CN101909351A - Method for setting power control step length based on path loss model estimation - Google Patents
Method for setting power control step length based on path loss model estimation Download PDFInfo
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- CN101909351A CN101909351A CN 201010231043 CN201010231043A CN101909351A CN 101909351 A CN101909351 A CN 101909351A CN 201010231043 CN201010231043 CN 201010231043 CN 201010231043 A CN201010231043 A CN 201010231043A CN 101909351 A CN101909351 A CN 101909351A
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Abstract
The invention and the embodiment thereof all disclose a method for setting a power control step length based on path loss model estimation, comprising the following steps: utilizing estimation on the relationship between path losses and distances of wireless transceiving equipment to obtain the sensitivity of the path losses relative to the distance variation, adopting larger power to control the step length if the sensitivity is higher so as to facilitate faster power control, and otherwise, adopting smaller power to control the step length.
Description
Technical field
The present invention relates to the method that the equipment transmitting power is provided with in the radio communication, particularly the method to set up of the step-length of power lift adjustment in the power control.
Background technology
In radio communication, particularly in the mobile communication, communicating by letter between the mobile device or between mobile device and other equipment can be subjected to the influence of path loss and interference etc.For the influence of the path loss that remedies variation or interference and reduce interference, adopt power control that transmitting power is adjusted usually to other receivers.
Wherein, closed power control is a kind of mechanism of receiving equipment according to the signal quality control transmitter transmitting power that receives, if receiving equipment is found the signal quality deficiency, then notify transmitting terminal to improve transmitting power, otherwise then notify it to reduce transmitting power with a fixed step size with a fixed step size.The size of this step-length is relevant with the variation severe degree situation of received signal usually, and it is strong to change Shaoxing opera, and then step-length is big more.The severe degree that this received signal changes is main relevant with the variation severe degree of path loss, and it has been generally acknowledged that the relative moving speed of reception or transmitter is big more, and it is strong that it changes Shaoxing opera.
Poor (is unit with decibel dB) of the average power of path loss available transmission and the average power of reception defines, general receiving-transmitting sides distance is big more, its value is big more, barrier distributes intensive more between the receiving-transmitting sides, its value is also big more, for example: under the situation that air line distance is identical between the receiving-transmitting sides, when blocking when having sight line and by barrier, the former path loss is littler.And the barrier between the receiving-transmitting sides distributes under the intensive more situation, path loss with the increase of distance himself also increase fast more, in other words, path loss is adjusted the distance more responsive in this case.Therefore, if the sensitivity adjustment that the step-length of power control can be adjusted the distance according to path loss will help to improve the performance of power control.
Summary of the invention
The objective of the invention is: a kind of method for setting power control step length of estimating based on path loss model is provided, it can be provided with power control step-size with respect to the sensitivity of distance between the transceiver according to path loss, is controlled at performance under the different radio environment thereby help to improve power.
According to purpose of the present invention, the method for setting power control step length that is proposed based on the path loss model estimation, its basic principle is: at wireless device receiving-transmitting sides (being recipient and emission side), utilization is to the estimation of path loss between the two, and introduce the estimation of distance between the two, judge the sensitivity that path loss is adjusted the distance, thus the step-length that power is controlled when adjusting emission side and launching.
The specific implementation step of the method that proposes among the present invention comprises:
Step 1: receiving-transmitting sides is appointed initial power control step-size.
Step 2: receiving-transmitting sides transmits and receives the poor of indexs such as power or level by measurement, estimate path loss.
Step 3: receiving-transmitting sides multiply by the light velocity by the time delay of the transmission of measurement one way signal, estimates the distance of signal transmission process.
Step 4: emission side or recipient judge the relation of path loss and distance, estimate the rate of change of path loss with distance.
Step 5: the rate of change absolute value that step 4 draws is big more, and it is big more that new power control step-size then is provided with, otherwise then more little, and the end value of the step-length that this is new is no more than certain bound scope.
Step 6: but the execution of above step periodic also can be carried out according to the needs of debit or originating party.
Embodiment
Be example with the cellular mobile telephone network that now widely uses, this network or the user that system served use transportable equipment usually, as mobile phone or portable card of surfing Internet, they are the base station access communications network by closing on it in different time and locus, the framework that this can be described as very the typical case and has general applicability, here select up link (being also referred to as reverse link), be that mobile device is transmitted into the link that the base station receives, set forth the method for setting power control step length based on the path loss model estimation proposed by the invention with this.
Certainly, application of the present invention is not limited to cellular mobile telephone network, is equally applicable to the system that other have wireless transmitting-receiving equipments, in other words, generally is suitable for for all application scenarios with essential characteristic among this embodiment.Basic step among this embodiment is as follows:
Step 1: mobile device and base station set initial power control step-size, for example 1 decibel (dB) communicating by letter with setting up in the process.
Step 2: mobile device and base station are in communication process, and the power of the mobile device of its reception of measurement is passed through in the base station, and in conjunction with the transmitting power that mobile device is reported, utilizes both differences to estimate path loss.
Step 3: mobile device and base station are in communication process, and the time delay of the signal of the mobile device emission of base station by measuring its reception multiply by the light velocity with this time delay, estimate signal from be transmitted into reception the distance of process.
Step 4: the base station utilizes the distance between path loss estimated in step 2 and the step 3 and the transmitting-receiving, will with decibel (dB) be the path loss of unit divided by distance, estimate the rate of change of path loss with distance.
