CN101064556A - Method for obtaining downlink channel condition information based on intelligent antenna - Google Patents
Method for obtaining downlink channel condition information based on intelligent antenna Download PDFInfo
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- CN101064556A CN101064556A CN 200610074965 CN200610074965A CN101064556A CN 101064556 A CN101064556 A CN 101064556A CN 200610074965 CN200610074965 CN 200610074965 CN 200610074965 A CN200610074965 A CN 200610074965A CN 101064556 A CN101064556 A CN 101064556A
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Abstract
The invention discloses a method of obtaining down channel state information based on intelligent antenna that includes: A. the base station sends information which includes UE sending time and UE sending channel resource to user equipment UE which is connected to the system; B. the UE which do not transfer data to the base station via the channel resource distributed by said base station sends relative information to said base station according to time distributed by said base station; C. the base station calculates the down channel state information of the UE according to received relative information.
Description
Technical field
The present invention relates to the field of adopting intelligent antenna technology to communicate, relate in particular to a kind of method of obtaining downlink channel condition information based on smart antenna.
Background technology
TD-SCDMA system is unique employing time division duplex in three kinds of big international standards of 3-G (Generation Three mobile communication system), supports the transmission of up-downgoing non-symmetrical service, has bigger flexibility on spectrum utilization.This system synthesis adopts the advanced technology in the radio communications such as smart antenna, uplink synchronous, joint-detection and software radio, makes system have the higher performance and the availability of frequency spectrum.In the evolution scheme of TD-SCDMA system, in order to obtain the jumbo service of two-forty, need take wideer bandwidth, we can be referred to as broad band time division duplex honey comb system.In broad band time division duplex honey comb system, the transmission of data can adopt the OFDM mode to modulate, and transmits by smart antenna.In the evolution version of existing TD-SCDMA system, subscriber equipment (UE, User Equipment) receive frequency pilot sign from the base station after, can carry out channel measurement according to frequency pilot sign, and with the channel quality information reporting base station that measures, the base station can be carried out multi-subscriber dispatching according to the channel quality information that UE reports and be sent data.
But intelligent antenna technology is according to the residing orientation of subscriber equipment, and the wave beam that sends is carried out figuration, forms a directive wave beam of finite width, and the concentration of energy that is about to send arrives the direction of the subscriber equipment that receives data.The frequency pilot sign of smart antenna is directive, the subscriber equipment that only receives frequency pilot sign just the energy measurement down channel quality and with the downlink channel quality information reporting base station, other subscriber equipment is not owing to receive frequency pilot sign, and can't measure down channel quality also just can't be to the base station feedback downlink channel quality information.For the intelligent antenna technology that adopts based on the OFDM modulation system, how to allow the base station obtain in the sub-district not this problem of downlink channel condition information with the subscriber equipment of base station transmits data, the evolution scheme of existing TD-SCDMA system does not provide a concrete solution all the time.
Summary of the invention
In view of this, the present invention proposes and a kind ofly obtain the method for downlink channel condition information based on smart antenna, mainly the technical problem of Xie Jueing is to make the base station can obtain in the sub-district not downlink channel condition information with the UE of base station transmits data.
This method specifically comprises:
A, base station comprise that to the user equipment (UE) transmission of connecting system UE sends the time of information and the information that UE sends the used channel resource of information;
B, not with the UE of base station transmits data channel resource by described base station configuration, send relative information according to calling time on the described base station configuration to described base station;
C, base station go out the downlink channel condition information of this UE according to the associated information calculation of the described UE that receives.
Wherein, the time that UE sends information in the described steps A is arranged to periodically, or is arranged to the time that UE sends information acyclic.
Wherein, described UE sends relative information to the base station and is specially: UE is to the sign of base station pilot symbol transmitted and this UE.
Wherein, further comprise:
D11, base station are when UE transmission data, and the base station sends data and dedicated pilot symbol to described UE;
D12, UE carry out down channel according to the dedicated pilot symbol that receives and measure;
D13, UE send the downlink channel quality information that measures to the base station.
Wherein, the set-up mode of the dedicated pilot symbol that the base station sends among the described step D11 is:
On time-domain, dedicated pilot symbol takies a time slot, or takies a plurality of time slots;
On frequency domain, dedicated pilot symbol is placed on each subcarrier, or the experimental process carrier wave is placed at interval.
Wherein, the base station comprises to the mode that UE sends information in the described steps A: send or send by hint by broadcast transmission or by control information.
