CN103259611B - The method and system that modulation coding mode adaptively adjusts - Google Patents

The method and system that modulation coding mode adaptively adjusts Download PDF

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CN103259611B
CN103259611B CN201210036682.2A CN201210036682A CN103259611B CN 103259611 B CN103259611 B CN 103259611B CN 201210036682 A CN201210036682 A CN 201210036682A CN 103259611 B CN103259611 B CN 103259611B
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梁西安
王衍文
刘文豪
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ZTE Corp
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Abstract

The invention discloses the method and system that a kind of modulation coding mode adaptively adjusts, UE feeds back the CQI results under CoMP patterns and non-CoMP patterns respectively when to base station feedback CQI results；Base station judges whether to CoMP patterns, and selects the CQI results under corresponding modes to carry out MCS mappings according to judged result.The present invention proposes a kind of CQI feedback pattern suitable for CoMP CB scenes, and UE fully takes into account the otherness for calculating interference under CoMP and non-CoMP patterns between base station when feeding back CQI, so that base station can select suitable MCS value.

Description

The method and system that modulation coding mode adaptively adjusts
Technical field
The present invention relates to wireless communication field, a kind of method adaptively adjusted in particular to modulation coding mode And system.
Background technology
In a wireless communication system, handling capacity is to weigh base station, cell and UE (User Equipment, user terminal) in fact One important indicator of border business transmittability.And MCS (Modulation and Coding Scheme, modulation coding mode) It is two key factors of influence throughput hoisting with BLER (Block Error Ratio, the bit error rate).
In CoMP (Coordinative Multiple Point, cooperateing with multiple spot) CB (Coordinated Beamforming, cooperative beam figuration) under pattern (hereinafter referred to as CoMP patterns), the cell in cooperation set need according to from The situation of body signal and interference signal, from effect of the appropriate pre-coding matrix to reach Inter-Cell Interference Coordination or evade, So as to improve the handling capacity of cell edge, the average throughput of cell is improved.
Under normal circumstances, the general process of MCS adjustment is：UE uplink feedbacks CQI (Channel Quality Indicator, channel quality instruction) result and ACK/NACK (Acknowledgement/Negative Acknowledgement, positive acknowledgment/NACK) result, base station determines MCS a reference values according to CQI results, and according to cunning BLER corresponding to the determination of ACK/NACK results, then determines MCS amount trimmeds according to BLER size, finally integrates MCS in window A reference value and MCS amount trimmeds obtain finally dispatching the MCS value used.
There are the following problems or deficiency for the general process of above-mentioned MCS adjustment：
1) CQI calculating is completed in UE sides, and actually UE is not aware that precoding square used in interfered cell Battle array.Under CoMP patterns, base station is in order to eliminate interference, and generally according to PMI, (Precoding Matrix Indicator, prelist The instruction of code matrix) and prelisting of being actually used of WCI (Worst CompanionIndicator, worst with indicate) information Code matrix；Under non-CoMP patterns, base station does not consider WCI information typically；Whether UE does not know next moment base station yet simultaneously Carry out CoMP cooperations.
2) it is by NACK number of feedback divided by cunning when the ACK/NACK results that base station is fed back according to UE at present calculate BLER Window length obtains, and this is substantially to employ identical weight coefficient, without the ACK/ in view of diverse location in sliding window NACK results have different influences to what this MCS was adjusted.
Therefore, based on the above, it is necessary to propose a kind of adaptive Adjusted Options of new MCS for CoMP CB scenes.
The content of the invention
Present invention solves the technical problem that it is to provide the method and system that a kind of modulation coding mode adaptively adjusts, Under CoMP CB scenes, UE enables base station to select suitable MCS to the CQI results under base station feedback CoMP and non-CoMP patterns Value.
In order to solve the above technical problems, the method that adaptively adjusts of coded system is adjusted the invention provides a kind of,
For user equipment (UE) when indicating (CQI) result to base station feedback channel quality, feedback cooperates with multiple spot respectively (CoMP) the CQI results under pattern and non-CoMP patterns；
The base station judges whether to CoMP patterns, and selects the CQI results under corresponding modes to enter according to judged result Row adjustment coded system (MCS) mapping.
Further, the UE obtains the CQI results under the CoMP patterns and non-CoMP patterns in the following manner：
Under CoMP patterns, the UE assumes that the precoding that serving cell uses is corresponding for pre-coding matrix instruction (PMI) Four antenna codebooks, it is assumed that the precoding that interfered cell uses be with it is worst with instruction (WCI) orthogonal 1 layer and 2 layers four days Line code sheet, and draw by the way of statistical average the average statistical of the SINR under CoMP patterns；
Under non-CoMP patterns, the UE assumes that the precoding that serving cell uses is four antenna codebooks corresponding to PMI, false It is four antenna codebooks corresponding to interference channel order instruction (RI) to determine the precoding that interfered cell uses, and traversal RI corresponds to the four of the number of plies Antenna codebook, and draw by the way of statistical average the average statistical of the SINR under non-CoMP patterns；
Under average statisticals and the non-CoMP patterns of the UE according to the SINR under the obtained CoMP patterns SINR average statistical, SINR to the CQI of downlink mapping table is searched, respectively obtained under CoMP patterns and non-CoMP patterns CQI results.
