CN103378930A - Method for updating of channel quality indicating information of base station - Google Patents
Method for updating of channel quality indicating information of base station Download PDFInfo
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- CN103378930A CN103378930A CN2012101264667A CN201210126466A CN103378930A CN 103378930 A CN103378930 A CN 103378930A CN 2012101264667 A CN2012101264667 A CN 2012101264667A CN 201210126466 A CN201210126466 A CN 201210126466A CN 103378930 A CN103378930 A CN 103378930A
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Abstract
The invention provides a method for updating channel quality indicating information of a base station. The method for updating the channel quality indicating information of the base station comprises the steps that (A) user equipment reports the broadband CQI and the CQI of an optimal sub-band of each broadband component BP; (B) the CQI of the optimal sub-band is updated by the base station according to the reported CQI of the optimal sub-band, and the CQIs of all the sub-bands except the optimal sub-band are updated according to the weighted value of the CQI of the optimal sub-band and the weighted value of the broadband CQI. The method for updating the channel quality indicating information of the base station has the advantages of being capable of improving the accuracy of channel measurement on the premise that the signaling overheads of the system are not increased and excessive processing time delay of the base station end is avoided, simple and easy to realize.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to the method that channel quality indication (CQI) information is upgraded in a kind of base station.
Background technology
Along with the development of mobile communication technology, every key technology of the Long Term Evolution project (LTE, Long Time Evolution) that 3GPP initiates has been tending towards maturation and refinement.The principle of the link adaptation techniques among the LTE is dynamically adjustment information data rate of link circuit self-adapting, and according to wireless channel to each user's match channels capacity.It is to realize the important prerequisite of link circuit self-adapting that channel quality indication (CQI) reports mechanism.
In the downlink transmission of LTE, select suitable modulating-coding grade (MCS) for assistant base station (eNodeB), UE need to report CQI.UE obtains CQI by the down link received signal quality is measured, and described down link receives signal and is generally downlink reference signal.
The frequent report of CQI can be so that channel and disturbance variable reach best coupling on the time domain, and high-resolution can be carried out frequency domain dispatching better on the frequency domain.But they all cause the increase of uplink feedback expense, therefore eNodeB need to dispose renewal rate on the time domain and the CQI granularity on the frequency domain, in order between the accuracy of the CQI amount of information of UE report and adaptive modulation and coding (AMC, Automatism Adaptation Modulate Coding) match channels condition, trade off.
CQI reporting period and frequency granularity that UE uses all are to be controlled by eNodeB.On time domain, support cycle and aperiodic, CQI reported.Wherein, periodically report pattern can pass through physical uplink control channel (PUCCH) feedback, when UE is scheduled transmission Physical Uplink Shared Channel (PUSCH), also can feed back by PUSCH.The frequency granularity that CQI reports is that each subband bandwidth is made of k continuous Physical Resource Block (PRB) by (N) of the subband bandwidth number decision of definition, and the size of K value depends on the CQI reporting types of consideration.
Select subband CQI for UE, what the CQI of a certain subframe described is the channel quality of several specific parts of a specific part or bandwidth component (BP, Bandwidth Part).About shown in being described below of BP:
1, the whole system bandwidth
In comprise altogether N subband
Wherein k is the subband size.And if
The size of a subband is so:
2, one BPj are by N
jIndividual subband forms, and it is continuous on the frequency domain, and wherein the size of the leap subband set S of J bandwidth is relevant with system bandwidth, if J=1, so N
jEqual
If J＞1, so N
jEqual
Or equal
3, each BPj sorts according to the increase of frequency, wherein 0≤j≤J-1
4, select the subband feedback for UE, will be from the N of a BP
jSelect a single subband in the individual subband, carry simultaneously the station location marker of a L bit, be defined as:
In the prior art, the broadband CQI that UE adopts and the report method of subband CQI comprise the steps: as shown in Figure 1
Step 101:UE calculates broadband CQI and subband CQI in corresponding subframe;
Step 102:UE reports broadband CQI in the subframe that broadband CQI reports;
Step 103: in the subframe that UE selection subband CQI reports, select a preferred subband in N the subband from each BP (total J BP) and report subband CQI.