Wherein, the used channel resource of the transmission of the UE described in steps A information adopts piece resource mode to distribute.
Wherein, the information transmission mode between described base station and the UE adopts time division duplex.
Wherein, when transmitting information between described base station and the UE, the descending modulation system of base station adopts the OFDM modulation system.
Wherein, to send the time of information be that the base station dynamically generates to UE in the described steps A, or by manual configuration.
The invention has the beneficial effects as follows: the base station is provided with the subscriber equipment that adopts the smart antenna transmission data of modulating based on OFDM, this subscriber equipment will send the information relevant with self according to being provided with to the base station of base station, and the base station will obtain the downlink channel condition information of this subscriber equipment according to the relevant information of this subscriber equipment.Thereby solved base station in the prior art and can't obtain in the sub-district not problem with the downlink channel condition information of the subscriber equipment of base station transmits data.
Description of drawings
Fig. 1 is the flow chart of the embodiment of the invention 1.
Fig. 2 is the schematic diagram that sub-carrier resources is distributed by the piece resource.
Fig. 3 is the schematic diagram that dedicated pilot symbol is provided with.
Fig. 4 is the frame structure of TD-SCDMA system.
Embodiment
In the present invention, the base station is provided with the UE that adopts the smart antenna transmission data of modulating based on OFDM, this UE will being provided with to the base station pilot symbol transmitted according to the base station, the base station will calculate the downlink channel condition information of this UE according to the symmetry of time division duplex channel by the frequency pilot sign of this UE transmission.When this UE and base station transmits data, the base station can be carried out sending behind the wave beam forming to the data and the dedicated pilot symbol that will transmit according to the channel condition information of this UE.Below in conjunction with embodiment method of the present invention is further elaborated.
Referring to Fig. 1, the method for obtaining downlink channel condition information based on smart antenna comprises:
Behind the UE connecting system of employing based on the smart antenna transmission data of OFDM modulation system, uplink control channel resource is distributed for this UE in the base station, and notifies this UE periodically reporting status information of channel.By broadcasting, send control information or other hint method base stations will be distributed to the uplink control channel resource of UE, the channel resource of UE reporting status information of channel and the cycle that reports and send to UE.
Wherein, the base station is that the channel resource that UE distributes adopts the piece resource distribution mode, is used to transmit data and control signaling, and channel resource is indicated by transmission data resource sign.
Wherein, the piece resource distribution mode is meant, for the OFDM modulation system, band resource at first is divided into a plurality of time slots by the time, again the resource on the frequency domain is divided, on frequency domain, a plurality of adjacent sub-carrier channels are divided into one group, the resource of a group or a plurality of groups is given a UE, then the resource allocation of UE is the piece resource distribution mode, specifically as shown in Figure 2.In Fig. 2, on the frequency domain of OFDM, a plurality of subcarriers are formed a chunk resource (Chunk), and according to the bandwidth of OFDM, the whole system frequency band is divided into N Chunk, and wherein the piece resource of user's 1 distribution is Chunk 1 and Chunk N-1 two chunk resources.
Wherein, on cycle of calling time, mainly be that variation speed according to channel circumstance is by algorithm or manually dispose.Channel circumstance changes fast, and report cycle is short, otherwise report cycle is long.
UE judges whether to carry out transfer of data with the base station, for not with the data UE execution in step 103 of base station transmits, carry out from step 104 for UE with the base station transmits data backward.
Cycle that will be provided with according to the base station with the UE of base station transmits data not is periodically to the sign information such as (ID) of base station pilot symbol transmitted and UE.The base station will calculate the downlink channel condition information of this UE according to the symmetry of time division duplex channel by the frequency pilot sign of this UE transmission.
When the base station is adopted smart antenna to UE transmission data, will be according to the channel quality information of UE feedback, the quality of service (QoS of UE, Quality of Service) requirement and factors such as base station stored takes up room, fairness, determine next Transmission Time Interval (TTI, Transmission Time Interval) to need the UE of transmission data by fair scheduling algorithm.
The base station will send the form of data and shared information such as channel resource are notified UE by control information.This control information may send with data, also may send prior to data.
The base station is according to the quality of service requirement of the UE that will transmit data, and the decision of information such as channel quality sends the coded format and the modulation system of data to this UE.
The base station sends after with the data that send and dedicated pilot symbol wave beam forming.
Wherein, the method for dedicated pilot symbol setting is for being provided with two row dedicated pilot symbols in the descending time slot of a 0.675ms; In every row dedicated pilot symbol, per 4 subcarriers are placed a dedicated pilot symbol.Fig. 3 has provided the schematic diagram that described dedicated pilot symbol is provided with.