Further, the base station judges whether to CoMP patterns in such a way：
The base station obtains the kernel that WCI corresponds to code book according to the UE WCI fed back and PMIAnd calculate PMI and arrive KernelDistance D, when the distance D is less than or equal to predetermined threshold value, judge carry out CoMP patterns, as the distance D During more than the predetermined threshold value, judge to carry out non-CoMP patterns.
Further, the CQI results under the base station selected corresponding modes carry out MCS mappings, refer to：
The CQI results under the CoMP patterns of the UE feedbacks are selected under CoMP patterns, and the CQI for searching downlink is arrived MCS mapping table obtains MCS a reference values；
The CQI results under the non-CoMP patterns of the UE feedbacks are selected under non-CoMP patterns, and search downlink CQI to MCS mapping table obtains MCS a reference values.
Further, methods described also includes：
Positive acknowledgment/NACK (ACK/NACK) result that the base station is fed back according to the UE, is determined in sliding window not Enter with the weight coefficient corresponding to ACK/NACK results position, and by the weight coefficient corresponding to NACK results all in sliding window Row is added summation, and the bit error rate (BLER) in sliding window is calculated.
Further, the base station determines the weight coefficient corresponding to ACK/NACK results position in sliding window according to the following formula α1, α2..., αL：
Wherein, L be sliding window length, αLTo adjust nearest ACK/NACK results apart from this MCS；
And the base station calculates BLER according to the following formula：
BLER=(α1+α2+…+αLNack) × 100%,
Wherein, LNack is the total number of NACK results in sliding window.
Further, methods described also includes：
The base station according to the BLER being calculated, obtain according to the following formula the continuous good number BLERGoodNum of BLER and The continuous poor number BLERBadNum of BLER：
Wherein, for GoodVal to judge the preferable BLER threshold values of communication quality, BadVal is to judge that communication quality is poor BLER threshold values；
And MCS amount trimmed Δs MCS is determined according to the following formula：
Wherein, GoodCnt is the BLERGoodNum threshold values that Δ MCS increases 1 grade, and BadCnt is that Δ MCS reduces 1 The BLERBadNum threshold values of individual grade.
Present invention also offers a kind of system for adjusting coded system and adaptively adjusting, the system is included in user equipment CQI feedback module, and MCS mapping blocks in base station,
The CQI feedback module is used for, and when to base station feedback CQI results, feeds back CoMP patterns and non-CoMP moulds respectively CQI results under formula；
The MCS mapping blocks are used for, and receive the CQI results under the CoMP patterns and non-CoMP patterns of UE feedbacks；Judge CoMP patterns whether are carried out, and select the CQI results under corresponding modes to carry out MCS mappings according to judged result.
Further, the CQI feedback module obtains the CQI knots under CoMP patterns and non-CoMP patterns in the following manner Fruit：
Under CoMP patterns, it is assumed that the precoding that serving cell uses is four antenna codebooks corresponding to PMI, it is assumed that interference is small The precoding that area uses is 1 floor orthogonal with WCI and the antenna codebook of 2 floor four, and CoMP moulds are drawn by the way of statistical average The average statistical of SINR under formula；
Under non-CoMP patterns, the UE assumes that the precoding that serving cell uses is four antenna codebooks corresponding to PMI, false It is four antenna codebooks corresponding to interference channel RI to determine the precoding that interfered cell uses, and traversal RI corresponds to four antenna codes of the number of plies Originally, and by the way of statistical average draw the average statistical of the SINR under non-CoMP patterns；
According to the system of the SINR under the average statistical of the SINR under the obtained CoMP patterns and the non-CoMP patterns Average is counted, searches SINR to the CQI of downlink mapping table, respectively obtains the CQI knots under CoMP patterns and non-CoMP patterns Fruit.
Further, the MCS mapping blocks are used for, and judge whether to CoMP patterns in such a way：
The WCI and PMI fed back according to the UE, obtains the kernel that WCI corresponds to code bookAnd PMI is calculated to kernel Distance D, when the distance D is less than or equal to predetermined threshold value, judge carry out CoMP patterns, when the distance D is more than institute When stating predetermined threshold value, judge to carry out non-CoMP patterns.
Further, the MCS mapping blocks are used for, under the CoMP patterns that the UE feedbacks are selected under CoMP patterns CQI results, and the mapping table for searching CQI to the MCS of downlink obtains MCS a reference values；
The CQI results under the non-CoMP patterns of the UE feedbacks are selected under non-CoMP patterns, and search downlink CQI to MCS mapping table obtains MCS a reference values.
Further, the system also includes MCS adjusting modules,
The MCS adjusting modules are used for, the ACK/NACK results fed back according to UE, determine different ACK/NACK knots in sliding window Weight coefficient corresponding to fruit position, and the weight coefficient corresponding to NACK results all in sliding window is subjected to addition summation, The BLER in sliding window is calculated, and MCS amount trimmed Δ MCS are determined according to the BLER being calculated, using the Δ MCS to institute State MCS a reference values to be adjusted, the MCS finally used.
