CN101282161A - Method for interference suppression of idem frequency group network through scheduling - Google Patents
Method for interference suppression of idem frequency group network through scheduling Download PDFInfo
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- CN101282161A CN101282161A CNA2007100962321A CN200710096232A CN101282161A CN 101282161 A CN101282161 A CN 101282161A CN A2007100962321 A CNA2007100962321 A CN A2007100962321A CN 200710096232 A CN200710096232 A CN 200710096232A CN 101282161 A CN101282161 A CN 101282161A
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Abstract
The present invention discloses a method for suppressing the interference of co-frequency network through scheduling. The method comprises the following steps: firstly sorting or ranking by each cell according to the latent interference state of the subscriber in the cell to other cell; and then scheduling by each cell according to the sorting and ranking of the subscriber to obtain the purposes of suppression or elimination to the co-channel interference. The method provided by the invention can effectively reduce the co-channel interference in a wireless communication system and increases the efficiency of frequency spectrum thereby further increasing the coverage and flow capacity of the system.
Description
Technical field
The present invention relates to a kind of co-channel interference inhibition method of wireless communication system, particularly the co-channel interference inhibition method in the ofdm system.
Background technology
Wireless and interference mobile communication system mainly contains co-channel interference, adjacent interference frequently, the outer interference of band, Intermodulation Interference etc.Wherein the co-channel interference of system is meant some or all of sub-district in the network owing to use identical frequency to carry out transfer of data, has mutual signal between the sub-district and disturbs.Co-channel interference generally can be divided into interference that interference, the interference between the different operators, system equipment between interference in the sub-district, presence of intercell interference, the different communication standard cause etc.
Interference in the sub-district mainly contains multipath interference, near-far interference and multiple access interference etc.The generation of these interference is to be determined by characteristics such as time delay in the time variation of wireless channel and the electromagnetic wave propagation process and declines.Can alleviate by modulation-demodulation technique, power control technology etc.
(inter-cell interference ICI) is an intrinsic problem of cell mobile communication systems to presence of intercell interference, and traditional solution is to adopt channeling, and common multiplexing coefficient is 1,3,7 etc.Multiplexing coefficient is 1 to represent that promptly neighbor cell all uses identical frequency resource, at this moment disturbs very serious at cell edge.Higher multiplexing coefficient (3 or 7) can suppress ICI effectively, but spectrum efficiency will be reduced to 1/3 or 1/7.
Mobile radio system is more and more higher to the requirement of spectrum efficiency, and expectation can be carried out identical networking and improve system effectiveness.But when identical networking, if can not effectively solve the problem of co-channel interference of minizone, will reduce system spectrum efficiency, reduce that system covers, the loss system flow.
Interference mitigation technology commonly used at present comprises interference randomization, interference coordination, interference eliminated etc.
Interference randomization can not reduce the energy of interference, but can be " white noise " with interference randomization, thereby suppresses the harm of ICI, therefore is called again " interference whitening ".The method of interference randomization comprises: scrambling, interlacing multi-address (IDMA) and frequency hopping etc.
Interference cancellation techniques derives from multiuser detection, signal demodulation, the decoding of interfered cell will can be duplicated from the ICI of this sub-district, be deducted then.ICI technology for eliminating based on IDMA, be meant by pseudo random interleaver and produce different interlacing patterns and distribute to different sub-districts, receiver adopts different interlacing pattern deinterleavings, just echo signal and interference signal can be solved respectively, carries out ICI then and eliminates.This technology and iterative receiver technology combine, and can obtain significant performance gain.ICI eliminates and to coordinate comparing advantage with ICI and be, to the frequency resource of cell edge without limits, can realize the cell edge spectrum efficiency be 1 and total frequency spectrum efficient be 1.But computation complexity is higher, has increased the requirement to the receiver disposal ability.
