CN102724726A - Method and device for switching multiple input multiple output (MIMO) mode in transmission mode (TM8) in long-term evolution (LTE) system - Google Patents
Method and device for switching multiple input multiple output (MIMO) mode in transmission mode (TM8) in long-term evolution (LTE) system Download PDFInfo
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Abstract
The invention discloses a method and device for switching a multiple input multiple output (MIMO) mode in a transmission mode (TM8) in a long-term evolution (LTE) system, which are used for realizing the function that a terminal which does not support alternate antenna transmission can perform accurate switching at the MIMO mode switching time points and also for reducing the complexity of the MIMO mode switching. The method comprises the following steps of: judging the current MIMO mode, acquiring the intra-mode switching parameters of the current MIMO mode, judging that the intra-mode switching parameters meet the first preset conditions corresponding to the current MIMO mode, and when the virtual executing frequency of the MIMO mode corresponding to the current MIMO mode meets the second preset conditions, switching the MIMO mode in the TM8. Therefore, the terminal which does not support alternate antenna transmission can perform accurate switching at the corresponding time point, and the complexity of the MIMO mode switching process is reduced.
Description
Technical field
The present invention relates to the multi-antenna technology field, the square law device that the MIMO mode is switched in the TM8 in the particularly a kind of LTE system.
Background technology
In recent years, along with the sharp increase of communication apparatus to the information technology demand, communication apparatus proposes higher requirement to the transmission rate and the transmission performance of wireless communication system.But because the scarcity of radio spectrum resources, wireless communication system will reach higher transmission rate and better transmission property, just needs wireless communication system must have higher spectrum efficiency.From present technical development; MIMO (Multiple Input Multiple Output; Multiple-input, multiple-output) a plurality of antennas of techniques make use are realized MIMO; On limited frequency spectrum resources, can realize two-forty and big capacity, fully develop space resources, in the new generation of wireless communication system, play the part of important role.
In LTE (Long Term Evolution, Long Term Evolution) system, can adopt the MIMO technology to improve channel capacity, increase system reliability.Wherein, a kind of MIMO mode often only is applicable to a kind of fixing channel scene, and for example, the closed-loop MIMO technology is applicable to the scene that movement velocity is low; The open loop MIMO technology is applicable to the scene that movement velocity is high; Single current wave beam forming transmission means can only be sent a data flow simultaneously, can guarantee the signal to noise ratio of receiving terminal, is applicable to the scene that channel relevancy is weak, signal to noise ratio is low; The dual-stream beamforming transmission means can be sent two incoherent data flow simultaneously, can improve power system capacity, is applicable to the scene that channel relevancy is strong, signal to noise ratio is high.
In the wireless environment of reality, because the continuous variation in portable terminal geographical position, portable terminal channel situation of living in is also in continuous variation, and at this moment, if adopt single MIMO mode, system is difficult to be operated in state efficiently.So, having defined multiple transmission mode and MIMO mode in the LTE system, transmission mode and MIMO mode can self adaptation be switched according to the feedback information of UE (User Equipment, user terminal) to different channel statuss in the base station.Adaptive technique can be selected the MIMO mode according to factors such as channel conditions, type of service, numbers of users.When channel conditions is good, adopt the dual-stream beamforming transmission means can obtain higher efficiency of transmission; When channel conditions is abominable, adopt single current wave beam forming transmission means can obtain laser propagation effect preferably.Compare with adopting fixed mode multi-antenna technology, adaptive technique has higher flexibility, and can obtain better system performance.Following is the transmission mode in the LTE R9 system:
Transmission mode 8 in the LTE R9 system is that TM8 is a kind of transmission mode of closed loop; Basic principle is to utilize the heterogeneite of up-downgoing channel; Through uplink SRS (Sounding Reference Signal; Survey and use reference signal) channel estimation value generate the received signal to noise ratio of directed towards user figuration vector with the raising user, thereby improve user's receptivity.Transmission mode 8 exists three kinds of MIMO modes, single current wave beam forming transmission means, dual-stream beamforming transmission means and transmission diversity.Single current wave beam forming transmission means is mainly used in eNB (evolved Node B, evolved base station) configuration 8 antennas or 4+4 dual polarized antenna, the scene that user channel quality is relatively poor; The dual-stream beamforming transmission means is mainly used in eNB and disposes 8 antennas or 4+4 dual polarized antenna, and user channel quality is scene preferably; And the transmission diversity of rank=1 is mainly used in the rollback mode of switching between pattern.The switching of the MIMO mode in the LTE R9 system in transmission mode 8 patterns relates generally to the self adaptation switching of single current wave beam forming and dual-stream beamforming.
