Method and device for selecting data transmitting mode in multiantenna technology
Method and device for selecting data transmitting mode in multiantenna technology
 CN 102,237,909 A
 Filed: 04/28/2010
 Published: 11/09/2011
 Est. Priority Date: 04/28/2010
 Status: Active Application
First Claim
1. the system of selection of data transmission modes in the multiantenna technology is characterized in that, comprising:
 In the judgement cycle of data transmission modes, transmitting terminal is added up the channel condition information of current receiving terminal;
AndSelection in predetermined many antenna datas sending mode is suitable for the data transmission modes of described current receiving terminal according to the described channel condition information of adding up, and described predetermined many antenna datas sending mode comprises following at least two;
wave beam forming BF, space diversity wave beam forming SD+BF, spatial reuse wave beam forming SM+BF, cyclic delay diversity CDD, space diversity cyclic delay diversity SD+CDD, spatial reuse cyclic delay diversity SM+CDD.
Chinese PRB Reexamination
Abstract
The invention discloses a method and device for selecting a data transmitting mode in a multiantenna technology, belonging to the field of wireless communication. The method comprises the following steps of: in the judgment period of a data transmitting mode, counting the channel state information of a current receiving end by using a transmitting end; and selecting a data transmitting mode which is suitable for the current receiving end from preset multiantenna data transmitting modes according to the counted channel state information. Due to the adoption of the method and the device, data are transmitted to the current receiving end in a selected data transmitting mode, the link stability can be enhanced, and the system throughput can be increased.

3 Citations
No References
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21 Claims

1. the system of selection of data transmission modes in the multiantenna technology is characterized in that, comprising:

In the judgement cycle of data transmission modes, transmitting terminal is added up the channel condition information of current receiving terminal;
AndSelection in predetermined many antenna datas sending mode is suitable for the data transmission modes of described current receiving terminal according to the described channel condition information of adding up, and described predetermined many antenna datas sending mode comprises following at least two;
wave beam forming BF, space diversity wave beam forming SD+BF, spatial reuse wave beam forming SM+BF, cyclic delay diversity CDD, space diversity cyclic delay diversity SD+CDD, spatial reuse cyclic delay diversity SM+CDD.


2. method according to claim 1 is characterized in that, selects data transmission modes to comprise according to the described channel condition information of statistics:
According to the Ns of statistics and the magnitude relationship of Num, from closed loop correlation technique or open loop correlation technique, select the data transmission modes of a data sending mode as described active user;
One of wherein, Ns is the statistic of channel condition information, and Num is the statistic threshold value, below described closed loop correlation technique comprises at least;
BF, SD+BF or SM+BF;
One of below described open loop correlation technique comprises at least;
CDD, SD+CDD or SM+CDD.

3. method according to claim 2 is characterized in that described channel condition information is the weights correlations, adds up described weights correlation and comprises:

Steps A;
the previous weights correlation of initialization WR _{Pre}=α
, wherein, α
is the constant greater than 0;
The described judgement cycle is the T frame;
Obtain first weights W in the described judgement cycle _{1}Ns=0;
Step B;
, in present frame, obtain second weights W according to the time sequencing of frame _{2}Calculate the current weight correlation R of described current receiving terminal _{Cur}= W _{1}^{H}* W _{2}, wherein, H is the conjugate transpose of matrix,  W _{1}^{H}* W _{2} representing matrix W _{1}^{H}* W _{2}Norm;
Upgrading described previous weights correlation is WR _{Pre}=ρ
R _{Pre}+ (1ρ
) R _{Cur}, ρ
is constant and 0≤
ρ
≤
1, with described second weights W _{2}Value compose to described W _{1}If WR _{Pre}〉
=T _{r}, Ns adds 1 with statistic, and Tr is first threshold value;
Repeat described step B, until described judgement end cycle or Ns 〉
=Num.


