CN103580784B - Based on channel quality instruction selecting modulation mode, the method for code check and base station - Google Patents
Based on channel quality instruction selecting modulation mode, the method for code check and base station Download PDFInfo
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Abstract
The present invention relates to a kind of based on channel quality instruction selecting modulation mode, the method for code check and base station.This method includes：CQI receiving steps, channel quality instruction (CQI) measured value that base station receiving terminal reports；Ability judgment step, base station judge whether to need whether CQI information under different condition and the terminal have the reporting ability for reporting CQI information under different condition；CQI corrects step, judges to need CQI information under different condition and when the terminal does not possess the reporting ability, the CQI measured value amendments that the base station reports according to the terminal obtain the final CQI correction values under different condition；Modulation selection step, when dispatching the terminal, the base station is according to final CQI correction values selecting modulation mode, the code check under the current respective conditions of the terminal.The inventive method and base station can improve throughput of system and spectrum efficiency.
Description
Technical field
The present invention relates to wireless communication field, more particularly to a kind of channel quality that is based on to indicate selecting modulation mode, code check
Method and base station.
Background technology
In a wireless communication system, in order to preferably select suitable modulation system, code check according to down channel quality
And MIMO method, base station, which needs to measure channel quality, to be reported.For downlink, terminal device UE measurement down channels
The channel quality indication (CQI) information of downlink is simultaneously reported base station by quality；For up-link, base station measurement up channel matter
Measure and the channel quality indication (CQI) information of up-link is reported to the related scheduler module of base station.In a wireless communication system, by
In measurement error or the channel variation of measurement moment and transmission time, the channel quality information reported may be inaccurate, base station
Transmission performance such as the ACK/NACK numbers or block error rate BLER etc. according to reality are needed, to the channel quality indication (CQI) information reported
Calculating is modified, recycles revised channel quality information to select suitable modulation system, code check etc..In LTE system,
For in downlink, UE reports the channel quality indicator CQI information of downlink；Base station is directly based upon the CQI letters that UE is reported
Breath selects suitable modulation system, code check and MIMO method, or the CQI information reported based on UE, and according to link transmission
Energy such as ACK/NACK numbers or block error rate BLER, are modified to CQI, utilize revised CQI to select suitable modulation
Mode, code check etc..
For the channel quality under different condition, scene, existing processing mode has two kinds：First, for different condition, field
Scape, channel quality information measurement being carried out respectively and is reported, this mode needs increase instruction different condition, the signaling consumption of scene
Supported with agreement, and increase the expense that channel quality reports；Second, different condition, scene are uniformly measured and reported,
Existing channel quality indication (CQI) information modification method is all repaiied to the channel quality indication (CQI) information under all conditions, scene using identical
Correction method, the different channel qualities under different condition, scene are not distinguished；Now, indicate to believe based on existing channel quality
Modulation system, the unsuitable different condition of code check, the scene selected by modification method are ceased, influences throughput of system.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of side based on channel quality instruction selecting modulation mode, code check
Method and base station, to solve the problems, such as that throughput of system is impacted.
In order to solve the above technical problems, the invention provides one kind based on channel quality instruction selecting modulation mode, code check
Method, this method includes：
CQI receiving steps, channel quality instruction (CQI) measured value that base station receiving terminal reports；
Ability judgment step, base station judge whether to need whether CQI information under different condition and the terminal have
Report the reporting ability of CQI information under different condition；
CQI corrects step, judges to need the CQI information under different condition and the terminal does not possess the reporting ability
When, the CQI measured value amendments that the base station reports according to the terminal obtain the final CQI correction values under different condition；
Modulation selection step, when dispatching the terminal, the base station is according to final under the current respective conditions of the terminal
CQI correction values selecting modulation mode, code check.
In order to solve the above-mentioned technical problem, present invention also offers a kind of base station, the base station to include：
CQI receiving modules, (CQI) measured value is indicated for the channel quality that receiving terminal reports；
Ability judge module, for judging whether to need whether CQI information under different condition and the terminal have
Report the reporting ability of CQI information under different condition；
CQI correcting modules, do not possess described report for the CQI information under needing different condition in judgement and the terminal
During ability, the CQI measured value amendments reported according to the terminal obtain the final CQI correction values under different condition；
Selecting module is modulated, when dispatching the terminal, for being repaiied according to the final CQI under the current respective conditions of the terminal
On the occasion of selecting modulation mode, code check.
The CQI information and terminal of the inventive method and base station in the case where judgement needs different condition, which do not possess, reports different bars
Under part during the reporting ability of CQI information, channel quality instruction is corrected respectively based on different condition so that revised amendment channel
The channel quality and suitable modulation system and code check that quality instruction can reflect under different condition, so as to improve system throughput
Amount, improve system effectiveness.
