CN100423603C - Down beam shaping method in multi-carrier high-speed down group switching-in - Google Patents
Down beam shaping method in multi-carrier high-speed down group switching-in Download PDFInfo
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Abstract
A method for shaping downlink beam in multicarrier high speed downlink packet access selects uplink channel on local carrier preferentially to calculate shaping coefficient for realizing the shaping on downlink beam of user if uplink special physical channel DPCH and high speed shared information channel HS-SICH are distributed on local carrier of user and selects user uplink channel distributed on the other carrier to calculate shaping coefficient for realizing the shaping on downlink beam of user if uplink DHCH and HS-SICH are not distributed on local carrier of user.
Description
Technical field
The present invention relates to the mobile communication technology field, be specifically related to the method for down beam shaping in a kind of multi carrier wave high-speed downlink grouping access.
Background technology
In recent years, intelligent antenna technology has become in the mobile communication one of the most attractive technology.Smart antenna adopts SDMA (space division multiple access) technology, utilizes the difference of signal in transmission direction, with same frequency or same time slot, come with the signal distinguishing of code channel, maximally utilises limited channel resource.Compare with non-directional antenna, the antenna gain of its uplink and downlink link improves greatly, has reduced transmitted power level, has improved signal to noise ratio, has overcome the influence of Channel Transmission decline effectively.Simultaneously because the direct directed towards user of antenna lobe, reduced and this sub-district between other user, and and the neighbor cell user between interference, and reduced the multipath effect of mobile telecommunication channel.CDMA (code division multiple access) system is a power limited system, and the application of smart antenna has reached the raising antenna gain and reduced system interference two big purposes, thereby has enlarged power system capacity significantly, has improved the availability of frequency spectrum.
Smart antenna is the orthogonality of utilizing a plurality of antenna elements space in itself, i.e. the multiplexing function of space division multiple access improves the capacity and the availability of frequency spectrum of system.The function of smart antenna is to be finished jointly by antenna array and coupled baseband digital signal processing section.Two key issues that smart antenna need solve are the direction of identification signal and the realization of digital figuration.The elevation direction radiating pattern of smart antenna is identical with each antenna element.Control by baseband processor at azimuthal directional diagram, can produce a plurality of wave beams simultaneously, according to the distribution of communication user, any figuration in 360 ° scope.
So-called wave beam forming promptly according to measuring and the estimation parameter, is realized the process that signal optimum (suboptimum) combination or optimum (suboptimum) distribute.In traditional beamforming algorithm, calculate the phase difference of incoming wave on each antenna element according to the incoming wave angle of desired signal, forming coefficient is used for offsetting incoming wave signal on each unit of phase place official post on each unit with superimposed.For traditional beamforming algorithm, for the incoming wave of fixed-direction, its figuration system is fixed, so the shape of its beam pattern is fixed.Utilize wave beam forming can reduce in the system and disturb, improve power system capacity.
At present, in order to adapt to the demand of growing data service, 3GPP Rlease 5 (third generation partnership project version 5) has introduced HSDPA (high speed downlink packet access) technology, to improve the message transmission rate of down direction.The HSDPA technology is applicable to WCDMA FDD (broadband CDMA frequency divided duplex), UTRA TDD (universal terrestrial radio access time division duplex) and three kinds of different modes of TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) simultaneously.
The down beam shaping coefficient is by to uplink channel estimation in the TDD of many antennas (time division multiple access) system, utilizes the space matrix property calculation to obtain.For the HSDPA system of the single carrier of TDD, the up-downgoing DPCH (DPCH) of UE (subscriber equipment) and control channel HS-SCCH/HS-SICH (High-Speed Shared Control Channel/high-speed shared information channel) all with HS-PDSCH (high-speed physical downlink shared channel (HS-PDSCH)) on same carrier wave.Because the symmetry of up-downgoing channel, therefore common up DPCH channel calculation according to UE obtains the wave beam forming coefficient in single-carrier system, is used for HS-PDSCH channel, descending DPCH channel and HS-SCCH channel are carried out down beam shaping.
In order further to promote transmission of packet data speed, strengthen the superiority of HSDPA system on Packet data service, can adopt the multi-carrier HSDPA technology, promptly data can be simultaneously by a plurality of carrier waves to same user device transmissions.
