CN100466858C - 一种扩展无线通信网络系统和方法 - Google Patents
一种扩展无线通信网络系统和方法 Download PDFInfo
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- CN100466858C CN100466858C CNB2006100801630A CN200610080163A CN100466858C CN 100466858 C CN100466858 C CN 100466858C CN B2006100801630 A CNB2006100801630 A CN B2006100801630A CN 200610080163 A CN200610080163 A CN 200610080163A CN 100466858 C CN100466858 C CN 100466858C
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Abstract
本发明公开了一种扩展无线通信网络系统和方法,所述系统包括无线通信网、移动终端和数字视频广播设备,所述无线通信网包括DVB适配模块,用于接收分组数据网发送的分组域数据包,对接收到的分组域数据包进行处理,并发送到所述数字视频广播设备,所述数字视频广播设备分别与所述DVB适配模块和移动终端相连,用于将所述DVB适配模块发送的数据包下发到移动终端。通过本发明可以利用有限的带宽为用户提供更高速率的媒体信息广播,提高了无线通信网络的数据广播,特别是多播、广播能力。
Description
技术领域
本发明涉及通信领域,特别是涉及一种扩展无线通信网络系统和方法。
背景技术
随着移动通信技术的发展以及大屏幕多功能终端的日益普及,移动数据业务的使用越来越广泛,人们已不再满足于简单的终端上网浏览业务,而是需要在终端上实现各种高宽带多媒体业务以及高速多媒体广播、多播业务,如视频会议、电视广播、视频点播等,因此,移动通信对大容量高速数据广播业务的需求不断增强,需要通信网络能够利用有限的带宽为用户提供更高速率的多媒体信息广播,以提高无线通信网络的多播、广播能力。
为了解决上述问题,现有的方法有:
方法一,无线通信网络对单个用户,针对语音业务和分组业务,分别提供上行和下行双向信道,同时,为了节约无线资源,各无线通信标准都制定了相应的标准实现多播的功能,利用多播技术,减少数据在核心网上的重复传输,使多个用户在接入网接收相同的无线链路,减少接入网的负担。
目前在无线通信网络中能够实现的多播业务是参考在分组交换网络上承载基于互联网协议(Internet Protocol,IP)的多播协议,按照固网中实现多播的方式在无线通信网络中实现IP多播。
图1为多播业务的无线通信网络图,与一般的无线通信网络的不同之处在于增加了IP多播业务源。IP多播业务源和网关GPRS支持节点(GPRSsupport node,GGSN)通过Gi接口连接;GGSN支持IGMP路由协议,相当于支持多播功能的路由器。
多播业务的实现过程如下:
首先,终端向无线通信网络发起多播注册过程,在无线网络内建立从GGSN到终端的多播数据传输通道;
然后,无线通信网的网络节点(包括GGSN,SGSN,RNC)接收多播业务源发送来的多播数据包;
无线通信网的网络节点通过其内部的发送通道选择模块确定将接收到的多播数据包发往哪个特定目的端口。
所述发送通道选择模块是无线通信网中现有的功能模块,它解析接收到的数据包的目的地址,并根据不同目的地址将数据发送到不同的发送端口。
由于无线通信网的空中接口资源有限,多播业务所能支持的带宽和速率也十分有限,因此,该方案无法很好的支持大量、高速多媒体广播、多播业务。
