Network support for mobile multimedia using a self-adaptive distributed proxy
NOSSDAV '01 Proceedings of the 11th international workshop on Network and operating systems support for digital audio and video
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In this dissertation, we examine the problem of performing handoff quickly in cellular data networks. We define handoff as the process of reconfiguring the mobile host, wireless network and backbone wired network to support communication after a user enters a different cell of the wireless network. In order to support applications and protocols used on wired networks, the handoff processing must not significantly affect the typical end-to-end loss or delay of any communications. This dissertation concentrates on two specific areas of handoff processing: routing updates and state distribution. The techniques we use to solve these problems are: 1. Multicast to set up routing in advance of handoff. 2. Hints, based on information from the cellular wireless system, to predict handoff. 3. Intelligent buffering, enabled by the multicast of data, to prevent data loss without the use of complicated forwarding. 4. State replication, enabled by the multicast, to avoid explicit state transfers during the handoff processing. This dissertation describes the design, implementation and evaluation of these techniques in a variety of networking and computing environments. We have shown that any necessary routing updates and be advantageous in the future.