In the system of the HSDPA of multicarrier, the HS-DSCH of a UE (high speed descending sharing channel) data can be transmitted on a plurality of frequencies simultaneously.The HS-PDSCH of UE on each carrier wave can corresponding one group of control channel HS-SCCH and HS-SICH.When channel resource allocation, each carrier wave of a UE all may be assigned control channel HS-SCCH/HS-SICH and up-downgoing DPCH channel, be assigned on each carrier wave of up DPCH and HS-SICH, can calculating one group of beam shaping coefficient based on up DPCH and HS-SICH.But channel variance situation on each carrier wave and disturbed condition are all different, like this in multicarrier system to the down channel (HS-PDSCH of each carrier wave of a UE, HS-SCCH, when descending DPCH) carrying out wave beam forming, how correctly to choose the wave beam forming coefficient and guarantee that downlink forming is more accurate, also do not have effective solution in the prior art.
Summary of the invention
The purpose of this invention is to provide the method for down beam shaping in a kind of multi carrier wave high-speed downlink grouping access,, reduce effectively in the system and disturb, improve power system capacity to choose the figuration parameter of down channel in the multi-carrier HSDPA system exactly.
For this reason, the invention provides following technical scheme:
The method of down beam shaping during a kind of multi carrier wave high-speed downlink grouping inserts, described method comprises step:
If distributed uplink special physical channel DPCH and high-speed shared information channel HS-SICH on this carrier wave of A user, and the demodulation signal to noise ratio of one of up all DPCH of this carrier wave and HS-SICH is greater than predefined signal-noise ratio threshold value, forming coefficient is obtained in the up channel calculating of then preferentially choosing on this carrier wave, realizes the down beam shaping to this user;
B otherwise, if the demodulation signal to noise ratio of one of all up DPCH and HS-SICH is greater than described signal-noise ratio threshold value on other carrier waves, then choose this user uplink channel calculation of distributing on other carrier waves and obtain forming coefficient, realize down beam shaping this user.
Before described steps A, also comprise step:
Up DPCH that distributes on each carrier wave to the user and HS-SICH calculate its wave beam forming coefficient and demodulation signal to noise ratio respectively.
Described steps A comprises:
A1, obtain demodulation signal to noise ratio on this carrier wave greater than each the up DPCH of the signal-noise ratio threshold value of setting and the demodulation signal to noise ratio of HS-SICH correspondence;
The wave beam forming coefficient of the up channel correspondence of A2, selecting demodulated signal to noise ratio maximum is as this user's down beam shaping coefficient.
Described steps A further comprises:
When the response time of the HS-SICH on this carrier wave surpassed predetermined value at interval, the wave beam forming coefficient of the DPCH correspondence of selecting demodulated signal to noise ratio maximum was as this user's down beam shaping coefficient.
Described step B also comprises:
When the demodulation signal to noise ratio of up DPCH on the every other carrier wave and HS-SICH during, keep the last wave beam forming coefficient all smaller or equal to the signal-noise ratio threshold value set.
Choose this user uplink channel calculation of distributing on other carrier waves among the described step B and obtain forming coefficient, realize this user's down beam shaping is comprised:
B1, obtain demodulation signal to noise ratio on described other carrier waves greater than each the up DPCH of the signal-noise ratio threshold value of setting and the demodulation signal to noise ratio of HS-SICH correspondence;
The wave beam forming coefficient of the up channel correspondence of B2, selecting demodulated signal to noise ratio maximum is as this user's down beam shaping coefficient.
Described step B2 further comprises:
When the response time of the HS-SICH on this carrier wave surpassed predetermined value at interval, the wave beam forming coefficient of the up DPCH correspondence of selecting demodulated signal to noise ratio maximum was as this user's down beam shaping coefficient.
