CN1881867A - Method for eliminating interference between cells - Google Patents
Method for eliminating interference between cells Download PDFInfo
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- CN1881867A CN1881867A CN 200510077609 CN200510077609A CN1881867A CN 1881867 A CN1881867 A CN 1881867A CN 200510077609 CN200510077609 CN 200510077609 CN 200510077609 A CN200510077609 A CN 200510077609A CN 1881867 A CN1881867 A CN 1881867A
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Abstract
The invention relates to a method for eliminating inter-region interference, which comprises: the user terminal builds the connection with at least one nearby base station, and transmits itself time frequency resource information via the local base station to the connected nearby base station; said nearby base station receives the time frequency resource information and distributes the time frequency resource different with the user terminal to the itself managed user; if the resource is not enough, the nearby base station distributes the same time frequency resource to itself managed user, and sends the interference user modulate code method with same time frequency resource to the user terminal; the user terminal, based on said modulate code method, separates the interference user signal from the received signal. The invention, via distributing the non-interference time frequency resource and sending the interference user modulate code information can eliminate the interference of nearby region user on the local user.
Description
Technical field
The present invention relates to mobile communication technology, refer to a kind of method of eliminating presence of intercell interference especially.
Background technology
Along with the development of mobile communication technology, organizing of formulation wireless communication standards such as 3GPP considered to include OFDM (OFDM) technology in the next generation wireless communication system.The employing orthogonal frequency division multiplexi can make the user's service signal each other that belongs to same sub-district keep quadrature, thereby avoids user's phase mutual interference of same sub-district, guarantees the accuracy of service signal transmitting-receiving.But the OFDM technology but can't be eliminated the interference of the neighbor cell user of interference, especially certain sub-district between the neighbor cell user to this cell boundary users.Wherein, the neighbor cell of certain sub-district is meant sub-district close with this sub-district on the geographical position.As shown in Figure 1, sub-district A, B, C, D, E and F are the neighbor cells of sub-district 1.For the user of sub-district 1, the base station in this sub-district is called home base stations, and the base station in the neighbor cell is called adjacent base station.
For solving problem of inter-cell interference, 3GPP WG1 R1-050401 motion provides a kind of method: for distributing different modulation coding modes owing to the identical running time-frequency resource of use causes the different user of phase mutual interference in the neighbor cell, so that user terminal utilizes multi-user's iterative receiver that the service signal of different user is carried out demodulation, separation, eliminate the interference of adopting between the identical running time-frequency resource user.
Described identical running time-frequency resource is meant: period and frequency range that telex network takies overlap fully.
Described different modulation coding mode is meant: adopt different scrambling codes to carry out scrambling to transmitting, or adopt interlacing multi-address method that different chnnel codings and deinterleaving method for example propose among the 3GPP WG1 R1-050401 etc.
This method that 3GPP WG1 R1-050401 motion provides is when overcoming presence of intercell interference, need be that different districts adopts the user of identical running time-frequency resource to distribute different modulation coding modes by the combined dispatching between the base station, and allocation result notified mutually, by home base stations neighbor cell interference user's modulation coding information is handed down to the user who adopts identical running time-frequency resource in the current area again.Described user can utilize multi-user's iteration reception technique to isolate neighbor cell user's interference signal after receiving modulation coding information, improves the accuracy that service signal receives.
Yet in actual applications, for adapting to the communication environment of continuous variation, the modulation coding mode that the user adopts can change continually, and this just needs frequently to communicate by letter between the base station and coordinates, but this coordinating communication is difficult to guarantee real-time, realizes difficulty.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method of eliminating presence of intercell interference, to eliminate the neighbor cell user's that certain community user is subjected to interference.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
A kind of method of eliminating presence of intercell interference is characterized in that, this method may further comprise the steps:
A, user terminal and at least one adjacent base station connect, and by home base stations the running time-frequency resource information of self using are sent to the adjacent base station that connects;
After b, the adjacent base station that connects with the described user terminal of step a are received described running time-frequency resource information, give self user that administers of institute distribution and the different running time-frequency resource of the described user terminal of step a.
