CN101945421A - Closed-loop power control method and device - Google Patents
Closed-loop power control method and device Download PDFInfo
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- CN101945421A CN101945421A CN2010102913139A CN201010291313A CN101945421A CN 101945421 A CN101945421 A CN 101945421A CN 2010102913139 A CN2010102913139 A CN 2010102913139A CN 201010291313 A CN201010291313 A CN 201010291313A CN 101945421 A CN101945421 A CN 101945421A
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Abstract
The invention provides a closed-loop power control method and device. The method comprises the following steps: measuring the signal quality of received special bursts; when the number of the continuously received special bursts reaches the first number, carrying out low-pass filtering on the signal quality corresponding to the first number of special bursts to obtain first signal quality; carrying out transmission block equivalence on the first number of special bursts to obtain the equivalence result, wherein when the first signal quality is more than the first threshold, the equivalence result is correct reception of the second number of transmission blocks, and when the first signal to noise ratio (SNR) is not more than the first threshold, the equivalence result is wrong reception of the second number of transmission blocks; and outputting the equivalence result to an outer-loop power control module for the outer-loop power control module to determine the SNR target value for inner-loop power control. The invention can ensure continuity of outer-loop power control.
Description
Technical field
The invention belongs to wireless communication technology field, particularly a kind of close-loop power controlling method and device that is applied in TD SDMA (TD-SCDMA) system.
Background technology
As everyone knows, power is controlled at the key effect that plays the decision systems capacity in code division multiple access (CDMA) system.Power control is divided into open Loop Power control process and closed power control procedure, wherein, has comprised inner loop power control procedure and exterior ring power control procedure in the closed power control procedure again.
Exterior ring power control, its objective is by actual signal quality (being Block Error Rate) and compare with professional required target signal qualities to monitoring, obtain the signal to noise ratio (snr) desired value of a real-time update, and this signal-to-noise target value is configured to the use of inner loop power control procedure; Inner loop power control, it is according to the signal to noise ratio of current measurement, and several signal-to-noise ratio measurements of past, predicts the signal to noise ratio of next subframe, and, draw the power control command word of adjusting about power by comparing the signal-to-noise target value that the control of signal-to-noise ratio to predict value and exterior ring power provides.
Block Error Rate in the exterior ring power control is to obtain by transmission block is carried out CRC check.But, in conversation procedure, after high-rise (radio resource control layer) Radio Link foundation is finished, when high level does not have data to transmit, physical layer directly sends special burst (special burst), owing to do not have CRC check in the special burst, therefore, just do not have the CRC check result to be input in the exterior ring power control module yet.If ignored the influence of special burst to exterior ring power control, promptly during sending special burst, exterior ring power control stops to adjust, and has three kinds of situations like this and occurs:
Situation one, if the SNR desired value before special burst sends is too high, inner loop power control adjustment result can increase the power requirement to network, promptly increase the power load of network, especially at the borderline region of sub-district, that is to say the interference that has increased network, and, the call drop probability of network integral body increased.
Situation two, low excessively if special burst sends SNR desired value before, then may cause Radio Link physical layer step-out, thereby cause high-rise step-out, cause call drop.
Situation three if the SNR desired value of running into before the transmission special burst is suitable just, then what influence link is not had, but the probability that this situation runs into is quite low in the environment of reality.
Summary of the invention
Technical problem to be solved by this invention provides a kind of close-loop power controlling method and device, makes exterior ring power control to carry out continuously.
For solving the problems of the technologies described above, it is as follows to the invention provides technical scheme:
A kind of close-loop power controlling method comprises:
The signal quality of the special burst that measurement receives;
When the number of the special burst that receives continuously reaches first number, the signal quality of described first number special burst correspondence is carried out low-pass filtering, obtain first signal quality;
Described first number special burst is carried out the transmission block equivalence, obtain equivalent result, wherein, when described first signal quality during greater than first thresholding, described equivalent result is for correctly receiving second number transmission block, when described first signal to noise ratio was not more than described first thresholding, described equivalent result was that mistake receives second number transmission block;
Described equivalent result is outputed to the exterior ring power control module, be identified for the signal-to-noise target value of inner loop power control for described exterior ring power control module.
