CN102916733A - Method and base station for virtual antenna mapping phase regulation - Google Patents
Method and base station for virtual antenna mapping phase regulation Download PDFInfo
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Abstract
The invention provides a method and a base station for virtual antenna mapping phase regulation. The method for virtual antenna mapping phase regulation includes determining quantity of multiple-input multiple-output MIMO terminals; if the quantity is higher than a preset threshold, then in multiple virtual antenna VAM(virtual access method) phases, generating throughput corresponding to each VAM phase according to at least two pieces of first-channel quality indicting information reported from each MIMO terminal corresponding to each VAM phase and second-channel quality indicting information reported from at least one non-MIMO terminal; and determining the VAM phase corresponding to the maximum throughput and regulating deviation angle of the current VAM phase to the determined VAM phase. By the method and the base station for virtual antenna mapping phase regulation, dynamic regulation of the deviation angle of the VAM phase is realized, and performance of a communication system is improved.
Description
Technical field
The present invention relates to wireless communication technology, relate in particular to a kind of virtual-antenna mapping phase adjusting method and base station.
Background technology
In wireless communication system, transmitter can utilize a plurality of transmitting antennas to send data to the receiver with a plurality of reception antennas, a plurality of transmitting antennas have enough become multiple-input and multiple-output (Multiple-Input Multiple-Out-put with reception antenna, MIMO) channel is used for improving downlink throughput capacity.
Be scheduling to example with the MIMO double fluid, in the scheduling of MIMO double fluid, mainly adopt major-minor pilot tone mode, send by two antennas.Non-MIMO conventional terminal is when initial designs, consideration for cost, enable space-time emission diversity STTD(Space Time TransmitDiversity in the MIMO residential quarter) during function, the balanced reception machine will be closed, thereby cause the hydraulic performance decline of non-MIMO conventional terminal.For fear of in MIMO, using the STTD pattern, simultaneously also in order to take full advantage of the power of the power amplifier on two branch roads of MIMO base station side, introduced VAM(Virtual Antenna Mapping on the basis of original MIMO, the virtual-antenna mapping).But in the prior art, the VAM phase place is fixed, and can not for the MIMO terminal of each communication system and the concrete condition of non-MIMO, cause the downlink throughput capacity of residential quarter to reduce.
Summary of the invention
The invention provides a kind of virtual-antenna mapping phase adjusting method and base station, to realize the dynamic adjustment at VAM phase deviation angle, improve the performance of communication system.
One aspect of the present invention provides a kind of virtual-antenna mapping phase adjusting method, comprising:
Determine the quantity of multiple-input and multiple-output MIMO terminal;
If described quantity surpasses predetermined threshold value, then in a plurality of virtual-antennas mapping VAM phase places, according to generating throughput corresponding to each described VAM phase place corresponding at least two the first channel quality indication (CQI) informations of each described MIMO terminal to report of each described VAM phase place and the second channel quality indication (CQI) information of at least one non-MIMO terminal to report.
Determine the VAM phase place corresponding to maximum of described throughput, definite VAM phase place is adjusted at current VAM phase deviation angle.
Another aspect of the present invention provides a kind of base station, comprising:
The quantity determination module is for the quantity of determining multiple-input and multiple-output MIMO terminal;
The first processing module, surpass predetermined threshold value if be used for described quantity, then in a plurality of virtual-antenna mapping VAM phase places, according to corresponding at least two the first channel quality indication (CQI) informations of each described MIMO terminal to report of each described VAM phase place and the second channel quality indication (CQI) information of at least one non-MIMO terminal to report, generate throughput corresponding to each described VAM phase place;
Adjusting module for VAM phase place corresponding to maximum of determining described throughput, is adjusted to definite VAM phase place with current VAM phase deviation angle.
