CN1728582A - Method for tracking and correcting error of indication of channel quality in WCDMA system - Google Patents
Method for tracking and correcting error of indication of channel quality in WCDMA system Download PDFInfo
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Abstract
When CQl value in HS-PDSCH channel reported from UE to base station cannot truly reflect actual quality of the HS-PDSCH channel, the invention determines whether CQl value reported from UE to reflect quality of the HS-PDSCH channel is true or not by estimating rate of error block of down going signal in HS-PDSCH channel o base station as well as relation between the estimated rate of error block and actual rate of error block. When there is deviation between the said reported CQl value and CQl value of reflecting actual quality of the HS-PDSCH channel, the invention makes the said reported CQl value agree with CQl value of reflecting actual quality of the HS-PDSCH channel by tracking and adjusting power of down going signal or reported CQl value from UE. Thus, base station is able to distribute system resource reasonably in order to raise system performance.
Description
Technical field
The present invention relates to the Channel Transmission technology of Wideband Code Division Multiple Access (WCDMA) WCDMA system, be meant the tracking method for correcting error of channel quality indication in a kind of WCDMA system especially.
Background technology
It is a kind of modulation and demodulation algorithm that 3GPP proposes in order to satisfy the asymmetric demand of up-downgoing data service in the R5 agreement that the high rate downlink data bag inserts HSDPA, it can be under the situation that does not change existing WCDMA network configuration, downstream data traffic speed is brought up to 10Mbps, and this technology is an important technology that the WCDMA networking later stage improves downlink capacity and data service rate.
In the HSDPA algorithm, user UE feeds back the channel quality indicator (CQI) of high-speed downlink shared channel HS-DSCH in up link High-Speed Dedicated Physical Control Channel HS-DPCCH, by analyzing the CQI value that all UE report, the channel quality condition of each UE can be known in the base station, thus the distribution of decision shared resource in each UE.CQI is defined as follows among the agreement 3GPP: in unrestricted observation time, UE reports a CQI value the highest to the base station, this value satisfies: the single HS-PDSCH subframe that UE can receive in the reference time of 3 time slots before beginning to report 1 time slot of this CQI value is according to this CQI value or than hanging down the corresponding transmission block size of CQI value, HS-PDSCH yardage and modulation system formation, and block error rate BLER is no more than 0.1.By above definition as can be known, each CQI value is all corresponding with certain transmission block size, HS-PDSCH yardage and modulation system, the CQI value that the base station reports according to UE just selects to send transmission block size, coded system and the modulation system of data, improves the service efficiency of whole sub-district by being used in combination of three.
In order to obtain correct CQI value, in general, UE at first estimates the signal to noise ratio of HS-PDSCH channel, then according to the signal noise ratio level of HS-PDSCH channel, curve according to the signal to noise ratio and the channel quality indicator (CQI) value of HS-PDSCH received signal obtains corresponding C QI value.And the signal to noise ratio of this HS-PDSCH channel obtains in the following way, supposes that the formula of the reception gross power of calculating HS-PDSCH channel is: P
HSPDSCH=P
CPICH+ Γ+Δ dB, wherein P
HSPDSCHReception gross power for the HS-PDSCH channel; P
CPICHThe received power of the Common Pilot Channel CPICH that measures for UE; Γ is the measurement power bias by the relative Common Pilot Channel CPICH received power of HS-PDSCH down transmitting power of upper strata RNC configuration; Δ is the reference power adjustment amount, it depends on the grade separation of UE and the channel quality condition CQI that reported at that time, and its value is generally 0, when the fine so that data volume of channel quality reaches the grade restriction of UE, Δ just can become negative value, to reduce the transmitting power on the HS-PDSCHs.Details are referring to standard agreement 3GPP TS 25.433 V5.8.0 (2004-03) chapters and sections 6A.2.By above formula as can be known, there are certain proportionate relationship in HS-PDSCH channel and CPICH channel on transmission power level, because the path loss that their arrive UE process is identical, can think that also there are certain proportionate relationship in the signal to noise ratio of HS-PDSCH channel of UE side and the signal to noise ratio on the CPICH channel.Therefore UE is by measuring the signal to noise ratio snr of CPICH channel
CPICH UEWith the measurement power bias Γ of RNC configuration, then according to formula
Calculate the signal to noise ratio snr of HS-PDSCH channel received signal
HSPDSCH UE, and then obtain the CQI value of HS-PDSCH channel.
