CN101827389A - Method for acquiring complete channel quality information of downlink frequency domain - Google Patents
Method for acquiring complete channel quality information of downlink frequency domain Download PDFInfo
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- CN101827389A CN101827389A CN201010127786A CN201010127786A CN101827389A CN 101827389 A CN101827389 A CN 101827389A CN 201010127786 A CN201010127786 A CN 201010127786A CN 201010127786 A CN201010127786 A CN 201010127786A CN 101827389 A CN101827389 A CN 101827389A
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Abstract
The invention provides a method for acquiring complete channel quality information of a downlink frequency domain, which comprises the steps of: in interval in-turn sub-band CQI feedback, after a base station receives sub-band reports fed back by UE every time, in the current sub-band pointed by the sub-band report, setting an MCS index value of each RB corresponding to the current sub-band as an MCS index value carried in the sub-band report; and estimating MCS index values of the RBs between the sub-band pointed by the last sub-band report and the current sub-band in a curve-fitting mode according to the MCS index value carried in the sub-band report fed back by the UE and the MCS index value carried in the sub-band report in the last CQI feedback period. By applying the method, the accuracy of curve-fitting results of channel quality can be improved.
Description
Technical field
The channel quality information that the present invention relates in the communication system reports and obtains technology, particularly a kind of method of obtaining complete channel quality information of downlink frequency domain.
Background technology
In downlink transfer mechanism based on the LTE system of OFDMA, the subchannel of One's name is legion is in the full mode of sharing, between intrasystem all UE, use by dynamic assignment, according to the channel quality information (CQI) of UE feedback, system can improve the data throughput capacity effectively by frequency domain selectivity scheduling (FFS).
Yet, the feedback of CQI has signaling consumption, system is in order to pare down expenses, do not adopt the complete feedback system of the channel quality on the frequency domain, promptly UE measures and reports CQI information on each channel measurement unit, has stipulated 4 kinds of local channel quality feedback mechanism in LTE, a kind of is only to report a broadband CQI, promptly measure on the whole frequency domain of system and feed back CQI report, it is mainly used in non-frequency selective scheduling, as voice service; It is that unit carries out with subband (Subband) all that the CQI of other three kinds of feedback mechanisms measures, these all are used to support the feedback mechanism of frequency selective scheduling, and they are respectively: " Best M " subband CQI feedback, interval be CQI subband feedback and complete subband CQI feedback in turn.
The interval is subband CQI feedback mechanism in turn, is applied to periodic CQI report, mainly is carried on the PUCCH channel.This mechanism is divided into several frequency bands earlier with system's frequency domain, and (Bandwidth Part BP), comprises several subbands inside each BP, and each subband comprises several Resource Block (RB).In each CQI report, UE carries out channel measurement respectively at the several subbands among the BP, select the subband of one of them channel quality optimum, report its CQI quantized result and the numbering of the subband in BP thereof, and when the cycle that next time reports arrives, select the CQI of the optimal sub-band among the adjacent another one BP of feedback to report successively, carry out the reporting of scan-type of UE band domain channel quality in this mode of taking turns successively.In the protocol specification of this feedback mechanism, frequency band number N
PWith subband size k and band system band width N
RB DLBecome fixing corresponding relation.
In above-mentioned CQI feedback, all that the UE channel quality is the good frequency domain position of each CQI report reports to the base station, so that realize FSS.But, the base station provides service for the UE of intrasystem One's name is legion, can not each UE be desirable frequency domain position transmitting data all In the view of it, if the base station will be placed on UE on other frequency domain position, and the CQI on these frequency domain positions often UE not directly newspaper come up (newspaper come up all be that it it seems the Resource Block that channel quality is good), this just needs the base station to obtain indirectly by certain method.
Method commonly used is to carry out CQI curve fit on the full frequency-domain according to the crest value that UE reports up, as shown in Figure 1, the bar of shade is represented the size and the position of subband on frequency domain of subband CQI report, after receiving a subband CQI report that newly reports, carry out the curve fit of left and right sides twocouese on the frequency domain, curve smoothing is carried out in subband report according to this subband two nearby frequency bands about on the frequency domain, obtains the channel quality information of other subbands in the frequency band of current sub CQI report indication subband place.