Virtual-antenna mapping phase adjusting method provided by the invention and base station, determine the quantity of multiple-input and multiple-output MIMO terminal, if quantity surpasses predetermined threshold value, then in a plurality of virtual-antenna mapping VAM phase places, according to corresponding at least two the first channel quality indication (CQI) informations of each MIMO terminal to report of each VAM phase place and the second channel quality indication (CQI) information of at least one non-MIMO terminal to report, generate throughput corresponding to each VAM phase place, determine the VAM phase place corresponding to maximum of throughput, definite VAM phase place is adjusted at current VAM phase deviation angle.Can determine the VAM phase place according to the channel conditions of the MIMO terminal of reality and the channel conditions of non-MIMO terminal, realized the dynamic adjustment at VAM phase deviation angle, and when this VAM phase place is adjusted to current VAM phase deviation angle in the base station, the downlink throughput capacity of residential quarter is maximum, has greatly improved the performance of communication system.
Description of drawings
A kind of virtual-antenna mapping phase adjusting method flow chart that Fig. 1 provides for the embodiment of the invention;
The another kind of virtual-antenna mapping phase adjusting method flow chart that Fig. 2 provides for the embodiment of the invention;
A kind of architecture of base station schematic diagram that Fig. 3 provides for the embodiment of the invention;
The another kind of architecture of base station schematic diagram that Fig. 4 provides for the embodiment of the invention.
Embodiment
A kind of virtual-antenna mapping phase adjusting method flow chart that Fig. 1 provides for the embodiment of the invention.As shown in Figure 1, the virtual-antenna mapping phase adjusting method that present embodiment provides specifically can be applied to the base station to the adjustment process at virtual-antenna mapping VAM phase deviation angle, can carry out by the base station.The virtual-antenna mapping phase adjusting method that this enforcement provides specifically comprises:
Particularly, may both exist the MIMO terminal also to have non-MIMO terminal in a plurality of subscriber equipmenies that communicate with the base station, the base station with the reciprocal process of subscriber equipment in can know that this subscriber equipment is also right and wrong MIMO terminal of MIMO terminal, the quantity of the MIMO terminal of statistics within a period of time.
If step 20 quantity surpasses predetermined threshold value, then in a plurality of virtual-antenna mapping VAM phase places, according to corresponding at least two the first channel quality indication (CQI) informations of each MIMO terminal to report of each VAM phase place and the second channel quality indication (CQI) information of at least one non-MIMO terminal to report, generate throughput corresponding to each VAM phase place;
Particularly, when the quantity of MIMO terminal surpasses predetermined threshold value, in to the adjustment process at VAM phase deviation angle, consider simultaneously the channel conditions of MIMO terminal and the channel conditions of non-MIMO terminal.VAM phase deviation angle can be adjusted to some VAM phase places in the base station, can start the time that a counter is determined this VAM phase preserving.Under this VAM phase place, the base station receives at least two the first channel quality indication (CQI) informations (Channel Quality Indication of each MIMO terminal to report, be called for short CQI), each MIMO terminal has at least two antennas, and the MIMO terminal reports a CQI by each antenna.The base station receives the 2nd CQI of at least one non-MIMO terminal to report, and non-MIMO terminal has an antenna, and non-MIMO terminal reports the 2nd CQI by this antenna.The base station can generate throughput according at least two CQI of each MIMO terminal to report and the 2nd CQI of at least one non-MIMO terminal to report, and this throughput is the downlink throughput capacity of residential quarter.Another VAM phase place is adjusted to VAM phase deviation angle again in the base station, and calculates throughput under this VAM phase place by above-mentioned identical mode.
A plurality of VAM phase places can be selected arbitrarily in this enforcement, and optimal way is to select uniformly in a preset range, and from the angle of probability, this selection mode can make deviate less, thereby as much as possible near desirable VAM phase angle.For instance, the initial phase with the VAM phase place is made as i* π/3 first, and the span of i is 1,2 ..., 6, start simultaneously counter, to the retention time counting of this VAM phase place.After this VAM phase place comes into force, generate throughput according at least two the first channel quality indication (CQI) informations of each MIMO terminal to report and the second channel quality indication (CQI) information of at least one non-MIMO terminal to report.After this counter finishes, i is added 1, then repeat above process.When i=6, travel through 6 phase places that are over.When dynamically adjusting the VAM phase place, number of times and the step-length between the phase place of adjustment can be set as required, are not limited with present embodiment.