At present; The single current wave beam forming transmission means in the LTE R9 system in transmission mode 8 patterns and the adaptive method for switching of dual-stream beamforming transmission means are: the channel estimation value that measures according to uplink SRS calculates single current wave beam forming transmission means and the corresponding equivalent signal-to-noise ratio of dual-stream beamforming transmission means respectively; Utilize the equivalent signal-to-noise ratio of single current wave beam forming transmission means and dual-stream beamforming transmission means to estimate to obtain single current wave beam forming transmission means and dual-stream beamforming transmission means capacity corresponding or throughput then respectively, from single current wave beam forming transmission means and dual-stream beamforming transmission means capacity corresponding or throughput, select the MIMO mode of the bigger MIMO mode of throughput or capacity at last as this selection.Consult shown in Figure 1ly, at present the concrete performing step of the self adaptation switching of single current wave beam forming transmission means in transmission mode 8 patterns and dual-stream beamforming transmission means is following in the LTE R9 system:
Step 10: the channel estimation value that measures according to uplink SRS calculates single current wave beam forming transmission means and the corresponding equivalent signal-to-noise ratio of dual-stream beamforming transmission means respectively.
The corresponding equivalent signal-to-noise ratio of single current wave beam forming transmission means and dual-stream beamforming transmission means is designated as SINR1 respectively
EffAnd SINR21
Eff, SINR22
Eff
Wherein, SINR1
EffThe equivalent signal-to-noise ratio of expression single current wave beam forming transmission means, SINR21
EffThe corresponding equivalent signal-to-noise ratio of first data flow of expression dual-stream beamforming transmission means, SINR22
EffThe corresponding equivalent signal-to-noise ratio of second data flow of expression dual-stream beamforming transmission means.
Step 20: calculate the capacity or the throughput of the transmission of single current wave beam forming transmission means and dual-stream beamforming transmission means according to single current wave beam forming transmission means and the corresponding equivalent signal-to-noise ratio of dual-stream beamforming transmission means.
The capacity of the transmission of single current wave beam forming transmission means and dual-stream beamforming transmission means or throughput are designated as C1 respectively
EffAnd C2
Eff
Wherein, C1
EffThe capacity or the throughput of the transmission of expression single current wave beam forming transmission means, C2
EffThe capacity or the throughput of the transmission of expression dual-stream beamforming transmission means:
C1
Eff=f (SINR1
Eff) (formula one)
C2
Eff=f (SINR21
Eff)+f (SINR22
Eff) (formula two)
In the formula, the function of capacity or throughput is asked in f (g) expression.
Step 30: compare the capacity of single current wave beam forming transmission means and dual-stream beamforming transmission means transmission or the size of throughput, select the MIMO mode according to comparative result.
If C2
Eff≤C1
Eff, the capacity of expression single current wave beam forming transmission means transmission or throughput then adopt the MIMO mode of single current wave beam forming transmission means greater than the capacity or the throughput of the transmission of dual-stream beamforming transmission means; If C1
Eff≤C2
Eff, the capacity of expression dual-stream beamforming transmission means transmission or throughput then adopt the MIMO mode of dual-stream beamforming transmission means greater than the capacity or the throughput of the transmission of single current wave beam forming transmission means.