By above technical scheme provided by the invention as can be seen, the present invention is based on the symmetry of TDD system up-downgoing channel, pass through uplink channel estimation, utilize the space matrix property calculation to obtain the down beam shaping coefficient, and at the characteristics of multi-carrier HSDPA system, the control channel HS-SCCH and the HS-SICH of each carrier wave of a user, up-downgoing DPCH can be distributed on this carrier wave, also can be assigned on other the carrier wave, the HS-SICH and the up DPCH of each carrier wave correspondence of distributing according to the user can calculate one group of wave beam forming coefficient, one group of wave beam forming coefficient of the up channel correspondence of therefrom selecting demodulated signal to noise ratio maximum is realized the down beam shaping to this user as this user's wave beam forming coefficient.In forming coefficient is chosen, the preferential wave beam forming coefficient of selecting the up channel correspondence on this carrier wave, the forming coefficient of promptly using the up channel on the identical frequency to obtain, and all carrier waves of user's correspondence have been taken all factors into consideration, all up channels on each carrier wave, and channel quality on each carrier wave and disturbed condition, the forming coefficient of the up channel correspondence that selecting demodulated signal to noise ratio is higher, more accurate when having guaranteed downlink forming, the figuration better effects if, reduce effectively in the system and disturb, improve power system capacity.
Description of drawings
Fig. 1 is the realization flow figure of the inventive method.
Embodiment
Core of the present invention is based on the symmetry of TDD system up-downgoing channel, pass through uplink channel estimation, utilize the space matrix property calculation to obtain the down beam shaping coefficient, and at the characteristics of multi-carrier HSDPA system, the control channel HS-SCCH and the HS-SICH of each carrier wave of a user, up-downgoing DPCH can be distributed on this carrier wave, also can be assigned on other the carrier wave, the HS-SICH and the up DPCH of each carrier wave correspondence of distributing according to the user can calculate one group of wave beam forming coefficient, one group of wave beam forming coefficient of the up channel correspondence of therefrom selecting demodulated signal to noise ratio maximum is realized the down beam shaping to this user as this user's wave beam forming coefficient.In choosing, preferentially select the wave beam forming coefficient of the up channel correspondence on this carrier wave.
The present technique field personnel know, smart antenna adopts plural single antenna array element to form antenna array, the signal that each array element receives is weighted summation through after the radio frequency processing with proper weight, can reach the effect of directional reception, and a weight vector correspondence certain beam pattern.The essence of weighting is a kind of space filtering, and smart antenna also can be thought a kind of SDMA (space division multiple access) technology.In SDMA, pass through the aerial array received signal, and carry out digital beam forming by Digital Signal Processing, just desired signal is strengthened by phase place and the amplitude of adjusting the aerial array received signal, and other interference signals are weakened, finally make the signal to noise ratio maximum of desired signal.
Smart antenna generally is divided into two kinds.A kind of is the switched-beam smart antenna, promptly preestablishes the wave beam weight that some point to different directions, and reasonable those wave beam weight weighted results of selective reception signal are carried out subsequent treatment in communication process.Another kind is an adaptive smart antenna, the weights of this antenna do not need to set in advance, bring in constant renewal in weights but press certain criterion according to the variation of signal space distribution character, the amplitude of weights and phase place can freely be upgraded, and the spatial character that this method can make full use of desired user signal and interference signal when algorithmic statement makes the Signal to Interference plus Noise Ratio of the signal that receives reach maximum.
The benefit that the base station of TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) system can utilize intelligent antenna technology to bring respectively at up-downlink direction, at down direction, smart antenna concentrates on radio frequency energy on targeted customer's the direction by wave beam forming, not only improved equivalent transmitting gain, also reduced interference other users to the targeted customer; And at up direction, smart antenna can carry out space filtering to all received signals, thereby realizes that optimum signal to the targeted customer receives and to the inhibition of other subscriber signal.Like this, smart antenna not only can reduce the interference to this community user, also can reduce the interference to other community user.
The present invention can utilize smart antenna, obtains the down beam shaping coefficient in real time according to the variation of multi-carrier HSDPA system signal spatial characteristics, and each user is realized down beam shaping preferably.
Among the 3GPP Release 5 TD-SCDMA has also been formulated corresponding HSDPA technical specification, defined HS-DSCH (high speed descending sharing channel) on the down direction and finished downlink data transmission at a high speed.As the transmission channel that a time shares, it is mapped to redetermination physical down data channel a: HS-PDSCH (high-speed physical downlink shared channel (HS-PDSCH)).The shared control channel of two physical layers relevant with HS-DSCH: descending HS-SCCH and up HS-SICH, also in standard, define, by the cooperation of these two control channels, finish the closed-loop control of transfer of data.
