CN101521904A - Method and device for reporting channel quality indicator - Google Patents

Method and device for reporting channel quality indicator Download PDF

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CN101521904A
CN101521904A CN200910081063A CN200910081063A CN101521904A CN 101521904 A CN101521904 A CN 101521904A CN 200910081063 A CN200910081063 A CN 200910081063A CN 200910081063 A CN200910081063 A CN 200910081063A CN 101521904 A CN101521904 A CN 101521904A
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value
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signal interference
interference ratio
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CN101521904B (en
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李沛
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Beijing T3G Technology Co Ltd
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Beijing T3G Technology Co Ltd
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Abstract

The invention discloses a method and a device for reporting a channel quality indicator, applying to a TD-HSDPA system. The method comprises the steps: a current quality token value of the channel quality to be measured is obtained, the current quality token value is compared with a modulation mode threshold value to confirm an optimal modulation mode reported by the current CQI; an optimal code rate under the current quality token value is searched in a code rate table according to the current quality token value; the size estimating values of transmitting blocks are calculated according to the optimal code rate, a transmitting block index value is read from a transmitting block table according to the transmitting block size estimating values; the transmitting block index value is regulated according to the current demodulation data result, a comparison result of a current quality token value and the channel quality threshold value and/or a comparison result of the transmitting block index value and the last time CQI reporting index value and a transmitting block index input value reported by the current CQI is obtained; and the transmitting block index input value and the optimal modulation mode are output. The reporting process is simple and effective and can obtain the optimal CQI reporting parameters.

Description

A kind of method of reporting channel quality indicator and device
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, time-division-high speed downlink packet access technology) CQI (Channel Quality Indicator, CQI) report method and device thereof.
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 base station and selects the transmission block size, determines the reference of modulation system or data retransmission as transmission next time, so the CQI value of reporting is vital for the HSDPA systematic function.
In existing HSDPA technology, the report method of CQI value is by measuring the signal interference ratio of current channel quality, calculate and this signal interference ratio value corresponding code rate, 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 the index value that obtains transmission block afterwards.
Yet the report method of the above-mentioned CQI value of prior art, it is accurate inadequately also to exist code check computational process complexity, method to calculate, and makes CQI report numerical value can not reach optimum shortcoming, therefore influences the reliability and the high efficiency of HSDPA business.
Summary of the invention
The purpose of technical solution of the present invention is to provide a kind of method and device of reporting channel quality indicator, that adopts that described method and apparatus makes CQI in the HSDPA business reports process simple and effectively, and can obtain the parameter that reports of preferred channels quality indicator, to guarantee the reliability and the high efficiency of HSDPA business.
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 time division high speed downlink packet access technique TD-HSDPA system, described method comprises:
Obtain the current quality token value of channel quality to be measured, described current quality token value is signal interference ratio value and/or snr value, by described current quality token value and modulation system threshold value are compared, determines the best modulation system that current C QI reports;
According to described current quality token value, from rate tables, search the best code check under the described current quality token value, the code check in the described rate tables and channel quality, transmission block size are corresponding; According to described best code check, calculate and obtain the transmission block size estimation, and, from the transmission block table, read the transmitting block index value according to described transmission block size estimation;
Report the comparative result of index value according to the comparative result of the result of current demodulating data, described current quality token value and channel quality thresholds value and/or described transmitting block index value and CQI last time, regulate described transmitting block index value, obtain the transmitting block index input value that described current C QI reports;
Export described transmitting block index input value and described best modulation system.
Preferably, above-mentioned described method, described current quality token value are the signal interference ratio sir value of described channel quality to be measured, and the step that obtains described current quality token value comprises:
Obtain the signal interference ratio estimated value of described channel quality to be measured;
It is level and smooth and/or time slot is level and smooth that described signal interference ratio estimated value is carried out frame, obtains level and smooth signal interference ratio value, and setting described level and smooth signal interference ratio value is described current quality token value.
Preferably, above-mentioned described method, described current quality token value are the minimum value that the signal interference ratio sir value of described channel quality to be measured is compared with the signal to noise ratio snr value, and the step that obtains described current quality token value comprises:
Obtain the signal interference ratio estimated value of described channel quality to be measured, it is level and smooth and/or time slot is level and smooth that described signal interference ratio estimated value is carried out frame, obtains level and smooth signal interference ratio value;
Obtain the signal-to-noise ratio (SNR) estimation value of described channel quality to be measured, it is level and smooth that described signal-to-noise ratio (SNR) estimation value is carried out frame, obtains level and smooth snr value;
Described level and smooth signal interference ratio value and described level and smooth snr value compare, and select the minimum value of described level and smooth signal interference ratio value and described level and smooth snr value, and setting described minimum value is described current quality token value.
