CN1726662B - 无线通信中改善的路径损失测量 - Google Patents
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Abstract
一种用于在一无线通信系统中决定一收发器上行链路功率需求的方法,其包括自占据着一帧中一第一时隙的一信标信号处取得第一量测;自具有一已知发射信号强度且占据着该帧中一第二时隙的至少一额外通道处取得第二量测;及利用该等量测来决定一路径损失估计。
Description
技术领域
本发明总的有关一种无线通信中的路径损失测量。具体说,本发明是有关在一种使用众多通道来达成路径损失测量以实施开回路功率控制的方法及装置。
背景技术
决定一收发器的上行链路(UL)功率需求时,由于接收信号与发射所需功率之间通常具有一比例关系,因此可能检验接收下行链路(DL)信号,且提取出用于决定适当UL传输功率所需的至少某些信息。倘若该收发器接收到的一信号传输功率属已知、或倘若具有某些可估计传输功率的方式,则将可估计出用于反应该传输的必要传输功率。
然而,对于譬如时间有槽通信系统等某些特定型态的通信系统而言,这些估计并不准确。这是由于信号位准测量的准确度,将因该测量为最后取得者,而受测量持续时间及经历时间所影响。倘若测量持续时间太短,则测量到的信号位准中的变异将对测量造成不利影响。倘若经历时间太长,则量测将因该信号中的暂时变化而较无法代表该信号位准目前的状态。
例如,在一分时双工(TDD)或分时同步分码多重存取(TD-SCDMA)系统上的一无线发射/接收单元(WTRU)的情况下,传输功率可在复数个时隙之间、或甚至在一时隙内大幅变化。这种功率变异将受到各因素、且最显著地是受该WTRU的实体运动所影响。例如,倘若一WTRU是以譬如60公里/小时等适中速度运动,则可能丧失数十微秒的重要信号功率。倘若一无线电帧长10微秒,则意味着甚至可在该帧内发生重要信号变异。因此,由于瞬间测量的信号特征可迅速地丧失其正确性,因此尽可能快速地实施路径损失测量是非常重要。寻求可作为基础功率调整及控制的参考值极为困难。
在许多现存无线通信系统的DL中,其具有可传输至所有WTRU的至少一信标(beacon)信号或导引(pilot)信号。倘若该无线通信系统是一时间有槽系统,则每一帧中皆具有至少一信标信号。在利用信标信号作路径损失测量的一通用移动电话通信系统(UMTS)中即为如此。
例如,在TDD及TDD-SCDMA系统中,WTRU是测量每一帧或次帧的服务信元主要共通控制实体通道(P-CCPCH)或其它信标通道的接收信号码功率(RSCP),并且计算节点B与该WTRU之间的路径损失。这可具有优点,即在发射信标信号之后立即提供一准确的路径损失量测。根据RSCP为基础的路径损失测量是用于决定UL实体通道的发射功率。这种UL实体通道的范例包括实体随机存取通道(PRACH)、专用实体通道(DPCH)、实体上行链路分享通道(PUSCH)及高速分享信息通道(HS-SICH)。
在TDD系统中,一般可运用根据DL路径损失估计为基础的UL传输开回路功率控制。TD-SCDMA系统通常是运用一开回路功率控制,以在过渡成闭回路功率控制模式之前设定UL初始传输功率、或回复至开回路功率控制模式。
因此,亟需提供一种用于实施路径损失估计的方法,其不致具有已知的先前技术通道估计方法的缺点。
发明内容
依据本发明,可在DL信号与UL信号具有一时间间隔的环境下,决定譬如一UL通道等一通道上的功率需求。可测量一信标通道及至少一额外通道,且接着计算出每一通道的路径损失。再将该计算出的路径损失运用至一后续UL时隙。在本发明的一具体实施例中,可在后续的DL时隙中实施更进一步的路径损失计算。可结合该更进一步的路径损失计算与先前的路径损失计算,且将其运用至后续UL时隙。
附图说明
可由仅作为范例用、且借助结合附图而得明白的以下较佳具体实施例说明,来更详细地了解本发明,其中:
图1是具有复数个时隙的一通信帧的示意图。
图2是依据本发明的用于实施路径损失测量及传输功率设定的方法流程图。
图3是依据本发明一变型具体实施例的用于实施路径损失测量及传输功率设定的方法流程图。
