CN1227836C - 容量共享的固定和移动卫星无线电电话系统和方法 - Google Patents
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Abstract
在拥挤区域里移动卫星无线电电话系统利用固定卫星无线电电话系统的一部分容量。通过在固定和移动卫星无线电电话系统的重叠区域里提供至少一个固定转发站而实现容量共享。固定转发站在它的附近为固定卫星无线电电话系统和至少一个移动无线电电话转发通信信号。这一固定转发站利用移动无线电电话空中接口跟移动无线电电话通信,这样,这一通信对移动无线电电话来说就是透明的。
Description
发明领域
本发明涉及无线电电话系统和方法,具体而言涉及卫星无线电电话系统和方法。
发明背景
全世界许多地方都在开发和部署卫星无线电电话系统。卫星无线电电话系统常常用于崎岖的地形或者人烟稀少使得普通移动无线电电话或者固定(有线)电话难以实现的地方。卫星无线电电话系统的设计和工作原理在本领域里的技术人员中众所周知,这里不必赘述。显然,无线电电话系统可以用于语音和数据通信,因此,无线电电话可以包括象PCS终端这样的终端。
卫星无线电电话系统可以大致地分成两类:移动卫星无线电电话系统和固定卫星无线电电话系统。在这两种系统里,用一个或更多的卫星跟无线电电话通信。这些卫星可以是轨道卫星或者静地卫星。设计移动卫星无线电电话系统是用来跟尺寸和普通蜂窝无线电电话一样的多个移动无线电电话通信。相反,设计固定卫星无线电电话系统是用来跟利用装在建筑上或者家里的永久或半永久固定天线的多个固定(非移动)无线电电话进行通信的。
固定卫星无线电电话系统的容量一般较大。“容量”这个术语指的是能够跟卫星无线电电话系统同时通信的无线电电话的数量。
卫星无线电电话系统中每一个卫星的容量一般都受到卫星上每一个通信电路为了跟一个无线电电话建立和维持通信所消耗的功率的限制。限制卫星无线电电话系统容量的另一个因素是可以利用的频谱有限和卫星无线电电话系统典型的频率复用性能极差。
跟固定卫星无线电电话系统相比,移动卫星无线电电话系统的容量通常都小得多。特别是目前正在建立的区域和全球移动卫星系统的容量通常都非常有限。使用静地卫星的区域移动卫星系统每一个卫星的容量大约是同时跟10000个无线电电话通信。采用中地球轨道(MEO)或者低地球轨道(LEO)卫星的全球移动卫星系统中每一个卫星的容量甚至更小,典型情况是可以同时跟3000~4000个无线电电话通信。
限制移动卫星无线电电话系统中每一个卫星容量的主要因素是,为了跟很小的手持移动电话建立和维持通信,卫星有效载荷为每一个通信消耗的功率大小。此外,卫星很难形成大量点波束常常限制了移动卫星无线电电话系统的频率复用。由于这些原因和其它原因,移动卫星无线电电话系统的容量常常很小。
固定卫星无线电电话系统通常都没有移动电话业务。相反,它是通过永久或半永久固定终端装置为终端用户家里或办公场所提供服务的。这些装置一般都有在某些情况下能够跟踪卫星的定向天线。
固定卫星无线电电话系统的容量一般都比移动系统的高。固定卫星无线电电话系统一般都是跟固定用户终端通信,这些固定用户终端可以使用相对较大的终端用户天线。这样,固定系统卫星每一通信链路需要的功率可以比移动系统的小。此外,为固定系统分配频率比为移动系统分配频率要自由得多,这至少有两个原因。首先,固定系统一般工作在较高的频率例如C波段或更高的频率上,在这样高的频率上频谱不那么拥挤。第二,用户终端是固定终端,使用的是方向性很强的天线,因此卫星之间的角距很小,有助于频率复用。
由于移动卫星无线电电话系统的容量相对有限,在移动卫星无线电电话系统中的拥挤区域里会出现容量瓶颈或者“过热点”,在这些地方移动卫星无线电电话系统没有足够的容量为所有用户提供服务。在这些拥挤地区很难提高移动卫星系统的容量。
发明简述
因此本发明的目的是提供一种改善了的固定和移动卫星无线电电话系统和方法。
