CN106411474B

CN106411474B - Channel RI acquisition methods and device

Info

Publication number: CN106411474B
Application number: CN201510465542.0A
Authority: CN
Inventors: 董宇; 周秦英; 沈旭强
Original assignee: Spreadtrum Communications Shanghai Co Ltd
Current assignee: Spreadtrum Communications Shanghai Co Ltd
Priority date: 2015-07-31
Filing date: 2015-07-31
Publication date: 2019-03-19
Anticipated expiration: 2035-07-31
Also published as: CN106411474A

Abstract

A kind of channel RI acquisition methods and device, which comprises calculate subcarrier Average Mutual of corresponding broadband or subband under current transmission mode；According to the Average Mutual, obtain corresponding first CQI of single code word and with one-to-one 2nd CQI of multiple code words；The relative value for obtaining the corresponding transmission block of the first CQI obtains the relative value of the corresponding transmission block of multiple 2nd CQI respectively and sums to the relative value of the corresponding transmission block of multiple 2nd CQI obtained；Summed result is multiplied with predetermined coefficient, the relative value of obtained product transmission block corresponding with the first CQI is compared, RI is determined according to comparison result.Using the method and device, the judgement accuracy rate of RI can be effectively improved.

Description

Channel RI acquisition methods and device

Technical field

The present invention relates to wireless communication field more particularly to a kind of channel RI acquisition methods and device.

Background technique

Long term evolution (Long Term Evolution, LTE) is third generation partner program (3rd Generation Partnership Project, 3GPP) leading Universal Mobile Communication System technology long term evolution, be to be recognized extensively at present Can wireless communication technique.

Multiple-input and multiple-output (multiple-input multiple-output, MIMO) technology, refer to transmitting terminal with Receiving end uses multiple transmitting antennas and receiving antenna respectively, make signal by the mutiple antennas transmission of transmitting terminal and receiving end and It receives, so as to improve communication quality.MIMO technology makes full use of space resources, is not increasing frequency spectrum resource and antenna transmission power In the case where, system channel capacity can be increased exponentially.MIMO technology has become one of core technology in LTE.

In LTE system, LTE terminal by detect and report mimo channel matrix order instruction (Rank Indication, RI) carry out the correlation of signals base current radio channel environment, base station is according to current radio channel environment to downlink traffic channel It is scheduled, decision is the diversity signal for transmitting the MIMO signal of multiple code words or transmitting single code word by transmitting diversity.

In the prior art, LTE terminal obtains RI by the order of the channel matrix of detection pilot signal.When pilot signal is believed When road rank of matrix is less than some threshold value, channel matrix morbid state, RI=1 are determined；Otherwise determine that channel matrix is normal, RI=2.

However, the RI accuracy rate that the above method is got is lower, it is easy to appear erroneous judgement.

Summary of the invention

The embodiment of the present invention solves the problems, such as it is how to improve the judgement accuracy rate of RI.

To solve the above problems, the embodiment of the invention provides a kind of channel RI acquisition methods, comprising:

Calculate subcarrier Average Mutual of corresponding broadband or subband under current transmission mode；

According to the Average Mutual, corresponding first CQI of single code word and one-to-one with multiple code words is obtained 2nd CQI；

The relative value for obtaining the corresponding transmission block of the first CQI obtains the corresponding transmission block of multiple 2nd CQI respectively Relative value simultaneously sums to the relative value of the corresponding transmission block of multiple 2nd CQI obtained；

Summed result is multiplied with predetermined coefficient, by the opposite of obtained product transmission block corresponding with the first CQI Value is compared, and determines RI according to comparison result.

Optionally, described that RI is determined according to comparison result, comprising: when the relative value of the corresponding transmission block of the first CQI When greater than the product, determine that RI is equal to 1；When the relative value of the corresponding transmission block of the first CQI is less than or equal to the product When, determine that RI is equal to 2.

Optionally, described according to the Average Mutual, obtain corresponding first CQI of single codeword and with multiple code words one One corresponding 2nd CQI, comprising: according to the Average Mutual, calculate the awgn channel etc. under different pre-coded index modes Imitate Signal to Interference plus Noise Ratio；The equivalent Signal to Interference plus Noise Ratio of the corresponding maximum awgn channel of single code word is selected, and in different pre-coded indexes The maximum value of the sum of corresponding equivalent Signal to Interference plus Noise Ratio of awgn channel of multiple code words under mode；It makes an uproar from the equivalent letter of the awgn channel is dry Than the sum of the corresponding equivalent Signal to Interference plus Noise Ratio of multiple awgn channels of maximum value and the equivalent Signal to Interference plus Noise Ratio of the maximum awgn channel In, choose the equivalent Signal to Interference plus Noise Ratio minimum value of awgn channel；When the equivalent Signal to Interference plus Noise Ratio minimum value of the awgn channel is greater than default letter It is dry when making an uproar than thresholding, according to the corresponding relationship of preset equivalent Signal to Interference plus Noise Ratio and CQI, obtain corresponding first CQI of single code word And respectively with one-to-one 2nd CQI of multiple code words.

Optionally, the channel RI acquisition methods further include: when the equivalent Signal to Interference plus Noise Ratio minimum value of the awgn channel is less than Or when being equal to the Signal to Interference plus Noise Ratio thresholding, determine that the RI got is 1.

Optionally, described according to the Average Mutual, obtain corresponding first CQI of single codeword and with multiple code words one One corresponding 2nd CQI, comprising: maximum Average Mutual of the single code word under different pre-coded index modes is selected, And the maximum value of the sum of the Average Mutual of multiple code words under different pre-coded index modes；From the Average Mutual The sum of the corresponding multiple Average Mutuals of maximum value and the maximum Average Mutual in, select Average Mutual most Small value；When the Average Mutual minimum value is greater than default Average Mutual thresholding, according to preset Average Mutual and CQI Corresponding relationship, obtain corresponding first CQI of single code word and with one-to-one 2nd CQI of multiple code words.

Optionally, the channel RI acquisition methods further include: preset when the Average Mutual minimum value is less than or equal to When Average Mutual thresholding, determine that the RI got is 1.

Optionally, after getting the Average Mutual, further includes: select single code word in different precoding ropes Draw the sum of the Average Mutual of maximum Average Mutual and multiple code words under different pre-coded index modes under mode Maximum value；The maximum Average Mutual is compared with the maximum value of the sum of the Average Mutual；When the maximum When Average Mutual is less than or equal to the maximum value of the sum of described Average Mutual, determine that the RI got is 2；When the maximum When Average Mutual is greater than the maximum value of the sum of described Average Mutual, determine that the RI got is 1.