At present, there are following problem in the single current wave beam forming transmission means in transmission mode 8 patterns and the adaptive method for switching of dual-stream beamforming transmission means in the LTE R9 system:
1, the prerequisite of using the SRS channel estimation value to calculate the equivalent signal-to-noise ratio of single current wave beam forming transmission means and dual-stream beamforming transmission means correspondence respectively is that the base station must obtain the channel estimation value of 2*8.But under portable terminal was supported situation that antenna sends in turn, the base station just can obtain the channel estimation value of 2*8, and in agreement antenna to send in turn be optional, rather than essential, therefore, the base station also might obtain the channel estimation value of 1*8.If the channel estimation value of 1*8 is had in the base station, will there be bigger error in single current wave beam forming transmission means that the channel estimation value of use 1*8 calculates and the corresponding equivalent signal-to-noise ratio of dual-stream beamforming transmission means;
2, when calculating the equivalent signal-to-noise ratio of single current wave beam forming transmission means and dual-stream beamforming transmission means correspondence, need to calculate equivalent channel state information corresponding on each subcarrier, calculate equivalent signal-to-noise ratio then; If 96 PRB of a CU (Physical Resource Block; Physical Resource Block), on the PRB 12 number of sub-carrier is arranged, so just need to calculate 96*12=1152 signal to noise ratio; The execution complexity is higher, is unfavorable for practical implementation.
Summary of the invention
The embodiment of the invention provides method and the device that the MIMO modes are switched in the transmission mode 8 in a kind of LTE system; Can not accurately switch in order to solve the terminal of not supporting antenna to send in turn that exists in the present MIMO mode changing method, and MIMO mode handoff procedure complicated problems.
The concrete technical scheme that the embodiment of the invention provides is following:
The method that the MIMO modes are switched in the transmission mode 8 in a kind of LTE system comprises:
In the process of using transmission mode 8, when each setting-up time point arrives, judge the current MIMO mode of this time point that arrives;
Obtain the intra-mode handover parameter of current MIMO mode;
It is corresponding with current MIMO mode first pre-conditioned to judge that said intra-mode handover parameter satisfies, and the virtual execution number of times of the MIMO mode relative with current MIMO mode satisfied second carries out transmission mode 8 interior MIMO modes and switches when pre-conditioned.
MIMO mode device for switching in the transmission mode 8 in a kind of LTE system comprise:
Judging unit is used in the process of using transmission mode 8, when each setting-up time point arrives, judges the current MIMO mode of this time point that arrives;
Acquiring unit is used to obtain the intra-mode handover parameter of current MIMO mode;
Switch unit; It is corresponding with current MIMO mode first pre-conditioned to be used to judge that said intra-mode handover parameter satisfies; And the virtual execution number of times of the MIMO mode relative with current MIMO mode satisfies second when pre-conditioned, and the MIMO modes of carrying out in the transmission mode 8 are switched.
In the embodiment of the invention; At the some switching time of MIMO mode; Judge to arrive the current MIMO mode of this time point, obtain the intra-mode handover parameter of current MIMO mode then, it is corresponding with current MIMO mode first pre-conditioned that determinating mode intra parameter satisfies; And the virtual execution number of times of the MIMO mode relative with current MIMO mode satisfies second when pre-conditioned; The MIMO modes of carrying out in the transmission mode 8 are switched, thus realized not supporting terminal that antenna sends in turn switching time point can accurately switch the MIMO mode, and reduced the complexity of the handoff procedure of MIMO mode.
Description of drawings
Fig. 1 is the single current wave beam forming transmission means in the transmission mode 8 and the switching flow figure of dual-stream beamforming transmission means in the LTE R9 system under the prior art;
Fig. 2 be in the embodiment of the invention in LTE R9 system the MIMO mode device for switching structure chart in the transmission mode 8;
Single current wave beam forming transmission means in the transmission mode 8 and the switching flow figure of dual-stream beamforming transmission means in the LTE R9 system in Fig. 3 embodiment of the invention.
Embodiment
For LTE R9 system, put and accurately to switch in the switching time of MIMO mode in order to realize the terminal of not supporting antenna to send in turn, and reduce the complexity of the handoff procedure of MIMO mode; In the embodiment of the invention; At the some switching time of MIMO mode, judge the current MIMO mode of this time point that arrives, then; Obtain the intra-mode handover parameter of current MIMO mode; Satisfy corresponding with current MIMO mode first pre-conditionedly in determinating mode intra parameter, and under the pre-conditioned situation of the virtual execution number of times of the MIMO mode relative satisfied second, carry out transmission mode 8 interior MIMO modes and switch with current MIMO mode; Thereby realized not supporting antenna to put and accurately to switch in the switching time of MIMO mode in the terminal of transmission in turn, and reduced the complexity of the handoff procedure of MIMO mode.
