CN1918883A - 用于在ip网络中协商承载特性的方法 - Google Patents

用于在ip网络中协商承载特性的方法 Download PDF

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CN1918883A
CN1918883A CN200580004248.4A CN200580004248A CN1918883A CN 1918883 A CN1918883 A CN 1918883A CN 200580004248 A CN200580004248 A CN 200580004248A CN 1918883 A CN1918883 A CN 1918883A
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media gateway
bearer properties
properties
network
bearer
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P·戈德施泰因
R·克罗伊特尔
R·莱里希
E·皮希尔迈尔
B·西格瓦特
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Nokia Solutions and Networks GmbH and Co KG
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Siemens AG
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066Session management
    • H04L65/1101Session protocols
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10Architectures or entities
    • H04L65/102Gateways
    • H04L65/1023Media gateways
    • H04L65/103Media gateways in the network
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10Architectures or entities
    • H04L65/102Gateways
    • H04L65/1033Signalling gateways
    • H04L65/104Signalling gateways in the network
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10Architectures or entities
    • H04L65/102Gateways
    • H04L65/1043Gateway controllers, e.g. media gateway control protocol [MGCP] controllers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M7/00Arrangements for interconnection between switching centres
    • H04M7/006Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP), including next generation networks with a packet-switched transport layer
    • H04M7/0072Speech codec negotiation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M7/00Arrangements for interconnection between switching centres
    • H04M7/12Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal
    • H04M7/1205Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal where the types of switching equipement comprises PSTN/ISDN equipment and switching equipment of networks other than PSTN/ISDN, e.g. Internet Protocol networks
    • H04M7/1245Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal where the types of switching equipement comprises PSTN/ISDN equipment and switching equipment of networks other than PSTN/ISDN, e.g. Internet Protocol networks where a network other than PSTN/ISDN interconnects two PSTN/ISDN networks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M7/00Arrangements for interconnection between switching centres
    • H04M7/12Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal
    • H04M7/1205Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal where the types of switching equipement comprises PSTN/ISDN equipment and switching equipment of networks other than PSTN/ISDN, e.g. Internet Protocol networks
    • H04M7/125Details of gateway equipment
    • H04M7/1255Details of gateway equipment where the switching fabric and the switching logic are decomposed such as in Media Gateway Control

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Business, Economics & Management (AREA)
  • General Business, Economics & Management (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Telephonic Communication Services (AREA)

Abstract

在现有技术中,IP网络中连接路径的传输特性在每次建立连接时在媒体网关中被确定。因此,在连接建立时,被结合在连接中的媒体网关彼此间必须协商共同支持的编解码器和性能(承载特性)并达成确定的看法。为此,每个媒体网关都运用其所支持的承载特性的列表。问题在于由此只有两个媒体网关知道所协商的特性。因此,网络运营商由于网络上级的原因而不能改变某些承载特性。本发明通过以下方式来解决这一问题,即在媒体控制器中运用包含由网络运营商所确定的承载特性的参考列表。