本发明另一个目的是提供一种移动卫星无线电电话系统和方法,它能提高拥挤地区的容量。
为了达到这些目的和其它目的,本发明让移动卫星无线电电话系统在拥挤区域里使用固定卫星无线电电话系统的一些容量。通过在固定和移动系统的重叠区域提供至少一个固定的转发站,就能够获得容量共享。转发站在固定卫星无线电电话系统和附近的至少一个移动无线电电话之间转发通信信号。
本发明源于以下认识,这就是在世界上的许多地方,固定卫星无线电电话系统和移动卫星无线电电话系统有部分或完全重叠的区域存在。因此在这些重叠区域里,可以用固定转发站在固定卫星无线电电话系统和至少一个移动无线电电话之间转发通信信号。固定转发站利用移动无线电电话空中接口跟移动无线电电话通信,这样这一通信对移动无线电电话来说是透明的。但是通过提供至少一个固定转发站,重叠区域的容量瓶颈问题可以部分解决或完全解决。
具体而言,本发明的卫星无线电电话系统有一个跟第一个通信区域里的多个固定无线电电话通信的固定卫星无线电电话系统,还有一个跟第二个通信区域里多个移动无线电电话通信的一个移动卫星无线电电话系统。第一个和第二个通信区域相互重叠,或者说给出了一个重叠区域。在这一重叠区域里至少有一个固定转发站,它在固定卫星无线电电话系统和至少一个移动无线电电话之间转发通信信号。很清楚,即使第一个和第二个通信区域不重叠,在第一个区域里也至少可以提供一个固定转发站,它能在固定卫星无线电电话系统和至少一个移动无线电电话之间转发通信信号。
本发明提供了一种卫星无线电电话系统,包括在第一个通信区域(16)里跟多个第一种无线电电话(14a~14c)通信的第一个卫星无线电电话系统(10),和在第二个通信区域(36)里跟多个第二种无线电电话(34a~34i)通信的第二个卫星无线电电话系统(30);其特征在于:一个在第一区域内的固定转发站50,包括:第一个天线52,第二个天线54,滤波器62,低噪声放大器64,变频器66,低噪声放大器68,滤波器72,功率放大器74和滤波器76,所述转发站用来用无线方式(38)在第一个卫星无线电电话系统(10)和至少一个第二种无线电电话(34e~34i)之间利用第二种无线电电话的空中接口转发通信信号。
本发明还提供了一种卫星无线电电话系统的基站,包括:
一种装置,用来在跟多个固定无线电电话(14a~14c)通信的固定卫星无线电电话系统(10)和跟多个移动无线电电话(34a~34i)通信的移动卫星无线电电话系统(30)的重叠区域(28)里,为基站确定位;和一个在第一区域内的固定转发站50,包括:第一个天线52,第二个天线54,滤波器62,低噪声放大器64,变频器66,低噪声放大器68,滤波器72,功率放大器74和滤波器76,所述转发站用来用无线方式(38)在第一个卫星无线电电话系统(10)和至少一个第二种无线电电话(34e~34i)之间利用第二种无线电电话的空中接口转发通信信号。
固定转发站可以是一个改换语音和控制信道格式的再生式转发器。在这两种实施方案中任意一个里,至少有一个固定转发站能够在移动卫星无线电电话系统的拥挤区域里,利用固定卫星无线电电话系统的至少一部分容量,为移动卫星无线电电话系统提供额外的容量。
固定转发站可以为卫星无线电电话系统提供一种新型基站。该基站包括在固定卫星无线电电话系统和移动卫星无线电电话系统的重叠区域里为基站定位的装置。该基站还包括在固定卫星无线电电话系统和至少一个移动无线电电话之间转发通信信号的装置。因此这种基站能够在拥挤区域为移动卫星无线电电话系统提供额外的容量。
对于本领域里的技术人员来说,很显然本发明可以用于在任何两种卫星无线电电话系统里减轻容量负担。但最好将本发明用于利用固定卫星无线电电话系统的资源增加移动卫星无线电电话系统的容量。这些系统可以共同使用一个卫星。但最好将本发明用于利用包括第二个卫星的固定卫星无线电电话系统的容量资源,为包括第一个卫星的移动卫星无线电电话系统增加容量。本发明还提供了相关的方法。
附图简述
图1是本发明中卫星无线电电话系统和方法的总示意图。
图2A、2B和2C是卫星无线电电话系统中的频率复用示意图。