Further, the method that connects with at least one adjacent base station described in the step a is:
The signal message of a1, user terminal measurement different base station, and measured value compared with the thresholding of communicating by letter that sets in advance;
The base station information that a2, user terminal will arrive the communication thresholding reports home base stations, being connected between the base station of being set up described arrival communication thresholding by home base stations and the user terminal.
Preferably, the described signal message of step a1 is signal strength signal intensity or signal to noise ratio.
Further, step b further comprises: adjacent base station is judged the whether success of distribution of running time-frequency resource, if success then finish this interference cancellation process; Otherwise execution following steps:
B1, described adjacent base station are given the user who self administers with the identical time-frequency resource allocating that the described user terminal of step a uses, and by using the modulation coding mode of the interference user of identical running time-frequency resource to send to the described user terminal of step a with the connection that the described user terminal of step a is set up;
The described user terminal of b2, step a is isolated the interference user signal according to the modulation coding mode of interference user from the signal that receives, obtain the service signal that home base stations sends.
Further, when the success of the time-frequency resource allocating of adjacent base station, before finishing this interference cancellation process, this method further comprises: adjacent base station sends noiseless user notification to the described user terminal of step a.
Further, among the step b1, adjacent base station sends the modulation coding mode of an interference user to user terminal at each Transmission Time Interval.
Further, the method for isolating the interference user signal among the step b2 from the signal that receives is:
B21, according to the modulation coding mode of interference user, separate to the received signal and be in harmonious proportion decoding, obtain the decoded signal of interference user;
B22, decoded signal is encoded and modulated, obtain transmitting of interference user;
B23, from the signal that receives, deduct transmitting of step interference user that b22 obtains, realize the separation of interference user signal.
Preferably, the method for the described separation interference user of step b2 signal is realized by multi-user's iterative receiver.
Preferably, described modulation coding mode comprise scrambler, chnnel coding and the three kinds of modes that interweave at least a mode.
As seen from the above technical solution, the method of this elimination presence of intercell interference of the present invention, select to connect by fast cell by user terminal with at least one base station, the running time-frequency resource information of self is reported adjacent base station by home base stations, when adjacent base station distributes running time-frequency resource for the compass of competency user, time-frequency resource allocating that will be identical with this user terminal uses for the compass of competency user, to avoid occurring in the compass of competency interference user of described user terminal.
When the customer volume of adjacent base station is big, adjacent base station is when distributing identical running time-frequency resource with this user terminal, by and this user terminal between the control channel modulation coding information that directly issues interference user give described user terminal, make this class user can utilize the modulation coding information of the interference user that receives to carry out interference eliminated, thereby eliminate the interference that this class user is subjected to effectively.
Description of drawings
Fig. 1 concerns schematic diagram for the position that certain sub-district in the prior art is adjacent the sub-district;
Fig. 2 is for being in the annexation schematic diagram of fast cell selection mode user and two base stations in a preferred embodiment of the present invention;
Fig. 3 is the realization flow figure of the inventive method one preferred embodiment.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
In wireless communication system, running time-frequency resource and the modulation coding mode of user in this sub-district is responsible for distributing in the base station, user terminal can not only keep being connected with home base stations, can also keep being connected by home base stations and a plurality of adjacent base stations, this process can adopt fast cell selection technology (Fast cell selection) to realize.The process that user terminal carries out the fast cell selection is as follows:
At first, send the intensity or the signal to noise ratio of signal in the signal that receives of user terminal measurement respectively by different base station, measured value is compared with the thresholding of communicating by letter.
Described communication thresholding is that user terminal sets in advance, and can be the intensity or the signal to noise ratio of signal.
The adjacent base station that follow, user terminal will arrive the communication thresholding reports the home base stations of described user terminal, by the home base stations report network, connects with all adjacent base stations that arrive the thresholding of communicating by letter.The set that the above-mentioned adjacent base station sub-district that connects with the user is formed is called Active Set.
