CN102104442A - Channel quality indicator correction method and device - Google Patents
Channel quality indicator correction method and device Download PDFInfo
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- CN102104442A CN102104442A CN2009102612105A CN200910261210A CN102104442A CN 102104442 A CN102104442 A CN 102104442A CN 2009102612105 A CN2009102612105 A CN 2009102612105A CN 200910261210 A CN200910261210 A CN 200910261210A CN 102104442 A CN102104442 A CN 102104442A
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Abstract
The invention discloses a channel quality indicator correction method and a channel quality indicator correction device. The method comprises the following steps of: acquiring an estimated receiving signal to noise ratio (SNR), performing cyclic redundancy check (CRC) detection after the processing of a transmission channel, and counting the number of CRC errors; and correcting the SNR according to the number of the CRC errors, and determining a recommended modulation format (RMF) and a recommended transmission block size (RTBS) for reporting according to the corrected SNR; or obtaining an initial transmission block index according to the SNR, correcting the transmission block index according to the number of the CRC errors and determining the RMF and the RTBS for reporting according to the corrected transmission block index. By the method and the device, the real-time and accuracy of channel quality indicator (CQI) reporting can be improved by counting the number of the CRC errors to correct the estimated SNR or the obtained transmission block size; the method and the device are simply designed and convenient to implement; and the receiving SNR or the transmission block index is corrected at two regulation levels so as to achieve control flexibility.
Description
Technical field
The present invention relates to the bearing calibration and the device of the channel quality indication in a kind of mobile communication system, relate in particular to the modification method and the device of channel quality indication in the HSDPA link of TD-SCDMA communication system.
Background technology
In order to satisfy the requirement of growing transmission rate, high speed downlink packet access (High Speed Downlink Packet Access, HSDPA) technology have been introduced in the TD-SCDMA communication system.HSDPA comprises two main key technologies: mix automatically and retransmit (Hybrid Auto RepeatRequest, HARQ) and Adaptive Modulation and Coding (Adaptive Modulation and Coding, AMC).The HARQ technology combines forward error correction coding and automatic retransmission technique, UE (user terminal) detects the transmission block that receives by CRC (cyclic redundancy code), make mistakes if detect, then tell the base station to need the retransmission data bag by feedback channel, UE merges the transmission data of each time repeating transmission, thereby improved the decoding performance of system, reduced the error rate.The AMC technology is to choose parameters such as transmission block size and modulation system according to current channel circumstance is next adaptive, thereby realizes the transmission rate maximization under the prerequisite that guarantees certain performance.UE needs to estimate to reflect the received signal to noise ratio of channel quality quality in this process, then according to received signal to noise ratio (SNR), produce corresponding transmission block size (RTBS) and the recommendation modulation system (RMF) of recommending, and give the base station with these feedback information, when the base station sends HS-DSCH (High-Speed Downlink Shared Channel high speed descending sharing channel) in next time, send with regard to using the transmission block size and the modulation system of recommending.
In the AMC technology link of most critical be how according to the received signal to noise ratio of estimating obtain the channel quality indication (Channel Quality Indicator, CQI), i.e. RTBS and RMF.The order of accuarcy of CQI directly has influence on throughput and the performance of HSDPA.Existing patent documentation: number of patent application is the method that 200710063981.4 Chinese patent " obtains the method and apparatus of CQI and the method that SINR is mapped to CQI " and provided a kind of CQI of acquisition, this method at first obtains the equivalent code check (ratio of the bit number after the bit number behind the CRC coding and the second time rate-matched of HS-DSCH by emulation, scope is between 1/3～1) and the mapping table of SNR, as depicted in figs. 1 and 2.And the switching point of definite QPSK (Quadrature Phase Shift Keying quarternary phase-shift keying (QPSK) signal) and 16QAM (quadrature amplitude modulation that 16Quadrature Amplitude Modulation is 16), then these information are existed in the internal memory of UE, during practical application, UE estimates received signal to noise ratio, the SNR that compares estimated snr and modulation system switching point then, if estimated snr more than or equal to switching point SNR, then uses 16QAM, otherwise use QPSK.Search the mapping table of equivalent code check and SNR simultaneously, find the equivalent code check of the SNR correspondence that is not more than this estimated snr, calculate the transmission block size.If the transmission block size is TB_size, equivalent code check is code_rate, then has
TB_size＝floor(RM_bits*code_rate)-24-4*cb_num (1)
Wherein, RM_bits represents the bit number after the rate-matched second time, can obtain according to code channel resource and modulation system; Cb_num represents to import the code block number of Turbo encoder; Floor () represents downward bracket function.