Preferably, above-mentioned described method, by described current quality token value and modulation system threshold value are compared, determine that the step of best modulation system specifically comprises:
Described current quality token value and modulation system are that the threshold value of 16 symbol quadrature-amplitude modulation QAM compares, judge that whether described current quality token value is the threshold value of 16QAM greater than described modulation system, if judged result is for being, then setting described best modulation system is 16QAM, if judged result is then set described best modulation system and is quadrature phase shift key QPSK modulation for not.
Preferably, above-mentioned described method, described rate tables are that emulation by experiment obtains.
Preferably, above-mentioned described method according to described transmission block size estimation, reads in the step of described transmitting block index value from described transmission block table, adopts the mode of downward peek value from described transmission block table.
Preferably, above-mentioned described method, described result according to current demodulating data, the step of regulating described transmitting block index value specifically comprises:
Obtain the result after the demodulation high-speed downlink shared channel HS-DSCH data, whether the transport block data of judging current demodulation is correct, if judged result is for being, then CQI last time report adopt to reduce on the basis of adjusting step-length and adjust step-length, obtain current adjustment step-length, if judged result then increases and adjusts step-length for not, obtain described current adjustment step-length;
According to described current adjustment step-length, described transmitting block index value is deducted described current adjustment step-length obtain to adjust back transmitting block index value.
Preferably, above-mentioned described method, report the comparative result of index value according to the comparative result of described current quality token value and described channel quality thresholds value and/or described transmitting block index value and CQI last time, the step of regulating described transmitting block index value specifically comprises:
Whether judge described current quality token value less than described channel quality thresholds value, if judged result is not, then setting described adjustment back transmitting block index value is described transmitting block index input value; If judged result is for being, judge further that then afterwards transmitting block index value and described last time CQI report the absolute value of difference of index value whether greater than an adjacent transmitting block index difference thresholding in described adjustment;
If the result of described further judgement is not, then setting described adjustment back transmitting block index value is described transmitting block index input value; If whether the result of described further judgement, then judges described last time CQI again for being and reports index value greater than the back transmitting block index value of described adjustment;
If the described result who judges again is for being, then setting described last time CQI, to report index value to deduct the numerical value that described adjacent transmitting block index threshold value obtains be described transmitting block index input value, to report index value to add the numerical value that the above adjacent transmitting block index threshold value obtained be described transmitting block index input value if the described result who judges again, then sets described last time CQI for not.
Preferably, above-mentioned described method to the described channel quality to be measured smoothing formula that level and smooth and/or time slot is level and smooth according to frame when obtaining described current signal interference ratio sir value is:
SIR m ‾ = Σ i = n m α i × SIR i
Wherein: when time slot is level and smooth, SIR iThe signal interference ratio sir measurement value of expression time slot i, α iThe smoothing factor of representing i business time-slot,
Figure A200910081063D00092
The signal interference ratio sir value of the level and smooth back frame of expression; When frame is level and smooth, SIR iThe signal interference ratio sir value of representing the i frame, α iThe smoothing factor of representing the i frame,
Figure A200910081063D00093
The level and smooth signal interference ratio sir value of expression multiframe.
Preferably, above-mentioned described method, the smoothing formula when described channel quality to be measured is obtained described current signal to noise ratio snr value according to frame is level and smooth is:
SNR m ‾ = Σ i = m - G m α i × SNR i
Wherein: SNR iThe signal to noise ratio snr measured value of representing the i frame,
Figure A200910081063D00095
The level and smooth signal to noise ratio snr value of representing the m frame, α iThe smoothing factor of representing the i frame, G are represented the sum of smoothed frame.
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 described device comprises:
Data processing module is used to obtain the current quality token value of channel quality to be measured, and described current quality token value is signal interference ratio value and/or snr value;
Modulation demodulation system is selected module, is used for determining the best modulation system that current C QI reports by described current quality token value and modulation system threshold value are compared;
Transmission block primary election module is used for according to described current quality token value, searches the best code check under the described current quality token value from rate tables, and the code check in the described rate tables and channel quality, transmission block size are corresponding; And, calculate and obtain the transmission block size estimation, and, from the transmission block table, read the transmitting block index value according to described transmission block size estimation according to described best code check;
The transmission block adjusting module, report the comparative result of index value according to the comparative result of the result of current demodulating data, described current quality token value and channel quality thresholds value and/or described transmitting block index value and CQI last time, regulate described transmitting block index value, obtain transmitting block index input value;
Data outputting module is used to export described transmitting block index input value and described best modulation system.