Particularly, when carrying out the channel quality curve fit,, estimate the channel quality of other subbands of the subband left side of current sub report indication by curve fit on the one hand according to the subband CQI report of current sub CQI report and its left side nearby frequency bands; According to the subband report of current sub CQI report and its right nearby frequency bands, estimate the channel quality of other subbands of subband the right of current sub report indication by curve fit on the other hand.
Yet the newness degree of the current subband CQI report that reports subband the right and left nearby frequency bands is different, the report on the left side and this report CQI feedback cycle of only being separated by, and the report on the right and this are reported a plurality of CQI feedback cycles of being separated by.Because the CQI of estimated channel quality information time institute foundation report is ageing relatively poor, causes the estimated result of channel quality information inaccurate.
Summary of the invention
The invention provides a kind of method of obtaining complete channel quality information of downlink frequency domain, can when the complete channel quality information of full frequency-domain is provided, improve the estimated result accuracy of channel quality information.
For achieving the above object, the present invention adopts following technical scheme:
A kind of method of obtaining complete channel quality information of downlink frequency domain comprises:
In subband CQI feeds back in turn at interval, the base station is after the subband of the each UE of reception feedback is reported, carry out following operation: in the current sub of this subband report indication, the MCS index value of pairing each RB of this current subband is set to the MCS index value that carries in this subband report;
The MCS index value that carries in MCS index value that carries in the subband report according to UE feedback in the last CQI feedback cycle and the report of this subband is estimated the MCS index value of all RB between the subband of subband report last time indication and the described current sub by the curve fit mode.
Preferably, during the MCS index value of all RB, this method further comprises between the subband of estimating subband report last time indication and described current sub:
For the subband of subband numbering in the frequency band at current sub place less than described current sub, whether the MCS index value that estimates of judging each RB in the respective sub-bands is greater than the MCS index value that carries in this subband report, if then the MCS index value with corresponding RB is updated to the MCS index value that carries in this subband report.
Preferably, describedly be estimated as by the curve fit mode: the fitting a straight line by point-to-point transmission carries out described estimation.
As seen from the above technical solution, among the present invention, the base station each receive the subband report of UE feedback after, in the current sub of this subband report indication, the MCS index value of pairing each RB of this current subband is set to the MCS index value that carries in this subband report; When carrying out the estimation of channel quality information, according to the MCS index value that carries in MCS index value that carries in subband report last time and the report of this subband, estimate the MCS index value of all RB between the subband of subband report last time indication and the current sub by the curve fit mode.Like this, only carry out unidirectional match, utilize the ageing report of CQI preferably to estimate the channel quality information of other subbands, thereby improve the accuracy of channel quality information.
Further, when carrying out curve fitting, can carry out curve fit with good conditionsi, for the subband of subband numbering in the frequency band at current sub place less than described current sub, whether the MCS index value that estimates of judging each RB in the respective sub-bands is greater than the MCS index value that carries in this subband report, if then the MCS index value with corresponding RB is updated to the MCS index value that carries in this subband report.Like this, can further improve the accuracy of channel quality information estimated result.
Description of drawings
Fig. 1 is a CQI curve fit schematic diagram on the full frequency-domain.
Embodiment
For making purpose of the present invention, technological means and advantage clearer, the present invention is described in further details below in conjunction with accompanying drawing.
Basic thought of the present invention is: in CQI feeds back in turn at interval, when estimating the channel quality information of other subbands by curve fit, only carry out unidirectional channel match, promptly only carry out reporting among Fig. 1 the subband left side level and smooth on frequency domain, no longer carry out the level and smooth of the right, thereby institute's ageing according to channel quality information when improving the channel match, the accuracy of raising channel quality information fitting result.
Next, by specific embodiment specific implementation of the present invention is described.
Obtain in the embodiment of the invention in the idiographic flow of complete channel quality information of downlink frequency domain method, the channel match of other relevant subbands is carried out as follows in the base station after the subband of the each UE of reception feedback is reported, specifically comprise:
Step 201, in the current sub of this subband report indication, the MCS index value of pairing each RB of this current subband is set to the MCS index value that carries in this subband report.