Further, the MCS adjusting modules are used for, and determine according to the following formula in sliding window corresponding to ACK/NACK results position Weight coefficient α1, α2..., αL：
Wherein, L be sliding window length, αLTo adjust nearest ACK/NACK results apart from this MCS；
And the base station calculates BLER according to the following formula：
BLER=(α1+α2+…+αLNack) × 100%, wherein, LNack is the total number of NACK results in sliding window.
Further, the MCS adjusting modules are used for, and according to the BLER being calculated, it is continuous to obtain BLER according to the following formula The continuous poor number BLERRadNum of good number BLERGoodNum and BLER：
Wherein, for GoodVal to judge the preferable BLER threshold values of communication quality, BadVal is to judge that communication quality is poor BLER threshold values；
And MCS amount trimmed Δs MCS is determined according to the following formula：
Wherein, GoodCnt is the BLERGoodNum threshold values that Δ MCS increases 1 grade, and BadCnt is that Δ MCS reduces 1 The BLERBadNum threshold values of individual grade.
In summary, the present invention proposes a kind of CQI feedback pattern suitable for CoMP CB scenes, and UE fills when feeding back CQI Divide the otherness in view of calculating interference between base station under CoMP and non-CoMP patterns, so that base station can select suitable MCS value； Further it is proposed that a kind of mode of new weighting calculates BLER, according to different ACK/NACK results using different Weighted value, so as to consider the accumulative influence to this subframe of ACK/NACK history relatively reasonablely.
Compared with prior art, at least had the advantages that using the present invention program：
(1) be advantageous to effective transmission of business datum, reduce the number of retransmissions of business datum；
(2) be advantageous to improve the availability of frequency spectrum of cell；
(3) be advantageous to be lifted the handling capacity of terminal and cell.
Brief description of the drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the part of the application, this hair Bright schematic description and description is used to explain the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the physical channel schematic diagram of base station and terminal under CoMP CB scenes；
Fig. 2 is the MCS self-adapting regulation method schematic flow sheets of the embodiment of the present invention.
Embodiment
Present embodiment provides a kind of method that MCS is adaptively adjusted under CoMP CB patterns, and it uses following scheme：
UE feeds back CoMP patterns and the CQI results under non-CoMP patterns respectively when to base station feedback CQI results.
Base station receives the CoMP patterns of UE feedbacks and the CQI results under non-CoMP patterns, judges whether to CoMP patterns, And selected the CQI results under corresponding modes to carry out MCS mappings according to judged result, i.e.,：CoMP patterns are selected under CoMP patterns Under CQI results carry out MCS mappings, select CQI results under non-CoMP patterns to carry out MCS mappings under non-CoMP patterns.
Further, UE obtains the CQI results under CoMP patterns and non-CoMP patterns in the following manner：
Under CoMP patterns, UE assumes that the precoding that uses of serving cell is four antenna codebooks corresponding to PMI, although UE without Method knows the precoding that interfered cell uses, but the principle of interference can be eliminated based on CoMP patterns, therefore UE assumes interfered cell Using 1 layer orthogonal with WCI and 2 layer of four antenna codebook, while reduce error by the way of statistical average, so as to obtain CoMP SINR average statistical under pattern.
Under non-CoMP patterns, UE assumes that the precoding that serving cell uses is four antenna codebooks corresponding to PMI, due to non- Minizone does not carry out interference elimination under CoMP patterns, while UE can not know the precoding that interfered cell uses again, therefore UE is false It is four antenna codebooks corresponding to interference channel RI to determine the precoding that interfered cell uses, and in order to reduce error, UE is using traversal RI Four antenna codebooks of the corresponding number of plies, so as to obtain the average statistical of SINR under non-CoMP patterns.
For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with accompanying drawing to the present invention Embodiment be described in detail.It should be noted that in the case where not conflicting, in the embodiment and embodiment in the application Feature can mutually be combined.
With reference to shown in Fig. 1, the method that the MCS of the embodiment of the present invention is adaptively adjusted mainly comprises the following steps：
Step 101, initiation parameter.After terminal is successfully accessed to base station, initialization MCS amount trimmeds (Δ MCS), it is used for Represent the continuous good counting variables (BLERGoodNum) of BLER and for representing the continuous poor counting variables of BLER (BLERBadNum)。
Step 102, UE calculates SINR, and to base station feedback ACK/NACK results and CoMP patterns with non-CoMP patterns CQI results.
Because under CoMP CB patterns, base station obtains precoding square according to the UE PMI fed back and WCI according to certain principle Battle array, therefore UE can not know the pre-coding matrix that serving BS and interference base station use；Simultaneously as UE can not also know it is next Whether CoMP cooperation is carried out between moment base station, thus the UE current times SINR that estimates and CQI is difficult the shape for being applicable subsequent time Condition.