Brief description of the drawings
Fig. 1 is schematic diagram of the present invention based on channel quality instruction selecting modulation mode, the embodiment of the method for code check；
Fig. 2 is the idiographic flow schematic diagram of step 103 in Fig. 1；
Fig. 3 is the modular structure schematic diagram of base station embodiment of the present invention；
Fig. 4 is another modular structure schematic diagram of base station embodiment of the present invention.
Embodiment
Below by taking the heterogeneous network of lte-a system as an example, it is different to illustrate that the channel quality under different condition, scene is present,
And existing channel quality indication (CQI) information modification method does not account for such case.
LTE-A R10 standards introduce the support to heterogeneous network, i.e., make wide covering with high power node, and in hot spot region
Or fringe region low power nodes repeat covering to strengthen performance, improve throughput of system.Because low power nodes are descending
Transmit power is relatively low, is directly weighed with descending received signal quality, the coverage very little of low power nodes, it is impossible to played
The effect of the shunting UE transmission requirements of effect；Therefore, typically can be by setting cell to select for more preferable streamed data transmission requirement
The methods of selecting bias parameters, expand the coverage of low power nodes.Such that low power nodes expand the edge of covering
In region, the downstream signal power of low power nodes is less than high power node power, and the downstream signal of high power node can be to low
The UE of the fringe region of power node causes strong jamming.Therefore, in order to solve this interference problem, it is necessary to introduce eICIC technologies.
EICIC technologies are by setting high power node ABS subframes (the almost subframe of blank, Almost Blank Subframe), making
Data receiver, accurate measurement can carried out by obtaining the UE of low power nodes in subframe corresponding to high power node ABS subframes
Deng because almost not having high power node strong jamming now, the UE of low power nodes downlink channel quality is preferable.It is very bright
It is aobvious it is recognised that in the ABS subframes and normal sub-frames (non-ABS subframes) of high power node, what the UE of low power nodes was subject to
Interference characteristic is inconsistent so that measurement result is also different, i.e. the ABS subframes of high power node and normal sub-frames (non-ABS subframes)
It is different scenes for the UE of low power nodes, its channel quality is also different.In order to preferably support eICIC, LTE
R10 standards introduce measurement Subset indication signaling, inform that R10UE carries out serving cell, the RRM/ of adjacent cell in which subset
RLM is measured and CQI is measured etc., and more accurately to obtain measurement amount, and the result of measurement amount has uniformity.
But, the introducing of the eICIC technologies of heterogeneous network, the UE measurements to R8/9 bring the problem of new.It is, it is clear that right
For the UE of low power nodes, in the ABS subframes of high power node, almost without high power node strong jamming, descending chain
Path channels quality is preferable, and the CQI for measuring to obtain is also higher；And in the normal sub-frames (non-ABS subframes) of high power node, low work(
The UE of rate node is by high power node compared with strong jamming, and downlink channel quality is poor, and the CQI for measuring to obtain is relatively low, also
It is to say in the ABS subframes and normal sub-frames (non-ABS subframes) of high power node, the low power nodes UE interference characteristic being subject to
It is inconsistent so that measurement result is also different, i.e., the ABS subframes of high power node and normal sub-frames (non-ABS subframes) are to low work(
It is different scenes for the UE of rate node, its channel quality is also different.But R8/9 UE can not can receive as R10UE
Measurement Subset indication signaling, R8/9UE measurements are that UE itself is determined using which subframe；Therefore, base station can not judge R8/9's
UE measurement using which subframe, reflect the down channel quality of which subframe, also can not just know R8/9 UE feedbacks
CQI and ABS subframes, the relation of the channel quality of normal sub-frames (non-ABS subframes).If directly using CQI or with traditional
CQI selecting modulation modes, the code check corrected after CQI modification methods, it is difficult to accurately reflect downlink quality, cause modulation methods
Formula, code rate selection are improper, influence throughput of system, such as in the subframe corresponding to the ABS subframes in high power node, low work(
Rate node UE channel qualities are preferable, relatively low based on the modulation system selected by feedback CQI, code check, cause handling capacity to obtain
Effectively lifting；And in the subframe corresponding to the ABS subframes in high power node, low power nodes UE channel qualities are poor, are based on
Modulation system, code check selected by feedback CQI is higher, causes BLER larger, number of retransmissions is more, and handling capacity is relatively low.In a word, due to
Base station can not know that the CQI of R8/9UE feedbacks has reacted channel quality in which subframe, directly use CQI or with tradition side
Method amendment CQI comes selecting modulation mode, code check, can make it that the modulation system of selection, code rate selection are improper, influence system throughput
Amount.
