CN103873217A - Method and device for correcting CQI (channel quality indicator), and user equipment - Google Patents
Method and device for correcting CQI (channel quality indicator), and user equipment Download PDFInfo
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- CN103873217A CN103873217A CN201210546109.6A CN201210546109A CN103873217A CN 103873217 A CN103873217 A CN 103873217A CN 201210546109 A CN201210546109 A CN 201210546109A CN 103873217 A CN103873217 A CN 103873217A
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Abstract
The invention provides a method and a device for correcting a CQI (channel quality indicator), and user equipment. Better throughput can be obtained by performing more accurate channel quality indication. The method for correcting the CQI comprises the following steps: determining an SIR (signal to interference ratio) according to a receiving signal received from a base station; converting the determined SIR into the CQI; calculating a block error rate of the receiving signal; correcting the calculated CQI according to the block error rate; sending the corrected CQI value to the base station.
Description
Technical field
The present invention relates to HSDPA(High Speed Downlink Packet Access, high speed downlink packet access) technology, be particularly related to a kind of CQI(Channel Quality Indicator, channel quality instruction) bearing calibration and means for correcting, subscriber equipment.
Background technology
In mobile communication system, for improving descending data transmission rate, 3GPP(The 3rdGeneration Partnership Project, third generation partner program) introduce HSDPA technology in R5 version.HSDPA is a kind of link adaptation techniques.When user approaches base station, when channel condition is good, system is with very high rate transmissioning data; And when user is away from base station, when bad channel conditions, system adopts lower speed, instead of improve speed by the mode that increases power.This kind of link adaptation techniques is mainly by UE(User Equipment, subscriber equipment) feed back CQI to base station, realize according to the definite MCS (Modulation and Coding Scheme, Modulation and Coding Scheme) that sends data of described CQI next time base station.
HSDPA is mainly made up of two kinds of key technologies, they are HARQ (Hybrid AutomaticRepeat Request, mixed automatic retransfer) technology and AMC (Adaptive Modulation andCoding, adaptive modulation and coding) technology.
HARQ technology retransmits to realize by ACK/NACK message feedback is carried out to bad frame to requirement base station, base station.ACK/NACK judges that by receiving CRC (Cyclic Redundancy Check, the cyclic redundancy check (CRC)) code of data rear acquisition, ACK represent that Frame decoding is correct, and NACK represents that Frame decoding is incorrect.
AMC technology is adjusted transmitted data rates and data encoding mode (as shown in Figure 1) adaptively according to the CQI value of UE feedback, compensates with this influence of fading being caused to received signal due to channel variation.According to 3GPP standard, the BLER(Block Error Rate of data while adopting AMC technology, BLER (block error rate)) should not exceed 10%.
The implementation of AMC is: UE measures the SIR (Signal to Interference Ratio, signal-to-jamming ratio) of down channel, calculates CQI, and CQI is fed back to base station according to SIR.The MCS that next time sends data, according to the CQI of UE feedback, is determined in base station.
Fig. 2 illustrates the structural representation of the UE that is applicable to existing AMC technology.The RF(RadioFrequency of UE, radio frequency) radio-cell 10 amplifies and digital translation the signal sending from base station, to PDCCH(Physical downlink control channel, physical downlink control channel), PDSCH(Physical downlink shared channel, physical down link is shared channel), RS signal in PDSCH separates respectively resource mapping.Demodulating unit 20 carries out respectively demodulation to separating resource mapping each channel signal after treatment.Rate detecting unit 40 is according to the control signal detection rates information of exporting from demodulating unit 20.Decoding unit 30 is decoded to the data-signal of exporting from demodulating unit 20 according to rate information, and acquisition can be carried out the user data of back-end processing.SIR determination unit 50 carries out SIR mensuration to the RS signal of exporting from demodulating unit 20.The SIR that CQI converting unit 60 is measured SIR determination unit 50 converts CQI to.Now, according to the SIR-CQI mapping table by 3GPP defined, drawn the CQI value of unique correspondence by sir value mapping.The CQI value being obtained by CQI converting unit 60 is sent to base station by CQI transmitting element 70.