Though said method can improve the throughput of HSDPA to a certain extent, has some defectives:
(1) this method is in a TTI (Transmission Time Interval), carries out emulation under the situation of fixed physical resource, in the real system, and different HSDPA business, a TTI corresponding physical resource (timeslot number, code channel number) is also different.
(2) the CQI form in this method carries out emulation under the awgn channel model, actual wireless channel environment than the awgn channel circumstance complication many.And CQI obtains in current TTI, uses for next TTI, and this just requires CQI that good real-time must be arranged, and for fast-changing channel, the CQI that obtains of emulation will not possess the real-time of getting well like this.
(3) RTBS that determines of this method is often bigger than normal, can cause the reception Block Error Rate of HS-DSCH to increase (greater than 0.1) like this, and throughput of system descends.
Summary of the invention
The invention provides a kind of method and apparatus of revising the channel quality indication, overcome bad, the not accurate enough shortcoming of acquisition CQI real-time in the prior art, add up by the increase crc error and revise CQI.
In order to solve the problems of the technologies described above, the invention provides the bearing calibration of a kind of channel quality indication (CQI), comprise: obtain the received signal to noise ratio of estimating (SNR),, carry out the number that CRC (CRC) detected and added up crc error through after the processing of transmission channel; Count the described SNR of correction according to described crc error, determine the recommendation modulation system (RMF) that reports and recommend transmission block size (RTBS) according to revised SNR; Perhaps, obtain initial transmitting block index, count the described transmitting block index of correction according to described crc error again, determine the RMF and the RTBS that report according to revised transmitting block index according to described SNR.
Further, count the described SNR of correction according to described crc error, determine the RMF that reports according to revised SNR, and show to obtain corresponding equivalent code check according to revised SNR inquiry CQI and determine the transmission block size, and obtain corresponding transmitting block index, the RTBS of transmission block size for reporting of this transmitting block index correspondence by the inquiry of the size of described transmission block.
Further, if high-speed downlink shared channel (HS-DSCH) classification is only supported quarternary phase-shift keying (QPSK) signal (QPSK) modulation system, the then RMF that directly selects the QPSK modulation system to report as CQI; Otherwise whether more described revised SNR more than or equal to the SNR of modulation system switching point, if, the RMF that adopts 16 quadrature amplitude modulation (16QAM) modulation system to report as CQI; Otherwise, the RMF that adopts the QPSK modulation system to report as CQI.
Further, search CQI table, find in the CQI table SNR, utilize the equivalent code check of its correspondence to calculate transmission block size (TBsize) less than the value maximum of the SNR that equals to revise according to revised SNR; Search the TB size of HS-DSCH classification correspondence of this reception and the mapping table of transmitting block index according to described TB size, find the pairing transmitting block index of transmission block smaller or equal to the value maximum of described TB size as the RTBS that reports; If the SNR that revises less than the SNR of CQI form intermediate value minimum, then selects the equivalent code check of the SNR correspondence of CQI form intermediate value minimum to calculate transmission block size TB size; If described TB size less than TB size minimum in the TB size mapping table of HS-DSCH classification correspondence, selects the transmitting block index of minimum TB size correspondence as the RTBS that reports so.
Further, if the crc error number greater than first thresholding, is made as first correction value with the correction step-length of SNR; If the crc error number is smaller or equal to first thresholding and greater than second thresholding, the correction step-length of SNR is made as second correction value, if the crc error number smaller or equal to second thresholding, is made as 0 with the correction step-length of SNR; The SNR that revises equals described SNR and deducts described correction step-length.
Further, obtain corresponding equivalent code check according to described SNR inquiry CQI table and determine the transmission block size, and obtain initial transmitting block index by the size of described transmission block, count the described initial transmitting block index of correction according to described crc error again, determine the RMF and the RTBS that report according to revised transmitting block index.
