CN102035580B - Method for retreating rank in spatial multiplexing mode, base station and communication system - Google Patents

Method for retreating rank in spatial multiplexing mode, base station and communication system Download PDF

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CN102035580B
CN102035580B CN 200910196894 CN200910196894A CN102035580B CN 102035580 B CN102035580 B CN 102035580B CN 200910196894 CN200910196894 CN 200910196894 CN 200910196894 A CN200910196894 A CN 200910196894A CN 102035580 B CN102035580 B CN 102035580B
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base station
feedback information
order
channel quality
code word
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CN102035580A (en
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钱颖
张超
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Shanghai Huawei Technologies Co Ltd
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Shanghai Huawei Technologies Co Ltd
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Priority to PCT/CN2010/077438 priority patent/WO2011038677A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0697—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using spatial multiplexing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/063—Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a method for retreating rank in a spatial multiplexing mode, comprising the following steps: receiving feedback information sent by a terminal, wherein the feedback information at least comprises channel quality information and rank indication; and when the rank indicator in the feedback information is larger than 1, according to the channel quality information and preset information, judging whether a downlink channel goes through deep fading with small scale, and if so, using the value of the rank indicator in the feedback information as the current rank indication of a base station. The embodiment of the invention also provides a base station and a communication system correspondingly. The technical scheme of the invention is as follows: according to the received feedback information, judging whether the downlink channel goes through deep fading with small scale, and if so, executing rank retreating operation, thus reducing the number of the transmission layer and reducing the transmission error rate. Therefore, the communication quality is guaranteed so as to provide better experience for a user.

Description

Move back method, base station and the communication system of order in a kind of space multiplexing mode
Technical field
The present invention relates to communication technical field, be specifically related to move back in a kind of space multiplexing mode method, base station and the communication system of order.
Background technology
The spatial reuse transmission technology is split as multilayer with a data flow, transmit at each layer of space, improve reliability and the transmission rate of communication system greatly, be defined as the transmission technology of next generation network by Long Term Evolution (LTE, Long Time Evolution) system.For the adapted space multiplexer mode, specified the user under this pattern, to need feedack to comprise in the LTE agreement: channel quality information (CQI, Channel QualityInformation), pre-coding matrix (PMI, Precoding Matrix Indicator) and order indication (RI, Rank Indicator).Wherein, CQI can represent downlink channel quality information, and suitable Modulation and Coding Scheme (MCS, Modulation and Coding Scheme) is selected according to the CQI of reporting of user in the base station; After the base station received the RI of reporting of user, the multiplex data flow amount of supporting owing to the user equated with RI, can be informed under the present space multiplexer mode multiplex data flow amount that the user supports.Need to prove that also the base station is according to CQI, RI and the PMI of reporting of user, can determine speed, transmitting power, the order (representing with the RI parameter) of the transmission data of base station, the emission parameters such as form of Adaptive Modulation and Coding (AMC).
After the base station receives the RI of user feedback, can adopt the RI of user feedback to carry out follow-up transmission operation (as carrying out MCS selection, pre-encode operation etc.) still, in the prior art when descending channel quality is undesirable, the base station can not reduce the RI that self transmits, but the RI of employing user feedback, therefore, cause down channel loading error occurring rate height, can not guarantee communication quality.
Summary of the invention
The embodiment of the invention provides method, base station and the communication system of moving back order in a kind of space multiplexing mode.
The embodiment of the invention provides the method for moving back order in a kind of space multiplexing mode, comprising:
The feedback information that receiving terminal sends comprises the indication of channel quality information and order at least in the described feedback information;
When order indication in the described feedback information greater than 1 the time, according to described channel quality information and the information that presets, judge whether down channel has experienced the small scale deep fade, if indicate as the current order in base station with the value less than order indication in the described feedback information.
The embodiment of the invention also provides a kind of base station, comprising: the order unit is moved back in receiving element, first judging unit, second judging unit and execution;
Described receiving element is used for the feedback information that receiving terminal sends, and comprises the indication of channel quality information and order in the described feedback information at least;
Described first judging unit is used for judging that the order of described feedback information indicates whether greater than 1;
Described second judging unit, be used for when the described first judging unit judged result be: the order indication in the described feedback information according to described channel quality information and the information that presets, judges whether down channel has experienced the small scale deep fade greater than 1 the time;
The order unit is moved back in described execution, is used for when the described second judging unit judged result being: when described down channel has experienced the small scale deep fade, indicate as the current order in base station with the value less than order indication in the described feedback information.
The embodiment of the invention also provides a kind of communication system, comprising: terminal and base station;
Described terminal is used for sending feedback information, comprises the indication of channel quality information and order in the described feedback information at least;
Described base station is above-mentioned base station.
The embodiment of the invention adopts according to the feedback information that receives, and judges whether down channel has experienced the small scale deep fade, when judged result when being, carry out and move back order and operate, thereby reduced the transmission number of plies, reduction loading error occurring rate.Thereby the assurance communication quality is for the user provides better experience.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is about the equipment that the adopts spatial reuse operation simplified schematic diagram in physical layer among the embodiment one;
Fig. 2 is the general flow chart that the method for order is provided in a kind of space multiplexing mode of providing of embodiment one;
Fig. 3 is the general flow chart that the method for order is provided in a kind of space multiplexing mode of providing of embodiment two;
Fig. 4 is the logical block figure of a kind of base station of providing of embodiment three;
Fig. 5 is a kind of communication system schematic diagram that embodiment four provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
The embodiment of the invention provides the method for moving back order in a kind of space multiplexing mode, and the embodiment of the invention also provides corresponding base station and communication system.Below be elaborated respectively.