Interference coordination is called " soft-frequency reuse " or " partial frequency multiplexing " again, and IEEE802.20MBFDD/MBTDD has just adopted this technology, and LTE is also considering this method.Therefore this method is divided into several multiplexing collection with frequency resource, and the user of center of housing estate can adopt lower power emission and reception, also can not cause stronger ICI even take identical frequency, is dispensed on multiplexing coefficient and is 1 multiplexing collection; The user of cell edge need adopt higher power to send and receive, and might cause stronger ICI, therefore is dispensed on the multiplexing collection that frequency reuse is N.
Other technology, for example MIMO, smart antenna, part power control etc. also can be used for ICI and suppress.
Therefore, how to improve the spectrum efficiency of mobile radio system, the interference problem that the solution identical networking exists, become present problem demanding prompt solution.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of and carries out the method that identical networking disturbs inhibition by scheduling, solves the spectrum efficiency that how to improve mobile radio system in the prior art, the interference problem that solves the identical networking existence.
For solving the problems of the technologies described above, the present invention proposes a kind of method of carrying out identical networking interference inhibition by scheduling, it is characterized in that, may further comprise the steps:
(1) classify to the potential disturbed condition of other sub-districts according to user in the sub-district or sort in each sub-district;
(2) dispatch based on user's classification or ordering each sub-district, reaches the purpose that suppresses or eliminate co-channel interference.
The described disturbance restraining method of this patent is applied to a wireless communication system, comprises following components:
(1) at least two base station, each base station sends the control information (comprising schedule information) in the respective cell scope
(2) there is a terminal of communicating by letter in each sub-district at least with this cell base station
The frequency of (3) two adjacent base stations is disposed identical, has co-channel interference between neighbor cell.
The described disturbance restraining method of this patent comprises following process:
(1) classify to the potential disturbed condition of other sub-districts according to user in the sub-district or sort in each sub-district;
(2) dispatch based on classification or ordering user each sub-district, reaches the purpose that suppresses or eliminate co-channel interference.
The invention provides a kind of wireless communication system and disturb the method that suppresses, this method can effectively overcome the minizone co-channel interference, and receptivity, the increase sub-district of improving edge customer cover, improve flow system flow and spectrum efficiency.
Description of drawings
Fig. 1 is the network configuration in the typical mobile radio system described in the prior art, when identical networking, can produce more serious presence of intercell interference;
Fig. 2 is respectively the OFDMA system-frame scheduling schematic diagram that BS1 and BS2 carve at a time;
Fig. 3 be the embodiment of the invention described be the schematic diagram that various interference suppress scheduling modes.
Embodiment
The present invention is in order to solve the drawback that conventional solution exists, further set forth a kind of method of carrying out identical networking interference inhibition by scheduling of the present invention by following specific embodiment, below embodiment is described in detail, but not as a limitation of the invention.
The present invention is primarily aimed in wireless communication system, because the systematic function decline problem that presence of intercell interference causes during identical networking, propose to disturb the relevant solution that suppresses, be intended to by effective interference mitigation technology, reduce the spectrum efficiency of presence of intercell interference, increase covering and flow, raising system.
As shown in Figure 1, two sub-districts of base station BS 1 and BS2 control are adjacent.Terminal SS1 and SS2 are positioned at the coverage of BS1; Terminal SS3 and SS4 are positioned at the coverage of BS2.SS1 and SS3 are in the marginal position of sub-district, generally can carry out transfer of data with bigger uplink transmission power.When identical networking, can produce more serious presence of intercell interference.
As shown in Figure 2, suppose that BS1 and BS2 are identical networking among the figure.When SS1 and SS3 are dispensed on the enterprising line data transmission of the uplink burst 1 of BS1 and BS2 respectively, because the time-frequency region of these two bursts has intersection, then the upward signal of two SS receiving in this position of two BS can disturb each other, cause received signal to noise ratio to reduce, thereby increase the error rate, reduce efficiency of transmission, even cause call drop.The covering and the flow of whole system have finally been reduced.