4. method according to claim 2 is characterized in that described channel condition information comprises the weights distance, adds up described weights distance and comprises:

Steps A;
the previous weights distance D of initialization _{Pre}=α
, wherein, α
is the constant greater than 0;
Obtain first weights W in the frame in the described judgement cycle _{1}, the described judgement cycle is the T frame;
Ns=0;
Step B;
in a followup frame, obtain second weights W _{2}Calculate the current weight distance D of described current receiving terminal _{Cur}=d (W _{1}, W _{2}), wherein, d (W _{1}, W _{2}) be one of following formula;
d(W _{1}，
W _{2})＝
λ
_{max}(W _{1}W _{1}^{H}W _{2}W _{2}^{H})，


5. method according to claim 1 is characterized in that, described channel condition information comprises the signal to noise ratio CINR under the current data sending mode, wrong rate BER or the spatial coherence sent out;
 Select data transmission modes to comprise according to the described channel condition information of statistics;
to select multiplexing correlation technique or diversity correlation technique according to the signal to noise ratio CINR under the current data sending mode of statistics, the wrong rate BER of sending out or spatial coherence;One of below described multiplexing correlation technique comprises at least;
SM+BF, SM+CDD;
One of below described diversity correlation technique comprises at least;
BF, SD+BF, CDD or SD+CDD.
 Select data transmission modes to comprise according to the described channel condition information of statistics;

6. method according to claim 5 is characterized in that described channel condition information comprises spatial coherence, and described spatial coherence is by the conditional number of channel correlation matrix Expression;
 Select data transmission modes to comprise according to the described channel condition information of statistics;
the conditional number of calculating channel correlation matrix With described conditional number With the 5th threshold value Compare, if Select multiplexing correlation technique;
If Select the diversity correlation technique.
 Select data transmission modes to comprise according to the described channel condition information of statistics;

7. method according to claim 6 is characterized in that, described conditional number Calculating comprise:

Steps A;
the previous channel relevancy matrix of initialization R _{Pre}Step B;
, calculate current receiving terminal and in frame structure, be used for channel relevancy matrix on the carrier set of calculating channel correlation matrix according to time sequencing;
Wherein, N _{c}Represent to comprise on the described carrier set number of carrier wave, And α
_{k}〉
=0 is respectively the channel coefficient matrix and the proportionality coefficient of k subcarrier in the described carrier set, h _{Ij}(k) channel coefficients that is j root transmitting antenna to k the carrier wave between i root reception antenna, j=1 ..., M, i=1 ..., N, M are actual physics transmitting antenna number or virtualantenna number, N is the reception antenna number;
Upgrading described previous channel relevancy matrix is R _{Pre}=ρ
R _{Pre}+ (1ρ
) R, ρ
is constant and 0≤
ρ
≤
1;
In the described judgement cycle, repeat this step, until described judgement end cycle;
Step C;
the conditional number of calculating previous channel relevancy matrix;
Wherein, f is preferably one of following formula;
Perhaps f (R _{Pre})=λ
_{Min}(R _{Pre});
Wherein, tr (R _{Pre}) representing matrix R _{Pre}Mark, subscript H represents matrix is asked conjugate transpose, λ
_{Max}(R _{Pre}), λ
_{Min}(R _{Pre}) be respectively matrix R _{Pre}Minimum and maximum characteristic value.


8. method according to claim 6 is characterized in that, if Select the diversity correlation technique to comprise:
 if Select multithread diversity correlation technique, wherein It is the 4th threshold value;
If Select single current diversity correlation technique;
Wherein, described multithread diversity correlation technique comprises SD+BF and/or SD+CDD;
Described single current diversity correlation technique comprises BF and/or CDD.
 if Select multithread diversity correlation technique, wherein It is the 4th threshold value;

9. method according to claim 5 is characterized in that, described channel condition information is the wrong rate BER of sending out;
 Select data transmission modes to comprise according to the described channel condition information of statistics;
In the described judgement cycle, obtain described mistake and send out rate BER;
If BER＜
BER _{0}, select multiplexing correlation technique, if BER 〉
=BER _{0}, select the diversity correlation technique, BER _{0}For mistake is sent out the rate thresholding.
 Select data transmission modes to comprise according to the described channel condition information of statistics;

10. method according to claim 5 is characterized in that, described channel condition information is the signal to noise ratio CINR under wrong rate BER of sending out and the current data sending mode;
 Select data transmission modes to comprise according to the described channel condition information of statistics;
When described current receiving terminal uses the diversity correlation technique, obtain the signal to noise ratio CINR of described current receiving terminal, if CINR＞
SD_TH1, described SD_TH1 is the signalnoise ratio threshold value, then select multiplexing correlation technique, if CINR≤
SD_TH1 then selects the diversity correlation technique;When described current receiving terminal uses multiplexing correlation technique, in the described judgement cycle, obtain described mistake and send out rate BER;
If BER＜
BER _{0}, select multiplexing correlation technique, if BER 〉
=BER _{0}, select the diversity correlation technique, BER _{0}For mistake is sent out the rate thresholding.
 Select data transmission modes to comprise according to the described channel condition information of statistics;