Below in conjunction with accompanying drawing the preferred embodiment of the present invention is elaborated.
Consult shown in Figure 2ly, in the embodiment of the invention, the MIMO mode device for switching in the LTE R9 system in the transmission mode 8 comprise: judging unit 21, acquiring unit 22 and switch unit 23, wherein,
Judging unit 21 is used in the process of using transmission mode 8, when each setting-up time point arrives, judges the current MIMO mode of this time point that arrives;
Acquiring unit 22 is used to obtain the intra-mode handover parameter of current MIMO mode;
Switch unit 23; It is corresponding with current MIMO mode first pre-conditioned to be used to judge that said intra-mode handover parameter satisfies; And the virtual execution number of times of the MIMO mode relative with current MIMO mode satisfies second when pre-conditioned, and the MIMO modes of carrying out in the transmission mode 8 are switched.
Based on technique scheme, to consult shown in Figure 3ly, in the embodiment of the invention, in the transmission mode 8 of LTE R9 system, the detailed process that the MIMO mode is switched is following:
Step 300: in the process of using transmission mode 8, in the time point of setting, the MIMO mode that base station judges is current.
In the process of the transmission mode 8 in using LTE R9 system; The base station can be provided with the switching cycle of single current wave beam forming transmission means and dual-stream beamforming transmission means; The base station is according to the cycle of setting; At each time corresponding point, judge that according to the sign of the MIMO mode of storing arriving the current MIMO mode of this time point is single current wave beam forming transmission means or dual-stream beamforming transmission means.
Step 310: the base station obtains the intra-mode handover parameter of current MIMO mode.
In the embodiment of the invention; If the terminal does not support antenna to send in turn, then when execution in step 310, the base station is at the some switching time of MIMO mode; Obtain the spectral efficiency values of current MIMO mode and the Bler of accumulation (Block Error Ratio; Block Error Rate) value is specially: if confirm that current MIMO mode is a single current wave beam forming transmission means, then obtain the spectral efficiency values of single current wave beam forming transmission means and the Bler value of accumulation; If confirm that current MIMO mode is the dual-stream beamforming transmission means, then obtain the spectral efficiency values of dual-stream beamforming transmission means and the Bler value of accumulation.
In the embodiment of the invention; If the terminal supports antenna to send in turn; Then when execution in step 310, the base station obtains the spectral efficiency values of current MIMO mode and the Bler value of accumulation at the some switching time of MIMO mode; And the dominant eigenvalue and the sub-eigenvalue that calculate according to the SRS measurement result; Be specially:, then obtain the spectral efficiency values of single current wave beam forming transmission means and the Bler value of accumulation, and obtain dominant eigenvalue and the sub-eigenvalue that calculates according to the SRS measurement result if confirm that current MIMO mode is a single current wave beam forming transmission means; If confirm that current MIMO mode is the dual-stream beamforming transmission means, then obtain the spectral efficiency values of dual-stream beamforming transmission means and the Bler value of accumulation, and obtain dominant eigenvalue and the sub-eigenvalue that calculates according to the SRS measurement result.
In order to improve the accuracy of spectral efficiency values, preferable, the base station is revised the spectral efficiency values of obtaining through CQI (Channel Quality Indicator, CQI) correction algorithm, guarantees the accuracy and the validity of spectral efficiency values.
Step 320: whether the intra-mode handover parameter of the current MIMO mode that base station judges is obtained satisfies with current MIMO mode corresponding first pre-conditioned, if satisfy first pre-conditionedly, then execution in step 330; If satisfied first is pre-conditioned, do not do any operation.
A, to single current wave beam forming transmission means, the concrete executive mode of step 320 is following:
In the embodiment of the invention; Under not supporting situation that antenna sends in turn at the terminal; The base station is at the some switching time of MIMO mode, and when confirming that current MIMO mode is single current wave beam forming transmission means, it is first as follows pre-conditioned that base station determinating mode intra parameter need satisfy:
1) under the single current wave beam forming transmission means spectral efficiency values of single code word more than or equal to the corresponding spectrum efficiency threshold value of single current wave beam forming transmission means;
2) under the single current wave beam forming transmission means accumulation Bler value of single code word less than with the corresponding Bler threshold value of single current wave beam forming transmission means.