Be example with the OFDMA system below, the enforcement to technical scheme is described in further detail in conjunction with the accompanying drawings, and basic performing step is as follows:
(1) each cell base station sends the control information (comprising schedule information) of descending and up link;
(2) each cell base station receives the upstream data of counterpart terminal in this sub-district;
(3) classify to the potential disturbed condition of other sub-districts according to user in the sub-district or sort in each sub-district;
Can use following index to weigh the potential disturbed condition of this community user to other sub-districts:
A) each user's of this sub-district average transmit power
B) each user's of this sub-district average link quality indication is as SNR, RSSI, CINR etc.
C) each user's of this sub-district average link speed indication is as DIUC, UIUC, TFI etc.
D) gather the interference power and the schedule information of each sub-district by main control module, adjudicate each user's disturbed condition
User's classification can be following mode:
Method one: the user according to other area interference size cases are divided into two classes, for example is divided into interference user and non-interference user.
Method two: perhaps elder generation according to other area interference size orderings, being that boundary is divided into two classes with certain threshold value, for example is divided into interference user and non-interference user with the user then.
(note: the interference user of mentioning herein refers to produce the user of larger interference to other community users; Non-interference user refers to unlikely other community users be produced the user of larger interference)
(4) classification of each sub-district after based on user classification or ordering dispatched then, reaches the purpose that suppresses or eliminate co-channel interference.
The principle of scheduling can be following mode:
Method one:
As shown in Figure 3A, the frame of three subgraph difference three adjacent cells/sectors i of corresponding same time among the figure.The frame of each cell/section all has been divided into regional zonei1 and the zonei2 of two time-divisions, wherein the zonei1 frequency division of different districts/sector.
In scheduling process, the interference user of cell i is distributed in regional zonei1, non-interference user is distributed in regional zonei2.Like this when identical networking, because the zonei1 frequency division of different districts/sector, can guarantee then that each sub-district may produce between the user of larger interference can not produce interference, disturb the purpose that suppresses thereby reach.The user who is assigned with among the Zonei2 is for unlikely producing the user of larger interference, so this zone occupies whole bandwidth, and the frequency reuse in this distribution time is 1, can improve the bandwidth efficiency of system.
The size in zone is divided and can be adjusted according to the interference user loading condition self adaptation of each sub-district, to improve bandwidth efficiency in the interference user load more after a little while.
Method two:
Shown in Fig. 3 B, the frame of three subgraph difference three adjacent cells/sectors i of corresponding same time among the figure.The frame of each cell/section all has been divided into regional zonei1 and the zonei2 of two time-divisions, wherein the zonei1 time-division of different districts/sector.
In scheduling process, the interference user of cell i is distributed in regional zonei1, non-interference user is distributed in regional zonei2.Like this when identical networking, because the zonei1 time-division of different districts/sector, can guarantee then that each sub-district may produce between the user of larger interference can not produce interference, disturb the purpose that suppresses thereby reach.The user who is assigned with among the Zonei2 is for unlikely producing the user of larger interference, so this zone occupies whole bandwidth, and the frequency reuse in this distribution time is 1, can improve the bandwidth efficiency of system.
The size in zone is divided and can be adjusted according to the interference user loading condition self adaptation of each sub-district, to improve bandwidth efficiency in the interference user load more after a little while.
Method three:
Shown in Fig. 3 C, the frame of three subgraph difference three adjacent cells/sectors i of corresponding same time among the figure.The frame of each cell/section all has been divided into regional zonei1 and the zonei2 of two time-divisions, wherein the zonei1 time-division of different districts/sector.
In scheduling process, the interference user of cell i is distributed in regional zonei1, non-interference user is distributed in regional zonei2.Like this when identical networking, because the zonei1 time-division of different districts/sector, can guarantee then that each sub-district may produce between the user of larger interference can not produce interference, and the interference user of cell i only may be scheduled in the identical time with the non-interference user of sub-district j.So both reached and disturbed the purpose that suppresses, guaranteed again that the channeling in all transmission times of system all was 1, further improved bandwidth availability ratio.