Preferably, above-mentioned described device, described data processing module comprises:
The signal interference ratio estimation unit is used to obtain the signal interference ratio estimated value of described channel quality to be measured;
The signal interference ratio processing unit, it is level and smooth and/or time slot is level and smooth that described signal interference ratio estimated value is carried out frame, obtains level and smooth signal interference ratio value, and setting described level and smooth signal interference ratio value is described current quality token value.
Preferably, above-mentioned described device, described data processing module also comprises:
The signal interference ratio estimation unit is used to obtain the signal interference ratio estimated value of described channel quality to be measured;
The signal interference ratio processing unit, it is level and smooth and/or time slot is level and smooth that described signal interference ratio estimated value is carried out frame, obtains level and smooth signal interference ratio value;
The signal-to-noise ratio (SNR) estimation unit is used to obtain the signal-to-noise ratio (SNR) estimation value of described channel quality to be measured;
The signal to noise ratio processing unit, it is level and smooth to be used for that described signal-to-noise ratio (SNR) estimation value is carried out frame, obtains level and smooth snr value;
Select control unit, be used for selecting the minimum value of described level and smooth signal interference ratio value and described level and smooth snr value, setting described minimum value is described current quality token value.
Preferably, above-mentioned described device, described data processing module also comprises:
Data demodulation module is used to obtain the result after the current high-speed downlink shared channel HS-DSCH of the demodulation data, and described result is fed back to described transmission block adjusting module.
In the technique scheme at least one has following beneficial effect: described method and apparatus is in the CQI value of reporting computational process, in rate tables, directly search acquisition rate estimation value according to the current quality token value of channel quality, need not complicated code check and calculate, therefore have the simple advantage of realization; In addition, in the computational process of the CQI value of reporting, also consider problems such as transmission block shake that channel quality shake brings, channel quality instability, for guaranteeing the accuracy of the CQI value of reporting, a series of accurate Calculation and adjusting have been carried out, as: carry out smoothing processing, adopt SIR and SNR to unite value to carry out CQI and estimate and increase the modes such as standard of CRC for measure channel quality as the transmission block selection, therefore this CQI report method can obtain optimum and report numerical value, guarantees the reliability and the high efficiency of HSDPA business.
Description of drawings
Fig. 1 is the flow chart of CQI report method of the present invention;
Fig. 2 adopts smooth manner to obtain the flow chart of CQI SI reporting R input value for illustrating after the present invention receives the HS-DSCH data;
Fig. 3 is the flow chart of the described CQI report method of first embodiment of the invention;
Fig. 4 is the structure chart of the described CQI reporting device of first embodiment of the invention;
Fig. 5 is the structure chart of the described CQI reporting device of second embodiment of the 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.
Described CQI report method of the specific embodiment of the invention and device, set up rate tables by experiment simulation in advance, the mapping of channel quality and code check is set up by rate tables, in the computational process of the CQI value of reporting, in rate tables, directly search acquisition rate estimation value according to the current quality token value (as signal interference ratio and/or signal to noise ratio) of channel quality, need not complicated code check calculates, carry out a series of accurate Calculation according to this rate estimation value afterwards and can determine the optimal data that CQI reports with regulating, this method is simple and effective, can obtain the parameter that reports of preferred channels quality indicator CQI.
Below will be described in detail described CQI report method of the specific embodiment of the invention and device.
As Fig. 1 is the flow chart of CQI report method of the present invention, consults Fig. 1, and described CQI report method also comprises the steps: from step S101
Step S102, initialization obtains the current quality token value of channel quality to be measured, and described current quality token value can adopt signal interference ratio (SIR) value and/or signal to noise ratio (snr) value representation;
Step S103 by described current quality token value and modulation system threshold value are compared, determines best modulation system, promptly in order to produce the modulation system that commending system is next time used;
Step S104 according to described current quality token value, searches the best code check under the described current quality token value from rate tables, the code check in the described rate tables and channel quality, transmission block size are corresponding;
Step S105 according to described best code check, calculates and obtains the transmission block size estimation; And, from the transmission block table, read the transmitting block index value according to described transmission block size estimation;
Step S106, report the comparative result of index value according to the comparative result of the result of current demodulating data, described current quality token value and channel quality thresholds value and/or described transmitting block index value and CQI last time, regulate described transmitting block index value, obtain the transmitting block index input value that described current C QI reports;
Step S107 exports described transmitting block index input value and described best modulation system;
Step S108 finishes.