Further, if the ability grade of user terminal is only supported the QPSK modulation system, the direct RMF that selects the QPSK modulation system to report as CQI, otherwise, whether more described SNR is more than or equal to the SNR of modulation system switching point, if adopting the 16QAM modulation system is the initial modulation mode, otherwise adopting the QPSK modulation system is the initial modulation mode.
Further, when the initial modulation mode is the QPSK modulation system, the RMF that directly selects the QPSK modulation system to report as CQI; When the initial modulation mode is the 16QAM modulation system, calculate the equivalent code check of revised transmitting block index, and relatively its whether more than or equal to the equivalent code check of modulation system switching point, if, then the 16QAM modulation system is the RMF that CQI reports, and the index of revised transmission block size is the RTBS that CQI reports; Otherwise, the QPSK modulation system is the RMF that CQI reports, use the maximum equivalent code check of QPSK to calculate the RTBS that CQI reports in the CQI form, perhaps select suitable equivalent code check to calculate the RTBS that CQI reports according to the difference size of the equivalent code check of the equivalent code check of revised transmitting block index and modulation system switching point.
Further, if the crc error number greater than first thresholding, is made as first correction value with the correction step-length of transmitting block index; If the crc error number is smaller or equal to first thresholding and greater than second thresholding, the correction step-length of transmitting block index is made as second correction value, if the crc error number smaller or equal to second thresholding, is made as 0 with the correction step-length of transmitting block index; The transmitting block index of revising equals described initial transmitting block index and deducts described correction step-length.
In order to solve the problems of the technologies described above, the present invention also provides the means for correcting of a kind of channel quality indication (CQI), comprising: information acquisition module and correcting module, wherein,
Described information acquisition module is used to obtain the received signal to noise ratio of estimating (SNR), through after the processing of transmission channel, carries out the number that CRC (CRC) detected and added up crc error, and described SNR and crc error number are sent to described correcting module;
Described correcting module is used for counting the described SNR of correction according to described crc error, determines the recommendation modulation system (RMF) that reports and recommends transmission block size (RTBS) according to revised SNR; Perhaps, obtain initial transmitting block index, count the described transmitting block index of correction according to described crc error again, determine the RMF and the RTBS that report according to revised transmitting block index according to described SNR.
Technique effect of the present invention:
(1) revises the received signal to noise ratio of estimation by statistics CRC or the transport block size index that obtains can increase real-time and the accuracy that CQI reports;
(2) this method and device simplicity of design are convenient to realize;
(3) adjust rank by two and come corrected received signal to noise ratio or transmitting block index, control flexibly.C wherein
1, c
2The frequency that control is revised, Δ SNR
1, Δ SNR
2Perhaps Δ index
1, index
2The degree that control is revised.
Description of drawings
Fig. 1 is a CQI form schematic diagram of only supporting the HS-DSCH classification use of QPSK;
Fig. 2 is the CQI form schematic diagram that the HS-DSCH classification all supported of QPSK and 16QAM is used;
Fig. 3 is the block diagram that CQI of the present invention revises implementation method one;
Fig. 4 is the block diagram that CQI of the present invention revises implementation method two;
Fig. 5 is the schematic diagram that CQI revises first embodiment of implementation method in the embodiment of the invention;
Fig. 6 is the schematic diagram that CQI revises second embodiment of implementation method in the embodiment of the invention;
Fig. 7 is the structure chart of CQI means for correcting in the embodiment of the invention.
Embodiment
Below will cooperate graphic and embodiment describes embodiments of the present invention in detail, by this to the present invention how the application technology means implementation procedure that solves technical problem and reach the technology effect can fully understand and implement according to this.