Then, a signal strength signal intensity or a best base station of signal to noise ratio in the user terminal selecting Active Set, send the selection signal by up link to this base station.Selected base station becomes the new home base stations of this user terminal after receiving and selecting signal.
Wherein, the down link that user terminal and home base stations are set up comprises Traffic Channel and control channel, and this user's service signal issues by Traffic Channel, and the down link that user terminal and adjacent base station are set up only is a control channel.
The present invention keeps the user who is connected to be called the user who is in the fast cell selection mode with in the said process with home base stations and a plurality of adjacent base stations simultaneously.
Fig. 2 is in the embodiment schematic diagram that fast cell selection mode user is connected with two base stations maintenances simultaneously.
In Fig. 2, base station 1 is user 1 a home base stations, and promptly user 1 is in 1 coverage cell in base station, and this moment, user 1 comprised Traffic Channel and control channel with the down link of base station 1 foundation, user 1 business datum is by base station 1 emission, so user 1 represented with being connected with solid line of base station 1; Base station 2 is user 1 a adjacent base station, and the down link that user 1 and base station 2 are set up only is a control channel, so user 1 dotted with being connected of base station 2.In addition, base station 2 is home base stations of user 2,3 and 4, and the running time-frequency resource that user 2 adopts is identical with user 1, and user 3 is different with user 1 with 4 running time-frequency resources that adopt.Therefore, the interference user that in the present embodiment user 2 is called user 1.
Based on connection shown in Figure 2, the method flow of elimination presence of intercell interference of the present invention may further comprise the steps as shown in Figure 3:
Step 301, user 1 adopts fast cell selection method to elect base station 1 as home base stations, sets up the downlink control channel with base station 2, and by base station 1 running time-frequency resource that self uses reported base station 2.
Step 302, base station 2 are distributed different running time-frequency resources according to user 1 running time-frequency resource information for self user that administers, and judge whether noiseless distribution is successful, if success, base station 2 will be administered by control channel does not have the information of user's 1 interference user to notify user 1 in the sub-district, finish this interference cancellation process; Otherwise execution in step 303.
Described noiseless being allocated successfully is meant that adjacent base station needn't use the running time-frequency resource identical with user 1 just can satisfy the running time-frequency resource user demand of self institute's administrative area intra domain user.Because adjacent base station avoids using the running time-frequency resource identical with user 1, so can not cause interference to user 1.
If the customer volume of adjacent base station is bigger, above-mentioned noiseless distribution failure, adjacent base station must use to the administrative area intra domain user time-frequency resource allocating identical with user 1.
In the present embodiment, user 2 uses the running time-frequency resource identical with user 1, and promptly above-mentioned noiseless distribution is failed, so execution in step 303.
Step 303, base station 2 are distributed the modulation coding mode different with user 1 for interference user, and by the control channel between base station 2 and the user 1 modulation coding mode of all interference users are handed down to user 1.
In the present embodiment, the running time-frequency resource that user 2 uses is identical with user 1, so user 1 can be handed down to user 2 modulation coding mode in base station 2.
All there are self specific scrambler or interleaving mode in each base station, so the modulation coding mode that base station 2 is an interference user 2 to be distributed is different with user 1 certainly.
Because modulation coding mode can adjust accordingly along with the variation of communication environment and change, so base station 2 will issue the modulation coding mode of an interference user at each Transmission Time Interval (TTI), to guarantee that user 1 can receive effective interfere information in real time.
Step 304, user terminal 1 start the multi-user's iterative receiver of self, remove interference signal according to the modulation coding mode of interference user from the signal that user 1 receives, and obtain the service signal that home base stations 1 is handed down to user 1.
Described multi-user's iteration receives and is meant: when the signal that receives is a plurality of subscriber signals stack, detect the signal that receives according to a plurality of users' information, other subscriber signals are removed from the signal that receives, improve the receptivity of desired signal.The method of this employing multi-user iterative receiver separation signal is that prior art is existing.
