.
Background technology
LTE (3GPP Long Term Evolution, the 3GPP Long Term Evolution), UMB (Ultra MobileBroadband, Ultra-Mobile Broadband) and mobile WiMAX (Worldwide Interoperability forMicrowave Access, micro-wave access to global intercommunication) etc. next generation mobile communication system is mainly based on the multi-access mode of OFDMA (orthogonal frequency division multiplexing multiple access access), under given system bandwidth, on the angle of frequency domain, different users realizes the purpose that multiple access inserts by the orthogonal sub-carriers resource that takies some.
BWA based on the OFDMA multi-access mode, under the lower situation of frequency duplex factor as one, especially adopt under the situation of same carrier at neighbor cell,, cause the interference of minizone very serious because neighbor cell may use identical sub-carrier resources.Because the existence of presence of intercell interference causes the performance of Cell Edge User to suffer very big decline, causes capacity mainly to be subject to the interference of minizone.Usually the technology based on OFDMA multi-access mode reduction presence of intercell interference commonly used mainly comprises partial frequency multiplexing, soft-frequency reuse, minizone scrambling and intelligent antenna technology.Intelligent antenna technology reduces the interference of subscriber signal to other community users by the angle of departure is limited on certain beam direction.Except intelligent antenna technology, in order to realize high sector throughput and spectrum efficiency, in LTE, UMB and mobile WiMAX system, introduced MIMO (multi-input/output antenna) technology in a large number, but at present in the multi-input/output antenna technology based on single base station, usually do not consider that reducing presence of intercell interference designs, the user who is in cell edge is subjected to the influence of other cell signals interference more serious, greatly reduces this type of user's performance.Thus, needs solve the problem of inter-cell interference in traditional multi-input multi-output antenna system.
Summary of the invention
Technical problem to be solved by this invention provides a kind of system that reduces presence of intercell interference, can lower presence of intercell interference, improves the availability of frequency spectrum.
Technical scheme is as follows:
A kind of system that reduces presence of intercell interference comprises at least one base station, and described base station is provided with channel-quality feedback unit, pre-coding matrix generator and precoder, wherein,
The channel-quality feedback unit is used to gather the channel quality information of described base station, and described channel quality information is sent to dispatch server;
The pre-coding matrix generator receives the court verdict of described dispatch server, is used for producing pre-coding matrix according to described court verdict, and described pre-coding matrix is sent to described precoder;
Precoder receives described pre-coding matrix, is used for according to described pre-coding matrix the data flow that is distributed to each adjacent base station being carried out precoding and modulation;
Also comprise logic function unit, described logic function unit is provided with dispatch server and data distributor, wherein,
Dispatch server receives described channel quality information, is used for determining the scheduling of mobile station data stream is adjudicated according to described channel quality information, and described scheduling judgement is sent to described data distributor;
Data distributor receives described scheduling court verdict, is used for according to described scheduling court verdict the data of adjacent travelling carriage being carried out multiplexing, and is distributed to each adjacent base station.
Preferably, be connected by backbone network between described base station and the logic function unit, described channel-quality feedback unit by described backbone network to described dispatch server transmitting channel quality information; Described data after multiplexing are sent to each adjacent base station by described backbone network.
Preferably, the signal that described precoder goes out from many antenna transmission through precoding and modulation comprises each adjacent base station and covers the data message of travelling carriage down, and described data message is that the data in the packet of travelling carriage are issued in the base station.
Another technical problem solved by the invention provides a kind of method that reduces presence of intercell interference, can lower presence of intercell interference, improves the availability of frequency spectrum.
Technical scheme is as follows:
A kind of method that reduces presence of intercell interference, step comprises:
(1) channel quality information on the link is separately fed back to dispatch server in adjacent each base station of each of collaborative work;
(2) described dispatch server is made scheduling judgement according to the channel quality information of each base station feedback, and should dispatch to adjudicate and send to data distributor;
(3) described data distributor covers down the data of travelling carriage according to described scheduling judgement with each adjacent base station and carries out multiplexingly on identical Resource Block, and will comprise each adjacent base station and cover down that the multiplex data of travelling carriage is distributed to adjacent each base station;
(4) each base station produces pre-coding matrix by the pre-coding matrix generator, and precoder carries out precoding and modulation according to described pre-coding matrix to the data flow that is distributed to the base station, the travelling carriage under covering to described base station by many antenna transmission.