The virtual-antenna mapping phase adjusting method that present embodiment provides, determine the quantity of multiple-input and multiple-output MIMO terminal, if quantity surpasses predetermined threshold value, then in a plurality of virtual-antenna mapping VAM phase places, according to corresponding at least two the first channel quality indication (CQI) informations of each MIMO terminal to report of each VAM phase place and the second channel quality indication (CQI) information of at least one non-MIMO terminal to report, generate throughput corresponding to each VAM phase place, determine the VAM phase place corresponding to maximum of throughput, definite VAM phase place is adjusted at current VAM phase deviation angle.Can determine the VAM phase place according to the channel conditions of the MIMO terminal of reality and the channel conditions of non-MIMO terminal, realized the dynamic adjustment at VAM phase deviation angle, and when this VAM phase place is adjusted to current VAM phase deviation angle in the base station, the downlink throughput capacity of residential quarter is maximum, has greatly improved the performance of communication system.
In the present embodiment, step 20, in a plurality of virtual-antenna mapping VAM phase places, according to corresponding at least two the first channel quality indication (CQI) informations of each MIMO terminal to report of each VAM phase place and the second channel quality indication (CQI) information of at least one non-MIMO terminal to report, generate throughput corresponding to each VAM phase place, specifically can comprise:
For each VAM phase place, calculate current VAM phase deviation angle when being the VAM phase place, the second average of the second channel quality indication (CQI) information of the first average of at least two the first channel quality indication (CQI) informations of each MIMO terminal to report and Ge Fei MIMO terminal to report is according to the first average and the second average generation throughput.
Be scheduling to example with MIMO terminal double fluid, the MIMO terminal mainly adopts major-minor pilot tone mode, carries out reporting of a CQI by two antennas, and a CQI who reports is respectively dominant pilot CQI
11With guidance frequency CQI
21, the dominant pilot CQI of MIMO terminal
11Send by the dominant pilot antenna, teach frequently CQI
21Antenna sends by teaching frequently.The 2nd CQI of non-MIMO terminal to report is specially dominant pilot CQI
12, dominant pilot CQI
12Send by the dominant pilot antenna.
Calculate the dominant pilot CQI of each MIMO terminal to report by following formula
11With guidance frequency CQI
21The first average:
Wherein, N is the quantity of MIMO terminal, and the first average can reflect the average channel quality of each MIMO terminal.
Calculate the dominant pilot CQI of each non-MIMO terminal to report by following formula
12The second average:
Wherein, M is the quantity of non-MIMO terminal, and the second average can reflect the average channel quality of each non-MIMO terminal.
Downlink throughput capacity by following formula calculation plot:
Particularly, can be directly with the first average and the second average and as this throughput, also the first average and the second average can be multiply by respectively default coefficient, obtain this throughput after the summation again.Default coefficient specifically can be determined according to the quantity of the MIMO terminal in the system and non-MIMO terminal.
When the quantity of MIMO terminal and non-MIMO terminal is in a plurality of situations, come the calculation plot throughput by MIMO terminal and non-MIMO terminal average channel quality separately, considered the normal performance shake of communication system, so that the performance of communication system is more stable.