Optionally, after getting RI, further includes: when detecting that all RI obtained in preset duration are all the same, The RI is reported into network side；When detecting that the RI got in preset duration is inconsistent, by the RI of a upper report cycle Report to network side.

The embodiment of the invention provides a kind of channel RI acquisition device, comprising:

Computing unit, for calculating subcarrier Average Mutual of corresponding broadband or subband under current transmission mode；

CQI acquiring unit, for according to the Average Mutual, obtain corresponding first CQI of single code word and with it is more A one-to-one 2nd CQI of code word；

Transmission block relative value acquiring unit, for obtaining the corresponding transmission block of the first CQI according to preset mapping table Relative value, and obtain the relative value of the corresponding transmission block of multiple 2nd CQI respectively；

Summation unit, for the relative value summation to the corresponding transmission block of the multiple 2nd CQI；

RI determination unit, the summed result for getting the summation unit are multiplied with predetermined coefficient, by what is obtained The relative value of product transmission block corresponding with the first CQI is compared, and determines RI according to comparison result.

Optionally, the RI determination unit is used for: when the relative value of the corresponding transmission block of the first CQI is greater than described multiply When product, determine that RI is equal to 1；When the relative value of the corresponding transmission block of the first CQI is less than or equal to the product, RI etc. is determined In 2.

Optionally, the CQI acquiring unit is used for: according to the Average Mutual, calculating different pre-coded index modes Under the equivalent Signal to Interference plus Noise Ratio of awgn channel；Select the equivalent Signal to Interference plus Noise Ratio of the corresponding maximum awgn channel of single code word, Yi Ji The maximum value of the sum of corresponding equivalent Signal to Interference plus Noise Ratio of awgn channel of multiple code words under different pre-coded index modes；From the AWGN The corresponding multiple equivalent Signal to Interference plus Noise Ratio of awgn channel of the maximum value of the sum of the equivalent Signal to Interference plus Noise Ratio of channel and maximum AWGN letter In the equivalent Signal to Interference plus Noise Ratio in road, the equivalent Signal to Interference plus Noise Ratio minimum value of awgn channel is chosen；When the equivalent Signal to Interference plus Noise Ratio of the awgn channel most When small value is greater than default Signal to Interference plus Noise Ratio thresholding, according to the corresponding relationship of preset equivalent Signal to Interference plus Noise Ratio and CQI, single code word is obtained Corresponding first CQI and respectively with one-to-one 2nd CQI of multiple code words.

Optionally, the RI determination unit is also used to: when the equivalent Signal to Interference plus Noise Ratio minimum value of the awgn channel is less than or waits When the Signal to Interference plus Noise Ratio thresholding, determine that the RI got is 1.

Optionally, the CQI acquiring unit is used for: selecting single code word under different pre-coded index modes most The maximum value of the sum of big Average Mutual, and Average Mutual from multiple code words under different pre-coded index modes； From the corresponding multiple Average Mutuals of maximum value and the maximum Average Mutual of the sum of the Average Mutual, choose The minimum value of Average Mutual out；When the Average Mutual minimum value is greater than default Average Mutual thresholding, according to default Average Mutual and CQI corresponding relationship, obtain corresponding first CQI of single code word and one-to-one with multiple code words 2nd CQI.

Optionally, the RI determination unit is also used to: being preset averagely when the Average Mutual minimum value is less than or equal to When mutual information thresholding, determine that the RI got is 1.

Optionally, the RI determination unit is also used to: selecting single code word under different pre-coded index modes The maximum value of the sum of the Average Mutual of maximum Average Mutual and multiple code words under different pre-coded index modes； The maximum Average Mutual is compared with the maximum value of the sum of the Average Mutual；When the maximum Average Mutual Less than or equal to the sum of the Average Mutual maximum value when, determine the RI got be 2；When the maximum Average Mutual Greater than the sum of the Average Mutual maximum value when, determine the RI got be 1.

Optionally, the channel RI acquisition device further include: RI reporting unit, for after getting RI, when detecting When all RI obtained in preset duration are all the same, the RI is reported into network side；It is got when detecting in preset duration RI it is inconsistent when, the RI of a upper report cycle is reported into network side.

Compared with prior art, the technical solution of the embodiment of the present invention has the advantage that

The opposite of the relative value of the transmission block of single code word and the transmission block of multiple code words is obtained by Average Mutual The sum of value, the two is compared, determines RI according to comparison result, and the acquisition criterion of RI is quantified, can be effectively improved The accuracy rate of RI.

Further, when all RI got in preset duration are equal, the RI that will acquire reports to network side, Otherwise, the RI of a upper report cycle is reported into network side, so as to avoid the RI pingpang handoff got.

Detailed description of the invention

Fig. 1 is the flow chart of one of embodiment of the present invention channel RI acquisition methods；

Fig. 2 is the flow chart of another channel RI acquisition methods in the embodiment of the present invention；

Fig. 3 is the flow chart of another channel RI acquisition methods in the embodiment of the present invention；

Fig. 4 is the flow chart of another channel RI acquisition methods in the embodiment of the present invention；

Fig. 5 is the structural schematic diagram of one of embodiment of the present invention channel RI acquisition device.

Specific embodiment

LTE terminal obtains RI by the order of the channel matrix of detection reference signal, and the RI that will acquire reports to net Network side.Network side uses a code word or two code words according to the RI received, to adjudicate scheduling.In the prior art, when When the order of the channel matrix of reference signal is less than some threshold value, then channel matrix morbid state, RI=1 are determined；Conversely, determining channel Matrix is normal, RI=2.

However, in the prior art, it is difficult to more accurate threshold value is obtained, causes to be easy to appear erroneous judgement, RI judgement Accuracy rate is lower.

In embodiments of the present invention, the relative value of the transmission block of single code word and multiple is obtained by Average Mutual The two is compared by the sum of relative value of transmission block of code word, determines RI according to comparison result, by the acquisition criterion amount of RI Change, the accuracy rate of RI can be effectively improved.

It is understandable to enable the above objects, features, and advantages of the embodiment of the present invention to become apparent, it is right with reference to the accompanying drawing Specific embodiments of the present invention are described in detail.

The embodiment of the invention provides a kind of channel RI acquisition methods, referring to Fig.1, carry out below by way of specific steps detailed Explanation.

Step S101 calculates subcarrier Average Mutual of corresponding broadband or subband under current transmission mode.

