CN101083492B - Method for performing power control from channel quality indication - Google Patents
Method for performing power control from channel quality indication Download PDFInfo
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- CN101083492B CN101083492B CN200610083832XA CN200610083832A CN101083492B CN 101083492 B CN101083492 B CN 101083492B CN 200610083832X A CN200610083832X A CN 200610083832XA CN 200610083832 A CN200610083832 A CN 200610083832A CN 101083492 B CN101083492 B CN 101083492B
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Abstract
The invention publishes a method on power control by the channel quality, which includes: obtain signal-to-noise ratio according to the quality of upward channel feedback channel; obtain signal-to-noise ratio of before de-spread according to the signal-to-noise ratio's relations between the signal before de-spread and the signal after de-spread; obtain signal-to-noise ratio of pilot frequency channel according to relation between the signal before de-spread and the goal channel's power. After carrying on simulation to this goal channel, obtain the target value of satisfy signal-to-noise ratio; obtain goal channel's power according to the relation between signal-to-noise ratio and target value of the goal channel. This method improves the channel's transmission quality to ensure the transmission reliability.
Description
Technical field
The present invention relates to a kind of method of power control, relate in particular to a kind of method of carrying out power control, be used in HSDPA (High Speed Downlink PacketAcess, the high speed downlink packet inserts) system by channel quality indication (CQI).
Background technology
Power control is one of most important technology in the mobile communication system, can improve received signal quality by power control, thereby improves the reliability of Radio Link.Simultaneously, traditional cdma communication system is again a self-interference system, and unnecessary unnecessary power can increase the interference of link, reduces the capacity and the throughput of sub-district, so good power control algorithm is of great advantage to mobile communication system.At moving communicating field, be proposed the down channel of sharing high-speed high capacity by a plurality of communication terminals, in carrying out the HSDPA system of high-speed packet transmission, downgoing line comprises: HS-DSCH (data channel), HS-SCCH (destination channel), CPICH (pilot channel) as lower channel, wherein, HS-DSCH channel, HS-SCCH channel are down channel, and the CPICH channel is a up channel.
Substantially all be to carry out transmitted power by TPC (TransmitPower Control, the transmitting power control) order that link feeds back to adjust in the former power control algorithm.And when also taking similar Poewr control method for some non-dedicated channels, some problems can appear, there is not soft handover such as the HS-SCCH channel in the HSDPA system, and dedicated channel has soft handover, that is to say UE (User Equipment when switching, communication terminal) carries out communicating by letter of dedicated channel with plural base station, and meanwhile UE only carries out communicating by letter of HS-SCCH channel with a base station, if the HS-SCCH channel adopts and the same power control algorithm of dedicated channel, might belong to the dedicated channel quality decline of same Radio Link so with HS-SCCH, thereby cause the Block Error Rate (BLER, Block Error Ratio) of HS-SCCH to increase.Therefore just need a kind of Poewr control method, to improve the transmission quality of dedicated channel.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method by the control of channel quality indication carrying out power, with the transmission quality of raising dedicated channel, thus the Block Error Rate of reduction HS-SCCH.
For addressing the above problem, the invention provides a kind of method by the control of channel quality indication carrying out power, comprise the steps:
(1) according to the signal to noise ratio after the channel quality indication specified data channel despreading of up channel feedback;
(2), obtain the signal to noise ratio before the data channel despreading by before the data channel despreading and the relation between the signal to noise ratio after the despreading;
(3), obtain the signal to noise ratio of this pilot channel by the relation between the signal to noise ratio of signal to noise ratio before the described data channel despreading and pilot channel;
(4), obtain the signal to noise ratio of this destination channel by the relation between the power of the power of described destination channel and described pilot channel;
(5) this destination channel is carried out link level simulation, be met the desired value of the signal to noise ratio of error block rate requirement;
(6), obtain the power of this destination channel by the relation between the desired value of the signal to noise ratio of this destination channel and signal to noise ratio.
Method of carrying out power control by channel quality indication of the present invention has improved the transmission quality of dedicated channel and has reduced the Block Error Rate of HS-SCCH, thereby has guaranteed the reliability of transmission of radio links.