In the prior art, at first RNC can dispose respectively to base station and UE measuring power bias Γ; Secondly, UE is according to the signal to noise ratio snr of the CPICH channel that measures
CPICH UEMeasurement power bias Γ with the RNC configuration passes through formula
Calculate the signal to noise ratio snr of HS-PDSCH channel received signal
HSPDSCH UE, and then obtain corresponding C QI value by the curve of SNR and CQI value, and report the base station; Once more, the base station is according to the CPICH channel transmitting power value and the measurement power bias Γ of upper strata RNC configuration, by formula P
HSPDSCH=P
CPICH+ Γ+Δ dB calculates HS-PDSCH channel down transmitting power value; At last, the selection of data transmission format is carried out according to the CQI value that UE reports in the base station, comprises the size of data block, and the code channel number and the modulation system of emission are carried out data transmission then.
By said process as can be seen, the CQI value that the base station reports according to UE is carried out the distribution of power and the transmission of data, when the CQI value that reports as UE equals real CQI value, can make the base station that resource is carried out reasonable configuration, helps to improve the performance of system.Yet, on the one hand since each UE to the difference of HS-PDSCH channel demodulation performance, tend to occur the CQI value that UE reports and have a certain distance between the CQI value that reflects HS-PDSCH channel truth.On the other hand, because agreement regulation upper strata RNC sometimes can be at base station side allocating and measuring power bias Γ, make the base station can't obtain real CQI value, in the above both of these case, when the base station can't obtain real CQI value, just can't correctly assess the channel situation of UE, thereby influence the configuration of base station, finally cause the HSDPA mis-behave resource.
Summary of the invention
In view of this, main purpose of the present invention is to provide the tracking method for correcting error of channel quality indication in a kind of WCDMA system, solve when CQI value that UE reports and when having deviation between the CQI value really by this method, the elimination deviation obtains the problem of real CQI value.
In order to achieve the above object, technical scheme of the present invention mainly comprises following steps:
A, user UE are according to the signal to noise ratio of the Common Pilot Channel CPICH that measures and the measurement power bias of RNC configuration, signal to noise ratio by calculating described CPICH with measure the signal to noise ratio that the power bias sum obtains high-speed downlink shared channel HS-PDSCH received signal, and then obtain corresponding C QI value, and report the base station by the signal to noise ratio of HS-PDSCH received signal and the curve of channel quality indicator (CQI) value;
B, base station be according to the transmitting power of the CPICH that measures power bias and upper strata RNC configuration, the transmitting power by calculating described CPICH, measures the down transmitting power that power bias and reference power adjustment amount three sum obtain HS-PDSCH;
Transmission block size, HS-PDSCH yardage and the modulation system of data selected to send according to the CQI value that obtains in c, base station, sends data by HS-PDSCH to UE;
It is characterized in that this method further comprises:
D, UE decode to data after receiving the data of base station transmission, if decode successfully, then send the correct response message that receives to the base station, receive response message otherwise send mistake;
The Block Error Rate of UE by HS-PDSCH reception data estimated according to correct reception response message that receives and the wrong response message that receives in e, base station, and sets the reference value of a true Block Error Rate of reflection HS-PDSCH,
If the Block Error Rate of estimating gained is greater than this reference value, then the down transmitting power of HS-PDSCH is improved in the base station according to the step value of setting; Perhaps the base station keeps down transmitting power constant, reduces the CQI value that UE reports according to the step value of setting;
If the Block Error Rate of estimating gained is less than this reference value, then the base station reduces the down transmitting power of HS-PDSCH according to the step value of setting; Perhaps the base station keeps down transmitting power constant, increases the CQI value that UE reports according to the step value of setting.
In said method, base station side is measured power bias by upper strata RNC configuration among the described step b, as RNC during not at base station side allocating and measuring power bias, then specifies a value to measure power bias value as base station side arbitrarily.
Preferably, the base station side of appointment measurement power bias value is 0.
In said method, estimate among the described step e that UE by the method that HS-PDSCH receives the Block Error Rate of data is: the correct reception response message that makes the base station receive is a certain preset threshold with wrong reception response message sum, mistake in computation receives the ratio of response message and this preset threshold then, with the estimated value of this ratio as described Block Error Rate.
Preferably, setting the reference value that reflects the true Block Error Rate of HS-PDSCH among the described step e is 0.1.
In said method, described step e further comprises, according to sending data with the corresponding transmission block size of current C QI value, HS-PDSCH yardage and modulation system.
In sum, when the HS-PDSCH channel CQI value that the present invention reports the base station at UE can not truly reflect the actual mass situation of this HS-PDSCH channel, by estimating the Block Error Rate of base station HS-PDSCH channel downlink signal, and the Block Error Rate of gained and 0.1 relation are estimated in judgement, judge whether the CQI value that UE reports can truly reflect the HS-PDSCH quality of channel, and when having deviation between the CQI value of CQI value that UE reports and true reflection HS-PDSCH channel quality, then down transmitting power by progressively follow the tracks of adjusting the base station or CQI value that UE reports make the CQI value that UE reports and the actual mass situation of HS-PDSCH channel match, thereby make that the base station can reasonable distribution system resource, improve systematic function.