The present invention is in above-mentioned step S102, because the accuracy and the stability of channel quality measurement are the keys of CQI method, therefore in order to increase the stability that CQI reports, preferably, CQI report method of the present invention carries out smoothing processing for channel quality to be measured, to obtain metastable channel quality value;
Carrying out smooth mode and can adopt between the level and smooth or time slot of interframe smoothly, is example to obtain sir value, and smooth manner carries out according to formula (1):
SIR m ‾ = Σ i = n m α i × SNR i - - - ( 1 )
When wherein time slot is level and smooth, SIR iThe signal interference ratio sir measurement value of expression time slot i, α iThe smoothing factor of representing i business time-slot, The signal interference ratio sir value of the level and smooth back frame of expression; When frame is level and smooth, SIR iThe signal interference ratio sir value of representing the i frame, α iThe smoothing factor of representing the i frame,
Figure A200910081063D00123
The level and smooth signal interference ratio sir value of expression multiframe.
When adopting the time slot smooth mode, the frame that needs the time slot place is identical or continuous, is continuous and necessarily require level and smooth frame when adopting frame level and smooth, and the level and smooth used sir value of frame is the values of all business time-slots after level and smooth in addition.For SIR can reflect the situation of change of channel, only the measurement SIR in the 2-3 frame is carried out smoothly usually, do not consider the more history value of morning.
Fig. 2 adopts smooth manner to obtain the flow chart of CQI SI reporting R input value for illustrating after the present invention receives the HS-DSCH data, specifically may further comprise the steps:
S202, SIR currency and history value initialization;
S203 obtains the SIR estimated value that HS-DSCH takies all time slots;
S204 is by smoothly obtaining the level and smooth sir value of present frame to the SIR estimated value that takies HS-DSCH;
S205 carries out smoothly obtaining the SIR input value that CQI reports to the level and smooth sir value of present frame and the level and smooth sir value of former frame;
S206, the level and smooth sir value of record present frame, next time, the level and smooth sir value of present frame participated in calculating as the level and smooth sir value of former frame when calculating;
S207, the SIR input value is converted to the output of dB form, is used for the input of CQI report method;
S208 finishes.
In addition, best, CQI report method of the present invention, because the unsteadiness of channel quality, unite value with SIR and SNR and carry out CQI and estimate to improve the accuracy that reports CQI, also promptly estimate to measure the SNR and the sir value of channel quality data part to be measured respectively, afterwards the estimated value of this SNR and SIR is carried out respectively smoothly, obtain the smooth value of SNR and SIR, select numerical value lower in two values to select the current quality token value of input as CQI.Wherein the measurement of SNR is measured with useful data after joint-detection, and the measurement of SIR is then handled the back at channel impulse response and measured with the midamble data.
Those skilled in the art of the present invention are appreciated that and to obtain sir value similar, the SNR value is carried out the frame smooth mode can carry out according to formula (2):
SNR m ‾ = Σ i = m - G m α i × SNR i - - - ( 2 )
Wherein: SNR iThe SNR measured value of representing the i frame,
Figure A200910081063D00132
The level and smooth SNR value of representing the m frame, α iThe smoothing factor of representing the i frame, G are represented the sum of smoothed frame.
In addition, receive and to adopt after the HS-DSCH data smooth manner to obtain step that CQI reports the SNR input value as shown in Figure 2, be not described in detail in this.
After obtaining CQI and report required current quality token value (SIR input value and/or SNR input value) according to said method, the concrete implementation step of CQI report method of the present invention can be consulted shown in Figure 3, and Fig. 3 is the flow chart of the described CQI report method of first embodiment of the invention.
Consult Fig. 3, the described CQI report method of first embodiment of the invention also comprises from step S301:
Step S302 obtains the current quality token value of channel quality to be measured;
When with SIR as the current quality token parameter, when estimating as CQI with sir value, this step is also promptly carried out as the flow process of Fig. 2, adopts smooth manner to determine current SIR smooth value as current quality token value, the input when being used for CQI and reporting calculating; When uniting value with SIR and SNR when estimating as CQI, this step is removed the flow process of carrying out as Fig. 2, adopt smooth manner to determine outside the current SIR smooth value, also according to smooth manner as Fig. 2, obtain the current SNR smooth value, and the size of current SIR smooth value and the current SNR smooth value of obtaining relatively, the smaller who selects both is as current quality token value, the input when being used for CQI and reporting calculating.