图3是本发明中固定转发站的框图。
发明详述
下面将更加详细地介绍本发明,同时参考附图,其中说明的是本发明的优选实施方案。但是本发明还可以用许多不同的形式实现,而不应当理解为只限于这里的实施方案;相反,提供这些实施方案是为了使这一说明更加详尽,从而让本领域里的技术人员能够完整地了解本发明的范围。在所有附图中相同的数字表示相同的部件。
参考图1,现在开始介绍本发明的卫星无线电电话系统和有关方法。如图1所示,卫星无线电电话系统包括一个固定卫星无线电电话系统10和一个移动卫星无线电电话系统30。固定卫星无线电电话系统10用第一个卫星12跟第一个通信区域16里的多个固定无线电电话14a、14b和14c通信。
固定卫星无线电电话通信系统10利用第一种空中接口,例如C波段的空中接口,跟多个固定无线电电话14a~14c通信。对固定卫星系统10的控制可以用一个馈电线连接(feeder link)22来实现,这一馈电线连接跟网关24和公共交换(有线)电话网(PSTN)26通信。
对于本领域里的技术人员来说显而易见,固定卫星无线电电话系统10可以包括一个以上的卫星12,而且通常都有大量的固定无线电电话14。此外,固定无线电电话一般使用可以跟多个无线电电话连接的永久性或者半永久性天线。既然天线位置是固定的,由于上述原因,系统的容量就可以很大。
本领域里的技术人员还会明白,馈电线连接22可以包括语音和数据通信信道,以及控制信道。在图中1利用虚线表示控制信道。控制信道可以用在固定无线电电话之间,例如在无线电电话14a和14b之间,用于实现直接通信。控制信道还可以用于在固定卫星无线电电话14c和移动无线电电话或者通过网关24和PSTN 26的有线电话之间进行通信。馈电线连接22可以用同样的空中接口,或者跟第一种空中接口18不同的另一种空中接口。
仍然参考图1,移动卫星无线电电话系统30包括第二个卫星32,这第二个卫星32跟第二个通信区域36里的多个移动无线电电话34a~34d通信。移动卫星无线电电话系统30利用第二种空中接口38,例如L波段或者S波段的空中接口,跟移动无线电电话34通信。或者第二种空中接口38可以跟第一种空中接口18一样。但一般而言,两种空中接口的频率不同。
馈电线连接42可以用于跟其它卫星、蜂窝或者通过网关44和PSTN26跟有线电话系统通信。跟固定卫星系统10一样,馈电线连接42可以包括用实线表示的通信信道和用虚线表示的控制信道。控制信道可以用于建立直接的移动台到移动台的通信,例如移动无线电电话34b和34c之间的通信。控制信道还可以用于在移动电话34a和34d以及其它卫星、移动或者有线电话系统之间建立通信连接。
如同固定卫星无线电电话系统10一样,移动卫星无线电电话系统30可以有一个以上的卫星32,通常都会跟大量的移动无线电电话34通信。固定和移动卫星无线电电话系统也可以共用一个卫星。如何设计固定和移动卫星无线电电话系统对本领域里的技术人员来说都是众所周知的,在这里不必赘述。
还是参考图1,在移动卫星无线电电话系统30里有大量的移动无线电电话34e~34i的地区会出现拥挤区域。同样如图1所示,这一拥挤区域可以是第一个通信区域16和第二个通信区域36的重叠区域28。如果是这种情况,移动卫星无线电电话系统30就可以按照本发明占用固定卫星无线电电话系统10的富余容量。
占用固定系统的容量可以用至少一个固定转发站50a、50b来实现,它在固定卫星无线电电话系统10和至少一个移动无线电电话之间转发通信信号。例如,如图1所示,第一个转发站50a在卫星12和移动无线电电话34e和34f之间转发通信信号。第二个固定转发站50b在卫星12和移动无线电电话34g、34h和34i之间转发通信信号。同样很清楚,固定转发站不必位于重叠区域里,只要它能够在第一个区域里的固定卫星无线电电话系统和移动无线电电话之间转发通信信号。