The another kind of virtual-antenna mapping phase adjusting method flow chart that Fig. 2 provides for the embodiment of the invention.As shown in Figure 2, in the present embodiment, step 10 is determined after the quantity of multiple-input and multiple-output MIMO terminal, and step 30 determines that the method can also comprise before VAM phase place corresponding to the maximum of throughput:
Particularly, if the quantity of MIMO terminal is no more than predetermined threshold value, illustrate that the MIMO terminal in the present system is few, then can not consider the channel conditions of MIMO terminal.The priority of each non-MIMO terminal can arrange, not be limited with present embodiment according to service quality (Quality of Service the is called for short QoS) information of non-MIMO terminal.The base station generates throughput according to the second channel quality indication of non-MIMO terminal to report and the priority of non-MIMO terminal, and determines the VAM phase place accordingly, can guarantee the downstream rate of high-priority users.
In the present embodiment, step 40 according to corresponding to the second channel quality indication (CQI) information of each non-MIMO terminal to report of each VAM phase place and the priority of Ge Fei MIMO terminal, generates throughput corresponding to each VAM phase place, specifically can comprise:
For each VAM phase place, priority according to non-MIMO terminal, when current VAM phase deviation angle is the VAM phase place, the second channel quality indication (CQI) information of each non-MIMO terminal to report is divided into a plurality of priority groups, and the weight of definite each priority groups, calculate the mean value of the second channel quality indication (CQI) information of each priority groups, generate throughput according to the mean value of each priority groups and the weight of each priority groups.
Particularly, for example the quantity of non-MIMO terminal is M, is divided into to be s priority, priority is that the quantity of 1 non-MIMO terminal is m1, priority is that the quantity of 2 non-MIMO terminal is m2, and priority is that the quantity of the non-MIMO terminal of s is ms, and m1+m2+ ... + ms=M.Weight corresponding to each priority is respectively w
1, w
2..., w
sA is adjusted to VAM phase deviation angle in the base station
iThe time, by following formula calculate throughput:
Particularly, can be directly with the product of the weight of the mean value of the second channel quality indication (CQI) information of each priority groups and each priority groups as this throughput, also can process as the basis take this product and generate this throughput.
In the present embodiment, step 40 is obtained the priority of each non-MIMO terminal, specifically can comprise:
Obtain the quality of service information of each non-MIMO terminal, determine the priority of each non-MIMO terminal according to the quality of service information of each non-MIMO terminal.
Particularly, the quality of service information QoS that returns according to non-MIMO terminal, by (the Radio Resource Management of the RRM in the base station, abbreviation RRM) device is mapped as base priority with class of service in the qos parameter and class of subscriber, has so just obtained the priority of each non-MIMO terminal.In the present embodiment, the subscriber equipment of different priorities is arranged corresponding weight, the cell throughout that obtains can guarantee the speed of high-priority users more near real situation, has guaranteed simultaneously the high-speed cruising of whole network.
A kind of architecture of base station schematic diagram that Fig. 3 provides for the embodiment of the invention.As shown in Figure 3, each step of the virtual-antenna mapping phase adjusting method that any embodiment of the present invention provides specifically can be realized in the base station that present embodiment provides, and does not repeat them here.The base station that present embodiment provides specifically comprises quantity determination module 111, the first processing module 112 and adjusting module 114.Quantity determination module 111 is used for determining the quantity of MIMO terminal.If the first processing module 112 is used for quantity and surpasses predetermined threshold value, then in a plurality of virtual-antenna mapping VAM phase places, according to corresponding at least two the first channel quality indication (CQI) informations of each MIMO terminal to report of each VAM phase place and the second channel quality indication (CQI) information of at least one non-MIMO terminal to report, generate throughput corresponding to each VAM phase place.Adjusting module 114 is used for determining the VAM phase place corresponding to maximum of throughput, and definite VAM phase place is adjusted at current VAM phase deviation angle.