Above-mentioned method wherein, also comprises:
Determine described second number according to the transmission block number that first transformat comprises, wherein, described first transformat is in the transformat combination of reference transmission channel correspondence, comprises the maximum transformat of transmission block number.
Above-mentioned method, wherein, the described transmission block number that comprises according to first transformat is determined described second number, comprising:
When the transmission block number that comprises when described first transformat is less than or equal to second thresholding, determine that described second number is 1;
The transmission block number that comprises when described first transformat is greater than described second thresholding, and when being less than or equal to the 3rd thresholding, determines that described second number is N1;
The transmission block number that comprises when described first transformat determines that described second number is N2 during greater than described the 3rd thresholding;
Wherein, described the 3rd thresholding is greater than described second thresholding, and N1, N2 are the integer greater than 1, and N2 is greater than N1.
Above-mentioned method, wherein, described signal quality is a signal to noise ratio.
A kind of closed-loop power control device comprises:
The snr measurement module is used to measure the signal quality of the special burst that receives;
Low-pass filtering module is used for when the number of the special burst that receives continuously reaches first number, and the signal quality of described first number special burst correspondence is carried out low-pass filtering, obtains first signal quality;
The transmission block equivalent modules, be used for described first number special burst is carried out the transmission block equivalence, obtain equivalent result, wherein, when described first signal quality during greater than first thresholding, described equivalent result is for correctly receiving second number transmission block, and when described first signal quality was not more than described first thresholding, described equivalent result was that mistake receives second number transmission block;
Output module is used for described equivalent result is outputed to the exterior ring power control module, is identified for the signal-to-noise target value of inner loop power control for described exterior ring power control module.
Above-mentioned device wherein, also comprises:
Equivalence number determination module, the transmission block number that is used for comprising according to first transformat is determined described second number, wherein, described first transformat is in the transformat combination of reference transmission channel correspondence, comprises the maximum transformat of transmission block number.
Above-mentioned device, wherein, described equivalent number determination module is further used for:
When the transmission block number that comprises when described first transformat is less than or equal to second thresholding, determine that described second number is 1;
The transmission block number that comprises when described first transformat is greater than described second thresholding, and when being less than or equal to the 3rd thresholding, determines that described second number is N1;
The transmission block number that comprises when described first transformat determines that described second number is N2 during greater than described the 3rd thresholding;
Wherein, described the 3rd thresholding is greater than described second thresholding, and N1, N2 are the integer greater than 1, and N2 is greater than N1.
Above-mentioned device, wherein, described signal quality is a signal to noise ratio.
Compared with prior art, the invention has the beneficial effects as follows:
The present invention is by carrying out the transmission block equivalence to the special burst that receives, and equivalent result outputed to the exterior ring power control module, be identified for the signal-to-noise target value of inner loop power control for described exterior ring power control module, so, guaranteed the continuity of exterior ring power control, reduced the requirement of receiving terminal, thereby reduced the interference level of network integral body the transmitting terminal transmitted power.
Description of drawings
Fig. 1 is the close-loop power controlling method flow chart of the embodiment of the invention;
Fig. 2 is the closed-loop power control device structure chart of the embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the accompanying drawings and the specific embodiments.
At not having CRC check owing in the special burst in the prior art, thereby make the problem that exterior ring power control stops, whether the embodiment of the invention carries out the equivalence of transmission block according to the number judgement of the special burst that receives continuously, and judge it is correct the reception or the wrong transmission block that receives according to the signal to noise ratio of special burst, so, guaranteed the continuity of exterior ring power control effectively, reduced the requirement of receiving terminal, thereby reduced the interference level of network integral body the transmitting terminal transmitted power.
With reference to Fig. 1, the close-loop power controlling method of the embodiment of the invention comprises the steps:
Step 101: the signal to noise ratio of measuring the special burst that receives;
Received signal quality to special burst is measured, and in the present embodiment, the metric of signal quality is a signal to noise ratio, and the signal to noise ratio of the special burst that measures is stored, and simultaneously the special burst that receives is continuously counted.
