CN101286786B - Method for inhibiting interference during identical networking by scheduling - Google Patents
Method for inhibiting interference during identical networking by scheduling Download PDFInfo
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- CN101286786B CN101286786B CN 200710090573 CN200710090573A CN101286786B CN 101286786 B CN101286786 B CN 101286786B CN 200710090573 CN200710090573 CN 200710090573 CN 200710090573 A CN200710090573 A CN 200710090573A CN 101286786 B CN101286786 B CN 101286786B
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- H04W72/12—Wireless traffic scheduling
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Abstract
The invention discloses a method for restraining the interferences of group networks with the same frequency by modulating. The method comprises the steps that potential interference conditions of each user in a local cell to other cells are obtained by each cell; ordering or classification is carried out to the users by each cell according to the potential interference conditions; modulation is carried out to each cell according to the ordering or the classification to crossly distribute the users with high potential interference conditions in the time-frequency resource space of the same system of the local cell and other cells. The method provided by the invention can effectively reduce the interference of the same frequency in a wireless communication system and improve frequency spectrum efficiency, thereby further increasing the coverage and the flow 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 frequently interference, the outer interference of band, Intermodulation Interference etc.Wherein the co-channel interference of system refers to some or all of residential quarter in the network owing to use identical frequency to carry out transfer of data, has mutual signal between the residential quarter 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 residential quarter, presence of intercell interference, the different communication standard cause etc.
Interference in the residential quarter 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 the 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.
Presence of intercell interference inter-cell interference is called for short ICI, is an intrinsic problem of cell mobile communication systems, and traditional solution is that proportion is multiplexing, and common multiplexing coefficient is 1,3,7 etc.Multiplexing coefficient is 1 to represent that namely 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 comprises interference randomization, interference coordination, interference elimination etc. at present.
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, can with signal demodulation, the decoding of interfered cell, then will copy from the ICI of this residential quarter, deduct.ICI technology for eliminating based on IDMA, refer to produce different interlacing patterns and distribute to different residential quarters by pseudo random interleaver, receiver adopts different interlacing pattern deinterleavings, just echo signal and interference signal can be solved respectively, then carries out ICI and eliminates.This technology and iterative receiver machine 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 again " soft-frequency reuse " or " partial frequency multiplexing ", 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 to adopt higher power sending and receiving, might cause stronger ICI, therefore is dispensed on the multiplexing collection that frequency reuse is N.
Other technology, such as 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, may further comprise the steps:
1.1) each residential quarter obtains in this residential quarter each user to the potential interference situation of other residential quarters;
1.2) each residential quarter sorts to the user based on described potential interference situation or classify, classification can be further according to the division of a ci poem value of setting the user to be classified after the ordering;
1.3) according to described ordering or classification each residential quarter is dispatched and to make the high user of described potential interference situation staggered distribution in the same system running time-frequency resource space of this residential quarter and other residential quarters, namely to the user that mutually has potential interference staggered distribution in the same system running time-frequency resource space of residential quarter separately.
According to method provided by the invention, the described interference power and the schedule information that include, but are not limited to gather according to transmitting power or link-quality or link rate or main control module each residential quarter obtained obtained.
According to method provided by the invention, described classification comprises interference user and non-interference user.
According to method provided by the invention, the described non-interference user of this residential quarter and other residential quarters can take same system time frequency resource space, and the described interference user of this residential quarter and other residential quarters is cut apart and taken remaining system running time-frequency resource space.
According to method provided by the invention, comprise average time domain or Dividing in frequency domain described cutting apart.
According to method provided by the invention, the described non-interference user of this residential quarter and other residential quarters also can interlock and take different masses system time frequency resource space, and the described interference user in this residential quarter can take with the described non-interference user of other residential quarters same system time frequency resource space.
According to method provided by the invention, described ordering is from high to low, this residential quarter and other residential quarters take whole system time frequency resources space, and described staggered distribution is that this residential quarter is different with the initial position of other residential quarters when physical layer is shone upon, and described physical layer mapping is carried out in order.
According to method provided by the invention, described initial position asynchronism(-nization), described physical layer mapping is carried out in chronological order, and perhaps described initial position frequency is different, and described physical layer mapping is undertaken by frequency order.
According to method provided by the invention, time domain or the frequency domain in minute system time frequency resource space such as described initial position.
According to method provided by the invention, described system time frequency resource space can be OFDMA system wireless interface physics hardwood.
The invention provides a kind of wireless communication system and disturb the method that suppresses, the method can effectively overcome the minizone co-channel interference, and receptivity, the increase residential quarter 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 disturb to suppress scheduling mode one.
Fig. 4 be the embodiment of the invention described be the schematic diagram that disturb to suppress scheduling mode two.
Fig. 5 be the embodiment of the invention described be the schematic diagram that disturb to suppress scheduling mode three.