In practical applications, LTE uses multiple antennas sending and receiving (MIMO) system.In the OFDM symbol with reference signal, often Root transmitting antenna is all used for transmission the transmitting antenna there are two subcarrier in a resource block (Resource Block, RB) Reference signal (Reference Signal, RS), estimates the channel circumstance between each pair of dual-mode antenna as channel for receiving end Meter.Mathematical model between the sending and receiving of mimo channel can indicate are as follows:

Y_k,l=H_k,lW_k,lX_k,l+n_k,l (1)

When antenna is that single input exports, X_k,lTo transmit symbol, H_k,lFor channel fading coefficient, Y_k,lTo receive symbol, n_k,lFor random noise.When antenna is Multiinputoutput, X_k,lTo transmit symbolic vector, H_k,lFor channel fading coefficient matrix, W_k,lFor pre-coding matrix, Y_k,lTo receive symbolic vector, n_k,lFor random noise vector, wherein k is OFDM symbol subcarrier rope Draw, l is notation index, and noise is by variances sigma²Characterization.

In specific implementation, mobile terminal can carry out channel estimation to the reference signal received, to obtain H_k,l.? Get H_k,lAfterwards, can calculate within the scope of detection bandwidth under each subcarrier current transmission mode (TM mode) various prelists Signal to Interference plus Noise Ratio (Signal to Interference under code index (Precoding Matrix indicator, PMI) mode Plus Noise Ratio, SINR).

In various PMI modes or non-PMI mould of each subcarrier under current TM mode within the scope of detection bandwidth that get Subcarrier mutual information under formula, and the subcarrier mutual information got is averaging, each subcarrier can be obtained in current TM The Average Mutual or each subcarrier in the broadband or subband under various PMI modes under mode are non-under current TM mode The Average Mutual in broadband or subband under PMI mode.Wherein, non-PMI mode is diversity mode or TM3 open loop MIMO mould Formula.

In practical applications, the transmission process of LTE downlink data can be divided into following 4 steps:

1) channel coding is carried out to data to be sent and generates code word；

2) different code words is modulated, generates modulation symbol；

3) layer mapping is carried out together to the modulated signal combination of different code words；

4) precoding is carried out to the data after layer mapping, is mapped on antenna port and sends.

The present channel RI that network side can be sent according to LTE terminal, to determine code word number that scheduling uses.Work as LTE When the RI=1 that terminal is sent, the code word number that network side scheduling uses is 1；As the RI=2 that LTE terminal is sent, network side tune Spending the code word number used is 2.

In practical applications, the code word number that network side scheduling uses is not more than the receiving antenna number of receiving end.Usually In the case of, LTE terminal, which is generally up to about, supports two receiving antennas, therefore the code word that network side scheduling uses is up to 2.

In embodiments of the present invention, LTE terminal can be according to the channel matrix H estimated_k,lAnd network side may be dispatched Number of codewords, to obtain the Average Mutual in corresponding broadband or subband respectively.When the number of codewords of network side scheduling is 1 When, calculate the Average Mutual in the corresponding various PMI modes of single code word or broadband or subband under non-PMI mode.Work as network When the number of codewords of side scheduling is multiple, calculate and the width under multiple code words correspondingly various PMI modes or non-PMI mode The Average Mutual of band or subband.

Step S102, according to the Average Mutual, obtain corresponding first CQI of single code word and with multiple code words one One corresponding 2nd CQI.

In specific implementation, equivalent additive white Gaussian noise (Additive can be calculated according to Average Mutual White Gaussian Noise, AWGN) the equivalent SINR of channel, according to the equivalent SINR of awgn channel to obtain corresponding CQI.

In embodiments of the present invention, the Average Mutual that step S101 can be got is converted into corresponding awgn channel Equivalent SINR.Corresponding to the corresponding broadband of single code word or the Average Mutual of subband, available single code word is corresponding The equivalent SINR of awgn channel；Corresponding to the corresponding broadband of multiple code words or the Average Mutual of subband, available and multiple codes The equivalent SINR of the one-to-one awgn channel of word.The equivalent SINR that will acquire is updated to equivalent SINR under preset awgn channel With the mapping table of CQI, can obtain corresponding first CQI of single code word and with one-to-one 2nd CQI of multiple code words.

For example, corresponding to the Average Mutual of the corresponding broadband of 2 code words or subband, available first code word (code1) the equivalent SINR of corresponding awgn channel_code1And the corresponding AWGN equivalent channel of second code word (code2) SINR_code2.By SINR_code1With SINR_code2It is updated in the mapping table of equivalent Signal to Interference plus Noise Ratio and CQI, code1 pairs can be obtained The CQI answered_code1And the corresponding CQI of code2_code2。

In specific implementation, it can be mutually converted due to the equivalent SINR of awgn channel with Average Mutual, it is equivalent The mapping table of SINR and CQI also can be converted Average Mutual and the mapping table of CQI.It is thus possible to directly pass through single code The corresponding Average Mutual of word obtains corresponding first CQI, and directly by being averaged correspondingly mutual trust with multiple code words Breath obtains multiple 2nd CQI.

In practical applications, there may also be other modes to obtain the first CQI and the 2nd CQI, are not repeated herein.

In embodiments of the present invention, it is getting corresponding first CQI of single code word and is being corresponded with multiple code words The 2nd CQI after, step S103 can be executed.

Step S103 obtains the relative value and the corresponding biography of multiple 2nd CQI of the corresponding transmission block of the first CQI Defeated piece of relative value.

In embodiments of the present invention, the phase of the corresponding transmission block of the first CQI can be obtained in preset mapping table To the relative value of value and the corresponding transmission block of multiple 2nd CQI.Preset mapping table be CQI and transmission block relative value it Between mapping table.

In an embodiment of the present invention, preset mapping table is the table 7.2.3-1 in 3GPP TS36.213V9.3.0, such as Shown in table 1:

Table 1

Below with reference to table 1, to the relative value for obtaining the corresponding transmission block of the first CQI and the corresponding biography of the 2nd CQI is obtained Defeated piece of relative value is illustrated.

For example, the call number for the first CQI that step S102 is got is 11, then it can know that the first CQI is corresponding according to table 1 Transmission block relative value be 567.

For another example, the call number for 2 the 2nd CQI that step S102 is got is respectively 5 and 6, then according to the available rope of table 1 The relative value for the corresponding transmission block of the 2nd CQI that quotation marks are 5 is 449, and call number is the opposite of the corresponding transmission block of 6 the 2nd CQI Value is 602.

After the relative value for getting the first CQI transmission block corresponding with the 2nd CQI, step S104~step can be executed Rapid S105.

Step S104 sums to the relative value of the corresponding transmission block of multiple 2nd CQI of acquisition.

