CN102170304A - Interference elimination method of multi-cell base station cooperation - Google Patents
Interference elimination method of multi-cell base station cooperation Download PDFInfo
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- CN102170304A CN102170304A CN2011101366420A CN201110136642A CN102170304A CN 102170304 A CN102170304 A CN 102170304A CN 2011101366420 A CN2011101366420 A CN 2011101366420A CN 201110136642 A CN201110136642 A CN 201110136642A CN 102170304 A CN102170304 A CN 102170304A
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Abstract
The invention provides an interference elimination method of multi-cell base station cooperation, belonging to the wireless information transmission field. When a user terminal located in the edge of the cell communicates with the target service base station thereof, the terminal causes interference to the base stations of the adjacent cells. In the invention, the service base station terminal is used to detect the user signal, and transmit the information bit to the interfered base station after demodulation and coding; and at the interfered base station terminal, the interference is rebuilt in accordance with the received user information bit flow, and is deleted from the received signal, after that, the information is recovered. Compared to the general base station cooperation method, by the interference elimination method of the invention, the transmission rate requirement between the cooperative base stations is reduced, and the system capacity is improved.
Description
Technical field
The invention belongs to the wireless messages transmission field, particularly adopt the system and the standard such as WLAN (wireless local area network), broadband wireless access, mobile communication, ground digital television broadcast of multi-antenna technology.
Background technology
Along with the fusion gradually of wireless network, multimedia technology and Internet, people are more and more higher to the requirement of the type of radio communication service and quality.For satisfying the requirement of radio multimedium and high speed data transfers, need the Development of New Generation wireless communication system, as 3G, LTE-Advanced etc.
Present 3G and LTE-Advanced system have adopted CDMA and OFDM technology respectively, can realize identical networking.They make the information-bearing of user in the sub-district on mutually orthogonal spreading code or orthogonal sub-carriers, can reduce the interference of the multiple access between the user in the sub-district greatly.But for Cell Edge User, useful signal intensity is little, and is big from the interference signal intensity of neighbor cell, this letter drying that has reduced Cell Edge User is than (SINR), cause its throughput to descend, make edge customer can not obtain satisfied service, seriously restricted systematic function.Therefore, presence of intercell interference suppresses to become problem demanding prompt solution in the mobile radio system.
From the interference mitigation technology based on the minizone cooperation, for a certain base station, strong jamming generally comes from adjacent base station.If can handle with causing strongly disturbing cell cooperative, with this part interference eliminated even be converted into useful signal, reduce interference signal intensity greatly, improve community marginal user performance.In the LTE-Advanced standard, multipoint cooperative transmission (CoMP) technology has been proposed.A CoMP cooperative cluster has comprised a plurality of base stations of diverse geographic location, shared channel and schedule information each other.The CoMP technology can improve the service quality and the throughput of Cell Edge User by cooperative scheduling and Combined Treatment.But mutual switching signal between the base station that CoMP need participate in cooperating, this requires the transmission rate between the base station very high, and the also demanding synchronization accuracy of the Combined Treatment between the base station, so also there is the difficult problem of Project Realization in it.For this reason, the present invention proposes a kind of base station collaboration treatment technology of low complex degree, and it can reduce presence of intercell interference, and has the advantage of the Project Realization of being easy to.
Summary of the invention
The object of the present invention is to provide a kind of presence of intercell interference delet method that is easy to Project Realization.
Thought of the present invention is: when the user terminal that is in cell edge was communicated by letter with its serving BS, this terminal can cause interference to the adjacent base station of serving BS; If the serving BS end can detect this subscriber signal, after demodulation, decoding, this information bit is transferred to adjacent disturbed base station; At disturbed base station end, rebuild according to the encoded modulation of the user profile bit stream that receives back and to disturb, and with restoring signal again behind this interference delete.
Particularly, the implementation step of method proposed by the invention is as follows, as shown in Figure 1.
The first step: user terminal is to the purpose serving BS pilot symbol transmitted of affiliated subdistrict; 101
Second step: the adjacent base station measurement pilot signals of serving BS if can correctly receive pilot signal, then is chosen to be disturbed base station to this base station; 102
The 3rd step: purpose base station and disturbed base station thereof calculate the user according to pilot signal---the channel condition information between the base station; 103
The 4th step: the purpose serving BS utilizes channel condition information to detect this subscriber signal, and obtains user's message bit stream after the demodulation, decoding; 104
The 5th step: purpose serving BS end utilizes wired or wireless network that the user profile bit is sent to disturbed base station end; 105
The 6th step: at disturbed base station end, the user's bit stream that receives is encoded, modulated and obtain interference signal, from its received signal, deduct interference signal, carry out the recovery operation of message bit stream again.106
Thus,, can improve the signal detection performance of disturbed base station end, and it only needs to flow to disturbed base station from serving BS transmission information bit by interference delete.And need the transmitted in both directions of the complex valued signals sample between serving BS and the disturbed base station in the general CoMP technology, so by comparison, the cooperation interference delete that the present invention proposes greatly reduces the requirement to transmission rate between the base station.
Description of drawings
Fig. 1 base station collaboration interference delete implementation step
Fig. 2 two area interference deletion example
Execution mode
Be the example explanation with two cell communication systems below, in described two cell communication systems, a base station is contained in every sub-district, as shown in Figure 2.User side UE1 communicates by letter with the base station node B1 that belongs to sub-district 1, and user side UE2 communicates by letter with the base station node B2 that belongs to sub-district 2.Simultaneously, the UE1 x1 that transmits can cause interference to the base station BS 2 of sub-district 2, and the UE2 x2 that transmits can cause interference to the base station BS 1 of sub-district 1.