Based on such a situation, the present invention proposes a kind of new CQI feedback pattern, i.e. UE feeds back 2 CQI results simultaneously, point CQI results under CQI results and non-CoMP patterns that Wei be under CoMP patterns；Then base station is entered according to whether carrying out CoMP patterns Row is accepted or rejected, i.e.,：When base station determines to carry out CoMP cooperations, base station can select the CQI results of CoMP patterns to carry out MCS mappings； When base station decides not to perform CoMP cooperations, base station can select the CQI results of non-CoMP patterns to carry out MCS mappings.It is this new The advantages of feedback model, is that base station can select appropriate CQI results according to the situation of actual CoMP patterns.
Wherein, by taking 2 cells as an example, the calculating process that UE feeds back CQI under CoMP and non-CoMP patterns is described in detail below (below without specified otherwise, by taking 2 cells as an example)：
First, 1 SINR is obtained according to the following equation：
Wherein, SINRiRepresent i-th layer of SINR result, f1iRepresent (H11W1) i-th row,Represent f1iConjugate transposition, H11Represent serving cell channel, W1Represent the precoding that serving cell uses；f1kRepresent (H11W1) kth row；Represent f1k's Conjugate transposition；Represent in addition to i-th arranges, (H11W1) remaining each row be multiplied by the result sum of its conjugate transposition respectively, This represents interlayer interference；f2kRepresent (H12W2) kth row,Represent f2kConjugate transposition, H12Represent interference channel, W2Table Show the precoding that interfered cell uses,Represent (H12W2) each row be multiplied by the result sum of its conjugate transposition, this table Show inter-cell interference, RnnRepresent noise, ()-1Represent to matrix inversion.
In the SINR under calculating CoMP patterns, W1Take four antenna codebooks (hereinafter referred to as code book), W corresponding to PMI2Choosing The mode of selecting is：First, according to interference channel H12WCI is obtained, it is complete then to obtain code book corresponding with WCI from 1 layer and 2 layers of code book Orthogonal codebook set R, R is exactly W2Range of choice, it is assumed that have RNum code book in set R, thus can obtain RNum SINR under CoMP patterns, the average value of this RNum SINR result is finally taken as under the CoMP patterns finally used SINR。
Generally for simplify calculate, when WCI be 1 layer of code book, it is only necessary to traversal with WCI with organize 1 layer of code book completely just Friendship group, it is as shown in table 1 below；When WCI is 2 layers of code book, it is necessary to travel through 1 layer and 2 layers of codebook selecting completely orthogonal code book therewith, It is as shown in table 2 below, matrix implication and 3GPP wherein in Tables 1 and 2 (3nd Generation Partnership Project, Third generation partner program) 36.211 agreements are identical.
The complete orthogonal systems of 11 layers of code book of table
The orthogonality relation of table 2 and 2 layers of code book
In the SINR under calculating non-CoMP patterns, W1 takes four antenna codebook corresponding to PMI, and W2 selection mode is：Root Corresponding RI (such as RI=1 or 2) is obtained according to interference channel, then travels through 16 1 layer or 2 layers of four antenna codebooks, thus The SINR under 16 non-CoMP patterns is can obtain, finally takes this 16 SINR average value as the non-CoMP patterns finally used Under SINR.
Then, SINR to the CQI of downlink mapping table is searched, respectively obtains the CQI under CoMP and non-CoMP patterns As a result, then the two CQI results and ACK/NACK results are fed back to base station by UE together.
Step 103, base station determines MCS a reference values MCS_Base according to CQI results；
After base station receives CQI results, CoMP patterns are judged whether to based on certain principle, then CQI corresponding to selection As a result MCS mappings are carried out, i.e., the CQI results of CoMP patterns are selected under CoMP patterns, the CQI for then searching downlink is arrived MCS mapping table obtains MCS a reference values MCS_Base；The CQI results of non-CoMP patterns, Ran Houcha are selected under non-CoMP patterns CQI to the MCS of downlink mapping table is looked for obtain MCS a reference values MCS_Base.
Wherein, after base station receives CQI results, following principle can be used when judging whether to CoMP patterns：First The kernel of code book is corresponded to WCIThen PMI is calculated to kernelDistance D, then distance D is compared with threshold value Compared with when distance D is less than or equal to threshold value, judgement is now appropriate for CoMP patterns, when distance D is more than threshold value, judges Now be not suitable for carrying out CoMP patterns.
Step 104, base station calculates BLER according to ACK/NACK results and determines MCS amount trimmeds.
1) weight coefficient (α according to corresponding to determining ACK/NACK results position in sliding window1, α2..., αL), wherein subscript L Represent the length of sliding window, αLRepresent to adjust nearest ACK/NACK results apart from this MCS.Due to the ACK/NACK of diverse location As a result it is different to the influence degree of this MCS adjustment, so weight coefficient here has following relation：
Wherein, α1, α2..., αLSpecific value can be determined by emulation.
2) weight coefficient corresponding to NACK results all in sliding window is subjected to addition summation, that is, obtains the error code in sliding window Rate BLER：
BLER=(α1+α2+…+αLNack) × 100% (3)
Wherein, subscript LNack represents the total number of NACK results in sliding window.