Fig. 6 be the embodiment of the invention described be the schematic diagram that disturb to suppress scheduling mode four.
Fig. 7 be the embodiment of the invention described be the schematic diagram that disturb to suppress scheduling mode five.
Fig. 8 be the embodiment of the invention described be the schematic diagram that disturb to suppress scheduling mode six.
Embodiment
At first, a kind of core of carrying out the method for identical networking interference inhibition by scheduling of the present invention is described: 1. classify to the potential interference situation of other residential quarters according to user in the residential quarter or sort in each residential quarter; 2. dispatch based on user's classification or ordering each residential quarter, reaches the purpose that suppresses or eliminate co-channel interference.
The second, specify the present invention:
(1) described disturbance restraining method is applied to a wireless communication system, specifically 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 at least a terminal of communicating by letter with this cell base station in each residential quarter
The frequency of (3) two adjacent base stations is disposed identical, has co-channel interference between neighbor cell.
(2) disturbance restraining method of the present patent application comprises following process:
(1) classify to the potential interference situation of other residential quarters according to user in the residential quarter or sort in each residential quarter;
(2) dispatch based on classification or ordering user each residential quarter, reaches the purpose that suppresses or eliminate co-channel interference.
The 3rd step, the present invention is mainly 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.The drawback that the present invention exists in order to solve conventional solution, 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.
(1) as shown in Figure 1, two residential quarters 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 residential quarter, generally can carry out transfer of data with larger 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 on SS1 and SS3 are dispensed on respectively the uplink burst 1 of BS1 and BS2, carrying out transfer of data, 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.Covering and the flow of whole system have finally been reduced.
(2) take the OFDMA system as example, by reference to the accompanying drawings the enforcement of technical scheme is described in further detail below, 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 residential quarter;
(3) classify to the potential interference situation of other residential quarters according to user in the residential quarter or sort in each residential quarter;
Can weigh this community user to the potential interference situation of other residential quarters with following index:
A) each user's of this residential quarter average transmit power
B) each user's of this residential quarter average link quality indication is such as SNR, RSSI, CINR etc.
C) each user's of this residential quarter average link speed indication is such as DIUC, UIUC, TFI etc.
D) gather interference power and the schedule information of each residential quarter by main control module, adjudicate each user's disturbed condition, the Chinese invention patent application " a kind of co-channel interference inhibition method of wireless communication system " that concrete grammar can adopt the applicant to propose simultaneously.
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 first with the user according to the ordering of other area interference size, then be divided into two classes take certain threshold value as boundary, for example be divided into interference user and non-interference user; The interference user of mentioning in the present specification refers to produce to other community users the user of larger interference; Non-interference user refers to unlikely other community users be produced the user of larger interference.
(4) then the classification of each residential quarter after based on user classification or ordering dispatched, and reaches the purpose that suppresses or eliminate co-channel interference.
The principle of scheduling can be following mode:
Method one:
As shown in Figure 3, the frame of three subgraph difference three adjacent cells/sectors i of corresponding same time among the figure.The frame of each cell/section 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 residential quarter 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 residential quarter, to improve bandwidth efficiency when the interference user load is less.
Method two:
As shown in Figure 4, the frame of three subgraph difference three adjacent cells/sectors i of corresponding same time among the figure.The frame of each cell/section 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 residential quarter 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 residential quarter, to improve bandwidth efficiency when the interference user load is less.
Method three:
As shown in Figure 5, the frame of three subgraph difference three adjacent cells/sectors i of corresponding same time among the figure.The frame of each cell/section 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 residential quarter may produce between the user of larger interference can not produce interference, and the interference user of cell i only may be scheduled at same time with the non-interference user of residential quarter 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:
As shown in Figure 6, 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 residential quarter all takies whole bandwidth.When the actual physics layer shone upon, the initial time position that different districts shines upon in frame was different, and 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 message expense of region description.Reach bandwidth availability ratio and the interference suppressioning effect identical with method three in mode more flexibly.
Method five: similar with the thinking of method three as shown in Figure 7, 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 as shown in Figure 8, 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; in the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art can make according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1. a method of carrying out identical networking interference inhibition by scheduling is characterized in that, may further comprise the steps:
1.1) each residential quarter obtains in this residential quarter each user to the potential interference situation of other residential quarters;
1.2) each residential quarter sorts to the user based on described potential interference situation or classify;
1.3) according to described ordering or classification each residential quarter is dispatched and to make the high user of described potential interference situation staggered distribution in the same system running time-frequency resource space of this residential quarter and other residential quarters.
2. described method according to claim 1 is characterized in that, described obtaining comprises that the interference power and the schedule information that gather each residential quarter according to transmitting power or link-quality or link rate or main control module obtain.
3. described method according to claim 1 is characterized in that described classification comprises interference user and non-interference user.