Concrete steps are as follows:
The first step: the user UE1 that belongs to sub-district 1 is to base station node B1 emission pilot signal.
Second step: the adjacent base station Node B2 measurement pilot signals of base station node B1, if it can receive user side UE1 pilot transmitted signal, so elect disturbed base station as.
The 3rd step: purpose base station node B1 and disturbed base station node B2 thereof calculate the user respectively according to pilot signal---the channel condition information between the base station; 103.
The 4th step: at purpose base station BS 1 end, it recovers the transmission information bit s1 of UE1 from its received signal y1.
The 5th step: purpose base station BS 1 end utilizes transmission network that the information bit s1 of UE1 is sent to disturbed base station end BS2
The 6th step: at disturbed base station end BS2 end, earlier the transmission information bit s1 of UE1 is encoded, is modulated into the transmission signal x1 of UE1, promptly recover interference signal; Then, deduct interference (the transmission signal x1 of UE1) from BS2 termination collection of letters y2, i.e. (y2-x1) carries out the message bit stream s2 that demodulation, decoded operation recover UE2 to (y2-x1) again.
If adopt general base station collaboration to handle, be delivered to user side BS2 after need being quantified as data bit to user side BS1 received signal y1 (complex value), simultaneously, be delivered to BS1 after BS2 received signal y2 (complex value) is quantified as data bit.Then, BS1 and the BS2 signal processing of cooperating simultaneously synchronously.And in the base station collaboration that the present invention the proposes processing, only need exchange message bit stream between the base station, rather than the complex signal sample, this can reduce the expense of transmission network between the base station.
Can see, compare that the method that adopts the present invention to propose has following advantage: 1) reduced information bit mutual between the base station with original method; 2) need not between the base station synchronously.Therefore, institute's extracting method is easier to Project Realization.
The present invention is not only over against two cell communication systems, is higher than many sub-districts of 2 at number of cells and is suitable for too.
Claims (2)
1. multi-cell base station cooperation interference elimination method, it is characterized in that: the serving BS end detects the subscriber signal that communicates with, and after demodulation, decoding this message bit stream is transferred to disturbed base station; At disturbed base station end,, modulation back encoded according to the interference user message bit stream that receives rebuilds and disturbs, and recovers carrying out signal behind this interference delete again.
2. according to the method for claim 1, it is characterized in that: the implementation step of proposition method is as follows,
The first step: user terminal is to the purpose serving BS pilot signal transmitted of affiliated subdistrict;
Second step: the adjacent base station measurement pilot signals of serving BS if can correctly receive pilot signal, then is chosen to be disturbed base station to this base station;
The 3rd step: purpose base station, disturbed base station calculate the user according to pilot signal---the channel condition information between the base station;
The 4th step: the purpose base station utilizes the channel condition information value to detect subscriber signal, and through obtaining user's message bit stream after demodulation, the decoded operation;
The 5th step: purpose serving BS end is sent to disturbed base station end to the user profile bit by wired or wireless network;
The 6th step: disturbed base station end, the interference user bit stream that receives is encoded, modulated and obtain interference signal, from its received signal, deduct after this interference signal, carry out the recovery operation of message bit stream again.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103874074A (en) * | 2012-12-12 | 2014-06-18 | 华为技术有限公司 | Signal processing method and device thereof |
| CN105323766A (en) * | 2014-07-31 | 2016-02-10 | 中国移动通信集团公司 | Cell user processing method and device, and centralized ICIC (Inter-Cell Interference Coordination) equipment |
| CN105916168A (en) * | 2013-12-13 | 2016-08-31 | 华为技术有限公司 | Interference coordination method, device and system |
| US10305649B2 (en) | 2013-12-13 | 2019-05-28 | Huawei Technologies Co., Ltd. | Interference coordination method, apparatus, and system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101128056A (en) * | 2007-09-19 | 2008-02-20 | 中兴通讯股份有限公司 | A method for interference elimination between cooperative cells |
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2011
- 2011-05-25 CN CN2011101366420A patent/CN102170304A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101128056A (en) * | 2007-09-19 | 2008-02-20 | 中兴通讯股份有限公司 | A method for interference elimination between cooperative cells |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103874074A (en) * | 2012-12-12 | 2014-06-18 | 华为技术有限公司 | Signal processing method and device thereof |
| WO2014090177A1 (en) * | 2012-12-12 | 2014-06-19 | 华为技术有限公司 | Signal processing method and apparatus |
| CN103874074B (en) * | 2012-12-12 | 2017-04-12 | 华为技术有限公司 | Signal processing method and device thereof |
| CN105916168A (en) * | 2013-12-13 | 2016-08-31 | 华为技术有限公司 | Interference coordination method, device and system |
| CN105916168B (en) * | 2013-12-13 | 2019-05-21 | 华为技术有限公司 | Disturbance coordination method, device and system |
| US10305649B2 (en) | 2013-12-13 | 2019-05-28 | Huawei Technologies Co., Ltd. | Interference coordination method, apparatus, and system |
| CN105323766A (en) * | 2014-07-31 | 2016-02-10 | 中国移动通信集团公司 | Cell user processing method and device, and centralized ICIC (Inter-Cell Interference Coordination) equipment |
| CN105323766B (en) * | 2014-07-31 | 2018-12-18 | 中国移动通信集团公司 | A kind of community user processing method, device and centralization ICIC equipment |
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Application publication date: 20110831 |