In the present embodiment, the concrete processing of step 304 is: user 1 separates to the received signal to be in harmonious proportion and deciphers at first according to the modulation coding mode of interference user, obtains the decoded signal of interference user; Again decoded signal is encoded and modulate, thereby restore transmitting of interference user; At last, the signal that user side is received deducts transmitting of interference user, can obtain the service signal that home base stations 1 is handed down to user 1.
By the above embodiments as seen, the method of this elimination presence of intercell interference of the present invention is carried out noiseless time-frequency resource allocating to the adjacent base station user, and after noiseless distribution failure, the modulation coding information that directly issues interference user by adjacent base station is given the user who is in the fast cell selection mode in certain sub-district, make this user utilize the interference user modulation coding information that receives to carry out interference eliminated, thereby eliminate the interference that this community user is subjected to effectively.
Claims (9)
1, a kind of method of eliminating presence of intercell interference is characterized in that, this method may further comprise the steps:
A, user terminal and at least one adjacent base station connect, and by home base stations the running time-frequency resource information of self using are sent to the adjacent base station that connects;
After b, the adjacent base station that connects with the described user terminal of step a are received described running time-frequency resource information, give self user that administers of institute distribution and the different running time-frequency resource of the described user terminal of step a.
2, method according to claim 1 is characterized in that, the method that connects with at least one adjacent base station described in the step a is:
The signal message of a1, user terminal measurement different base station, and measured value compared with the thresholding of communicating by letter that sets in advance;
The base station information that a2, user terminal will arrive the communication thresholding reports home base stations, being connected between the base station of being set up described arrival communication thresholding by home base stations and the user terminal.
3, method according to claim 2 is characterized in that, the described signal message of step a1 is signal strength signal intensity or signal to noise ratio.
4, method according to claim 1 is characterized in that, step b further comprises: adjacent base station is judged the whether success of distribution of running time-frequency resource, if success then finish this interference cancellation process; Otherwise execution following steps:
B1, described adjacent base station are given the user who self administers with the identical time-frequency resource allocating that the described user terminal of step a uses, and by using the modulation coding mode of the interference user of identical running time-frequency resource to send to the described user terminal of step a with the connection that the described user terminal of step a is set up;
The described user terminal of b2, step a is isolated the interference user signal according to the modulation coding mode of interference user from the signal that receives, obtain the service signal that home base stations sends.
5, method according to claim 4, it is characterized in that, when the success of the time-frequency resource allocating of adjacent base station, before finishing this interference cancellation process, this method further comprises: adjacent base station sends noiseless user notification to the described user terminal of step a.
6, method according to claim 4 is characterized in that, among the step b1, adjacent base station sends the modulation coding mode of an interference user to user terminal at each Transmission Time Interval.
7, method according to claim 4 is characterized in that, the method for isolating the interference user signal among the step b2 from the signal that receives is:
B21, according to the modulation coding mode of interference user, separate to the received signal and be in harmonious proportion decoding, obtain the decoded signal of interference user;
B22, decoded signal is encoded and modulated, obtain transmitting of interference user;
B23, from the signal that receives, deduct transmitting of step interference user that b22 obtains, realize the separation of interference user signal.
According to claim 4 or 7 described methods, it is characterized in that 8, the method for the described separation interference user of step b2 signal is realized by multi-user's iterative receiver.
9, method according to claim 4 is characterized in that, described modulation coding mode comprise scrambler, chnnel coding and the three kinds of modes that interweave at least a mode.