Step S303, whether determining step current quality token value that S302 obtains is 16QAM (16 Quadrature Amplitude Modulation greater than modulation system, 16 symbol quadrature-amplitude modulation) thresholding (T1), if judged result is for being, then downward execution in step S304, if judged result is for denying then downward execution in step S305;
Step S304, setting best modulation system is 16QAM, is used for the output that CQI reports;
Step S305, setting best modulation system is QPSK (Quadrature Phase Shift Keying, quadrature phase shift key), is used for the output that CQI reports;
Step S306, according to step current quality token value that S302 obtains, search the best code check under this current quality token value from rate tables, described rate tables is to set up by experiment simulation in advance, and the code check in the rate tables and channel quality, transmission block size are corresponding.Because code check is the ratio of transport block length and shared physical code channel resource, therefore, by this median of code check, can associate channel quality and transmission block size.By respectively QPSK and 16QAM being calculated code check separately, promptly the range of code rates of QPSK and 16QAM is [0,1], can improve precision when the code check fixed point is represented;
Step S307 according to the best code check that step S306 is obtained, determines the transmission block size estimation; This transmission block size estimation can obtain according to the physical resource number and the code check product of channel;
Step S308 according to described transmission block size estimation, reads the transmitting block index value from the transmission block table;
Because step rate tables that S306 uses is to obtain by emulation, therefore the code check in the rate tables is an estimation reference value, the transmission block size that obtains according to code check also only is an estimated value, might not just in time be the numerical value in the transmission block table, therefore also need the value in this estimated value and the transmission block table is compared, the value of selecting a best from the transmission block table is as transmission block sizes values accurately, according to this transmission block sizes values more accurately, further from the transmission block table, read the transmitting block index value afterwards.
In first embodiment of the invention, for guaranteeing to satisfy the error rate (BLER) of system requirements, in the transmission block table, select according to the principle of getting downwards, promptly the transmission block value in the table is less than the maximum in the transmission block estimated value;
Step S309, whether the transmission block of HS-DSCH data of judging current demodulation is correct, if CRC is (Cyclical Redundancy Check, cyclic redundancy detects) mistake, need be according to the number of crc error modulation transmissions piece down, finely tune the transmitting block index value according to this result like this, can adapt to various environment; If this step judged result is for being, execution in step S310 downwards then, if judged result is not for, then downward execution in step S311;
Step S310 adopts reduction adjustment step-length on the basis of adjusting step-length at last once CQI reporting measurement channel quality, obtains current adjustment step-length;
Step S311 adopts increase adjustment step-length on the basis of adjusting step-length in last once measure channel quality, obtains current adjustment step-length;
Step S312 according to the current adjustment step-length of step S310 or S311 acquisition, deducts this current adjustment step-length with the transmitting block index value and obtains to adjust back transmitting block index value;
Whether step S313 judges current quality token value less than channel quality thresholds value (T), if judged result is for denying then downward execution in step S314; If judged result is for being then downward execution in step S315;
Step S314, setting described adjustment back transmitting block index value is described transmitting block index input value;
Step S315 judges that further described back transmitting block index value and the CQI last time of adjusting reports the absolute value of difference of index value whether greater than an adjacent transmitting block index difference thresholding (S), if judged result is for being then downward execution in step S316; If judged result is for denying then downward execution in step S317;
Step S316 judges that again described last time CQI reports index value whether greater than described adjustment back transmitting block index value; If judged result is for being, execution in step S318 downwards then, if judged result is not for, then downward execution in step S319;
Step S317, setting described adjustment back transmitting block index value is described transmitting block index input value, afterwards execution in step S320;
Step S318, the setting value that reports index value to deduct described adjacent transmitting block index threshold value (S) acquisition described last time CQI is described transmitting block index input value;
Step S319, reporting index value to add the setting value that the above adjacent transmitting block index threshold value (S) obtained described last time CQI is described transmitting block index input value;
Step S320 exports described transmitting block index input value and the described regulative mode that is worth most;
Step S321 finishes.
The described CQI report method of first embodiment of the invention, by above-mentioned step S315 to S319, by reporting index value relatively to determine the current transmitting block index input value that reports with CQI last time, therefore increased special processing, overcome channel quality and shaken the transmission block shake that brings and cause the inaccurate problem of measuring for low signal-to-noise ratio.