Further, in the step (2), described dispatch server is determined the scheduling of the mobile station data stream under the covering of described base station is adjudicated by the channel quality information of each adjacent base station of collection collaborative work.
Further, in the step (4), each base station comprises the described base station covering data message of travelling carriage down through precoding and modulation from the signal that many antenna transmission go out.
Further, in the step (1), adjacent each base station of each of described collaborative work is fed back channel quality information on the link separately by backbone network to dispatch server; In the step (3), described data distributor is distributed to adjacent each base station by the multiplex data that backbone network will comprise travelling carriage under each adjacent base station covering.
By method and apparatus of the present invention, allow a plurality of adjacent base stations by working in coordination with between the base station, use identical Radio Resource simultaneously for one or more travelling carriages provide service by dispatch server, can lower presence of intercell interference, improve the availability of frequency spectrum.Especially in the cellular radio Communication system of the multiplexing factor of low frequency, can increase the capacity of system greatly.
Description of drawings
Fig. 1 is the Application Scenarios-Example figure that reduces presence of intercell interference among the present invention;
Fig. 2 is the composition frame chart that reduces the system of presence of intercell interference among the present invention;
Fig. 3 is the flow chart that reduces the method for presence of intercell interference.
Embodiment
Be example with the broadband cellular wireless communication system below, the present invention is described in further detail with the preferred embodiment of the present invention in conjunction with the accompanying drawings.
As shown in Figure 1, be the Application Scenarios-Example figure that reduces presence of intercell interference among the present invention.In cellular radio Communication system, a plurality of adjacent base station collaborative works use identical resource to provide service for a plurality of travelling carriages simultaneously.Logic function unit 100 is provided with dispatch server 101 and data distributor 103, connects by backbone network (Backbone) 102 between each adjacent base station and the logic function unit 100.Wherein, dispatch server 101 is responsible for collecting the information of the base station of collaborative works, determines the service relation between base station and travelling carriage, makes the scheduling judgement, and should dispatch to adjudicate and send to data distributor 103; Data distributor 103 main scheduling court verdicts according to dispatch server 101 carry out the data of a plurality of travelling carriages multiplexing, and are distributed to each adjacent base station.As shown in FIG., MS (travelling carriage) 1 provides service by base station (BS) 1 and BS2, and MS2 provides service by BS2 and BS3, and MS3 provides service by BS1 and BS3, and BS1, BS2 are connected with logic function unit 100 by backbone network (Backbone) 102 with BS3.
As shown in Figure 2, be the composition frame chart that reduces the system of presence of intercell interference among the present invention.The logic function unit 100 of this device is provided with dispatch server 101 and data distributor 103, wherein, data distributor 103 main scheduling court verdicts according to dispatch server 101, carry out the data of a plurality of travelling carriages multiplexing, and being distributed to each adjacent base station, each circuit-switched data of distribution is sent to each adjacent base station by Backbone.Mainly according to the channel quality information of the channel-quality feedback unit 201 of each adjacent base station, the information of collecting each adjacent base station of collaborative work is determined the scheduling judgement to a plurality of mobile station datas streams for dispatch server 101.
The place, base station is provided with channel-quality feedback unit 201, pre-coding matrix generator 202 and precoder 203.Channel-quality feedback unit 201 sends the channel quality information that each base station uplinks feedback is come to dispatch server 101, channel-quality feedback unit 201 by Backbone102 to dispatch server 101 transmitting channel quality information.The pre-coding matrix generator 202 at place, base station produces pre-coding matrix according to the dispatch server court verdict.203 of the precoders at base station place come the data flow that is distributed to each adjacent base station is carried out pre-encode operation according to pre-coding matrix.The signal that each base station goes out from many antenna transmission through precoding and modulation comprises the data message of a plurality of travelling carriages, and this data message is that the data in the packet of travelling carriage are issued in the base station.
As shown in Figure 3, be the flow chart that reduces the method for cellular radio Communication system presence of intercell interference.