Core of the present invention relates to following two parts algorithm:
As shown in Figure 3, for revise the method schematic diagram (this schematic diagram does not comprise the concrete steps details, only for explaining this programme on the whole) of realizing that CQI proofreaies and correct by SNR;
(1) JD (joint-detection) estimates SNR;
(2) carry out transmission channel and handle, comprise that constellation separates rearrangement, deinterleaving, bit descrambling, separates bit and merge, separate processing procedures such as rate-matched (twice), Turbo decoding;
(3) carry out CRC and detect, and the number of statistics crc error;
(4) utilize the crc error number of adding up to revise the SNR of estimation, according to the difference of wrong number, the step-length of adjustment also has difference;
This programme has provided two and has adjusted ranks: when wrong number greater than c
1The time, the adjustment step-length of SNR is Δ SNR
1, when wrong number greater than c
2The time, the step-length of the adjustment of SNR is Δ SNR
2, revised SNR is designated as SNR
Rv
(5) look into the CQI table according to revised SNR;
If the HS-DSCH classification is only supported QPSK, the RMF that directly selects QPSK to report as CQI, otherwise, compare SNR
RvWith the SNR of modulation system switching point, if SNR
RvMore than or equal to the SNR of modulation system switching point, the RMF that then adopts the 16QAM modulation system to report as CQI; Otherwise, the RMF that uses the QPSK modulation system to report as CQI;
And according to SNR
RvLook into the corresponding equivalent code check of CQI table acquisition and calculate the RTBS that reports.
As shown in Figure 4, the method schematic diagram (this schematic diagram does not comprise the concrete steps details, only for explaining this programme on the whole) for realizing that by the transmitting block index correction CQI proofreaies and correct;
(1) JD (joint-detection) estimates SNR, and the SNR of estimation is designated as SNR
Es
Carry out transmission channel and handle, comprise that constellation separates rearrangement, deinterleaving, bit descrambling, separates bit and merge, separate processing procedures such as rate-matched (twice), Turbo decoding;
(3) carry out CRC and detect, and the number of statistics crc error;
(4) look into the CQI table according to the SNR that estimates;
If the ability grade of user terminal UE is only supported QPSK, the modulation system of directly selecting QPSK to report as CQI, otherwise, compare SNR
EsWith the SNR of modulation system switching point, if SNR
EsMore than or equal to the SNR of switching point, the initial modulation mode is 16QAM, otherwise is QPSK;
And according to SNR
EsComputation of table lookup transmission block size, the note transmitting block index is index
Ini
(5) transmitting block index of utilizing the crc error number of statistics to revise to obtain number, according to the difference of wrong number, the size of the call number of adjustment is also different;
This programme has provided two and has adjusted ranks: when wrong number greater than c
1The time, transmitting block index index
IniThe adjustment step-length be Δ index
1, when wrong number greater than c
2The time, index
IniThe adjustment step-length be index
2, revised transmitting block index is designated as index
Rv
(6), determine the RMF and the RTBS that report according to revised transmission block size;
For the initial modulation mode is that the direct selection QPSK of QPSK is as RMF, otherwise, the equivalent code check (being designated as λ) behind the transmission block is revised in calculating, and make comparisons with the equivalent code check of switching point, if λ is more than or equal to the code check of switching point, then the initial modulation mode (16QAM) of Que Dinging is the RMF that finally reports, and the RTBS that reports is the index index of revised transmission block size
RvIf λ is less than the equivalent code check of switching point, the RMF that then finally reports is QPSK, the RTBS that CQI reports perhaps selects suitable equivalent code check to calculate according to the difference size of λ and switching point equivalence code check by using the maximum equivalent code check of QPSK to calculate in the CQI form.
First embodiment that the present invention proposes realizes that about revising by SNR CQI proofreaies and correct, and as shown in Figure 5, comprises the steps:
Step 1000 is carried out initialization operation, mainly comprises: the crc error counter puts 0;
Initialization operation is only done once when the professional initiation of HSDPA;
Here the signal power and the noise power of each time slot in HS-DSCH (the High-Speed Downlink Shared Channel high-speed downlink shared channel) TTI (Transmission Time Interval Transmission Time Interval) need to add up respectively, then both are divided by and try to achieve the average SNR of estimation, be above-mentioned received signal to noise ratio;
Step 1020 is carried out transmission channel processing and CRC and is detected;
Transmission channel is handled, and comprising: constellation separates rearrangement, deinterleaving, bit descrambling, separate bit merges, separates rate-matched (twice), Turbo decoding or the like processing procedure;
C wherein
1, c
2The frequency that control is revised, Δ SNR
1, Δ SNR
2The degree that control is revised;
Step 1050 is revised step-length according to the SNR that obtains in SNR that estimates in the step 1010 and the step 1040 SNR that estimates in the step 1010 is revised;
The SNR that the SNR that revises equals to estimate deducts the correction step-length;
Step 1060 judges whether this ability classification that receives HS-DSCH only supports QPSK, if forward step 1070 to; Otherwise forward step 1080 to;
Step 1070 selects QPSK as the RMF that reports;
Step 1080, the SNR of more revised SNR and modulation system switching point if revised SNR more than or equal to the SNR of switching point, then selects 16QAM as the RMF that reports, otherwise selects QPSK as the RMF that reports;
Step 1090 is searched the CQI table, finds the SNR smaller or equal to the value maximum of the SNR that revises, utilizes the equivalent code check of its correspondence to calculate transmission block size TB size;
Here it should be noted that if the SNR that revises less than the SNR of CQI form intermediate value minimum, selects the equivalent code check of the SNR correspondence of CQI form intermediate value minimum to calculate transmission block size TBsize so;
Step 1100, search the transmission block size TB size of HS-DSCH classification correspondence of this reception and the mapping table of transmitting block index TB index, find the pairing TB index of maximum TB size, be the RTBS that reports smaller or equal to the transmission block size that obtains in the step 1090;
Here it should be noted that if the TB size that obtains in the step 1090 less than TB size minimum in the TB size mapping table of HS-DSCH classification correspondence, selects the TBindex of minimum TB size correspondence as the RTBS that reports so.