In embodiments of the present invention, in conjunction with step S103, when the relative value for getting the corresponding transmission block of multiple 2nd CQI Later, the relative value of the corresponding transmission block of multiple 2nd CQI can be summed.

For example, being got in step S102 in 2 code words, the corresponding CQI of code1_code1Call number be that 2, code2 is corresponding CQI_code2Call number be 3, then CQI can be known according to table 1_code1The relative value of corresponding transmission block is 120, CQI_code2 The relative value of corresponding transmission block is 193, then the sum of relative value of the corresponding transmission block of 2 the 2nd CQI is 120+193=313.

Summed result is multiplied by step S105 with predetermined coefficient, by the transmission corresponding with the first CQI of obtained product The relative value of block is compared, and determines RI according to comparison result.

In specific implementation, can according to actual measurement to SINR adjust predetermined coefficient.

In embodiments of the present invention, the value range of predetermined coefficient can be between 0.8~1.2.

In embodiments of the present invention, when summed result transmission corresponding more than or equal to the first CQI with the product of predetermined coefficient When the relative value of block, RI=2 is determined；When the phase of summed result transmission block corresponding less than the first CQI with the product of predetermined coefficient When to value, RI=1 is determined.

For example, the call number of the first CQI is 6, then according to table 1, the corresponding transmission block of the first CQI that call number is 6 Relative value be 602；The call number of two the 2nd CQI is respectively 2 and 3, then the corresponding transmission block of the 2nd CQI that call number is 2 The sum of the relative value of relative value transmission block corresponding with the 2nd CQI that call number is 3 be 313.It, can as predetermined coefficient α=1 To know 602 > 313 × 1, therefore it can be determined that RI=1.

For another example, the call number of the first CQI is 6, and the relative value for the corresponding transmission block of the first CQI that call number is 6 is 602； The call number of two the 2nd CQI is respectively 3 and 5, the sum of relative value of corresponding transmission block be (193+449), predetermined coefficient α= 1.2, then 602 < (193+449) × 1.2=770.4, therefore can be determined that RI=2.

It can be seen that obtaining the relative value of the transmission block of single code word and the biography of multiple code words by Average Mutual Defeated piece of the sum of relative value, the two is compared, and determines RI according to comparison result, and the acquisition criterion of RI is quantified, can be with Effectively improve the accuracy rate of RI.

In practical applications, correspond to each subframe, corresponding RI may be not completely equivalent.When two neighboring subframe pair Whens the RI answered is not equal, for example, in the corresponding RI=2 of next subframe, then network side is in scheduling 1 in the corresponding RI=1 of current subframe It is toggled between 2 code words of a code word and scheduling, that is, there are problems that pingpang handoff.

It in embodiments of the present invention, is the RI pingpang handoff for avoiding network side from getting, it can be after getting RI, not It is that the RI of the current subframe that will acquire immediately is reported, but first detect in preset duration (for example, counted from current subframe In top n continuous subframes) whether the RI that gets all the same.When the RI got in preset duration is all the same, will acquire RI be sent to network side.When the RI got in preset duration is inconsistent, the RI of a upper report cycle is reported into network Side.

In embodiments of the present invention, the value range of preset duration can be 10ms~30ms, i.e. preset duration is continuous Time corresponding to 10 subframe~30 subframes.

For example, preset duration is 20ms.In continuous 20 subframes, the RI got is 1, then reports to RI=1 Network side.If when the corresponding RI=2 of at least one subframe, then the RI of a upper report cycle is reported in continuous 20 subframes RI=2 is then reported into network side as the RI=2 of a upper report cycle to network side.

Therefore, in preset duration, when all RI got are equal, the RI that will acquire reports to network side, Otherwise, the RI of a upper report cycle is reported into network side, so as to avoid the RI pingpang handoff got.

The channel RI acquisition methods provided in the above embodiment of the present invention are specifically addressed below by specific example.

Referring to Fig. 2, the flow chart that one of embodiment of the present invention obtains channel RI method by equivalent SINR is given, It is described in detail below by specific steps.

Step S201 obtains channel estimation results according to the reference signal received.

In embodiments of the present invention, mobile terminal can use channel estimating unit, carry out to the reference signal received Channel estimation, to know channel estimation results H_k,l。

Step S202 calculates the SINR under the various PMI modes in detection bandwidth under each current TM mode of subcarrier.

In practical applications, when LTE system is single-input single-output, the corresponding SINR of k-th of subcarrier are as follows:

When LTE system is antenna transmitting, receives diversity, the corresponding SINR of k-th of subcarrier are as follows:

Wherein, H'_k,l=H_k,lW_k,l, (H'_k,l)^HBe expressed as asking matrix H '_k,lConjugate matrices.

When LTE system is MIMO space division multiplexing, when using least mean-square error (MMSE) equilibrium, k-th of subcarrier is corresponding SINR are as follows:

Wherein,Indicate that inverse matrix takes diagonal entry.

Step S203 is calculated in detection bandwidth under the various PMI modes or non-PMI mode of each current TM mode of subcarrier Subcarrier mutual information.

In embodiments of the present invention, corresponding when getting various PMI modes of k-th of subcarrier under current TM mode After the SINR or corresponding SINR of non-PMI mode, it is various under current TM mode that k-th of subcarrier in detection bandwidth can be calculated Mutual information MI under PMI mode_k,pmiOr the mutual information MI under non-PMI mode_{k,no_pmi}, in which: pmi is PMI MODE NUMBER, No_pmi indicates that LTE system is in diversity mode or TM3 open-loop MIMO mode.

In embodiments of the present invention, the mutual trust of k-th of subcarrier in detection bandwidth can be calculated using following formula (5) Breath:

Wherein, SI (SINR_k) indicate k-th of subcarrier mutual information.

Step S204 calculates broadband under the various PMI modes or non-PMI mode of single code word and two code words or subband Average Mutual.

In embodiments of the present invention, it is up to 2 that network side, which can dispatch the number of the code word used,.It therefore, can be with It calculates separately network side and dispatches two codes of the Average Mutual and network side of corresponding broadband or subband scheduling when single code word When word, the Average Mutual of the corresponding broadband of two code words or subband.

In an embodiment of the present invention, the various of single code word and two code words are calculated separately by formula (6) and (7) The Average Mutual of broadband or subband under PMI mode or non-PMI mode:

Wherein, MI_ave,pmiFor the Average Mutual under PMI mode, MI_{ave,no_pmi}For the average mutual trust under non-PMI mode Breath.

Obtained Average Mutual is converted into corresponding equivalent SINR by step S205.