方法二,通过地面数字广播网络向移动终端提供多媒体业务所制订的DVB手持传输标准(Digital Video Broadcasting-Handset,DVB-H)。DVB-H系统依托DVB陆地传输标准(Digital Video Broadcasting-Terrestrial,DVB-T),通过增加一定的附加功能和改进技术使移动终端能够稳定地接收广播电视信号。数字电视地面广播标准DVB-T于1997年发布。在高码率传输移动环境中表现很好,但是由于功耗比较大,不适合靠电池供电的移动终端通过地面数字电视广播网络接收数字电视节目。为此,需要在DVB-T的基础上引入新的技术,形成新的适合于移动终端接收地面广播数字电视节目的传输标准。和DVB-T相比,DVB-H终端具有更低的功耗,移动接收和抗干扰性能更为优越,因此该标准适用于移动电话、手持计算机等小型便携设备通过地面数字电视广播网络接收数字电视信号,而不占用网络的频带资源。
DVB-H 系统前端由DVB-H封装器和DVB-H调制器构成,DVB-H封装器用于将IP数据包封装成MPEG-2系统传输流,DVB-H调制器用于信道编码和调制;系统终端由DVB-H解调器和DVB-H终端构成,DVB-H解调器负责信道解调、解码,DVB-H终端负责相关业务的处理、显示。
数据链路层采用时间分片技术,用于降低移动终端的平均功耗,便于进行平稳、无缝的业务交换。还采用多协议封装前向纠错技术,可以提高移动使用中的信噪比门限和多普勒性能,同时也能增强抗脉冲干扰的能力。
物理层在DVB-T的基础上进行补充,增加了4K传输模式和深度符号交织等内容,除包含原有DVB-T的技术特点外,在传输参数信令比特中增加了DVB-H信令,用于提高业务速度。
由于DVB技术仅有上行信道,不支持上行信息交互,所以,无法支持动态的多媒体信息广播。
发明内容
为了解决上述问题,本发明的一个目的就是提供一种扩展无线通信网络系统,包括无线通信网、移动终端,还包括数字视频广播设备,所述无线通信网包括DVB适配模块,用于接收分组数据网发送的分组域数据包,对接收到的分组域数据包进行处理,并发送到数字视频广播设备,所述数字视频广播设备分别与所述DVB适配模块和移动终端相连,用于将所述DVB适配模块发送的分组域数据包下发到移动终端。
所述无线通信网包括无线通信接入网和无线通信核心网。
所述数字视频广播设备与无线通信接入网或无线通信核心网相连。
所述DVB适配模块包括接收模块、数据处理模块和发送模块,其中,
接收模块用于接收分组数据网发送的分组域数据包,并发送到数据处理模块;
数据处理模块对接收模块传送的分组域数据包进行解析,更改目的地址,并发送到发送模块;
发送模块用于接收数据处理模块传送的分组域数据包,并将该数据包发送到数字视频广播设备。
所述DVB适配模块在无线通信网的无线通信核心网或无线通信接入网中。
所述DVB适配模块在无线通信网的无线通信核心网的SGSN或GGSN或无线通信接入网的RNC中。
所述数字视频广播设备包括DVB发射台和DVB复用器,其中,
DVB 复用器分别与DVB适配模块和DVB发射台相连,将DVB适配模块发送来的数据进行处理,使之符合DVB发射台发送的传输流标准,并将该传输流发送到DVB发射台;
DVB 发射台通过无线方式将从DVB复用器接收到的数据包发送至移动终端。
所述DVB复用器在无线通信网内部或在无线通信网外部。
本发明的另一目的在于,提供一种扩展无线通信网络方法,包括以下步骤:
步骤A)移动终端通过无线通信接入网向无线通信网发送注册请求命令,建立通信链路;
步骤B)分组数据网将分组域数据包发送到无线通信网;
步骤C)无线通信网的中的DVB适配模块对接收到的分组域数据包进行处理,并发送到数字视频广播设备,数字视频广播设备将接收到的分组域数据包通过数字视频广播设备发送到移动终端。
所述步骤C)还包括以下步骤:
步骤C1)无线通信网的网络节点将接收到的分组域数据包发送到DVB适配模块;
步骤C2)DVB适配模块对接收到的分组域数据包进行解析,更改目的地址,发送到DVB复用器;
步骤C3)DVB复用器将DVB适配模块发送来的数据进行处理,使之符合DVB发射台发送的传输流标准,并将该传输流发送到DVB发射台;
