Access is the killer app" 3 is the vision of the Daedalus project at U.C. Berkeley. Being able to be connected seamlessly anytime anywhere to the best network still remains an unful lled goal. Often, even determining the best" network is a c hallenging task because of the widespread deployment o f o verlapping wireless networks. In this paper, we describe a policy-enabled hando system that allows users to express policies on what is the best" wireless system at any moment, and make tradeo s among network characteristics and dynamics such a s cost, performance and power consumption. We designed a performance reporting scheme estimating current network conditions, which serves as input to the policy speci cation. A primary goal of this work is to make it possible to balance the bandwidth load across networks with comparable performance. To avoid the problem of hando instability, i.e., many mobile hosts making the same hando decision at essentially the same time, we designed randomization into our mechanism. Given the current best" network, our system determines whether the hando is worthwhile based on the hando overhead and potential network usage duration.
Wang et al. describe a handoff system that allows users to express policy about what is the "best" wireless system at the current moment, with the goal of balancing network load among networks with similar performance REF .
Policy-enabled handoffs across heterogeneous wireless networks
Proceedings WMCSA'99. Second IEEE Workshop on Mobile Computing Systems and Applications
Proceedings WMCSA'99. Second IEEE Workshop on Mobile Computing Systems and Applications
Computer Science