Embodiment one,
Present embodiment provides the method for moving back order in a kind of space multiplexing mode, before present embodiment is explained, it will be appreciated that, in the LTE system, adopt the equipment of space multiplexing technique, in comprising of the operating sequence of physical layer transmission data: modulate mapping to the code word scrambling, to the code word after the scrambling, the code word after the modulation mapping carried out layer mapping, the code word after layer is shone upon carries out precoding, the code word after the precoding is launched by antenna.As shown in Figure 1, be the equipment that the adopts spatial reuse operation simplified schematic diagram in physical layer.
Wherein, for the ease of understanding, also need explanation: when layer representation space is multiplexing, the multiplex data flow amount of supporting at same running time-frequency resource, and the number of plies equals the RI that the base station is finally determined, and maximum numbers of plies that can realize at present are 4 layers; Code word is represented independent data stream, and number of codewords is generally 1 or 2, and each code word can be mapped to one deck or two-layer through layer mapping, and CQI can be used for the channel quality information of expression code word.Be that 2 situation describes with code word in the present embodiment, namely have 2 independent data stream in the base station, compare with the situation of the transmission of adopting 1 data flow, adopt 2 independent data streams can improve message transmission rate.
Need to prove that also descending spatial reuse transmission mode comprises: Open-Loop Spatial Multiplexing (Open-loopSpatial Multiplexing; Perhaps be called big delay cyclic delay diversity, Large Delay Cyclic DelayDiversity), and Closed-Loop Spatial Multiplexing (Closed-loop Spatial Multiplexing).Therefore, receive the feedback information of user terminal transmission when the base station after, (as: store the current Open-Loop Spatial Multiplexing that is in the base station according to the transmission mode information of self storing, perhaps be in the transmission mode information of Closed-Loop Spatial Multiplexing), can judge present space multiplexing transmission pattern is Open-Loop Spatial Multiplexing, or Closed-Loop Spatial Multiplexing.Perhaps according to whether pre-coding matrix (PMI, Precoding Matrix Indicator) is arranged in the feedback information, can judge present space multiplexing transmission pattern is Open-Loop Spatial Multiplexing, or Closed-Loop Spatial Multiplexing; Because only when Closed-Loop Spatial Multiplexing, the user sends in the feedback information of base station just can comprise PMI, and therefore, the base station can know that present space multiplexing transmission pattern is Open-Loop Spatial Multiplexing, or Closed-Loop Spatial Multiplexing.
When the base station according to the information that presets (number of codewords information for example, the descending spatial reuse transmission mode information that downlink data transmission adopts etc.), judging current number of codewords is 2, what downlink data transmission adopted is the Open-Loop Spatial Multiplexing pattern, and RI is greater than 1 in the feedback information that receives, then user terminal can be used for representing the channel quality of each code word at the full range band CQI that synchronization reports; When the base station according to the information that presets, judging current number of codewords is that number of codewords is 2, what downlink data transmission adopted is the Closed-Loop Spatial Multiplexing pattern, and RI is greater than 1 in the feedback information that receives, and then two full range band CQI reporting at synchronization of user terminal represent the channel quality of two code words respectively.
The method of order is provided in a kind of space multiplexing mode that provides in the present embodiment, is that example explains with the Closed-Loop Spatial Multiplexing pattern.
The method of moving back order below in a kind of space multiplexing mode that present embodiment is provided explains, and as shown in Figure 2, this method comprises:
Step 1: the feedback information that the base station receiving terminal sends comprises in this feedback information: channel quality information (CQI) and RI at least;
Step 2: the RI in judging feedback information according to the CQI that receives and the information that presets, judges whether down channel has experienced the small scale deep fade greater than 1 the time, if, execution in step 3, if not, process ends;
Wherein, judge in the step 2 that the concrete determination methods whether down channel experiences the small scale deep fade can comprise: judge whether total spectrum efficiency of all code word correspondences in the base station is lower than the threshold value of small scale deep fade, if, then the base station is judged this down channel and has been experienced the small scale deep fade, need execution in step 3, if not, process ends then.
Step 3: indicate as the current order in base station with the value less than order indication in the described feedback information;
Wherein, also can be understood as less than the operation as the current order indication in base station of the value of order indication in the described feedback information: carry out and move back the order operation, make and move back the RI that obtains after the order than the RI that comprises in the feedback information little (perhaps low).Wherein, the current RI that obtains makes the base station judge the quality of current down link according to this RI.
Need to prove that said in the step 3 to move back order operation be the value that the base station reduces the RI parameter, namely the value of RI parameter is less than the RI value in the feedback information in the base station, and wherein, the value of RI is integer, is generally 1,2,3 or 4.
RI in the feedback information that the UE that receives in the base station sends, the measurement that the down channel quality of this RI UE carries out is obtained, but, because only the RI that sends according to UE can not estimate accurately to the quality of down link, if the RI that the base station adopts UE to send sends downlink data, the accuracy that then may cause UE to receive data reduces.Therefore, base station execution in step 2 and step 3, thus select more rational RI, down channel quality is carried out more rational assessment, thereby can select reasonable plan to send downlink data.Wherein, can be same as the prior art according to the decision operation of the downlink quality of RI.
Wherein, because layer number equals the RI that the base station is finally determined, be that the RI that obtains after the order operation is moved back in the base station, moving back the layer number that has in the base station, order operation back reduces, code word is mapped on the layer, transfers out the base station again, because the mapped number of plies of code word reduces, mapping back layer with layer between interference also can reduce, make the error rate of the data that receive in the receiving terminal (perhaps terminal) be reduced.
For the convenience of explanation, in an optional embodiment, the base station carry out with RI reduce to 1 move back the order operation, RI is reduced to 1 after, be understood that, move back order after RI also can be 2 or 3.