3) parameter BLERGoodNum is obtained according to BLER results and BLERBadNum, BLERGoodNum represents to judge BLER Continuous good number and BLERBadNum represent to judge the continuous poor numbers of BLER), specific decision method is：
Wherein, GoodVal represents to be determined as the preferable BLER threshold values of communication quality, and BadVal represents to be determined as the matter that communicates Insufferable BLER threshold values are measured, GoodVal and the specific values of BadVal can be determined by system emulation.
4) MCS amount trimmed Δ MCS, tool are updated according to BLERGoodNum the and BLERBadNum values obtained in above-mentioned steps Body mode is as follows：
Wherein, GoodCnt represents that Δ MCS increases the BLERGoodNum threshold values of 1 grade point, and BadCnt represents Δ MCS Reduce the BLERBadNum threshold values of 1 grade.The principle dropped soon is risen slowly because MCS adjustment follows, therefore, under normal circumstances GoodCnt values are more than BadCnt values.For example, work as GoodCnt=5, during BadCnt=2, the implication of expression is：Occur 5 when continuous During secondary preferable BLER, Δ MCS will increase by 1 grade, and when continuously there are 2 poor BLER, Δ MCS will reduce 1 grade.
Step 105, eNB 7 obtains reality according to the following equation according to MCS a reference value MCS_Base and MCS amount trimmed Δ MCS Finally dispatch the MCS value (being represented with variable MCS_Final) used in border：
MCS_Final=MCS_Base+ Δs MCS (7)
It is described further below with reference to the present invention is some using specific implementation of the example to the present invention program.
Using example 1
Present example provides the method that MCS under two base station scenarios is adaptively adjusted, wherein eNB1 represents base station 1, eNB2 Base station 2 is represented, UE1 represents user terminal；ENB1 and eNB2 is respectively provided with 4 transmitting antennas, and UE1 has 2 reception antennas, and ENB1 is UE1 serving cell, and eNB2 is UE1 interfered cell, and H11 is signaling channel, and H12 is interference channel.
The specific implementation process description of this example is as follows：
After UE1 is successfully accessed to eNB1, the adjustment amount Δ MCS=0 of eNB1 initialization bit error rates BLER=0, MCS, count Variable BLERGoodNum=0 and BLERBadNum=0.
UE1 calculates the SINR value under CoMP patterns and non-CoMP patterns using formula 1, and then searches the SINR of downlink To CQI mapping table, the CQI value under the CQI value (being represented with CQI_CoMP) and non-CoMP patterns under CoMP patterns is respectively obtained (being represented with CQI_NoCoMP), and by this 2 CQI values and ACK/NACK results by uplink feedback to eNB1.
ENB1 selects corresponding CQI results according to whether carrying out CoMP patterns, it is assumed that eNB1 judges now to be appropriate for CoMP patterns, then eNB1 can be according to CQI to the MCS of CQI_CoMP result lookup downlink mapping table, so as to obtain MCS A reference value MCS_Base.
ENB1 determines weighting system different corresponding to different ACK/NACK results according to formula 2 according to ACK/NACK results Number α1, α2..., αL；The bit error rate BLER in sliding window is obtained then according to formula 3, then according to formula 4 and the undated parameter of formula 5 BLERGoodNum and BLERBadNum；Finally according to BLERGoodNum and BLERBadNum value, judge to obtain using formula 6 MCS amount trimmed Δs MCS, whole adjustment process embody the principle of " slow to rise fast drop ".
ENB1 is calculated final eNB1 according to formula 7 and adjusted according to MCS a reference value MCS_Base and MCS amount trimmed Δ MCS Spend the MCS value MCS_Final that next subframe uses.
Using example 2
Present example provides the method that MCS under two base station scenarios is adaptively adjusted, wherein eNB1 represents base station 1, eNB2 Base station 2 is represented, UE1 represents user terminal；ENB1 and eNB2 is respectively provided with 4 transmitting antennas, and UE1 has 2 reception antennas, and ENB1 is UE1 serving cell, and eNB2 is UE1 interfered cell, and H11 is signaling channel, and H12 is interference channel.
The specific implementation process description of this example is as follows：
After UE1 is successfully accessed to eNB1, the adjustment amount Δ MCS=0 of eNB1 initialization bit error rates BLER=0, MCS, count Variable BLERGoodNum=0 and BLERBadNum=0.
UE1 calculates the SINR value under CoMP patterns and non-CoMP patterns using formula 1, and then searches the SINR of downlink To CQI mapping table, the CQI value under the CQI value (being represented with CQI_CoMP) and non-CoMP patterns under CoMP patterns is respectively obtained (being represented with CQI_NoCoMP), and by this 2 CQI values and ACK/NACK results by uplink feedback to eNB1.
ENB1 selects corresponding CQI results according to whether carrying out CoMP patterns, it is assumed that eNB1 judges now to be not suitable for carrying out CoMP patterns, then eNB1 can be according to CQI to the MCS of CQI_NoCoMP result lookup downlink mapping table, so as to obtain MCS a reference values MCS_Base.
