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Seamless SIP-Based VoIP in Disparate Wireless Systems and Networks

机译:异构无线系统和网络中基于SIP的无缝VoIP

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In the emerging data networks, session initiation protocol (SlP)-based voice over IP (VoIP) is gaining wide-scale acceptance as a means of transporting voice over the packet data networks. With the emergence of interoperability between various third-generation (3G) cellular technologies such as 1xEV, 1xEV-DO, 1xEV-DV, and the Universal Mobile Telecommunications System (UMTS) on one hand and wireless LAN (WLAN) technologies such as 802.11a/b/g, HiperLAN/2, and Bluetooth~* on the other, multimedia applications would have to intemperate seamlessly among several air interfaces. Mobile IP, a layer 3 protocol, maintains the data session across heterogeneous air interfaces but does not guarantee minimal or no packet loss when handing over a mobile node from one air interface to another. This paper first discusses a network architecture that supports seamless interoperability between 3G and WLAN and proposes autonomous layer 2 enhancements at the client side to support SIP-based multimedia applications in general and voice applications in particular. Finally, it discusses some other network issues that pose a challenge to providing VoIP in commercial networks in general, such as using SIP with network address translation (NAT) over mobile IP, and it specifically addresses the problem of performing VoIP in CDMA2000~* 1XRTT.
机译:在新兴的数据网络中,基于会话发起协议(SIP)的IP语音(VoIP)作为在分组数据网络上传输语音的一种手段,已获得了广泛的接受。随着一方面的各种第三代(3G)蜂窝技术(例如1xEV,1xEV-DO,1xEV-DV和通用移动电信系统(UMTS))与无线LAN(WLAN)技术(例如802.11a)之间的互操作性的出现/ b / g,HiperLAN / 2和Bluetooth〜*,则多媒体应用程序必须在多个空中接口之间无缝激活。作为第3层协议的移动IP可以在异构空中接口之间维持数据会话,但是当将移动节点从一个空中接口切换到另一个空中接口时,不能保证最小或没有丢包。本文首先讨论了一种网络架构,该架构支持3G与WLAN之间的无缝互操作性,并在客户端提出了自主的第2层增强功能,以支持一般情况下基于SIP的多媒体应用程序,尤其是语音应用程序。最后,它讨论了其他一些一般在商用网络中提供VoIP带来挑战的网络问题,例如在移动IP上使用具有IP地址的SIP的SIP,并专门解决了在CDMA2000〜* 1XRTT中执行VoIP的问题。 。

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