Description

用于在IP网络中协商承载特性的方法
采用基于分组或信元的用于语音信号传输(例如基于IP的语音传输(VoIP)或者基于ATM的语音传输(VoATM))的方法的新的通信架构,规定了连接控制和有效信道控制的分离。于是,迄今通过传统的线路交换电信网所进行的在一个或者多个用户(诸如I SDN用户)之间的通信通过IP网络来进行。传统的模拟或者ISDN终端设备依然可以被用作终端设备。其间布置有因特网IP的ISDN用户的基本关系可以从图1中看出。
原则上,交换技术网络可被划分成用于传输有效信息(载波或者承载)的单元以及用于控制这些有效连接(承载控制)的单元。为了另外能够与诸如PSTN(公共交换电话网)的传统线路交换电信网进行通信,在这两种不同的传输技术之间的“翻译”是必要的,所述“翻译”在耦合点中进行。
在这种耦合点处,借助专用的被称为媒体网关(MG)的设备将有效信息的第一传输技术转换成第二传输技术。媒体网关不仅具有通向PSTN/ISDN网络的接口而且还具有通向IP/ATM网络的接口,并由此构成线路交换的和面向分组的网络之间的接口。它们能够将基于TDM(时分复用)的语音传输实时地转换为基于分组(VoIP)/信元(VoATM)的语音传输,反之亦然。
媒体网关由中央主管机构、即媒体网关控制器(MGC)来控制(图1)。在两个媒体网关控制器之间所传输的信令信息例如借助BICC协议(与承载无关的呼叫控制协议)来传输。媒体网关控制器基本上用于协调媒体网关并且监控/控制媒体网关之间的连接(承载连接)。对媒体网关的控制借助MGCP(媒体网关控制器协议)或者也借助H.248协议来实现。
原则上是在媒体网关中确定传输特性的。如果例如A律地区的用户希望建立至被布置在μ律地区的用户的连接,那么这些特性起作用。如果两个用户的有效信息按照不同的定律被编码,那么必须进行有效信息的转换。例如在从欧洲(A律)向美国(μ律)的超过边界的电话和数据通信业务的情况下,该问题起作用。
在转换过程之前,被结合在信息流中的媒体网关彼此间在每次建立连接时必须协商共同支持的“编解码器与性能”(承载特性)并达成确定的看法。对此,每个媒体网关都运用(führen)其所支持的出厂时已预先设定的承载特性列表。
问题是,由此只有两个媒体网关知道所协商的特性。但是,网络运营商由于网络上级的原因(例如由于经济原因)也许希望能够协商具有与媒体网关所规定的不同的优先级的某些承载特性(例如编解码器)或者将某些承载特性(如编解码器,RFC2833,T38)完全排除在外。这在该现有技术中是不可能的。
本发明所基于的任务是,指出一种途径:如何能够如此设计承载特性的协商,以致为此在任何时候都能够改变规则。
本发明以权利要求1的前序部分中所说明的特征为出发点通过进行表征的特征来解决。
本发明的优点是,在媒体网关控制器中设置并运用附加的参考列表。由此在网络的中央位置处的媒体网关控制器中提供了“网络策略”。媒体网关控制器因此在网络中获得主控功能,也就是说,它的参考列表不依赖于这里所运用的列表的状况对于由媒体网关控制器所控制的媒体网关组而言是单独具有决定性作用的。由此,网络运营商能够以最小的开销、不依赖于其网络的大小(所有媒体网关/IP客户端的数量)来管理承载特性。
由此,“网络策略”的简单改动是通过以下方式实现的,即通过与媒体网关控制器中的参考列表进行比较,将不希望的(也就是未知的或禁止的)承载特性过滤掉。于是,A侧的媒体网关控制器以自身的参考列表为基础、为过滤后所留下的承载特性重新分配优先级。因此,媒体网关控制器中的该附加的参考列表在媒体网关和伙伴媒体网关控制器之间的承载特性协商中加入过滤器。
本发明不仅仅局限于媒体网关/媒体网关控制器。本发明可以以同样的方式应用于IP客户端。同样地,本发明也可以被应用于其他网络或诸如ATM或者MPLS的传输技术,尽管本发明根据IP网络进行描述,但IP网络并不是绝对必要的。
本发明的优选的改进方案在从属权利要求中说明。
下面根据图示的实施例更详细地说明本发明。
图1示出具有PSTN/ISDN终端设备、媒体网关和媒体网关控制器的网络配置,
图2示出依照本发明的方法。
依照本发明,给每个媒体网关控制器分配参考列表。该参考列表包含有关的网络运营商在其网络中所支持的承载特性。这例如可以是编解码器的预先给定的数量,或者编解码器的优先级。承载特性的参考列表和各个承载特性的优先级应该是可管理的。以这种方式,网络运营商可以根据需求对少数媒体网关控制器中的承载特性进行配置。
在该实施例中,根据图2,假定A侧的用户想要开始建立至B侧的用户的连接。在连接建立过程中,将此事通知A侧的媒体网关控制器MGC-A。于是,将A侧的媒体网关控制器的参考列表与A侧的媒体网关MG-A的列表进行比较(步骤1,2)并形成两个列表之间的交集。例如,不包含在自身参考列表中的承载特性或者在自身参考列表中禁止的所有承载特性都可能被删除。结果由媒体网关控制器MGC-A通知给B侧的媒体网关控制器MGC-B(步骤3)。
如果该结果(例如新选出的编解码器)不被B侧的媒体网关控制器MGC-B支持,那么拒绝通过相应的确认消息被通知给A侧。否则,该结果被供应给B侧的媒体网关MG-B(步骤4)。这里所不支持的承载特性从供应中被删除,并且结果被纳入列表中。然后该列表经由B侧的媒体网关控制器MGC-B(步骤5)和A侧的媒体网关控制器MGC-A(步骤6)被提供给A侧的媒体网关MG-A(步骤7)。
协商是连接建立的一部分。现在,有效信息可以在A侧的媒体网关MG-A和B侧的媒体网关MG-B之间按照所协商的承载特性来传输。