ENB1 determines weighting system different corresponding to different ACK/NACK results according to formula 2 according to ACK/NACK results Number α1, α2..., αL；The bit error rate BLER in sliding window is obtained then according to formula 3, then according to formula 4 and the undated parameter of formula 5 BLERGoodNum and BLERBadNum；Finally according to BLERGoodNum and BLERBadNum sizes, judge to obtain using formula 6 MCS amount trimmed Δs MCS, whole adjustment process embody the principle of " slow to rise fast drop ".
ENB1 is calculated final eNB1 according to formula 7 and adjusted according to MCS a reference value MCS_Base and MCS amount trimmed Δ MCS Spend the MCS value MCS_Final that next subframe uses.
In addition, a kind of system for adjusting coded system and adaptively adjusting, the system bag are additionally provided in the embodiment of the present invention The CQI feedback module in UE, and the MCS mapping blocks in base station are included, wherein：
The CQI feedback module is used for, and when to base station feedback CQI results, feeds back CoMP patterns and non-CoMP moulds respectively CQI results under formula；
The MCS mapping blocks are used for, and receive the CQI results under the CoMP patterns and non-CoMP patterns of UE feedbacks；Judge CoMP patterns whether are carried out, and select the CQI results under corresponding modes to carry out MCS mappings according to judged result.
Further, the CQI feedback module obtains the CQI knots under CoMP patterns and non-CoMP patterns in the following manner Fruit：
Under CoMP patterns, it is assumed that the precoding that serving cell uses is four antenna codebooks corresponding to PMI, it is assumed that interference is small The precoding that area uses is 1 floor orthogonal with WCI and the antenna codebook of 2 floor four, and CoMP moulds are drawn by the way of statistical average The average statistical of SINR under formula；
Under non-CoMP patterns, the UE assumes that the precoding that serving cell uses is four antenna codebooks corresponding to PMI, false It is four antenna codebooks corresponding to interference channel RI to determine the precoding that interfered cell uses, and traversal RI corresponds to four antenna codes of the number of plies Originally, and by the way of statistical average draw the average statistical of the SINR under non-CoMP patterns；
According to the system of the SINR under the average statistical of the SINR under the obtained CoMP patterns and the non-CoMP patterns Average is counted, searches SINR to the CQI of downlink mapping table, respectively obtains the CQI knots under CoMP patterns and non-CoMP patterns Fruit.
Further, the MCS mapping blocks are used for, and judge whether to CoMP patterns in such a way：
The WCI and PMI fed back according to the UE, obtains the kernel that WCI corresponds to code bookAnd PMI is calculated to kernel Distance D, when the distance D is less than or equal to predetermined threshold value, judge carry out CoMP patterns, when the distance D is more than institute When stating predetermined threshold value, judge to carry out non-CoMP patterns.
Further, the MCS mapping blocks are used for, under the CoMP patterns that the UE feedbacks are selected under CoMP patterns CQI results, and the mapping table for searching CQI to the MCS of downlink obtains MCS a reference values；
The CQI results under the non-CoMP patterns of the UE feedbacks are selected under non-CoMP patterns, and search downlink CQI to MCS mapping table obtains MCS a reference values.
Further, the system also includes MCS adjusting modules,
The MCS adjusting modules are used for, the ACK/NACK results fed back according to UE, determine different ACK/NACK knots in sliding window Weight coefficient corresponding to fruit position, and the weight coefficient corresponding to NACK results all in sliding window is subjected to addition summation, The BLER in sliding window is calculated, and MCS amount trimmed Δ MCS are determined according to the BLER being calculated, using the Δ MCS to institute State MCS a reference values to be adjusted, the MCS finally used.
Further, the MCS adjusting modules are used for, and determine according to the following formula in sliding window corresponding to ACK/NACK results position Weight coefficient α1, α2..., αL：
Wherein, L be sliding window length, αLTo adjust nearest ACK/NACK results apart from this MCS；
And the base station calculates BLER according to the following formula：
BLER=(α1+α2+…+αLNack) × 100%, wherein, LNack is the total number of NACK results in sliding window.
Further, the MCS adjusting modules are used for, and according to the BLER being calculated, it is continuous to obtain BLER according to the following formula The continuous poor number BLERBadNum of good number BLERGoodNum and BLER：
Wherein, for GoodVal to judge the preferable BLER threshold values of communication quality, BadVal is to judge that communication quality is poor BLER threshold values；
And MCS amount trimmed Δs MCS is determined according to the following formula：
Wherein, GoodCnt is the BLERGoodNum threshold values that Δ MCS increases 1 grade, and BadCnt is that Δ MCS reduces 1 The BLERBadNum threshold values of individual grade.
It these are only that the present invention's is preferable to carry out case, be not intended to limit the invention, the present invention can also have other Various embodiments, in the case of without departing substantially from spirit of the invention and its essence, those skilled in the art can be according to this hair It is bright to make various corresponding changes and deformation, but these corresponding changes and deformation should all belong to appended claims of the invention Protection domain.