It in embodiments of the present invention, can be equivalent at corresponding equivalent by the Average Mutual got in step S204 SINR。

In an embodiment of the present invention, the Average Mutual got in step S204 is equivalent equivalent at awgn channel SINR。

In embodiments of the present invention, Average Mutual is equivalent at the equivalent SINR of corresponding awgn channel, it can obtain respectively To SINR_eff,pmiAnd SINR_{eff,no_pmi}, wherein SINR_eff,pmiFor the equivalent SINR of awgn channel under various PMI modes, SINR_{eff,no_pmi}For the equivalent SINR of awgn channel under non-PMI mode.

In an embodiment of the present invention, the Average Mutual got in step S204 is converted using formula (8) or (9) At the equivalent SINR of corresponding awgn channel:

Wherein, SINR_effIt is modifying factor for the equivalent SINR of AWGN, β, and β is by coding mode, code efficiency and current Wireless environment determines that N is subcarrier number.

SI in formula (8) is used into MI_ave,pmi、MI_{ave,no_pmi}Substitution, obtains:

Step S206, the transmission mode being presently according to LTE terminal select the corresponding maximum AWGN letter of single code word The maximum value of the sum of the corresponding equivalent SINR of awgn channel of equivalent SINR and two code word in road.

In practical applications, PMI MODE NUMBER can be multiple, that is, there are a variety of PMI modes.For example, in existing protocol In, 16 PMI modes are used when number of transmission antennas is 4, PMI MODE NUMBER is 0~15.

When network side is dispatched using single code word, different PMI moulds are calculated according to the Average Mutual under different PMI modes The equivalent SINR of awgn channel under formula, and therefrom choose the equivalent SINR of maximum awgn channel and maximum awgn channel is equivalent The corresponding PMI MODE NUMBER of SINR.When network side scheduling is using two code words, according to the average mutual trust under different PMI modes Breath calculates the equivalent SINR of awgn channel under different PMI, and the maximum value for the sum of therefrom selecting the equivalent SINR of awgn channel with And the corresponding PMI MODE NUMBER of maximum value.

In embodiments of the present invention, the sum of two equivalent SINR of the corresponding awgn channel of code word refer to that two code words are each The self-corresponding equivalent SINR of awgn channel is in the sum of domain dB, and the sum of linear domain.Following WGN channel in the embodiment of the present invention The sum of equivalent SINR is in the sum of domain dB.

When network side is dispatched using single code word, gets the corresponding PMI mode of the equivalent SINR of maximum awgn channel and compile After number, using the corresponding PMI MODE NUMBER of the equivalent SINR of maximum awgn channel as the PMI mode for reporting CQI.When network side is dispatched It, will be corresponding after getting the corresponding PMI MODE NUMBER of maximum value of the sum of equivalent SINR of awgn channel when using two code words PMI MODE NUMBER is as the PMI mode for reporting CQI.

For example, there are 16 PMI modes, it is corresponding when PMI MODE NUMBER is 7 when network side is dispatched using single code word The equivalent SINR of awgn channel it is maximum, then it is 7 corresponding that the equivalent SINR of maximum awgn channel selected, which is PMI MODE NUMBER, The equivalent SINR of awgn channel, and " 7 " will be numbered as the PMI mode for reporting CQI, that is, the PMI mode of network side is reported to compile Number " 7 " corresponding PMI mode.

When network side scheduling is using two code words, it is directed to each PMI mode, two code words exist respectively corresponding The equivalent SINR of awgn channel.By the equivalent SINR summation of two corresponding awgn channels of code word under each PMI mode, obtain Take and be worth the maximum value of the sum of maximum PMI mode and the equivalent SINR of corresponding awgn channel.

For example, obtaining two corresponding awgn channels of code word etc. under each PMI mode there are 16 PMI modes Imitate the sum of SINR.When PMI MODE NUMBER is 8, the sum of two equivalent SINR of the corresponding awgn channel of code word maximum is then selected Taking out PMI MODE NUMBER is the sum of 8 corresponding equivalent SINR of awgn channel, and will number " 8 " as the PMI mode for reporting CQI, Report to the PMI mode of network side as the corresponding PMI mode of number " 8 ".

Step S207, the sum of the corresponding maximum equivalent SINR's of the awgn channel and equivalent SINR of awgn channel of single code word In the equivalent SINR of corresponding two awgn channels of maximum value, minimum value is selected.

In embodiments of the present invention, under TM4 and TM6 mode, when network side dispatches two code words, two code word difference The corresponding maximum equivalent SINR of awgn channel may not be waited；Under TM3 mode, when network side dispatches two code words, two codes The equivalent SINR of the corresponding maximum awgn channel of word is equal.

The equivalent SINR of the corresponding maximum awgn channel of single code word and awgn channel etc. can be known from step S206 Imitate the maximum value of the sum of SINR.By two equivalent SINR of awgn channel in the maximum value of the sum of the equivalent SINR of awgn channel and most The big equivalent SINR of awgn channel is compared, and selects the equivalent SINR minimum value of awgn channel.

For example, when network side dispatches single code word, the maximum equivalent SINR of awgn channel is that PMI number is under TM4 mode The equivalent SINR:SINR of " 7 " corresponding awgn channel_code,pmi7；When network side dispatches two code words, the equivalent SINR of awgn channel The sum of maximum value be PMI number be the equivalent SINR of " 8 " corresponding awgn channel.When PMI number is " 8 ", two code words are respectively The corresponding maximum equivalent SINR of awgn channel is respectively SINR_code1,pmi8With SINR_code2,pmi8, then SINR is chosen_code,pmi7、 SINR_code1,pmi8And SINR_code2,pmi8In minimum value, execute step S208.

The minimum value selected is compared, when the minimum value selected is greater than by step S208 with default SINR thresholding When default SINR thresholding, step S209 is executed；When the minimum value selected is less than or equal to default SINR thresholding, step is executed S213。

In practical applications, presetting SINR thresholding can be set according to practical application scene.In the embodiment of the present invention In, the value range for presetting SINR thresholding is -2dB~0dB.

Step S209, obtain corresponding first CQI of single code word and with one-to-one 2nd CQI of two code words.

In embodiments of the present invention, the mapping table of the SINR and CQI that can be obtained according to emulation, it is corresponding to obtain single code word Corresponding first CQI of the equivalent SINR of maximum awgn channel, and maximum awgn channel is equivalent correspondingly with multiple code words Corresponding 2nd CQI of SINR.

In practical applications, the mapping table of SINR and CQI meets Block Error Rate (Block Error Rate, BLER) 10% It is required that.

After getting the mapping table of SINR and CQI, directly the equivalent SINR of maximum awgn channel can be substituted into, can be obtained Get corresponding CQI and CQI call number.

