CN1172383A - 流动台发射功率的控制方法 - Google Patents
流动台发射功率的控制方法 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
- H04W52/225—Calculation of statistics, e.g. average, variance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/06—TPC algorithms
- H04W52/08—Closed loop power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/146—Uplink power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/245—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account received signal strength
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
- H04W52/50—TPC being performed in particular situations at the moment of starting communication in a multiple access environment
Abstract
一种控制与基地台进行无线电通信的流动台的发射功率的方法,包括下列步骤:用通信过程中预定时间内收到的功率强度平均值、根据基地台发送的信息包分析出的基地台发射功率、和根据基地台所要求的接收中功率确定的发射功率调节流动台的发射功率。
Description
本发明涉及与基地台进行无线电通信的流动台,更具体地说,涉及控制流动台发射功率的一种方法。
在一般的流动台中,虽然接收中的功率随流动位置的不同而异,但为与基地台进行通信进行的初始准备工作期间发射功率是保持不变的。因此一般流动台有达不到最佳通信状态的问题。
本发明的目的是提供一种计算流动台在预定时间内收到的接收功率平均值的方法。
本发明的另一个目的是提供一种在通信初始工作期间确定流动台发射功率的方法。
本发明还有另一个目的,即提供一种初始准备工作之后自动控制发射功率的方法。
按照本发明的一个特征,本发明提供的流动台与基地台进行无线电通信时发射功率的控制方法包括下列步骤;用通信过程中预定时间内收到的功率大小平均值,根据基地台发送的信息包分析出的基地台发射功率,和根据基地台要求的接收功率确定的发射功率调节流动台的发射功率。
下面参看附图更具体地说本发明的内容。
结合附图参阅下面的详细说明可以更好更全面地理解本发明及其附带的许多优点。附图中,同样的编号表示同样或类似的元件其中:
图1是本发明的结构方框图;
图2是本发明计算接收中功率的平均值的流程图;
图3是本发明计算发射功率的流程图。
参看图1。无线电信号通过天线2接收下来之后由射频(RF)放大器4加以放大,放大后的信号由第一混频器8将其与第一本机振荡器6振荡的信号混合,产生第一中频(IF)信号。第一中频信号由第二混频器12将其与第二本机振荡器20振荡的信号混合,产生第二中频信号。第二中频信号由中频放大器14加以放大,经放大的第二中频信号的振幅由限幅器16限幅。一般说来,限幅器16产生的信号提供给用户。对数放大器18将中频放大器14和限幅器16产生的信号的当前量值转换成直流(DC)电压DV。控制器22用DC电压DV测定流动台收到的电流强度指示(RSSI)值。控制器22通过测定RSSI值确定发射功率并产生控制信号CONT供控制发射功率。
图2示出了确定RSSI值的控制流程图。参照看图2,其中包括下列步骤:读取预定时间(100毫秒)内收到的RSSI值,并将收到的RSSI值转换成功率单位;累加功率转换值;计算预定时间(2秒)内累加功率的平均值。
图3示出了确定发射功率的控制流程图。参看图3,其中包括下列步骤:若流动台处于准备工作状态,则将流动台的发射功率调到初始值;若准备工作结束,则将流动台的发射功率与先前预定时间(2秒)内的发射功率相比较,再按变化幅度调整发射功率。
现在参看图2详细说明求接收中功率平均值的一系列步骤。
在步骤210,控制器22将计数值置“0”以便在预定时间(2秒)内计出预定时间(100毫秒)的计数值,例如20,在步骤212,控制器22核实内部计时器来核实预定(100毫秒)是否已过。若预定时间已过,控制器22在步骤214读取RSSI值。RSSI值由对数放大器18提供。在步骤216,控制器22将RSSI值转换成功率单位。