固定转发站跟卫星12之间用第一种空中接口18通信。但它们跟移动无线电电话之间则用第二种空中接口38通信。因此,从移动无线电电话34e~34i的角度来看,这一通信是透明的。换句话说,对于移动无线电电话34e~34i来说,或者对于它们的用户来说,它们并不知道它们是在跟固定卫星无线电电话系统10通信,而不是跟移动卫星无线电电话系统30通信。但是,在固定转发站50附近的拥挤区域里,移动卫星无线电电话系统30会得到额外的容量。
下面进一步详细介绍本发明的卫星无线电电话系统和方法。根据本发明,移动无线电电话可以通过固定卫星无线电电话系统的设施建立通信链路,即使移动无线电电话是按照在移动卫星无线电电话系统里使用来设计、制造和销售的。在一个重叠地理区域里,可以有一个或更多的运营商利用不同卫星里或者同一个“混合”卫星里两个不同的转发器,同时提供移动和固定电信业务,一个转发器支持移动卫星无线电电话,另一个支持固定卫星无线电电话。由于在移动无线电电话系统的某些点波束范围内会出现容量“过热点”或者拥挤,容量高得多的固定系统可以部署固定转发站来缓解移动系统的容量负担。
参考图2A,其中说明的是移动卫星无线电电话系统30可能会使用的一个示例性七小区频率复用模式。在每一个相对较大的移动系统小区里,这些小区的直径通常都是在400~600km的量级,相邻小区使用的频率可以由转发站用不会导致干扰的较低功率转发,按照图2B和2C中的方式复用,从而大大地提高本地容量。
因此,在固定系统的覆盖区里,固定转发站从固定卫星接收信号,并在当地转发这些信号。一般都要变频,从而将信号变换到移动系统的频带内。在相反方向上,固定转发站从移动无线电电话接收信号,并将移动无线电电话的信号转发给固定卫星系统。同样需要变频,以便将信号变换到固定系统的频带内。
移动无线电电话一般都跟移动卫星系统一起使用。因此,可能需要将固定卫星系统设置成能够支持移动卫星无线电电话系统使用的空中接口。
如果固定和移动卫星无线电电话系统使用的空中接口不同,固定转发站就可以将一种空中接口变换成另一种空中接口,例如通过解调和重新调制。于是固定转发站就成了能够调整通信信道和控制信道信号格式的再生式转发器。但如果移动和固定系统都用基本相同的空中接口,那么固定转发站就可以象非再生式转发器那样工作。
一个优选实施方案可以通过让固定和移动系统都用同样的空中接口而使用最简单的固定转发站。或者可以让固定系统支持移动系统空中接口,尽管固定系统用的可能是另一种固定无线电电话业务的空中接口。
现在参考图3来介绍固定转发站50的一个优选实施方案。如图3所示,固定转发站50用第一个天线52和第一种空中接口18跟卫星12通信,用第二个天线54和第二种空中接口38跟移动无线电电话34通信。天线52收到的信号通过天线54转发出去,其间经过了滤波器62、低噪声放大器64、变频器66、低噪声放大器68、滤波器72、功率放大器74和滤波器76。天线54收到的信号用天线52转发出去,其间经过了滤波器82、低噪声放大器84、滤波器98、变频器86、低噪声放大器88、滤波器92、功率放大器94和滤波器96。这些部件的设计方法对本领域里的技术人与来说都是众所周知的,这里不必赘述。如果需要,可以将一个本地振荡器100和频率发生器102用于上变频和下变频。
因此,固定系统中正向链路频带里的信号经过某一固定转发站放大,按照图2所示的频率规划/复用方案,下变频到合适的移动系统正向链路频带内,再一次放大再在局部地区转发。在相反方向上,来自移动无线电电话的信号经过放大,上变频到为固定转发站保留的合适的固定系统返回链路频带里,经过再一次放大,然后用固定转发站的定向收发天线52发射给固定卫星系统的卫星。
固定转发站50构成一个移动卫星无线电电话系统的基站,包括在固定卫星无线电电话系统和移动卫星无线电电话通信系统的重叠区域里为基站定位的装置,还包括在固定卫星无线电电话系统和至少一个移动无线电电话之间转发通信信号的装置。如果使用了不同的空中接口,转发装置还可以包括在第一种空中接口和第二种空中接口之间变换通信信号的装置。这样就可以在固定和移动卫星无线电电话系统之间实现容量共享。