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| CN 200510077609 CN1881867A (en) | 2005-06-17 | 2005-06-17 | Method for eliminating interference between cells |
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| WO2008095393A1 (en) * | 2007-02-02 | 2008-08-14 | Huawei Technologies Co., Ltd. | Method of uplink resources distributing on a time division sharing channel mode and base station thereof |
| CN101599793A (en) * | 2008-06-05 | 2009-12-09 | 华为技术有限公司 | Definite method, device and the system of Physical Resource Block operating position |
| CN101686550A (en) * | 2008-09-27 | 2010-03-31 | 华为技术有限公司 | Inter-cell interference suppression method, system and base station and user terminal |
| CN101500246B (en) * | 2008-01-31 | 2010-12-29 | 大唐移动通信设备有限公司 | Data transceiving method and apparatus based on communication system provided with relay station |
| CN101940021A (en) * | 2008-02-13 | 2011-01-05 | 日本电信电话株式会社 | Wireless communication system, interference cancellation station, and interference cancellation method |
| CN102045856A (en) * | 2009-10-14 | 2011-05-04 | 上海贝尔股份有限公司 | Signal receiving method and equipment thereof |
| CN102088780A (en) * | 2009-12-03 | 2011-06-08 | 电信科学技术研究院 | Method and base station for avoiding signal interference in hierarchical network |
| CN102257867A (en) * | 2008-12-26 | 2011-11-23 | 日本电气株式会社 | Radio communication system, base station device, and channel allocation method |
| CN101237670B (en) * | 2007-02-02 | 2012-01-11 | 华为技术有限公司 | Uplink resource allocation method and base station under time division share channel mode |
| CN101516139B (en) * | 2008-02-22 | 2012-04-18 | 中兴通讯股份有限公司 | Method for concentrated distribution of a plurality of base station precoders |
| CN102711258A (en) * | 2011-03-28 | 2012-10-03 | 华为技术有限公司 | Method and device for avoiding inter-cell interference |
| CN101374269B (en) * | 2007-08-23 | 2012-10-10 | 中兴通讯股份有限公司 | MBMS resources distribution method for TDD mode wireless communication system |
| CN103155678A (en) * | 2011-02-12 | 2013-06-12 | 富士通株式会社 | Method and device for allocating uplink channel resource of cooperative multi-point transmission/reception |
| CN101626255B (en) * | 2008-07-11 | 2013-08-14 | 电信科学技术研究院 | Method, system, device and terminal for eliminating interference |
| CN103262461A (en) * | 2010-11-02 | 2013-08-21 | 高通股份有限公司 | Method and apparatus for rate matching with muting |
| CN104081697A (en) * | 2012-01-30 | 2014-10-01 | 诺基亚通信公司 | Non-orthogonal transmit mode |
| CN105379389A (en) * | 2014-06-11 | 2016-03-02 | 华为技术有限公司 | Base station and communication method for reducing channel interference |
| US9344246B2 (en) | 2010-10-08 | 2016-05-17 | Qualcomm Incorporated | Reference signal configuration and relay downlink control channel |
| CN108633017A (en) * | 2017-03-23 | 2018-10-09 | 中兴通讯股份有限公司 | Resource allocation methods, base station, mobile terminal and communication control method and its system |
| CN113939033A (en) * | 2021-09-16 | 2022-01-14 | 中国联合网络通信集团有限公司 | Resource allocation method, device and computer readable storage medium |
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- 2005-06-17 CN CN 200510077609 patent/CN1881867A/en active Pending
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| WO2008095393A1 (en) * | 2007-02-02 | 2008-08-14 | Huawei Technologies Co., Ltd. | Method of uplink resources distributing on a time division sharing channel mode and base station thereof |
| CN101237670B (en) * | 2007-02-02 | 2012-01-11 | 华为技术有限公司 | Uplink resource allocation method and base station under time division share channel mode |
| CN101374269B (en) * | 2007-08-23 | 2012-10-10 | 中兴通讯股份有限公司 | MBMS resources distribution method for TDD mode wireless communication system |
| CN101500246B (en) * | 2008-01-31 | 2010-12-29 | 大唐移动通信设备有限公司 | Data transceiving method and apparatus based on communication system provided with relay station |