The control information of HS-DSCH channel is sent by HS-SCCH.When UE will be when the HS-DSCH channel receives data, whether be the data that pass to oneself, after the user obtains affirmation, just can receive data from the HS-DSCH channel if can arrive first that HS-SCCH monitors on next HS-DSCH TTI (Transmission Time Interval).
The TDD mode is used a Uplink Shared Channel, and promptly HS-SICH (high-speed shared information channel) transmits ACK/NACK information, thereby guarantees that uplink synchronous is still effective in HSDPA.The user transmits HARQ the affirmation information and the channel quality of (mixing automatic repeat requests) with the HS-SICH channel, thereby provides feedback for the packet scheduling and the re-transmission of base station.
In the multi-carrier HSDPA system, on each carrier wave, all need to carry out respectively the downlink wave beam excipient.Therefore, as a UE (subscriber equipment) when being assigned a plurality of carrier wave, need handle respectively, in order to be distinguished each carrier wave, the carrier wave that will work as pre-treatment is called this carrier wave, and UE remaining carrier wave except that this carrier wave is referred to as other carrier waves.This naming method is all used in following description.
In order to make those skilled in the art person understand the present invention program better, the present invention is described in further detail below in conjunction with drawings and embodiments.
With reference to Fig. 1, Fig. 1 is the realization flow figure of the inventive method, may further comprise the steps:
Step 101: preestablish the signal-noise ratio threshold value.
The signal-noise ratio threshold value can obtain by system emulation and link simulation early stage, can determine by the network planning during practical application.
Step 102: up DPCH that distributes on each carrier wave to the user and HS-SICH calculate its wave beam forming coefficient and demodulation signal to noise ratio respectively.
The present technique field personnel know, for the multi-carrier HSDPA system, each carrier wave in a plurality of carrier waves of a UE distribution all may be assigned control channel HS-SCCH/HS-SICH and up-downgoing DPCH channel, on each carrier wave that is assigned up DPCH channel and HS-SICH channel, base station side can calculate the demodulation signal to noise ratio of one group of beam shaping coefficient and each self-channel correspondence based on up DPCH and HS-SICH.
In the prior art, beam shaping coefficient and demodulation signal to noise ratio can have several different methods to calculate, such as, the beam shaping coefficient can be by estimating up channel, utilize the space matrix property calculation to obtain, the demodulation signal to noise ratio can calculate by joint detection algorithm, is not described in detail at this.
Step 103: judge whether distributed up DPCH and HS-SICH on this carrier wave.
If then enter step 104: judge that further whether one of them demodulation signal to noise ratio of all up DPCH on this carrier wave and HS-SICH is greater than setting the signal-noise ratio threshold value; Otherwise, enter step 107.
All up DPCH that calculate on this carrier wave and the demodulation signal to noise ratio of HS-SICH and the signal-noise ratio threshold value of setting are compared, as long as the signal to noise ratio that a up channel is arranged is then preferentially chosen the wave beam forming coefficient of the wave beam forming coefficient of this up channel correspondence as this this carrier wave of user greater than the signal-noise ratio threshold value of setting; If the signal to noise ratio that a plurality of up channels are arranged on this carrier wave is arranged greater than the signal-noise ratio threshold value of setting, then from these up channels, chooses the wave beam forming coefficient of the wave beam forming coefficient of a suitable channel correspondence as this this carrier wave of user.
In order to obtain better figuration effect, one group of forming coefficient that can selecting demodulated snr value maximum is as the wave beam forming coefficient of this this carrier wave of user.
Step 105: the demodulation signal to noise ratio of demodulation signal to noise ratio on this carrier wave greater than each up channel of the signal-noise ratio threshold value of setting compared, and one group of forming coefficient of selecting demodulated snr value maximum is as the wave beam forming coefficient of this this carrier wave of user.
Any one carrier wave for the user, if distributed up DPCH and HS-SICH on this carrier wave, and the demodulation signal to noise ratio of HS-SICH on this carrier wave and/or up DPCH is greater than certain signal-noise ratio threshold value, illustrate that the uplink signal-channel quality on this carrier wave has reached certain requirement, at this moment can preferentially choose up channel on this carrier wave and calculate the forming coefficient obtain and carry out down beam shaping.