Method four:
Shown in Fig. 3 D, the frame of three subgraph difference three adjacent cells/sectors i of corresponding same time among the figure.The frame of each cell/section is no longer divided fixing zone.
Before the scheduling, the user is sorted according to disturbed condition.In scheduling process, dispatched users in order, the distribution of each sub-district all takies whole bandwidth.When the actual physics layer shines upon, the initial time position difference that different districts shines upon in frame, when mapping reached frame end, the frame head that reverses back again shone upon, and guaranteed to distribute finally to take whole frame length.
Suppose to be spaced apart frame length/n between the initial time position of different districts physical layer mapping, can guarantee then that the minizone takies between the maximum interference user of frame length/n can not interact.This method does not need the zoning, has reduced the control messages expense of region description.Reach bandwidth availability ratio and the interference suppressioning effect identical with flexible way more with method three.
Method five: similar with the thinking of method three shown in Fig. 3 E, just the time-division with interference user becomes the frequency division relation, can reach identical effect.
Method six: similar with the thinking of method four shown in Fig. 3 F, just the time-division with interference user becomes the frequency division relation, and time offset becomes frequency offset, also can reach identical effect.
Method seven: user's disturbed condition can also be required to sort in conjunction with Qos, then according to top method scheduling.
Certainly; 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 (1)
1. a method of carrying out identical networking interference inhibition by scheduling is characterized in that, may further comprise the steps:
(1) classify to the potential disturbed condition of other sub-districts according to user in the sub-district or sort in each sub-district;
(2) dispatch based on user's classification or ordering each sub-district, reaches the purpose that suppresses or eliminate co-channel interference.
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| CNA2007100962321A CN101282161A (en) | 2007-04-03 | 2007-04-03 | Method for interference suppression of idem frequency group network through scheduling |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010083735A1 (en) * | 2009-01-23 | 2010-07-29 | 华为技术有限公司 | Adjustment method, system and micro base station configuration center for data frame between micro base station and macro base station |
| WO2012028037A1 (en) * | 2010-09-04 | 2012-03-08 | Huawei Technologies Co., Ltd. | Method and apparatus of communications |
| CN101707779B (en) * | 2009-11-23 | 2012-05-23 | 上海华为技术有限公司 | Resource allocation method, access network equipment and communication system |
| CN103428872A (en) * | 2012-05-15 | 2013-12-04 | 马维尔国际有限公司 | Method and apparatus for eliminating co-channel interference |
| US8843148B2 (en) | 2010-09-04 | 2014-09-23 | Huawei Technologies Co., Ltd. | Method and apparatus of communications |
| WO2021090074A1 (en) | 2019-11-05 | 2021-05-14 | Telefonaktiebolaget Lm Ericsson (Publ) | Pre-emptive suppression of inter-cell interference in cellular wireless communication networks |
-
2007
- 2007-04-03 CN CNA2007100962321A patent/CN101282161A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010083735A1 (en) * | 2009-01-23 | 2010-07-29 | 华为技术有限公司 | Adjustment method, system and micro base station configuration center for data frame between micro base station and macro base station |
| CN101707779B (en) * | 2009-11-23 | 2012-05-23 | 上海华为技术有限公司 | Resource allocation method, access network equipment and communication system |
| WO2012028037A1 (en) * | 2010-09-04 | 2012-03-08 | Huawei Technologies Co., Ltd. | Method and apparatus of communications |
| US8843148B2 (en) | 2010-09-04 | 2014-09-23 | Huawei Technologies Co., Ltd. | Method and apparatus of communications |
| CN103428872A (en) * | 2012-05-15 | 2013-12-04 | 马维尔国际有限公司 | Method and apparatus for eliminating co-channel interference |
| WO2021090074A1 (en) | 2019-11-05 | 2021-05-14 | Telefonaktiebolaget Lm Ericsson (Publ) | Pre-emptive suppression of inter-cell interference in cellular wireless communication networks |
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