CN102611521B - Adjusting method for channel quality indicator (CQI) - Google Patents
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Abstract
The invention provides an adjusting method for a channel quality indicator (CQI). According to the method, the CQI adjustment of a current subframe is carried out only when the current subframe is judged to be the subframe generated after the last CQI adjustment takes effect. In this way, a feedback result for the current CQI adjustment can be guaranteed to be the feedback result counted after the last CQI adjustment takes effect, so that the precision of the current CQI adjustment can be guaranteed. In addition, the length of a feedback result window for counting the number of error blocks is limited, so that the feedback result for the current CQI adjustment can be guaranteed to better reflect the current channel state, therefore, the process of the current CQI adjustment is more precise.
Description
Technical field
The present invention relates to the data transmission technology in mobile communication system, particularly relate to the method for adjustment of the channel quality instruction in high-speed physical downlink shared channel (HS-PDSCH) (HS-PDSCH) transmission.
Background technology
HSDPA and HSPA+ system adopts Adaptive Modulation and Coding (AMC) to carry out elevator system performance, and the user that channel circumstance is good adopts high order modulation encoding scheme, and the user of channel circumstance difference adopts low-order-modulated encoding scheme.The process realizing AMC comprises: subscriber equipment (UE) measure channel quality, table look-up according to the channel quality measured and produce channel quality instruction (CQI), this CQI comprises the transmission block size (RTBS) that namely two parts information recommend and the modulation system (RMF) of recommending, UE also feeds back CQI, the Modulation and Coding Scheme adopted when Node B determines that data send next time according to the CQI that UE feeds back, when feeding back NACK or the ACK information of present frame transmission to base station (Node B) simultaneously.
In above-mentioned AMC process, Node B determines the transformat of data transmission next time according to CQI, and whether determined transformat accurately will have influence on link Block Error Rate, and the accuracy of the CQI of visual user feedback has direct impact to link Block Error Rate.And it is not the CQI of UE feedback is owing to being subject to the impact of measure error and time delay in actual applications, often very accurate, link layer Block Error Rate therefore can be caused higher.
The CQI measured for UE in practical application is difficult to situation accurately, normally revise CQI according to HS-DSCH BLER statistic information, or by carrying out channel estimating to up HS-SICH, utilize up-downgoing channel relevancy to revise CQI, or revise CQI by business code check, with the problem that offset measurement accuracy is bad.
Proposed several Adjusted Option to channel quality misregister at present, such as, Chinese Patent Application No. is in the technical scheme of CN200510115499.1, proposes by monitoring that the Block Error Rate of high speed descending sharing channel adjusts to the RTBS in CQI; Chinese Patent Application No. is in the technical scheme of CN200710063350.2, propose the method in the generation of UE end and adjustment CQI, the pattern of adjustment has coarse mode and fine setting pattern, wherein finely tuning pattern is adjust CQI by Block Error Rate (BLER), coarse mode is then obtained by signal interference ratio (SIR) table look-at, and the use boundary of coarse adjustment and fine setting is whether the adjacent SIR variable quantity receiving data for twice exceedes certain higher limit; Chinese Patent Application No. is in the scheme of CN200810104651.X, and what propose to reduce to eat dishes without rice or wine is dithered as object, with reference to ACK, NACK and RTBS in tolerance window, adjusts the RTBS of current C QI.
Revise in the scheme of CQI above by HS-DSCH BLER statistic information, do not consider channel correlation in time, that is, if the time window length of observing Block Error Rate is excessive, the channel of window head and corresponding two time points of afterbody will not have correlation, and the mistake block situation at previous time point place is the deviation that do not reflect at present feedback CQI, now, recycle the Block Error Rate observed in this time window and carry out adjustment CQI, the Block Error Rate after adjusting can be caused to increase.
In addition, in actual applications, many base stations are carried out data based on the CQI after adjustment and are sent to and receive UE and send for these data the Adjustment effect that the ACK that feeds back or nack message learn this CQI, the delay between this in sequential for some time.And after having adjusted a CQI, whether to adjust next time, and how to carry out adjusting be based upon before once adjust CQI come into force after statistics Block Error Rate basis on, with the decision guaranteeing to carry out adjustment next time and the accuracy of adjustment of carrying out.And in technique scheme, and reckon without this point, therefore during CQI adjustment, the Block Error Rate of reference does not inherently meet the demand of reference, causes CQI to adjust and there is error.
Summary of the invention
In view of this, main purpose of the present invention is the method for adjustment providing a kind of channel quality to indicate, and the method effectively can improve the accuracy of CQI adjustment.