As shown in figure 1, method of the present invention based on channel quality instruction selecting modulation mode, code check, this method include：
Step 101：CQI receiving steps, channel quality instruction (CQI) measured value that base station receiving terminal reports；
Step 102：Whether ability judgment step, base station judge whether to need CQI information under different condition and terminal
With the reporting ability for reporting CQI information under different condition；
Understandably, if base station judges to need CQI information under different condition and terminal possesses and reports different condition
Under CQI information ability, then in step 101, base station can receive CQI measured values or correction value under different condition, base station
Corresponding coded system, code check etc. can be selected according to prior art.
In particular it is required that the situation of the CQI information under different condition includes but is not limited to the feelings for having used eICIC technologies
Scape, the terminal for not possessing the ability include but is not limited to the terminal of R8 versions or R9 versions (also referred to herein simply as R8/9).
The different condition includes：
High power node and/or femto almost sub-frame set corresponding to blank subframe (ABS) and high power node and/
Or sub-frame set corresponding to femto normal sub-frames；Or, including：
Sub-frame set corresponding to high power node and/or femto normal sub-frames；High power node and/or femto zero energys
(Zero Power) sub-frame set corresponding to subframe；And high power node and/or femto drop power (Reduted Power)
Sub-frame set corresponding to subframe.
Step 103：CQI corrects step, judges to need the CQI information under different condition and the terminal does not possess on described
During report ability, the CQI measured value amendments that the base station reports according to the terminal obtain the final CQI amendments under different condition
Value；
Specifically, base station can correct to obtain the final CQI correction values under different condition using existing method, preferably
Ground, as shown in Fig. 2 the final CQI correction values that CQI amendments step is obtained under different condition include following sub-step：
Step 201：Sub-step is counted, under the conditions of statistics is each, the UE for reporting CQI measured values in predetermined measurement period is descending
The ACK numbers and NACK numbers of transmission block；
Step 202：Measured value amendment sub-step, before dispatch terminal, according to the ACK numbers and NACK numbers to the end
The CQI measured values reported circulation is held to correct the final correction values of CQI under the conditions of obtaining respectively；
In the measured value amendment sub-step, the CQI measured values are modified according to equation below：
Wherein,Point
The CQI correction values that Wei do not obtain after i+1 time and ith amendment, during i=0,Surveyed for the CQI that the terminal reports
Value, α and-β are modifying factor, can be arranged as required to.Preferably, it is that target misses block to meet α/β=x/ (1-x), wherein x
Rate.
Step 104：Modulation selection step, when dispatching the terminal, the base station is according to the current respective conditions of the terminal
Under final CQI correction values selecting modulation mode, code check.
In the inventive method, base station judges to need CQI information under different condition and terminal does not possess and reports different bars
Under part during the reporting ability of CQI information, channel quality instruction is corrected respectively based on different condition so that revised amendment channel
The channel quality and suitable modulation system and code check that quality instruction can reflect under different condition, so as to improve system throughput
Amount, improve system effectiveness.
Embodiments of the invention are described in detail below in conjunction with accompanying drawing.It should be noted that do not conflicting
In the case of, the feature in embodiment and embodiment in the application can be mutually combined.
Application example 1
The method for the channel quality indication (CQI) information amendment that this example provides is applied to wireless communication system, especially LTE-A
(Long Term Evolution-Advanced, the Long Term Evolution of enhancing) system.It is discussed in detail with reference to specific steps.This
In instance system, the subframe of high power node is divided into almost blank subframe (ABS) and normal sub-frames, and the UE in the present embodiment is
R8/9UE。
Step 301：UE estimates according to the down channel of some subframes, is calculated descending CQI measured values, and by the CQI
Measured value feeds back to base station, channel quality instruction (CQI) measured value that base station receiving terminal reports；
Step 302：Base station judges whether to need CQI information under different condition and whether terminal has and report different bars
The reporting ability of CQI information under part；
In step 302, base station judges UE for R8/9UE, then performs step 303, and the CQI otherwise directly reported according to UE believes
Cease selecting modulation mode and code check.
Step 303：The CQI measured value amendments that base station reports according to the terminal obtain high power node almost blank subframe
(ABS) the final CQI correction values of sub-frame set corresponding to sub-frame set corresponding to and high power node normal sub-frames；
It is specific to perform following operate：
(a) counted；
Set variableFor corresponding to high power node ABS subframes in an ACK/NACK measurement period
Sub-frame set on report CQI measured values UE downstream transmission blocks ACK numbers and NACK numbers；Set variableIt is corresponding for high power node normal sub-frames in an ACK/NACK measurement period (non-ABS subframes)
Sub-frame set on some UE downstream transmission blocks ACK numbers and NACK numbers.