Above-mentioned steps 1 makes the base station realize moving back the order operation, according to the feedback information that receives to the explanation of step 3 simultaneously, judge whether down channel has experienced the small scale deep fade, when judged result when being, carry out and move back the order operation, thereby reduced the transmission number of plies, reduced the loading error occurring rate.Thereby the assurance communication quality is for the user provides better experience.
Optionally, move back the method for order in a kind of space multiplexing mode that provides in the present embodiment, can also comprise:
Step 4: send Downlink Control Information to described terminal, comprise the number when anterior layer in this Downlink Control Information, the number of described layer is identical with the current order indication in described base station.
By execution in step 4, make terminal can learn the number of the layer that all code words are mapped in the base station, thereby can demodulate the signal that receives.RI is value 1 after the order for moving back, and comprises in this Downlink Control Information that then the number of moving back the layer after the order is one; RI is value 2 after the order for moving back, and comprises in this Downlink Control Information that then the number of moving back the layer after the order is two; RI is value 3 after the order for moving back, and comprises in this Downlink Control Information that then the number of moving back the layer after the order is three.
Wherein, also need to prove, judge in the above-mentioned steps 2 that the threshold value that whether the corresponding total spectrum efficiency of all code words is lower than the small scale deep fade in the base station specifically can comprise:
Step S1: according to the information that presets and the feedback information that receives, obtain the spectrum efficiency of the channel quality information correspondence of each code word;
Wherein, said preset information can comprise among the step S1: number of codewords information and descending spatial reuse transmission mode.If the base station is in the Closed-Loop Spatial Multiplexing pattern, and the code word number is 2; Then the base station receive in the feedback information CQI should comprise two parameter value: CQI1 and CQI2, represent the channel quality information parameter of two code words respectively.According to the CQI1 that obtains and CQI2, the base station can find spectrum efficiency eff1, the eff2 corresponding with CQI1, CQI2 difference according to the tabulation of self storing.
Step S2: according to the spectrum efficiency of the channel quality information correspondence of each code word of obtaining, and the RI in the feedback information that receives and the layer mapping relations information that presets, obtain the spectrum efficiency of each code word;
Wherein, the layer mapping relations information that presets among the above-mentioned steps S2 specifically can be during the last downlink transmission data, code word to be mapped to the relation of layer in the base station.For example: to two code words of giving an example in the present embodiment, the number of plies in the base station during the last downlink transmission data is 3 layers situation, the layer mapping relations that preset comprise: first code word is mapped in one deck, second code word is mapped to two-layer in addition, the process of concrete mapping is prior art, repeats no more here.
Step S3: according to the spectrum efficiency of each code word of obtaining, obtain total spectrum efficiency of all code word correspondences;
Wherein, need to prove, the data on the code word generate in the base station (which code word is exactly that the base station defines in other words, therefore, can know mapping relations between 2 code words and the layer in the base station, following formula (1) is depicted as the mapping relations between possible code word and the layer:
l i = l 1 = 1 , l 2 = 1 RI = 2 l 1 = 1 , l 2 = 2 RI = 3 l 1 = 2 , l 2 = 2 RI = 4 - - - ( 1 )
Wherein, i represents the 1st code word and the 2nd code word in two code words, and the value of i is 1 or 2, l iThe number of plies of representing the mapping of i code word, as: RI is 2 o'clock, represent in this space multiplexing mode all code words can be mapped in two-layer in, wherein, normally the 1st code word, the 2nd code word are mapped to respectively in each one deck; When RI was 3, the number of plies that 2 code words can be mapped in this space multiplexing mode was 3 layers, and usually the 1st code word being mapped to one deck (is l 1=1), being mapped to the 2nd code word two-layer (is l 2=2); When RI was 4, the number of plies that 2 code words can be mapped in this space multiplexing mode was 4 layers, normally each code word is shone upon separately two-layer, the layer of each code word mapping with layer between be independently.
The spectrum efficiency corresponding according to the channel quality information of the mapping relations between code word and the layer and each code word of having obtained can be easy to get access to total spectrum efficiency of all code word correspondences, shown in the following formula (2):
eff sum＝eff 1·l 1+eff 2·l 2 (2)
Wherein, eff SumTotal spectrum efficiency of representing all code word correspondences; Eff 1L 1The spectrum efficiency of representing the 1st code word; Eff 2L 2The spectrum efficiency of representing the 2nd code word.
For the situation that 1 code word is mapped to two layers, every layer of number of symbols that goes up carrying is identical in these two layers, then the spectrum efficiency of this code word be every layer of code element that goes up carrying spectrum efficiency and (therefore, the spectrum efficiency of the 1st code word is eff 1L 1, the spectrum efficiency of the 2nd code word is eff 2L 2).
Step S4: the threshold value of the small scale deep fade whether total spectrum efficiency of judging all the code word correspondences obtain presets less than (namely being lower than), if, then trigger to carry out and move back the order operation, namely execution in step 3, if not, process ends then.
Wherein, need to prove that specifically value of setting of the threshold value of said small scale deep fade is relevant with the dissemination channel environment in the step 3, threshold value that can be different according to the dissemination channel environment set.If total spectrum efficiency of all code word correspondences (is used eff less than threshold value THExpression), think that then down channel has experienced the small scale deep fade, the base station is carried out and is moved back the order operation.
More than be in the Closed-Loop Spatial Multiplexing pattern, judge whether the corresponding total spectrum efficiency of all code words in the base station is lower than the concrete operations of the threshold value of small scale deep fade, for the manner of execution in the Open-Loop Spatial Multiplexing pattern, because user terminal only reports a full range band CQI to represent the channel quality information of each code word at synchronization, the base station according to this CQI self the storage tabulation, find corresponding spectrum efficiency eff, namely get access to the spectrum efficiency of the channel quality information correspondence of each code word; Total spectrum efficiency of all code word correspondences then be each code word the channel quality information correspondence spectrum efficiency N doubly, the N here is the number of the layer in the base station, follow-up operation is identical with the operation in the Closed-Loop Spatial Multiplexing pattern, can no longer repeat here with reference to moving back the explanation of order operation in the Closed-Loop Spatial Multiplexing pattern.