| CN101940021A (en) * | 2008-02-13 | 2011-01-05 | 日本电信电话株式会社 | Wireless communication system, interference cancellation station, and interference cancellation method |
| CN101940021B (en) * | 2008-02-13 | 2013-09-18 | 日本电信电话株式会社 | Wireless communication system, interference cancellation station, and interference cancellation method |
| CN101516139B (en) * | 2008-02-22 | 2012-04-18 | 中兴通讯股份有限公司 | Method for concentrated distribution of a plurality of base station precoders |
| CN101599793A (en) * | 2008-06-05 | 2009-12-09 | 华为技术有限公司 | Definite method, device and the system of Physical Resource Block operating position |
| CN101599793B (en) * | 2008-06-05 | 2014-03-12 | 华为技术有限公司 | Method for determining service condition of physical resource block, device and system |
| CN101626255B (en) * | 2008-07-11 | 2013-08-14 | 电信科学技术研究院 | Method, system, device and terminal for eliminating interference |
| CN101686550A (en) * | 2008-09-27 | 2010-03-31 | 华为技术有限公司 | Inter-cell interference suppression method, system and base station and user terminal |
| CN101686550B (en) * | 2008-09-27 | 2015-04-15 | 华为技术有限公司 | Inter-cell interference suppression method, system and base station and user terminal |
| CN102257867A (en) * | 2008-12-26 | 2011-11-23 | 日本电气株式会社 | Radio communication system, base station device, and channel allocation method |
| CN102257867B (en) * | 2008-12-26 | 2014-05-07 | 日本电气株式会社 | Radio communication system, base station device, and channel allocation method |
| CN102045856A (en) * | 2009-10-14 | 2011-05-04 | 上海贝尔股份有限公司 | Signal receiving method and equipment thereof |
| CN102045856B (en) * | 2009-10-14 | 2013-09-11 | 上海贝尔股份有限公司 | Signal receiving method and equipment thereof |
| CN102088780A (en) * | 2009-12-03 | 2011-06-08 | 电信科学技术研究院 | Method and base station for avoiding signal interference in hierarchical network |
| WO2011066787A1 (en) * | 2009-12-03 | 2011-06-09 | 电信科学技术研究院 | Method and base station for avoiding signal interference in a layered network |
| CN102088780B (en) * | 2009-12-03 | 2013-11-06 | 电信科学技术研究院 | Method and base station for avoiding signal interference in hierarchical network |
| US9344246B2 (en) | 2010-10-08 | 2016-05-17 | Qualcomm Incorporated | Reference signal configuration and relay downlink control channel |
| CN103262461B (en) * | 2010-11-02 | 2016-06-15 | 高通股份有限公司 | For having method and the device of quiet rate-matched |
| CN103262461A (en) * | 2010-11-02 | 2013-08-21 | 高通股份有限公司 | Method and apparatus for rate matching with muting |
| US9130725B2 (en) | 2010-11-02 | 2015-09-08 | Qualcomm Incorporated | Interaction of PDSCH resource mapping, CSI-RS, and muting |
| CN103155678A (en) * | 2011-02-12 | 2013-06-12 | 富士通株式会社 | Method and device for allocating uplink channel resource of cooperative multi-point transmission/reception |
| CN102711258B (en) * | 2011-03-28 | 2014-12-24 | 华为技术有限公司 | Method and device for avoiding inter-cell interference |
| CN102711258A (en) * | 2011-03-28 | 2012-10-03 | 华为技术有限公司 | Method and device for avoiding inter-cell interference |
| WO2012129903A1 (en) * | 2011-03-28 | 2012-10-04 | 华为技术有限公司 | Method and device for preventing inter-cell interference |
| CN104081697A (en) * | 2012-01-30 | 2014-10-01 | 诺基亚通信公司 | Non-orthogonal transmit mode |
| CN104081697B (en) * | 2012-01-30 | 2018-04-24 | 诺基亚通信公司 | Non-orthogonal transmission pattern |
| CN105379389A (en) * | 2014-06-11 | 2016-03-02 | 华为技术有限公司 | Base station and communication method for reducing channel interference |
| CN108633017A (en) * | 2017-03-23 | 2018-10-09 | 中兴通讯股份有限公司 | Resource allocation methods, base station, mobile terminal and communication control method and its system |
| CN108633017B (en) * | 2017-03-23 | 2022-11-18 | 中兴通讯股份有限公司 | Resource allocation method, base station, mobile terminal, communication control method and system thereof |
| CN113939033A (en) * | 2021-09-16 | 2022-01-14 | 中国联合网络通信集团有限公司 | Resource allocation method, device and computer readable storage medium |
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