In the embodiment of the invention; The spectral efficiency values that single code word under the single current wave beam forming transmission means can be judged in the base station whether more than or equal to the corresponding spectrum efficiency threshold value of single current wave beam forming transmission means; Preferable, the spectral efficiency values that also can judge single code word under the revised single current wave beam forming transmission means whether more than or equal to the corresponding spectrum efficiency threshold value of single current wave beam forming transmission means.
In practical application; Each data flow is used a code word, and promptly single current wave beam forming transmission means is used a code word, and the dual-stream beamforming transmission means is used two code words; Wherein, A code word is corresponding with a spectral efficiency values, and simultaneously, a code word is also corresponding with the Bler value of an accumulation.
Under not supporting situation that antenna sends in turn at the terminal, if when above two conditions satisfy simultaneously, the base station is with execution in step 330; If when having at least a condition not satisfy in above two conditions, any processing is not done in the base station, execution in step 330.
Under the situation that terminal support antenna sends in turn, when execution in step 330 is wanted in the base station, except will satisfying above two conditions, also need satisfy following condition simultaneously:
3) dominant eigenvalue and the ratio of sub-eigenvalue are less than corresponding ratio threshold value.
In practical application; Dominant eigenvalue and sub-eigenvalue can be calculated according to the SRS measurement result in the base station, and for example, the base station is carried out SVD (Singular Value Decompostion according to SRS to the correlation matrix of channel; Singular value decomposition method) decomposes, and then calculate dominant eigenvalue and sub-eigenvalue.
Under the situation that terminal support antenna sends in turn, when satisfying simultaneously as if above three conditions, the base station is with execution in step 330; If when having at least a condition not satisfy in above three conditions, any processing is not done in the base station, execution in step 330.
B, to the dual-stream beamforming transmission means, the concrete executive mode of step 320 is following:
Under not supporting situation that antenna sends in turn at the terminal; In the embodiment of the invention; The base station is at the some switching time of MIMO mode, and when confirming that current MIMO mode is the dual-stream beamforming transmission means, it is first as follows pre-conditioned that base station determinating mode intra parameter need satisfy:
1) the minimal frequency efficiency value in following two code words of the dual-stream beamforming transmission means spectral efficiency values separately is smaller or equal to the spectrum efficiency threshold value corresponding with the dual-stream beamforming transmission means; And/or,
2) the Bler value of the cumulative maximum in the Bler value of following two the code word accumulations separately of dual-stream beamforming transmission means is greater than the Bler threshold value of correspondence
In practical application; Each data flow is used a code word, and promptly single current wave beam forming transmission means is used a code word, and the dual-stream beamforming transmission means is used two code words; Wherein, A code word is corresponding with a spectral efficiency values, and simultaneously, a code word is also corresponding with the Bler value of an accumulation.
Under not supporting situation that antenna sends in turn at the terminal, if when having at least a condition to satisfy in above two conditions, the base station is with execution in step 330; If when any one condition in above two conditions did not satisfy, any processing was not done in the base station.
Under supporting situation that antenna sends in turn at the terminal, can adopt other a kind of mode whether to judge execution in step 330, judge promptly whether following three conditions satisfy one of them or combination in any:
1) the minimal frequency efficiency value in following two code words of the dual-stream beamforming transmission means spectral efficiency values separately is smaller or equal to the spectrum efficiency threshold value corresponding with the dual-stream beamforming transmission means; And/or,
2) the Bler value of the cumulative maximum in the Bler value of following two the code word accumulations separately of dual-stream beamforming transmission means is greater than the Bler threshold value of correspondence
3) dominant eigenvalue and the ratio of sub-eigenvalue are more than or equal to corresponding ratio threshold value
In practical application, dominant eigenvalue and sub-eigenvalue can be calculated according to the SRS measurement result in the base station, and for example, the base station is carried out SVD according to SRS to the correlation matrix of channel and decomposed, and then calculates dominant eigenvalue and sub-eigenvalue.
