CN1691533A - A power control method - Google Patents
A power control method Download PDFInfo
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- CN1691533A CN1691533A CN 200410032771 CN200410032771A CN1691533A CN 1691533 A CN1691533 A CN 1691533A CN 200410032771 CN200410032771 CN 200410032771 CN 200410032771 A CN200410032771 A CN 200410032771A CN 1691533 A CN1691533 A CN 1691533A
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Abstract
The invention discloses a method for power controlling, comprising: measuring the Block Error Rate (BLER)/Frame Error Rate (FER) of the signal of the physical data channel, comparing the measured BLER/FER with the intended target BLER/FER and adjusting the current target Bit Error Rate according to the comparing results; measuring the signal BER of the physical controlling channel, comparing the measured BER with the current target BER and adjusting the current target Signaling Intertrace Rate (SIR) according to the comparing result; and measuring the SIR of the physical channel and comparing it with the current target SIR and confirming the Transmission Power Controlling (TPC) command according to the comparing result.
Description
Technical field
The present invention relates to a kind of Poewr control method.
Background technology
In mobile communication system, power control is used to control the transmitting power of travelling carriage or base station, under the prerequisite of the telecommunication service quality that guarantees customer requirements, at utmost reduce transmitting power, make transmitting power just can satisfy the requirement of proper communication, can not waste too much power again, can also increase power system capacity, reduce interference other travelling carriages.
In Wideband Code Division Multiple Access (WCDMA) (WCDMA) system, power control comprises: inner loop power control and exterior ring power control.The main effect of inner loop power control is the transmitting power by the control physical channel, makes measurement signal interference ratio (SIR) converge on target SIR.The WCDMA system is that the ratio (Eb/No) by the bit energy estimating to receive and interference power spectrum density sends corresponding power adjustment commands, and Eb/No and SIR have certain corresponding relation.Exterior ring power control is by dynamically adjusting the target SIR of inner loop power control, communication quality is met the demands all the time, promptly reaching Block Error Rate/frame error rate/bit error rate (BLER/FER/BER) value of regulation.Because the complexity of wireless channel, only carry out power control and can not really reflect link-quality according to sir value, such as, for stationary user, low speed user and highspeed user, on the basis that guarantees identical FER, requirement to SIR is different, and final communication quality is weighed by BLER/FER, therefore is necessary dynamically to adjust target SIR according to the BLER/FER/BER value of reality.
Fig. 1 is a prior art WCDMA system power control principle schematic diagram, comprising: exterior ring power control 11 and inner loop power are controlled 12 two parts.Wherein, each the road signal in the multipath of communication receiver (RAKE) the receiver receiving multipath signals, and each road signal diversifying combined; Then channel signal is decoded, from the signal that receives, obtain the information sequence that information source sends.WCDMA exterior ring power control 11 is exactly after channel-decoding, measure by BLER/FER business datum, obtain the BLER/FER measured value, and BLER/FER measured value and target BLER/FER compared, dynamically adjust inner loop power according to comparative result then and control 12 required target SIR.WCDMA inner loop power control 12 is by receiving terminal measured SIR and exterior ring power control 11 target SIR that provide are compared, and determine transmitting power control (TPC) order according to comparative result, then the TPC order is sent to transmitting terminal to adjust the size of transmitting power.
Based on power control structure shown in Figure 1, as shown in Figure 2, the prior art Poewr control method may further comprise the steps:
Step 201～202, communication receiver are decoded to channel signal, and the BLER/FER of business datum is measured, and obtain the BLER/FER measured value; Target BLER/FER with professional regulation compares with the BLER/FER measured value, and dynamically adjusts target SIR according to comparative result.Here, communication receiver refers to user side or network side communication entity.
Wherein, the method for target SIR being adjusted according to the comparative result of BLER/FER measured value and target BLER/FER can be like this: if the BLER/FER measured value, then improves predetermined step-length of target SIR greater than target BLER/FER; If the BLER/FER measured value, then reduces predetermined step-length of target SIR less than target BLER/FER.The value of predetermined step-length is to be determined by the speed of power regulating and controlling and required precision.In addition, also can adjust target SIR according to comparative result and the mapping relations between the target SIR of predefined BLER/FER measured value and target BLER/FER.
Step 203～204, the signal power measurement SIR that receives according to receiving terminal obtain the sir measurement value; Sir measurement value and target SIR are compared, determine the TPC order, and the TPC order is sent to transmitting terminal to adjust the size of transmitting power according to comparative result.