Embodiment two,
Present embodiment provides the method for moving back order in a kind of space multiplexing mode, this method is on the basis of the method that embodiment one provides, increased the base station after moving back order, select the operation of Modulation and Coding Scheme (MCS), make that the base station can more rational selection MCS after moving back order, thereby guarantee base station and communication between terminals quality.
As shown in Figure 3, introduced the method for moving back order in a kind of space multiplexing mode that one embodiment of the invention provides.Wherein
Step 301,302 with embodiment illustrated in fig. 2 in step 1,2 identical, specifically can be with reference to the explanation in embodiment illustrated in fig. 2.
Step 303: indicate as the current order in base station with the value less than order indication in the described feedback information.；
Wherein, to reduce RI be 1 in the base station in the step 303, makes the base station in that to move back the layer mapping that order carries out code word simpler, and can guarantee communication quality.
Step 304: according to RI in the CQI in the number of transmit antennas that presets and the feedback information that receives, the feedback information, determine to move back the MCS after the order.
Wherein, before step 304 is explained, need to prove that in the space division multiplexing pattern, RI is normally smaller or equal to number of antennas.
In the above-mentioned steps 304 according to CQI, RI in number of transmit antennas and the feedback information that receives, select MCS, because for a specific base stations, the number of its emission fate is known, then regard to down under the situation that has the transmitting antenna data that preset in the base station (wherein, be relation arranged side by side between the various situations), the example that is operating as with base station selection MCS describes below, specifically comprises:
Situation f1: when the number of transmit antennas that presets is 2, and the RI that receives in the feedback information is 2 o'clock, then according to channel quality information (being CQI1 and the CQI2) channel quality information that intermediate value is bigger of two code words in the feedback information that receives, selecting MCS, is 1 o'clock MCS as current RI with the MCS that selects;
It will be appreciated that also the base station adopts closed loop space division multiplexing pattern to transmit in the present embodiment, therefore, the CQI that the base station receives comprises the channel quality information of two code words, i.e. CQI1 and CQI2.Subsequent operation has identical explanation.For the situation that the base station adopts open loop space division multiplexing pattern to transmit, the CQI that receives owing to the base station represents that with a CQI parameter this CQI parameter can be represented the channel quality information of each code word.Then do not need to choose the bigger channel quality information of channel quality information intermediate value of two code words, because a CQI parameter value that all receives with the base station in the channel quality information of two code words is represented, is identical.So for the situation that open loop space division multiplexing pattern transmits, the operation of selecting MCS after the order is moved back in the base station, a CQI parameter value that can receive according to the base station is selected MCS, is 1 o'clock MCS as current RI with the MCS that selects.
Also it will be appreciated that, because after moving back order, RI in the base station is 1, then in the base station two code words are mapped on unique layer, adopt this mapping to transmit, the value of the CQI parameter of each code word of obtaining at receiving terminal, will beguine according to RI when transmitting greater than 1 o'clock, the value of the CQI parameter of each code word of obtaining is big.That is to say that (when RI is 1) can obtain better communication quality when two code words are mapped to one deck, then can select the more MCS of high coding efficiency.Therefore, in step f1, according to channel quality information (being CQI1 and the CQI2) channel quality information that intermediate value is bigger of two code words in the feedback information that receives, select MCS.Just with CQI Max=max{CQI 1, CQI 2, being approximately RI is 1 o'clock, the channel quality information of the code word that receiving terminal estimates.According to CQI Max, select MCS.
Wherein, according to the value of CQI parameter, selection MCS specifically can be with reference to the form of correspondence, and concrete operations can be with reference to prior art.
Situation f2: when the number of transmit antennas that presets is 4, and the RI that receives in the feedback information is 2 o'clock, then according to channel quality information (being CQI1 and the CQI2) channel quality information that intermediate value is bigger of two code words in the feedback information that receives, selects MCS; Be 1 o'clock MCS as current RI with the MCS that selects;
Wherein, step f2 is similar to step f1, and difference is base station transmit antennas number difference, adopts different number of transmit antennas.It will be appreciated that, the value of RI be with the base station in to carry out the number of plies of layer mapping identical, the number of layer can represent in the space division multiplexing pattern effectively number of antennas, this effective number of transmit antennas is smaller or equal to the actual transmission number of antennas.By formula (1) as can be known, when RI was 2, each code word is individual to be mapped on different one decks.Then when RI is reduced to 1, then according to channel quality information (being CQI1 and the CQI2) channel quality information that intermediate value is bigger of two code words in the feedback information that receives, select MCS.
Situation f3: when the number of transmit antennas that presets was 4, the RI that receives in the feedback information was 3 o'clock, then according to the channel quality information (being CQI1 and CQI2) of two code words in the feedback information that receives, obtained the spectrum efficiency of each code word; Select Modulation and Coding Scheme as the current Modulation and Coding Scheme in base station, wherein, the value of the current corresponding spectrum efficiency of Modulation and Coding Scheme is greater than or equal to the maximum in the spectrum efficiency of described all code words of obtaining;
Wherein, need to prove that if the RI that reports is 3, then first code word is mapped on the layer, second code word is mapped on two layers, and this moment, two code word spectrum efficiencies were respectively eff 1And 2eff 2, get eff Max={ eff 1, 2eff 2, select spectrum efficiency more than or equal to eff then MaxMCS, make that as moving back order RI is 1 o'clock MCS.Wherein, owing in the base station, normally preset the spectrum efficiency tabulation corresponding with MCS, can inquire MCS according to spectrum efficiency, the value of spectrum efficiency specifically can be the numerical value of segmentation, then MCS is each spectrum efficiency numerical value correspondence, if the eff that the base station obtains MaxIn tabulation, do not have identical spectrum efficiency numerical value, then select spectrum efficiency recently and be greater than or equal to eff MaxMCS.Usually, the code efficiency of MCS is more high, and the spectrum efficiency of code word is then more big.Therefore, reduce the number of plies among the step f3, can select the higher MCS of code efficiency.