Wherein, dedicated pilot symbol is far away more at interval on time-domain, and then the maximum removable speed of UE is more little; Dedicated pilot symbol is far away more at interval on frequency domain, and then multidiameter is big more.
Wherein, downlink pilot frequency channel is used for the transmission of the dedicated pilot of system.(TS0～TS6) constitute with three special time slots, the frame structure form as shown in Figure 4 by 7 common time slots for each wireless sub-frame of existing TD-SCDMA system.Common time slot is used for transmitting data, and three special time slots are respectively downlink pilot frequency channel (DwPTS), ascending pilot channel (UpPTS) and translation and protection time slot (GP), and wherein, the pilot portion of data division and up-downgoing adopts same signal format.DwPTS is used for the transmission of the descending pilot frequency of system; UpPTS is used for inserting at random the transmission of user's ascending pilot frequency; GP is used to provide the time interval of descending sending time slots to up sending time slots conversion, and its length has determined the maximum of coverage radius of cell.
Wherein, wave beam forming is the key that can smart antenna be realized, relevant multiuser detection algorithm, wave beam switching criterion etc. all carry out around beam shaping.Because existing all kinds of algorithm computation amounts are big, convergence rate is slow, does not catch up with the rapid fading rate of change of moving user equipment and time varying channel, almost is difficult to reach the tracking to different user devices in the reality.In the reality, the wave beam switching modes that adopt accurate dynamic suboptimal switched-beam more, promptly accepting or transmitting terminal sets in advance the narrow beam of one group of different incident direction, again according to accepting or send the arrival angle of judging desired signal, according to certain signal errors criterion, in a plurality of wave beams that preset, choose an only wave beam, and switch to reception or transmission signal on this wave beam rapidly.
UE carries out channel measurement and estimation according to the dedicated pilot symbol that receives, and carries out coherent demodulation to receiving data, and physical layer process such as decoding will be separated the data that are in harmonious proportion after deciphering then and be reported high level.If receive correctly then be reported to high-rise the processing,, then carry out physical layer retransmission if make mistakes and surpass number of retransmissions.
The downlink channel quality information reporting base station that UE will measure and estimate to obtain.
Wherein, when the UE of base station and reporting channel quality information transmission data, the base station will send the coded format and the modulation system of data to this UE according to the decision of the channel quality information of this UE, and according to the channel condition information of this UE, to sending behind the data that send and the dedicated pilot symbol wave beam forming.
Among the embodiment 1, the base station makes not subscriber equipment with the base station transmits data periodically to the base station pilot symbol transmitted by setting, thereby allows the base station can periodically obtain the downlink channel condition information of this subscriber equipment.
In the actual conditions, by the setting of base station, the mode of subscriber equipment pilot symbol transmitted can have multiple, the base station also can dynamically be provided with subscriber equipment, make its aperiodicity pilot symbol transmitted, equally also can reach purpose of the present invention, just no longer repeat here for example to understand.
In the step 104 of embodiment 1, the base station is by the UE of the next transmission of fair scheduling algorithm decision data.
In the actual conditions, dispatching algorithm has multiple, for example: average dispatching algorithm, which kind of algorithm is maximum signal interference ratio dispatching algorithms etc. specifically adopt, and the base station will depend on the circumstances, and just no longer repeat here for example to understand.
In the step 106 of embodiment 1, the method for dedicated pilot symbol setting is for being provided with two row dedicated pilot symbols in the descending time slot of a 0.675ms; In every row dedicated pilot symbol, per 4 subcarriers are placed a dedicated pilot symbol.
In the actual conditions, the method for dedicated pilot symbol setting has multiple, usually is provided with according to the maximum removable speed of UE and to the requirement of multidiameter, and dedicated pilot symbol can be that row also can be multiple rows on time-domain; Can all place at each subcarrier on frequency domain, also the experimental process carrier wave is placed at interval, just no longer repeats here for example to understand.
Claims (10)
1, a kind ofly obtain the method for downlink channel condition information, it is characterized in that, comprising based on smart antenna:
A, base station comprise that to the user equipment (UE) transmission of connecting system UE sends the time of information and the information that UE sends the used channel resource of information;
B, not with the UE of base station transmits data channel resource by described base station configuration, send relative information according to calling time on the described base station configuration to described base station;
C, base station go out the downlink channel condition information of this UE according to the associated information calculation of the described UE that receives.
