CN1805426A - Method of correcting channel quality indication in high-speed downlink grouped data packet access - Google Patents
Method of correcting channel quality indication in high-speed downlink grouped data packet access Download PDFInfo
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- CN1805426A CN1805426A CN 200510002149 CN200510002149A CN1805426A CN 1805426 A CN1805426 A CN 1805426A CN 200510002149 CN200510002149 CN 200510002149 CN 200510002149 A CN200510002149 A CN 200510002149A CN 1805426 A CN1805426 A CN 1805426A
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Abstract
The invention relates to a method for correcting the channel quality when accessing the high-speed descending grouped data pack, which comprises: first, attaining the information about the special channel code emission power channel in preset time of wireless communication system; then according to said information, adjusting the channel quality instruction reported by user in said preset time to attain actual channel quality instruction. The invention uses the method that adjusting the CQI reported by present user to effectively track the CQI. The invention can eliminate the property loss caused by large CQI period reported by UE and the inaccurate CQI valve in the reporting period, to effectively improve the communication property of system.
Description
Technical field
The present invention relates to network communications technology field, relate in particular to the method for proofreading and correct CQI (channel quality indication) in a kind of high-speed downlink grouped data bag access.
Background technology
HSDPA (access of high rate downlink data bag) technology is a kind of modulation and demodulation algorithm that 3GPP (third generation communication system) proposes in order to satisfy the asymmetric demand of up-downgoing data service in the R5 agreement.This technology can be brought up to 10Mbps with downstream data traffic speed under the situation that does not change existing WCDMA (Wideband Code Division Multiple Access (WCDMA)) network configuration, be an important technology that the WCDMA networking later stage improves downlink capacity and data service rate.
The HSDPA technology is on original basis at unique user DPCH (downward special physical channel), public HS-SCCH (high-speed downlink shared channel control channel) and HS-PDSCH (high-speed down link Physical Shared Channel) channel have been increased, HS-SCCH channel bearing downlink signaling wherein, HS-PDSCH channel bearing data.
In the HSDPA algorithm, user UE feeds back the CQI (channel quality indication) of HS-DSCH (high-speed down link high speed shared channels) in HS-DPCCH (downlink high speed Dedicated Physical Control Channel); By analyzing the CQI value that all UE report, base station node B can know the channel quality condition of each UE, thus the distribution of decision shared resource in each UE.
In the 3GPP agreement, described CQI value is all corresponding with certain transmission block size, HS-PDSCH yardage and modulation system, and the CQI value that Node B (base station) reports according to UE just selects to send transmission block size, coded system and the modulation system of data.
In order to obtain correct CQI value, UE need estimate the signal to noise ratio of HS-PDSCH channel earlier usually, according to the signal noise ratio level of HS-PDSCH channel, chooses corresponding C QI value from CQI value mapping table then.
Because there are certain proportionate relationship in HS-PDSCH channel and CPICH channel on transmission power level, and, the path loss that HS-PDSCH channel and CPICH channel arrive the UE process is identical, thereby can think that there are certain proportionate relationship equally 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 of RNC configuration, then, according to formula
Can 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.
Described CQI is the indication of the relevant HS-PDSCH channel quality that reports of UE, by this parameter, can differentiate channel quality, is the important parameter during the HSDPA algorithm is realized.At present, also CQI is not followed the tracks of processing, in application process, only use recent CQI value of reporting.Yet owing to high-rise report the cycle frequency of CQI can be set to not wait from 2ms to 160ms to UE, therefore, if twice CQI report cycle is oversize, in the cycle that twice CQI reports, the variation of channel quality is timely informing base station just.That is to say,, can't correctly assess the channel quality condition of UE, may cause the HSDPA mis-behave thus, have influence on communication quality of communication systems if can't correctly estimate to obtain true CQI in the report cycle.
Summary of the invention
In view of above-mentioned existing in prior technology problem, the purpose of this invention is to provide the method for proofreading and correct the channel quality indication in a kind of high-speed downlink grouped data bag access, thereby make the network side of wireless communication system can obtain the true CQI of channel in the current system, to guarantee reliability of service transmission.
The objective of the invention is to be achieved through the following technical solutions:
The invention provides the method for proofreading and correct the channel quality indication in a kind of high-speed downlink grouped data bag access, comprising:
A, obtain in the wireless communication system dedicated channel sign indicating number territory transmit power variation information in the predetermined amount of time;
B, according to described dedicated channel sign indicating number territory transmit power variation information to the channel quality of the reporting of user in the described predetermined amount of time indication adjust, obtain the channel quality indication of current reality.
