CN101238652A - 用末端用户无线电终端同步无线电网络 - Google Patents
用末端用户无线电终端同步无线电网络 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2662—Arrangements for Wireless System Synchronisation
- H04B7/2671—Arrangements for Wireless Time-Division Multiple Access [TDMA] System Synchronisation
- H04B7/2678—Time synchronisation
- H04B7/2687—Inter base stations synchronisation
- H04B7/2693—Centralised synchronisation, i.e. using external universal time reference, e.g. by using a global positioning system [GPS] or by distributing time reference over the wireline network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/02—Speed or phase control by the received code signals, the signals containing no special synchronisation information
Abstract
用末端用户无线电终端同步无线电网络,移动站能够接收GPS信号,并且比较接收的GPS时间信号的频率和来自网络的时间信号,以便确定信号之间的差别,并将该差别通信返回到网络。
Description
技术领域
本发明通常涉及全球卫星系统(GSS)接收器,并且特别涉及一种用于使用末端用户无线电终端同步无线电网络的方法。
背景技术
蜂窝电话技术,包括个人通信系统(PCS)设备,已经变得平常。使用这些设备来提供语音、数据、及其它服务(如因特网访问)为蜂窝系统用户提供了许多便利。此外,其它无线通信系统,如双向传呼、中继无线电,由第一应答者(如警察、消防、及医护部门)使用的专用移动无线电(SMR)也已经成为移动通信所必需的。
联邦通信委员会(FCC)已经实施要求:一旦由给定蜂窝电话进行紧急呼叫(如“911”呼叫(也被称作“增强911”或“E911”))时,移动站(MS)(如蜂窝电话)在50英尺以内可定位。这种位置数据有助于警察、医护、及其它执法和公共服务人员,以及其它可能需要或有合法权利确定蜂窝电话的位置的机构。
当前,蜂窝和PCS系统与全球定位系统(GPS)技术相结合,该全球定位系统技术在蜂窝电话设备中使用GPS接收器和其它无线收发器,以满足FCC定位的需要。
这种数据能够对除E911呼叫之外的呼叫有用,并将对无线网络用户(如蜂窝和PCS订户)非常有用。例如,GPS数据可以由MS用户用来定位其它移动站,确定移动站用户与其它地标(landmark)的相对位置,经由因特网地图或其它GPS绘图技术获得蜂窝用户的方向等。
在MS中的GPS接收器具有的一个显著问题是,GPS接收器可能不总是具有无阻碍的天空视野,导致接收的信号非常微弱。通常,接收器不能解调历书(Almanac)或星历表(Ephemeris)数据,使得不可能确定用户的位置或精确的GPS时间。可能通过在通信网络上将星历表和/或历书数据以及GPS时间传送到接收器来处理该问题。通信网络的通常特征是大和可变的传输延迟,使得难以传送精确(不确定性小于1毫秒)的时间。
通过三角测量一组来自一组固定点(如蜂窝发送器)或移动发送器(如GPS卫星)的范围,定位移动单元的概念有共同的要求:传输的时间是已知的。这意味着在所有发送器的时间必须是共同的,或差别已知的。现今在许多系统中,因为系统关注于数据传输而不是测距(ranging),所以该信息不是立即可利用的。因此,在该领域需要克服在同步和非同步网络中传输延迟的问题。