In the prior art, UE selects subband optimum among the BP to report subband CQI, after eNodeB receives CQI and sub-band flags position, only upgrades the CQI of respective sub-bands.Like this, in and the situation that the CQI report cycle is long relatively good at channel condition, the CQI of some subbands can be optimum a very long time, therefore this subband can obtain the chance that reports always, but the CQI of other subbands can not get upgrading for a long time in the BP, and the selection scheduling Algorithm Performance may reduce greatly frequently.This be since scheduler when receiving information and UE be scheduled between channel quality the cause of very large potential variation can occur.
Summary of the invention
The invention provides a kind of base station and upgrade the method for channel quality indication (CQI) information, the CQI of the non-optimum subband that can upgrade in time improves the frequently performance of selection scheduling.
The embodiment of the invention provides a kind of base station to upgrade the method for channel quality indication (CQI) information, comprises the steps:
The CQI of optimum subband in A, user equipment to report broadband CQI and each the bandwidth component BP;
B, base station upgrade the CQI of this optimum subband according to the CQI of the optimum subband that reports, and upgrade the CQI of other subbands except described optimum subband according to the weighted value of the CQI of optimum subband and broadband CQI.
Preferably, the base station arranges respectively a timer for each bandwidth component BP, further comprises after the step B:
Timer clear 0 corresponding to BP of CQI will be upgraded in C, base station;
D, base station judge whether the timer of each BP reaches predetermined threshold value, if there is the timer of any BP to reach predetermined threshold value, and execution in step E, otherwise return steps A;
E, base station upgrade CQI in this BP with broadband CQI, and the timer that described BP is corresponding is clear 0, then returns steps A.
As can be seen from the above technical solutions, the optimum subband CQI that reports in BP at the base station end upgrades the CQI of this subband, upgrades the CQI of other subbands in the BP with the weighted value of the broadband CQI that reports and optimum subband CQI.According to the frequency domain correlation principle, the channel of nearby frequency bands has correlation.In the very little scene of some Time Delay of Systems expansions, in the situation of the decline height correlation in signal bandwidth, the decline of whole bandwidth is approximately equalised.Therefore, compare and the CQI that receives recently, upgrade can not get for a long time the subband that upgrades with the broadband that reports or optimum subband CQI, more can be near real channel conditions.Therefore, the present invention program can not make system increase signaling consumption, and the base station end also can not increase in the situation of too many processing delay, has increased the accuracy of channel quality measurement, and is simple and easy to realize.
Description of drawings
Fig. 1 is the broadband CQI of UE employing of the prior art and the report method schematic diagram of subband CQI;
Fig. 2 processes the method flow schematic diagram that UE reports broadband CQI and subband CQI for the base station that the embodiment of the invention provides.
Embodiment
Can find out that by the analysis to prior art concerning with the subband that can not get for a long time upgrading CQI, because the continuous variation of channel status, it is very inaccurate that the CQI that receives has recently become, and can not mate present channel quality.According to the frequency domain correlation principle, the channel of nearby frequency bands has correlation.In the very little scene of some Time Delay of Systems expansions, in the situation of the decline height correlation in signal bandwidth, the decline of whole bandwidth is approximately equalised.Therefore, compare and the CQI that receives recently, upgrade can not get for a long time the subband that upgrades with the broadband that reports or optimum subband CQI, more can be near real channel conditions.
Main thought of the present invention is: the optimum subband CQI that reports in BP at the base station end upgrades the CQI of this subband, upgrades the CQI of other subbands in the BP with the weighted value of the broadband CQI that reports and optimum subband CQI.Preferably, for each BP a timer is set respectively in the base station, with the number of times that CQI does not upgrade in the update cycle at high level configuration CQI in each BP among the statistics UE, i.e. each BP time of not upgrading.After not reaching the timer threshold value update time, upgrade the CQI of subband in this BP with the broadband that reports.Do not make system increase signaling consumption like this, the base station end also can not increase in the situation of too many processing delay, has increased the accuracy of channel quality measurement, and is simple and easy to realize.
Clearer for the know-why, characteristics and the technique effect that make technical solution of the present invention, below in conjunction with specific embodiment the present invention program is described in detail.
The embodiment of the invention provides a kind of base station end to process the method that UE reports CQI information.The method has increased a timer at the base station end, is used for the time that subband does not obtain upgrading in the statistics BP.Concrete implementing procedure comprises the steps: as shown in Figure 2
Step 201: dispatch according to receiving the broadband CQI that UE reports the base station.
In the subframe that overall with band CQI reports, each UE in the residential quarter successfully reports an overall with band CQI separately.The base station is according to reporting the broadband CQI information of upgrading corresponding UE and dispatching.