AMC technology is more responsive for CQI error and retardation ratio.Can the CQI information of UE feedback accurately react in real time channel condition the selecting properly of MCS is had a significant impact.May run into following problem according to the method for SIR mapping CQI merely:
1, channel circumstance is too complicated, and particularly, under external field environment complicated situation, SIR probably measures incorrect, therefore will affect the accuracy of CQI.
When the CQI value of feedback is while being greater than actual CQI value, modulate the data transmission rate that exceed its channel actual receiving ability according to the CQI value of feeding back for UE due to system, the data block error rate that UE receives will increase greatly, thereby cause the decline of UE throughput; When the CQI value of feedback is less than actual CQI value, system will distribute too much data transmission resources to UE, thereby causes the decline of entire system throughput.
2, the modulation scheduling strategy of each base station equipment business and terminal analysis instrument is varied, what have only selects MCS according to the CQI of UE feedback, what have also can be simultaneously with reference to selecting MCS according to the ACK/NACK message of HARQ technology feedback, even if make like this for identical feedback CQI value, base station also can modulate different data transmission rates, and the actual channel receiving ability of UE and data transmission rate can not well be mated.
Summary of the invention
The technical problem that the present invention solves is to provide a kind of bearing calibration of channel quality instruction and device, subscriber equipment, to improve the accuracy of CQI value of UE feedback.
The bearing calibration of a kind of channel quality instruction provided by the invention, comprises the following steps:
Measure reception environment quality according to the downstream signal receiving from base station;
Generate the channel quality instruction corresponding with measured reception environment quality;
The BLER (block error rate) of the data that calculating down physical channel transmits;
According to the difference of the BLER (block error rate) calculating and predefined object block error rate, described channel quality instruction is proofreaied and correct, and the channel quality instruction after proofreading and correct is sent to described base station.
The means for correcting of a kind of channel quality instruction provided by the invention, comprising:
Reception environment quality determination unit, for measuring reception environment quality according to the downstream signal receiving from base station;
Channel quality instruction generation unit, indicates for generating the channel quality corresponding with the reception environment quality of being measured by described reception environment quality determination unit;
Channel quality instruction correcting unit, for according to the BLER (block error rate) calculating and the difference of predefined object block error rate, proofreaies and correct described channel quality instruction;
Channel quality indication report unit, for sending to described base station by the channel quality instruction after described correction.
Subscriber equipment provided by the invention, comprises the means for correcting that aforesaid channel quality is indicated.
Compared with prior art, bearing calibration of the present invention and means for correcting, subscriber equipment have following beneficial effect:
Because embodiments of the present invention are according to the BLER (block error rate) by downlink data, proofread and correct the channel quality instruction obtaining by SIR, channel quality instruction after proofreading and correct is sent to base station, therefore, when each generation channel quality instruction, can channel quality instruction be proofreaied and correct as suitable value according to the reception environment in this moment, thereby channel quality instruction more accurately can be sent to base station.Therefore, can obtain better throughput, and can make the actual channel receiving ability of UE and data transmission rate mate.
Brief description of the drawings
Fig. 1 is the CQI mapping table by 3GPP defined;
Fig. 2 is the structural representation that is applicable to the UE of existing AMC;
Fig. 3 is the flow chart of embodiments of the invention CQI bearing calibration;
Fig. 4 is the workflow diagram of the UE of application the inventive method;
Fig. 5 is the workflow diagram of BLER computational methods in embodiments of the invention;
Fig. 6 is the workflow diagram that in embodiments of the invention, CQI adjusts step size computation method;
Fig. 7 is the structural representation of embodiment of the present invention means for correcting;
Fig. 8 is the UE structural representation that has adopted means for correcting of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the accompanying drawings and the specific embodiments.