下面的表1表示出了对数放大器18产生的DC电压DV相应的功率值。
表1
DC电压(DV)[伏] | 功率单位[毫瓦分贝] |
0.5 | -120 |
1.0 | -110 |
1.5 | -100 |
2.0 | -90 |
2.5 | -80 |
3.0 | -70 |
3.5 | -60 |
4.0 | -50 |
4.5 | -40 |
5.0 | -30 |
5.0 | -20 |
5.0 | -10 |
在步骤218,转换成的功率单位累加到所述预定时间之前的相应值,并将相加得出的功率单位PRSSI_READ存入临时缓存器中。在步骤220,控制器22核实计数值n是否小于19,以确定预定时间(2秒)是否已过。若未过,则控制器22在步骤224令计数值增加1,然后返回到步骤212。若计数值大于或等于19,即预定时间(2秒)已过,控制器22就在步骤222将累存在临时缓存器中的接收功率PRSSI_READ用20除。
接收功率的平均值可用下式表示:
PRSSI=PRSSI_READ/20
计算出的平均值存入临时缓存器中。整个过程如图2所示,这是在2秒(100毫秒×20)的时间内进行的。
现在参看图3说明确定发射功率的一系列步骤。在步骤310,控制器22核实流动台是否处于通信初始准备状态。通信初始是指为与基地台通信而进行的初始准备工作。若流动台处于通信初始准备状态,控制器22就在步骤318确定初始发射功率。发射功率用下式求出:
PMTX=PRTX-PRSSI+PREF
其中PMTX为流动台的发射功率,PRTX为基地台的发射功率,PRSSI为流动台接收功率,PREF为基地台要求的接收功率。通常,若BER(误码率)为10-4,则RREF等于-105毫瓦分贝。
控制器22核实通信初始准备步骤是否在预定的时间(2秒)进行。若准备步骤完毕,控制器22就在步骤312计算准备步骤之后的发射功率。计算式与初始发射功率的计算式相同。但接收中功率的平均值PRSSI是个变化值。
若流动台的发射功率已确定,控制器22就在步骤314和316将求出的发射功率PMTX与预定时间(2秒)之前的发射功率PMTX-2相比较。若比较得出的发射功率变化范围大于设定范围(1.5毫瓦分贝),即若PMTX>PMTX-2+1.5[毫瓦分贝],则步骤314之后就进入步骤320,使流动台的发射功率增加3毫瓦分贝(PMTX=PMTX-2+3[毫瓦分贝])。若变化范围小于设定范围(1.5毫瓦分贝),即若PMTX>PMTX-2-1.5[毫瓦分贝],则步骤316就往前进入步骤324,使发射功率PMTX减少3毫瓦分贝(PMTX=PMTX-2-3[毫瓦分贝])。
若发射功率在预定时间(2秒)内的变化范围在-1.5毫瓦分贝至+1.5毫瓦分贝的范围,控制器22就在步骤322保持预定时间(2秒)之前的发射功率值。
综上所述,在初始准备步骤,控制器在某一时刻改变发射功率。初始准备步骤完毕之后,发射功率分阶段改变。这样,由于通信所需的发射功率是自动控制的,因而提高了通信效率。
应该理解的是,本发明并不局限于这里作为本发明的最佳实施例公开的特殊实施例,更确切地说,本发明不局限于本说明书中所述的具体实施例,但所附权利要求书中的例外。
Claims (9)
1.一种控制与基地台进行无线电通信的流动台的发射功率的方法,其特征在于,它包括下列步骤:
用通信过程中在预定时间内收到的功率平均值,根据基地台发送的信息包分析出的所述基地台发射功率,和根据所述基地台要求的接收功率确定的发射功率调节所述流动台的发射功率。
2.如权利要求1所述的方法,其特征在于,所述收到的功率强度的平均值是将在预定时间设定值内收到的功率强度值的和用所述设定值除求出的。
3.如权利要求2所述的方法,其特征在于,若在进行通信初始准备步骤,则所述流动台的发射功率是通过从所述基地台的所述发射功率与所述基地台所要求的接收功率的和减去所述收到的功率强度平均值求出的。
4.如权利要求3所述的方法,其特征在于,所述流动台的所述发射功率通过下列步骤求出:
(a)若通信初始准备步骤结束,则从所述基地台的所述发射功率与所述基地台所要求的接收功率的和减去所述收到的功率强度平均值;
(b)将通过所述步骤(a)求出的发射功率与所述预定时间之前求出的发射功率相比较,再根据比较得出的变化范围调节所述流动台的所述发射功率。
5.如权利要求4所述的方法,其特征在于,若所述比较得出的变化范围增加或减小预定的水平或以上,则所述步骤(b)通过按预定阶段增加或减少调节所述流动台的所述发射功率,若所述比较得出的变化范围是在所述预定水平内则保持通过所述步骤(a)求出的所述发射功率。
