CN101621829A - Method and device for reporting channel quality indicator - Google Patents
Method and device for reporting channel quality indicator Download PDFInfo
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- CN101621829A CN101621829A CN200910089890A CN200910089890A CN101621829A CN 101621829 A CN101621829 A CN 101621829A CN 200910089890 A CN200910089890 A CN 200910089890A CN 200910089890 A CN200910089890 A CN 200910089890A CN 101621829 A CN101621829 A CN 101621829A
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Abstract
The invention discloses a method and a device for reporting a channel quality indicator (CQI). The method comprises the following steps: obtaining the current channel quality of a channel to be measured and calculating the code rate value of the channel to be measured and the index value of a transmission block according to the current channel quality; reducing the index value of the transmission block when the code rate value is larger than a code rate critical value and the circular redundancy correction (CRC) error amount of a user terminal in a first preset receiving window is larger than or equal to a first preset limit value so as to obtain an index adjusting value of the transmission block; and increasing the index value of the transmission block when the code rate value is larger than the code rate critical value, the CRC error amount of the user terminal in a second preset receiving window is smaller than or equal to a second preset limit value, and the second preset limit value is smaller than the first preset limit value so as to obtain the index adjusting value of the transmission block. The method and the device utilize the CRC as a standard to adjust the reporting value of the CQI so as to adjust errors with high error code rate, thereby being suitable for different channel environments and obtaining an optimized CQI reporting parameter.
Description
Technical field
The invention belongs to wireless communication technology field, be meant a kind of TD-HSDPA of being applied to (TimeDivision-High Speed Downlink Packages Access especially, the time-division-high speed downlink packet inserts) CQI (Channel Quality Indicator, CQI) report method and the device of technology.
Background technology
In order to adapt to the multimedia service needs growing to high speed data transfer, 3G (Third Generation) Moblie collaborative project group (3GPP) has been announced a kind of new high speed data transfer technology-HSDPA technology, and this HSDPA technology is strengthened the function of downlink transmission greatly.HSDPA has the characteristics of high speed data transfer and large user's capacity, it is by implementing some quick and complicated channel controlling mechanisms, comprise the short frame of physical layer, AMC (adaptive modulation and coding adaptive coding and modulating), the automatic retransmission technique (Hybrid-ARQ of rapid mixing, be called for short HARQ) and the fast dispatch technology, improved the experience that the end user uses the data download services, shortened and connect and the time of replying.
The HSDPA process is briefly described as follows: the base station is at first by HS-SCCH (High Speed-SharedControl Channel, High-Speed Shared Control Channel) notice UE (User Equipment, subscriber equipment) corresponding HS-DSCH (High Speed-Downlink Shared Channel, high-speed downlink shared channel) information, comprise user ID, HS-PDSCH (High Speed-Physical Downlink SharedChannel, High-Speed Physical Downlink Shared Channel) code channel resource, modulation system etc.Be separated by then behind the preset time, on HS-DSCH, send data.UE then monitors HS-SCCH, by the identification user ID, judges that whether this time information is to oneself.If then the information of carrying according to HS-SCCH receives and demodulation shared channel HS-DSCH, obtains data.According to the situation of measurement result and Data Receiving, transmit information then at HS-SICH.The base station is according to feedback, can determine data retransmission whether and modulation and coded system that can adaptive adjustment shared channel.
In order to realize top process, need terminal subsidiary channel circumstance and produce preferable CQI (Channel Quality Indicator according to channel circumstance, CQI) value reports the reference that conduct transmission next time in base station is selected the transmission block size, determined modulation system or data retransmission, so the CQI value of reporting is vital for the HSDPA systematic function.
In existing HSDPA technology, the report method of CQI value is to calculate code check by measuring current channel quality, because code check has reflected the ratio of transport block length and shared physical code channel resource, therefore can associate channel quality and transmission block size by code check, by the code check value that obtains, calculate and obtain the transmitting block index value afterwards.
Yet the report method of the above-mentioned CQI value of prior art, the definite of transmitting block index value normally utilizes form to read acquisition, therefore it is not necessarily accurate to calculate the transmitting block index value that obtains, particularly better at channel condition, also promptly obtain under the code check conditions of higher, the transmitting block index value reports the too high or too low throughput that all can influence HSDPA reality, even if under identical channel condition, the transmit difference of performance of different base station also can influence the performance of HSDPA, the CQI value report method of therefore existing fixed form is difficult to accurately report optimum value, influences the reliability and the high efficiency of HSDPA business.