Wherein, the initial value of target BLER/FER and target SIR is to require to be provided with according to different communication service qualities.
Wherein, step 201～202 and step 203～204 can be carried out according to random order.
From said process as can be seen, in the prior art, when communication link loaded service quality requirement is very high, just when target BLER/FER is very little, because target BLER/FER is very little, BLER/FER just requires very long measuring period, such as: if BLER/FER is 10-6, then need to measure 106 data blocks or Frame at least, this just requires very long Measuring Time, therefore, target SIR can not in time be adjusted according to the quick variation of radio communication.And, communication link service data transmission and control information, just the transmission quality of business datum is measured and measure BLER/FER, when the discontinuous transmission of communication link loaded service data, will cause in business datum is suspended the time that sends, can't measuring the BLER/FER of business datum, that is to say BLER/FER measured value non-availability, therefore, just can't dynamically adjust target SIR according to the comparative result of BLER/FER measured value and target BLER/FER, exterior ring power control just can not normally be carried out, and the power control of whole system also just can not effectively be carried out.Because final communication quality is weighed by BLER/FER, so also just can't guarantee the final communication service quality of customer requirements.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of Poewr control method, it can effectively be carried out when the discontinuous emission of user service data in guaranteed output control, and can in time adjust target SIR when target BLER/FER is very little.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention discloses a kind of Poewr control method, this method comprises:
Measure the BLER/FER of physical data channel signal, measured BLER/FER and predetermined target BLER/FER are compared, and adjust current target BER according to comparative result;
Measure the physical control channel signal BER, measured BER and current target BER are compared, and adjust current target SIR according to comparative result; And
Measure the SIR of physical channel, measured SIR and current target SIR are compared, and send the TPC order according to comparative result.
Before the BLER/FER that measures the physical data channel signal, this method also comprises: the physical data channel signal is decoded.
In the such scheme, described adjustment current target BER can for: if measured BLER/FER is higher than target BLER/FER, then reduce target BER; If measured BLER/FER is lower than target BLER/FER, the target that then raises BER.Described reduction or rising target BER can for: target BER is reduced or the predetermined step-length that raises.
In addition, this method can also comprise: the initial value that requires to be provided with target BER according to different communication service qualities.
Before measuring the physical control channel signal BER, this method also comprises: the physical control channel signal is decoded.
In the such scheme, described adjustment current target SIR can for: if measured BER is higher than target BER, target SIR then raises; If measured BER is lower than target BER, then reduce target SIR.Described rising or reduce target SIR can for: target SIR raise or reduce a predetermined step-length.
By such scheme as can be seen, key of the present invention is: increased a controlling unit between inner loop power control and exterior ring power control, BER to the control information of continuous emission on the physical control channel measures, and uses the BER of physical control channel to adjust target SIR as the intermediate controlled variable.
Therefore, this Poewr control method provided by the present invention, by measuring the BER of the control information of launching continuously on the physical control channel, and dynamically adjust target SIR according to the comparative result of BER that records and target BER, guaranteed effectively to carry out when power is controlled at the discontinuous emission of user service data.And, very high in operation quality requirement, be that target BLER/FER is when very low, in short Measuring Time, just can obtain the BER measured value, and then can in time adjust target SIR, therefore, the inventive method can reflect the quick variation of radio communication better, makes power control can adapt to more complicated service situation.
Description of drawings
Fig. 1 is a prior art WCDMA system power control principle schematic diagram;
Fig. 2 is prior art Poewr control method realization flow figure;
Fig. 3 is a power control principle schematic diagram of the present invention;
Fig. 4 is Poewr control method realization flow figure of the present invention.
Embodiment
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
The present invention adopts three grades of power control mechanisms, between inner loop power control and exterior ring power control, increase a controlling unit, BER to the control information of continuous emission on the physical control channel measures, and uses the BER of physical control channel to adjust target SIR as the intermediate controlled variable.
Fig. 3 is a power control principle schematic diagram of the present invention, and this power control structure comprises that three link: target BER adjust link 31, target SIR adjusts link 32 and transmitting power is adjusted link 33.Wherein, it is by communication receiver the service signal of physical data channel to be decoded that BER adjusts link 31, measure BLER/FER, obtain the BLER/FER measured value, then the target BLER/FER of BLER/FER measured value with professional regulation compared, and dynamically adjust target SIR according to comparative result and adjust the required target BER of link 32.