Base station is repeated to the statistics of ACK numbers and NACK numbers in units of ACK/NACK measurement periods.Each
When ACK/NACK measurement periods start, by variable Reset；In each ACK/
In NACK measurement periods, some UE downstream transmission blocks in the sub-frame set corresponding to the statistics high power node ABS subframes of base station
ACK numbersWith NACK numbersCount the subframe collection corresponding to high power node normal sub-frames (non-ABS subframes)
Close the ACK numbers of some UE downstream transmission blocksWith NACK numbers
(b) value amendment is measured according to statistical result；
Before dispatch terminal, base station is repeated to the amendment that channel quality indicates in units of ACK/NACK measurement periods.
Base station at the end of each ACK/NACK measurement periods, according toCorrect corresponding to high power node ABS subframes
Sub-frame set channel quality instruction, obtain before the sub-frame set dispatch terminal corresponding to high power node ABS subframes most
Amendment channel quality information eventuallyAccording toIt is right to correct the non-ABS subframes institute of high power node
The channel quality instruction for the sub-frame set answered, before obtaining the sub-frame set dispatch terminal corresponding to the non-ABS subframes of high power node
Final amendment channel quality information
In step (b),(or) and(or) amendment to channel quality indication (CQI) information
It is to be carried out with reference to respective modifying factor,(or) channel quality indication (CQI) information CQI modifying factors be α,(or) channel quality indication (CQI) information CQI modifying factors be-β, then high power node after UE amendment
Amendment the CQI renewal such as formula of sub-frame set corresponding to ABS subframes：
The amendment CQI renewals of sub-frame set corresponding to UE revised high power node normal sub-frames (non-ABS subframes)
Method is similar, specific as follows：
Wherein, i represents ith amendment, during i=0,The CQI reported for the terminal
Measured value CQImeasured。
α and-β be modifying factor, can flexibly be set according to concrete application environment or experience during specific implementation, it is preferable that walk
Suddenly, will in order to reach target Block Error Rate BLER in (b)(or) and(or) CQI is corrected
Factor setting is related to BLER.Require to be x such as BLER,(or) CQI modifying factors be α,(or) CQI modifying factors be that-β, α and β are positive numbers, and meet α/β=x/ (1-x).
Step 303：Base station is according to revised channel quality informationSelect high power node ABS subframes institute
The modulation system of corresponding sub-frame set, code check etc.；According to revised channel quality informationSelect high power section
Put modulation system, code check of the sub-frame set corresponding to normal sub-frames (non-ABS subframes) etc..
This example after introducing eICIC technologies, refers to suitable for the heterogeneous network of lte-a system to UE down channel qualities
Show the amendment of information.Compared with the conventional method, CQI information after this example can be corrected preferably, more can effectively indicate
The down channel quality of subframe corresponding to high power node ABS subframes and normal sub-frames (non-ABS subframes), therefore, Ke Yifen
The other subframe to corresponding to high power node ABS subframes and normal sub-frames (non-ABS subframes) selects different modulation systems, code check
Deng improving the handling capacity and efficiency of system.
Application example 2
The method for the channel quality indication (CQI) information amendment that this application example provides is applied to wireless communication system, especially
LTE-A (Long Term Evolution-Advanced, the Long Term Evolution of enhancing) system.It is situated between in detail with reference to instantiation
Continue.In this instance system, the subframe of high power node is divided into Zero Power (zero energy) subframe, Reduced Power (drop work(
Rate) subframe and normal sub-frames, the UE in the present embodiment is R8/9UE.
In the normal sub-frames (non-ABS subframes), Zero Power ABS subframes, Reduced Power of high power node
In ABS subframes, the power of high power node downlink transfer be it is entirely different, therefore, in these three subframes and the scene deposited,
Corresponding to these three subframes in the subframe of low power nodes, the interference for the high power node that the UE of low power nodes is subject to is also
Different, its down channel quality and measurement result are also different, step 301：UE estimates according to the down channel of some subframes, counts
Calculation obtains descending CQI measured values, and the CQI measured values are fed back into base station, the channel quality instruction that base station receiving terminal reports
(CQI) measured value；
Step 302：Base station judges whether to need CQI information under different condition and whether terminal has and report different bars
The reporting ability of CQI information under part；
In step 302, base station judges UE for R8/9UE, then performs step 303, and the CQI otherwise directly reported according to UE believes
Cease selecting modulation mode and code check.