步骤C4)DVB发射台将从DVB复用器接收到的数据包发送至移动终端。
所述步骤C)还包括以下步骤:
步骤C1′)无线通信网的网络节点判断接收到的分组域数据包是否为多播或广播数据包;
步骤C2′)如果接收到的分组域数据包是多播或广播数据包,无线通信网的网络节点将接收到的多播或广播数据包发送到DVB适配模块。
步骤C3)所述DVB发射台发送的传输流标准为MPEG-2。
所述步骤C4)还包括以下步骤:
步骤C41)DVB发射台将从DVB复用器接收到的数据包根据DVB规范进行处理。
本发明的扩展无线通信网络系统和方法利用有限的带宽为用户提供更高速率的媒体信息广播,提高了无线通信网络的数据广播,特别是多播、广播能力。
附图说明
图1为多播业务的无线通信网络图;
图2为本发明扩展无线通信网络系统实施例的无线通信网络图;
图3为本发明扩展无线通信网络系统的DVB适配模块的模块图;
图4为本发明扩展无线通信网络方法实施例的流程图。
具体实施方式
本发明的基本思想是:在无线通信网络中引进数字视频广播设备,通过DVB技术,利用有限的带宽为用户提供更高速率的媒体信息广播,以提高无线通信网络的数据广播能力。
下面结合附图2~4及具体实施例对本发明再作进一步详细的说明。
图2为本发明扩展无线通信网络系统实施例的无线通信网络图,其中,该扩展无线通信网络系统包括无线通信网、移动终端和数字视频广播设备。
与现有的无线通信系统不同之处在于,本发明的扩展无线通信网络系统在无线通信网和移动终端之间增加了数字视频广播设备,所述数字视频广播设备分别与无线通信网和移动终端相连,用于将无线通信网发送的分组域数据包下发到移动终端;
本发明的扩展无线通信网络系统在无线通信网的网络节点中增加了DVB适配模块,用于接收分组数据网发送的分组域数据包,对接收到的分组域数据包进行处理,并发送到数字视频广播设备。
所述无线通信网包括无线通信接入网和无线通信核心网。
所述数字视频广播设备与无线通信接入网或无线通信核心网相连。
所述DVB适配模块在无线通信网的无线通信核心网的SGSN或GGSN或无线通信接入网的RNC中,以及CDMA网络,码分多址2000(CDMA2000)通信系统,等其他网络中与SGSN,GGSN或RNC中相对应的网络节点中。
所述数字视频广播设备包括DVB发射台和DVB复用器。其中,
DVB 复用器分别与DVB适配模块和DVB发射台相连,用于接收无线通信网通过DVB适配模块发送的分组域数据包,对接收到的数据包进行封装、复用,合并成为可以通过DVB发射台发送的传输流,并把合并后的传输流发送到DVB发射台;
DVB 发射台通过无线方式将从DVB复用器接收到的数据包发送至移动终端。
所述DVB复用器可以在无线通信网内部,也可以在无线通信网外部。
所述DVB适配模块包括接收模块、数据处理模块和发送模块。其中,
接收模块用于接收分组数据网发送的分组域数据包,并发送到数据处理模块;
数据处理模块对接收模块传送的分组域数据包进行解析,更改目的地址,并发送到发送模块;
发送模块接收到数据处理模块传送的分组域数据包后,将该数据包发送到DVB复用器。
所述移动终端为DVB移动终端,包括蜂窝式收发机,DVB接收机,CPU控制器。
所述无线通信网可以是2G中,GSM、CDMA网络的,也可以是3G中,码分多址2000(CDMA2000)通信系统,时分双工—同步码分多址(TD-SCDMA)通信系统或者宽带码分多址(WCDMA)通信系统的。
图4为本发明扩展无线通信网络方法实施例的流程图,如图4所示,具体步骤如下:
1)移动终端通过无线通信接入网向无线通信网发送注册请求命令,无线通信网响应该注册请求命令,并向移动终端发送注册请求应答命令,建立通信链路。
所述通信链路包括信令链路和数据链路。
2)分组数据网将分组域的数据包发送到无线通信网。
分组数据网将分组域的数据包通过GPRS网关支持节点(Gateway GPRSSupport Node,GGSN)发送到无线通信网,或者是先将分组域的数据包发送到BMSC(广播多播服务中心),由BMSC(广播多播服务中心)对该数据包进行加密处理,然后再通过GGSN发送到无线通信网。