The present invention also provides a kind of CQI reporting device on the other hand, consults Fig. 4, the schematic diagram of this CQI reporting device first embodiment, and this CQI reporting device comprises:
Data processing module 10 is used to obtain the current quality token value of channel quality to be measured, and this current quality token value is current signal interference ratio value and/or current snr value;
In first embodiment of CQI reporting device, wherein this data processing module 10 comprises:
Signal interference ratio estimation unit 11 is used to obtain the signal interference ratio estimated value of channel quality to be measured;
Signal interference ratio processing unit 12 is used for this signal interference ratio estimated value is carried out the level and smooth and/or current signal interference ratio smooth value of the level and smooth acquisition of time slot of frame, and setting this current level and smooth signal interference ratio value is current quality token value; Best, treat that measure channel quality is carried out smooth mode and method can be carried out with reference to formula 1 and Fig. 2, be not described in detail in this;
Modulation demodulation system is selected module 20, is used for determining best modulation system by this current quality token value and modulation system threshold value are compared; When judging that this current quality token value is the thresholding (T) of 16QAM greater than modulation system, then setting best modulation system is 16QAM; When judging that this current quality token value is the thresholding (T) of 16QAM greater than modulation system, then setting modulation system is QPSK;
Transmission block primary election module 30 is used for according to described current quality token value, searches the best code check under the described current quality token value from rate tables, and the code check in the described rate tables and channel quality, transmission block size are corresponding; And, calculate and obtain the transmission block size estimation, and, from the transmission block table, read the transmitting block index value according to described transmission block size estimation according to described best code check;
Wherein, rate tables is by experiment simulation foundation in advance, this transmission block size estimation can obtain according to the physical resource number and the code check product of channel, in addition according to described transmission block size estimation, from the transmission block table, read the mode of transmitting block index value, be to adopt to select according to the principle of getting downwards in the transmission block table, promptly the transmission block value in the table is less than the maximum in the transmission block estimated value;
Data demodulation module 40 is used to obtain the result after the current high-speed downlink shared channel HS-DSCH of the demodulation data;
Transmission block adjusting module 50, be used for reporting at the comparative result of the result of current demodulate transmitted piece, described current quality token value and channel quality thresholds value and/or described transmitting block index value and CQI last time the comparative result of index value according to data demodulation module 40, regulate the transmitting block index value respectively, obtain transmitting block index input value;
Wherein this transmission block adjusting module 50 is finely tuned the mode of transmitting block index value according to the result of current demodulate transmitted piece, if crc error, need therefore finely tune, in order to adapt to various environment according to the number of crc error modulation transmissions piece down according to the error of code check;
This transmission block adjusting module 50 is according to the comparative result of transmitting block index threshold value, and with reference to last time reporting index value, further regulates described transmitting block index value, and concrete regulative mode can be consulted the step S315 to S319 of Fig. 3;
Data outputting module 60 is used to export described transmitting block index input value and described best modulation system.
In addition, the present invention also provides the CQI reporting device of another structure, in Fig. 5 CQI reporting device second embodiment of the present invention, consider the unsteadiness of measure channel quality, different with first embodiment, the described CQI reporting device of second embodiment is when data processing module 10 obtains the current quality token value of channel quality to be measured, carry out CQI with SNR and SIR joint estimate and select, the input of selecting value lower in two values to select as CQI.
Particularly, this data processing module 10 also comprises signal-to-noise ratio (SNR) estimation unit 13, signal to noise ratio processing unit 14 and selects control unit 15 except that signal interference ratio estimation unit 11 that comprises first embodiment and signal interference ratio processing unit 12.Identical among signal interference ratio estimation unit 11 and signal interference ratio processing unit 12 and first embodiment, and wherein:
Signal-to-noise ratio (SNR) estimation unit 13 is used to obtain the signal-to-noise ratio (SNR) estimation value of described channel quality to be measured;
Signal to noise ratio processing unit 14 is used for described signal-to-noise ratio (SNR) estimation value is carried out the current signal to noise ratio smooth value of the level and smooth acquisition of frame;
Select control unit 15, be used for selecting the minimum value of signal interference ratio smooth value and signal to noise ratio smooth value, this minimum value is set at current quality token value, the input value that reports as CQI.
Identical with first embodiment, CQI reporting device second embodiment of the present invention also comprises: modulation demodulation system is selected module 20, transmission block primary election module 30, data demodulation module 40, transmission block adjusting module 50 and data outputting module 60, the function of each module is identical with first embodiment, is not described in detail in this.
Comprehensively above-mentioned, described CQI reporting device of the specific embodiment of the invention and method have following beneficial effect:
(1) in the CQI value of reporting computational process, in rate tables, directly search acquisition rate estimation value according to the current quality token value of channel quality, need not complicated code check and calculate, so method is simple;
(2) definite value that also reports of the CQI value of reporting with reference to last CQI, therefore increased special processing for low signal-to-noise ratio, overcome the transmission block shake that the channel quality shake brings, solve under the very poor situation of channel circumstance, the inaccuracy that is caused by measurement increases problem;
(3) increased the standard that CRC selects as transmission block, can finely tune to adapt to various environment the error of code check;
(4) in order to increase the stability that CQI reports, carry out smoothing processing, can obtain metastable channel quality value for measure channel quality.