2, method according to claim 1 is characterized in that, the time that UE sends information in the described steps A is arranged to periodically, or is arranged to the time that UE sends information acyclic.
3, method according to claim 1 is characterized in that, described UE sends relative information to the base station and is specially: UE is to the sign of base station pilot symbol transmitted and this UE.
4, method according to claim 1 is characterized in that, further comprises:
D11, base station are when UE transmission data, and the base station sends data and dedicated pilot symbol to described UE;
D12, UE carry out down channel according to the dedicated pilot symbol that receives and measure;
D13, UE send the downlink channel quality information that measures to the base station.
5, method according to claim 4 is characterized in that, the set-up mode of the dedicated pilot symbol that the base station sends among the described step D11 is:
On time-domain, dedicated pilot symbol takies a time slot, or takies a plurality of time slots;
On frequency domain, dedicated pilot symbol is placed on each subcarrier, or the experimental process carrier wave is placed at interval.
6, method according to claim 1 is characterized in that, the base station comprises to the mode that UE sends information in the described steps A: send or send by hint by broadcast transmission or by control information.
7, method according to claim 1 is characterized in that, the UE described in the steps A sends the used channel resource of information and adopts piece resource mode to distribute.
According to any described method among the claim 1-7, it is characterized in that 8, the information transmission mode between described base station and the UE adopts time division duplex.
According to any described method among the claim 1-7, it is characterized in that 9, when transmitting information between described base station and the UE, the descending modulation system of base station adopts the OFDM modulation system.
10, method according to claim 1 is characterized in that, to send the time of information be that the base station dynamically generates to UE in the described steps A, or by manual configuration.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200610074965 CN101064556A (en) | 2006-04-25 | 2006-04-25 | Method for obtaining downlink channel condition information based on intelligent antenna |
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| CN 200610074965 CN101064556A (en) | 2006-04-25 | 2006-04-25 | Method for obtaining downlink channel condition information based on intelligent antenna |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011020258A1 (en) * | 2009-08-19 | 2011-02-24 | 中兴通讯股份有限公司 | Method and equipment for reporting channel state information aperiodically |
| CN102934381A (en) * | 2010-06-02 | 2013-02-13 | 三星电子株式会社 | Method and system for transmitting channel state information in wireless communication systems |
| CN109565521A (en) * | 2016-08-12 | 2019-04-02 | 高通股份有限公司 | The technology obtained for the channel state information in new radio technology |
-
2006
- 2006-04-25 CN CN 200610074965 patent/CN101064556A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011020258A1 (en) * | 2009-08-19 | 2011-02-24 | 中兴通讯股份有限公司 | Method and equipment for reporting channel state information aperiodically |
| US8559328B2 (en) | 2009-08-19 | 2013-10-15 | Zte Corporation | Method and device for reporting channel state information aperiodically |
| CN102934381A (en) * | 2010-06-02 | 2013-02-13 | 三星电子株式会社 | Method and system for transmitting channel state information in wireless communication systems |
| US9270439B2 (en) | 2010-06-02 | 2016-02-23 | Samsung Electronics Co., Ltd. | Method and system for transmitting channel state information in wireless communication systems |
| CN102934381B (en) * | 2010-06-02 | 2016-04-06 | 三星电子株式会社 | For the method and system of transmitting channel state information in wireless communication system |
| CN109565521A (en) * | 2016-08-12 | 2019-04-02 | 高通股份有限公司 | The technology obtained for the channel state information in new radio technology |
| US11018745B2 (en) | 2016-08-12 | 2021-05-25 | Qualcomm Incorporated | Techniques for channel state information acquisition in new radio technology |
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Address after: 201612 Shanghai City, Songjiang Caohejing Xuhui District hi tech park Xinzhuan Highway No. 518, building 6, room 101 Applicant after: Shanghai Ultimate Power Communication Technology Co., Ltd. Address before: 201700 Shanghai city Qingpu District No. 599 new road, building 3, No. 103 Applicant before: Shanghai Ultimate Power Communication Technology Co., Ltd. |
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Address after: 201612 Shanghai Caohejing Songjiang hi tech park Xinzhuan Highway No. 518, building 6, room 101 Applicant after: Shanghai Ultimate Power Communication Technology Co., Ltd. Address before: 201612 Shanghai City, Songjiang Caohejing Xuhui District hi tech park Xinzhuan Highway No. 518, building 6, room 101 Applicant before: Shanghai Ultimate Power Communication Technology Co., Ltd. |
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Application publication date: 20071031 |