The base station that present embodiment provides, quantity determination module 111 is determined the quantity of MIMO terminal, if the first processing module 112 quantity surpass predetermined threshold value, then in a plurality of virtual-antenna mapping VAM phase places, according to corresponding at least two the first channel quality indication (CQI) informations of each MIMO terminal to report of each VAM phase place and the second channel quality indication (CQI) information of at least one non-MIMO terminal to report, generate throughput corresponding to each VAM phase place, adjusting module 114 is determined the VAM phase place corresponding to maximum of throughput, and definite VAM phase place is adjusted at current VAM phase deviation angle.Can determine the VAM phase place according to the channel conditions of the MIMO terminal of reality and the channel conditions of non-MIMO terminal, realized the dynamic adjustment at VAM phase deviation angle, and when this VAM phase place is adjusted to current VAM phase deviation angle in the base station, the downlink throughput capacity of residential quarter is maximum, has greatly improved the performance of communication system.
The another kind of architecture of base station schematic diagram that Fig. 4 provides for the embodiment of the invention.As shown in Figure 4, in the present embodiment, the first processing module 112 can also be used for for each VAM phase place, calculate current VAM phase deviation angle when being the VAM phase place, the second average of the second channel quality indication (CQI) information of the first average of at least two the first channel quality indication (CQI) informations of each MIMO terminal to report and Ge Fei MIMO terminal to report is according to the first average and the second average generation throughput.
During by the first average and the second average generation throughput, consider simultaneously MIMO terminal and non-MIMO terminal, when the MIMO terminal in the system is more, can improve the downlink throughput capacity of residential quarter.
In the present embodiment, further, this base station can also comprise the second processing module 113, if the second processing module 113 is used for quantity and is no more than predetermined threshold value, then obtain the priority of each non-MIMO terminal, according to corresponding to the second channel quality indication (CQI) information of each non-MIMO terminal to report of each VAM phase place and the priority of Ge Fei MIMO terminal, generate throughput corresponding to each VAM phase place.
Consider the priority of non-MINO terminal during the calculation plot throughput, can guarantee high-priority users downlink transfer speed.
In the present embodiment, the second processing module 113 can also be used for for each VAM phase place, priority according to non-MIMO terminal, when current VAM phase deviation angle is the VAM phase place, the second channel quality indication (CQI) information of each non-MIMO terminal to report is divided into a plurality of priority groups, and determine the weight of each priority groups, and calculate the mean value of the second channel quality indication (CQI) information of each priority groups, generate throughput according to the mean value of each priority groups and the weight of each priority groups.Subscriber equipment to different priorities arranges corresponding weight, and the cell throughout that obtains can guarantee the speed of high-priority users more near real situation, has guaranteed simultaneously the high-speed cruising of whole network.
In the present embodiment, the second processing module 113 can also be used for obtaining the quality of service information of each non-MIMO terminal, determines the priority of each non-MIMO terminal according to the quality of service information of each non-MIMO terminal.
It should be noted that at last: above each embodiment is not intended to limit only in order to technical scheme of the present invention to be described; Although with reference to aforementioned each embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps some or all of technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a virtual-antenna mapping phase adjusting method is characterized in that, comprising:
Determine the quantity of multiple-input and multiple-output MIMO terminal;
If described quantity surpasses predetermined threshold value, then in a plurality of virtual-antenna mapping VAM phase places, according to corresponding at least two the first channel quality indication (CQI) informations of each described MIMO terminal to report of each described VAM phase place and the second channel quality indication (CQI) information of at least one non-MIMO terminal to report, generate throughput corresponding to each described VAM phase place;
Determine the VAM phase place corresponding to maximum of described throughput, definite VAM phase place is adjusted at current VAM phase deviation angle.
2. virtual-antenna according to claim 1 shines upon phase adjusting method, it is characterized in that, described in a plurality of virtual-antenna mapping VAM phase places, according to corresponding at least two the first channel quality indication (CQI) informations of each described MIMO terminal to report of each described VAM phase place and the second channel quality indication (CQI) information of at least one non-MIMO terminal to report, generate throughput corresponding to each described VAM phase place, comprising:
For each described VAM phase place, calculate current VAM phase deviation angle when being described VAM phase place, the second average of the first average of at least two the first channel quality indication (CQI) informations of each described MIMO terminal to report and the second channel quality indication (CQI) information of each described non-MIMO terminal to report is according to described the first average and the described throughput of described the second average generation.