It is by communication receiver the control signal of physical control channel to be decoded that target SIR is adjusted link 32, measure or estimate the BER of physical control channel, obtain the BER measured value, the target BER that then BER measured value and target BER being adjusted link 31 provides compares, and dynamically adjusts transmitting power according to comparative result and adjust the required target SIR of link 33.Target SIR is adjusted link 32 and can be carried out at the RNC of network side or base station (Node B) or user side.
It is exactly inner loop power control shown in Figure 1 that transmitting power is adjusted link 33, its operation principle is identical with inner loop power control, concrete is exactly by receiving terminal measured SIR and the target SIR that target SIR adjustment link 32 provides are compared, and determine TPC order according to comparative result, then the TPC order is sent to transmitting terminal to adjust the size of transmitting power.
Based on above-mentioned power control structure, as shown in Figure 4, Poewr control method of the present invention may further comprise the steps:
Step 401～402, communication receiver are decoded to the physical data channel service signal, measure the BLER/FER of physical data channel signal, obtain the BLER/FER measured value, compare BLER/FER measured value and the professional target BLER/FER that stipulates, and dynamically adjust current target BER according to comparative result.Wherein, the initial value of target BER is to require to be provided with according to different communication service qualities.
In the present embodiment,, then reduce predetermined step-length of target BER if the BLER/FER measured value is higher than target BLER/FER, if the BLER/FER measured value is lower than target BLER/FER, predetermined step-length of the target that then raises BER.Wherein, the value of predetermined step-length is by the speed of power regulating and controlling and required precision decision.
In addition, also can dynamically adjust current target BER according to the comparative result of predefined BLER/FER measured value and target BLER/FER and the mapping relations between the target BER.
Step 403～404, communication receiver are decoded to the physical control channel signal, measure the physical control channel signal BER, obtain the BER measured value, compare BER measured value and current target BER, and dynamically adjust current target SIR according to comparative result.
In the present embodiment, if the BER measured value is higher than target BER, predetermined step-length of the target SIR that then raises if the BER measured value is lower than target BER, then reduces predetermined step-length of target SIR.
In addition, can also dynamically adjust current target SIR according to comparative result and the mapping relations between the target SIR of predefined BER measured value and target BER.
Step 405～406, communication receiver are measured the SIR of physical channel, obtain the sir measurement value, then sir measurement value and current target SIR are compared, and determine the TPC order, then the TPC order is sent to transmitting terminal to adjust transmitting power according to comparative result.
Wherein, step 401～402, step 403～404 and step 405～406 can be carried out according to random order.
By above-mentioned power control process as can be seen, when target BLER/FER is very little, because data block or Frame normally are made up of the lot of data bit, thereby the Measuring Time of BER is shorter than the Measuring Time of BLER/FER, therefore, compare by measurement BER and target BER, can in time adjust target SIR, power control is effectively carried out physical control channel.When the discontinuous transmission of business datum, though can't adjust target SIR, can adjust target SIR by measuring BER by measuring BLER/FER, therefore can guaranteed output control effectively carry out.
The inventive method can also be applied in the power control of code division multiple access (CDMA) and CDMA2000 mobile communication system, and its power control principle is identical with said method.
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 (8)
1, a kind of Poewr control method is characterized in that, this method comprises:
Measure the Block Error Rate/frame error rate BLER/FER of physical data channel signal, measured BLER/FER and predetermined target BLER/FER are compared, and adjust current target bit error rate BER according to comparative result;
Measure the physical control channel signal BER, measured BER and current target BER are compared, and adjust current target signal interference ratio SIR according to comparative result; And
Measure the SIR of physical channel, measured SIR and current target SIR are compared, and send transmitting power control TPC order according to comparative result.
2, method according to claim 1 is characterized in that, before the BLER/FER that measures the physical data channel signal, this method also comprises: the physical data channel signal is decoded.
3, method according to claim 1 is characterized in that, described adjustment current target BER is: if measured BLER/FER is higher than target BLER/FER, then reduce target BER; If measured BLER/FER is lower than target BLER/FER, the target that then raises BER.
4, method according to claim 3 is characterized in that, described reduction or rising target BER are: target BER is reduced or the predetermined step-length that raises.
5, according to each described method of claim 1 to 4, it is characterized in that this method also comprises: the initial value that requires to be provided with target BER according to different communication service qualities.