Second embodiment that the present invention proposes proofreaies and correct about realize CQI by the transmitting block index correction, as shown in Figure 6, comprises the steps:
Step 2000 is carried out initialization operation, mainly comprises: the crc error counter puts 0;
Initialization operation is only done once when the professional initiation of HSDPA;
Here need to add up the respectively signal power and the noise power of each time slot in TTI of HS-DSCH are divided by both then and are tried to achieve the average SNR of estimation, are above-mentioned received signal to noise ratio;
Step 2020 is carried out transmission channel processing and CRC and is detected;
Transmission channel is handled, and comprising: constellation separates rearrangement, deinterleaving, bit descrambling, separate bit merges, separates rate-matched (twice), Turbo decoding or the like processing procedure;
C wherein
1, c
2The frequency that control is revised, Δ mdex
1, index
2The degree that control is revised;
Step 2060 selects QPSK as the initial modulation system that reports;
Step 2070, the SNR that estimates in the comparison step 2010 and the SNR of modulation system switching point if the SNR that estimates then selects 16QAM as initial modulation system more than or equal to the SNR of switching point, otherwise select the modulation system of QPSK as primary election;
Step 2080 is searched the CQI table, finds the SNR smaller or equal to the SNR intermediate value maximum of estimating, utilizes the equivalent code check of its correspondence to calculate transmission block size TB size;
Here it should be noted that if the SNR that estimates less than the SNR of CQI form intermediate value minimum, selects the equivalent code check of the SNR correspondence of CQI form intermediate value minimum to calculate transmission block size TBsize so;
Step 2090 is searched the TB size of HS-DSCH classification correspondence of this reception and the mapping table of TB index, finds smaller or equal to the pairing TB index of the maximum TB size of the transmission block size that obtains in the step 2080 as initial TB index;
Here it should be noted that if the TB size that calculates less than minimum TB size in the corresponding TB size of the HS-DSCH classification mapping table, the TBindex that selects minimum TB size correspondence in the mapping table so is as initial TB index;
Step 2100 is revised step-length according to the TB index that obtains in initial TB index that obtains in the step 2090 and the step 2040 initial TB index is revised, and the TB index of correction equals initial TB index and deducts the correction step-length;
Step 2120, directly with the initial modulation mode as RMF, revised TB index reports as RTBS;
Step 2140 selects QPSK to report as RMF, and selects to use in the CQI form maximal rate of QPSK to calculate transmission block size TB size;
Perhaps, can select suitable equivalent code check to calculate transmission block size TB size according to the difference between the equivalent code check of equivalent code check that calculates in the step 2130 and switching point;
Step 2150 is searched the TB size of HS-DSCH classification correspondence of this reception and the mapping table of TB index, finds the pairing TB index of maximum TB size smaller or equal to the transmission block size that obtains in the step 2140 to report as RTBS;
Here it should be noted that if the TB size that calculates less than minimum TB size in the corresponding TB size of the HS-DSCH classification mapping table, selects the TBindex of minimum TB size correspondence in the mapping table to report as RTBS so.