After getting the first CQI and the 2nd CQI, step S210 is executed.

Step S210, obtain the corresponding transmission block of the first CQI relative value and the corresponding transmission block of the 2nd CQI it is opposite Value.

It in embodiments of the present invention, can be by table 1 as described above, to obtain the corresponding transmission block of the first CQI respectively Relative value and the corresponding transmission block of corresponding 2nd CQI of two code words relative value.It is understood that can also use The mapping table of the relative value of other CQI and transmission block, to obtain the relative value of the first CQI transmission block corresponding with the 2nd CQI.

In an embodiment of the present invention, the relative value of the corresponding transmission block of the first CQI is TB_Size_{1_code}.In TM4 and Under TM6 mode, the relative value of the corresponding transmission block of two the 2nd CQI is respectively TB_Size_{2_code1}、TB_Size_{2_code2}, TB_ Size_{2_code1}With TB_Size_{2_code2}It may not wait.Under TM3 mode, TB_Size_{2_code1}=TB_Size_{2_code2}。

The relative value of the corresponding transmission block of two the 2nd CQI is added summation by step S211.

In an embodiment of the present invention, the TB_Size that will be got in step S210_{2_code1}With TB_Size_{2_code2}It is added, Obtain sum of the two TB_Size_{2_code}。

Step S212, by TB_Size_{1_code}With α × TB_Size_{2_code}It is compared.

Work as TB_Size_{1_code}> α × TB_Size_{2_code}When, execute step S213；Work as TB_Size_{1_code}≤α×TB_ Size_{2_code}When, execute step S214.

In embodiments of the present invention, the value range of α can be 1.2~0.8.

Step S213 determines RI=1.

Step S214 determines RI=2.

Step S215 judges whether the RI continuously acquired in preset duration is identical.

In embodiments of the present invention, preset duration is the corresponding duration of continuous N number of subframe, and the value range of N is 10~30. When the RI got in continuous N number of subframe is all the same, step S216 is executed；When the RI got in continuous N number of subframe is endless When complete consistent, step S217 is executed.

Step S216, the RI that will acquire report to network side.

For example, RI=1 when the RI got is 1, is then reported to network side in 20 subframes by N=20.

The RI that a upper report cycle reports is reported to network side by step S217.

For example, N=20, in 20 subframes, the case where RI got is not 1, and there are RI=2, if on upper one The RI=1 for reporting periodic report, then report to network side for RI=2.

Referring to Fig. 3, the process that one of embodiment of the present invention obtains channel RI method by Average Mutual is given Figure, is described in detail below by specific steps.

Step S301 obtains channel estimation results according to the reference signal received.

Step S302 calculates the SINR in detection bandwidth under the various PMI modes of each current TM mode of subcarrier.

Step S303 is calculated in detection bandwidth under the various PMI modes or non-PMI mode of each current TM mode of subcarrier Subcarrier mutual information.

Step S304 calculates broadband under the various PMI modes or non-PMI mode of single code word and two code words or subband Average Mutual.

In embodiments of the present invention, the specific implementation procedure of step S301~step S304 is referred to step S201~step Rapid S204, is not repeated herein.

Step S305 chooses the corresponding maximum Average Mutual of single code word and the corresponding Average Mutual of two code words The sum of maximum value.

In embodiments of the present invention, available various when network side dispatches single code word under TM4 and TM6 mode The corresponding Average Mutual of PMI mode, and maximum average mutual trust is selected from the corresponding Average Mutual of all PMI modes Breath, by the number of the corresponding PMI mode of maximum Average Mutual as the PMI mode for reporting CQI.

In embodiments of the present invention, the sum of corresponding Average Mutual of two code words refers to the sum of linear domain, rather than the domain dB The sum of.

When network side dispatches two code words, for each PMI mode, available two code words are corresponding The corresponding Average Mutual of two code words under each PMI mode is summed, and therefrom chooses two respectively by Average Mutual The maximum value of the sum of a corresponding Average Mutual of code word, and using the number of the corresponding PMI mode of maximum value as reporting The PMI mode of CQI.

For example, number is followed successively by 0~15 there are 16 kinds of PMI modes.When network side dispatches single code word, PMI number is Corresponding Average Mutual is maximum when " 1 ", then will number " 1 " as the PMI mode for reporting CQI, that is, report to the PMI of network side Mode is the corresponding PMI mode of number " 1 ".

When network side dispatches two code words, when PMI number is " 8 ", the sum of Average Mutual of code1 and code2 is most Greatly, then by the number " 8 " of PMI mode as the PMI mode for reporting CQI.

Step S306, it is corresponding with the maximum value of the sum of Average Mutual in the corresponding maximum Average Mutual of single code word In two Average Mutuals, minimum value is selected.

For example, when network side dispatches single code word, when PMI number is " 7 ", single code word is corresponding under TM4 mode Average Mutual is maximum, and maximum Average Mutual is MI_code,pmi7；It is " 8 " in PMI number when network side dispatches two code words When the sum of two corresponding Average Mutuals of code word maximum, two code words are corresponding average mutual when PMI number is " 8 " Information is MI_code1,pmi8With MI_code2,pmi8, then MI is chosen_code,pmi7、MI_code1,pmi8And MI_code2,pmi8In minimum value, hold Row step S307.

In embodiments of the present invention, under TM4 and TM6 mode, when network side dispatches two code words, two code word difference Corresponding maximum Average Mutual may not wait；Under TM3 mode, when network side dispatches two code words, two code words are corresponding Maximum Average Mutual it is equal.

The minimum value selected is compared by step S307 with default MI thresholding, when the minimum value selected is greater than in advance If when MI thresholding, executing step S308；When the minimum value selected is less than or equal to default MI thresholding, step S312 is executed.

In practical applications, presetting MI thresholding can be set according to practical application scene.In embodiments of the present invention, The value range of default MI thresholding is the corresponding Average Mutual of -2dB~0dB.

Step S308, obtain corresponding first CQI of single code word and with one-to-one 2nd CQI of two code words.

In embodiments of the present invention, the mapping table of the MI and CQI that can be obtained according to emulation, it is corresponding to obtain single code word Corresponding first CQI of maximum Average Mutual, and with multiple code words maximum Average Mutual corresponding second correspondingly CQI。

In practical applications, the mapping table of MI and CQI meets the requirement of BLER10%.

After getting the mapping table of MI and CQI, directly maximum MI can be substituted into, can get corresponding CQI with And CQI call number.

After getting the first CQI and the 2nd CQI, step S309 is executed.