6, method according to claim 1 is characterized in that, before measuring the physical control channel signal BER, this method also comprises: the physical control channel signal is decoded.
According to claim 1 or 6 described methods, it is characterized in that 7, described adjustment current target SIR is: if measured BER is higher than target BER, target SIR then raises; If measured BER is lower than target BER, then reduce target SIR.
8, method according to claim 7 is characterized in that, described rising or reduce target SIR and be: target SIR is raise or reduce a predetermined step-length.
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| CN 200410032771 CN1691533A (en) | 2004-04-21 | 2004-04-21 | A power control method |
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| CN 200410032771 CN1691533A (en) | 2004-04-21 | 2004-04-21 | A power control method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100388644C (en) * | 2006-01-24 | 2008-05-14 | 中兴通讯股份有限公司 | Method of uplink power control during discontinuous uplink emission in radio communication system |
| CN100407593C (en) * | 2006-01-24 | 2008-07-30 | 中兴通讯股份有限公司 | Method of downlink power control during discontinuous downlink emission in radio communication system |
| CN1852063B (en) * | 2006-01-23 | 2010-05-12 | 华为技术有限公司 | Method for judging power control effect and apparatus |
| CN1937441B (en) * | 2006-09-29 | 2011-08-10 | 华为技术有限公司 | Power control method |
| WO2011160529A1 (en) | 2010-06-21 | 2011-12-29 | 中兴通讯股份有限公司 | Outer loop power control method and device |
| CN101345558B (en) * | 2007-07-09 | 2012-02-22 | 大唐移动通信设备有限公司 | Method and device for controlling ascending exterior ring power |
| CN101754340B (en) * | 2008-12-18 | 2013-01-30 | 展讯通信（上海）有限公司 | Method for determining target signal-to-interference ratio in outer loop power control and receiving end |
| WO2014205828A1 (en) * | 2013-06-29 | 2014-12-31 | 华为技术有限公司 | Power control method, apparatus and system |
| CN104837192A (en) * | 2014-02-12 | 2015-08-12 | 鼎桥通信技术有限公司 | Load-based power control method and device |
| WO2016082647A1 (en) * | 2014-11-27 | 2016-06-02 | 华为技术有限公司 | Method and apparatus for determining transmission power |
-
2004
- 2004-04-21 CN CN 200410032771 patent/CN1691533A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1852063B (en) * | 2006-01-23 | 2010-05-12 | 华为技术有限公司 | Method for judging power control effect and apparatus |
| CN100407593C (en) * | 2006-01-24 | 2008-07-30 | 中兴通讯股份有限公司 | Method of downlink power control during discontinuous downlink emission in radio communication system |
| CN100388644C (en) * | 2006-01-24 | 2008-05-14 | 中兴通讯股份有限公司 | Method of uplink power control during discontinuous uplink emission in radio communication system |
| CN1937441B (en) * | 2006-09-29 | 2011-08-10 | 华为技术有限公司 | Power control method |
| CN101345558B (en) * | 2007-07-09 | 2012-02-22 | 大唐移动通信设备有限公司 | Method and device for controlling ascending exterior ring power |
| CN101754340B (en) * | 2008-12-18 | 2013-01-30 | 展讯通信（上海）有限公司 | Method for determining target signal-to-interference ratio in outer loop power control and receiving end |
| WO2011160529A1 (en) | 2010-06-21 | 2011-12-29 | 中兴通讯股份有限公司 | Outer loop power control method and device |
| WO2014205828A1 (en) * | 2013-06-29 | 2014-12-31 | 华为技术有限公司 | Power control method, apparatus and system |
| CN104488200A (en) * | 2013-06-29 | 2015-04-01 | 华为技术有限公司 | Power control method, apparatus and system |
| US10129833B2 (en) | 2013-06-29 | 2018-11-13 | Huawei Technologies Co., Ltd. | Power control method, apparatus, and system |
| CN104837192A (en) * | 2014-02-12 | 2015-08-12 | 鼎桥通信技术有限公司 | Load-based power control method and device |
| WO2016082647A1 (en) * | 2014-11-27 | 2016-06-02 | 华为技术有限公司 | Method and apparatus for determining transmission power |
| US10021653B2 (en) | 2014-11-27 | 2018-07-10 | Huawei Technologies Co., Ltd. | Transmit power determining method and apparatus |
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