Device-transparent network-layer handoff for micro-mobility

F. Guo, T. Chiueh
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引用次数: 3

Abstract

An emerging class of applications for enterprise wireless LANs (WLAN) is voice over IP (VoIP) applications, which impose a stringent requirement on end-to-end delay. Because access points on an enterprise WLAN tend to be associated with different IP subnets, support for network-layer handoff is indispensable. Moreover, the handoff frequency is expected to be much higher for WLANs than for cellular networks because the coverage of a WLAN access point is much smaller. Although mobile IP is a mature solution to the network-layer handoff problem, no known mobile IP implementation on IEEE 802.11 WLANs can reduce the handoff latency below 100 msec, a nominal requirement for VoIP applications. This paper describes a novel Ethernet-over-IP overlay network architecture that completely does away with network-layer handoff, and thus reduces the end-to-end handoff delay to that of link-layer handoff, which is supported by WLAN hardware directly. In addition, the proposed wireless overlay network (WON) architecture, which has been implemented in a commercial WLAN access point, represents the first mobility solution that allows a mobile device to maintain its network connections while roaming across different IP subnets without requiring any modification on the mobile device. As a result, the proposed architecture can automatically provide seamless network-layer handoff to a wide variety of mobile devices (such as PDA, portable, cell phone) running on different operating systems, as long as they are equipped with 802.11 network interface.
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用于微移动性的设备透明网络层切换
企业无线局域网(WLAN)的一种新兴应用是IP语音(VoIP)应用,它对端到端延迟提出了严格的要求。由于企业WLAN上的接入点往往与不同的IP子网相关联,因此对网络层切换的支持是必不可少的。此外,由于WLAN接入点的覆盖范围要小得多,因此预计WLAN的切换频率要比蜂窝网络高得多。虽然移动IP是解决网络层切换问题的成熟解决方案,但在IEEE 802.11 wlan上没有已知的移动IP实现可以将切换延迟降低到100毫秒以下,这是VoIP应用的标称要求。本文描述了一种全新的Ethernet-over-IP覆盖网络体系结构,该体系结构完全取消了网络层切换,从而将端到端切换延迟降低到链路层切换延迟,并直接由WLAN硬件支持。此外,所提出的无线覆盖网络(WON)架构(已在商用WLAN接入点中实现)代表了第一个移动解决方案,该解决方案允许移动设备在漫游不同IP子网时保持其网络连接,而无需对移动设备进行任何修改。因此,所提出的架构可以自动提供无缝的网络层切换到运行在不同操作系统上的各种移动设备(如PDA、便携式、蜂窝电话),只要它们配备了802.11网络接口。
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