4. described method according to claim 3 is characterized in that, the described non-interference user of this residential quarter and other residential quarters takies same system time frequency resource space, and the described interference user of this residential quarter and other residential quarters is cut apart and taken remaining system running time-frequency resource space.
5. described method according to claim 4 is characterized in that comprise average time domain or Dividing in frequency domain described cutting apart.
6. described method according to claim 3, it is characterized in that, the described non-interference user of this residential quarter and other residential quarters is staggered to take different masses system time frequency resource space, and the described non-interference user of the described interference user in this residential quarter and other residential quarters takies same system time frequency resource space.
7. described method according to claim 1, it is characterized in that, described ordering is from high to low, this residential quarter and other residential quarters take whole system time frequency resources space, described staggered distribution is that this residential quarter is different with the initial position of other residential quarters when physical layer is shone upon, and described physical layer mapping is carried out in order.
8. described method according to claim 7 is characterized in that, described initial position asynchronism(-nization), and described physical layer mapping is carried out in chronological order, and perhaps described initial position frequency is different, and described physical layer mapping is undertaken by frequency order.
9. described method according to claim 8 is characterized in that, time domain or the frequency domain in minute system time frequency resource space such as described initial position.
10. each described method is characterized in that according to claim 1-9, and described system time frequency resource space is OFDMA system wireless interface physical frame.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN 200710090573 CN101286786B (en) | 2007-04-11 | 2007-04-11 | Method for inhibiting interference during identical networking by scheduling |
| PCT/CN2007/003418 WO2008124983A1 (en) | 2007-04-11 | 2007-12-03 | Method for restraining same-frequency-interference by scheduling in network-organizing |
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| CN 200710090573 CN101286786B (en) | 2007-04-11 | 2007-04-11 | Method for inhibiting interference during identical networking by scheduling |
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| CN101286786A CN101286786A (en) | 2008-10-15 |
| CN101286786B true CN101286786B (en) | 2013-03-20 |
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Families Citing this family (16)
| 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 |
| CN104918332A (en) | 2009-02-02 | 2015-09-16 | 三菱电机株式会社 | Mobile communication system |
| CN101877853B (en) * | 2009-04-28 | 2013-03-06 | 鼎桥通信技术有限公司 | Method for reducing same frequency interferences |
| CN101877854B (en) * | 2009-04-28 | 2013-01-16 | 鼎桥通信技术有限公司 | Method for reducing same frequency interferences |
| CN102014507B (en) * | 2009-09-04 | 2013-03-27 | 普天信息技术研究院有限公司 | User uplink resource scheduling method in HSUPA system |
| CN102918907B (en) * | 2010-05-28 | 2015-06-17 | 日本电气株式会社 | Wireless resource setting method, wireless communication system and wireless base state |
| CN101951644B (en) * | 2010-09-29 | 2013-08-07 | 华为技术有限公司 | Method and device for reducing interferences |
| GB2485387B (en) * | 2010-11-12 | 2013-10-02 | Intellectual Ventures Holding 81 Llc | Wireless communication system, communication unit, and method for scheduling |
| CN102480774B (en) * | 2010-11-29 | 2015-03-11 | 华为技术有限公司 | Method for eliminating system interference, apparatus thereof, and terminal thereof |
| CN102655681B (en) * | 2011-03-01 | 2014-09-03 | 普天信息技术研究院有限公司 | Scheduling method |
| CN102685756B (en) * | 2011-03-11 | 2014-12-03 | 鼎桥通信技术有限公司 | Method for reducing same frequency interference of high speed downlink packet access (HSDPA) users |
| CN102223679A (en) * | 2011-07-12 | 2011-10-19 | 电信科学技术研究院 | Method and equipment for processing load congestion |
| CN102595417B (en) * | 2012-02-22 | 2015-06-24 | 电信科学技术研究院 | Planning method and system for community resources |
| WO2014101236A1 (en) * | 2012-12-31 | 2014-07-03 | 华为技术有限公司 | Uplink channel interference coordinating method and base station |
| CN106604300B (en) * | 2016-11-10 | 2020-01-10 | 北京邮电大学 | Small cell base station self-energy supply and self-return method based on full duplex and large-scale antenna technology |
| CN107733456B (en) * | 2017-11-08 | 2020-09-01 | 河海大学常州校区 | Method for reducing computation complexity and serial interference elimination detection receiver |
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- 2007-04-11 CN CN 200710090573 patent/CN101286786B/en not_active Expired - Fee Related
- 2007-12-03 WO PCT/CN2007/003418 patent/WO2008124983A1/en active Application Filing
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| CN1753322A (en) * | 2004-09-24 | 2006-03-29 | 大唐移动通信设备有限公司 | Multi region combined detection method of time gap code division multi address system |
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| CN1917378A (en) * | 2005-08-18 | 2007-02-21 | 财团法人资讯工业策进会 | Method for restraining same frequency interference in wireless communication system |
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| WO2008124983A1 (en) | 2008-10-23 |
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