Step 303：The CQI measured value amendments that base station reports according to the terminal obtain high power node Zero Power
Sub-frame set corresponding to (zero energy) subframe, sub-frame set and height corresponding to high power node R educed Power (drop power)
The final CQI correction values of sub-frame set corresponding to power node normal sub-frames；
It is specific to perform following operate：
(a) counted；
Set variableFor high power node normal sub-frames in an ACK/NACK measurement period
The ACK numbers and NACK numbers of some R8/9UE downstream transmission blocks in sub-frame set corresponding to (non-hair ABS subframes)；Setting becomes
AmountFor high power node Zero Power ABS subframes in an ACK/NACK measurement period
The ACK numbers and NACK numbers of some R8/9UE downstream transmission blocks in corresponding sub-frame set；Set variable For high power node R educed Power in an ACK/NACK measurement period
The ACK numbers and NACK numbers of some UE downstream transmission blocks in sub-frame set corresponding to ABS subframes.
Base station is repeated to the statistics of ACK numbers and NACK numbers in units of ACK/NACK measurement periods.Each
When ACK/NACK measurement periods start, by variable
Reset；In each ACK/NACK measurement periods, the son corresponding to the statistics high power node Zero Power ABS subframes of base station
Frame collection closes the ACK numbers of some UE downstream transmission blocksWith NACK numbersCount high power section
The ACK numbers of some UE downstream transmission blocks in sub-frame set corresponding to point Reduced Power ABS subframesWith NACK numbersIt is corresponding to count high power node normal sub-frames (non-ABS subframes)
Sub-frame set on some UE downstream transmission blocks ACK numbersWith NACK numbers
(b) value amendment is measured according to statistical result；
Before dispatch terminal, base station is repeated to the amendment that channel quality indicates in units of ACK/NACK measurement periods.
Base station at the end of each ACK/NACK measurement periods, according to Circulation amendment high power node
The channel quality instruction of sub-frame set corresponding to Zero Power ABS subframes, obtained high power node Zero Power
Final amendment channel quality information before sub-frame set dispatch terminal corresponding to ABS subframesAccording to Correct the subframe collection corresponding to high power node R educed Power ABS subframes
The channel quality instruction of conjunction, the sub-frame set scheduling corresponding to obtained high power node R educed Power ABS subframes is eventually
Final amendment channel quality information before endAccording toCorrect high power node
The channel quality instruction of sub-frame set corresponding to non-ABS subframes, the obtained subframe corresponding to the non-ABS subframes of high power node
Gather the final amendment channel quality information before dispatch terminal
In step (b),(or) and(or
) amendment to channel quality indication (CQI) information carries out with reference to respective modifying factor,(or) channel quality indication (CQI) information CQI modifying factors be α,(or) channel quality indication (CQI) information CQI modifying factors be-β, then Gao Gong after UE amendment
Amendment the CQI renewal such as formula of sub-frame set corresponding to rate node Zero Power ABS subframes：
It is sub corresponding to UE revised high power node R educed Power ABS and normal sub-frames (non-ABS subframes)
The amendment CQI update methods of frame set are similar, specific as follows：
Wherein, i represents ith amendment, during i=0,
The CQI measured values CQI reported for the terminalmeasured。
α and-β be modifying factor, can flexibly be set according to concrete application environment or experience during specific implementation, it is preferable that walk
Suddenly, will in order to reach target Block Error Rate BLER in (b)(or) and(or) difference is set as to CQI modifying factors.Require to be x such as BLER,
(or) CQI modifying factors be α,(or)
CQI modifying factors be that-β, α and β are positive numbers, and meet α/β=x/ (1-x).
Step 303：Base station is according to revised channel quality informationSelect high power node Zero
The modulation system of sub-frame set corresponding to Power ABS subframes, code check etc.；According to revised channel quality informationThe modulation system of sub-frame set corresponding to selection high power node R educed Power ABS subframes,
Code check etc.；According to revised channel quality informationSelect high power node normal sub-frames (non-ABS subframes) institute right
The modulation system of the sub-frame set answered, code check etc..
This example is suitable for the heterogeneous network of lte-a system, after introducing eICIC technologies, high power node Zero ABS
Under subframe, Reduce Power ABS subframes and normal sub-frames (non-ABS subframes) and the scene deposited, UE down channel qualities are referred to
Show the amendment of information.Compared with the conventional method, CQI information after this example can be corrected preferably, more can effectively indicate
Subframe corresponding to high power node Zero ABS subframes, Reduce Power ABS subframes and normal sub-frames (non-ABS subframes)
Down channel quality, therefore, can be respectively to high power node Zero ABS subframes, Reduce Power ABS subframes and just
Subframe corresponding to normal subframe (non-ABS subframes) selects different modulation systems, code check etc., improves the handling capacity and effect of system
Rate.