Owing to may distribute the up DPCH and the HS-SICH of a plurality of carrier waves of user's correspondence on this carrier wave, then on this carrier wave, can calculate many group wave beam forming coefficients according to a plurality of up channels.Choosing of wave beam forming coefficient based on the maximum signal to noise ratio principle, under the condition of demodulation signal to noise ratio greater than certain signal-noise ratio threshold value of up channel, that group wave beam forming coefficient of selecting demodulated signal to noise ratio maximum carries out figuration to the down channel on this carrier wave, because the forming coefficient of using the uplink information of identical frequency to obtain is more accurate, therefore can obtain figuration effect preferably.
Very long can't in time the acquisition under the situation of its corresponding forming coefficient of the time interval that HS-SICH responds, the wave beam forming coefficient that can only select up DPCH to calculate carries out downlink forming.
Step 106: the wave beam forming that on this carrier wave, carries out down channel.
Step 107: further judge whether distributed up DPCH and HS-SICH on other carrier waves.
If then enter step 108: judge that whether one of them demodulation signal to noise ratio of all up DPCH on other carrier waves and HS-SICH is greater than the signal-noise ratio threshold value of setting; Otherwise, enter step 110.
Step 109: the demodulation signal to noise ratio of demodulation signal to noise ratio on other carrier waves greater than each up channel of the signal-noise ratio threshold value of setting compared, choose the wave beam forming coefficient of one group of forming coefficient of snr value maximum as this this carrier wave of user.Then, enter step 106: the wave beam forming that on this carrier wave, carries out down channel.
If distributed up DPCH and HS-SICH on this carrier wave, but at this moment the demodulation signal to noise ratio of up DPCH and HS-SICH just can consider to select for use the forming coefficient that calculates on other carrier waves all less than the signal-noise ratio threshold value of setting.
Equally, on other carrier waves, also may distribute the up DPCH and the HS-SICH of a plurality of carrier waves of user's correspondence, then on other carrier waves, can calculate many group wave beam forming coefficients according to a plurality of up channels.Choosing of wave beam forming coefficient equally based on the maximum signal to noise ratio principle, under the condition of demodulation signal to noise ratio greater than certain signal-noise ratio threshold value of up channel, that group wave beam forming coefficient of selecting demodulated signal to noise ratio maximum carries out figuration to the down channel on this carrier wave.
Step 110: keep the wave beam forming coefficient of the last time of this user, continue wave beam forming coefficient as this this carrier wave of user.Then, enter step 106: the wave beam forming that on this carrier wave, carries out down channel.
If the demodulation signal to noise ratio of up DPCH on all carrier waves and HS-SICH is all less than the signal-noise ratio threshold value of setting, the degradation of up channel this moment is described, then the wave beam forming coefficient of this carrier wave is not done renewal, still keeps the last forming coefficient to carry out figuration.Like this, can improve the overall performance of system.
Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, wish that appended claim comprises these distortion and variation and do not break away from spirit of the present invention.
Claims (7)
1. the method for down beam shaping during a multi carrier wave high-speed downlink grouping inserts is characterized in that described method comprises step:
If distributed uplink special physical channel DPCH and high-speed shared information channel HS-SICH on this carrier wave of A user, and the demodulation signal to noise ratio of one of up all DPCH of this carrier wave and HS-SICH is greater than predefined signal-noise ratio threshold value, forming coefficient is obtained in the up channel calculating of then preferentially choosing on this carrier wave, realizes the down beam shaping to this user;
B otherwise, if the demodulation signal to noise ratio of one of all up DPCH and HS-SICH is greater than described signal-noise ratio threshold value on other carrier waves, then choose this user uplink channel calculation of distributing on other carrier waves and obtain forming coefficient, realize down beam shaping this user.
2. the method for down beam shaping is characterized in that during multi carrier wave high-speed downlink grouping according to claim 1 inserted, and also comprised step before described steps A:
Up DPCH that distributes on each carrier wave to the user and HS-SICH calculate its wave beam forming coefficient and demodulation signal to noise ratio respectively.
3. the method for down beam shaping during multi carrier wave high-speed downlink grouping according to claim 2 inserts is characterized in that described steps A comprises:
A1, obtain demodulation signal to noise ratio on this carrier wave greater than each the up DPCH of the signal-noise ratio threshold value of setting and the demodulation signal to noise ratio of HS-SICH correspondence;
The wave beam forming coefficient of the up channel correspondence of A2, selecting demodulated signal to noise ratio maximum is as this user's down beam shaping coefficient.