码分多址(CDMA)(TIA/IS-95B)网络在每个基站使用GPS时间参考标准,并且所有的传输帧被绝对地同步到GPS时间上。因此,通过观测对帧、主帧或超(hyper)帧的特定转换,移动站可以预测在几十毫秒内的绝对GPS时间,包括在移动站或无线手持机(handset)内部的无线电传输延迟和群延迟。
其它类别的无线网络,例如时分多址(TDMA)、GSM、模拟移动电话系统(AMPS、TACS)、DTV等,不被同步到GPS时间上。尽管如此,在基站使用的主时钟的精度、准度及稳定性相当地稳定,并相对于GPS时间缓慢变化。因此,与GPS时间相比,时间偏移量和频率漂移非常稳定,并能够被在相对大的时间间隔监视。然而,因为目前无法从中得到绝对GPS时间,所以单独得自这样的系统的任何定时信息具有有限的值。
已经提出的一个解决方案是定位固定的监视实体,称作LMU(本地测量单元),其在指定的地区中的若干基站(BS)是无线电可见的。LMU由无线部分和GPS定时接收器组成。每隔一段时间,它们测量该地区内每个基站相对于GPS时间的时间偏移量和频率漂移。因为一个LMU只能覆盖几个基站,所以覆盖的监视网络能够变得相当大和昂贵。其使得在LMU和中央网络实体之间的通信链路成为必要,该通信链路将每个BS的该信息记入日志,合并来自不同源的信息(如果若干LMU监视相同的基站),并且如果时间辅助必须被传递到BS可见区域中的特定MS,则其传送该信息到地理定位(geolocation)服务器。这要求若干块附加的网络基础结构,以及用于网络操作者使能这种特征的附加软件和维护成本。因而在本领域中需要消除对LMU的需求和相关成本。
于是可见在本领域中存在用于以有效的方式在各无线通信系统(包括蜂窝及GPS订户)中传送GPS数据的需要。还可见在本领域存在对有GPS能力的MS(如无线手持机)的需要。还可见在本领域中存在对能够辅助GPS接收器来加速采集和用于位置确定的需要。还可见在本领域中存在对能够辅助GPS接收器来提供更加精确的位置确定的需要。还可见在本领域中存在对大蜂窝系统的需要,该系统能使用和/或供应用于许多应用的GPS信息给蜂窝用户,包括不要求地理上最近的基站的E911。
发明内容
根据本发明的方法提供通过末端用户无线电终端的使用同步无线电网络。末端用户无线电终端(如具有GPS接收器的移动站(MS))能够确定基站信号定时事件和GPS时间之间的关系,并能确定时钟频率偏移量。然后该数据可以被传送到基站(即网络)用于网络的同步。在对以下各图和详细描述的研究后,本发明的其它系统、方法、特征和优点,对本领域的技术人员将会或将变得明显。意在所有这种另外的系统、方法、特征和优点被包括在该描述中、在本发明的范围内,并由权利要求保护。
附图说明
各图中的组件不必按比例确定,而是重点置于图示本发明的原理。在各图中,相同的参考标号指定遍及不同视图的相应部件。
图1图示了典型的GPS架构;
图2图示了用末端用户无线电终端同步无线电网络的实现;
图3是GSM传输的时间标签的图;
图4是携带GPS TOW的GSM帧的图;
图5是偏移量确定的流程图;
图6是使用图5中确定的偏移量的无线手持机的流程图。
具体实施方式
在图1中显示了典型的GPS架构。系统100包括:GPS卫星102,其是在轨道中的GPS卫星星座的示例;MS(即无线手持机104),其可以包括GPS接收器;基站106;地理定位(服务器)服务中心108;地理定位终端应用110;以及公共安全应答点(PSAP)112。移动站(MS)104,如无线手持机、个人数字助理(PDA)、或相似的移动设备可以具有本发明的定位技术,并可以使用支持各种E911的MS设备实现和地理定位服务的GPS技术。PASP 112和地理定位终端应用110被包括仅用于参照。