在前面的附图和说明里,公开了本发明典型的优选实施方案,虽然采用了具体的术语,但这仅仅是为了进行说明,而不是进行限制,本发明的范围由以下权利要求给出。
Claims (16)
1.一种卫星无线电电话系统,包括在第一个通信区域(16)里跟多个第一种无线电电话(14a~14c)通信的第一个卫星无线电电话系统(10),和在第二个通信区域(36)里跟多个第二种无线电电话(34a~34i)通信的第二个卫星无线电电话系统(30);其特征在于:
一个在第一区域内的固定转发站(50),包括:第一个天线(52),第二个天线(54),滤波器(62),低噪声放大器(64),变频器(66),频率发生器(102),低噪声放大器(68),滤波器(72),功率放大器(74)和滤波器(76),其中,滤波器(52)接收来自天线(62)的并将滤波后的信号送到低噪声放大器(64),变频器(66)对来自低噪声放大器(64)的信号和频率发生器的信号进行变频,并将变频后的信号送到滤波器(72),滤波器(72)将经过滤波的信号送到功率放大器(74),功率放大器(74)将放大后的信号送到滤波器(76),经滤波器滤波后的信号送到天线(54),所述转发站用来用无线方式(38)在第一个卫星无线电电话系统(10)和至少一个第二种无线电电话(34e~34i)之间利用第二种无线电电话的空中接口转发通信信号。
2.权利要求1的卫星无线电电话系统,其中的第一个和第二个通信区域相互重叠,形成一个重叠区域(28),其中至少有一个转发站固定在重叠区域里。
3.权利要求1的卫星无线电电话系统:
其中第一个卫星无线电电话系统和第二个卫星无线电电话系统使用第二种无线电电话的空中接口;和
其中至少一个转发站是一个固定中继器,它利用第二种无线电电话空中接口在第一个卫星无线电电话系统和至少一个第二种无线电电话之间中继通信信号。
4.权利要求1的卫星无线电电话系统:
其中第一个卫星无线电电话系统使用第一种无线电电话空中接口,第二个卫星无线电电话系统使用第二种无线电电话空中接口;和
其中至少一个转发站在第一个卫星无线电电话系统和至少一个第二种无线电电话之间,在第一种无线电电话空中接口和第二种无线电电话空中接口之间,转换通信信号。
5.权利要求1的卫星无线电电话系统,其中第一个卫星无线电电话系统的容量比第二个卫星无线电电话系统的大,这样,至少一个转发站利用第一个卫星无线电电话系统较大容量的至少一部分为第二个卫星无线电电话系统提供附加的容量。
6.权利要求5的卫星无线电电话系统,其中至少一个固定转发站位于第二个卫星无线电电话系统里的一个拥挤区域里,在这一拥挤区域里为第二个卫星无线电电话系统提供附加的容量。
7.卫星无线电电话系统的一种基站,包括:
一种装置,用来在跟多个固定无线电电话(14a~14c)通信的固定卫星无线电电话系统(10)和跟多个移动无线电电话(34a~34i)通信的移动卫星无线电电话系统(30)的重叠区域(28)里,为基站确定位;和
一个在第一区域内的固定转发站(50),包括:第一个天线(52),第二个天线(54),滤波器(62),低噪声放大器(64),频率发生器(102),变频器(66),低噪声放大器(68),滤波器(720,功率放大器(74)和滤波器(76),其中,滤波器(52)接收来自天线(62)的并将滤波后的信号送到低噪声放大器(64),变频器(66)对来自低噪声放大器(64)的信号和频率发生器的信号进行变频,并将变频后的信号送到滤波器(72),滤波器(72)将经过滤波的信号送到功率放大器(74),功率放大器(74)将放大后的信号送到滤波器(76),经滤波器滤波后的信号送到天线(54),所述转发站用来用无线方式(38)在第一个卫星无线电电话系统(10)和至少一个第二种无线电电话(34e~34i)之间利用第二种无线电电话的空中接口转发通信信号。
8.权利要求7的基站:
其中的固定卫星无线电电话系统和移动卫星无线电电话系统使用第二种无线电电话空中接口;和