Summary of the invention
The method and the device that provide a kind of channel quality indicator CQI to report is provided the purpose of technical solution of the present invention, utilize cyclic redundancy check (CRC) to regulate the reporting channel quality indicator value for standard, regulate with error high code check, thereby adapt to different channel circumstances, obtain optimal CQI and report parameter.
To achieve the above object of the invention, the invention provides the method that a kind of channel quality indicator CQI reports, be applied to the time division high speed downlink grouping and insert the TD-HSDPA system, described method comprises:
Obtain the current channel quality of channel to be measured,, calculate the code check value and the transmitting block index value of described channel to be measured according to described current channel quality;
Described code check value when the cyclic redundancy check (CRC) error number of user side in the first default receiver window preset limit value more than or equal to first, is turned down described transmitting block index value greater than a code check critical value, obtains the transmitting block index adjusted value;
Described code check value is greater than described code check critical value, the described crc error number of described user side in the second default receiver window is less than or equal to the second default limit value, and when the described second default limit value is preset limit value less than described first, heighten described transmitting block index value, obtain described transmitting block index adjusted value.
Preferably, above-mentioned described method, described method also comprises:
Described code check value is greater than described code check critical value, when the described crc error number of described user side in the second default receiver window preset limit value less than the described first default limit value greater than described second, do not change described transmitting block index value, with described transmitting block index value as described transmitting block index adjusted value.
Preferably, above-mentioned described method, described method also comprises:
Judge described transmitting block index adjusted value whether greater than the transmitting block index maximum of a default maximal rate correspondence, if judged result is for being, then with described transmitting block index maximum as best transmission piece index value; If judged result is not for, then with described transmitting block index adjusted value as described best transmission piece index value.
Preferably, above-mentioned described method, described method also comprises:
Obtain the current transmitting block index apportioning cost that the base station sends, whether the difference that last time reports the transmitting block index value of judging described current transmitting block index apportioning cost and described user side is greater than a predetermined threshold value, if judged result is for being then described best transmission piece index value to be added that an offset is as the current transmitting block index value that reports; If judged result is not for, then with described best transmission piece index value as the described current transmitting block index value that reports.
Preferably, above-mentioned described method, the described second default receiver window is equal to or less than the described first default receiver window.
Preferably, above-mentioned described method, the described second default limit value is zero.
Preferably, above-mentioned described method, describedly turn down described transmitting block index value, the step that obtains described transmitting block index adjusted value specifically comprises: improve transmitting block index and adjust step-length, transmitting block index was adjusted step-length and is obtained described transmitting block index adjusted value after described transmitting block index value deducted and improves.
Preferably, above-mentioned described method, describedly heighten described transmitting block index value, the step that obtains described transmitting block index adjusted value specifically comprises: reduce transmitting block index and adjust step-length, described transmitting block index value adds that reducing back transmitting block index adjustment step-length obtains described transmitting block index adjusted value.
The device that the present invention also provides a kind of channel quality indicator CQI to report on the other hand is applied to the time division high speed downlink grouping and inserts the TD-HSDPA system, and described device comprises:
The primary Calculation unit is used to obtain the current channel quality of channel to be measured, according to described current channel quality, calculates the code check value and the transmitting block index value of described channel to be measured;
First judging unit is used to judge that whether described code check value is greater than a code check critical value;
Transmitting block index value adjustment unit, be used for, when described code check value greater than a code check critical value, the cyclic redundancy check (CRC) error number of user side in the first default receiver window is during more than or equal to the first default limit value, turn down described transmitting block index value, obtain the transmitting block index adjusted value; And work as described code check value greater than described code check critical value, the described crc error number of described user side in the second default receiver window is less than or equal to the second default limit value, and when the described second default limit value is preset limit value less than described first, heighten described transmitting block index value, obtain described transmitting block index adjusted value.
Preferably, above-mentioned described device, described device also comprises:
Second judging unit is used to judge described transmitting block index adjusted value whether greater than the transmitting block index maximum of a default maximal rate correspondence, if judged result is for being, then with described transmitting block index maximum as best transmission piece index value; If judged result is not for, then with described transmitting block index adjusted value as described best transmission piece index value.
Preferably, above-mentioned described device, described device also comprises:
The 3rd judging unit, whether the difference that last time reports the transmitting block index value that is used to judge current transmitting block index apportioning cost that the base station sends and described user side is greater than a predetermined threshold value, if judged result is for being then described best transmission piece index value to be added that an offset is as the current transmitting block index value that reports; If judged result is not for, then with described best transmission piece index value as the described current transmitting block index value that reports.