Under supporting situation that antenna sends in turn at the terminal, if when having at least a condition to satisfy in above three conditions, the base station is with execution in step 330; If when any one condition in above three conditions did not satisfy, any processing was not done in the base station, execution in step 330.
Step 330: it is second pre-conditioned whether the virtual execution number of times of the MIMO mode that base station judges and current MIMO mode are relative satisfies, and satisfying under the second pre-conditioned situation execution in step 340; Not satisfying under the second pre-conditioned situation, still adopt current MIMO mode.
In the embodiment of the invention; At the some switching time of MIMO mode; When the base station confirmed that current MIMO mode is single current wave beam forming transmission means, it is second as follows pre-conditioned that the virtual execution number of times of the dual-stream beamforming transmission means relative with single current wave beam forming transmission means need satisfy:
The virtual execution number of times of the dual-stream beamforming transmission means relative with single current wave beam forming transmission means is more than or equal to corresponding number of times threshold value.
If above condition is set up, then execution in step 340; If above condition is false, then still adopt single current wave beam forming transmission means, do not switch to the dual-stream beamforming transmission means.
In the embodiment of the invention; At the some switching time of MIMO mode; When the base station confirmed that current MIMO mode is the dual-stream beamforming transmission means, it is second as follows pre-conditioned that the virtual execution number of times of the single current wave beam forming transmission means relative with the dual-stream beamforming transmission means need satisfy:
The virtual execution number of times of the single current wave beam forming transmission means relative with the dual-stream beamforming transmission means is more than or equal to corresponding number of times threshold value.
If above condition is set up, then execution in step 340; If above condition is false, then still adopt the dual-stream beamforming transmission means, do not switch to single current wave beam forming transmission means.
Step 340: the MIMO mode of carrying out in the transmission mode 8 is switched.
If current MIMO mode is a single current wave beam forming transmission means, then the MIMO mode is switched to the wave beam forming transmission means from single current wave beam forming transmission means, the relevant parameter zero clearing; If current MIMO mode is the dual-stream beamforming transmission means, then the MIMO mode is switched to single current wave beam forming transmission means, relevant parameter zero clearing from the dual-stream beamforming transmission means.
In the embodiment of the invention; Time point when the base station at MIMO mode switching cycle; When confirming that current transmission means is single current wave beam forming transmission means, the MIMO mode is switched to the dual-stream beamforming transmission means from single current wave beam forming transmission means, and with the Bler value zero clearing of accumulating.
In the embodiment of the invention; Time point when the base station at MIMO mode switching cycle; When confirming that current transmission means is the dual-stream beamforming transmission means, the MIMO mode is switched to single current wave beam forming transmission means from the dual-stream beamforming transmission means, and with the Bler value zero clearing of accumulating.
In sum; At the some switching time of MIMO mode; Judge to arrive the current MIMO mode of this time point, obtain the intra-mode handover parameter of current MIMO mode then, it is corresponding with current MIMO mode first pre-conditioned that determinating mode intra parameter satisfies; And the virtual execution number of times of the MIMO mode relative with current MIMO mode satisfies second when pre-conditioned; The MIMO mode of carrying out in the transmission mode 8 is switched, thereby has realized not supporting antenna can accurately switch at time corresponding point at the terminal of transmission in turn, and has reduced the complexity of the handoff procedure of MIMO mode.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (16)
1. the method that multiple-input, multiple-output MIMO modes are switched in the transmission mode 8 in the Long Term Evolution LTE system is characterized in that, comprising:
In the process of using transmission mode 8, when each setting-up time point arrives, judge the current MIMO mode of this time point that arrives;
Obtain the intra-mode handover parameter of current MIMO mode;
It is corresponding with current MIMO mode first pre-conditioned to judge that said intra-mode handover parameter satisfies, and the virtual execution number of times of the MIMO mode relative with current MIMO mode satisfied second carries out transmission mode 8 interior MIMO modes and switches when pre-conditioned.
2. the method for claim 1 is characterized in that, the duration between adjacent two setting-up time points is identical.