As previously mentioned, each subband comprises several RB, and after the subband report that receives the UE feedback, at first this subband is reported the index value that the MCS index of interior all each RB of current sub of indication is set to report.Among the present invention, with the subband of the preferred channels quality that reports in the report of this subband as current sub.
Step 202, the MCS index value that carries in MCS index value that carries in the subband report according to UE feedback in the last CQI feedback cycle and the report of this subband is estimated the MCS index value of all RB between the subband of subband report last time indication and the current sub by the curve fit mode.
When carrying out the channel match in this step, only carry out the MCS index value estimation of other RB between this twice subband report according to subband report last time and the report of this subband, and the subband report that no longer utilizes this subband report and the right nearby frequency bands thereof reports the MCS index value of other subbands of subband the right to estimate, carry out after receiving the subband report and the estimation of this MCS index value is placed on next time, thereby guarantee each other subbands MCS index value estimation of carrying out after the subband report that receives, all be to carry out according to this CQI information with subband report last time, improve the ageing of this CQI information, thereby improve the accuracy of MCS index value estimated result.
Wherein, the mode of concrete curve fit can adopt any existing curve fit mode, does not influence enforcement of the present invention.For example, can simply adopt the fitting a straight line of point-to-point transmission.Simultaneously, when carrying out above-mentioned channel match, be that granularity is carried out with RB, improve the accuracy of match.
Further, as previously mentioned, in CQI fed back in turn at interval, feedback was the CQI information of the subband of channel quality optimum in the frequency band at every turn; And when other subbands CQI information is estimated between these two reports in the report of the subband that reports according to two, can report that other subbands MCS index value of place frequency band is higher than the subband MCS index value that reports by getable this subband, and this estimated result obviously is irrational, for overcoming this problem, the present invention preferably further carries out following processing after estimating to obtain the MCS index value of corresponding RB:
Step 203, for the subband of subband numbering in the frequency band at current sub place less than current sub, whether the MCS index value that estimates of judging each RB in the respective sub-bands is greater than the MCS index value that carries in this subband report, if then the MCS index value with corresponding RB is updated to the MCS index value that carries in this subband report.
Carry out channel match with good conditionsi by step 203, by this mode, make the MCS index value of other subbands of reporting the subband left side in the frequency band of current sub place scarcely greater than the MCS index value that reports subband, thereby further improve the fitting result accuracy of CQI information.
Next provide an object lesson that utilizes the inventive method of program language description, adopt the fitting a straight line mode of point-to-point transmission when wherein carrying out curve fitting.
K; The RB sum of band system band; // this value is a system parameters
L: the partial-band sum in the band system band; // this value is a system parameters
M: the number of sub-bands that comprises in partial-band; // this value is a system parameters
N: the RB quantity that comprises in subband; // this value is a system parameters
K=L*M*N (not necessarily setting up in the actual LTE system);
K: the numbering of a RB on band system band, 0=＜k＜K;
C (k): the MCS index of k RB on the frequency domain that match is come out;
X: feedback cycle constantly;
The numbering of partial-band on frequency domain at a (x): UE specified subband place in current feedback cycle x subband CQI constantly, 0=＜a (x)＜L, and in a full frequency-domain scanning process, satisfy a (x)-a (x-1)=1;
B (x): UE specified subband subband in partial-band in current feedback cycle x subband CQI is constantly numbered 0=＜b (x)＜M;
UE specified subband subband on frequency domain in current feedback cycle x subband CQI constantly is numbered (a (x) * M+b (x));
C (x): UE is specified MCS index value in current feedback cycle x subband CQI constantly;
I, j: temporary variable;
I=(a (x) * M+b (x))-(a (x-1) * M+b (x-1)); Intersubband distance among // twice CQI of being separated by
If(i＞1)
{
for(j＝0；(j＜N*i)；j++)
{
C((a(x-1)*M+b(x-1))*N+j)＝c(x-1)+(c(x)-c(x-1))*j/N/i；
If( (((a(x-1)*M+b(x-1))*N+j)＞＝a(x)*M*N)
&&(C((a(x-1)*M+b(x-1))*N+j)＞c(x)))
{
C((a(x-1)*M+b(x-1))*N+j)＝c(x)；
}
}
}
Specified subband in the else//twice CQI report when adjacent, is not handled on frequency domain;
By the specific implementation of the invention described above, among the present invention, the match of channel quality curve is limited to the Resource Block between up-to-date two subbands that report, and the granularity of channel quality curve fit is wireless resource block (RB).Thereby can bring following advantage:
1, the channel-quality feedback mechanism of protocol compliant regulation;
2, provide channel quality information completely on the frequency domain to scheduling, information integrity is good;
3, the CQI curve fit is only according to ageing good subband CQI report;
4, the complexity of algorithm realization is low.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (3)
1. a method of obtaining complete channel quality information of downlink frequency domain is characterized in that, this method comprises:
In subband CQI fed back in turn at interval, following operation was carried out in the base station after the subband report of each reception UE feedback:
In the current sub of this subband report indication, the MCS index value of pairing each RB of this current subband is set to the MCS index value that carries in this subband report;
The MCS index value that carries in MCS index value that carries in the subband report according to UE feedback in the last CQI feedback cycle and the report of this subband is estimated the MCS index value of all RB between the subband of subband report last time indication and the described current sub by the curve fit mode.