In the technique scheme at least one has following beneficial effect:
The described method and apparatus of the specific embodiment of the invention calculates in prior art on the basis of CQI value, has increased the standard that CRC selects as transmission block, can finely tune to adapt to various environment the error of high code check;
Respectively adopt two kinds of different window length to realize for the regularization condition that increases or reduce the transmitting block index value, can guarantee to receive the Block Error Rate (BLER) of HS-DSCH, can guarantee the throughput-maximized of system again;
Increase the maximal rate thresholding and guaranteed not exceed when transmission block adjusts upward the ability of receiver, also the step-length according to the base station downward modulation compensates the transmitting block index value that reports, therefore can descend optimum modulation system and code efficiency by this channel circumstance of Dynamic Selection, thereby obtain maximum throughput, improve the utilance of system.
Description of drawings
Fig. 1 is the schematic flow sheet of the preliminary algorithm of CQI in the described method of the specific embodiment of the invention;
Fig. 2 adjusts the schematic flow sheet of CQI value according to CRC result for the described method of the specific embodiment of the invention;
Fig. 3 is the wherein schematic flow sheet of an embodiment of the method for the invention;
Fig. 4 is the structural representation of device of the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the accompanying drawings and the specific embodiments.
Method that channel quality indicator CQI of the present invention reports and device, pass through the measured channel environmental quality at the prior art user terminal, determine under the basis of code check, transmission block size and transmitting block index value, also increased the standard of CRC as fine setting transmitting block index value, can regulate the error under the high code check channel circumstance, to adapt to various environment; In addition, for preventing to finely tune the maximum capacity that the code check that improves the back exceeds the demodulation of the actual energy of receiver, also the transmission block corresponding code rate is carried out the maximal rate restriction,, improve the reliability and the high efficiency of HSDPA business so that user terminal feeds back preferable CQI value to the base station.
The method that CQI of the present invention reports mainly comprises following two steps:
Step 1 obtains the current channel quality of channel to be measured, according to described current channel quality, calculates the code check value and the transmitting block index value of described channel to be measured;
Step 2 according to the error number of the cyclic redundancy check (CRC) in the default receiver window of user side, is adjusted described transmitting block index value, obtains the transmitting block index adjusted value.
According to current channel quality, primary Calculation CQI value comprises code check value, modulation system, transmission block magnitude numerical value and transmitting block index value by step 1; Utilize the standard of CRC by step 2, to obtain the optimum value of reporting as fine setting transmitting block index value.
Below will the process of above-mentioned steps one and step 2 be elaborated.
As Fig. 1 is the schematic flow sheet of the preliminary algorithm of CQI in the method as described in the specific embodiment of the invention, consults Fig. 1, carries out the CQI primary Calculation and comprises step:
S101 obtains the current channel quality of channel to be measured;
S102 according to described current channel quality, determines the modulation system of current channel, and searches from rate tables and described current channel quality corresponding code rate value, and this rate tables is to set up according to the mapping relations between code check and the channel quality;
S103 according to the physical resource of described code check value and base station assigns, calculates and obtains the transmission block size estimation; And, from the transmission block table, read the transmitting block index value of current channel quality according to described transmission block size estimation.
It will be understood by those skilled in the art that and utilize above-mentioned step S101 to S103, can primary Calculation obtain the CQI reported result.