具体实施方式
以下将参考附图来说明本发明,其中相同的代码在全文中皆代表相同组件。
此后所描述的本发明大体上可应用于时间有槽系统,且特别可应用至TDD及TD-SCDMA系统中。然而,熟悉本技术的人士应了解到,本发明并非以这些系统为限。
本发明提供一种使用众多个DL通道的改善的通道估计方法,其中可对众多DL通道测量路径损失(PL),使得介于:a)在WTRU处接收及测量DL参考信号、及计算UL功率设定值;与b)运用该计算功率设定值的UL时隙之间的持续时间最小化。可借助测量一接收DL信号的功率、取得该接收信号的传输功率、及计算该传输功率与该接收功率之间的差异,而得决定出该路径损失量测。
可对于每一无线电帧计算一路净损失(PLi)(i是对应于帧的编号)。用于设定UL时隙中WRTU传输功率的路径损失是DL-UL时隙间隔的一函数。倘若DL与UL时隙间隔的持续时间非常小,则路径损失值可对应于最后PLi;或当DL与UL时隙间隔的持续时间较大时,则路径损失值可对应于最后数个PLi的一加权平均(亦即根据目前帧中获致的最新近路径损失,加上针对先前帧所计算得的众多路径损失为基础)。由于可排除一短期估计的影响,因此当DL与UL时隙间隔的持续时间较大时,使用这种加权平均是属较优者。
依据本发明,除了一信标通道的接收信号码功率(RSCP)以外,可使用譬如主要共通控制实体通道(P-CCPCH)或高速实体下行链路分享通道(HS-PDSCH)等至少一其它发射通道(不同于信标通道)的RSCP量测。
在本发明的变型具体实施例中,除了可使用一信标通道及一其它实体通道来计算路径损失以外,可测量三个或更多实体通道、或着尽可能多的实体通道。利用复数个测量用DL通道,将可提高可用功率控制增益,以达成增加信元涵盖及容量。
可借助两种方式来取得依据本发明的接收信号传输功率:1)其可为WTRU已知的一固定数值;或2)其可为发射器提供至接收器的一数值。倘若受测量信号是WTRU已知的一固定数值,则可测量该信号的RSCP,且根据该已知传输功率数值为基础来计算该受测量信号的路径损失。倘若受测量信号不为一已知固定数值,则可由发射器提供相对于一已知信号的一偏置数值、或一实际数值,以指示传输功率。
图1是显示在以多重时隙S0-S14代表的一多重通道无线电帧内的配置。这是一典型TDD帧结构的一范例,其包括众多个DL通道,该等通道包含信标通道、HS-PDSCH、及数据/语音通道。应注意到,图中显示出的时隙编码仅为范例,而确切的时隙编码将依据传输标准而改变。例如,在包括有第三代伙伴计划(3GPP)协议通信等的无线通信中,每一TDD帧皆包含如图中的十五(15)个时隙。当然,对于一TD-SCDMA系统,其帧结构看起来将大不相同。
可在某些协议DL通道上实施路径损失计算。无线电帧10包括两个信标时隙S0及S7;七个实现用特定(即数据或语音)时隙S1、S5、S6、S8、S12、S13、S14;及六个HS-PDSCH时隙S2、S3、S4、S9、S10、S11。
请参考图2,其中显示出依据本发明,用于实施路径损失测量的程序100流程图。节点B是将多重DL通道发射至WTRU(步骤102)。WTRU自该节点B接收多重DL通道(步骤104)。WTRU将测量一信标通道上的RSCP(步骤106)及测量一实体通道上的RSCP(步骤108),且在接收器处已知该等者的传输功率、或发射器已将传输功率通知接收器。应注意到,并非必须如图2所示者来实施步骤106及步骤108;可在步骤106之前实施步骤108,而不致产生不良结果。
WTRU是根据该两量测为基础来计算路径损失(步骤110),或另一选择为根据最新近的量测为基础来计算,以下将对此作详细说明。接着,WTRU可根据组合的计算路径损失为基础来调整UL通道传输功率(步骤112),且以调整后的传输功率来发射该UL通道(步骤114)。
依据本发明,该信标通道可为复数个信标信号中的任何者,其包括、但不限于广播通道(BCH)、主要共通控制实体通道(P-CCPCH)、前向存取通道(FACH)、呼叫通道(PCH)或呼叫指示器通道(PICH)中的任何型态。额外地,该实体通道可包括、但不限于高速实体下行链路分享通道(HS-PDSCH)、次要共通控制实体通道(S-CCPCH)、高速实体下行链路分享通道(HS-PDSCH)、或高速分享控制通道(HS-SCCH)。