3. according to claim 1 or claim 2 method is characterized in that the said intra-mode handover parameter of obtaining current MIMO mode comprises:
When definite terminal does not support that antenna sends in turn, obtain the spectral efficiency values of current MIMO mode and the Block Error Rate Bler value of accumulation.
4. method as claimed in claim 3; It is characterized in that; It is corresponding with current MIMO mode first pre-conditioned to judge that said intra-mode handover parameter satisfies; And the virtual execution number of times of MIMO of the MIMO mode relative with current MIMO mode satisfies second when pre-conditioned, switches to the dual-stream beamforming transmission means, comprising:
When definite current MIMO mode is single current wave beam forming transmission means; Judge that the spectral efficiency values of single code word under the single current wave beam forming transmission means is more than or equal to the Bler value of the spectrum efficiency threshold value of correspondence, the accumulation Bler threshold value less than correspondence; And the virtual execution number of times of the dual-stream beamforming transmission means relative with single current wave beam forming transmission means switches to the dual-stream beamforming transmission means from single current wave beam forming transmission means during more than or equal to corresponding number of times threshold value.
5. method as claimed in claim 3; It is characterized in that; It is corresponding with current MIMO mode first pre-conditioned to judge that said intra-mode handover parameter satisfies; And the corresponding virtual execution number of times of MIMO of current MIMO mode satisfies second when pre-conditioned, switches to single current wave beam forming transmission means, comprising:
When definite current MIMO mode is the dual-stream beamforming transmission means; Minimal frequency efficiency value in judgement following two code words of the dual-stream beamforming transmission means spectral efficiency values separately is smaller or equal to the spectrum efficiency threshold value of correspondence, and/or the cumulative maximum Bler value in two code words accumulation Bler value separately is greater than the Bler threshold value of correspondence; And the virtual execution number of times of the single current wave beam forming transmission means relative with the dual-stream beamforming transmission means switches to single current wave beam forming transmission means from the dual-stream beamforming transmission means during more than or equal to corresponding number of times threshold value.
6. according to claim 1 or claim 2 method is characterized in that the said intra-mode handover parameter of obtaining current MIMO mode comprises:
When definite terminal supports that antenna sends in turn, obtain the spectral efficiency values of current MIMO mode and the Bler value of accumulation, and according to surveying dominant eigenvalue and the sub-eigenvalue that calculates with reference signal SRS measurement result.
7. method as claimed in claim 6; It is characterized in that; It is corresponding with current MIMO mode first pre-conditioned to judge that said intra-mode handover parameter satisfies; And the virtual execution number of times of the MIMO mode relative with current MIMO mode satisfies second when pre-conditioned, switches to the dual-stream beamforming transmission means, comprising:
When definite current MIMO mode is single current wave beam forming transmission means; The spectral efficiency values of judging single code word under the single current wave beam forming transmission means more than or equal to the Bler value of the spectrum efficiency threshold value of correspondence, the accumulation of single code word less than the ratio of the Bler threshold value of correspondence, dominant eigenvalue and sub-eigenvalue less than corresponding ratio threshold value; And the virtual execution number of times of the dual-stream beamforming transmission means relative with single current wave beam forming transmission means switches to the dual-stream beamforming transmission means from single current wave beam forming transmission means during more than or equal to corresponding number of times threshold value.
8. method as claimed in claim 6; It is characterized in that; It is corresponding with current MIMO mode first pre-conditioned to judge that said intra-mode handover parameter satisfies; And the virtual execution number of times of the MIMO mode relative with current MIMO mode satisfies second when pre-conditioned, switches to single current wave beam forming transmission means, comprising:
When definite current MIMO mode is the dual-stream beamforming transmission means; Minimal frequency efficiency value in judgement following two code words of the dual-stream beamforming transmission means spectral efficiency values separately is smaller or equal to the spectrum efficiency threshold value of correspondence; Cumulative maximum Bler value in two code words accumulation Bler value separately is greater than the Bler threshold value of correspondence, and dominant eigenvalue satisfies a kind of or combination in any with the ratio of sub-eigenvalue more than or equal to these three conditions of corresponding ratio threshold value; And the virtual execution number of times of the single current wave beam forming transmission means relative with the dual-stream beamforming transmission means switches to single current wave beam forming transmission means from the dual-stream beamforming transmission means during more than or equal to corresponding number of times threshold value.