Described steps A comprises:
A1, when channel quality when indication of obtaining and recording user reports, record current time dedicated channel sign indicating number territory transmission power level;
A2, when the user prepares to launch data, determine the dedicated channel sign indicating number territory transmission power level of this moment;
A3, according to this moment dedicated channel sign indicating number territory transmission power level and record last one the moment dedicated channel sign indicating number territory transmission power level determine dedicated channel sign indicating number territory transmit power variation information.
Among the present invention, the described dedicated channel sign indicating number of steps A territory transmit power variation information is:
Difference information between the dedicated channel sign indicating number territory transmission power level in two moment that the calculating of log territory obtains.
Described dedicated channel sign indicating number territory transmitting power is:
Downward special physical channel DPCH sign indicating number territory transmitting power.
Described steps A 2 comprises:
According to the dedicated channel sign indicating number territory transmission power level of preserving in the base station, determine the downward special physical channel sign indicating number territory transmission power level of this moment.
Described step B comprises:
The channel quality of current reality is designated as the channel quality of original record and indicates the channel quality that difference information the obtained indication that deducts between the transmission power level of described dedicated channel sign indicating number territory.
The method of proofreading and correct the channel quality indication during described high-speed downlink grouped data bag inserts also comprises:
The channel quality indication (CQI) information of the reality of current channel is reported network side.
As seen from the above technical solution provided by the invention, the present invention has adopted the change information based on dedicated channel sign indicating number territory transmitting power in the predetermined amount of time, and the mode that the current CQI that reports of user adjusts is effectively followed the tracks of CQI.Therefore, the present invention has eliminated UE and has reported the CQI cycle excessive, and the CQI value is estimated the inaccurate performance loss that brings between report cycle, thereby has effectively improved the communication performance of system.
Description of drawings
Fig. 1 is the flow chart of method of the present invention.
Embodiment
Core of the present invention be utilize DPCH (downward special physical channel) code domain power at the fixed time situation of change the CQI that the cycle is obtained in the section adjust, more accurate to guarantee adjusted CQI.
In the WCDMA system, at unique user, common descending DPCH channel code has data to launch on the territory always, and is accompanied by the process of WCDMA up and down power control.
Descending DPCH channel code territory transmitting power is just carried out the power adjustment process one time every a slot (time slot), common 15 time scales that slot is a frame 10ms, power adjustment each time in fact all is the quick reflection to descending DPSH variations situation: when channel quality condition takes place to worsen, power control process can require descending DPCH channel code territory transmitting power to rise, when channel quality condition improved, power control process can require descending DPCH channel code territory transmitting power to descend.
Because user DPCH channel is identical with user-dependent HS-PDSCH channel on the path loss of power, therefore, the variation of DPCH channel upper signal channel quality can reflect the variations situation on this user HS-PDSCH channel.
The present invention utilizes the characteristics of user DPCH channel fast power control just, has realized that a kind of DPCH of utilization channel code domain power carries out the track algorithm of HS-DSCH channel CQI.
The specific implementation of method of the present invention specifically may further comprise the steps as shown in Figure 1:
Step 11: at first after the user whenever reported CQI value, the CQI value that writes down this moment t0 was CQI
T0With user DPCH channel code territory transmission power level;
The power adjustment control indication TPC that described DPCH channel code territory transmission power level is normally sent by reception UE side carries out the power adjustment, promptly on the basis of last once transmitting power, indicate the adjustment that increases and decreases power by TPC, adjustment cycle is generally a slot (time slot, about 0.667ms), UE can send different TPC indications according to current channel quality of reception situation of change, for example when channel quality degrades, can send on the occasion of TPC and require the increase of NodeB transmitting power; When otherwise channel quality improves, then send negative value TPC and require the NodeB transmitting power to reduce, the DPCH channel code territory transmission power level of described current time is kept at NodeB inside, directly can obtain.
Step 12: then in the ensuing time, when the user prepares to launch data on t1 moment HS-PDSCH channel, calculate the current moment and record DPCH sign indicating number territory transmit power variation information constantly, i.e. dedicated channel sign indicating number territory transmit power variation information on the user DPCH channel;
For determining described DPCH sign indicating number territory transmit power variation information, at first, need to determine current time DPCH sign indicating number territory transmission power level, the concrete mode of obtaining this value according to the description in the above-mentioned steps 11 as can be known, the DPCH sign indicating number territory transmission power level of described current time can be directly in the base station according to the information acquisition of preservation;
Described DPCH sign indicating number territory transmit power variation information is the poor of DPCH sign indicating number territory transmitting power that the DPCH sign indicating number territory transmission power level of current time and previous moment preserve; Because the calculating of described DPCH sign indicating number territory transmitting power is all carried out in the log territory, therefore described difference is actually the relation of ratio, for example, DPCH channel code territory transmission power level is changed to y (the log territory is Y): Y-X=+3db by x (the log territory is X), show that actual performance number x and the relation of y are the x that y equals 2 times, wherein relation is: X=10logx, Y=10logy; Be y/x=10
(Y-X)/10=10
3/10=2.