关于步骤110中的路径损失计算,其具有众多不同的变型。第一及最简单的变型是计算最新近发生的DL通道的路径损失,以作为决定UL传输功率的一基础。譬如,倘若信标信号处于TS0及TS7中、HS-DSCH处于TS4中、且UL通道(即HS-SICH)处于TS6中,则第一变型将选择最接近UL时隙的时隙,亦即TS4中的HS-PDSCH,来实施路径损失计算。倘若在一后续帧中的UL通道处于TS8中,则由于信标通道是最新近的时隙,因此路径损失计算是根据TS7中的信标通道为基础。
一第二变型因此同一帧中所有DL通道上的量测为一函数来计算路径损失。在较佳解决方案中,该函数是一加权平均。然而,该函数可为一简单平均、或某些其它函数。
一第三变型是与第二变型相似,除了路径损失因此对目前帧的某些或所有DL通道、加上对先前帧的某些DL通道的测量为一函数而计算出以外。熟悉本技术的人士将可明白,可实现一加权函数,使得对较旧估计的加权将对较新估计者少。
最后,计算路径损失的一第四变型是利用以下方程式:
UL Tx Pwr=干涉值+可控制偏置+SIR+PL;第(1)方程式
其中SIR是信号对干扰比,且路径损失(PL)给定为:PL=(信标通道传输功率)-(信号通道的RSCP),或对于HS-PDSCH而言,PL=(信标通道传输功率)-(功率偏置)-(HS-PDSCH的总RSCP),其中功率偏置=(信标通道传输功率)-(HS-PDSCH总传输功率)。
例如,倘若信标通道是以20dBm的一固定功率(Txpwr1)发射,且HS-PDSCH永远较其低10dBm,则HS-PDSCH的发射功率(Txpwr2)为10dBm。倘若在一特定帧中观察到的PL是90dBm,则WTRU将在信标通道的时隙上测量出RSCP1=(20-90)=-70dBm,但在HS-PDSCH的时隙上为RSCP2=(10-90)=-80dBm。倘若WTRU已由发射器通知其两发射通道的传输功率差(即差值(delta))(差值=Txpwr1-Txpwr2)、或着另一选择为Txpwr1及Txpwr2之值,则WTRU可借助一清楚方式来决定路径损失。
在本发明的一变型具体实施例中,除了使用一信标通道及一其它通道以外,亦得在尽可能多的通道上实施可用于计算路径损失的量测。应注意到,尽管全文中皆讨论信标通道,然而本发明亦可利用譬如一个或更多实体通道等一信标通道以外的通道。且,并非必须使用一信标通道。
图3是显示出本发明的一变型具体实施例,程序200是与图2中所示的程序100相似,且其中相同的步骤将具有相同的标号。在本具体实施例中,可运用步骤208及210来测量复数个通道上的RSCP(步骤208)、及根据该复数个量测为基础来计算路径损失(步骤210)。
例如,可由众多HS-PDSCH的RSCP获取额外的路径损失量测,其中该等HS-PDSCH的总发射功率是呈定值。倘若HS-PDSCH的测量结果是与信标通道量测相关联,则可借助本发明的运算来解释该等量测的差值。
本发明的优点是来自两前提:1)由于最新近的路径损失估计的时间点是与实际数值者较接近,使得自最终测量后发生的实际路径损失变化时间较短,因此运用该估计者是属有益者;及2)每一路径损失测量具有较长的测量持续时间,而得使路径损失估计的品质较佳。使每一帧中可用于路径损失估计者超过一单一时隙,将可对本范例中的UL等其它方向链接,允许较接近实际路径损失数值的估计。
一定程度的修饰皆可能属于本发明的范围内。譬如,可借助首先在信标信号与HS-PDSCH之间引入功率偏置的信号,且接着测量HS-PDSCH的总RSCP,以达成本发明的PL测量。例如,对于第(1)方程式中的功率控制设定,譬如SIR等众多参数是用于控制及调整WTRU的行为。可譬如借助RRC(无线电资源控制)信号发送等,将这些参数以信号各别地发送至WTRU,或着可将该等参数置放于系统中所有WTRU的BCH上。可设想到的以上所有修饰、以及其它相似修饰与变型,皆属于本发明的范围内。