Fig. 3 is the flow chart of the specific embodiment of the present invention CQI bearing calibration.
Determine for making up independent employing SIR the defect that CQI brings, inventor creatively adopts the transmission quality situation of downstream signal to proofread and correct CQI value, makes subscriber equipment can report more exactly the quality condition of reception environment to network side.
The CQI bearing calibration of the specific embodiment of the invention comprises:
Step S301, measures reception environment quality according to the downstream signal receiving from base station.
Owing to carrying out the transmission of signal between subscriber equipment and base station by wireless communication mode, owing to there being various disturbing factors in the environment of communication, thereby bring certain impact to integrality, the accuracy of signal.
For carrying out better communication, base station can be adjusted according to the residing reception environment of subscriber equipment power or other parameters of its transmitted signal conventionally, to promote communication quality.The quality condition of reception environment, normally adopts variety of way to measure by subscriber equipment, and reports to base station.
In prior art, there is the technology of many measure reception environment quality.Those skilled in the art will appreciate that reception environment quality can determine according to the transmission situation of downstream signal conventionally.
Feasible mode is the ratio calculating between power and the interfering signal power of downstream signal, calculates SIR, thereby by interference signal, the impact of downstream signal is estimated the quality of reception environment.
Step S302, generates the channel quality instruction corresponding with measured reception environment quality.
Channel quality indicator (CQI) is used to indicate reception environment quality, is conventionally generated by subscriber equipment, is carried in the message that subscriber equipment reports to base station and transfers to base station.
Because CQI is used for characterizing reception environment quality, therefore between CQI and the same excessively SIR that downstream signal measures, there is corresponding relation.
In prior art, conventionally adopt the mode of relation table to store the corresponding relation of SIR and CQI, the SIR that therefore can obtain according to step S301, obtains corresponding CQI value by searching SIR with the relation table of CQI.
Can certainly adopt other modes to record the corresponding relation of SIR and CQI, this is that those skilled in the art are understandable, does not repeat them here.
Step S303, the BLER (block error rate) of the data that calculating down physical channel transmits.
BLER (block error rate) is a kind of mode of characterization data transmission accuracy, can adopt various ways to calculate the BLER (block error rate) of the data that down physical channel transmits.
Have the factor of the multiple BLER (block error rate) that affects data, wherein, inventor finds that the quality condition of reception environment has a certain impact to BLER (block error rate).
Particularly, can obtain BLER (block error rate) by the CRC check code of periodic statistics reception data, the frame number of CRC check mistake is the BLER (block error rate) in this measurement period with the ratio of all adding up frame numbers.
Step S304, according to the difference of the BLER (block error rate) calculating and predefined object block error rate, proofreaies and correct described channel quality instruction.
As previously mentioned, BLER (block error rate) is associated with the existence of reception environment quality, therefore can adopt BLER (block error rate) that channel quality is indicated and proofreaied and correct.
Object block error rate is under existing channel reception environment quality, the lowest block error rate that can tolerate.This just requires the downlink data transmission rate of base station modulates and existing channel reception environment quality to match.
If the current BLER (block error rate) being calculated by step S303 is greater than object block error rate, just should turn down accordingly the channel quality instruction that feeds back to base station, base station reduces downlink data transmission rate according to the channel quality instruction after turning down is corresponding, is controlled in object block error rate so that terminal receives the BLER (block error rate) of data.
Relative, if described BLER (block error rate) is less than object block error rate, prove that current channel can hold the transfer of data of higher rate, should indicate base station to improve the transfer rate of downlink data.
Step S305, sends to described base station by the channel quality instruction after proofreading and correct.
Common, this channel quality instruction can return to base station by up channel by subscriber equipment, and this it will be appreciated by those skilled in the art that, repeats no more.
Particularly, in TDD LTE communication system or FDD LTE communication system, can report to base station by UL-SCH channel.
For ease of understanding such scheme, below with the example that is applied as in LTE system, CQI bearing calibration of the present invention is set forth.