其中的转发装置包括中继装置,用来在固定卫星无线电电话系统和那至少一个移动无线电电话之间用第二种无线电电话空中接口中继通信信号。
9.权利要求7的基站:
其中的固定卫星无线电电话系统使用第一种无线电电话空中接口,移动卫星无线电电话系统使用第二种无线电电话空中接口;和
其中的转发装置包括在固定卫星无线电电话系统和那至少一个移动无线电电话之间,在第一种和第二种无线电电话空中接口之间变换通信信号的装置。
10.权利要求7的基站,其中固定卫星无线电电话系统的容量比移动卫星无线电电话系统的容量大,这样,这一基站利用固定卫星无线电电话系统较大容量中的至少一部分为移动卫星无线电电话系统提供附加的容量。
11.权利要求10的基站,其中的基站位于重叠区域里移动卫星无线电电话系统的拥挤区域中,为拥挤区域里的移动卫星无线电电话系统提供附加的容量。
12.一种容量共享方法,用于在第一个通信区域里跟多个第一种无线电电话(14a~14c)通信的第一个卫星无线电电话系统(10),在第二个通信区域里跟多个第二种无线电电话(34a~34i)通信的第二个卫星无线电电话系统(30),其中第一个和第二个通信区域重叠出一个重叠区域,该容量共享方法包括以下步骤:
采用无线方式在第一个卫星无线电电话系统(10)和至少一个第二种无线电电话(34e~34i)之间利用第二种无线电电话空中接口转发(38)通信信号。
13.权利要求12的方法,其中第一个和第二个通信区域相互重叠形成一个重叠区域(28),其中的转发步骤之前有以下步骤:
在重叠区域里放置至少一个转发站。
14.权利要求12的方法,其中第一个卫星无线电电话系统和第二个卫星无线电电话系统使用第二种无线电电话空中接口,其中的转发步骤包括以下步骤:
利用第二种无线电电话空中接口在第一个卫星无线电电话系统和那至少一个第二种无线电电话之间中继通信信号。
15.权利要求12的方法,其中第一个卫星无线电电话系统使用第一种无线电电话空中接口,第二个卫星无线电电话系统使用第二种无线电电话空中接口,其中的转发步骤包括以下步骤:
在第一个卫星无线电电话系统和那至少一个第二种无线电电话之间,在第一种无线电电话空中接口和第二种无线电电话空中接口之间,转换通信信号。
16.权利要求12的方法,其中第一个卫星无线电电话系统的容量比第二个卫星无线电系统的容量大,这样,其中的转发步骤利用第一个卫星无线电电话系统较大容量的至少一部分,为第二个卫星无线电电话系统提供附加的容量。
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- 1998-08-28 CN CNB988086387A patent/CN1227836C/zh not_active Expired - Fee Related
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- 1998-08-28 KR KR10-2000-7001966A patent/KR100407483B1/ko not_active IP Right Cessation
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AU738830B2 (en) | 2001-09-27 |
AU9210698A (en) | 1999-03-16 |
CN1269078A (zh) | 2000-10-04 |
KR100407483B1 (ko) | 2003-11-28 |
EP1010262A1 (en) | 2000-06-21 |
BR9811376A (pt) | 2000-08-29 |
KR20010023329A (ko) | 2001-03-26 |
WO1999010994A1 (en) | 1999-03-04 |
EP1010262B1 (en) | 2002-11-20 |
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