GPS卫星102传输扩频信号114,该信号在无线手持机104和地理定位服务器108被接收。为便于说明的目的,其它GPS卫星未显示,然而,其它GPS卫星也在传输由无线手持机104和地理定位服务器108接收的信号。如果无线手持机104接收足够强的扩频信号114,那么在无线手持机104中的GPS接收器(未示出)可以自主地计算无线手持机114的位置,如在GPS系统中典型地所做的。然而,除非它们在开放天空环境中,无线手持机104典型地不能接收足够强的扩频信号114以自主地计算无线手持机104的位置,但是还能够与基站106通信。因而,基站106可以经由信号116与无线手持机104通信信息,以允许无线手持机104计算定位,或可以从无线手持机104传输信息到地理定位服务器108,以使得地理定位服务器108能够计算无线手持机104的位置。如果基站106正传输信息到无线手持机104,以允许无线手持机104计算位置,那么其被称作“无线辅助GPS”或“基于MS的”,而当基站106从无线手持机104传输信息到地理定位服务器108,用于地理定位服务器108计算无线手持机104的位置时,其被称作“网络中心GPS”或“MS辅助的”。
地理定位服务器108还可以经由信号118与地理定位应用110通信,以及经由信号120与PSAP 112通信。这些信号118和120可以是经由无线链路(如蜂窝、WiFi、蓝牙,仅以这些为例)或是可以通过陆上线路(landline)网络(如PSTN、以太网、或其它这样的有线网络,仅以这些为例)。
例如,如果是蜂窝电话,那么无线手持机104可以包括执行呼叫处理(CP)功能的典型的无线手持机部分、用于位置计算的GPS部分、伪距(pseudorange)测量、以及其它GPS功能。连续通信链路、或其它通信链路,执行CP部分和GPS部分之间的通信。硬件集合可以被利用来传输CP和GPS部分之间的信号。在另一个实现中,CP和GPS部分可以共享电路。
如果MS 104具有能力来计算GPS位置,那么其从GPS信号中获得GPS时间,并能计算GPS时间和小区(cell)地点时钟之间的偏移量。无论MS 104的GPS部分是否从地理定位服务中心108接收到辅助数据,这都是真实的。在非同步网络中,每个小区地点时钟将具有与GPS时间不同的偏移量,这使得具有测量的偏移量的小区地点标识符的配对成为必要。在一些无线手持机设计中,基站时钟的频率误差也可以被计算。
然后偏移量和频率误差可以被存储在电话中,和/或(经由信号116)传输到网络,用于存储在数据库中(可能包括在地理定位服务中心108中)。每次无线手持机通过该小区,偏移量和误差可以被更新。如果不可能对基站频率误差进行直接测量,那么多时钟偏移量测量可以用来确定漂移速率。
能够经由数据链路(如SMS或GPRS)访问的非网络相关的存储还可以被使用,使得独立的服务提供者可存储并转发时间辅助信息到独立于该网络的其它无线手持机单元。
这个概念还可以与其它本地化的网络(如Nextel、SMS、FRS等)结合使用,其中一组无线手持机或移动通信设备可以相互帮助以确定定位。例如,其中无线手持机定位(get a fix),该无线手持机能够经由非蜂窝网络(如SMS、CB波段、WiFi、蓝牙或其它任何网络传输偏移量信息,或传输其它信息到使用该网络或作为由相同公司使用的一组设备的一部分的其它无线手持机。
如果MS 104缺乏能力来计算GPS位置,那么它可以捕获来自GPS信号和基站信号的同步事件,并经由信号116将它们发送到能够计算MS 104的GPS位置的服务器。在此计算之后,服务器将能够确定精确的GPS时间,并计算GPS时间和基站中的时钟之间的偏移量(及漂移)。然后,无论那些MS设备是否有能力来计算它们自己的GPS位置,该信息都可以经由信号116被传输到其它MS 104设备,以辅助它们获取GPS信号。
转到图2,显示了使用末端用户无线电终端同步无线电网络的实现。系统100具有一组GPS卫星(由102图示)、基站106、地理定位服务中心108和两个无线手持机104和105。
如前所述,无线手持机104从卫星102接收信号,并且在本地计算GPS位置,或者经由信号116传输足够的信息以允许服务器(如地理定位服务中心108)计算位置。伴随计算GPS位置,在无线手持机104或地理定位服务中心108或一些其它设备(未示出)中的控制器(未示出)确定GPS时间与基站106中的时钟之间的时间偏移量和/或漂移。