Step 5: the rate of change absolute value that step 4 draws is big more, it is big more that new power control step-size then is provided with, otherwise it is then more little, for example: the rate of change absolute value is more than or equal to 4, then new power control step-size is set to 1.5dB, if the rate of change absolute value is less than 2, then new power control step-size is set to 0.5dB, otherwise it is constant to keep 1dB.The base station is with the power control step-size notice mobile device that upgrades, and mobile device will raise or reduction power according to new power control step-size afterwards.
Step 6: above step can be configured in the process of communication and regularly carries out, and for example carries out once every 2 seconds; Also can carry out according to the needs of debit or originating party.
As can be seen, the method for setting power control step length of estimating based on path loss model that the present invention proposes has following characteristics more than comprehensive:
1, path loss is introduced in the setting up procedure of power control step-size influence for the sensitivity of distance between the transmitting-receiving with the different path loss model of better reply;
2, need not to change the hardware of existing device, backward compatibility.
Claims (6)
1. method for setting power control step length of estimating based on path loss model, raise when this method is controlled the wireless device transmitting power or reduce the step-length of adjusting and be provided with, consider when being provided with that path loss is with respect to the degree of both sides' distance sensitive between recipient and the emission side, this method comprises the following steps:
Step 1: recipient and emission side both sides appoint initial power control step-size;
Step 2: recipient and emission side both sides transmit and receive the poor of the difference of power or launching electrical level and incoming level index by measurement, estimate path loss;
Step 3: recipient and emission side both sides be multiply by the light velocity by the time delay of the transmission of measurement one way signal, estimate the distance of signal transmission process;
Step 4: emission side or recipient judge the relation of path loss and distance, estimate the rate of change of path loss with distance;
Step 5: the rate of change absolute value that step 4 draws is big more, and it is big more that new power control step-size then is provided with, otherwise then more little, and the end value of the power control step-size that this is new is no more than certain bound scope;
Step 6: but the execution of above step periodic also can be carried out according to the needs of recipient or emission side.
2. the method for setting power control step length of estimating based on path loss model described in claim 1, it is characterized in that the step-length setting that rising or reduction are adjusted during power control will consider that path loss is with respect to the degree of distance sensitive between recipient and the emission side.
3. the method for setting power control step length of estimating based on path loss model described in claim 1, it is characterized in that, emission side or recipient further estimate the rate of change of path loss with distance according to resulting path loss estimated result and signal transmission distance estimated result.
4. the method for setting power control step length of estimating based on path loss model described in claim 1, it is characterized in that, emission side or recipient estimate between them behind the rate of change of path loss with distance, if this rate of change absolute value is big more, it is big more that new power control step-size then is provided with, otherwise then more little.
5. the method to set up of the power control step-size described in claim 4 is characterized in that, the end value of the power control step-size of renewal is no more than certain bound scope.
6. the method for setting power control step length of estimating based on path loss model described in claim 1, it is characterized in that, can carry out according to certain cycle based on the execution that the power of path loss model is controlled, also carry out according to the needs of recipient or emission side.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010231043 CN101909351A (en) | 2010-07-20 | 2010-07-20 | Method for setting power control step length based on path loss model estimation |
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| CN 201010231043 CN101909351A (en) | 2010-07-20 | 2010-07-20 | Method for setting power control step length based on path loss model estimation |
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| CN101909351A true CN101909351A (en) | 2010-12-08 |
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| CN 201010231043 Pending CN101909351A (en) | 2010-07-20 | 2010-07-20 | Method for setting power control step length based on path loss model estimation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012088845A1 (en) * | 2010-12-30 | 2012-07-05 | 中兴通讯股份有限公司 | Method and device for transmitting data and radio remote unit |
| CN103139886A (en) * | 2011-12-05 | 2013-06-05 | 中兴通讯股份有限公司 | Method for controlling transmitted power and base station controller |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1263388A (en) * | 1999-11-12 | 2000-08-16 | 深圳市中兴通讯股份有限公司 | Method for controlling baseband gain treatment by using WCDMA closed-loop power |
| CN1479541A (en) * | 2003-07-25 | 2004-03-03 | 大唐移动通信设备有限公司 | TDD CDMA system power control method and device |
| CN1642033A (en) * | 2004-01-01 | 2005-07-20 | 华为技术有限公司 | Forward power control method for CDMA system |
-
2010
- 2010-07-20 CN CN 201010231043 patent/CN101909351A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1263388A (en) * | 1999-11-12 | 2000-08-16 | 深圳市中兴通讯股份有限公司 | Method for controlling baseband gain treatment by using WCDMA closed-loop power |
| CN1479541A (en) * | 2003-07-25 | 2004-03-03 | 大唐移动通信设备有限公司 | TDD CDMA system power control method and device |
| CN1642033A (en) * | 2004-01-01 | 2005-07-20 | 华为技术有限公司 | Forward power control method for CDMA system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012088845A1 (en) * | 2010-12-30 | 2012-07-05 | 中兴通讯股份有限公司 | Method and device for transmitting data and radio remote unit |
| CN103139886A (en) * | 2011-12-05 | 2013-06-05 | 中兴通讯股份有限公司 | Method for controlling transmitted power and base station controller |
| CN103139886B (en) * | 2011-12-05 | 2018-06-08 | 中兴通讯股份有限公司 | A kind of method and base station controller for controlling transmission power |
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Application publication date: 20101208 |