CN102905377A - Method for managing wireless uplink SDMA (space division multiple address) resources in wireless communication system - Google Patents
Method for managing wireless uplink SDMA (space division multiple address) resources in wireless communication system Download PDFInfo
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- CN102905377A CN102905377A CN201110212916XA CN201110212916A CN102905377A CN 102905377 A CN102905377 A CN 102905377A CN 201110212916X A CN201110212916X A CN 201110212916XA CN 201110212916 A CN201110212916 A CN 201110212916A CN 102905377 A CN102905377 A CN 102905377A
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Abstract
The invention provides a method for managing wireless uplink SDMA (space division multiple address) resources in a wireless communication system. The method includes following steps, by the aid of a base station, (a) periodically updating user information in a cell; (b) judging whether to perform SDMA dimension limit to channel resources occupied by users or not according to the user information and updating a usable channel resource list; and (c) distributing channels for users according to user requests and usable channel resources. By dimensionally limiting sub-channels utilizing SDMA technology in the cell, management of SDMA wireless resources is simplified on the premise that Qos (quality of service) for the users is guaranteed. Meanwhile, effects to other communities are fully considered to guarantee that the capacity of the integral system is in maximum state.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to the method for up SDMA RRM in a kind of wireless communication system.
Background technology
Space division multiple access access (Spatial Division Multiple Access is called for short SDMA) is a kind of by utilizing Spatial Dimension to make the technology of a plurality of user's shared communication resources (for example, frequency, channel etc.).Because the SDMA technology will be utilized user's spatial character, so adopt the system of SDMA technology generally to be multiaerial system, the spatial information that namely obtains more to enrich by a plurality of antennas.The dimension of SDMA has determined the resource multiplex number of times, and namely resource can multiplexing n time in the n dimension SDMA small area, can imagine that this moment, power system capacity just increased n times.Therefore it has been generally acknowledged that adopting the SDMA technology is an effective means of capacity.
But above-described just ideal situation, in the reality, because the user spatially can not accomplish to isolate fully or owing to restrictions such as many days linear resolutions in the residential quarter, along with the increase of SDMA dimension, the interference in the system between the user also increases, so, this moment, power system capacity was not proportional increase along with the increase of dimension, and can predict owing to adopt the SDMA technology, user's increase in the residential quarter is bound to increase the complexity that intra-cell resource is managed.
More common SDMA method for managing resource is at present, all users spatial character each other in the residential quarter is calculated according to certain criterion, then carry out resource and distribute, although the method possible in theory of this traversal, amount of calculation is unacceptable in realizing.And probably the performance of some subchannel own is bad or just satisfied Qos (service quality) requirement in the reality, this subchannel is not suitable for adopting the SDMA technology to distribute to other users again, participate in above-mentioned ergodic process so take the user of these subchannels, the amount of calculation of base station can only be increased, the lifting of cell capacity can not be brought.In addition, the target of present SDMA radio resource management method all is to make the cell capacity maximization, yet in actual networking, when using SDMA to maximize this cell capacity, particularly to the subchannel of Cell Edge User during employing SDMA, probably increased the interference to other residential quarters, be not maximum capacity from the angle of system this moment yet.
Summary of the invention
The object of the present invention is to provide the method for up SDMA RRM in a kind of wireless communication system, signal noise ratio (SNR) in the residential quarter that the base station obtains according to demodulation behind the range information to the base station, the user wave beam figuration that calculates or the Interference Cancellation of reporting of user, judge whether that the channel resource that the user has been taken carries out the SDMA dimension limit, effectively manage taking with available Radio Resource, and on this basis the new resource request of user is carried out rational resource and distribute, to guarantee QoS of customer and power system capacity.
The present invention proposes the method for up SDMA RRM in a kind of wireless communication system, comprise following steps:
A. the base station periodically updates the user profile in the residential quarter, and described user profile comprises: the user is to base station distance and user's demodulation SNR;
B. the base station judges according to described user profile whether the channel resource to CU carries out the SDMA dimension limit, and upgrades the available channel resources tabulation;
C. the base station is the user assignment channel according to user's request and available channel resources.
Among the preferred step a, described user can calculate by terminal to the distance of base station, utilizes up signaling channel to report the base station; Described user's demodulation SNR information can merge beamforming algorithm and the MVDR interference cancellation algorithm draws by high specific.
Preferably, described SDMA is two-dimentional, and described step b specifically comprises:
If b1. the user greater than the preset distance thresholding, then the shared channel resource of this user can not carry out SDMA and shares, otherwise enters step b2 to base station distance;
If b2. user's demodulation SNR is less than predetermined SNR thresholding, then the shared channel resource of this user can not carry out SDMA and shares, otherwise enters step b3;
If b3. the shared channel resource of this user carries out SDMA with other user and shares, then the shared channel resource of this user can not carry out SDMA again and shares, otherwise the shared channel resource of this user is added the available channel resources tabulation.
