无线异构网络中MultiHomed移动节点采用SIP移动性优化的互通方案
Interworking Scheme Using Optimized SIP Mobility for MultiHomed Mobile Nodes in Wireless Heterogeneous Networks
摘要：
如今，移动用户希望使用他们的多接口移动设备通过基于异构无线技术的网络附着点（PoA）来访问互联网。他们还希望在正在进行的会议期间无缝地改变活动方案，以提高服务质量和/或降低货币成本。如果处理得当，多宿主移动节点提供了一个潜在的解决方案，这个问题。因此，异构环境下多宿主移动节点的管理是一个重要的研究课题。在本文中，我们提出了对SIP移动性（预呼叫加呼叫中移动性）的改进，以支持异构无线网络中多宿主移动节点的无缝移动性。预呼叫移动性被扩展为关联用户标识符（即，SIP URI）和接口标识符（即，IP地址）。移动终端的多个地址由用户加权以在SIP服务器中创建优先级列表，从而保证移动节点的弹性可达性并避免通过无线链路的不必要信令，从而节省无线电资源。然后，三种变化的通话中移动性，称为硬，混合和软程序，也提出了。其主要目的是尽量减少，甚至避免，在移动节点的接口切换过程中的数据包丢失。所提出的解决方案已实现在一个无线异构测试床组成的802.11 WLAN加3.5蜂窝网络，这是完全可控和可配置的。该测试平台已被用来研究的性能和鲁棒性的三个拟议中的呼叫移动程序。
英文摘要：
Nowadays, mobile users wish to use their multi-interface mobile devices to access the Internet through network points of attachment (PoA) based on heterogeneous wireless technologies. They also wish to seamlessly change the PoAs during their ongoing sessions to improve service quality and/or reduce monetary cost. If appropriately handled, multihomed mobile nodes offer a potential solution to this issue. In this sense, the management of multihomed mobile nodes in heterogeneous environment is a key research topic. In this paper, we present an improvement of SIP mobility (pre-call plus mid-call mobility) to support seamless mobility of multihomed mobile nodes in heterogeneous wireless networks. Pre-call mobility is extended to associate user identifier (i.e. SIP URI) and interface identifiers (i.e. IP addresses). The multiple addresses of a mobile device are weighted by the user to create a priority list in the SIP server so as to guarantee resilient reachability of mobile nodes and to avoid unnecessary signaling through wireless links, thus saving radio resources. Then, three variations of mid-call mobility, called hard, hybrid and soft procedures, are also proposed. Their main aim is to minimize, or even avoid, packet losses during interface switching at the mobile node. The proposed solutions have been implemented in a wireless heterogeneous testbed composed of 802.11 WLAN plus 3.5 cellular network, which are fully controlled and configurable. The testbed has been used to study the performance and the robustness of the three proposed mid-call mobility procedures.
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