Claims (7)

1.用于在具有媒体网关控制器(MGC)和媒体网关(MG)的通信网中协商承载特性的方法,在所述媒体网关(MG)中运用承载特性,
其特征在于,
在媒体控制器(MGC)中运用具有可影响的承载特性的参考列表。
2.按照权利要求1的方法,
其特征在于,
总是通过媒体网关控制器(MGC-A,MGC-B)进行承载特性的协商。
3.按照权利要求1,2的方法,
其特征在于,
承载特性被构造为编解码器。
4.按照权利要求1,2的方法,
其特征在于,
承载特性被构造为编解码器的优先级。
5.按照权利要求1至4的方法,
其特征在于,
带有参考列表的媒体网关控制器(MGC-A,MGC-B)对于由其所控制的媒体网关(MG)组具有主控功能。
6.按照上述权利要求之一的方法,
其特征在于,
通过由网络运营商所实施的配置来实现对承载特性的影响。
7.按照上述权利要求之一的方法,
其特征在于,
通信网被构造为IP网络。
CN200580004248.4A 2004-02-06 2005-02-01 用于在ip网络中协商承载特性的方法 Pending CN1918883A (zh)

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WO2009046594A1 (fr) * 2007-10-09 2009-04-16 Zte Corporation Procédé de négociation de codec entre un réseau sans fil et un réseau central dans un système de télécommunication mobile
WO2010012141A1 (zh) * 2008-07-29 2010-02-04 中兴通讯股份有限公司 一种媒体网关间的双音多频信号的参数协商方法及系统
WO2010078784A1 (zh) * 2009-01-07 2010-07-15 中兴通讯股份有限公司 网络电话网关进行呼叫处理的方法及装置
WO2015096051A1 (zh) * 2013-12-25 2015-07-02 华为技术有限公司 一种负载均衡的方法和装置

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WO2009046594A1 (fr) * 2007-10-09 2009-04-16 Zte Corporation Procédé de négociation de codec entre un réseau sans fil et un réseau central dans un système de télécommunication mobile
RU2452121C2 (ru) * 2007-10-09 2012-05-27 ЗетТиИ Корпорейшн Способ согласования кодека между беспроводной сетью и опорной сетью в системе мобильной связи
WO2010012141A1 (zh) * 2008-07-29 2010-02-04 中兴通讯股份有限公司 一种媒体网关间的双音多频信号的参数协商方法及系统
WO2010078784A1 (zh) * 2009-01-07 2010-07-15 中兴通讯股份有限公司 网络电话网关进行呼叫处理的方法及装置
WO2015096051A1 (zh) * 2013-12-25 2015-07-02 华为技术有限公司 一种负载均衡的方法和装置
CN105264856A (zh) * 2013-12-25 2016-01-20 华为技术有限公司 一种负载均衡的方法和装置

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EP1712060B1 (de) 2007-10-17

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