9. multiple-input, multiple-output MIMO mode device for switching in the transmission mode 8 in the Long Term Evolution LTE system is characterized in that, comprising:
Judging unit is used in the process of using transmission mode 8, when each setting-up time point arrives, judges the current MIMO mode of this time point that arrives;
Acquiring unit is used to obtain the intra-mode handover parameter of current MIMO mode;
Switch unit; It is corresponding with current MIMO mode first pre-conditioned to be used to judge that said intra-mode handover parameter satisfies; And the virtual execution number of times of the MIMO mode relative with current MIMO mode satisfies second when pre-conditioned, and the MIMO modes of carrying out in the transmission mode 8 are switched.
10. device as claimed in claim 9 is characterized in that, the duration between adjacent two setting-up time points is identical.
11., it is characterized in that acquiring unit specifically is used for if the terminal does not support antenna to send in turn like claim 9 or 10 described devices, obtain current MIMO mode spectral efficiency values and the Block Error Rate Bler value of accumulation.
12. device as claimed in claim 11; It is characterized in that; Switch unit; When specifically being used for current MIMO mode and being single current wave beam forming transmission means; Judge the spectral efficiency values of single code word under the single current wave beam forming transmission means more than or equal to the Bler value of the spectrum efficiency threshold value of correspondence, accumulation Bler threshold value, and the virtual execution number of times of the dual-stream beamforming transmission means relative with single current wave beam forming transmission means switches to the dual-stream beamforming transmission means from single current wave beam forming transmission means during more than or equal to corresponding number of times threshold value less than correspondence.
13. device as claimed in claim 11; It is characterized in that; Switch unit when specifically being used for current MIMO mode and being the dual-stream beamforming transmission means, judges that minimal frequency efficiency value in following two code words of the dual-stream beamforming transmission means spectral efficiency values separately is smaller or equal to the spectrum efficiency threshold value of correspondence; And/or the cumulative maximum Bler value in two code words accumulation Bler value separately is greater than the Bler threshold value of correspondence; And the virtual execution number of times of the single current wave beam forming transmission means relative with the dual-stream beamforming transmission means switches to single current wave beam forming transmission means from the dual-stream beamforming transmission means during more than or equal to corresponding number of times threshold value.
14., it is characterized in that acquiring unit specifically is used for like claim 9 or 10 described devices
If the terminal supports antenna to send in turn, obtain the spectral efficiency values of current MIMO mode and the Bler value of accumulation, and according to surveying dominant eigenvalue and the sub-eigenvalue that calculates with reference signal SRS measurement result.
15. device as claimed in claim 14; It is characterized in that; Switch unit; When specifically being used for current MIMO mode and being single current wave beam forming transmission means; Judge the spectral efficiency values of single code word under the single current wave beam forming transmission means more than or equal to the Bler value of the spectrum efficiency threshold value of correspondence, accumulation less than the ratio of the Bler threshold value of correspondence, dominant eigenvalue and sub-eigenvalue less than corresponding ratio threshold value, and the virtual execution number of times of the dual-stream beamforming transmission means relative with single current wave beam forming transmission means switches to the dual-stream beamforming transmission means from single current wave beam forming transmission means during more than or equal to corresponding number of times threshold value.
16. device as claimed in claim 14; It is characterized in that; Switch unit; When specifically being used for current MIMO mode and being single current wave beam forming transmission means; Minimal frequency efficiency value in judgement following two code words of the dual-stream beamforming transmission means spectral efficiency values separately is smaller or equal to the spectrum efficiency threshold value of correspondence, and the cumulative maximum Bler value in two code words accumulation Bler value separately is greater than the Bler threshold value of correspondence, and dominant eigenvalue satisfies a kind of or combination in any with the ratio of sub-eigenvalue more than or equal to these three conditions of corresponding ratio threshold value; And the virtual execution number of times of the single current wave beam forming transmission means relative with the dual-stream beamforming transmission means switches to single current wave beam forming transmission means from the dual-stream beamforming transmission means during more than or equal to corresponding number of times threshold value.
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