GGSN 是具有扩展性的高性能网关,是接入分组数据网的接口,具有路由、分组数据包转换、IP地址分配、防火墙、计费等功能。
所述分组数据网可以是Internet。
3)无线通信网的网络节点将接收到的分组域数据包通过数字视频广播设备发送到移动终端。
31)无线通信网的GPRS业务支持节点(Serving GPRS Support NodeGPRS,SGSN)接收到由GGSN发送来的数据包后,通过DVB适配模块将该数据包发送到DVB复用器。
SGSN 是无线通信核心网的核心节点,主要作用是记录移动台的当前位置信息,并且在移动台和GGSN之间完成移动分组数据包的发送和接收。
311)SGSN中DVB适配模块的接收模块接收到由GGSN发送来的分组域数据包后,并将该分组域数据包发送到DVB适配模块的接收模块;
312)DVB 适配模块的接收模块将该数据包发送给DVB适配模块的数据处理模块;
SGSN 接收到的数据包是GGSN通过GTP协议封装后发送的GTP数据包,GTP协议数据包内封装了需要传送的IP包。
DVB 适配模块的数据处理模块收到该GTP数据包后,首先将GTP数据包拆分,去掉GTP字头,获得IP数据包,用DVB复用器的IP地址代替该IP数据包的目的IP地址,并将处理后的数据包发送到DVB适配模块的发送模块;发送模块将该数据包发送到DVB复用器。
较佳地,所述步骤31)进一步包括:
3111)SGSN接收到由GGSN发送来的数据包后,根据数据包的目的IP地址判断该数据包是否为多播或广播数据包;
SGSN 接收到的数据包是GGSN将数据通过GTP协议发送来的,SGSN收到一个GTP-U数据包后,可以查看GTP头中的扩展头类型,如果扩展头类型为1,说明该数据包是多播数据包;如果扩展头类型为0,说明该数据包不是多播数据包。具体实现参照协议3GPP 29.060 General Packet Radio Service(GPRS)和GPRS Tunnelling Protocol(GTP)across the Gn and Gp interface。
对广播数据包的判断方法与多播数据包的判断方法相同,也是查看GTP头中的扩展头类型。
也可以根据SGSN接收到的数据包的中的目的IP地址来判断该数据包是否为多播或广播数据包。SGSN接收到由GGSN发送来的GTP数据包后,将该数据包拆封,获得IP数据包,从IP数据包头中获得目的IP地址;如果目的IP地址为224.0.0.0到239.255.255.255,则该IP地址即为多播地址。具体实现协议参考《TCP/IP详解,卷1:协议》第12章。
3112)如果该数据包不是多播或广播数据包,SGSN将该数据包发送到RNC,通过无线通信接入网发送到移动终端,通信过程结束;否则,执行步骤3113);
3113)SGSN将该数据包发送到DVB适配模块的接收模块;
32)DVB 复用器对从DVB适配模块接收到的数据包,根据DVB数据广播协议进行封装、复用,转换成MPEG-2数据流,然后,将该数据流传输到DVB发射台。
所述数据流(Data streaming)是指数据由MPEG系统定义的分组原始流(Packetized Elementary Stream,PES)的负载携带,用来实现DVB广播网络上传送面向流的端到端数据。数据流分成三种:异步数据流,从同步数据流和同步数据流,这三种数据流都是被插入到MPEG—2传送流的分组原始流层进行传送。
DVB 系列数据广播协议标准包括TR 101 202《DVB数据广播规范执行指南》和EN 301192《DVB数据广播的规范》。根据该标准,所有数据被分割成188字节大小的定长分组数据包,这些包在数字电视广播中用米传送数字视音频以及相关的信息。