As Fig. 2 be the method for the invention according to CRC result, S201 to S203 obtains the schematic flow sheet that the transmitting block index value is adjusted to above-mentioned steps, consults Fig. 2, this adjustment process comprises from step S201:
Step S202, initialization is so that transmitting block index is adjusted step-length and the initialization of Data Receiving statistic window and made each counter O reset;
Step S203, whether the code check value that the CQI initial calculation obtains among the determining step S101 to S103 is during more than or equal to a code check critical value, and this code check critical value is the numerical value more than or equal to 0.8, it will be appreciated by those skilled in the art that, when code check more than or equal to 0.8 the time, channel condition is better;
If judged result is for being then downward execution in step S204;
If judged result is not, then downward execution in step S208 jumps out this adjustment process;
Step S204, the crc error number in the statistics receiver window;
When the crc error number is preset limit value more than or equal to one first in the first default receiver window, then downward execution in step S205;
The crc error number is less than or equal to one second when presetting limit value in the second default receiver window is long, then downward execution in step S206, wherein this second default limit value is less than this first default limit value, and this second default receiver window is grown up long in this first default receiver window;
When described crc error number in the second default receiver window is preset limit value less than the described first default limit value and greater than described second, then downward execution in step S207;
Step S205, turn down the transmitting block index value, also promptly improve transmitting block index and adjust step-length, the transmitting block index value that described step S103 is obtained deducts and improves the back transmitting block index and adjust step-length and obtain described transmitting block index adjusted value, simultaneously the reception data window of zero clearing counter and current downward adjustment;
Step S206, heighten the transmitting block index value, also promptly reduce transmitting block index and adjust step-length, the transmitting block index value that described step S103 is obtained adds that reducing back transmitting block index adjustment step-length obtains described transmitting block index adjusted value, simultaneously zero clearing counter and the current reception data window that adjusts upward;
Step S207 does not change described transmitting block index value, with former described transmitting block index value as described transmitting block index adjusted value, simultaneously zero clearing counter and current reception data window;
Step S208 adjusts the process of CQI value and carries out end.
By the described method of the specific embodiment of the invention, when utilizing CRC result to adjust the CQI value, adopt the different crc error threshold values of two kinds of different receiver windows long (also promptly the first default receiver window is long long with the second default receiver window) (i.e. the first default limit value and the second default limit value) to judge respectively for the condition that increases or reduce the transmitting block index value with two kinds, throughput-maximized in order to the Block Error Rate (BLER) that guarantee to receive HS-DSCH and system.
In the statistics receiver window in the process of crc error number, when the crc error number has reached the first default limit value, but the long no show of the first default receiver window, when promptly the data in the first default receiver window are not also filled up, the also downward execution in step S205 of program promptly carries out and adjusts transmitting block index value step downwards.And carry out upwards or when not adjusting transmitting block index value step, then need the data of the second default receiver window in long to fill up, according to the crc error number that fills up data, judgement adjusts upward or does not adjust the transmitting block index value.
In addition, it will be understood by those skilled in the art that when utilizing CRC result to adjust the CQI value, also can adopt same receiver window length to judge for increasing or reduce the transmitting block index value, and the second default limit value can be zero for condition.Also promptly when crc error number in the first default receiver window during more than or equal to the first default limit value, execution in step S205, reduction transmitting block index value; When the crc error number was zero in the first default receiver window is long, then downward execution in step S206 increased the transmitting block index value; When described crc error number was preset limit value less than described first in the first default receiver window is long, then downward execution in step S207 did not change the transmitting block index value.
As Fig. 3 is the schematic flow sheet of the method for the invention first embodiment, in this first embodiment, the code check that described method also reports CQI carries out the maximal rate restriction, to prevent that the code check of finely tuning raising from exceeding the ability of the actual energy of receiver demodulation, and work as timing under the transmitting block index value of base station assigns, add when reporting the transmitting block index value that an offset reports by way of compensation.
Consult Fig. 3, concrete, the method for the invention first embodiment comprises:
Step S301, current channel quality according to channel to be measured between the transmitter and receiver, primary Calculation CQI value comprises and determines optimum code check value, modulation system and determine best transmission block size and transmitting block index value according to code check, also is the implementation of Fig. 1 steps flow chart;
Whether step S302 judges described code check value greater than a code check critical value, if judged result is for being, execution in step S303 downwards then, if judged result is not for, then with described transmitting block index value as current transmitting block index value of reporting, downward execution in step S310;
Step S303 according to the error number of the cyclic redundancy check (CRC) in the default receiver window of user side, adjusts described transmitting block index value, obtains the transmitting block index adjusted value;
Above-mentioned step S302 and S303, be used for adjusting the transmitting block index value according to CRC result, also be the implementation of Fig. 2 steps flow chart, on the transmitting block index value basis that step S301 produces according to the CQI table, utilize CRC to finely tune to reach the effect of the maximum HSDPA of raising throughput;
Step S304 judges described transmitting block index adjusted value whether greater than the transmitting block index maximum of a default maximal rate correspondence, if judged result is for being, and execution in step S305 downwards then, if judged result is not for, then downward execution in step S306;
Step S305, with described transmitting block index maximum as best transmission piece index value;
Step S306, with described transmitting block index adjusted value as described best transmission piece index value;
Above-mentioned step S304 to S306 is used for transmitting block index value corresponding code rate is carried out the maximal rate restriction, exceeds the ability of the actual energy of receiver demodulation to prevent the code check of finely tuning raising, thereby causes data transmission fails, causes the decline rapidly of throughput.