Application example 3
The method for the channel quality indication (CQI) information amendment that this application example provides is applied to wireless communication system, especially
LTE-A (Long Term Evolution-Advanced, the Long Term Evolution of enhancing) system.It is situated between in detail with reference to instantiation
Continue.In this instance system, Femto (Home eNodeB) subframe is divided into almost blank subframe (ABS) and normal sub-frames, the present embodiment
In UE be R8/9UE.
In heterogeneous network, if low power nodes are CSG (Closed Subscribed Group, closed users
Group) Femto (Home eNodeB), then unauthorized in Femto coverage allows the UE for accessing Femto to connect
Enter Femto, only have access other nodes (typically accessing the high power node extensively covered), now, these UE are by Femto
Strong jamming, it is difficult to normally receive the signal of its access node.It is such to solve the problems, such as that R10 standards are also introduced into eICIC technologies,
By setting Femto ABS subframes (the almost subframe of blank, Almost Blank Subframe) so that cover model in Femto
The UE of other nodes in enclosing can carry out data receiver, accurate measurement etc. in subframe corresponding to Femto ABS subframes.
, it is clear that in normal sub-frames (non-ABS subframes), ABS subframes in Femto, the power of Femto downlink transfers is entirely different
, therefore, corresponding to different subframes in the subframe of other nodes, the UE of other nodes in Femto coverages by
The Femto arrived interference is also different, and its down channel quality and measurement result are also different, step 301：UE is according to some sons
The down channel estimation of frame, is calculated descending CQI measured values, and the CQI measured values are fed back into base station, base station receiving terminal
Channel quality instruction (CQI) measured value reported；
Step 302：Base station judges whether to need CQI information under different condition and whether terminal has and report different bars
The reporting ability of CQI information under part；
In step 302, base station judges UE for R8/9UE, then performs step 303, and the CQI otherwise directly reported according to UE believes
Cease selecting modulation mode and code check.
Step 303：Base station is according to corresponding to the CQI measured value amendments that the terminal reports obtain Femto ABS subframes
The final CQI correction values of other node sub-frame sets corresponding to other node sub-frame sets and Femto normal sub-frames；
It is specific to perform following operate：
(a) counted；
Set variableFor its corresponding to Femto ABS subframes in an ACK/NACK measurement period
Positioned at the ACK numbers and NACK numbers of the UE downstream transmission blocks of some in Femto coverages in his node sub-frame set；Setting
VariableFor corresponding to Femto normal sub-frames in an ACK/NACK measurement period (non-ABS subframes)
Positioned at the ACK numbers and NACK numbers of some UE downstream transmission blocks in Femto coverages in other node sub-frame sets.
Base station is repeated to the statistics of ACK numbers and NACK numbers in units of ACK/NACK measurement periods.Each
When ACK/NACK measurement periods start, by variable Reset；In each ACK/
In NACK measurement periods, some UE downlink transfer in other node sub-frame sets corresponding to the statistics Femto ABS subframes of base station
The ACK numbers of blockWith NACK numbersCount other nodes corresponding to Femto normal sub-frames (non-ABS subframes)
The ACK numbers of some UE downstream transmission blocks in sub-frame setWith NACK numbers
(b) value amendment is measured according to statistical result；
Before dispatch terminal, base station to amendment channel quality instruction amendment repeated in units of ACK/NACK measurement periods into
OK.Base station at the end of each ACK/NACK measurement periods, according toCirculation amendment Femto ABS subframes institute
The channel quality instruction of other corresponding node sub-frame sets, obtained other node subframes corresponding to Femto ABS subframes
Gather the final amendment channel quality information before dispatch terminalAccording toCirculation amendment
The channel quality instruction of other node sub-frame sets corresponding to the non-ABS subframes of Femto, the obtained non-ABS subframes institutes of Femto are right
Final amendment channel quality information before other node sub-frame set dispatch terminals answered
In step (b),(or) and(or) amendment to channel quality indication (CQI) information
It is to be carried out with reference to respective modifying factor,(or) channel quality indication (CQI) information CQI modifying factors be α,(or) channel quality indication (CQI) information CQI modifying factors be-β, then Femto ABS after UE amendment
Amendment the CQI renewal such as formula of the sub-frame set of other nodes corresponding to frame：
The amendment CQI of the sub-frame set of other nodes corresponding to UE revised Femto normal sub-frames (non-ABS subframes)
Update method is similar, specific as follows：
Wherein, i represents ith amendment, during i=0,The CQI reported for the terminal
Measured value CQImeasured。
α and-β be modifying factor, can flexibly be set according to concrete application environment or experience during specific implementation, it is preferable that walk
Suddenly, will in order to reach target Block Error Rate BLER in (b)(or) and(or) CQI is corrected
The factor is set as difference.Require to be x such as BLER,(or) CQI modifying factors be α,(or) CQI modifying factors be that-β, α and β are positive numbers, and meet α/β=x/ (1-x).