3. virtual-antenna according to claim 1 mapping phase adjusting method is characterized in that, after the quantity of described definite multiple-input and multiple-output MIMO terminal, before VAM phase place corresponding to the described maximum of determining described throughput, described method also comprises:
If described quantity is no more than predetermined threshold value, then obtain the priority of each described non-MIMO terminal, according to corresponding to the second channel quality indication (CQI) information of each described non-MIMO terminal to report of each described VAM phase place and the priority of each described non-MIMO terminal, generate throughput corresponding to each described VAM phase place.
4. virtual-antenna according to claim 3 shines upon phase adjusting method, it is characterized in that, described basis is corresponding to the second channel quality indication (CQI) information of each described non-MIMO terminal to report of each described VAM phase place and the priority of each described non-MIMO terminal, generate throughput corresponding to each described VAM phase place, comprising:
For each described VAM phase place, priority according to described non-MIMO terminal, when current VAM phase deviation angle is described VAM phase place, the second channel quality indication (CQI) information of each described non-MIMO terminal to report is divided into a plurality of priority groups, and the weight of definite each described priority groups, calculate the mean value of the second channel quality indication (CQI) information of each described priority groups, generate described throughput according to the mean value of each described priority groups and the weight of each described priority groups.
5. virtual-antenna according to claim 3 shines upon phase adjusting method, it is characterized in that the described priority of obtaining each described non-MIMO terminal comprises:
Obtain the quality of service information of each described non-MIMO terminal, determine the priority of each described non-MIMO terminal according to the quality of service information of each described non-MIMO terminal.
6. a base station is characterized in that, comprising:
The quantity determination module is for the quantity of determining multiple-input and multiple-output MIMO terminal;
The first processing module, surpass predetermined threshold value if be used for described quantity, then in a plurality of virtual-antenna mapping VAM phase places, according to corresponding at least two the first channel quality indication (CQI) informations of each described MIMO terminal to report of each described VAM phase place and the second channel quality indication (CQI) information of at least one non-MIMO terminal to report, generate throughput corresponding to each described VAM phase place;
Adjusting module for VAM phase place corresponding to maximum of determining described throughput, is adjusted to definite VAM phase place with current VAM phase deviation angle.
7. base station according to claim 6 is characterized in that:
Described the first processing module also is used for for each described VAM phase place, calculate current VAM phase deviation angle when being described VAM phase place, the second average of the first average of at least two the first channel quality indication (CQI) informations of each described MIMO terminal to report and the second channel quality indication (CQI) information of each described non-MIMO terminal to report is according to described the first average and the described throughput of described the second average generation.
8. base station according to claim 6 is characterized in that, also comprises:
The second processing module, be no more than predetermined threshold value if be used for described quantity, then obtain the priority of each described non-MIMO terminal, according to corresponding to the second channel quality indication (CQI) information of each described non-MIMO terminal to report of each described VAM phase place and the priority of each described non-MIMO terminal, generate throughput corresponding to each described VAM phase place.
9. base station according to claim 8 is characterized in that:
Described the second processing module also is used for for each described VAM phase place, priority according to described non-MIMO terminal, when current VAM phase deviation angle is described VAM phase place, the second channel quality indication (CQI) information of each described non-MIMO terminal to report is divided into a plurality of priority groups, and the weight of definite each described priority groups, calculate the mean value of the second channel quality indication (CQI) information of each described priority groups, generate described throughput according to the mean value of each described priority groups and the weight of each described priority groups.
10. base station according to claim 8 is characterized in that:
Described the second processing module also is used for obtaining the quality of service information of each described non-MIMO terminal, determines the priority of each described non-MIMO terminal according to the quality of service information of each described non-MIMO terminal.
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