Obviously, those skilled in the art should be understood that above-mentioned each module of the invention or each step can be with general Computing device realize that they can be concentrated on single computing device, or be distributed in multiple computing devices and formed Network on, alternatively, they can be realized with the program code that computing device can perform, it is thus possible to they are stored Performed in the storage device by computing device, and in some cases, can be with different from shown in order execution herein The step of going out or describing, they are either fabricated to each integrated circuit modules respectively or by multiple modules in them or Step is fabricated to single integrated circuit module to realize.So, the present invention is not restricted to any specific hardware and software combination.

Claims (12)

  1. A kind of 1. method for adjusting coded system and adaptively adjusting, it is characterised in that
    For user equipment (UE) when indicating (CQI) result to base station feedback channel quality, feedback cooperates with multiple spot (CoMP) mould respectively CQI results under formula and non-CoMP patterns；
    The base station judges whether to CoMP patterns, and selects the CQI results under corresponding modes to be adjusted according to judged result Whole coded system (MCS) mapping；
    The base station judges whether to CoMP patterns in such a way：
    The base station obtains the kernel that WCI corresponds to code book according to the UE WCI fed back and PMIAnd calculate the skies of PMI to zero BetweenDistance D, when the distance D is less than or equal to predetermined threshold value, judge carry out CoMP patterns, when the distance D is big When the predetermined threshold value, judge to carry out non-CoMP patterns.
  2. 2. the method as described in claim 1, it is characterised in that the UE obtains CoMP patterns and non-in the following manner CQI results under CoMP patterns：
    Under CoMP patterns, the UE assumes that the precoding that serving cell uses is four corresponding to pre-coding matrix instruction (PMI) Antenna codebook, it is assumed that 1 layer and 2 layer of four antenna code that the precoding that interfered cell uses is and worst adjoint instruction (WCI) is orthogonal Originally, and by the way of statistical average draw the average statistical of the SINR under CoMP patterns；
    Under non-CoMP patterns, the UE assumes that the precoding that serving cell uses is four antenna codebooks corresponding to PMI, it is assumed that dry It is four antenna codebooks corresponding to interference channel order instruction (RI) to disturb the precoding that cell uses, and traversal RI corresponds to four antennas of the number of plies Code book, and draw by the way of statistical average the average statistical of the SINR under non-CoMP patterns；
    The UE is according to the SINR's under the average statistical and the non-CoMP patterns of the SINR under the obtained CoMP patterns Average statistical, SINR to the CQI of downlink mapping table is searched, respectively obtain the CQI under CoMP patterns and non-CoMP patterns As a result.
  3. 3. the method as described in claim 1, it is characterised in that the CQI results under the base station selected corresponding modes carry out MCS Mapping, refers to：
    The CQI results under the CoMP patterns of the UE feedbacks are selected under CoMP patterns, and search CQI to the MCS of downlink Mapping table obtain MCS a reference values；
    The CQI results under the non-CoMP patterns of the UE feedbacks are selected under non-CoMP patterns, and the CQI for searching downlink is arrived MCS mapping table obtains MCS a reference values.
  4. 4. the method as described in claim 1,2 or 3, it is characterised in that methods described also includes：
    Positive acknowledgment/NACK (ACK/NACK) result that the base station is fed back according to the UE, determine different in sliding window Weight coefficient corresponding to ACK/NACK results position, and the weight coefficient corresponding to NACK results all in sliding window is carried out Summation is added, the bit error rate (BLER) in sliding window is calculated.
  5. 5. method as claimed in claim 4, it is characterised in that
    The base station determines the weight coefficient α corresponding to ACK/NACK results position in sliding window according to the following formula1, α2..., αL：
    <mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>&amp;alpha;</mi> <mn>1</mn> </msub> <mo>+</mo> <msub> <mi>&amp;alpha;</mi> <mn>2</mn> </msub> <mo>+</mo> <mo>...</mo> <mo>+</mo> <msub> <mi>&amp;alpha;</mi> <mi>L</mi> </msub> <mo>=</mo> <mn>1</mn> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>&amp;alpha;</mi> <mn>1</mn> </msub> <mo>&lt;</mo> <msub> <mi>&amp;alpha;</mi> <mn>2</mn> </msub> <mo>&lt;</mo> <mo>...</mo> <mo>&lt;</mo> <msub> <mi>&amp;alpha;</mi> <mi>L</mi> </msub> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>,</mo> </mrow>
    Wherein, L be sliding window length, αLTo adjust nearest ACK/NACK results apart from this MCS；
    And the base station calculates BLER according to the following formula：
    BLER=(α1+α2+…+αLNack) × 100%,
    Wherein, LNack is the total number of NACK results in sliding window.
  6. 6. method as claimed in claim 4, it is characterised in that methods described also includes：
    The base station obtains BLER continuous good number BLERGoodNum and BLER according to the following formula according to the BLER being calculated Continuous poor number BLERBadNum：
    Wherein, for GoodVal to judge the preferable BLER threshold values of communication quality, BadVal is the BLER for judging that communication quality is poor Threshold value；
    And MCS amount trimmed Δs MCS is determined according to the following formula：
    Wherein, GoodCnt is the BLERGoodNum threshold values that Δ MCS increases 1 grade, and BadCnt is that Δ MCS reduces 1 etc. The BLERBadNum threshold values of level.