Situation f4: when the number of transmit antennas that presets was 4, the RI that receives in the feedback information was 4 o'clock, then according to the channel quality information (being CQI1 and CQI2) of two code words in the feedback information that receives, obtained the spectrum efficiency of each code word; Select Modulation and Coding Scheme as the current Modulation and Coding Scheme in base station, wherein, the value of the current corresponding spectrum efficiency of Modulation and Coding Scheme is greater than or equal to the maximum in the spectrum efficiency of all code words of obtaining.
Wherein, need to prove that if the RI that reports is 4, then two code words all are mapped to two-layerly, this moment, the spectrum efficiency of two code words was respectively 2eff 1And 2eff 2, get eff Max={ 2eff 1, 2eff 2, select spectrum efficiency more than or equal to eff then MaxMCS, make that as moving back order RI is 1 o'clock MCS.
To the explanation of step f1 to step f4, make the base station by above-mentioned after moving back the order operation, can select the higher MCS of code efficiency, reduce to carry out and move back the order operation to the influence of the throughput between base station and the terminal.
In the above-mentioned steps 304 detailed explanation a kind ofly select carrying into execution a plan of MCS after moving back order, also provide a kind of moving back to select carrying into execution a plan of MCS after the order in the present embodiment, following steps 305 are described, step 305 can be used as the alternative of step 304, the designer can select step 304, perhaps step 305 according to actual needs.
Step 305: according to the CQI in the feedback information that receives, RI, obtain total spectrum efficiency of all code word correspondences; Select Modulation and Coding Scheme as the current Modulation and Coding Scheme in base station, wherein, the value of the current corresponding spectrum efficiency of Modulation and Coding Scheme is greater than or equal to the value of total spectrum efficiency of all code word correspondences of obtaining.
Wherein, according to CQI, RI in the feedback information that receives, obtain the concrete operations of total spectrum efficiency of all code word correspondences step S1 and the S2 in can reference example one in the step 305.
Said selection spectrum efficiency is greater than or equal to the MCS of total spectral efficiency values of all code word correspondences of obtaining in the step 305, is 1 o'clock MCS as current RI, and concrete operations can comprise:
Store a MCS form in the base station, each MCS is corresponding spectral efficiency values SEi, arranges according to order from big to small: SE0＜=SE1＜=SE2....＜=SE28, find out a MCSi (i represents the index of MCS), and satisfy SEi＜=eff Sum＜SEi+1.
By above-mentioned explanation to present embodiment, this method adopts according to the feedback information that receives, and judges whether down channel has experienced the small scale deep fade, when judged result when being, carry out and move back order and operate, thereby reduced the transmission number of plies, reduction loading error occurring rate.Owing to increased step F 4 or step F 5, make the base station after moving back the order operation, can select the higher MCS of code efficiency, reduce to carry out and move back the order operation to the influence of the throughput between base station and the terminal.
Embodiment three,
Present embodiment provides a kind of base station, and illustrated method among above-described embodiment one or the embodiment two can be carried out in this base station.As shown in Figure 4, this base station comprises: order unit 40 is moved back in receiving element 10, first judging unit 20, second judging unit 30 and execution.Optional this base station can also comprise: transmitting element 50.
Wherein, receiving element 10 is used for the feedback information that receiving terminal sends, and comprises at least in this feedback information: channel quality information (CQI) and RI;
Need to prove, pattern for the closed loop space division multiplexing, and code word is 2 o'clock, channel quality information can be to comprise two parameters in the feedback information that receives in the receiving element 10, these two channel quality parameter that parameter is respectively two code words can be represented this two parameters with CQI1, CQI2.
Whether first judging unit 20 be used for judges the RI of the feedback information that receives greater than 1, if, notify second judging unit 30, if not, do not carry out any operation;
Second judging unit 30, be used for when the described first judging unit judged result be: the order in the described feedback information is indicated greater than 1 the time, according to the CQI that receives and the information that presets, judge whether down channel has experienced the small scale deep fade, if, notice is carried out and is moved back order unit 40, if not, does not carry out any operation.
Wherein, judge in second judging unit 30 whether down channel has experienced the small scale deep fade, specifically can be judge all code word correspondences total spectrum efficiency whether less than the threshold value of small scale deep fade, if, then down channel has experienced the small scale deep fade, and then notice is carried out and moved back order unit 40.Wherein, second judging unit 30 also can have other concrete determination methods, herein than the restriction that is construed as present embodiment.
Order unit 40 is moved back in execution, is used for when the described second judging unit judged result being: when described down channel has experienced the small scale deep fade, indicate as the current order in base station with the value less than order indication in the described feedback information.
Explanation by the above-mentioned base station that present embodiment is provided, the feedback information that this base station receives according to receiving element 10, when first judging unit 20 is judged RI greater than 1 the time, judge by second judging unit 30 whether down channel has experienced the small scale deep fade, when judged result when being, the order operation is moved back in execution, thereby has reduced the transmission number of plies, reduces the loading error occurring rate.Thereby the assurance communication quality is for the user provides better experience.
Optionally, this base station can also comprise: transmitting element 50, be used for sending Downlink Control Information to described terminal, and comprise the number when anterior layer in the described Downlink Control Information, the number of described layer is identical with the current order indication in described base station.
By increasing transmitting element 50, make terminal can learn the number of plies that all code words are mapped in the base station, thereby can decode the signal that receives easilier.