Among the preferred step c, preferentially select the user of requests resource allocation and the available channel resources of the spatial coherence minimum between the user under the available channel resources to distribute.
Preferably, channel resource described above can be frequency resource or time-frequency piece resource or code channel resource.
The beneficial effect of technical scheme provided by the invention is: 1, and carry out dimension limit to adopting the subchannel of SDMA technology in the residential quarter, thereby simplified the SDMA RRM on the basis that guarantees user Qos.2, in the residential quarter during RRM, considered the impact on other residential quarters, maximum to guarantee the whole system capacity.
Description of drawings
Fig. 1 is the flow chart that the SDMA RRM is carried out in base station of the present invention;
Fig. 2 is three base station network schematic diagrames of the embodiment of the invention;
Fig. 3 is the reporting of user distance that obtains of the BS1 of the embodiment of the invention and the tabulation figure of SNR;
Fig. 4 is the flow chart of the base station maintenance available channel resources tabulation of the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in detail.
The basic thought of SDMA RRM of the present invention may further comprise the steps as shown in Figure 1: 101 base stations periodically update the user to base station distance and user's demodulation SNR; 102 base stations judge according to described user profile whether the channel resource to CU carries out the SDMA dimension limit, and upgrade the available channel resources tabulation; 103 base stations are the user assignment channel according to user's request and available channel resources.
The specific embodiment of the invention provides three base station radio communication networks, as shown in Figure 2,3 base stations is arranged in this network, is respectively BS1, BS2 and BS3.Describe as an example of the RRM of BS1 example, BS2 and BS3 are the adjacent base station of BS1.BS1 one has four sub-channels SCH1, SCH2, SCH3, SCH4, and adopt two-dimentional SDMA, then the actual spendable sub channel resource tabulation of BS1 is { SCH1_1, SCH1_2, SCH2_1, SCH2_2, SCH3_1, SCH3_2, SCH4_1, SCH4_2}, the wherein Spatial Dimension of the numeral subchannel of underscore back.Three active users are arranged under the current BS1, UE1, UE2, UE3, shared sub channel resource is respectively SCH1_1, SCH2_1, SCH3_1, also has a new access user UE4, waits for the BS1 allocation of channel resources may.
The BS1 demodulation terminal to report with distance this base station, this information sends to the base station by terminal according to the protection slot length calculating between receiving signal and transmitting and by up signaling channel; And BS1 calculates user's demodulation SNR.The base station can select adopt wave beam forming or Interference Cancellation to carry out many antennas according to received signal quality to merge to obtain SNR.BS1 adopts a kind of high specific to merge the beam form-endowing method of (MRC) in the present embodiment, namely directly merges as many antenna weights receiving the sense vector.In addition, BS1 can also adopt the interference cancellation algorithm of the undistorted response of minimum variance (MVDR) to merge, and namely weight is
Carry out many antennas and merge, wherein R
NnBe the autocorrelation matrix that disturbs, a is for receiving the sense vector.
The reporting of user distance that the BS1 demodulation obtains and the SNR after the demodulation are as shown in Figure 3.Because UE1 user is in cell edge (as shown in Figure 2), if this moment, UE1 user adopted the SDMA technology, and still keep present operating SNR, then probably need to increase power, will produce interference this moment to the user of adjacent base station BS2 and BS3, thereby the overall performance of system is descended.Although UE2 user is closer apart from the base station, it is very low to affect demodulation SNR because of interference, decline etc., is not enough to bear extra interference, so UE2 user also is not suitable for adopting the SDMA technology again.
Therefore the BS1 demodulation obtains need to upgrading list of available resources after the information of SNR after user's distance and the demodulation, and its flow process as shown in Figure 4.Concrete steps are as follows:
If a. the user arrives base station distance greater than thresholding 1 (1500m), then this user does not allow to carry out SDMA, otherwise enters step b;
If b. user's demodulation SNR is less than thresholding 2 (15dB), then this user does not allow to carry out SDMA, otherwise enters step c;
If c. this user has adopted the SDMA technology, namely the shared channel of this user is shared with another user, and then this user does not allow to carry out SDMA again, otherwise the shared subchannel of this user is added list of available resources.
For UE1, a that do not satisfy condition, so this user can not adopt SDMA, namely its shared subchannel (SCH1) can not be re-used.For UE2, a that satisfies condition, but the b that do not satisfy condition are so its shared subchannel (SCH2) also can not be used again.For UE3, satisfy condition simultaneously a, b, and this user also do not use SDMA, so the shared subchannel of UE3 (SCH3) can add list of available resources.