  7. 7. a kind of system for adjusting coded system and adaptively adjusting, it is characterised in that the system includes the CQI in user equipment MCS mapping blocks in feedback module, and base station,
    The CQI feedback module is used for, and when to base station feedback CQI results, feeds back respectively under CoMP patterns and non-CoMP patterns CQI results；
    The MCS mapping blocks are used for, and receive the CQI results under the CoMP patterns and non-CoMP patterns of UE feedbacks；Judge whether CoMP patterns are carried out, and select the CQI results under corresponding modes to carry out MCS mappings according to judged result；
    The MCS mapping blocks are used for, and judge whether to CoMP patterns in such a way：
    The WCI and PMI fed back according to the UE, obtains the kernel that WCI corresponds to code bookAnd PMI is calculated to kernelAway from From D, when the distance D is less than or equal to predetermined threshold value, judge to carry out CoMP patterns, when the distance D is more than described pre- During fixed threshold value, judge to carry out non-CoMP patterns.
  8. 8. system as claimed in claim 7, it is characterised in that the CQI feedback module obtains CoMP moulds in the following manner CQI results under formula and non-CoMP patterns：
    Under CoMP patterns, it is assumed that the precoding that serving cell uses is four antenna codebooks corresponding to PMI, it is assumed that interfered cell makes Precoding is 1 layer orthogonal with WCI and 2 layer of four antenna codebook, and is drawn by the way of statistical average under CoMP patterns SINR average statistical；
    Under non-CoMP patterns, the UE assumes that the precoding that serving cell uses is four antenna codebooks corresponding to PMI, it is assumed that dry It is four antenna codebooks corresponding to interference channel RI to disturb the precoding that cell uses, and traversal RI corresponds to four antenna codebooks of the number of plies, and The average statistical of the SINR under non-CoMP patterns is drawn by the way of statistical average；
    It is equal according to the statistics of the SINR under the average statistical of the SINR under the obtained CoMP patterns and the non-CoMP patterns Value, searches SINR to the CQI of downlink mapping table, respectively obtains the CQI results under CoMP patterns and non-CoMP patterns.
  9. 9. system as claimed in claim 7 or 8, it is characterised in that
    The MCS mapping blocks are used for, and the CQI results under the CoMP patterns of the UE feedbacks are selected under CoMP patterns, and look into CQI to the MCS of downlink mapping table is looked for obtain MCS a reference values；
    The CQI results under the non-CoMP patterns of the UE feedbacks are selected under non-CoMP patterns, and the CQI for searching downlink is arrived MCS mapping table obtains MCS a reference values.
  10. 10. system as claimed in claim 7 or 8, it is characterised in that the system also includes MCS adjusting modules,
    The MCS adjusting modules are used for, and the ACK/NACK results fed back according to UE, determine different ACK/NACK results positions in sliding window Corresponding weight coefficient is put, and the weight coefficient corresponding to NACK results all in sliding window is subjected to addition summation, is calculated The BLER in sliding window is obtained, and MCS amount trimmed Δ MCS are determined according to the BLER being calculated, using the Δ MCS to described MCS a reference values are adjusted, the MCS finally used.
  11. 11. system as claimed in claim 10, it is characterised in that
    The MCS adjusting modules are used for, and determine the weight coefficient α in sliding window corresponding to ACK/NACK results position according to the following formula1, α2..., αL：
    <mrow> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>&amp;alpha;</mi> <mn>1</mn> </msub> <mo>+</mo> <msub> <mi>&amp;alpha;</mi> <mn>2</mn> </msub> <mo>+</mo> <mo>...</mo> <mo>+</mo> <msub> <mi>&amp;alpha;</mi> <mi>L</mi> </msub> <mo>=</mo> <mn>1</mn> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>&amp;alpha;</mi> <mn>1</mn> </msub> <mo>&lt;</mo> <msub> <mi>&amp;alpha;</mi> <mn>2</mn> </msub> <mo>&lt;</mo> <mo>...</mo> <mo>&lt;</mo> <msub> <mi>&amp;alpha;</mi> <mi>L</mi> </msub> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>,</mo> </mrow>
    Wherein, L be sliding window length, αLTo adjust nearest ACK/NACK results apart from this MCS；
    And the base station calculates BLER according to the following formula：
    BLER=(α1+α2+…+αLNack) × 100%, wherein, LNack is the total number of NACK results in sliding window.
  12. 12. system as claimed in claim 10, it is characterised in that
    The MCS adjusting modules are used for, and according to the BLER being calculated, obtain the continuous good numbers of BLER according to the following formula The continuous poor number BLERBadNum of BLERGoodNum and BLER：
    Wherein, for GoodVal to judge the preferable BLER threshold values of communication quality, BadVal is the BLER for judging that communication quality is poor Threshold value；
    And MCS amount trimmed Δs MCS is determined according to the following formula：
    Wherein, GoodCnt is the BLERGoodNum threshold values that Δ MCS increases 1 grade, and BadCnt is that Δ MCS reduces 1 etc. The BLERBadNum threshold values of level.
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