With reference to figure 4, the CQI bearing calibration of the specific embodiment of the invention comprises the steps:
Step S401, UE measures SIR according to the downstream signal of PDSCH channel.
In the present embodiment, SIR is obtained by the ratio of (Reference Signal, the reference signal) power of the RS on PDSCH channel and interfering signal power.
The pilot signal of the similar CDMA of reference signal, thus be sometimes also pilot tone, for down physical channel demodulation and channel quality measurement.
Reference signal is hinted obliquely at and is obtained by cell specific reference signal sequence and frequency displacement.RS is the pseudo random sequence of propagating on time-frequency domain in essence.On some day line cap, the frequency domain interval of RS is 6 subcarriers.
RS is distributed on time-frequency domain discretely, is equivalent to the time-frequency domain characteristic of channel to sample, and provides reference for down channel estimation and signal demodulation.
The data signal levels that described data-signal power receives by measurement obtains, and obtains the interfering signal power in channel on this basis according to transmitting data level estimation.
Step S402, according to survey, the SIR obtaining calculates CQI value.
Calculate CQI value and also can adopt various ways to realize, a kind of feasible mode is SIR and the corresponding table of CQI providing according to 3GPP standard, can be obtained by SIR the CQI value of unique correspondence by this table.
Step S403, according to Frame CRC information computing block error rate.
The ratio of the bad frame number of the business datum receiving from PDSCH channel by periodic statistics in the present embodiment, and statistics totalframes obtains BLER (block error rate).
In PDSCH channel, carry actual traffic data, such as the speech data in communication process, note data, multi-medium data.The BLER (block error rate) of PDSCH channel is to weigh the key index of channel quality.
In a kind of specific embodiment, base station can also be according to the CQI of feedback to TBS(Transmit BlockSize, transport block size) dynamically adjust, in the control signal sending from base station, record TBS information, thereby should dynamically adjust equalization interval according to the size of this TBS.In the present embodiment, the relation of statistics totalframes and TBS is as shown in table 1 below:
Table 1
| TBS（bit） | Statistics totalframes |
| More than 30000 | 10 |
| 10000-30000 | 20 |
| Below 10000 | 40 |
Fig. 5 illustrates a kind of idiographic flow of computing block error rate, comprising:
Step S4031, first obtains relevant data transmission format parameter from PDCCH channel, for example: coded system, modulation system, TBS size etc.Calculate the statistics totalframes in a measurement period according to TBS size, and current frame number and bad frame are counted to zero clearing;
Step S4032, reads the CRC check information of actual traffic data frame in PDSCH channel, and current frame number is carried out to the operation that adds;
Step S4033, judges that whether the CRC check of current data frame is correct, if check errors performs step S4034; If check results is correct, perform step S4035;
Step S4034, does bad frame number the operation that adds;
Step S4035, judges whether current frame number has been greater than the totalframes of needs statistics, if so, performs step S4036, otherwise rebound step S4032;
Step S4036, the ratio of the bad frame number obtaining according to statistics and statistics totalframes obtains BLER (block error rate) BLER.
Step S404, calculates CQI corrected value according to BLER (block error rate) and adjusts step-length;
The BLER (block error rate) of the PDSCH channel calculating according to step S403, can reflect the relation between channel reception environment quality and downlink data transmission rate.
If block error rate is far longer than object block error rate, proves the ability that downlink data transmission rate can be carried far beyond channel, at this moment just CQI down should be adjusted to larger value, so that base station reduces data transmission rate.
If block error rate is less than or equal to object block error rate and only has less gap, just only needs fine setting or uncomfortable CQI value.So adjusting step-length, CQI corrected value reflects the correction amplitude to CQI.
Fig. 6 illustrates the concrete implementing procedure that calculates CQI corrected value adjustment step-length, comprising:
Step S4041, reads object block error rate.