In order to achieve the above object, the technical scheme that the present invention proposes is:
A method of adjustment for channel quality instruction, the method comprises the following steps:
A, when entering each subframe, base station judges that whether present sub-frame is the subframe after the CQI of adjustment last time comes into force, and if so, then performs step b, otherwise, exit the CQI adjustment process of present sub-frame;
B, judge the length threshold T whether the length L of current feedback result window reaches default, if so, then delete the feedback result of current described feedback result window afterbody subframe;
C, insert the feedback result of present sub-frame at described feedback result window head, wherein, when present sub-frame does not receive the feedback result of subscriber equipment, the feedback result inserted is for being used to indicate without feedack; According to the feedback result of present sub-frame, upgrading described feedback result window internal feedback result is the number of sub-frames F of NACK, and to upgrade described feedback result window internal feedback outcome record be the number of sub-frames W of NACK or ACK;
D, length according to the current described F, the described W that determine and current described feedback result window, adjust the CQI that this receives.
In sum, the method of adjustment of the channel quality instruction that the present invention proposes, only when judging that present sub-frame is the subframe after the CQI adjusted last time comes into force, just carry out the CQI adjustment of present sub-frame, so, can guarantee for the feedback result of this adjustment CQI to be adjusted the feedback result of adding up after CQI comes into force last time, thus guarantee the accuracy that this CQI adjusts.In addition, by being limited within T by the length being used for the feedback result window adding up block number by mistake, can guarantee that the feedback result adjusted for this CQI can reflect current channel conditions preferably, this CQI being adjusted more accurate.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the embodiment of the present invention one.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, the present invention is described in further detail below in conjunction with the accompanying drawings and the specific embodiments.
Main thought of the present invention is: before whether decision carries out the adjustment of CQI in present sub-frame, first after will determining whether present frame is in the subframe that comes into force of the CQI of adjustment last time, only when being defined as being, again record is carried out to the feedback information of present sub-frame, and determine whether carry out CQI adjustment and perform correspondingly set-up procedure according to the recorded information in current feedback result window, like this, can guarantee for the feedback information of this adjustment CQI to be adjusted the information of adding up after CQI comes into force last time, thus guarantee the accuracy that this CQI adjusts.In addition, consider the impact that channel correlation in time adjusts CQI, here also the length limit of feedback result window is limited, to guarantee that the feedback information adjusted for this CQI can reflect current channel conditions preferably, this CQI is adjusted more accurate.
Fig. 1 is the schematic flow sheet of the embodiment of the present invention one.As shown in Figure 1, this embodiment mainly comprises:
Step 101, when entering each subframe, base station judges that whether present sub-frame is the subframe after the CQI of adjustment last time comes into force, and if so, then performs step 102, otherwise, exit the CQI adjustment process of present sub-frame.
Here, the CQI of described adjustment last time comes into force, and the CQI namely utilizing adjusted last time carries out transfer of data.
Utilize this step, the transfer of data after the feedback result information can guaranteeing after this for carrying out CQI adjustment all comes into force corresponding to the CQI of adjustment last time, more accurate to make the CQI in subsequent step adjust.
Step 102, judge the length threshold T whether the length L of current feedback result window reaches default, if so, then delete the feedback result of current described feedback result window afterbody subframe.
Here, the maximum length of described feedback result window is T to utilize this step to guarantee.
Described T, for limiting the maximum length of feedback result window, to guarantee that the feedback result information in the feedback result window that adjusts for this CQI has temporal correlation, namely, guarantee that the feedback result in window can reflect current channel conditions preferably, this CQI is adjusted more accurate.In actual applications, by emulation, those skilled in the art, according to actual needs, can determine that the feedback result can guaranteed in feedback result window has the better T value of temporal correlation, do not repeat them here.
Step 103, insert the feedback result of present sub-frame at described feedback result window head, wherein, when present sub-frame does not receive the feedback result of subscriber equipment, the feedback result inserted is for being used to indicate without feedack; According to the feedback result of present sub-frame, upgrading described feedback result window internal feedback result is the number of sub-frames F of NACK, and to upgrade described feedback result window internal feedback outcome record be the number of sub-frames W of NACK or ACK.
This step, for the feedback result according to present frame, upgrade the feedback result information in feedback result window, simultaneously, upgrade the mistake block number F of foundation when being used for CQI adjustment and the W in the effective sample space in feedback result window can be reflected, to carry out the adjustment of CQI in subsequent process based on these information.