Description of drawings
Fig. 1 is according to the described method flow schematic diagram by the control of channel quality indication carrying out power of the embodiment of the invention;
Fig. 2 is according to the signal to noise ratio of the described HS-DSCH channel of the embodiment of the invention and the relation between the BLER;
Fig. 3 is according to the signal to noise ratio of the described HS-SCCH channel of the embodiment of the invention and the relation between the BLER.
Embodiment
Below just the invention will be further described in conjunction with the accompanying drawings.
With reference to figure 1, be the described method flow schematic diagram of the embodiment of the invention by the control of channel quality indication carrying out power, detailed process is as follows:
Step 110: according to the signal to noise ratio after the channel quality indication specified data channel despreading of up channel feedback;
Step 120:, obtain the signal to noise ratio before the data channel despreading by before the data channel despreading and the relation between the signal to noise ratio after the despreading;
Step 130:, obtain the signal to noise ratio of this pilot channel by the relation between the signal to noise ratio of signal to noise ratio before the described data channel despreading and pilot channel;
Step 140:, obtain the signal to noise ratio of this destination channel by the relation between the power of the power of described destination channel and described pilot channel;
Step 150: this destination channel is carried out link level simulation, be met the desired value of the signal to noise ratio of error block rate requirement;
Step 160:, obtain the power of this destination channel by the relation between the desired value of the signal to noise ratio of this destination channel and signal to noise ratio.
Wherein, as described in step 110, be signal to noise ratio HSDSCH_Es/N0 after the despreading of HS-DSCH channel is determined in the indication of the entrained channel quality of CPICH channel according to up channel, as the formula (1), corresponding 10% Block Error Rate of this signal to noise ratio.
HSDSCH_Es/N0=f (CQI) formula (1)
Wherein, f is the functional relation between the Es/N0 of CQI and HS-DSCH channel, and Es/N0 represents the signal to noise ratio of symbol level.This function can obtain by emulation, with reference to the simulation result of figure 2 as can be known, and HSDSCH_Ec/N0=CQI-4.5.
Wherein, as described in step 120,, can draw the signal to noise ratio HSDSCH_Ec/N0 before the despreading of HS-DSCH channel according to the relation of signal to noise ratio before the despreading of HS-DSCH channel and after the despreading, as the formula (2):
HSDSCH_Ec/N0=HSDSCH_Es/N0-10*log (SF) formula (2)
Wherein, SF is meant the spreading factor of HS-DSCH channel, the signal to noise ratio of Ec/N0 indication code chip level.
Wherein, as described in step 130, according to the definition of CQI as can be known, when calculating CQI, power P _ CPICH that the power of setting the HS-DSCH channel equals the CPICH channel adds and measures power excursion (MPO), sees formula (3):
P_HSDSCH=P_CPICH+MPO formula (3)
Can release the chip-level signal to noise ratio Ec/N0 of CPICH channel receiving terminal according to formula (2) and formula (3), see formula (4):
CPICH_Ec/N0=HSDSCH_Ec/N0-MPO formula (4)
Wherein, as described in step 140, the power of setting the HS-SCCH channel is P_HSSCCH, can obtain the chip-level signal to noise ratio of HS-SCCH channel receiving terminal, sees formula (5):
HSSCCH_Ec/N0=CPICH_Ec/N0+P_HSSCCH-P_CPICH formula (5)
Wherein, as described in step 150, draw the desired value Ec/N0_target of HS-SCCH channel in the receiving terminal signal to noise ratio that satisfies the BLER requirement by emulation.The HS-SCCH channel is carried out the emulation of shortterm,, obtain the graph of a relation of block error rate BLER and signal to noise ratio then according to statistics, as shown in Figure 3 at the Block Error Rate of receiving terminal statistics instantaneous signal-to-noise ratio and HS-SCCH.