Step 303：Base station is according to revised channel quality informationSelect corresponding to Femto ABS subframes
The modulation systems of other node sub-frame sets, code check etc.；According to revised channel quality informationSelection
The modulation systems of other node sub-frame sets corresponding to Femto normal sub-frames (non-ABS subframes), code check etc..
For this example suitable for the heterogeneous network of lte-a system, low power nodes are CSG (Closed Subscribed
Group, closed user's group) Femto when, unauthorized in Femto coverage allows the UE for accessing Femto drawing
After entering eICIC technologies, the amendment to UE down channel quality configured informations.Compared with the conventional method, this example can obtain more
CQI information after good amendment, it more can effectively indicate Femto ABS subframes and its corresponding to normal sub-frames (non-ABS subframes)
The down channel quality of his node subframe, therefore, it can allow to access Femto for unauthorized in Femto coverage
UE selects other node subframes corresponding to Femto ABS subframes and normal sub-frames (non-ABS subframes) different modulation respectively
Mode, code check etc., improve the handling capacity and efficiency of system.
In order to realize preceding method, present invention also offers a kind of base station, as shown in figure 3, the base station includes：
CQI receiving modules, (CQI) measured value is indicated for the channel quality that receiving terminal reports；
Ability judge module, for judging whether to need whether CQI information under different condition and the terminal have
Report the reporting ability of CQI information under different condition；
CQI correcting modules, do not possess described report for the CQI information under needing different condition in judgement and the terminal
During ability, the CQI measured value amendments reported according to the terminal obtain the final CQI correction values under different condition；
Selecting module is modulated, when dispatching the terminal, for being repaiied according to the final CQI under the current respective conditions of the terminal
On the occasion of selecting modulation mode, code check.
Specifically, the terminal for not possessing the ability is the terminal of R8 versions or R9 versions.
Further, the different condition includes：
High power node and/or femto almost sub-frame set corresponding to blank subframe (ABS) and normal in high power node
Sub-frame set corresponding to subframe；Or, including：
Sub-frame set corresponding to high power node and/or femto normal sub-frames；High power node and/or femto zero energys
(Zero Power) sub-frame set corresponding to subframe；And high power node and/or femto drop power (Reduced Power)
Sub-frame set corresponding to subframe.
Preferably, as shown in figure 4, the CQI correcting modules include：
Statistic submodule, under the conditions of statistics is each, UE downstream transmission blocks for reporting CQI measured values in predetermined measurement period
ACK numbers and NACK numbers；
Measured value amendment submodule, before dispatching the terminal, according to the ACK numbers and NACK numbers counted under the conditions of each
The CQI measured values circulation amendment that mesh reports to the terminal obtains the final correction values of CQI under the conditions of this.
The measured value amendment submodule is modified according to equation below to the CQI measured values：
Wherein,Point
The CQI correction values that Wei do not obtain after i+1 time and ith amendment, during i=0,Surveyed for the CQI that the terminal reports
Value, α and-β are modifying factor, and meet that α/β=x/ (1-x), wherein x are target Block Error Rate.
The inventive method and base station, correct channel quality instruction respectively based on different condition, realize revised amendment letter
The channel quality that road quality instruction can reflect under different condition, compared with prior art, method used in the present invention causes
Revised channel quality instruction can correspond to suitable modulation system and code check under different condition, so as to improve system throughput
Amount, improve system effectiveness.
One of ordinary skill in the art will appreciate that all or part of step in the above method can be instructed by program
Related hardware is completed, and described program can be stored in computer-readable recording medium, such as read-only storage, disk or CD
Deng.Alternatively, all or part of step of above-described embodiment can also be realized using one or more integrated circuits.Accordingly
Ground, each module in above-described embodiment can be realized in the form of hardware, and the form of software function module can also be used real
It is existing.The present invention is not restricted to the combination of the hardware and software of any particular form.