2. method according to claim 1 is characterized in that, during the MCS index value of all RB, this method further comprises between the subband of estimating subband report last time indication and described current sub:
For the subband of subband numbering in the frequency band at current sub place less than described current sub, whether the MCS index value that estimates of judging each RB in the respective sub-bands is greater than the MCS index value that carries in this subband report, if then the MCS index value with corresponding RB is updated to the MCS index value that carries in this subband report.
3. according to claim 1 or described method, it is characterized in that, describedly be estimated as by the curve fit mode: the fitting a straight line by point-to-point transmission carries out described estimation.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104883742A (en) * | 2015-05-20 | 2015-09-02 | 香港应用科技研究院有限公司 | Channel quality estimation for wireless channel |
| CN109219066A (en) * | 2017-07-03 | 2019-01-15 | 中兴通讯股份有限公司 | A kind of wireless communications method, base station and user equipment |
| CN110557762A (en) * | 2018-05-30 | 2019-12-10 | 中国移动通信有限公司研究院 | Information reporting method, information reporting configuration method, terminal and network side equipment |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9722758B2 (en) | 2015-05-20 | 2017-08-01 | Hong Kong Applied Science and Technology Research Institute Company Limited | Channel-quality estimation for a wireless channel |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101223713A (en) * | 2005-06-10 | 2008-07-16 | 株式会社Ntt都科摩 | Wireless communication apparatus and wireless communication method |
| CN101513094A (en) * | 2006-09-05 | 2009-08-19 | 摩托罗拉公司 | Method and apparatus for providing channel quality feedback in a wireless communication system |
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2010
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101223713A (en) * | 2005-06-10 | 2008-07-16 | 株式会社Ntt都科摩 | Wireless communication apparatus and wireless communication method |
| CN101513094A (en) * | 2006-09-05 | 2009-08-19 | 摩托罗拉公司 | Method and apparatus for providing channel quality feedback in a wireless communication system |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104883742A (en) * | 2015-05-20 | 2015-09-02 | 香港应用科技研究院有限公司 | Channel quality estimation for wireless channel |
| CN104883742B (en) * | 2015-05-20 | 2018-07-06 | 香港应用科技研究院有限公司 | The channel quality estimation of wireless channel |
| CN109219066A (en) * | 2017-07-03 | 2019-01-15 | 中兴通讯股份有限公司 | A kind of wireless communications method, base station and user equipment |
| US11233600B2 (en) | 2017-07-03 | 2022-01-25 | Xi'an Zhongxing New Software Co., Ltd. | Wireless communication method, evolved NodeB and user equipment |
| CN110557762A (en) * | 2018-05-30 | 2019-12-10 | 中国移动通信有限公司研究院 | Information reporting method, information reporting configuration method, terminal and network side equipment |
| US11910215B2 (en) | 2018-05-30 | 2024-02-20 | China Mobile Communication Co., Ltd Research Institute | Information reporting method, information reporting configuration method, user equipment and network side device |
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