Need to prove:
(1) revision level of two grades is that the compromise of performance and complexity is chosen in the embodiment of the invention, but the present invention is not limited to this two revision levels;
(2) CQI revise in the intact back of CRC check by relatively, table look-up and revise, this can bring certain time-delay to system handles, but this some time-delay is that system is sustainable;
(3) the not concrete definite method that limits several thresholdings among the present invention, its specific implementation can obtain by emulation;
(4) although adopted two kinds of modification methods among the present invention, the correction that no matter is based on SNR also is based on the correction of TB_index, finally all sums up in the point that the correction to transmission block size and modulation system.
As shown in Figure 7, the structure chart for the means for correcting of channel quality indication (CQI) comprises: information acquisition module 1 and correcting module 2, wherein,
Described information acquisition module 1, be used to obtain the received signal to noise ratio of estimating (SNR), through after the processing of transmission channel, carry out the number that CRC (CRC) detected and added up crc error, described SNR and crc error number are sent to described correcting module;
Described correcting module 2 is used for counting the described SNR of correction according to described crc error, determines the recommendation modulation system (RMF) that reports and recommends transmission block size (RTBS) according to revised SNR; Perhaps, obtain initial transmitting block index, count the described transmitting block index of correction according to described crc error again, determine the RMF and the RTBS that report according to revised transmitting block index according to described SNR.
Its operating process with aforesaid method is corresponding, and weak point is not given unnecessary details at this one by one with reference to the narration of said method part.
In sum, the difference between the present invention and the prior art is to finish correction to transmission block size and modulation system based on the correction of the correction of SNR or TB_index as can be known, can solve the existing in prior technology problem by this technological means.Compared with prior art, adopt the method for the invention that following advantage is arranged:
(1) by the crc error number of statistics HS-DSCH, the information of channel is revised CQI as prior information in good time before having utilized, and has improved the accuracy and the real-time that report CQI.
(2) revision level and the correction degree of two grades of employing further guarantee the accuracy of CQI, and are convenient to flexible control;
(3) simplicity of design is convenient to realize.
Though the disclosed execution mode of the present invention as above, yet described content is not in order to direct qualification protection scope of the present invention.Any the technical staff in the technical field of the invention under the prerequisite that does not break away from the disclosed spirit and scope of the present invention, can do a little change what implement in form and on the details.Protection scope of the present invention still must be as the criterion with the scope that appending claims was defined.
Claims (10)
1. the bearing calibration of a channel quality indication (CQI) is characterized in that,
Obtain the received signal to noise ratio of estimating (SNR),, carry out the number that CRC (CRC) detected and added up crc error through after the processing of transmission channel;
Count the described SNR of correction according to described crc error, determine the recommendation modulation system (RMF) that reports and recommend transmission block size (RTBS) according to revised SNR; Perhaps, obtain initial transmitting block index, count the described transmitting block index of correction according to described crc error again, determine the RMF and the RTBS that report according to revised transmitting block index according to described SNR.
2. the method for claim 1 is characterized in that,
Count the described SNR of correction according to described crc error, determine the RMF that reports according to revised SNR, and show to obtain corresponding equivalent code check according to revised SNR inquiry CQI and determine the transmission block size, and obtain corresponding transmitting block index, the RTBS of transmission block size for reporting of this transmitting block index correspondence by the inquiry of the size of described transmission block.
3. method as claimed in claim 2 is characterized in that,
If high-speed downlink shared channel (HS-DSCH) classification is only supported quarternary phase-shift keying (QPSK) signal (QPSK) modulation system, the then RMF that directly selects the QPSK modulation system to report as CQI; Otherwise whether more described revised SNR more than or equal to the SNR of modulation system switching point, if, the RMF that adopts 16 quadrature amplitude modulation (16QAM) modulation system to report as CQI; Otherwise, the RMF that adopts the QPSK modulation system to report as CQI.
4. method as claimed in claim 2 is characterized in that,
Search CQI table according to revised SNR, find in the CQI table SNR, utilize the equivalent code check of its correspondence to calculate transmission block size (TB size) less than the value maximum of the SNR that equals to revise; Search the TB size of HS-DSCH classification correspondence of this reception and the mapping table of transmitting block index according to described TB size, find the pairing transmitting block index of transmission block smaller or equal to the value maximum of described TB size as the RTBS that reports;
If the SNR that revises less than the SNR of CQI form intermediate value minimum, then selects the equivalent code check of the SNR correspondence of CQI form intermediate value minimum to calculate transmission block size TB size; If described TB size less than TB size minimum in the TB size mapping table of HS-DSCH classification correspondence, selects the transmitting block index of minimum TB size correspondence as the RTBS that reports so.