In the present embodiment, object block error rate is redefined for 10%, i.e. the patient lowest block error rate of 3GPP regulation.
Certainly, those skilled in the art can choose according to actual conditions and demand the value of corresponding object block error rate.
Step S4042, judges whether the BLER (block error rate) being obtained by step S403 is greater than object block error rate, if so, execution step S4043, no person performs step S4044;
Step S4043, adjusts step-length by CQI corrected value and is set as:
(BLER (block error rate)-object block error rate)/10%;
In the situation that channel circumstance is poor, BLER (block error rate) may be far longer than object block error rate, at this moment needing has larger adjustment to CQI, in the present embodiment, adopt 10% for one-level adjustment step-length, for example, in the situation that BLER (block error rate) is greater than object block error rate 50%, the adjustment step-length of CQI corrected value is exactly 5.
Step S4044, adjusts step-length by CQI corrected value and is set as 1;
This step is the treatment step in the time that BLER (block error rate) is less than object block error rate, and BLER (block error rate) is less than target error rate proof downlink data transmission rate and has substantially mated current channel circumstance quality, only need to do fine tune to CQI.
Certainly, those skilled in the art can choose according to actual conditions and demand the step-length value of corresponding fine tune.
Step S405, adjusts step size computation CQI corrected value according to CQI corrected value.
The CQI corrected value adjustment step-length being obtained by step S404 has just obtained the correction amplitude of CQI, also wants the size of combined block error rate and object block error rate to determine the direction that CQI adjusts.If block error rate is greater than object block error rate, and CQI corrected value is that negative CQI corrected value is adjusted step-length, adjusts step-length otherwise CQI corrected value is positive CQI corrected value.
Step S406, makes the CQI value of calculating add CQI corrected value.
The CQI corrected value that the CQI value that step S402 is calculated and step S405 calculate obtains the CQI value after correction after being added.
Step S407, sends to base station by the CQI value after proofreading and correct.
Common, in LTE system, described CQI value can return to base station by up UL-SCH channel.
In other communication systems, can adopt corresponding up channel that the CQI after proofreading and correct is reported to base station.This it will be appreciated by those skilled in the art that, repeats no more.
CQI bearing calibration described in embodiment of the present invention, through step S401 to S407, the BLER (block error rate) that receives data by calculating is further proofreaied and correct CQI value, the better actual reception environment of the current channel of reflection of CQI value that makes feedback, makes base station modulates go out to be more suitable for the data transmission rate of current channel circumstance.
It is a kind of for realizing the device of described CQI bearing calibration that embodiment of the present invention also provides simultaneously, and as shown in Figure 7, this device comprises:
Reception environment quality determination unit 101, for measuring reception environment quality according to the downstream signal receiving from base station;
Channel quality instruction generation unit 102, indicates for generating the channel quality corresponding with the reception environment quality of being measured by described reception environment quality determination unit 101;
Channel quality instruction correcting unit 103, proofreaies and correct described channel quality instruction.
Channel quality indication report unit 104, for sending to described base station by the channel quality instruction after described correction.
For ease of understanding said apparatus, set forth as an example of actual user's terminal UE example below.Fig. 8 is the UE structure chart that adopts this device, comprising:
RX radio-cell 10, for receiving the aerial signal of each transmission from base station;
Wherein comprise the RS signal of PDSCH channel with the relevant channel of embodiment of the present invention, for measuring SIR; PDCCH channel, for receiving various data transmission format parameters; PDSCH channel, for receiving actual traffic data;
Decoding unit 30, for the PDSCH channel data decoding that demodulating unit 20 is exported;
Described parameter comprises modulation system, coded system, TBS size etc.;
Reception environment quality determination unit 101, the RX signal measuring SIR of the PDSCH channel of exporting from demodulating unit 20 for basis;
Described SIR can be obtained by the reception data-signal power of RX signal and the ratio of interfering signal power;
Channel quality instruction generation unit 102, calculates CQI value for the SIR measuring according to reception environment quality determination unit 101;
3GPP standard provides the correspondence table of SIR and CQI, can be obtained by SIR the CQI value of unique correspondence by this table;
Channel quality instruction correcting unit 103, for further proofreading and correct the CQI value obtaining from channel quality instruction generation unit 102 according to the BLER (block error rate) of the business datum of exporting from decoding unit 30.