Claims (6)
- A kind of 1. method based on channel quality instruction selecting modulation mode, code check, it is characterised in that this method includes：CQI receiving steps, the channel quality indicator (CQI) measured value that base station receiving terminal reports；Ability judgment step, base station judges whether to need CQI information under different condition and whether the terminal has and report The reporting ability of CQI information under different condition；CQI corrects step, judges to need CQI information under different condition and when the terminal does not possess the reporting ability, institute State the CQI measured value amendments that base station reports according to the terminal and obtain the final CQI correction values under different condition；Modulation selection step, when dispatching the terminal, the base station is repaiied according to the final CQI under the current respective conditions of the terminal On the occasion of selecting modulation mode, code check；The final CQI correction values that the CQI amendments step is obtained under different condition include following sub-step：Sub-step is counted, under the conditions of statistics is each, the ACK of the UE downstream transmission blocks for reporting CQI measured values in predetermined measurement period Number and NACK numbers；Measured value amendment sub-step, before dispatching the terminal, the terminal is reported according to the ACK numbers and NACK numbers The final correction values of CQI under the conditions of obtaining respectively are corrected in the circulation of CQI measured values；Wherein, in the measured value amendment sub-step, the CQI measured values are modified according to equation below：Wherein,Point The CQI correction values that Wei do not obtain after i+1 time and ith amendment, during i=0,The CQI reported for the terminal Measured value, α and-β are modifying factor, and meet that α/β=x/ (1-x), wherein x are target Block Error Rate；Wherein, NACKFor ACK numbers, NNACKFor NACK numbers.
- 2. the method as described in claim 1, it is characterised in that：The terminal for not possessing the reporting ability is R8 versions or R9 versions This terminal.
- 3. the method as described in claim 1, it is characterised in that：The different condition includes：High power node and/or femto almost sub-frame set corresponding to blank subframe ABS and in high power node and/or femto Sub-frame set corresponding to the non-ABS subframes of normal sub-frames；Or, including：Sub-frame set corresponding to high power node and/or the non-ABS subframes of femto normal sub-frames；High power node and/or femto Sub-frame set corresponding to zero energy Zero Power subframes；And high power node and/or femto drop power Reduced Sub-frame set corresponding to Power subframes.
- 4. a kind of base station, it is characterised in that the base station includes：CQI receiving modules, the channel quality indicator (CQI) measured value reported for receiving terminal；Ability judge module, for judging whether to need CQI information under different condition and whether the terminal has and report The reporting ability of CQI information under different condition；CQI correcting modules, do not possess the reporting ability for the CQI information under needing different condition in judgement and the terminal When, the CQI measured value amendments reported according to the terminal obtain the final CQI correction values under different condition；Selecting module is modulated, when dispatching the terminal, for according to the final CQI correction values under the current respective conditions of the terminal Selecting modulation mode, code check；The CQI correcting modules include：Statistic submodule, under the conditions of statistics is each, the ACK of the UE downstream transmission blocks for reporting CQI measured values in predetermined measurement period Number and NACK numbers；Measured value amendment submodule, before dispatching the terminal, according to the ACK numbers and NACK numbers pair counted under the conditions of each The CQI measured values circulation amendment that the terminal reports obtains the final correction values of CQI under the conditions of this；The measured value amendment submodule is modified according to equation below to the CQI measured values：Wherein,Point The CQI correction values that Wei do not obtain after i+1 time and ith amendment, during i=0,The CQI reported for the terminal Measured value, α and-β are modifying factor, and meet that α/β=x/ (1-x), wherein x are target Block Error Rate；Wherein, NACKFor ACK numbers, NNACKFor NACK numbers.
- 5. base station as claimed in claim 4, it is characterised in that：The terminal for not possessing the ability is R8 versions or R9 versions Terminal.
- 6. base station as claimed in claim 4, it is characterised in that：The different condition includes：High power node and/or femto almost sub-frame set corresponding to blank subframe ABS and in high power node and/or femto Sub-frame set corresponding to the non-ABS subframes of normal sub-frames；Or, including：Sub-frame set corresponding to high power node and/or the non-ABS subframes of femto normal sub-frames；High power node and/or femto Sub-frame set corresponding to zero energy Zero Power subframes；And high power node and/or femto drop power Reduced Sub-frame set corresponding to Power subframes.
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| CN103987089B (en) * | 2014-05-09 | 2018-01-05 | 东南大学 | The channel quality index uploading method of ABS mechanism is not lined up |
| US10079655B2 (en) * | 2015-01-30 | 2018-09-18 | Telefonaktiebolaget Lm Ericsson (Publ) | Radio node, wireless device and methods therein, for configuring a plurality of channel quality information values |
| WO2016172897A1 (en) * | 2015-04-30 | 2016-11-03 | 华为技术有限公司 | Channel quality indication adjustment method and device |
| CN109478963B (en) * | 2016-11-18 | 2021-02-09 | 华为技术有限公司 | Data transmission method and device |
| CN108347266B (en) * | 2017-01-24 | 2020-12-25 | 瑞昱半导体股份有限公司 | Receiving device and receiving method for determining modulation coding mode based on channel capacity |
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