无线手持机1 05是包括GPS接收器的无线设备的说明性例子,该GPS接收器要求知道基站106时钟的时钟偏移量和/或漂移以便获取卫星102信号,并产生GPS位置定位。依赖于网络类型及其设计,无线手持机105可以经由信号202直接从无线手持机104,或经由信号204从基站106,或依次经由信号116和204从地理定位服务中心,接收所要求的数据。该信息的其它来源可以包括可以由独立服务提供者实现的非网络设备(未示出)。
在另一个实施例中,无线手持机105和无线手持机104可以是相同的无线手持机,在不同的时间被使用。无线手持机104可以同时计算时钟偏移量和漂移,然后被关闭并忽略(forget)先前计算的数据。当重新供电时,无线手持机104可以需要该数据,并可以从基站106、地理定位服务中心108或一些其它来源搜索它(或是更近期所计算的数值)。
可替代地,无线手持机104可以计算基站106中的时钟的时钟偏移量和/或漂移,然后被关闭,但是存储先前计算的数据。当重新供电时,无线手持机可以从其自己的存储器中而不利用任何外部数据存储召回数据。在某些情况下,这可以消除当MS断电时对在MS中的时间记录的需要,这可以增加充电间的电池时间。
无线手持机还可以建立为若干不同基站计算的偏移量的数据库,并且因为基站时钟是长期稳定的,所以当无线手持机返回到该基站时,该信息是有用的。因而,当在无线手持机或近似的允许设备中的移动GPS接收器在稍后时间返回到已知的小区地点时,移动GPS接收器已经知道小区地点时钟与GPS时间之间的偏移量,使用于该移动GPS接收器的TTFF更短。
在图3中,显示了GSM传输的时间标签。GSM网络已经被选择用于说明。其它网络将具有类似的实现。该时间标签对测量GPS时间和“网络”时间之间的偏移量的处理是必要的。
具有有效的GPS解决方案的无线手持机104的CP部分生成时间标志110,该标志可以实现为硬件脉冲,无线手持机中的GPS接收器用其自己的时钟加标签于该硬件脉冲,该时钟与GPS系统时间具有已知的关系,该GPS系统时间包括“星期时间(TOW)”部分。CP部分还可以发送消息到GPS接收器,该GPS接收器识别与时间标志相关联的GSM帧及位号、和正被使用的基站,如图1中所示。在目前的实现中,用于接收的GSM位的GPS时间标签可以被用于GSM传输的时间标签。通过扣除(subtract)在基站位置和无线手持机位置之间传送的时间滞后,当GSM位离开传输天线时,无线手持机知道GPS时间。该扣除可以在无线手持机或地理定位服务中心(即重新定位服务器)中完成,但是在目前的实施例中使用了服务器。
在另一个实施例中,无线手持机104可以测量GPS时钟与呼叫处理时钟之间的频率差(假定GPS时钟与呼叫处理时钟不是相同的时钟)。在无线手持机104中的GPS接收器可以已经有能力测量其时钟与GPS系统频率标准之间的频率差。类似地,无线手持机还可以已经有能力测量其呼叫处理时钟与从位于基站的无线电网络发送器接收到的频率之间的频率差。因而,所有组件可以被合并到无线手持机中,以测量GPS系统频率标准与无线网络发送器频率之间的频率差,并且可以依赖于无线手持机的设计和实现,被定位在无线手持机的CP部分或GPS接收器部分。
表1包括由CP部分提供的信息,以伴随时间标志:
名称 | 描述 |
基站 | 当前基站的唯一ID |
CP_GSM_Frame | GSM帧号 |
CP_GSM_BIT | GSM位号 |
Time_mark_uncertainty | 时间标志和接收的位边缘之间的可能误差(1 sigma) |
表1
地理定位服务器108可以从无线手持机104接收多个参数112,该无线手持机104包括但不限于GSM位识别符、相关联的GPS TOW和基站ID、位置数据、以及频率误差。一旦时钟偏移量和频率差被确定,那么卡尔曼滤波器或其它估计方法可以被用来模拟(model)无线网络的发送器时钟。在其它实现中,发送器时钟可以被调整以最小化误差。这样知道发送器时钟频率和时间误差,使得GPS接收器的TTFF、能量使用和位置精确度能够具有更好的性能。