11. according to each described method of claim 610, it is characterized in that the unit in described judgement cycle is a frame, in the described judgement cycle, be provided with L judgement constantly, described L is the integer greater than 0, selects data transmission modes to comprise according to the described channel condition information of statistics:

In each judgement constantly, select the step of data transmission modes to select multiplexing correlation technique or diversity correlation technique according to each described described channel condition information of claim 610 according to statistics; When selecting the diversity correlation technique, the number of times SD_NUM of diversity correlation technique is added 1, until described judgement end cycle or SD_NUM/L 〉
=Tr_SD, Tr_SD is the diversity threshold value;If SD_NUM/L 〉
=Tr_SD selects the diversity correlation technique, otherwise, multiplexing correlation technique selected.


12. according to each described method of claim 610, it is characterized in that the unit in described judgement cycle is a frame, in the described judgement cycle, be provided with L judgement constantly, described L is the constant greater than 0, selects data transmission modes to comprise according to the described channel condition information of statistics:

In each judgement constantly, select the step of data transmission modes to select multiplexing correlation technique or diversity correlation technique according to each described described channel condition information of claim 610 according to statistics; When selecting multiplexing correlation technique, the number of times SM_NUM of multiplexing correlation technique is added 1, until described judgement end cycle or SM_NUM/L 〉
=Tr_SM, Tr_SM is multiplexing threshold value;If SM_NUM/L 〉
=Tr_SM selects multiplexing correlation technique, otherwise, the diversity correlation technique selected.


13. method according to claim 1 is characterized in that, described method also comprises:
 each data transmission modes corresponding data transmission rate under the different modulating coded system is sorted, form Speedometer Drive;
Select data transmission modes to comprise according to the described channel condition information of statistics;
, in described Speedometer Drive, to select multiplexing correlation technique or diversity correlation technique according to described data transmission rate trend according to the channel condition information judgment data transmission rate trend of statistics;Described multiplexing correlation technique comprises;
SM+BF and/or SM+CDD;
One of below described diversity correlation technique comprises at least;
BF, SD+BF, CDD or SD+CDD.
 each data transmission modes corresponding data transmission rate under the different modulating coded system is sorted, form Speedometer Drive;

14. method according to claim 13 is characterized in that, described channel condition information comprises the wrong rate BER of sending out, and described channel condition information judgment data transmission rate trend according to statistics comprises:

The described judgement cycle is divided into a plurality of designated period, in each described designated period, calculates described mistake and send out rate BER, add up BER≤
BER in the described judgement cycle _{0}Or 1BER 〉
=BER _{0}Times N _{s}, described BER _{0}For mistake is sent out the rate threshold value;
If N _{s}≤
N _{1}, determine that then described data transmission rate trend is for descending described N _{1}It is the 6th threshold value;
If N _{s}〉
=N _{2}, determine that then described data transmission rate trend is for rising described N _{2}It is the 7th threshold value;
If N _{1}＜
N _{s}＜
N _{2}, determine that then described data transmission rate trend is constant.


15. method according to claim 14 is characterized in that, calculates described mistake and send out rate BER and comprise in each described designated period:
Calculate BER=M _{Rep}/ M _{Total}, wherein, M _{Total}Be the total number of the burst in described designated period, M _{Rep}For the mixing in described designated period retransmits HARQ automatically or retransmits the burst number that first of AQR retransmits automatically.

16. method according to claim 14 is characterized in that, calculates described mistake and send out rate BER and comprise in each described designated period:
Calculate BER=B _{Rep}/ B _{Total}, wherein, B _{Total}Be the total number M of the burst in described designated period _{Total}Corresponding bit number, B _{Rep}For in described designated period, mixing the first burst number M that retransmits that retransmits HARQ automatically or retransmit AQR automatically _{Rep}Corresponding bit number.