Therefore, the difference of described DPCH sign indicating number territory transmitting power has also just reflected constantly the t1 and the ratio of the variations of t0 constantly;
Step 13:, calculate the CQI value of definite current time according to last one constantly CQI value of described DHCP sign indicating number territory transmit power variation information and record;
Be the CQI value CQI of current time
T1For: CQI
T1=CQI
T0-Δ, wherein Δ is the poor of described DPCH sign indicating number territory transmitting power, described CQI
T1Be the actual value of the channel quality indication of this moment.
The network side base station just can obtain each UE current time CQI value comparatively accurately like this, thereby reasonably for each UE distributes corresponding shared resource, thereby effectively guarantee the stability of HSPDA performance.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (7)
1, proofread and correct the method for channel quality indication during a kind of high-speed downlink grouped data bag inserts, it is characterized in that, comprising:
A, obtain in the wireless communication system dedicated channel sign indicating number territory transmit power variation information in the predetermined amount of time;
B, according to described dedicated channel sign indicating number territory transmit power variation information to the channel quality of the reporting of user in the described predetermined amount of time indication adjust, obtain the channel quality indication of current reality.
2, proofread and correct the method for channel quality indication during high-speed downlink grouped data bag according to claim 1 inserts, it is characterized in that described steps A comprises:
A1, when channel quality when indication of obtaining and recording user reports, record current time dedicated channel sign indicating number territory transmission power level;
A2, when the user prepares to launch data, determine the dedicated channel sign indicating number territory transmission power level of this moment;
A3, according to this moment dedicated channel sign indicating number territory transmission power level and record last one the moment dedicated channel sign indicating number territory transmission power level determine dedicated channel sign indicating number territory transmit power variation information.
3, proofread and correct the method for channel quality indication during high-speed downlink grouped data bag according to claim 1 and 2 inserts, it is characterized in that:
The described dedicated channel sign indicating number of steps A territory transmit power variation information is:
Difference information between the dedicated channel sign indicating number territory transmission power level in two moment that the calculating of log territory obtains.
4, proofread and correct the method for channel quality indication during high-speed downlink grouped data bag according to claim 3 inserts, it is characterized in that described dedicated channel sign indicating number territory transmitting power is:
Downward special physical channel DPCH sign indicating number territory transmitting power.
5, proofread and correct the method for channel quality indication during high-speed downlink grouped data bag according to claim 4 inserts, it is characterized in that described steps A 2 comprises:
According to the dedicated channel sign indicating number territory transmission power level of preserving in the base station, determine the downward special physical channel sign indicating number territory transmission power level of this moment.
6, proofread and correct the method for channel quality indication during high-speed downlink grouped data bag according to claim 3 inserts, it is characterized in that described step B comprises:
The channel quality of current reality is designated as the channel quality of original record and indicates the channel quality that difference information the obtained indication that deducts between the transmission power level of described dedicated channel sign indicating number territory.
7, proofread and correct the method for channel quality indication during high-speed downlink grouped data bag according to claim 1 and 2 inserts, it is characterized in that this method also comprises:
The channel quality indication (CQI) information of the reality of current channel is reported network side.
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| CN101420745B (en) * | 2007-10-23 | 2011-01-19 | 中兴通讯股份有限公司 | Channel quality indication regulation method for SDMA schema conversion |
| CN102186230A (en) * | 2011-05-12 | 2011-09-14 | 上海华为技术有限公司 | Method and device for processing channel quality |
| WO2012040935A1 (en) * | 2010-09-30 | 2012-04-05 | France Telecom Research & Development Beijing Company Limited | Channel quality information prediction method, device and system |
| CN101527612B (en) * | 2008-03-03 | 2012-04-25 | 鼎桥通信技术有限公司 | Method for reporting channel reference information |
| US8259698B2 (en) | 2007-08-06 | 2012-09-04 | Lg Electronics Inc. | Method of transmitting channel information in wireless communication system |
| CN102761397A (en) * | 2011-04-25 | 2012-10-31 | ***通信集团重庆有限公司 | CQI regulation method, device and system |
| CN102790996A (en) * | 2011-05-19 | 2012-11-21 | 中兴通讯股份有限公司 | Method, device and system for measuring downstream wireless transmission quality |
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| CN103916965A (en) * | 2008-10-31 | 2014-07-09 | 华为技术有限公司 | Method, device and system for resource allocation |
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