Step S309, obtain the corresponding transmission block of the first CQI relative value and the corresponding transmission block of the 2nd CQI it is opposite Value.

It in embodiments of the present invention, can be by table 1 as described above, to obtain the corresponding transmission block of the first CQI respectively Relative value and the corresponding transmission block of two the 2nd CQI relative value.It can also be using the opposite of others CQI and transmission block The mapping table of value, to obtain the relative value of the first CQI transmission block corresponding with the 2nd CQI.

The relative value of the corresponding transmission block of two the 2nd CQI is added summation by step S310.

In embodiments of the present invention, by TB_Size_{2_code1}With TB_Size_{2_code2}It is added, obtains sum of the two TB_ Size_{2_code}。

Step S311, by TB_Size_{1_code}With α × TB_Size_{2_code}It is compared.

Work as TB_Size_{1_code}> α × TB_Size_{2_code}When, execute step S312；Work as TB_Size_{1_code}≤α×TB_ Size_{2_code}When, execute step S313.

In embodiments of the present invention, the value range of α can be 1.2~0.8.

Step S312 determines RI=1.

Step S313 determines RI=2.

Step S314 judges whether the RI continuously acquired in preset duration is identical.

In embodiments of the present invention, preset duration is the corresponding duration of continuous N number of subframe.The value range of N is 10~30. When the RI that continuous N number of subframe is got is all the same, step S315 is executed；Otherwise, step S316 is executed.

Step S315, the RI that will acquire report to network side.

The RI that a upper report cycle reports is reported to network side by step S316.

Referring to Fig. 4, the stream that the another kind in the embodiment of the present invention obtains channel RI method by Average Mutual is given Cheng Tu after step S305 executes completion, executes step S406 in conjunction with Fig. 3.

Step S406, by the maximum value MI of the sum of the corresponding Average Mutual of two code words_{ave,2_code}With single code word pair The maximum Average Mutual MI answered_{ave,1_code}It is compared.

Work as MI_{ave,1_code}> MI_{ave,2_code}When, execute step S407；Work as MI_{ave,1_code}≤MI_{ave,2_code}When, execute step Rapid S408.

Step S407 determines RI=1.

Step S408 determines RI=2.

In embodiments of the present invention, after the completion of the execution of step S407, S408, step S409 can be executed.

Whether step S409, the RI for judging that continuous 20 subframes are got are identical.

In embodiments of the present invention, when the RI that continuous 20 subframes are got is all the same, step S410 is executed；When continuous When the RI that 20 subframes are got is not quite identical, step S411 is executed.

Step S410, the RI that will acquire report to network side.

The RI that a upper report cycle reports is reported to network side by step S411.

Step S410~step S411 is referred to step S216~step S217.

Referring to Fig. 5, the embodiment of the invention provides a kind of channel RI acquisition device 50, comprising: computing unit 501, CQI are obtained Take unit 502, transmission block relative value acquiring unit 503, summation unit 504 and RI determination unit 505, in which:

Computing unit 501, for calculating the average mutual trust of subcarrier corresponding broadband or subband under current transmission mode Breath；

CQI acquiring unit 502, for according to the Average Mutual, obtain corresponding first CQI of single code word and with Multiple one-to-one 2nd CQI of code word；

Transmission block relative value acquiring unit 503, for obtaining the corresponding biography of the first CQI according to preset mapping table Defeated piece of relative value, and the relative value of the corresponding transmission block of multiple 2nd CQI is obtained respectively；

Summation unit 504, for the relative value summation to the corresponding transmission block of the multiple 2nd CQI；

RI determination unit 505, the summed result for getting the summation unit 504 are multiplied with predetermined coefficient, will The relative value of obtained product transmission block corresponding with the first CQI is compared, and determines RI according to comparison result.

In specific implementation, the RI determination unit 505 can be used for: when the phase of the corresponding transmission block of the first CQI When being greater than the product to value, determine that RI is equal to 1；Described in being less than or equal to when the relative value of the corresponding transmission block of the first CQI When product, determine that RI is equal to 2.

In specific implementation, the CQI acquiring unit 502 can be used for: according to the Average Mutual, calculate different pre- The equivalent Signal to Interference plus Noise Ratio of awgn channel under code index mode；It is dry to select the corresponding maximum equivalent letter of awgn channel of single code word Make an uproar ratio, and under different pre-coded index modes the sum of corresponding equivalent Signal to Interference plus Noise Ratio of awgn channel of multiple code words maximum Value；From the equivalent Signal to Interference plus Noise Ratio of the corresponding multiple awgn channels of the maximum value of the sum of the equivalent Signal to Interference plus Noise Ratio of the awgn channel and institute It states in the equivalent Signal to Interference plus Noise Ratio of maximum awgn channel, chooses the equivalent Signal to Interference plus Noise Ratio minimum value of awgn channel；When described awgn channel etc. When imitating Signal to Interference plus Noise Ratio minimum value and being greater than default Signal to Interference plus Noise Ratio thresholding, according to the corresponding relationship of preset equivalent Signal to Interference plus Noise Ratio and CQI, Obtain corresponding first CQI of single code word and respectively with one-to-one 2nd CQI of multiple code words.

In specific implementation, the RI determination unit 505 can be also used for: when the equivalent Signal to Interference plus Noise Ratio of the awgn channel most When small value is less than or equal to the Signal to Interference plus Noise Ratio thresholding, determine that the RI got is 1.

In specific implementation, the CQI acquiring unit 502 can be used for: select single code word in different precodings The Average Mutual of maximum Average Mutual and multiple code words under different pre-coded index modes under indexing model it The maximum value of sum；It is average mutual from the corresponding multiple Average Mutuals of the maximum value of the sum of the Average Mutual and the maximum In information, the minimum value of Average Mutual is selected；When the Average Mutual minimum value is greater than default Average Mutual thresholding When, according to the corresponding relationship of preset Average Mutual and CQI, obtain corresponding first CQI of single code word and with multiple codes One-to-one 2nd CQI of word.

In specific implementation, the RI determination unit 505 can be also used for: when the Average Mutual minimum value is less than or When equal to default Average Mutual thresholding, determine that the RI got is 1.

In specific implementation, the RI determination unit 505 can be also used for: select single code word in different precodings The Average Mutual of maximum Average Mutual and multiple code words under different pre-coded index modes under indexing model it The maximum value of sum；The maximum Average Mutual is compared with the maximum value of the sum of the Average Mutual；When it is described most When big Average Mutual is less than or equal to the maximum value of the sum of described Average Mutual, determine that the RI got is 2；When it is described most When big Average Mutual is greater than the maximum value of the sum of described Average Mutual, determine that the RI got is 1.