In actual applications, if what adopt in system is non-adaptive retransmission, what use when the time-slot code channel resource block size then retransmitting use all passes with head with transmission block size is consistent, namely now retransfer scheduling does not change modulation coding mode when data block is transmitted first, if the data of loading error occurring are engraved in the transmission block size that last time, adjustment was recommended when transmitting first before, re-transmission result so subsequently has nothing to do with the transmission block size after adjustment, it is follow the transmission block size after adjusting to have nothing to do on the impact that Block Error Rate brings, so the nack message of the re-transmission corresponding to transmission before adjustment last time should not added up in described F, the NACK of this retransfer scheduling can not add up in feedback samples number W.
Therefore, adopt in systems in which be non-adaptive retransmission when, in order to improve the accuracy of added up F and W, preferably, if present sub-frame receives the feedback result of subscriber equipment, and when described feedback result corresponds to the re-transmission of the transfer of data before CQI adjustment last time, the feedback result inserted is for being used to indicate without feedack.Like this, just can make to adjust irrelevant feedback information with CQI last time and be excluded outside described F and W, thus guarantee the accuracy of carrying out this CQI adjustment in subsequent process.
In actual applications, can based on record in current described feedback result window the feedback result of promising NACK or ACK, upgrade described F, if the feedback result namely in present sub-frame is NACK, then F is performed and add an operation.Preferably, only can add up described F value according to the feedback result of limited quantity in current feedback result window, namely only utilize nearest Q the feedback result receiving the subframe of NACK or ACK, obtain described F, here, F reflects the mistake block number in Q sample, and the method for concrete renewal F is as follows:
Judge whether the number of sub-frames that feedback result in current described feedback result window is recorded as NACK or ACK is more than or equal to default statistical sample threshold value Q, if, then described F is that in current described feedback result window, nearest Q feedback result is that in the subframe of NACK or ACK, feedback result is the number of sub-frames of NACK, otherwise described F is the number of sub-frames that in current described feedback result window, feedback result is recorded as NACK.
Here; sample threshold Q; for limiting the sample space size used when statistics misses block number F; obvious Q should be less than described T; Q value only needs to guarantee that the F come out based on it can reflect channel conditions preferably in actual applications, and those skilled in the art can arrange suitable value by emulation to Q according to actual needs.
Step 104, length according to the current described F, the described W that determine and current described feedback result window, adjust the CQI that this receives.
Particularly, this step can adopt following method to realize:
Step 1041, judge whether described F exceedes default maximum NACK threshold value, if so, then according to R '=R-Step
down, the adjusting range R of current recommendation transmission block size is adjusted, performs step 1042, otherwise, judge whether described W is more than or equal to default statistical sample threshold value Q and described F is less than default minimum NACK threshold value, if so, then according to R '=R+Step
updescribed R is adjusted, perform step 1042, otherwise, judge whether the length of current described feedback result window reaches described T and in described feedback result window, whether the feedback result of all subframes is all recorded as and is used to indicate without feedack, if, then described R is reset to zero, perform step 1042, otherwise, exit the CQI adjustment process of present sub-frame.
Wherein, described R ' is the adjusting range of the recommendation transmission block size after adjustment, described Step
upstep-length is adjusted upward, described Step for what preset
downfor the downward adjustment step-length preset, Step
upand Step
downall be greater than 0.
In this step, mistake block number F according to current statistic is adjusted recommending the adjusting range of transmission block size, make this adjusting range more can accurately react the change of present channel environment, thus can guarantee that the adjustment after this carried out the recommendation transmission block size in CQI based on this adjusting range is more accurate.
Here; it should be noted that; the adjusting range of recommendation transmission block size obtained during each adjustment is using as the basis adjusted next time; that is; continuation to the adjustment of the adjusting range of recommending transmission block size; instead of this adjusting range is made zero, to guarantee, based on the adjustment of this adjusting range to CQI, there is continuation after each adjustment CQI.
Particularly, when F exceedes default maximum NACK threshold value, illustrate that current Block Error Rate is excessive, need the adjusting range reducing current recommendation transmission block size, now do not need to consider that whether the sample number in current feedback result window is abundant again, the adjusting range of direct minimizing current recommendation transmission block size, to reach the effect of falling soon.
When W is more than or equal to default statistical sample threshold value Q (i.e. minimum statistics sample number, reach the time of day that sample number that this value illustrates in current feedback result window can reflect present channel) and described F is less than default minimum NACK threshold value time, illustrate that current Block Error Rate is too small, can adopt to recommendation transmission block size the mode adjusted upward, namely increase the size of recommending transmission block.