Optionally, second judging unit 30 specifically can comprise: first acquiring unit 301, second acquisition unit 302, the 3rd acquiring unit 303 and the 3rd judging unit 304.
Wherein, first acquiring unit 301 is used for obtaining the spectrum efficiency of the channel quality information correspondence of each code word according to the information that presets and the feedback information that receives;
Need to prove that the information that presets can comprise: the base station is in the Closed-Loop Spatial Multiplexing pattern, and the code word number is 2.Then judge the channel information that channel quality information in the feedback information comprises two code words easily, be respectively CQI1, CQI2, then be easy to get access to spectrum efficiency eff1, the eff2 of CQI1, CQI2 correspondence, this is prior art, does not describe in detail.
Second acquisition unit 302, the spectrum efficiency that is used for the channel quality information correspondence of each code word of obtaining according to first acquiring unit 301, three of RI in the feedback information that receives and the layer mapping relations information in the preset information are obtained the spectrum efficiency of each code word;
The 3rd acquiring unit 303 is used for the spectrum efficiency according to each code word of obtaining, obtains total spectrum efficiency of all code word correspondences.
Wherein, get access to the process of total spectrum efficiency of all code word correspondences in the 3rd acquiring unit 303 in detail, the explanation in can reference method embodiment one, two, and obtain easily.
The threshold value of the small scale deep fade whether the 3rd judging unit 304, the total spectrum efficiency that is used for judging all code word correspondences that second acquisition unit 302 obtains preset less than (perhaps being lower than) is if order unit 40 is moved back in the notice execution.
Need to prove that also this base station can also realize moving back after the order operation again, according to current RI, selects more rational modulating-coding (MCS) scheme.Therefore, this base station can also comprise: select Modulation and Coding Scheme unit 60.
Wherein, select Modulation and Coding Scheme unit 60, be used for when carry out move back order unit 40 carry out move back order after, make that RI is at 1 o'clock, according to the CQI in the feedback information that receives, RI, selection Modulation and Coding Scheme (MCS).
Need to prove, select to carry out in the MCS unit 60 and select the concrete operations of MCS can have multiple.Therefore, select MCS unit 60 can have multiple structure.Be described in detail as follows:
Select MCS unit 60 specifically to comprise: first selects MCS unit 601.
The first selection MCS unit 602 is used for according to CQI, the RI in feedback information of the number of transmit antennas that presets with the feedback information that receives, and selects the MCS after order is moved back in the MCS conduct.
Need to prove that first selects can specifically comprise in the MCS unit 602:
When the number of transmit antennas that presets is 2, the RI that receives in the feedback information is 2 o'clock, then according to channel quality information (being CQI1 and the CQI2) channel quality information that intermediate value is bigger of two code words in the feedback information that receives, selecting MCS, is 1 o'clock MCS as current RI with the MCS that selects;
Perhaps, when the number of transmit antennas that presets is 4, the RI that receives in the feedback information is 2 o'clock, then according to channel quality information (being CQI1 and the CQI2) channel quality information that intermediate value is bigger of two code words in the feedback information that receives, selecting MCS, is 1 o'clock MCS as current RI with the MCS that selects.
Select comprising that first selects can also comprise: first acquiring unit 301, second acquisition unit 302 on the basis of MCS unit 601 in the MCS unit 60.
Wherein, first acquiring unit 301, second acquisition unit 302 can independently be present in and select in the MCS unit 60, also can be independently to be present in second judging unit 30; Also can be to select MCS unit 60 and second judging unit 30 to share two acquiring units.
If select comprising that first selects can also comprise: first acquiring unit 301, second acquisition unit 302 on the basis of MCS unit 601 in the MCS unit 60; Then first select MCS unit 601 also to be used for:
When the number of transmit antennas that presets was 4, the RI that receives in the feedback information was 3 o'clock, then according to the channel quality information (being CQI1 and CQI2) of two code words in the feedback information that receives, obtained the spectrum efficiency of each code word; Select Modulation and Coding Scheme as the current Modulation and Coding Scheme in base station, wherein, the value of the described current corresponding spectrum efficiency of Modulation and Coding Scheme is greater than or equal to the maximum in the spectrum efficiency of described all code words of obtaining; Also can be understood as the MCS that selects spectrum efficiency to be greater than or equal to the spectral efficiency values of the bigger code word of obtaining, is 1 o'clock MCS as current RI with the MCS that selects;
Perhaps, when the number of transmit antennas that presets was 4, the RI that receives in the feedback information was 4 o'clock, then according to the channel quality information (being CQI1 and CQI2) of two code words in the feedback information that receives, obtained the spectrum efficiency of each code word; Select Modulation and Coding Scheme as the current Modulation and Coding Scheme in base station, wherein, the value of the described current corresponding spectrum efficiency of Modulation and Coding Scheme is greater than or equal to the maximum in the spectrum efficiency of described all code words of obtaining; Also can be understood as the MCS that selects spectrum efficiency to be greater than or equal to the spectral efficiency values of the bigger code word of obtaining, is 1 o'clock MCS as current RI with the MCS that selects;
Optionally, as shown in phantom in Figure 4, select MCS unit 60 also can specifically comprise: second selects MCS unit 602, for total spectrum efficiency of getting all code word correspondences of obtaining according to the 3rd acquiring unit 303, select Modulation and Coding Scheme as the current Modulation and Coding Scheme in base station, wherein, the value of the described current corresponding spectrum efficiency of Modulation and Coding Scheme is greater than or equal to the value of total spectrum efficiency of described all code word correspondences of obtaining.The Modulation and Coding Scheme that also can be understood as selection is: the spectrum efficiency of described Modulation and Coding Scheme correspondence is greater than or equal to total spectrum efficiency of described all code word correspondences, is 1 o'clock MCS as current RI.