By above-mentioned steps, BS1 has upgraded the available resources managing listings, and this moment, the base station list of available resources was { SCH3_2, SCH4_1, SCH4_2}.
After this processing finished, BS1 need to begin that new user is carried out resource and distribute.The resource allocation methods that the embodiment of the invention adopts distributes for the resource that spatial coherence is less between another user under the preferential new user of selection and the available subchannels.This spatial coherence can be calculated by two users' reception sense vector, and 0 is complete quadrature, and 1 is that the space is fully similar, and if available subchannels not by other CUs then think that correlation is 0.Another user UE3 spatial coherence in the present embodiment under UE4 and the SCH3 is 0.1, with user's space correlation under the SCH4 be 0, then according to said method, user UE4 is assigned with and uses resource SCH4_1.
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. the method for up SDMA RRM in the wireless communication system is characterized in that, comprises following steps:
A. the base station periodically updates the user profile in the residential quarter, and described user profile comprises that the user arrives base station distance and user's demodulation SNR;
B. the base station judges according to described user profile whether the channel resource to CU carries out the SDMA dimension limit, and upgrades the available channel resources tabulation;
C. the base station is the user assignment channel according to user's request and available channel resources.
2. method according to claim 1, wherein said user calculates by terminal to the distance of base station, utilizes up signaling channel to report the base station.
3. method according to claim 1, wherein said user's demodulation SNR merges beamforming algorithm by high specific and draws.
4. method according to claim 1, wherein said user's demodulation SNR draws by the MVDR interference cancellation algorithm.
5. method according to claim 1 is characterized in that, described SDMA is two-dimentional, and described step b specifically comprises:
If b1. the user greater than the preset distance thresholding, then the shared channel resource of this user can not carry out SDMA and shares, otherwise enters step b2 to base station distance;
If b2. user's demodulation SNR is less than predetermined SNR thresholding, then the shared channel resource of this user can not carry out SDMA and shares, otherwise enters step b3;
If b3. the shared channel resource of this user carries out SDMA with other user and shares, then the shared channel resource of this user can not carry out SDMA again and shares, otherwise the shared channel resource of this user is added the available channel resources tabulation.
6. method according to claim 1 is characterized in that step c, preferentially selects the user of requests resource allocation and the available channel resources of the spatial coherence minimum between the user under the available channel resources to distribute.
7. method according to claim 1 is characterized in that, described channel resource is frequency resource or time-frequency piece resource or code channel resource.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103236878A (en) * | 2013-04-19 | 2013-08-07 | 西安交通大学 | Maximum ratio combining receiving vector estimation-based coordinated beamforming method |
| CN104254088A (en) * | 2013-06-25 | 2014-12-31 | 北京信威通信技术股份有限公司 | SDMA using method in wireless communication system |
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| CN101212288A (en) * | 2006-12-28 | 2008-07-02 | 中兴通讯股份有限公司 | Uplink multiple-user space division multiplexing method in OFDMA system |
| CN101233770A (en) * | 2005-06-16 | 2008-07-30 | 高通股份有限公司 | User separation in space division multiple access for a multi-carrier communication system |
| CN101964667A (en) * | 2010-10-22 | 2011-02-02 | 东南大学 | High-efficiency multi-antenna detection method for long term evolution scheme |
| CN102202384A (en) * | 2010-03-24 | 2011-09-28 | 电信科学技术研究院 | Method and device for controlling space division interference |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101233770A (en) * | 2005-06-16 | 2008-07-30 | 高通股份有限公司 | User separation in space division multiple access for a multi-carrier communication system |
| CN101212288A (en) * | 2006-12-28 | 2008-07-02 | 中兴通讯股份有限公司 | Uplink multiple-user space division multiplexing method in OFDMA system |
| CN102202384A (en) * | 2010-03-24 | 2011-09-28 | 电信科学技术研究院 | Method and device for controlling space division interference |
| CN101964667A (en) * | 2010-10-22 | 2011-02-02 | 东南大学 | High-efficiency multi-antenna detection method for long term evolution scheme |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103236878A (en) * | 2013-04-19 | 2013-08-07 | 西安交通大学 | Maximum ratio combining receiving vector estimation-based coordinated beamforming method |
| CN103236878B (en) * | 2013-04-19 | 2015-08-26 | 西安交通大学 | A kind of coordinates beam shaping method receiving vector estimation based on maximum-ratio combing |
| CN104254088A (en) * | 2013-06-25 | 2014-12-31 | 北京信威通信技术股份有限公司 | SDMA using method in wireless communication system |
| CN104254088B (en) * | 2013-06-25 | 2017-12-01 | 北京信威通信技术股份有限公司 | SDMA application methods in a kind of wireless communication system |
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