(5), adopt SIR and SNR to unite value and carry out the accuracy that CQI estimates to improve the CQI value of reporting at the instability problem of channel quality;
(6) according to described transmission block size estimation, when from the transmission block table, reading the transmitting block index value, adopt the strategy of getting to guarantee to satisfy the error rate of system requirements downwards.
Thereby, described CQI report method of the specific embodiment of the invention and device, what make CQI in the HSDPA business reports process simple and effectively, and can obtain the parameter that reports of preferred channels quality indicator, guarantees the reliability and the high efficiency of HSDPA business.
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 (14)

1. the method that channel quality indicator CQI reports is applied to time division high speed downlink packet access technique TD-HSDPA system, it is characterized in that described method comprises:
Obtain the current quality token value of channel quality to be measured, described current quality token value is signal interference ratio value and/or snr value, by described current quality token value and modulation system threshold value are compared, determines the best modulation system that current C QI reports;
According to described current quality token value, from rate tables, search the best code check under the described current quality token value, the code check in the described rate tables and channel quality, transmission block size are corresponding;
According to described best code check, calculate and obtain the transmission block size estimation, and, from the transmission block table, read the transmitting block index value according to described transmission block size estimation;
Report the comparative result of index value according to the comparative result of the result of current demodulating data, described current quality token value and channel quality thresholds value and/or described transmitting block index value and CQI last time, regulate described transmitting block index value, obtain the transmitting block index input value that described current C QI reports;
Export described transmitting block index input value and described best modulation system.
2. the method for claim 1 is characterized in that, described current quality token value is the signal interference ratio sir value of described channel quality to be measured, and the step that obtains described current quality token value comprises:
Obtain the signal interference ratio estimated value of described channel quality to be measured;
It is level and smooth and/or time slot is level and smooth that described signal interference ratio estimated value is carried out frame, obtains level and smooth signal interference ratio value, and setting described level and smooth signal interference ratio value is described current quality token value.
3. the method for claim 1 is characterized in that, described current quality token value is the minimum value that the signal interference ratio sir value of described channel quality to be measured is compared with the signal to noise ratio snr value, and the step that obtains described current quality token value comprises:
Obtain the signal interference ratio estimated value of described channel quality to be measured, it is level and smooth and/or time slot is level and smooth that described signal interference ratio estimated value is carried out frame, obtains level and smooth signal interference ratio value;
Obtain the signal-to-noise ratio (SNR) estimation value of described channel quality to be measured, it is level and smooth that described signal-to-noise ratio (SNR) estimation value is carried out frame, obtains level and smooth snr value;
Described level and smooth signal interference ratio value and described level and smooth snr value compare, and select the minimum value of described level and smooth signal interference ratio value and described level and smooth snr value, and setting described minimum value is described current quality token value.
4. the method for claim 1 is characterized in that, by described current quality token value and modulation system threshold value are compared, determines that the step of best modulation system specifically comprises:
Described current quality token value and modulation system are that the threshold value of 16 symbol quadrature-amplitude modulation QAM compares, judge that whether described current quality token value is the threshold value of 16QAM greater than described modulation system, if judged result is for being, then setting described best modulation system is 16QAM, if judged result is then set described best modulation system and is quadrature phase shift key QPSK modulation for not.
5. the method for claim 1 is characterized in that, described rate tables is that emulation by experiment obtains.
6. the method for claim 1 is characterized in that, according to described transmission block size estimation, reads in the step of described transmitting block index value from described transmission block table, adopts the mode of downward peek value from described transmission block table.
7. the method for claim 1 is characterized in that, described result according to current demodulating data, and the step of regulating described transmitting block index value specifically comprises:
Obtain the result after the demodulation high-speed downlink shared channel HS-DSCH data, whether the transport block data of judging current demodulation is correct, if judged result is for being, then CQI last time report adopt to reduce on the basis of adjusting step-length and adjust step-length, obtain current adjustment step-length, if judged result then increases and adjusts step-length for not, obtain described current adjustment step-length;
According to described current adjustment step-length, described transmitting block index value is deducted described current adjustment step-length obtain to adjust back transmitting block index value.