It will be appreciated that the explanation of the above-mentioned base station that present embodiment is provided, the explanation in also can reference method embodiment one, two.
By the explanation to above-mentioned base station, this base station judges according to the feedback information that receives whether down channel has experienced the small scale deep fade, when judged result when being, carry out and move back order and operate, thereby reduced the transmission number of plies, reduction loading error occurring rate.Owing to select MCS unit 60, make the base station after moving back the order operation, can select the higher MCS of code efficiency, reduce to carry out and move back the order operation to the influence of the throughput between base station and the terminal.
Embodiment four,
Present embodiment provides a kind of communication system, as shown in Figure 5, comprising: terminal 100 and base station 200.
Wherein, terminal 100 is used for transmission and feeds back to base station 200, comprises at least in this feedback information: channel quality information (CQI) and RI;
Base station 200 is used for the feedback information that receiving terminal sends, and comprises at least in this feedback information: channel quality information (CQI) and RI; Whether judge RI in the feedback information receive greater than 1, if, according to the CQI that receives and the information that presets, judge whether down channel has experienced the small scale deep fade, if, carry out and to move back the order operation, make that the RI that moves back after the order is littler than the RI that comprises in the feedback information.
Explanation by the above-mentioned communication system that present embodiment is provided, the feedback information that base station 200 sends according to the terminal 100 that receives in this communication system, when judging RI greater than 1 the time, judge whether down channel has experienced the small scale deep fade, when judged result when being, the order operation is moved back in execution, thereby has reduced the transmission number of plies, reduces the loading error occurring rate.Thereby the assurance communication quality is for the user provides better experience.
Optionally, this base station 200 also be used for to send Downlink Control Information to terminal, comprises the number of plies of moving back after the order in this Downlink Control Information, and the number of plies is identical with RI.
Optionally, this base station 200, also be used for when carry out move back order unit 40 carry out move back order after, make that RI is at 1 o'clock, according to the CQI in the feedback information that receives, RI, selection Modulation and Coding Scheme (MCS).
Wherein, the base station 200 in a kind of communication system that present embodiment provides can be the base station that provides among the embodiment three, and the explanation of detailed description in can reference example three do not repeat herein.
One of ordinary skill in the art will appreciate that all or part of step in the whole bag of tricks of above-described embodiment is to instruct relevant hardware to finish by program, this program can be stored in the computer-readable recording medium, and storage medium can comprise: ROM, RAM, disk or CD etc.
More than move back order in a kind of space multiplexing mode that the embodiment of the invention is provided method, base station and communication system be described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims (13)

1. move back the method for order in the space multiplexing mode, it is characterized in that, comprising:
The feedback information that receiving terminal sends comprises the indication of channel quality information and order at least in the described feedback information;
When order indication in the described feedback information greater than 1 the time, according to described channel quality information and the information that presets, judge whether down channel has experienced the small scale deep fade, if indicate as the current order in base station with the value less than order indication in the described feedback information.
2. move back the method for order in a kind of space multiplexing mode according to claim 1, it is characterized in that, described according to described channel quality information and the information that presets, judge that whether down channel has experienced the small scale deep fade, specifically comprises:
According to the channel quality information in the described information that presets and the described feedback information, obtain the spectrum efficiency of the channel quality information correspondence of each code word;
According to the spectrum efficiency of the channel quality information correspondence of described each code word that gets access to, the order indication in the described feedback information and the layer mapping relations in the described information that presets are obtained the spectrum efficiency of each code word;
According to the spectrum efficiency of described each code word of obtaining, obtain total spectrum efficiency of all code word correspondences;
Whether total spectrum efficiency of judging described all code word correspondences is less than the threshold value of the small scale deep fade that presets, if then judge down channel and experienced the small scale deep fade.
3. move back the method for order in a kind of space multiplexing mode according to claim 1, it is characterized in that, described with after indicating as the current order in base station less than the value of order indication in the described feedback information, described method also comprises:
If current order is designated as 1, according to the channel quality information in the number of transmit antennas that presets and the described feedback information and the indication of the order in the described feedback information, select Modulation and Coding Scheme.
4. move back the method for order in a kind of space multiplexing mode according to claim 3, it is characterized in that, Modulation and Coding Scheme is selected in channel quality information in the number of transmit antennas that described basis presets and the described feedback information and the indication of the order in the described feedback information, specifically comprises:
When the number of transmit antennas that presets is 2, and the order in the described feedback information is designated as at 2 o'clock, and then bigger parameter value in the channel quality information according to code word selects Modulation and Coding Scheme as the current Modulation and Coding Scheme in base station; Channel quality information in the described feedback information comprises: the channel quality information parameter value of first code word and the channel quality information parameter value of second code word;
Perhaps, when the number of transmit antennas that presets is 4, and the order in the described feedback information is designated as at 2 o'clock, and then bigger parameter value in the channel quality information according to code word selects Modulation and Coding Scheme as the current Modulation and Coding Scheme in base station; Channel quality information in the described feedback information comprises: the channel quality information parameter value of first code word and the channel quality information parameter value of second code word;
Perhaps, when the number of transmit antennas that presets is 4, and the order in the described feedback information is designated as at 3 o'clock, then according to the channel quality information in the described feedback information, obtains the spectrum efficiency of each code word; Select Modulation and Coding Scheme as the current Modulation and Coding Scheme in base station, wherein, the value of the described current corresponding spectrum efficiency of Modulation and Coding Scheme is greater than or equal to the maximum in the spectrum efficiency of described all code words of obtaining;
Perhaps, when the number of transmit antennas that presets is 4, and the order in the described feedback information is designated as at 4 o'clock, then according to the channel quality information in the described feedback information, obtains the spectrum efficiency of each code word; Select Modulation and Coding Scheme as the current Modulation and Coding Scheme in base station, wherein, the value of the described current corresponding spectrum efficiency of Modulation and Coding Scheme is greater than or equal to the maximum in the spectrum efficiency of described all code words of obtaining.