Description of drawings
Fig. 1 is the method flow diagram of the specific embodiment of the invention one;
Fig. 2 is the method flow diagram of the specific embodiment of the invention two.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Embodiment one
The technical scheme of present embodiment is that the base station is by adjusting the measurement power bias value Γ of its side, the method that the CQI value that realization reports UE is followed the tracks of correction, as shown in Figure 1, comprise the steps: specifically that UE is according to the signal to noise ratio snr of the CPICH channel that measures in step 101
CPICH UEMeasurement power bias Γ with the RNC configuration passes through formula
Calculate the signal to noise ratio snr of HS-PDSCH channel received signal
HSPDSCH UE, and then obtain corresponding C QI value by the curve of SNR and CQI value, and report the base station.
In step 102, judge whether RNC has disposed measurement power bias Γ in base station side, if, then direct execution in step 103, otherwise the base station is specified a value arbitrarily for measuring power bias Γ, and as Γ=0, execution in step 103 then.
In step 103, the base station is according to the CPICH channel transmitting power value of measurement power bias Γ that obtains and upper strata RNC configuration, by formula P
HSPDSCH=P
CPICH+ Γ+Δ dB calculates HS-PDSCH channel down transmitting power value.
In step 104, the CQI value that the base station reports according to UE, selection sends transmission block size, HS-PDSCH yardage and the modulation system of data, sends data by the HS-PDSCH channel to UE.
In step 105, UE decodes to data after receiving the data of base station transmission, if decode successfully, then replys (ACK) message to correct reception of base station transmission, replys (NACK) message otherwise send the mistake reception.
In step 106, the base station is according to the ACK and the NACK message that receive, estimate that UE receives the block error rate BLER of data by the HS-PDSCH channel, method of estimation is: when the sum of ACK that receives and NACK reaches preset threshold N, as 100 o'clock, calculate NACK/ (NACK+ACK), if the reference value of the true Block Error Rate of reflection HS-PDSCH that the result of calculating gained equals to set, as 0.1, illustrate that then the CQI value that UE reports equals real CQT value; If greater than 0.1, then execution in step 107; If less than 0.1, then execution in step 108.
In step 107, the base station is improved HS-PDSCH channel down transmitting power value, i.e. P according to the stepping step1 that sets as 1dB
PDSCH+ 1, execution in step 104 then.
In step 108, the base station reduces HS-PDSCH channel down transmitting power value according to the stepping step1 that sets, and execution in step 104 then.
Embodiment two
The technical scheme of present embodiment is the CQI value that the base station reports by adjustment UE, and the method that the CQI value that realization reports UE is followed the tracks of correction as shown in Figure 2, specifically comprises the steps:
In step 201, UE is according to the signal to noise ratio snr of the CPICH channel that measures
CPICH UEMeasurement power bias Γ with the RNC configuration passes through formula
Calculate the signal to noise ratio snr of HS-PDSCH channel received signal
HSPDSCH UE, and then obtain corresponding C QI value by the curve of SNR and CQI value, and report the base station.
In step 202, judge whether RNC has disposed measurement power bias Γ in base station side, if, then direct execution in step 203, otherwise the base station is specified a value arbitrarily for measuring power bias Γ, and as Γ=0, execution in step 203 then.
In step 203, the base station is according to the CPICH channel transmitting power value of measurement power bias Γ that obtains and upper strata RNC configuration, by formula P
HSPDSCH=P
CPICH+ Γ+Δ dB calculates HS-PDSCH channel down transmitting power value.
In step 204, transmission block size, HS-PDSCH yardage and the modulation system of data selected to send according to the CQI value that obtains in the base station, sends data by the HS-PDSCH channel to UE.
In step 205, UE decodes to data after receiving the data of base station transmission, if decode successfully, then replys (ACK) message to correct reception of base station transmission, replys (NACK) message otherwise send the mistake reception.
In step 206, the base station is according to the ACK and the NACK message that receive, estimate that UE receives the block error rate BLER of data by the HS-PDSCH channel, method of estimation is: when the sum of ACK that receives and NACK reaches preset threshold N, as 100 o'clock, calculate NACK/ (NACK+ACK), if the reference value of the true Block Error Rate of reflection HS-PDSCH that result of calculation equals to set, as 0.1, illustrate that then the CQI value that UE reports equals real CQI value; If greater than 0.1, then execution in step 205; If less than 0.1, then execution in step 206.
In step 207, the base station reduces the CQI value that UE reports according to the stepping step2 that sets, and execution in step 204 then.