在稍后的时间,地理定位服务中心可以传播(propagate)被存储的、加时间标签的GSM帧/位信息到近似的当前时间。然后该被传播的时间可以被传输到当前不具有GPS解决方案的获取无线手持机,如下所述。
转到图4,携带GPS TOW的GSM帧的图。该功能性为还不具有GPS位置的无线手持机104提供了精确的GPS时间。其还图示本发明补偿网络延迟的方法。
当无线手持机104请求来自地理定位服务中心108的辅助时,消息从服务器被发送到无线手持机。该消息识别了具有特定GSM帧/位的GPS时间,在图中被识别为“GSM位Y”。服务器从由该无线手持机或其它无线手持机进行的如上所述的较早测量中创建该消息。当该消息在无线手持机104被接收时,无线手持机104的CP部分生成与当前GSM帧/位对齐的时间标志,在图中被识别为“GSM位X”。CP部分还可以发送消息到GPS接收器,该GSP接收器识别与时间标志相关联的GSM帧和位号、以及正被使用的基站,如表1中所示。然后GPS接收器将使用额定的(或被校正的,如果时钟漂移可用)帧速率,将GPS时间从在消息中所识别的位(Y)传播到对齐时间标志的位(X),因而补偿网络延迟和地理定位服务中心108时间估计误差。因为无线手持机104位置未知,所以存在从基站106到无线手持机104的未知传输延迟。该延迟在接收的GPS时间中表现为不可避免的误差,但是该延迟由典型的蜂窝无线电地点的小尺寸限制。
在表2中,从地理定位服务器108发送到获取无线手持机104中的GPS接收器的一条可能消息的示例如下:
名称 | 描述 | 单位 | 注意 | |
gps_time_tag | VLMU_GPS_Week | GPS星期数 | 星期 | 这些在图4中被显示为 GPSTOW。 |
VLMU_GPS_TOW | 星期的GPS时间 | Usec | ||
freq | VLMU_Freq_Error | 基站频率误差 | Nsec/sec | 在图4中这是“freq”。 |
List_of_meas_uncertainties | VLMU_Time_Accuracy | GPS时间的不确定性 | Usec | |
VLMU_Freq_Err_Acc | 时钟误差的不确定性 | Nsec/sec | ||
network_reference_time | VLMU_GSM_Frame | GSM帧号 | 无 | 在图4中这是位Y。 |
VLMU_GSM_Bit | GSM位号 | 无 |
表2
在表2中的项目可为在数据结构(如在无线网络中识别当前基站附近的基站的邻居表)中识别的每个基站重复一次。在一些实现中,无线手持机104的CP部分可以过滤基站表,并只为服务基站提供数据。
使用在表1和表2中的数据项目,在目前的实现中采用的、用于将加时间标签的GSM帧转换成精确的GPS时间的算法是:
CP_Bits=CP_GSM_Frame*1250+CP GSM_Bit
VLMU_Bits=VLMU_GSM_Frame*1250+VLMU_GSM_Bit
DeltaGSM=CP_Bits-VLMU_Bits
IF deltaGSM<-2710000*1250
deltaGSM+=2715648*1250
ELSEIF deltaGSM>2710000*1250
DeltaGSM-=2715648*1250
ENDIF
DeltaTime=deltaGSM*SecPerGSMBit/(1+VLMU_Freq_error*1e-9)
GPS_TOW=VLMU_GP S_TOW+deltaTime*1e6
GPS_Week=VLMU_GPS_Week
IF(GPS_TOW>=604800*1e6)
{GPS_TOW-=604800*1e6
GPS_Week++
}
ELSEIF(GPS_TOW<0
{GPS_TOW+=604800*1e6
GPS_Week--
}
Time_uncertainty=VLMU_Time_Accuracy+time_mark_uncertainty.