5. move back the method for order in a kind of space multiplexing mode according to claim 1, it is characterized in that, described with after indicating as the current order in base station less than the value of order indication in the described feedback information, described method also comprises:
If current order is designated as 1, indicate according to the order in the channel quality information in the described feedback information, the described feedback information, obtain total spectrum efficiency of all code word correspondences, select Modulation and Coding Scheme as the current Modulation and Coding Scheme in base station, wherein, the value of the described current corresponding spectrum efficiency of Modulation and Coding Scheme is greater than or equal to the value of total spectrum efficiency of described all code word correspondences of obtaining.
6. move back the method for order in a kind of space multiplexing mode according to claim 1, it is characterized in that, described with after indicating as the current order in base station less than the value of order indication in the described feedback information, described method also comprises:
Send Downlink Control Information to described terminal, comprise the number when anterior layer in the described Downlink Control Information, the number of described layer is identical with the current order indication in described base station.
7. a base station is characterized in that, comprising: the order unit is moved back in receiving element, first judging unit, second judging unit and execution;
Described receiving element is used for the feedback information that receiving terminal sends, and comprises the indication of channel quality information and order in the described feedback information at least;
Described first judging unit is used for judging that the order of described feedback information indicates whether greater than 1;
Described second judging unit, be used for when the described first judging unit judged result be: the order indication in the described feedback information according to described channel quality information and the information that presets, judges whether down channel has experienced the small scale deep fade greater than 1 the time;
The order unit is moved back in described execution, is used for when the described second judging unit judged result being: when described down channel has experienced the small scale deep fade, indicate as the current order in base station with the value less than order indication in the described feedback information.
8. base station according to claim 7 is characterized in that, described second judging unit specifically comprises:
First acquiring unit is used for the channel quality information according to the described information that presets and described feedback information, obtains the spectrum efficiency of the channel quality information correspondence of each code word;
Second acquisition unit is used for the spectrum efficiency according to the channel quality information correspondence of described each code word that gets access to, and three of the order indication in the described feedback information and the layer mapping relations in the described information that presets are obtained the spectrum efficiency of each code word;
The 3rd acquiring unit is used for the spectrum efficiency according to described each code word of obtaining, obtains total spectrum efficiency of all code word correspondences;
Whether the 3rd judging unit, the total spectrum efficiency that is used for judging described all code word correspondences be less than the threshold value of the small scale deep fade that presets, if then judge down channel and experienced the small scale deep fade.
9. according to claim 7 or 8 described base stations, it is characterized in that, described base station also comprises: first selects the coded modulation unit, be used for if current order is designated as 1, according to the channel quality information in the number of transmit antennas that presets and the described feedback information, order indication in the described feedback information, select Modulation and Coding Scheme.
10. base station according to claim 9 is characterized in that, described first selects the coded modulation unit specifically to be used for:
When the number of transmit antennas that presets is 2, and the order in the described feedback information is designated as at 2 o'clock, and then bigger parameter value in the channel quality information according to code word selects Modulation and Coding Scheme as the current Modulation and Coding Scheme in base station; Channel quality information in the described feedback information comprises: the channel quality information parameter value of first code word and the channel quality information parameter value of second code word;
Perhaps, when the number of transmit antennas that presets is 4, and the order in the described feedback information is designated as at 2 o'clock, and then bigger parameter value in the channel quality information according to code word selects Modulation and Coding Scheme as the current Modulation and Coding Scheme in base station; Channel quality information in the described feedback information comprises: the channel quality information parameter value of first code word and the channel quality information parameter value of second code word;
Perhaps, when the number of transmit antennas that presets is 4, and the order in the described feedback information is designated as at 3 o'clock, then according to the channel quality information in the described feedback information, obtains the spectrum efficiency of each code word; Select Modulation and Coding Scheme as the current Modulation and Coding Scheme in base station, wherein, the value of the described current corresponding spectrum efficiency of Modulation and Coding Scheme is greater than or equal to the maximum in the spectrum efficiency of described all code words of obtaining;
Perhaps, when the number of transmit antennas that presets is 4, and the order in the described feedback information is designated as at 4 o'clock, then according to the channel quality information in the described feedback information, obtains the spectrum efficiency of each code word; Select Modulation and Coding Scheme as the current Modulation and Coding Scheme in base station, wherein, the value of the described current corresponding spectrum efficiency of Modulation and Coding Scheme is greater than or equal to the maximum in the spectrum efficiency of described all code words of obtaining.
11. base station according to claim 8, it is characterized in that, described base station also comprises: second selects the coded modulation unit, be used for if current order is designated as 1, according to total spectrum efficiency of obtaining all code word correspondences in described the 3rd acquiring unit, select Modulation and Coding Scheme as the current Modulation and Coding Scheme in base station, wherein, the value of the described current corresponding spectrum efficiency of Modulation and Coding Scheme is greater than or equal to the value of total spectrum efficiency of described all code word correspondences of obtaining.
12. base station according to claim 7 is characterized in that, described base station also comprises:
Transmitting element is used for sending Downlink Control Information to described terminal, comprises the number when anterior layer in the described Downlink Control Information, and the number of described layer is identical with the current order indication in described base station.
13. a communication system is characterized in that, comprising: terminal and base station;
Described terminal is used for sending feedback information, comprises the indication of channel quality information and order in the described feedback information at least;
Described base station is for as each described base station of claim 8-12.
CN 200910196894 2009-09-29 2009-09-29 Method for retreating rank in spatial multiplexing mode, base station and communication system Expired - Fee Related CN102035580B (en)

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