4. the method for down beam shaping during multi carrier wave high-speed downlink grouping according to claim 3 inserts is characterized in that described steps A further comprises:
When the response time of the HS-SICH on this carrier wave surpassed predetermined value at interval, the wave beam forming coefficient of the DPCH correspondence of selecting demodulated signal to noise ratio maximum was as this user's down beam shaping coefficient.
5. the method for down beam shaping during multi carrier wave high-speed downlink grouping according to claim 1 inserts is characterized in that described step B also comprises:
When the demodulation signal to noise ratio of up DPCH on the every other carrier wave and HS-SICH during, keep the last wave beam forming coefficient all smaller or equal to the signal-noise ratio threshold value set.
6. the method for down beam shaping during multi carrier wave high-speed downlink grouping according to claim 1 inserts, it is characterized in that, choose this user uplink channel calculation of distributing on other carrier waves among the described step B and obtain forming coefficient, realize this user's down beam shaping is comprised:
B1, obtain demodulation signal to noise ratio on described other carrier waves greater than each the up DPCH of the signal-noise ratio threshold value of setting and the demodulation signal to noise ratio of HS-SICH correspondence;
The wave beam forming coefficient of the up channel correspondence of B2, selecting demodulated signal to noise ratio maximum is as this user's down beam shaping coefficient.
7. the method for down beam shaping during multi carrier wave high-speed downlink grouping according to claim 6 inserts is characterized in that described step B further comprises:
When the response time of the HS-SICH on this carrier wave surpassed predetermined value at interval, the wave beam forming coefficient of the up DPCH correspondence of selecting demodulated signal to noise ratio maximum was as this user's down beam shaping coefficient.
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| CN101442757B (en) * | 2007-11-21 | 2013-01-23 | 中国移动通信集团公司 | Method for setting intelligent antenna system and apparatus and system thereof |
| CN101605375B (en) * | 2008-06-11 | 2011-02-09 | 大唐移动通信设备有限公司 | Method for sending signalings on downlink control channel |
| CN101741446B (en) * | 2008-11-14 | 2013-05-01 | 中兴通讯股份有限公司 | Multiple-input multiple-output method and device |
| CN101505182B (en) * | 2009-03-18 | 2013-04-17 | 北京邮电大学 | Data transmission method and base station based on wave beam forming in multi-antenna system |
| CN101998410B (en) * | 2009-08-20 | 2013-04-03 | 电信科学技术研究院 | Method and device for grouping space division multiple address (SDMA) users |
| CN102571181B (en) * | 2010-12-27 | 2014-11-05 | 中兴通讯股份有限公司 | Method, device and base station for downlink beam forming |
| CN102355432B (en) * | 2011-08-12 | 2014-07-02 | 福建星网锐捷网络有限公司 | Method and base station for determining wireless message transmission rate |
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| EP1389834A1 (en) * | 2002-08-14 | 2004-02-18 | Siemens Aktiengesellschaft | Method to support channel estimation and corresponding base station |
| CN1481175A (en) * | 2002-08-06 | 2004-03-10 | ������������ʽ���� | Method for reporting transmitting channel quality between transmitter and receiver |
| WO2005062496A1 (en) * | 2003-12-22 | 2005-07-07 | Telefonaktiebolaget Lm Ericsson (Publ) | A method for determining transmit weights |
| CN1658526A (en) * | 2004-02-17 | 2005-08-24 | 大唐移动通信设备有限公司 | Down wave beam shaping method and device of radio channel |
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| CN1481175A (en) * | 2002-08-06 | 2004-03-10 | ������������ʽ���� | Method for reporting transmitting channel quality between transmitter and receiver |
| EP1389834A1 (en) * | 2002-08-14 | 2004-02-18 | Siemens Aktiengesellschaft | Method to support channel estimation and corresponding base station |
| WO2005062496A1 (en) * | 2003-12-22 | 2005-07-07 | Telefonaktiebolaget Lm Ericsson (Publ) | A method for determining transmit weights |
| CN1658526A (en) * | 2004-02-17 | 2005-08-24 | 大唐移动通信设备有限公司 | Down wave beam shaping method and device of radio channel |
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