8. method as claimed in claim 7, it is characterized in that, report the comparative result of index value according to the comparative result of described current quality token value and described channel quality thresholds value and/or described transmitting block index value and CQI last time, the step of regulating described transmitting block index value specifically comprises:
Whether judge described current quality token value less than described channel quality thresholds value, if judged result is not, then setting described adjustment back transmitting block index value is described transmitting block index input value; If judged result is for being, judge further that then afterwards transmitting block index value and described last time CQI report the absolute value of difference of index value whether greater than an adjacent transmitting block index difference thresholding in described adjustment;
If the result of described further judgement is not, then setting described adjustment back transmitting block index value is described transmitting block index input value; If whether the result of described further judgement, then judges described last time CQI again for being and reports index value greater than the back transmitting block index value of described adjustment;
If the described result who judges again is for being, then setting described last time CQI, to report index value to deduct the numerical value that described adjacent transmitting block index threshold value obtains be described transmitting block index input value, to report index value to add the numerical value that the above adjacent transmitting block index threshold value obtained be described transmitting block index input value if the described result who judges again, then sets described last time CQI for not.
9. as claim 2 or 3 described methods, it is characterized in that, be the described channel quality to be measured smoothing formula that level and smooth and/or time slot is level and smooth according to frame when obtaining described current signal interference ratio sir value:
SIR m ‾ = Σ i = n m α i × SIR i
Wherein: when time slot is level and smooth, SIR iThe signal interference ratio sir measurement value of expression time slot i, α iThe smoothing factor of representing i business time-slot,
Figure A200910081063C00042
The signal interference ratio sir value of the level and smooth back frame of expression; When frame is level and smooth, SIR iThe signal interference ratio sir value of representing the i frame, α iThe smoothing factor of representing the i frame,
Figure A200910081063C00043
The level and smooth signal interference ratio sir value of expression multiframe.
10. method as claimed in claim 3 is characterized in that, the smoothing formula when described channel quality to be measured is obtained described current signal to noise ratio snr value according to frame is level and smooth is:
SNR m ‾ = Σ i = m - G m α i × SNR i
Wherein: SNR iThe signal to noise ratio snr measured value of representing the i frame, The level and smooth signal to noise ratio snr value of representing the m frame, α iThe smoothing factor of representing the i frame, G are represented the sum of smoothed frame.
11. the device that channel quality indicator CQI reports is applied to time division high speed downlink packet access technique TD-HSDPA system, it is characterized in that described device comprises:
Data processing module is used to obtain the current quality token value of channel quality to be measured, and described current quality token value is signal interference ratio value and/or snr value;
Modulation demodulation system is selected module, is used for determining the best modulation system that current C QI reports by described current quality token value and modulation system threshold value are compared;
Transmission block primary election module is used for according to described current quality token value, searches the best code check under the described current quality token value from rate tables, and the code check in the described rate tables and channel quality, transmission block size are corresponding; And, calculate and obtain the transmission block size estimation, and, from the transmission block table, read the transmitting block index value according to described transmission block size estimation according to described best code check;
The transmission block adjusting module, report the comparative result of index value according to the comparative result of the result of current demodulating data, described current quality token value and channel quality thresholds value and/or described transmitting block index value and CQI last time, regulate described transmitting block index value, obtain transmitting block index input value;
Data outputting module is used to export described transmitting block index input value and described best modulation system.
12. device as claimed in claim 11 is characterized in that, described data processing module comprises:
The signal interference ratio estimation unit is used to obtain the signal interference ratio estimated value of described channel quality to be measured;
The signal interference ratio processing unit, it is level and smooth and/or time slot is level and smooth that described signal interference ratio estimated value is carried out frame, obtains level and smooth signal interference ratio value, and setting described level and smooth signal interference ratio value is described current quality token value.
13. device as claimed in claim 11 is characterized in that, described data processing module also comprises:
The signal interference ratio estimation unit is used to obtain the signal interference ratio estimated value of described channel quality to be measured;
The signal interference ratio processing unit, it is level and smooth and/or time slot is level and smooth that described signal interference ratio estimated value is carried out frame, obtains level and smooth signal interference ratio value;
The signal-to-noise ratio (SNR) estimation unit is used to obtain the signal-to-noise ratio (SNR) estimation value of described channel quality to be measured;
The signal to noise ratio processing unit, it is level and smooth to be used for that described signal-to-noise ratio (SNR) estimation value is carried out frame, obtains level and smooth snr value;
Select control unit, be used for selecting the minimum value of described level and smooth signal interference ratio value and described level and smooth snr value, setting described minimum value is described current quality token value.
14. device as claimed in claim 11 is characterized in that, described data processing module also comprises:
Data demodulation module is used to obtain the result after the current high-speed downlink shared channel HS-DSCH of the demodulation data, and described result is fed back to described transmission block adjusting module.
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