Step 102: when the number of the special burst that receives continuously reaches first number, the signal to noise ratio of described first number special burst correspondence is carried out low-pass filtering, obtain first signal to noise ratio;
Judge whether to carry out the equivalence of transmission block,, then need to carry out the equivalent process of transmission block if the number of the special burst that receives continuously reaches first number.Carry out the equivalence of transmission block if desired, then first number signal to noise ratio of continuous storage is carried out low-pass filtering, obtain first signal to noise ratio, all signal to noise ratios of storage are before this removed, and restarted the special burst that receives is continuously counted.Wherein, low-pass filtering is meant a plurality of signal to noise ratios is averaged or the weighted average processing; Described first number can be set as the case may be, for example, is set at 8 or 16.
If the number of the special burst that receives does not continuously reach first number, then, begin to receive normal transmission block, then judge the equivalent process that does not need to carry out transmission block, all signal to noise ratios of storage are removed, and, when beginning to receive special burst again, restart counting to the number zero clearing of the special burst that receives continuously.
Step 103: described first number special burst is carried out the transmission block equivalence, obtain equivalent result;
Wherein, when described first signal to noise ratio during greater than first thresholding, described equivalent result is for correctly receiving second number transmission block, and when described first signal to noise ratio was not more than described first thresholding, described equivalent result was that mistake receives second number transmission block.Described first thresholding can be set as the case may be, for example, is set at 6dB.
Preferably, determine described second number according to the transmission block number that first transformat comprises, wherein, described first transformat is in the transformat combination of reference transmission channel correspondence, comprises the maximum transformat of transmission block number, and is specific as follows:
When the transmission block number that comprises when described first transformat is less than or equal to second thresholding, determine that described second number is 1;
The transmission block number that comprises when described first transformat is greater than described second thresholding, and when being less than or equal to the 3rd thresholding, determines that described second number is N1;
The transmission block number that comprises when described first transformat determines that described second number is N2 during greater than described the 3rd thresholding;
Wherein, described the 3rd thresholding is greater than described second thresholding, and N1, N2 are the integer greater than 1, and N2 is greater than N1.These values also can be set as the case may be, and for example, setting second thresholding is that 2, the three thresholdings are 4, N1=2, N2=4.
The reference transmission channel of selecting when wherein, described reference transmission channel carries out exterior ring power control for the exterior ring power control module.
Step 104: described equivalent result is outputed to the exterior ring power control module, be identified for the signal-to-noise target value of inner loop power control for described exterior ring power control module.
After the exterior ring power control module receives described equivalent result, calculate Block Error Rate according to described equivalent result, the Block Error Rate and the block error probability desired value that calculate are compared, obtain signal-to-noise target value, and signal-to-noise target value is outputed to the inner loop power control module; The inner loop power control module compares signal-to-noise ratio to predict value and signal-to-noise target value, obtains being used for the power control command word that power is adjusted, and sends to transmitting terminal; Transmitting terminal is adjusted transmitting power according to described power control command word, thereby has finished closed power control.
With reference to Fig. 2, the closed-loop power control device of the embodiment of the invention comprises: snr measurement module 10, low-pass filtering module 20, transmission block equivalent modules 30 and output module 40, wherein:
The received signal quality of 10 pairs of special bursts of snr measurement module is measured, in the present embodiment, the metric of signal quality is a signal to noise ratio, and the signal to noise ratio of the special burst that measures is stored, and simultaneously the special burst that receives is continuously counted.
Low-pass filtering module 20 is used for when the number of the special burst that receives continuously reaches first number, and the signal to noise ratio of described first number special burst correspondence is carried out low-pass filtering, obtains first signal to noise ratio.