Wherein this channel quality instruction correcting unit 103 comprises: step size computation unit 1033, channel quality instruction correction values calculation unit 1034, channel quality instruction corrected value adder unit 1035 are adjusted in object block error rate memory cell 1031, BLER (block error rate) computing unit 1032, channel quality instruction; Wherein,
Object block error rate memory cell 1031, this unit is non-volatile memory device, stores i.e. " the target BLER " of predetermined optimical block error rate.
Here,, as target BLER, suppose and set the optimum BLER (block error rate) " 10% " being specified by 3GPP.
BLER (block error rate) computing unit 1032, carries out mistake judgement by the CRC information that checks the data of being exported by decoding unit 30, and the reception error incidence of computing block unit is BLER (block error rate) BLER;
Step size computation unit 1033 is adjusted in channel quality instruction, and the BLER obtaining according to BLER (block error rate) computing unit 1032 and the difference of described target BLER are calculated CQI and adjusted step-length;
Channel quality instruction correction values calculation unit 1034, adjusts step-length according to the size of described target BLER and described BLER and described CQI, calculates the CQI corrected value for proofreading and correct the CQI value being calculated by channel quality instruction generation unit 102.
For example, it is in 20% situation that BLER (block error rate) computing unit 1032 calculates BLER, because BLER is greater than target BLER (10%) (reception environment is bad), thereby CQI corrected value is set as to " CQI adjusts step-length ".Otherwise, in the situation that BLER is 5%, because BLER is less than target BLER (reception environment is good), thereby CQI corrected value is set as to "+1 ".
Channel quality instruction corrected value adder unit 1035, adds that by the CQI value that channel quality instruction generation unit 102 is calculated the CQI corrected value that channel quality instruction correction values calculation unit 1034 calculates carrys out the CQI value after calculation correction.
Channel quality indication report unit 104, the CQI value after channel quality instruction correcting unit 103 is proofreaied and correct sends to base station.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles 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. a bearing calibration for channel quality instruction, is characterized in that, comprises the following steps:
Measure reception environment quality according to the downstream signal receiving from base station;
Generate the channel quality instruction corresponding with measured reception environment quality;
The BLER (block error rate) of the data that calculating down physical channel transmits;
According to the difference of the BLER (block error rate) calculating and predefined object block error rate, described channel quality instruction is proofreaied and correct, and
Channel quality instruction after proofreading and correct is sent to described base station.
2. bearing calibration according to claim 1, it is characterized in that, the BLER (block error rate) of the data that described calculating down physical channel transmits comprises: in a measurement period, add up the cyclic redundancy check (CRC) code of whole subframes of described down physical channel, calculate the BLER (block error rate) of described reception signal by sub-frame number and the ratio of whole sub-frame number of cyclic redundancy check (CRC) code mistake.
3. bearing calibration according to claim 1, is characterized in that, described down physical channel is PDSCH channel.
4. bearing calibration according to claim 2, is characterized in that, in the step of the BLER (block error rate) of the data that described calculating down physical channel transmits, dynamically determines the length of described measurement period according to the transmission block size of described down physical channel.
5. according to the bearing calibration described in claim 1 to 4 any one, it is characterized in that, described channel quality instruction has multiple adjustment step-lengths, and described correction comprises the adjustment step-length of calculating channel quality instruction according to the difference between described BLER (block error rate) and described object block error rate.