Wherein, as described in step 160,, need for satisfying the performance requirement of HS-SCCH channel:
HSSCCH_Ec/N0＞=Ec/N0_target formula (6)
Be: CPICH_Ec/N0+P_HSSCCH-P_CPICH＞=Ec/N0_target formula (7)
Thereby obtain the power of HS-SCCH channel, see formula (8):
P_HSSCCH＞=Ec/N0_target-CPICH_Ec/N0+P_CPICH formula (8)
Claims (6)
1. the method by the control of channel quality indication carrying out power is characterized in that, indicates the power control of carrying out destination channel according to the channel quality of up channel feedback, comprises the steps:
(1) according to the signal to noise ratio after the channel quality indication specified data channel despreading of up channel feedback;
(2), obtain the signal to noise ratio before the data channel despreading by before the data channel despreading and the relation between the signal to noise ratio after the despreading;
(3), obtain the signal to noise ratio of this pilot channel by the relation between the signal to noise ratio of signal to noise ratio before the described data channel despreading and pilot channel;
(4), obtain the signal to noise ratio of this destination channel by the relation between the power of the power of described destination channel and described pilot channel;
(5) this destination channel is carried out link level simulation, be met the desired value of the signal to noise ratio of error block rate requirement;
(6), obtain the power of this destination channel by the relation between the desired value of the signal to noise ratio of this destination channel and signal to noise ratio.
2. the method for claim 1 is characterized in that, the signal to noise ratio after the described data channel despreading of step (1) is represented with following formula:
HSDSCH_Es/N0＝f(CQI)
Wherein, f is the functional relation between the Es/N0 of CQI and HS-DSCH channel, and Es/N0 represents the signal to noise ratio of symbol level.
3. the method for claim 1 is characterized in that, the signal to noise ratio before the described data channel despreading of step (2) calculates with following formula:
HSDSCH_Ec/N0＝HSDSCH_Es/N0-10*log(SF)
Wherein, SF is meant the spreading factor of HS-DSCH channel, the signal to noise ratio of Ec/N0 indication code chip level, and Es/N0 represents the signal to noise ratio of symbol level.
4. the method for claim 1 is characterized in that, the signal to noise ratio of the described pilot channel of step (3) is calculated by following formula:
CPICH_Ec/N0＝HSDSCH_Ec/N0-MPO
Wherein, MPO refers to measure power excursion, the signal to noise ratio of Ec/N0 indication code chip level.
5. the method for claim 1 is characterized in that, the signal to noise ratio of the described destination channel of step (4) is calculated by following formula:
HSSCCH_Ec/N0＝CPICH_Ec/N0+P_HSSCCH-P_CPICH
Wherein, P_HSSCCH represents the power of destination channel, and P_CPICH represents the power of pilot channel, the signal to noise ratio of Ec/N0 indication code chip level.
6. the method for claim 1 is characterized in that, in the described step (6), further comprise: the signal to noise ratio of destination channel is represented with following formula more than or equal to the desired value of signal to noise ratio:
HSSCCH_Ec/N0＞＝Ec/N0_target
Wherein, the signal to noise ratio of Ec/N0 indication code chip level, Ec/N0_target represents the desired value of this destination channel signal to noise ratio.
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101431791B (en) * | 2007-12-27 | 2010-06-09 | 华为技术有限公司 | HSPA power distribution method, system and apparatus |
| CN101247150B (en) * | 2008-02-28 | 2013-03-27 | 中兴通讯股份有限公司 | External loop power control method and device for HSDSCH, BLER regulation method and device |
| CN101582707B (en) * | 2008-05-12 | 2016-08-31 | 联想(北京)有限公司 | A kind of power distribution method and base station thereof |
| CN103582102B (en) * | 2012-07-31 | 2018-06-05 | 深圳市中兴微电子技术有限公司 | The power regulating method and device of HS-SCCH |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1349292A2 (en) * | 2002-03-26 | 2003-10-01 | Samsung Electronics Co., Ltd. | Apparatus and method for coding and decoding Channel Quality Indicator information in communication system using high speed downlink packet access |
| CN1650547A (en) * | 2002-06-28 | 2005-08-03 | 松下电器产业株式会社 | Transmission power control method and base station device |
| CN1720698A (en) * | 2002-12-04 | 2006-01-11 | 美商内数位科技公司 | Reliability detection of channel quality indicator (CQI) and application to outer loop power control |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1349292A2 (en) * | 2002-03-26 | 2003-10-01 | Samsung Electronics Co., Ltd. | Apparatus and method for coding and decoding Channel Quality Indicator information in communication system using high speed downlink packet access |
| CN1650547A (en) * | 2002-06-28 | 2005-08-03 | 松下电器产业株式会社 | Transmission power control method and base station device |
| CN1720698A (en) * | 2002-12-04 | 2006-01-11 | 美商内数位科技公司 | Reliability detection of channel quality indicator (CQI) and application to outer loop power control |
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