If the number of the special burst that receives continuously reaches first number, then need to carry out the equivalent process of transmission block.Carry out the equivalence of transmission block if desired, then first number signal to noise ratio of continuous storage is carried out low-pass filtering, obtain first signal to noise ratio, all signal to noise ratios of storage are before this removed, and restarted the special burst that receives is continuously counted.Wherein, low-pass filtering is meant a plurality of signal to noise ratios is averaged or the weighted average processing; Described first number can be set as the case may be, for example, is set at 8 or 16.
If the number of the special burst that receives does not continuously reach first number, then, begin to receive normal transmission block, then judge the equivalent process that does not need to carry out transmission block, all signal to noise ratios of storage are removed, and, when beginning to receive special burst again, restart counting to the number zero clearing of the special burst that receives continuously.
Transmission block equivalent modules 30 is used for described first number special burst is carried out the transmission block equivalence, obtains equivalent result.
Wherein, when described first signal to noise ratio during greater than first thresholding, described equivalent result is for correctly receiving second number transmission block, and when described first signal to noise ratio was not more than described first thresholding, described equivalent result was that mistake receives second number transmission block.Described first thresholding can be set as the case may be, for example, is set at 6dB.
After the exterior ring power control module receives described equivalent result, calculate Block Error Rate according to described equivalent result, the Block Error Rate and the block error probability desired value that calculate are compared, obtain signal-to-noise target value, and signal-to-noise target value is outputed to the inner loop power control module; The inner loop power control module compares signal-to-noise ratio to predict value and signal-to-noise target value, obtains being used for the power control command word that power is adjusted, and sends to transmitting terminal; Transmitting terminal is adjusted transmitting power according to described power control command word, thereby has finished closed power control.
Above-mentioned closed-loop power control device also can comprise an equivalent number determination module (figure does not show).The transmission block number that described equivalent number determination module comprises according to first transformat is determined described second number, wherein, described first transformat is in the transformat combination of reference transmission channel correspondence, comprises the maximum transformat of transmission block number, and is specific as follows:
When the transmission block number that comprises when described first transformat is less than or equal to second thresholding, determine that described second number is 1;
The transmission block number that comprises when described first transformat is greater than described second thresholding, and when being less than or equal to the 3rd thresholding, determines that described second number is N1;
The transmission block number that comprises when described first transformat determines that described second number is N2 during greater than described the 3rd thresholding;
Wherein, described the 3rd thresholding is greater than described second thresholding, and N1, N2 are the integer greater than 1, and N2 is greater than N1.These values also can be set as the case may be, and for example, setting second thresholding is that 2, the three thresholdings are 4, N1=2, N2=4.
In sum, the present invention is by carrying out the transmission block equivalence to the special burst that receives, and equivalent result outputed to the exterior ring power control module, be identified for the signal-to-noise target value of inner loop power control for described exterior ring power control module, so, guaranteed the continuity of exterior ring power control, reduced the requirement of receiving terminal, thereby reduced the interference level of network integral body the transmitting terminal transmitted power.
Should be noted that at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spiritual scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (8)
1. a close-loop power controlling method is characterized in that, comprising:
The signal quality of the special burst that measurement receives;
When the number of the special burst that receives continuously reaches first number, the signal quality of described first number special burst correspondence is carried out low-pass filtering, obtain first signal quality;
Described first number special burst is carried out the transmission block equivalence, obtain equivalent result, wherein, when described first signal quality during greater than first thresholding, described equivalent result is for correctly receiving second number transmission block, when described first signal to noise ratio was not more than described first thresholding, described equivalent result was that mistake receives second number transmission block;
Described equivalent result is outputed to the exterior ring power control module, be identified for the signal-to-noise target value of inner loop power control for described exterior ring power control module.
2. close-loop power controlling method as claimed in claim 1 is characterized in that, also comprises:
Determine described second number according to the transmission block number that first transformat comprises, wherein, described first transformat is in the transformat combination of reference transmission channel correspondence, comprises the maximum transformat of transmission block number.