6. bearing calibration according to claim 5, it is characterized in that, the computational methods of the adjustment step-length of described channel quality instruction are specially: if the described BLER (block error rate) calculating is greater than described object block error rate, the adjustment step-length of described channel quality instruction is that described difference is divided by the whole value after object block error rate; If the BLER (block error rate) calculating is less than or equal to described object block error rate, the adjustment step-length of described channel quality instruction is predetermined value.
7. bearing calibration according to claim 5, is characterized in that, if the described BLER (block error rate) calculating is greater than described object block error rate, the corrected value of described channel quality instruction is the adjustment step-length of the described channel quality instruction born; If the described BLER (block error rate) calculating is less than or equal to described object block error rate, the corrected value of described channel quality instruction is the adjustment step-length that positive described channel quality is indicated; The described channel quality instruction generating is added with the corrected value of described channel quality instruction, so that described channel quality instruction is proofreaied and correct.
8. a means for correcting for channel quality instruction, is characterized in that, comprising:
Reception environment quality determination unit, for measuring reception environment quality according to the downstream signal receiving from base station;
Channel quality instruction generation unit, indicates for generating the channel quality corresponding with the reception environment quality of being measured by described reception environment quality determination unit;
Channel quality instruction correcting unit, for according to the BLER (block error rate) calculating and the difference of predefined object block error rate, proofreaies and correct described channel quality instruction;
Channel quality indication report unit, for sending to described base station by the channel quality instruction after proofreading and correct.
9. means for correcting according to claim 8, is characterized in that, described channel quality instruction correcting unit comprises:
BLER (block error rate) computing unit, for calculating the BLER (block error rate) of the data block receiving;
Object block error rate memory cell, for storing object block error rate;
Step size computation unit is adjusted in channel quality instruction, adjusts step-length for calculate channel quality instruction according to the difference between described BLER (block error rate) and object block error rate;
Channel quality instruction correction values calculation unit, for calculating channel quality instruction corrected value according to described BLER (block error rate) and described channel quality instruction adjustment step-length;
Channel quality instruction corrected value adder unit, for being added described channel quality instruction and described channel quality instruction corrected value.
10. means for correcting according to claim 9, it is characterized in that, described BLER (block error rate) computing unit is added up the cyclic redundancy check (CRC) code of whole subframes of described down physical channel in a measurement period, calculates the BLER (block error rate) of described reception signal by sub-frame number and the ratio of whole sub-frame number of cyclic redundancy check (CRC) code mistake.
11. means for correctings according to claim 10, is characterized in that, the transmission block size of the data that described BLER (block error rate) computing unit sends according to described base station dynamically determines the length of described measurement period.
12. means for correctings according to claim 9, it is characterized in that, described channel quality instruction is adjusted step size computation unit in the time that the described BLER (block error rate) calculating is greater than described object block error rate, and the adjustment step-length of described channel quality instruction is defined as to described difference divided by the whole value after object block error rate; In the time that the BLER (block error rate) calculating is less than or equal to described object block error rate, the adjustment step-length of described channel quality instruction is defined as to predetermined value.
13. means for correctings according to claim 9, is characterized in that, if the described BLER (block error rate) calculating is greater than described object block error rate, the corrected value of described channel quality instruction is the adjustment step-length of the described channel quality instruction born; If the described BLER (block error rate) calculating is less than or equal to described object block error rate, the corrected value of described channel quality instruction is the adjustment step-length that positive described channel quality is indicated.
14. 1 kinds of subscriber equipmenies, is characterized in that, comprise the means for correcting of the channel quality instruction as described in claim 8 to 13 any one.
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| CN106921465A (en) * | 2015-12-25 | 2017-07-04 | 北京展讯高科通信技术有限公司 | CQI threshold regulating methods and device |
| WO2018177049A1 (en) * | 2017-03-30 | 2018-10-04 | 华为技术有限公司 | Data transmission method, terminal device and network device |
| CN109765558A (en) * | 2019-02-01 | 2019-05-17 | 成都民航空管科技发展有限公司 | Signal methods of comparison and selection, primary processor, auxiliary processor and radar signal ratio select device |
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