When the length of feedback result window reach described T and in feedback result window the feedback result of all subframes be all recorded as be used to indicate without feedack time, illustrate that the long time does not use channel, channel quality has probably had larger change, the now previous adjustment to channel quality may no longer be applicable to current channel circumstance, therefore, here will the adjusting range R of transmission block size be recommended to reset to zero, no longer to adjust based on the transmission block size of adjusting range to user feedback of nonsensical recommendation transmission block size during adjustment next time.
Preferably, Step
up< Step
down, so, can reach and can reduce the error rate fast when error rate height, then can Quick high transfer rate when the error rate is very low, thus guarantee to improve throughput as much as possible under the prerequisite ensureing transmission Block Error Rate.
In actual applications, can also limit respectively the upper and lower bound of the adjusting range of recommending transmission block size, that is, prescribe a time limit when the R ' calculated is greater than the upper of adjusting range, then R ' value is this upper limit, prescribes a time limit when the R ' calculated is less than the lower of adjusting range, then R ' value is this lower limit, wherein, this upper limit is greater than zero, and this lower limit is less than zero.
Preferably, described minimum NACK threshold value, can be obtained by the product of Q and the minimum Block Error Rate of system, if result is not integer, then can round downwards.
Described maximum NACK threshold value, can add 1 by the product of Q and the maximum Block Error Rate of system and obtain, if result is not integer, then can round downwards.
In actual applications, if be not limited to by the sample space being used for adding up F within Q sample space, then the maximum NACK threshold value of upwards adjustment downwards and minimum NACK threshold value need to calculate in real time according to have feedback number of sub frames and maximum, the minimum Block Error Rate of system actual in feedback window.
Step 1042, according to described R ', according to TBsize=RTBS+R ', the recommendation transmission block size RTBS in this CQI received to be adjusted, after being adjusted recommendation transmission block size TBsize.
Here it should be noted that, in the existing CQI method of adjustment used in base station side, do not consider that the modulation system of feedback needs to do necessary change along with the adjustment of the transmission block size RTBS recommended, to obtain lower link Block Error Rate.Preferably, in this step, can adjust accordingly recommendation modulation system while adjustment transmission block size, to make the change of used modulation system adaptive channel environment as much as possible, and then obtain lower link Block Error Rate.The method of concrete adjustment modulation system is as follows:
According to ρ=TBsize/B, transmission block code efficiency ρ when recommendation modulation system in this CQI received of calculating employing and transmission block size are TBsize, wherein, B is the data volume that the Resource Block shared by transmission block corresponding to recommendation transmission block size under recommendation modulation system in the CQI adopting this to receive in this CQI received can carry.
When described ρ is greater than the most high coding efficiency recommending modulation system corresponding described in default modulation coding mode conversion table, using the modulation system than described recommendation modulation system higher order as the recommendation modulation system after adjustment, according to the recommendation modulation system after adjustment and described TBsize, calculate the transmission block code efficiency ρ ' when adopting the recommendation modulation system after adjusting and transmission block size to be TBsize.
When described ρ is less than the minimum code efficiency of recommending modulation system corresponding described in default modulation coding mode conversion table, using the modulation system of single order lower than described recommendation modulation system as the recommendation modulation system after adjustment, according to the recommendation modulation system after adjustment and described TBsize, calculate the transmission block code efficiency ρ ' when adopting the recommendation modulation system after adjusting and transmission block size to be TBsize.
Here, the method calculating the method for ρ ' and aforementioned calculating ρ is similar, does not repeat them here.
Step 1043, current described feedback result window to be emptied.
Here, after the recommendation modulation system adjustment in the CQI received this, need feedback result window to empty, to be applied in CQI adjustment next time.