17. method according to claim 13 is characterized in that, described channel condition information comprises the signal to noise ratio CINR under the current data sending mode;
 Described channel condition information judgment data transmission rate trend according to statistics comprises;
A plurality of judgements are set constantly in the described judgement cycle, when each is adjudicated, engrave the CINR that obtains under the current data sending mode successively;
And add up described accent and adjudicate CINR 〉
=CINR in the phase _{0}Times N _{s}, described CINR _{0}Be the signalnoise ratio threshold value;
If N _{s}≤
N _{1}, determine that then described data transmission rate trend is for descending described N _{1}It is the 6th threshold value;
If N _{s}〉
=N _{2}, determine that then described data transmission rate trend is for rising described N _{2}It is the 7th threshold value;
If N _{1}＜
N _{s}＜
N _{2}, determine that then described data transmission rate trend is constant.
 Described channel condition information judgment data transmission rate trend according to statistics comprises;

18. according to the arbitrary described method of claim 1417, it is characterized in that, describedly in described Speedometer Drive, select multiplexing correlation technique or diversity correlation technique to comprise according to described data transmission rate trend:

If data transmission rate trend is for rising, selecting the pattern of a data transmission rate correspondence between current data transmission rate and peak transfer rate is diversity correlation technique or multiplexing correlation technique; If data transmission rate trend is for descending, selecting the pattern of a data transmission rate correspondence between current data transmission rate and minimum defeated speed is diversity correlation technique or multiplexing correlation technique; If data transmission rate trend is constant, keep current data transmission modes constant.


19. according to each described method of claim 310,1317, it is characterized in that, select data transmission modes to comprise according to the described channel condition information of statistics:

Described channel condition information according to statistics determines to select closed loop correlation technique or open loop correlation technique according to described claim 3 or 4 methods that provide earlier in described predetermined many antenna datas sending mode;
One of below described closed loop correlation technique comprises at least;
BF, SD+BF or SM+BF;
One of below described open loop correlation technique comprises at least;
CDD, SD+CDD or SM+CDD;When selecting described closed loop correlation technique, judge whether to select the first diversity correlation technique or the first multiplexing correlation technique in the described closed loop correlation technique according to arbitrary described method among described claim 6,7,910, the 1317;
The described first diversity correlation technique comprises BF or SD+BF;
The described first multiplexing correlation technique is SM+BF;When selecting described open loop correlation technique, judge whether to select the second diversity correlation technique or the second multiplexing correlation technique in the described open loop correlation technique according to arbitrary described method among described claim 6,7,910, the 1317;
The described second diversity correlation technique comprises CDD or SD+CDD;
The described second multiplexing correlation technique is SM+CDD;When selecting the described first diversity correlation technique or the second diversity correlation technique, determine to select multithread diversity correlation technique or single current diversity correlation technique according to the method that described claim 8 provides;
Described multithread diversity correlation technique comprises SD+BF or SD+CDD;
Described single current diversity correlation technique comprises BF or CDD.


20. according to each described method of claim 310,1317, it is characterized in that, select data transmission modes to comprise according to the described channel condition information of statistics:

One of in described predetermined many antenna datas sending mode, determine to select diversity correlation technique or multiplexing correlation technique according to arbitrary described method among described claim 6,7,910, the 1317 earlier according to the described channel condition information of adding up, below described diversity correlation technique comprises at least;
BF, SD+BF, CDD or SD+CDD;
One of below described multiplexing correlation technique comprises at least;
SM+BF or SM+CDD;When selecting described diversity correlation technique, described claim 3 or 4 methods that provide judge whether to select the first closed loop correlation technique or the first open loop correlation technique in the described diversity correlation technique, and it is one of following at least that the described first closed loop correlation technique comprises;
BF, SD+BF;
One of below the described first open loop correlation technique comprises at least;
CDD or SD+CDD;When selecting described multiplexing correlation technique, described claim 3 or 4 methods that provide judge whether to select the second closed loop correlation technique or the second open loop correlation technique in the described multiplexing correlation technique, and the described second closed loop correlation technique is SM+BF;
The described second open loop correlation technique is SM+CDD;When selecting the described first closed loop correlation technique or the first open loop correlation technique, determine to select multithread diversity correlation technique or single current diversity correlation technique according to the method that described claim 8 provides;
Described multithread diversity correlation technique comprises SD+BF or SD+CDD;
Described single current diversity correlation technique comprises BF or CDD.


21. the choice device of data transmission modes is characterized in that in the multiantenna technology, comprising:

Statistical module was used for adding up the channel condition information of current receiving terminal in the judgement cycle of data transmission modes; Select module, be used for being suitable in predetermined many antenna datas sending mode selection the data transmission modes of described current receiving terminal according to the described channel condition information of described statistical module counts;
Described predetermined many antenna datas sending mode comprises following at least two;
wave beam forming BF, space diversity wave beam forming SD+BF, spatial reuse wave beam forming SM+BF, cyclic delay diversity CDD, space diversity cyclic delay diversity SD+CDD or spatial reuse cyclic delay diversity SM+CDD.

Specification(s)