In step 208, the base station increases the CQI value that UE reports according to the stepping step2 that sets, and execution in step 204 then.
In a word, the above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (7)
1, the tracking method for correcting error of channel quality indication in a kind of WCDMA system comprises the steps:
A, user UE are according to the signal to noise ratio of the Common Pilot Channel CPICH that measures and the measurement power bias of RNC configuration, signal to noise ratio by calculating described CPICH with measure the signal to noise ratio that the power bias sum obtains high-speed downlink shared channel HS-PDSCH received signal, and then obtain corresponding C QI value, and report the base station by the signal to noise ratio of HS-PDSCH received signal and the curve of channel quality indicator (CQI) value;
B, base station be according to the transmitting power of the CPICH that measures power bias and upper strata RNC configuration, the transmitting power by calculating described CPICH, measures the down transmitting power that power bias and reference power adjustment amount three sum obtain HS-PDSCH;
Transmission block size, HS-PDSCH yardage and the modulation system of data selected to send according to the CQI value that obtains in c, base station, sends data by HS-PDSCH to UE;
It is characterized in that this method further comprises:
D, UE decode to data after receiving the data of base station transmission, if decode successfully, then send the correct response message that receives to the base station, receive response message otherwise send mistake;
The Block Error Rate of UE by HS-PDSCH reception data estimated according to correct reception response message that receives and the wrong response message that receives in e, base station, and sets the reference value of a true Block Error Rate of reflection HS-PDSCH,
If the Block Error Rate of estimating gained is greater than this reference value, then the down transmitting power of HS-PDSCH is improved in the base station according to the step value of setting; Perhaps the base station keeps down transmitting power constant, reduces the CQI value that UE reports according to the step value of setting;
If the Block Error Rate of estimating gained is less than this reference value, then the base station reduces the down transmitting power of HS-PDSCH according to the step value of setting; Perhaps the base station keeps down transmitting power constant, increases the CQI value that UE reports according to the step value of setting.
2, the tracking method for correcting error of channel quality indication according to claim 1 is characterized in that: base station side measurement power bias is disposed by upper strata RNC among the described step b.
3, the tracking method for correcting error of channel quality according to claim 1 indication is characterized in that: in described step b, as RNC during not at base station side allocating and measuring power bias, then specify a value to measure power bias value as base station side arbitrarily.
4, the tracking method for correcting error of channel quality indication according to claim 3, it is characterized in that: it is 0 that the base station side of appointment is measured power bias value.
5, the tracking method for correcting error of channel quality indication according to claim 1, it is characterized in that: estimate among the described step e that UE comprises by the step that HS-PDSCH receives the Block Error Rate of data: when the correct reception response message that receives when the base station reaches a certain preset threshold with wrong reception response message sum, mistake in computation receives the ratio of response message and this preset threshold, and with the estimated value of ratio as described Block Error Rate.
6, the tracking method for correcting error of channel quality indication according to claim 1 is characterized in that: the reference value of setting the true Block Error Rate of reflection HS-PDSCH among the described step e is 0.1.
7, the tracking method for correcting error of channel quality indication according to claim 1 is characterized in that: described step e further comprises, according to sending data with the corresponding transmission block size of current C QI value, HS-PDSCH yardage and modulation system.
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| WO2011160570A1 (en) * | 2010-06-23 | 2011-12-29 | 中兴通讯股份有限公司 | Method and base station for correcting channel quality indicator (cqi) |
| US9065584B2 (en) | 2010-09-29 | 2015-06-23 | Qualcomm Incorporated | Method and apparatus for adjusting rise-over-thermal threshold |
| WO2012167442A1 (en) * | 2011-06-10 | 2012-12-13 | 华为技术有限公司 | Method and device for modifying channel quality indicator value |
| CN102265543A (en) * | 2011-06-10 | 2011-11-30 | 华为技术有限公司 | Method and device for correcting channel quality indication value |
| CN102265543B (en) * | 2011-06-10 | 2014-03-12 | 华为技术有限公司 | Method and device for correcting channel quality indication value |
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| CN103873198A (en) * | 2011-06-10 | 2014-06-18 | 华为技术有限公司 | Method and device for correcting channel quality indicator values |
| CN103812556B (en) * | 2013-10-08 | 2015-05-27 | 深圳光启创新技术有限公司 | Lighting parameter optimizing method for photon client |
| CN103812556A (en) * | 2013-10-08 | 2014-05-21 | 深圳光启创新技术有限公司 | Lighting parameter optimizing method for photon client |
| CN112291851A (en) * | 2019-07-25 | 2021-01-29 | 上海朗帛通信技术有限公司 | Method and apparatus in a node used for wireless communication |
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