3. close-loop power controlling method as claimed in claim 2 is characterized in that, the described transmission block number that comprises according to first transformat is determined described second number, comprising:
When the transmission block number that comprises when described first transformat is less than or equal to second thresholding, determine that described second number is 1;
The transmission block number that comprises when described first transformat is greater than described second thresholding, and when being less than or equal to the 3rd thresholding, determines that described second number is N1;
The transmission block number that comprises when described first transformat determines that described second number is N2 during greater than described the 3rd thresholding;
Wherein, described the 3rd thresholding is greater than described second thresholding, and N1, N2 are the integer greater than 1, and N2 is greater than N1.
4. close-loop power controlling method as claimed in claim 1 is characterized in that:
Described signal quality is a signal to noise ratio.
5. a closed-loop power control device is characterized in that, comprising:
The snr measurement module is used to measure the signal quality of the special burst that receives;
Low-pass filtering module is used for when the number of the special burst that receives continuously reaches first number, and the signal quality of described first number special burst correspondence is carried out low-pass filtering, obtains first signal quality;
The transmission block equivalent modules, be used for described first number special burst is carried out the transmission block equivalence, obtain equivalent result, wherein, when described first signal quality during greater than first thresholding, described equivalent result is for correctly receiving second number transmission block, and when described first signal quality was not more than described first thresholding, described equivalent result was that mistake receives second number transmission block;
Output module is used for described equivalent result is outputed to the exterior ring power control module, is identified for the signal-to-noise target value of inner loop power control for described exterior ring power control module.
6. closed-loop power control device as claimed in claim 5 is characterized in that, also comprises:
Equivalence number determination module, the transmission block number that is used for comprising according to first transformat is determined described second number, wherein, described first transformat is in the transformat combination of reference transmission channel correspondence, comprises the maximum transformat of transmission block number.
7. closed-loop power control device as claimed in claim 6 is characterized in that, described equivalent number determination module is further used for:
When the transmission block number that comprises when described first transformat is less than or equal to second thresholding, determine that described second number is 1;
The transmission block number that comprises when described first transformat is greater than described second thresholding, and when being less than or equal to the 3rd thresholding, determines that described second number is N1;
The transmission block number that comprises when described first transformat determines that described second number is N2 during greater than described the 3rd thresholding;
Wherein, described the 3rd thresholding is greater than described second thresholding, and N1, N2 are the integer greater than 1, and N2 is greater than N1.
8. closed-loop power control device as claimed in claim 5 is characterized in that:
Described signal quality is a signal to noise ratio.
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| CN2010102913139A CN101945421A (en) | 2010-09-25 | 2010-09-25 | Closed-loop power control method and device |
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| CN2010102913139A CN101945421A (en) | 2010-09-25 | 2010-09-25 | Closed-loop power control method and device |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2001001604A1 (en) * | 1999-06-28 | 2001-01-04 | Qualcomm Incorporated | Method and apparatus for controlling transmission energy in a communication system employing orthogonal transmit diversity |
| CN1650540A (en) * | 2002-03-14 | 2005-08-03 | 高通股份有限公司 | Method and apparatus for reducing inter-channel interference in a wireless communication system |
| CN1983849A (en) * | 2006-05-09 | 2007-06-20 | 华为技术有限公司 | Method for controlling channel power |
| CN101437282A (en) * | 2008-12-19 | 2009-05-20 | 普天信息技术研究院有限公司 | Method and apparatus for controlling external loop power of combined business |
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2010
- 2010-09-25 CN CN2010102913139A patent/CN101945421A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001001604A1 (en) * | 1999-06-28 | 2001-01-04 | Qualcomm Incorporated | Method and apparatus for controlling transmission energy in a communication system employing orthogonal transmit diversity |
| CN1650540A (en) * | 2002-03-14 | 2005-08-03 | 高通股份有限公司 | Method and apparatus for reducing inter-channel interference in a wireless communication system |
| CN1983849A (en) * | 2006-05-09 | 2007-06-20 | 华为技术有限公司 | Method for controlling channel power |
| CN101437282A (en) * | 2008-12-19 | 2009-05-20 | 普天信息技术研究院有限公司 | Method and apparatus for controlling external loop power of combined business |
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Application publication date: 20110112 |