6.一种控制与基地台进行无线电通信的流动台的发射功率的方法,其特征在于,它包括下列步骤:
(a)用预定时间设定值去除预定时间设定值内收到的功率强度平均值来求出从所述基地台收到的功率强度平均值;
(b)从所述基地台的发射功率与所述基地台所要求接收功率的和减去所述平均值来求出所述流动台的发射功率;
(c)将通过所述步骤(b)求出的发射功率与所述预定时间之前求出的发射功率相比较,再根据比较得出的变化范围调节所述流动台的所述发射功率。
7.如权利要求6所述的方法,其特征在于,所述基地台的所述发射功率和所述基地台所要求的接收功率是通过分析所述基地台来的信息包确定的。
8.如权利要求6所述的方法,其特征在于,所述步骤(b)是在所述流动台中处于通信初始准备状态的情况下履行的,所述步骤(c)是在所述流动台的初步准备步骤完成后进行通信时在预定的时间内重复履行的。
9.如权利要求8所述的方法,其特征在于,若所述比较得出的变化范围增加或减小预定的水平或以上,所述步骤(c)通过按预定阶段增加或减小来调节所述流动台的所述发射功率,若所述比较得出的变化范围在所述预定水平之内就保持通过所述步骤(b)确定的所述发射功率。
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KR1019960025245A KR980007105A (ko) | 1996-06-28 | 1996-06-28 | 이동국 송신전력 제어방법 |
KR25245/96 | 1996-06-28 |
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JP (1) | JP3165660B2 (zh) |
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1996
- 1996-06-28 KR KR1019960025245A patent/KR980007105A/ko not_active Application Discontinuation
-
1997
- 1997-06-27 RU RU97111034/09A patent/RU2162275C2/ru not_active IP Right Cessation
- 1997-06-27 CN CN97114032A patent/CN1089507C/zh not_active Expired - Fee Related
- 1997-06-30 JP JP17332097A patent/JP3165660B2/ja not_active Expired - Fee Related
- 1997-06-30 US US08/885,736 patent/US6002942A/en not_active Expired - Lifetime
Cited By (4)
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CN100362768C (zh) * | 1999-03-22 | 2008-01-16 | 交互数字技术公司 | 时分双工通信系统中的外环/加权开环功率控制 |
CN1112066C (zh) * | 2000-05-11 | 2003-06-18 | 英业达集团(南京)电子技术有限公司 | 无线协载终端机功率输出的调整方法和装置 |
CN101223537A (zh) * | 2005-07-12 | 2008-07-16 | 英特尔公司 | 能够嵌入接收机信号强度指示的射频识别标签 |
CN101223537B (zh) * | 2005-07-12 | 2014-12-10 | 英特尔公司 | 能够嵌入接收机信号强度指示的射频识别标签 |
Also Published As
Publication number | Publication date |
---|---|
KR980007105A (ko) | 1998-03-30 |
CN1089507C (zh) | 2002-08-21 |
RU2162275C2 (ru) | 2001-01-20 |
JP3165660B2 (ja) | 2001-05-14 |
JPH1066139A (ja) | 1998-03-06 |
US6002942A (en) | 1999-12-14 |
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