The present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (7)
1, a kind of system that reduces presence of intercell interference comprises at least one base station, it is characterized in that, described base station is provided with channel-quality feedback unit, pre-coding matrix generator and precoder, wherein,
The channel-quality feedback unit is used to gather the channel quality information of described base station, and described channel quality information is sent to dispatch server;
The pre-coding matrix generator receives the court verdict of described dispatch server, is used for producing pre-coding matrix according to described court verdict, and described pre-coding matrix is sent to described precoder;
Precoder receives described pre-coding matrix, is used for according to described pre-coding matrix the data flow that is distributed to each adjacent base station being carried out precoding and modulation;
Also comprise logic function unit, described logic function unit is provided with dispatch server and data distributor, wherein,
Dispatch server receives described channel quality information, is used for determining the scheduling of mobile station data stream is adjudicated according to described channel quality information, and described scheduling judgement is sent to described data distributor;
Data distributor receives described scheduling court verdict, is used for according to described scheduling court verdict the data of adjacent travelling carriage being carried out multiplexing, and is distributed to each adjacent base station.
2, the system of reduction presence of intercell interference as claimed in claim 1, it is characterized in that, be connected by backbone network between described base station and the logic function unit, described channel-quality feedback unit by described backbone network to described dispatch server transmitting channel quality information; Described data after multiplexing are sent to each adjacent base station by described backbone network.
3, the system of reduction presence of intercell interference as claimed in claim 1, it is characterized in that, the signal that described precoder goes out from many antenna transmission through precoding and modulation comprises each adjacent base station and covers the data message of travelling carriage down, and described data message is that the data in the packet of travelling carriage are issued in the base station.
4, a kind of method that reduces presence of intercell interference, step comprises:
(1) channel quality information on the link is separately fed back to dispatch server in adjacent each base station of each of collaborative work;
(2) described dispatch server is made scheduling judgement according to the channel quality information of each base station feedback, and should dispatch to adjudicate and send to data distributor;
(3) described data distributor covers down the data of travelling carriage according to described scheduling judgement with each adjacent base station and carries out multiplexingly on identical Resource Block, and will comprise each adjacent base station and cover down that the multiplex data of travelling carriage is distributed to adjacent each base station;
(4) each base station produces pre-coding matrix by the pre-coding matrix generator, and precoder carries out precoding and modulation according to described pre-coding matrix to the data flow that is distributed to the base station, the travelling carriage under covering to described base station by many antenna transmission.
5, the method for reduction presence of intercell interference according to claim 4, it is characterized in that, in the step (2), described dispatch server is determined the scheduling of the mobile station data stream under the covering of described base station is adjudicated by the channel quality information of each adjacent base station of collection collaborative work.
6, the method for reduction presence of intercell interference according to claim 4 is characterized in that, in the step (4), each base station comprises the described base station covering data message of travelling carriage down through precoding and modulation from the signal that many antenna transmission go out.
7, the method for reduction presence of intercell interference according to claim 4 is characterized in that, in the step (1), adjacent each base station of each of described collaborative work is fed back channel quality information on the link separately by backbone network to dispatch server; In the step (3), described data distributor is distributed to adjacent each base station by the multiplex data that backbone network will comprise travelling carriage under each adjacent base station covering.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200710199087XA CN101459633B (en) | 2007-12-12 | 2007-12-12 | System for lowering inter-cell interference and method therefor |
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| CN200710199087XA CN101459633B (en) | 2007-12-12 | 2007-12-12 | System for lowering inter-cell interference and method therefor |
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| CN101459633A true CN101459633A (en) | 2009-06-17 |
| CN101459633B CN101459633B (en) | 2012-05-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102598751A (en) * | 2011-05-27 | 2012-07-18 | 华为技术有限公司 | Method for cell interference coordination and base station |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7170876B2 (en) * | 2002-04-30 | 2007-01-30 | Qualcomm, Inc. | Outer-loop scheduling design for communication systems with channel quality feedback mechanisms |
| ES2290530T3 (en) * | 2003-12-22 | 2008-02-16 | Telefonaktiebolaget Lm Ericsson (Publ) | MEASUREMENT METHOD FOR SPACE PROGRAMMING. |
| CN1819690B (en) * | 2006-03-31 | 2011-03-23 | 北京邮电大学 | Down interfere inhibition for FDD/OFDM |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102598751A (en) * | 2011-05-27 | 2012-07-18 | 华为技术有限公司 | Method for cell interference coordination and base station |
| CN102598751B (en) * | 2011-05-27 | 2014-06-25 | 华为技术有限公司 | Method for cell interference coordination and base station |
| US9119084B2 (en) | 2011-05-27 | 2015-08-25 | Huawei Technologies Co., Ltd. | Method and base station for coordinating cell interference |
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| CN101459633B (en) | 2012-05-09 |
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