Claims (7)
1.一种用于在无线通信中确定收发器上行链路功率需求的方法,其特征在于包括:
自占据着一帧中第一时隙的第一信号处取得第一量测;
自占据着所述帧中第二时隙的具有一已知发射信号强度的第二信号处取得第二量测;及
使用所述第一量测及所述第二量测来确定路径损失估计。
2.如权利要求1所述的方法,其特征在于还包括:
使用所述路径损失估计来确定发射功率。
3.如权利要求1所述的方法,其特征在于还包括:
使用所述路径损失估计来控制所述帧中一后续时隙中的发射功率。
4.如权利要求1所述的方法,其特征在于还包括:
自占据着所述帧中第三时隙的第三信号处取得第三量测;及
利用所述第一量测、所述第二量测、及所述第三量测来取得进一步路径损失估计。
5.一种用于在无线通信中确定收发器上行链路功率需求的装置,其特征在于包括:
第一构件,用于自占据着一帧中第一下行链路时隙的第一信号处获取第一量测;
第二构件,用于自占据着所述帧中第二下行链路时隙的第二信号处获取第二量测;及
第三构件,响应于所述第一量测及所述第二量测,来确定路径损失估计。
6.如权利要求5所述的装置,其特征在于还包括:
第四构件,该第四构件利用所述第三构件在一上行链路时隙中所获取的结果。
7.如权利要求5所述的装置,其特征在于还包括:
第四构件,该第四构件利用所述路径损失估计,来控制所述帧中一上行链路时隙中的发射功率。
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KR20050099645A (ko) | 2005-10-14 |
IL169102A0 (en) | 2007-07-04 |
JP4546254B2 (ja) | 2010-09-15 |
TWI249296B (en) | 2006-02-11 |
CN103327522B (zh) | 2016-06-01 |
KR20100110395A (ko) | 2010-10-12 |
ATE437484T1 (de) | 2009-08-15 |
EP1579602A4 (en) | 2006-01-18 |
TWI343725B (en) | 2011-06-11 |
JP2006510260A (ja) | 2006-03-23 |
DE60328525D1 (de) | 2009-09-03 |
WO2004054135A1 (en) | 2004-06-24 |
TW200414709A (en) | 2004-08-01 |
TW200742313A (en) | 2007-11-01 |
US7372898B2 (en) | 2008-05-13 |
AU2003299605A1 (en) | 2004-06-30 |
NO20053256L (no) | 2005-07-01 |
TW200518501A (en) | 2005-06-01 |
EP1579602B1 (en) | 2009-07-22 |
AR042364A1 (es) | 2005-06-15 |
TWI333343B (en) | 2010-11-11 |
CA2509640A1 (en) | 2004-06-24 |
BR0316762A (pt) | 2005-10-25 |
MXPA05006218A (es) | 2005-08-19 |
KR101025841B1 (ko) | 2011-03-30 |
US20040170132A1 (en) | 2004-09-02 |
EP1579602A1 (en) | 2005-09-28 |
EP2099246A1 (en) | 2009-09-09 |
KR20050091000A (ko) | 2005-09-14 |
CN1726662A (zh) | 2006-01-25 |
CN103327522A (zh) | 2013-09-25 |
KR101025839B1 (ko) | 2011-03-30 |
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