In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a method of adjustment for channel quality indicator (CQI), is characterized in that, the method comprises the following steps:
A, when entering each subframe, base station judges that whether present sub-frame is the subframe after the CQI of adjustment last time comes into force, and if so, then performs step b, otherwise, exit the CQI adjustment process of present sub-frame;
B, judge the length threshold T whether the length L of current feedback result window reaches default, if so, then delete the feedback result of current described feedback result window afterbody subframe;
C, insert the feedback result of present sub-frame at described feedback result window head, wherein, when present sub-frame does not receive the feedback result of subscriber equipment, the feedback result inserted is for being used to indicate without feedack; According to the feedback result of present sub-frame, upgrading described feedback result window internal feedback result is the number of sub-frames F of NACK, and to upgrade described feedback result window internal feedback outcome record be the number of sub-frames W of NACK or ACK;
D, length according to the current described F, the described W that determine and current described feedback result window, adjust the CQI that this receives;
Described steps d is:
D1, judge whether described F exceedes default maximum NACK threshold value, if so, then according to R '=R-Step
down, the adjusting range R of the recommendation transmission block size in the CQI receive this adjusts, and performs steps d 2, otherwise, judge whether described W is more than or equal to default statistical sample threshold value Q and described F is less than default minimum NACK threshold value, if so, then according to R '=R+Step
updescribed R is adjusted, perform steps d 2, otherwise, judge whether the length of current described feedback result window reaches described T and in described feedback result window, whether the feedback result of all subframes is all recorded as and is used to indicate without feedack, if, then described R is reset to zero, perform steps d 2, otherwise, exit the CQI adjustment process of present sub-frame; Wherein, described R ' is the adjusting range of the recommendation transmission block size after adjustment, described Step
upstep-length is adjusted upward, 0 < Step for what preset
up, described Step
downfor the downward adjustment step-length preset, 0 < Step
down;
D2, utilize described R ', according to TBsize=RTBS+R ', the recommendation transmission block size RTBS in this CQI received is adjusted, the recommendation transmission block size TBsize after being adjusted;
D3, current described feedback result window to be emptied.
2. method according to claim 1, it is characterized in that, step c comprises further: when receiving feedback result in present sub-frame, and when described feedback result corresponds to the re-transmission of the transfer of data before CQI adjustment last time, the feedback result inserted is for being used to indicate without feedack.
3. method according to claim 1, is characterized in that, upgrades described F to be in step c:
Judge whether the number of sub-frames that feedback result in current described feedback result window is recorded as NACK or ACK is more than or equal to default statistical sample threshold value Q, if, then described F is that in current described feedback result window, nearest Q feedback result is that in the subframe of NACK or ACK, feedback result is the number of sub-frames of NACK, otherwise described F is the number of sub-frames that in current described feedback result window, feedback result is recorded as NACK.
4. method according to claim 1, is characterized in that, Step
up< Step
down.
5. method according to claim 1, is characterized in that, described steps d 2 comprises further: according to the recommendation transmission block size TBsize after described adjustment, and the recommendation modulation system in the CQI receive this adjusts.
6. method according to claim 5, is characterized in that, described to this receive CQI in recommendation modulation system be adjusted to:
According to ρ=TBsizeB, transmission block code efficiency ρ when recommendation modulation system in this CQI received of calculating employing and transmission block size are TBsize, wherein, B is the data volume that the Resource Block shared by transmission block corresponding to recommendation transmission block size under recommendation modulation system in the CQI adopting this to receive in this CQI received can carry;
When described ρ is greater than the most high coding efficiency recommending modulation system corresponding described in default modulation coding mode conversion table, using the modulation system than described recommendation modulation system higher order as the recommendation modulation system after adjustment, according to the recommendation modulation system after adjustment and described TBsize, calculate the transmission block code efficiency ρ ' when adopting the recommendation modulation system after adjusting and transmission block size to be TBsize;
When described ρ is less than the minimum code efficiency of recommending modulation system corresponding described in default modulation coding mode conversion table, using the modulation system of single order lower than described recommendation modulation system as the recommendation modulation system after adjustment, according to the recommendation modulation system after adjustment and described TBsize, calculate the transmission block code efficiency ρ ' when adopting the recommendation modulation system after adjusting and transmission block size to be TBsize.
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| CN103701572A (en) * | 2012-09-27 | 2014-04-02 | 普天信息技术研究院有限公司 | Method and device for indicating quality of channel |
| CN103067220B (en) * | 2012-12-19 | 2016-02-10 | 中兴通讯股份有限公司 | Two-way link forwarding detection (BFD) method and device under parameter update status |
| CN104468025B (en) * | 2013-09-23 | 2018-03-16 | 联芯科技有限公司 | The system of selection of channel quality indicator (CQI) and device |
| CN105940705B (en) * | 2014-01-31 | 2019-06-18 | 诺基亚技术有限公司 | The method and apparatus that BLER for MBMS is measured |
| CN104734812B (en) * | 2015-03-18 | 2017-12-26 | 京信通信系统（广州）有限公司 | A kind of method and apparatus for determining modulation coding mode |
| EP4128609A4 (en) * | 2020-03-30 | 2023-10-25 | Qualcomm Incorporated | Two-stage feedback procedures |
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| CN101567750A (en) * | 2008-04-22 | 2009-10-28 | 大唐移动通信设备有限公司 | Cqi correction method and base station |
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| CN101132227A (en) * | 2006-08-23 | 2008-02-27 | 大唐移动通信设备有限公司 | Monitoring method and system for wireless communication signal channel quality |
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