Above-mentioned steps S301 to S306 by the described method of the specific embodiment of the invention, can regulate the error under the high code check channel circumstance, adapting to variant environment, and reach and prevent to finely tune the effect that the code check that improves the back exceeds receiver actual demodulation maximum capacity.
In addition, when determining that according to the sequential relationship of HS-SICH and HS-SCCH base station downward modulation user side reports the transmitting block index value, the described method of the specific embodiment of the invention is also according to the step-length of the transmitting block index value of base station downward modulation, obtain numerical value as the transmitting block index value of reporting with regulating after the best transmission piece index value that obtains adds an offset, be used to compensate the base station and adjust excessive numerical value for the transmitting block index apportioning cost.Particularly, the described method of the specific embodiment of the invention is passed through step S307 to step S309 realization said process;
Described step S307, obtain the current transmitting block index apportioning cost that the base station sends, whether the difference that last time reports the transmitting block index value of judging described current transmitting block index apportioning cost and described user side is greater than a predetermined threshold value, if judged result is for being, then downward execution in step S308, if judged result denys then downward execution in step S309;
Described step S308 adds that with described best transmission piece index value an offset is as the current transmitting block index value that reports;
Described step S309, then with described best transmission piece index value as the described current transmitting block index value that reports;
At last at step S310, to the base station report described current report the transmitting block index value and with the described current corresponding current code check value that reports of transmitting block index value that reports.
More than comprehensive,, utilize CRC result to adjust the CQI value, can make terminal feed back preferable CQI message and give the base station by the described method of the specific embodiment of the invention; In addition, for improving the throughput of HSDPA, in the described method of the specific embodiment of the invention, comprise further that also qualification reports maximal rate according to receiver actual reception ability, and regulate the current process that reports the transmitting block index value according to the transmitting block index value of base station assigns, with the reliability and the high efficiency of further raising HSDPA business.
The device that the present invention also provides a kind of channel quality indicator CQI to report on the other hand is applied to time division high speed downlink packet access technique TD-HSDPA system, and Fig. 4 is the structural representation of described device, consults Fig. 4, and described device 10 comprises:
Primary Calculation unit 11 is used to obtain the current channel quality of channel to be measured, according to described current channel quality, calculates the code check value and the transmitting block index value of described channel to be measured;
First judging unit 12 is used to judge that whether described code check value is greater than a code check critical value;
Transmitting block index value adjustment unit 13, be used for, when described code check value greater than a code check critical value, judge when the cyclic redundancy check (CRC) error number of user side in the first default receiver window preset limit value more than or equal to first, turn down described transmitting block index value, obtain the transmitting block index adjusted value; And work as described code check value greater than described code check critical value, judge that the described crc error number of described user side in the second default receiver window is less than or equal to the second default limit value, and when the described second default limit value is preset limit value less than described first, heighten described transmitting block index value, obtain described transmitting block index adjusted value.
In addition, described device 10 also comprises:
Second judging unit 14 is used to judge described transmitting block index adjusted value whether greater than the transmitting block index maximum of a default maximal rate correspondence, if judged result is for being, then with described transmitting block index maximum as best transmission piece index value; If judged result is not for, then with described transmitting block index adjusted value as described best transmission piece index value;
The 3rd judging unit 15, whether the difference that last time reports the transmitting block index value that is used to judge current transmitting block index apportioning cost that the base station sends and described user side is greater than a predetermined threshold value, if judged result is for being then described best transmission piece index value to be added that an offset is as the current transmitting block index value that reports; If judged result is not for, then with described best transmission piece index value as the described current transmitting block index value that reports;
CQI value output unit 16 is used for reporting to the base station calculate obtaining the CQI value, comprise described current report transmitting block index value, modulation system and with described current transmitting block index value corresponding code rate, the transport block data size etc. of reporting.