Step 202:UE reports the CQI of optimum subband in the BP.
Step 203: the CQI of optimum subband in the BP that the base station reports according to UE, upgrade the CQI of optimum subband in the described BP.
Step 204: the CQI of described other subbands of BP is upgraded with the weighted value of the CQI of optimum subband and broadband CQI in the base station, and with timer clear 0.
In the subframe of selecting subband CQI to report, UE need to select the subband of an optimum to report in the sets of subbands N of BPj, and reports the flag bit in whole sets of subbands of optimum subband, and each BP will report when successfully obtaining reporting chance separately in turn.The base station basis reports this optimum subband CQI information in the BP that upgrades corresponding UE, and upgrades the CQI of other subbands in the BP with broadband CQI and this optimum subband CQI weighted value.In the subframe that BPj reports, the sign of the optimum subband that the base station reports according to UE is upgraded the CQI of this subband, the timer zero clearing in this BP.
Step 205: the base station judges whether the timer in the BP reaches predetermined threshold value, if, execution in step 206, otherwise return step 201.
Step 206: upgrade CQI in this BP with broadband CQI, and timer is clear 0, then return step 201.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (2)
1. the method for a base station renewal channel quality indication (CQI) information is characterized in that, comprises the steps:
The CQI of optimum subband in A, user equipment to report broadband CQI and each the bandwidth component BP;
B, base station upgrade the CQI of this optimum subband according to the CQI of the optimum subband that reports, and upgrade the CQI of other subbands except described optimum subband according to the weighted value of the CQI of optimum subband and broadband CQI.
2. method according to claim 1 is characterized in that, the base station arranges respectively a timer for each bandwidth component BP, further comprises after the step B:
Timer clear 0 corresponding to BP of CQI will be upgraded in C, base station;
D, base station judge whether the timer of each BP reaches predetermined threshold value, if there is the timer of any BP to reach predetermined threshold value, and execution in step E, otherwise return steps A;
E, base station upgrade CQI in this BP with broadband CQI, and the timer that described BP is corresponding is clear 0, then returns steps A.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107872830A (en) * | 2016-09-28 | 2018-04-03 | 联芯科技有限公司 | Calculate the method and apparatus of channel quality instruction |
| WO2020077623A1 (en) * | 2018-10-19 | 2020-04-23 | 北京小米移动软件有限公司 | Timing configuration method and apparatus |
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| CN101277166A (en) * | 2008-04-03 | 2008-10-01 | 中兴通讯股份有限公司 | Method for feedback of channel quality indication |
| CN101351052A (en) * | 2008-09-22 | 2009-01-21 | 华为技术有限公司 | Method, system and equipment for distributing transmission resource |
| WO2011097796A1 (en) * | 2010-02-10 | 2011-08-18 | Telefonaktiebolaget Lm Ericsson | Method and arrangement in a telecommunications system |
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2012
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| CN101277166A (en) * | 2008-04-03 | 2008-10-01 | 中兴通讯股份有限公司 | Method for feedback of channel quality indication |
| CN101351052A (en) * | 2008-09-22 | 2009-01-21 | 华为技术有限公司 | Method, system and equipment for distributing transmission resource |
| WO2011097796A1 (en) * | 2010-02-10 | 2011-08-18 | Telefonaktiebolaget Lm Ericsson | Method and arrangement in a telecommunications system |
Non-Patent Citations (2)
| Title |
|---|
| NORTEL，3GPP: "《3GPP TSG-Ran Working Group 1 Meeting #53-bis R1-082511 Discussion on Sub-band CQI Measurement》", 4 July 2008 * |
| QUALCOMM EUROPE，3GPP: "《3GPP TSG-RAN WG1 #54 R1-083180 Clarifying UE-selected subband CQI report on PUCCH》", 22 August 2008 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107872830A (en) * | 2016-09-28 | 2018-04-03 | 联芯科技有限公司 | Calculate the method and apparatus of channel quality instruction |
| WO2020077623A1 (en) * | 2018-10-19 | 2020-04-23 | 北京小米移动软件有限公司 | Timing configuration method and apparatus |
| US11646856B2 (en) | 2018-10-19 | 2023-05-09 | Beijing Xiaomi Mobile Software Co., Ltd. | Timing configuration method and apparatus |
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Application publication date: 20131030 |