DVB 系列数据广播协议标准中,数字存储媒体的命令和控制(DSM—CC)是数据广播的另一基础。所谓DSM—CC是一种特殊的协议,用于提供在数字存储媒体上管理MPEG码流所需的基本控制函数和操作。此协议位于操作系统层之上、应用层之下,独立于所管理的数字存储媒体、所关联的网络协议以及所在的操作系统,也和数字存储媒体是本地的还是远程的无关。DSM—CC是一个庞大的规范,数据广播标准只是其应用的一个领域。
DVB 数据广播协议中的封装方式采用多协议封装(Multiprotocolencapsulation,MPE),该封装方式将数据包封装成DSM—CC分段,这种分段兼容MPEG—2分段,最终实现DVB广播网络上传送多种协议的数据包如IP数据包等。
DVB 数据广播协议采用多协议封装方式,为IP提供完全透明通道。上层可以是TCP和UDP。
33)DVB 发射台根据DVB规范对收到的数据流进行处理,并将处理后的数据流发射到移动终端。
DVB 发射台根据DVB规范对收到的数据流进行DVB调制编码方式,使之符合DVB-H或DVB-T技术。
DVB 调制方式有正交频分复用(Orthogonal Frequency DivisionMultiplexing,OFDM)、编码正交频分复用(Coded Orthogonal FrequencyDivision Multiplexing,COFDM)、正交相移键控(Quadrature phase Shiftkeying,QPSK)、正交调幅(Quadrature Amplitude Modulation,QAM)等,编码方式有MPEG-2,调制编码方式有:可变编码及调制方式(Variable codemodulate,VCM);自适应编码及调制方式(Adaptive code modulate,ACM)等。
34)移动终端接收DVB发射台发送来的数据流。
所述移动终端为DVB移动终端,包括蜂窝式收发机,DVB接收机,CPU控制器。
蜂窝式收发机可以是采用GSM,TDMA,CDMA,AMPS,或其它标准通信协议的蜂窝式收发机。DVB接收机可以是采用DVB-T或DVB-H标准的DVB接收机,CPU控制器通过配置,动态地选择蜂窝式收发机与DVB接收机之间的通信模式。CPU控制器能根据当前通信环境或用户的操作选择适当的通信链路。例如,如果要传输话音数据,则蜂窝式链路是理想的.从而CPU会选择蜂窝式收发机传输数据;如果用户选择收看DVB电视节目,则CPU选择DVB接收机接收数据。
DVB适配模块可以在无线通信核心网的网络节点SGSN、GGSN中,也可以在无线通信接入网的RNC中,以上过程是以DVB适配模块在SGSN中为例进行说明。DVB适配模块在无线通信核心网的GGSN中时的传输过程与上述过程基本相同,在此不再详述。DVB适配模块在无线通信接入网的RNC中时,分组数据网发送的分组域数据包首先经过无线通信核心网发送到无线通信接入网,由无线通信接入网的RNC中的DVB适配模块发送到DVB复用器,再经过DVB发射台下发到移动终端。
DVB适配模块在CDMA网络,码分多址2000(CDMA2000)通信系统,等其他网络中与SGSN,GGSN或RNC中相对应的网络节点中时的传输过程与上述过程基本相同,在此不再详述。
本发明的扩展无线通信网络系统,在无线通信网络中引进DVB设备,通过DVB技术,利用有限的带宽为用户提供更高速率的媒体信息广播,提高了无线通信网络的数据广播,特别是多播、广播能力,满足了在终端上实现各种高宽带多媒体业务以及高速多媒体广播、多播业务,如视频会议、电视广播、视频点播的需求。
最后说明的是,以上实施例仅用以说明本发明的技术方案而非限制,尽管参照较佳实施例对本发明进行了详细说明,本领域的普通技术人员应当理解,可以对本发明的技术方案进行修改或者等同替换,而不脱离本发明技术方案的精神和范围,其均应涵盖在本发明的权利要求范围当中。
Claims (13)