Device of the present invention, calculate in prior art on the basis of CQI value, increased the standard that CRC selects as transmission block, can finely tune to adapt to various environment the error of high code check, increase the maximal rate thresholding and guaranteed not exceed when transmission block adjusts upward the ability of receiver, also the step-length according to the base station downward modulation compensates the transmitting block index value that reports, therefore can descend optimum modulation system and code efficiency by this channel circumstance of Dynamic Selection, thereby obtain maximum throughput, improve the utilance of system.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (11)
1. the method that channel quality indicator CQI reports is applied to the time division high speed downlink grouping and inserts the TD-HSDPA system, it is characterized in that described method comprises:
Obtain the current channel quality of channel to be measured,, calculate the code check value and the transmitting block index value of described channel to be measured according to described current channel quality;
Described code check value when the cyclic redundancy check (CRC) error number of user side in the first default receiver window preset limit value more than or equal to first, is turned down described transmitting block index value greater than a code check critical value, obtains the transmitting block index adjusted value;
Described code check value is greater than described code check critical value, the described crc error number of described user side in the second default receiver window is less than or equal to the second default limit value, and when the described second default limit value is preset limit value less than described first, heighten described transmitting block index value, obtain described transmitting block index adjusted value.
2. the method for claim 1 is characterized in that, described method also comprises:
Described code check value is greater than described code check critical value, when the described crc error number of described user side in the second default receiver window preset limit value less than the described first default limit value greater than described second, do not change described transmitting block index value, with described transmitting block index value as described transmitting block index adjusted value.
3. method as claimed in claim 2 is characterized in that, described method also comprises:
Judge described transmitting block index adjusted value whether greater than the transmitting block index maximum of a default maximal rate correspondence, if judged result is for being, then with described transmitting block index maximum as best transmission piece index value; If judged result is not for, then with described transmitting block index adjusted value as described best transmission piece index value.
4. method as claimed in claim 3 is characterized in that, described method also comprises:
Obtain the current transmitting block index apportioning cost that the base station sends, whether the difference that last time reports the transmitting block index value of judging described current transmitting block index apportioning cost and described user side is greater than a predetermined threshold value, if judged result is for being then described best transmission piece index value to be added that an offset is as the current transmitting block index value that reports; If judged result is not for, then with described best transmission piece index value as the described current transmitting block index value that reports.
5. method as claimed in claim 1 or 2 is characterized in that, the described second default receiver window is equal to or less than the described first default receiver window.
6. method as claimed in claim 1 or 2 is characterized in that, the described second default limit value is zero.
7. the method for claim 1 is characterized in that, describedly turns down described transmitting block index value, and the step that obtains described transmitting block index adjusted value specifically comprises:
Improve transmitting block index and adjust step-length, transmitting block index was adjusted step-length and is obtained described transmitting block index adjusted value after described transmitting block index value deducted and improves.
8. the method for claim 1 is characterized in that, describedly heightens described transmitting block index value, and the step that obtains described transmitting block index adjusted value specifically comprises:
Reduce transmitting block index and adjust step-length, described transmitting block index value adds that reducing back transmitting block index adjustment step-length obtains described transmitting block index adjusted value.
9. the device that channel quality indicator CQI reports is applied to the time division high speed downlink grouping and inserts the TD-HSDPA system, it is characterized in that described device comprises:
The primary Calculation unit is used to obtain the current channel quality of channel to be measured, according to described current channel quality, calculates the code check value and the transmitting block index value of described channel to be measured;
First judging unit is used to judge that whether described code check value is greater than a code check critical value;
Transmitting block index value adjustment unit, be used for, when described code check value greater than a code check critical value, the cyclic redundancy check (CRC) error number of user side in the first default receiver window is during more than or equal to the first default limit value, turn down described transmitting block index value, obtain the transmitting block index adjusted value; And work as described code check value greater than described code check critical value, the described crc error number of described user side in the second default receiver window is less than or equal to the second default limit value, and when the described second default limit value is preset limit value less than described first, heighten described transmitting block index value, obtain described transmitting block index adjusted value.
10. device as claimed in claim 9 is characterized in that, described device also comprises:
Second judging unit is used to judge described transmitting block index adjusted value whether greater than the transmitting block index maximum of a default maximal rate correspondence, if judged result is for being, then with described transmitting block index maximum as best transmission piece index value; If judged result is not for, then with described transmitting block index adjusted value as described best transmission piece index value.
11. device as claimed in claim 10 is characterized in that, described device also comprises:
The 3rd judging unit, whether the difference that last time reports the transmitting block index value that is used to judge current transmitting block index apportioning cost that the base station sends and described user side is greater than a predetermined threshold value, if judged result is for being then described best transmission piece index value to be added that an offset is as the current transmitting block index value that reports; If judged result is not for, then with described best transmission piece index value as the described current transmitting block index value that reports.
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