5. method as claimed in claim 1 or 2 is characterized in that,
If the crc error number is greater than first thresholding, the correction step-length of SNR is made as first correction value; If the crc error number is smaller or equal to first thresholding and greater than second thresholding, the correction step-length of SNR is made as second correction value, if the crc error number smaller or equal to second thresholding, is made as 0 with the correction step-length of SNR; The SNR that revises equals described SNR and deducts described correction step-length.
6. the method for claim 1 is characterized in that,
Obtain corresponding equivalent code check according to described SNR inquiry CQI table and determine the transmission block size, and obtain initial transmitting block index by the size of described transmission block, count the described initial transmitting block index of correction according to described crc error again, determine the RMF and the RTBS that report according to revised transmitting block index.
7. method as claimed in claim 6 is characterized in that,
If the ability grade of user terminal is only supported the QPSK modulation system, the direct RMF that selects the QPSK modulation system to report as CQI, otherwise, whether more described SNR is more than or equal to the SNR of modulation system switching point, if, adopting the 16QAM modulation system is the initial modulation mode, otherwise adopting the QPSK modulation system is the initial modulation mode.
8. method as claimed in claim 6 is characterized in that,
When the initial modulation mode is the QPSK modulation system, the RMF that directly selects the QPSK modulation system to report as CQI; When the initial modulation mode is the 16QAM modulation system, calculate the equivalent code check of revised transmitting block index, and relatively its whether more than or equal to the equivalent code check of modulation system switching point, if, then the 16QAM modulation system is the RMF that CQI reports, and the index of revised transmission block size is the RTBS that CQI reports; Otherwise, the QPSK modulation system is the RMF that CQI reports, use the maximum equivalent code check of QPSK to calculate the RTBS that CQI reports in the CQI form, perhaps select suitable equivalent code check to calculate the RTBS that CQI reports according to the difference size of the equivalent code check of the equivalent code check of revised transmitting block index and modulation system switching point.
9. as claim 1 or 6 described methods, it is characterized in that,
If the crc error number is greater than first thresholding, the correction step-length of transmitting block index is made as first correction value; If the crc error number is smaller or equal to first thresholding and greater than second thresholding, the correction step-length of transmitting block index is made as second correction value, if the crc error number smaller or equal to second thresholding, is made as 0 with the correction step-length of transmitting block index; The transmitting block index of revising equals described initial transmitting block index and deducts described correction step-length.
10. the means for correcting of a channel quality indication (CQI) is characterized in that, comprising: information acquisition module and correcting module, wherein,
Described information acquisition module is used to obtain the received signal to noise ratio of estimating (SNR), through after the processing of transmission channel, carries out the number that CRC (CRC) detected and added up crc error, and described SNR and crc error number are sent to described correcting module;
Described correcting module is used for counting the described SNR of correction according to described crc error, determines the recommendation modulation system (RMF) that reports and recommends transmission block size (RTBS) according to revised SNR; Perhaps, obtain initial transmitting block index, count the described transmitting block index of correction according to described crc error again, determine the RMF and the RTBS that report according to revised transmitting block index according to described SNR.