In specific implementation, the channel RI acquisition device 50 can also include: RI reporting unit 506, for obtaining To after RI, when detecting that all RI obtained in preset duration are all the same, the RI is reported into network side；It is pre- when detecting If the RI got in duration is inconsistent, the RI of a upper report cycle is reported into network side.

Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of above-described embodiment is can It is completed with instructing relevant hardware by program, which can be stored in a computer readable storage medium, storage Medium may include: ROM, RAM, disk or CD etc..

Although present disclosure is as above, present invention is not limited to this.Anyone skilled in the art are not departing from this It in the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute Subject to the range of restriction.

Claims

1. a kind of channel RI acquisition methods characterized by comprising

According to the Average Mutual, obtain corresponding first CQI of single code word and with multiple code words one-to-one second CQI；

The relative value for obtaining the corresponding transmission block of the first CQI obtains the opposite of the corresponding transmission block of multiple 2nd CQI respectively Value, and sum to the relative value of the corresponding transmission block of multiple 2nd CQI obtained；

Summed result is multiplied with predetermined coefficient, by the relative value of obtained product transmission block corresponding with the first CQI into Row compares, and determines RI according to comparison result, comprising: when the relative value of the corresponding transmission block of the first CQI is greater than the product When, determine that RI is equal to 1；When the relative value of the corresponding transmission block of the first CQI is less than or equal to the product, determine that RI is equal to 2。

2. channel RI acquisition methods as described in claim 1, which is characterized in that it is described according to the Average Mutual, it obtains Corresponding first CQI of single codeword and with one-to-one 2nd CQI of multiple code words, comprising:

According to the Average Mutual, the equivalent Signal to Interference plus Noise Ratio of awgn channel under different pre-coded index modes is calculated；

Select the corresponding maximum equivalent Signal to Interference plus Noise Ratio of awgn channel of single code word, and under different pre-coded index modes it is more The maximum value of the sum of the corresponding equivalent Signal to Interference plus Noise Ratio of awgn channel of a code word；

From the equivalent Signal to Interference plus Noise Ratio of the corresponding multiple awgn channels of the maximum value of the sum of the equivalent Signal to Interference plus Noise Ratio of the awgn channel and In the equivalent Signal to Interference plus Noise Ratio of the maximum awgn channel, the equivalent Signal to Interference plus Noise Ratio minimum value of awgn channel is chosen；

It is dry according to preset equivalent letter when the equivalent Signal to Interference plus Noise Ratio minimum value of the awgn channel is greater than default Signal to Interference plus Noise Ratio thresholding Make an uproar than the corresponding relationship with CQI, obtain corresponding first CQI of single code word and respectively with multiple code words one-to-one second CQI。

3. channel RI acquisition methods as claimed in claim 2, which is characterized in that further include: when the equivalent letter of the awgn channel It is dry make an uproar than minimum value be less than or equal to the Signal to Interference plus Noise Ratio thresholding when, determine the RI got be 1.

4. channel RI acquisition methods as described in claim 1, which is characterized in that it is described according to the Average Mutual, it obtains Corresponding first CQI of single codeword and with one-to-one 2nd CQI of multiple code words, comprising:

Maximum Average Mutual and multiple code word of the single code word under different pre-coded index modes are selected in difference Pre-coded index mode under the sum of Average Mutual maximum value；

From the corresponding multiple Average Mutuals of maximum value and the maximum Average Mutual of the sum of the Average Mutual, Select the minimum value of Average Mutual；

When the Average Mutual minimum value is greater than default Average Mutual thresholding, according to preset Average Mutual and CQI Corresponding relationship, obtain corresponding first CQI of single code word and with one-to-one 2nd CQI of multiple code words.

5. channel RI acquisition methods as claimed in claim 4, which is characterized in that further include: when the Average Mutual is minimum When value is less than or equal to default Average Mutual thresholding, determine that the RI got is 1.

6. channel RI acquisition methods as described in claim 1, which is characterized in that after getting the Average Mutual, also Include:

The maximum Average Mutual is compared with the maximum value of the sum of the Average Mutual；

When the maximum Average Mutual is less than or equal to the maximum value of the sum of described Average Mutual, the RI got is determined It is 2；

When the maximum Average Mutual is greater than the maximum value of the sum of described Average Mutual, determine that the RI got is 1.

7. channel RI acquisition methods as described in any one of claims 1 to 6, which is characterized in that after getting RI, also wrap It includes:

When detecting that all RI obtained in preset duration are all the same, the RI is reported into network side；

When detecting that the RI got in preset duration is inconsistent, the RI of a upper report cycle is reported into network side.

8. a kind of channel RI acquisition device characterized by comprising

CQI acquiring unit, for according to the Average Mutual, obtain corresponding first CQI of single code word and with multiple codes One-to-one 2nd CQI of word；

Transmission block relative value acquiring unit, for obtaining the phase of the corresponding transmission block of the first CQI according to preset mapping table To value, and the relative value of the corresponding transmission block of multiple 2nd CQI is obtained respectively；

RI determination unit, the summed result for getting the summation unit are multiplied with predetermined coefficient, the product that will be obtained The relative value of transmission block corresponding with the first CQI is compared, and determines RI according to comparison result, comprising: when described first When the relative value of the corresponding transmission block of CQI is greater than the product, determine that RI is equal to 1；When the corresponding transmission block of the first CQI When relative value is less than or equal to the product, determine that RI is equal to 2.

9. channel RI acquisition device as claimed in claim 8, which is characterized in that the CQI acquiring unit is used for:

10. channel RI acquisition device as claimed in claim 9, which is characterized in that the RI determination unit is also used to: when described When the equivalent Signal to Interference plus Noise Ratio minimum value of awgn channel is less than or equal to the Signal to Interference plus Noise Ratio thresholding, determine that the RI got is 1.

11. channel RI acquisition device as claimed in claim 8, which is characterized in that the CQI acquiring unit is used for:

From the corresponding multiple Average Mutuals of maximum value and the maximum Average Mutual of the sum of the Average Mutual, Select Average Mutual minimum value；

12. channel RI acquisition device as claimed in claim 11, which is characterized in that the RI determination unit is also used to: working as institute When stating Average Mutual minimum value less than or equal to default Average Mutual thresholding, determine that the RI got is 1.

13. channel RI acquisition device as claimed in claim 8, which is characterized in that the RI determination unit is also used to:

14. the channel RI acquisition device as described in any one of claim 8~13, which is characterized in that further include: RI reporting unit, For:

After getting RI, when detecting that all RI obtained in preset duration are all the same, the RI is reported into network side；