图5中显示了偏移量确定的流程图500。在步骤502,无线手持机104在GPS接收器接收GPS信号114。在步骤504,无线手持机104还从包含定时信息的无线网络接收通信信号116。然后在步骤506,控制器确定在基站106的时钟(在接收的通信信号116中被发送)与GPS时间(在GPS信号114中被发送)之间的时间偏移量和/或漂移。然后该偏移量可以被发送回当前的基站508。
转到图6,图示了使用在图5中确定的偏移量的无线手持机的流程图600。在步骤602,无线手持机104请求来自地理定位服务器108的辅助,在步骤604,从地理定位服务器108发送消息到无线手持机。该消息识别具有特定GSM帧/位的GPS时间,在图4中被识别为“GSM位Y”。地理定位服务器108从由该无线手持机或其它无线手持机进行的较早的测量中创建该消息。当该消息在无线手持机104被接收时,无线手持机104的CP部分生成与(可能地)不同的GSM帧/位对齐的时间标志,在图4中被识别为“GSM位X”,见步骤606。在步骤608,CP部分还可以发送消息到GPS接收器,该GPS接收器识别与时间标志相关联的GSM帧和位号、以及正被使用的基站,如表1中所示。在步骤610,无线手持机104的GPS部分将GPS时间从在消息中识别的位传播到与时间标志相关联的位,因而补偿由地理定位服务中心108引起的网络延迟及时间误差。因为无线手持机104位置未知,所以存在从基站106到无线手持机104的未知的传输延迟。该延迟在接收的GPS时间中表现为不可避免的误差,但是该延迟由典型的蜂窝无线电地点的小尺寸限制。
在图5和图6中的流程图可以以软件或硬件或软件和硬件的结合实现。软件可以呈现在包含机器可读指令的信号承载介质上,如磁带、致密盘、纸穿孔卡、智能卡、或其它光的、磁的、或电的数字存储设备。控制器可以执行在信号承载介质上呈现的软件。控制器的示例可以包括微处理器、数字信号处理器、配置为用作状态机的数字电路、配置为用作状态机的模拟电路、配置来执行编程的指令(如在信号承载介质上所呈现的)的上述任意组合。
为了说明和描述的目的,已经给出了实现的前面描述。该描述不是穷举的,而且不将要求保护的本发明限制于公开的精确形式。各种修改和变化根据上述的描述是可能的,或者可以从实践本发明中获得。例如,描述的实现包括软件,但是本发明可以实现为硬件和软件的结合,或单独以硬件实现。还注意到实现可以在各系统之间变化。权利要求及其等价物限定本发明的范围。
相关申请
本申请要求由Jim Brown等在2005年8月16日提交的美国非临时专利申请序列号11/205,510(题目为:“SYNCHRONIZING A RADIO NETWORKWITH END USER RADIO TERMINALS”)的优先权,该非临时专利申请是由Gregory B.Turetzky等在2002年5月21日提交的美国专利申请10/154,138(题目为“METHOD FOR SYNCHRONIZING A RADIO NETWORK USING ENDUSER RADIO TERMINALS”)的部分连续,要求该专利申请的优先权并通过引用合并于此,并且进一步要求由Gregory B.Turetzky等在2001年5月21日提交的美国临时专利申请号60/292,774(题目为:“METHOD FORSYNCHRONIZING A RADIO NETWORK USING END USER RADIOTERMINALS”)的优先权,通过引用将上述申请的全部合并在本申请中。
Claims (38)
1.一种无线通信设备,其包括:
在无线通信设备中的通信接收器;
在无线通信设备被接收的绝对时间信号;
在通信设备的通信接收器被接收的网络时间信号;以及
存储绝对时间信号与网络时间信号的偏移量的存储器。
2.根据权利要求1所述的无线通信设备,其中绝对时间信号是全球定位系统GPS时钟信号。
3.根据权利要求1所述的无线通信设备,包括:
收到绝对时间信号的GPS接收器,该绝对时间信号是全球定位系统时钟信号;以及
与GPS接收器、通信接收器和存储器进行信号通信的控制器,其中该控制器确定偏移量。
4.根据权利要求3所述的无线通信设备,包括:
与网络时间信号相关联的时钟的频率误差由控制器计算。