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| CN102299773A (en) * | 2011-09-21 | 2011-12-28 | 慈溪市供电局 | Adaptive modulation coding method for time division multiple access (TDMA) system and mobile terminal |
| CN102882653A (en) * | 2012-10-15 | 2013-01-16 | 华为技术有限公司 | Channel quality indicator reporting method and user equipment |
| CN102904670A (en) * | 2012-03-31 | 2013-01-30 | 展讯通信（上海）有限公司 | Device and method for obtaining channel quality indicator, mobile terminal and communication system |
| WO2013097196A1 (en) * | 2011-12-30 | 2013-07-04 | 京信通信系统（中国）有限公司 | Method, device and system for detecting transmission link |
| CN103369580A (en) * | 2012-03-31 | 2013-10-23 | 展讯通信（上海）有限公司 | Method and device for carrying out system-level simulation on wireless channel transmission at terminal side |
| CN103419199A (en) * | 2013-07-09 | 2013-12-04 | 天津大学 | Teaching system based on open type welding robot |
| WO2014139159A1 (en) * | 2013-03-15 | 2014-09-18 | Qualcomm Incorporated | Predicting channel state |
| CN106982172A (en) * | 2016-01-18 | 2017-07-25 | 华为技术有限公司 | Determine the method and communication equipment of polarization code transport block size |
| CN107465484A (en) * | 2016-06-03 | 2017-12-12 | 大唐移动通信设备有限公司 | A kind of Adaptive Modulation and Coding AMC methods of adjustment and system |
| CN109660265A (en) * | 2018-12-14 | 2019-04-19 | 山东大学 | A kind of adaptive dual binary turbo code coding/decoding method based on DVB-RCS standard |
| CN111245737A (en) * | 2020-01-09 | 2020-06-05 | 重庆邮电大学 | Method for selecting size of transmission data block in Internet of things system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102299773A (en) * | 2011-09-21 | 2011-12-28 | 慈溪市供电局 | Adaptive modulation coding method for time division multiple access (TDMA) system and mobile terminal |
| WO2013097196A1 (en) * | 2011-12-30 | 2013-07-04 | 京信通信系统（中国）有限公司 | Method, device and system for detecting transmission link |
| CN102904670B (en) * | 2012-03-31 | 2015-03-18 | 展讯通信（上海）有限公司 | Device and method for obtaining channel quality indicator, mobile terminal and communication system |
| CN103369580B (en) * | 2012-03-31 | 2016-03-02 | 展讯通信（上海）有限公司 | In end side, the method and apparatus of system integration project is carried out to wireless channel transmission |
| CN102904670A (en) * | 2012-03-31 | 2013-01-30 | 展讯通信（上海）有限公司 | Device and method for obtaining channel quality indicator, mobile terminal and communication system |
| CN103369580A (en) * | 2012-03-31 | 2013-10-23 | 展讯通信（上海）有限公司 | Method and device for carrying out system-level simulation on wireless channel transmission at terminal side |
| CN102882653B (en) * | 2012-10-15 | 2015-04-29 | 华为技术有限公司 | Channel quality indicator reporting method and user equipment |
| CN102882653A (en) * | 2012-10-15 | 2013-01-16 | 华为技术有限公司 | Channel quality indicator reporting method and user equipment |
| WO2014139159A1 (en) * | 2013-03-15 | 2014-09-18 | Qualcomm Incorporated | Predicting channel state |
| US9961575B2 (en) | 2013-03-15 | 2018-05-01 | Qualcomm Incorporated | Predicting channel state |
| CN103419199A (en) * | 2013-07-09 | 2013-12-04 | 天津大学 | Teaching system based on open type welding robot |
| CN106982172A (en) * | 2016-01-18 | 2017-07-25 | 华为技术有限公司 | Determine the method and communication equipment of polarization code transport block size |
| WO2017124844A1 (en) * | 2016-01-18 | 2017-07-27 | 华为技术有限公司 | Method for determining transmission block size of polarisation code, and communication device |
| CN106982172B (en) * | 2016-01-18 | 2020-04-28 | 华为技术有限公司 | Method and communication device for determining size of transmission block of polarization code |
| CN107465484A (en) * | 2016-06-03 | 2017-12-12 | 大唐移动通信设备有限公司 | A kind of Adaptive Modulation and Coding AMC methods of adjustment and system |
| CN107465484B (en) * | 2016-06-03 | 2019-11-22 | 大唐移动通信设备有限公司 | A kind of Adaptive Modulation and Coding AMC method of adjustment and system |
| CN109660265A (en) * | 2018-12-14 | 2019-04-19 | 山东大学 | A kind of adaptive dual binary turbo code coding/decoding method based on DVB-RCS standard |
| CN109660265B (en) * | 2018-12-14 | 2021-08-31 | 山东大学 | Self-adaptive dual-binary Turbo code encoding and decoding method based on DVB-RCS standard |
| CN111245737A (en) * | 2020-01-09 | 2020-06-05 | 重庆邮电大学 | Method for selecting size of transmission data block in Internet of things system |
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Application publication date: 20110622 |