1.一种扩展无线通信网络系统,包括无线通信网、移动终端,其特征在于,还包括数字视频广播设备,所述无线通信网包括数字视频广播适配模块,所述数字视频广播适配模块用于接收分组数据网发送的分组域数据包,对接收到的分组域数据包进行处理,并发送到所述数字视频广播设备,所述数字视频广播设备分别与所述数字视频广播适配模块和移动终端相连,用于将所述数字视频广播适配模块发送的分组域数据包下发到移动终端。
2.如权利要求1所述的扩展无线通信网络系统,其特征在于,所述无线通信网包括无线通信接入网和无线通信核心网。
3.如权利要求2所述的扩展无线通信网络系统,其特征在于,所述数字视频广播设备与无线通信接入网或无线通信核心网相连。
4.如权利要求1所述的扩展无线通信网络系统,其特征在于,所述数字视频广播适配模块包括接收模块、数据处理模块和发送模块,其中,
接收模块用于接收分组数据网发送的分组域数据包,并发送到数据处理模块;
数据处理模块对接收模块传送的分组域数据包进行解析,更改目的地址,并发送到发送模块;
发送模块用于接收数据处理模块传送的分组域数据包,并将该分组域数据包发送到数字视频广播设备。
5.如权利要求4所述的扩展无线通信网络系统,其特征在于,所述数字视频广播适配模块在无线通信网的无线通信核心网或无线通信接入网中。
6.如权利要求4所述的扩展无线通信网络系统,其特征在于,所述数字视频广播适配模块在无线通信网的无线通信核心网的SGSN或GGSN中,或在无线通信接入网的RNC中。
7.如权利要求1所述的扩展无线通信网络系统,其特征在于,所述数字视频广播设备包括数字视频广播发射台和数字视频广播复用器,其中,
数字视频广播复用器分别与数字视频广播适配模块和数字视频广播发射台相连,将数字视频广播适配模块发送来的分组域数据包进行处理,使之符合数字视频广播发射台发送的传输流标准,并将该符合传输流标准的分组域数据包发送到数字视频广播发射台;
数字视频广播发射台通过无线方式将从数字视频广播复用器接收到的符合传输流标准的分组域数据包发送至移动终端。
8.如权利要求7所述的扩展无线通信网络系统,其特征在于,所述数字视频广播复用器在无线通信网内部或在无线通信网外部。
9.一种扩展无线通信网络方法,包括以下步骤:
步骤A)移动终端通过无线通信接入网向无线通信网发送注册请求命令,建立通信链路;
步骤B)分组数据网将分组域数据包发送到无线通信网;
步骤C)无线通信网中的数字视频广播适配模块对接收到的分组域数据包进行处理,并发送到数字视频广播设备,数字视频广播设备将接收到的分组域数据包发送到移动终端。
10.如权利要求9所述的扩展无线通信网络方法,其特征在于,所述步骤B和C之间还包括:
步骤C1)无线通信网的网络节点将接收到的分组域数据包发送到数字视频广播适配模块;
所述步骤C)具体包括以下步骤:
步骤C2)数字视频广播适配模块对接收到的分组域数据包进行解析,更改目的地址,发送到数字视频广播复用器;
步骤C3)数字视频广播复用器将数字视频广播适配模块发送来的分组域数据包进行处理,使之符合数字视频广播发射台发送的传输流标准,并将该符合传输流标准的分组域数据包发送到数字视频广播发射台;
步骤C4)数字视频广播发射台将从数字视频广播复用器接收到的符合传输流标准的分组域数据包发送至移动终端。
11.如权利要求9所述的扩展无线通信网络方法,其特征在于,所述步骤B和C之间还包括以下步骤:
步骤C1′)无线通信网的网络节点判断接收到的分组域数据包是否为多播或广播数据包;
步骤C2′)如果接收到的分组域数据包是多播或广播数据包,无线通信网的网络节点将接收到的多播或广播数据包发送到数字视频广播适配模块。
12.如权利要求10所述的扩展无线通信网络方法,其特征在于,步骤C3)所述数字视频广播发射台发送的传输流标准为MPEG-2。
13.如权利要求10所述的扩展无线通信网络方法,其特征在于,所述步骤C4)还包括以下步骤:
步骤C41)数字视频广播发射台将从数字视频广播复用器接收到的符合传输流标准的分组域数据包根据数字视频广播规范进行处理。
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