5.根据权利要求3所述的无线通信设备,还包括:
基于多个偏移量测量,由控制器进行的漂移速率确定。
6.根据权利要求3所述的无线通信设备,包括:
与无线通信设备相关联的发送器,其传输由另一个无线通信设备收到的偏移量。
7.根据权利要求6所述的无线通信设备,其中偏移量在除了提供服务到通信接收器的通信网络以外的另一个通信网络上传输。
8.根据权利要求3所述的无线通信设备,其中发送器传输由基站收到的偏移量。
9.根据权利要求3所述的无线通信设备,包括:
硬件脉冲,控制器用内部时钟对其进行标记,其中该硬件脉冲与全球定位系统时钟信号具有已知的关系。
10.根据权利要求9所述的无线通信设备,包括:
与正被发送到GPS接收器的硬件脉冲相关联的帧和位号。
11.根据权利要求10所述的无线通信设备,其中帧是GSM帧。
12.一种用于无线通信的方法,其包括:
在无线通信设备中的通信接收器接收经过第一通信网络的网络时间信号;
在无线通信设备接收绝对时间信号;以及
将绝对时间信号与网络时间信号的偏移量存储到存储器中。
13.根据权利要求12所述的用于无线通信的方法,其中绝对时间信号是全球定位系统GPS时钟信号。
14.根据权利要求12所述的用于无线通信的方法,包括:
在GPS接收器接收绝对时间信号,该绝对时间信号是全球定位系统时钟信号;以及
在控制器确定偏移量,该控制器与GPS接收器、通信接收器以及存储器进行信号通信。
15.根据权利要求14所述的用于无线通信的方法,包括:
计算与网络时间信号相关联的时钟的频率误差。
16.根据权利要求14所述的用于无线通信的方法,还包括:
基于多个偏移量测量,由控制器确定漂移速率。
17.根据权利要求14所述的用于无线通信的方法,包括:
在与无线通信设备相关联的发送器传输由另一个无线通信设备收到的偏移量。
18.根据权利要求17所述的用于无线通信的方法,其中偏移量在第二通信网络上传输。
19.根据权利要求14所述的无线通信方法,包括:
用发送器传输由基站收到的偏移量。
20.根据权利要求14所述的无线通信方法,包括:
产生硬件脉冲,控制器用内部时钟对其进行标记,其中该硬件脉冲与全球定位系统时钟信号具有已知的关系。
21.根据权利要求20所述的无线通信的方法,包括:
发送与硬件脉冲相关联的帧及位号到GPS接收器。
22.具有机器可读指令的、用于无线通信的信号承载介质,包括:
机器可读指令,用于在无线通信设备中的通信接收器接收网络时间信号;
机器可读指令,用于在无线通信设备接收绝对时间信号;以及
机器可读指令,用于在存储器中存储绝对时间信号与网络时间信号的偏移量。
23.根据权利要求22所述的用于无线通信的信号承载介质,其中绝对时间信号是全球定位系统GPS时钟信号。
24.根据权利要求22所述的用于无线通信的信号承载介质,其中网络时间信号是蜂窝电话时间信号。
25.根据权利要求22所述的用于无线通信的信号承载介质,包括:
机器可读指令,用于在GPS接收器接收绝对时间信号,该信号是全球定位系统时钟信号;以及
机器可读指令,用于在控制器确定偏移量,该控制器与GPS接收器、通信接收器以及存储器进行信号通信。
26.根据权利要求25所述的用于无线通信的信号承载介质,包括:
机器可读指令,用于计算与网络时间信号相关联的时钟的频率误差。
27.根据权利要求25所述的用于无线通信设备的信号承载介质,还包括:
机器可读指令,用于基于多个偏移量测量,由控制器确定漂移速率。
28.根据权利要求25所述的用于无线通信的信号承载介质,包括:
机器可读指令,用于在与无线通信设备相关联的发送器传输由另一个无线通信设备收到的偏移量。
29.根据权利要求28所述的用于无线通信的信号承载介质,其中偏移量在除了通信网络以外的另一个通信网络上传输。
30.根据权利要求25所述的用于无线通信的信号承载介质,包括:
机器可读指令,用于用发送器传输由基站收到的偏移量。
31.根据权利要求25所述的用于无线通信的信号承载介质,包括:
机器可读指令,用于产生硬件脉冲,控制器用内部时钟对其进行标记,其中硬件脉冲与全球定位系统时钟信号具有已知的关系。
32.根据权利要求3 1所述的用于无线通信的信号承载介质,其包括:
机器可读指令,用于发送与硬件脉冲相关联的帧及位号到GPS接收器。
33.一种无线设备,包括:
在无线设备中收到消息的接收器,该消息识别具有当前帧/位号的绝对时间;
被耦合到接收器的呼叫处理部分,该呼叫处理部分生成与当前帧/位号对齐的时间标志;以及
在无线设备中收到来自呼叫处理部分的信号的GPS接收器,该GPS接收器识别与时间标志相关联的帧/位号,当确定GPS位置时,使GPS接收器能够补偿网络延迟。
34.根据权利要求33所述的无线设备,其中帧和位号是GSM帧/位号。
35.根据权利要求33所述的无线设备,其中对网络延迟还包括对时间估计误差的补偿。
36.一种用于同步无线设备的方法,包括:
在无线设备中的接收器接收消息,该消息识别具有当前帧/位号的绝对时间;
在被耦合到接收器的呼叫处理部分,生成与当前帧/位号对齐的时间标志;
在无线设备中的GPS接收器接收来自呼叫处理部分的信号,该GPS接收器识别与时间标志相关联的帧/位号;并且在GPS接收器中使用帧/位号补偿网络延迟。
37.根据权利要求36所述的方法,其中帧/位号是GSM帧及位号。
38.根据权利要求36所述的方法,其中对网络延迟补偿还包括对时间估计误差的补偿。
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- 2006-08-15 WO PCT/US2006/032158 patent/WO2007022361A1/en active Application Filing
- 2006-08-15 CN CNA2006800185942A patent/CN101238652A/zh active Pending
- 2006-08-15 EP EP06813503A patent/EP1915830A1/en not_active Withdrawn
- 2006-08-15 KR KR1020087003714A patent/KR20080032193A/ko active IP Right Grant
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
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CN102394715A (zh) * | 2011-06-30 | 2012-03-28 | 中兴通讯股份有限公司 | 时钟同步方法和装置 |
CN102394715B (zh) * | 2011-06-30 | 2016-09-07 | 烟台惠通网络技术有限公司 | 时钟同步方法和装置 |
WO2013010405A1 (zh) * | 2011-07-20 | 2013-01-24 | 中兴通讯股份有限公司 | 一种系统同步控制方法和装置 |
WO2015113225A1 (zh) * | 2014-01-28 | 2015-08-06 | 华为技术有限公司 | 同步信号转发方法和用户设备 |
CN105103632A (zh) * | 2014-01-28 | 2015-11-25 | 华为技术有限公司 | 同步信号转发方法和用户设备 |
CN105103632B (zh) * | 2014-01-28 | 2019-02-12 | 华为技术有限公司 | 同步信号转发方法和用户设备 |
Also Published As
Publication number | Publication date |
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EP1915830A1 (en) | 2008-04-30 |
US8437693B2 (en) | 2013-05-07 |
US20110183606A1 (en) | 2011-07-28 |
WO2007022361A1 (en) | 2007-02-22 |
US20060013347A1 (en) | 2006-01-19 |
KR20080032193A (ko) | 2008-04-14 |
US7925210B2 (en) | 2011-04-12 |
JP2009505583A (ja) | 2009-02-05 |
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