Performance evaluations of path optimization schemes for inter-switch handoffs in wireless ATM networks
Wing-Hin Wong, Henry C. B. Chan, Victor C. M. Leung · 1998
One of the major design issues in wireless Am is the support of inter-switch handoffs.An inter-switch handoff occurs when a mobile terminal moves to a new base station connecting to a different switch.Recently a two-phase handoff protocol has been proposed to address this issue.It employs path extension to process the handoff request immediately, followed by possible path optimization to reduce the path cost.To implement the two-phase handoff protocol efficiently, we need to determine when to trigger path optimization.~s paper presents three path optimization schemes, namely: mponential, periodic, and Bernoulli, for the twm phase handoff protocol.A discrete time analytical model is proposed to enable evaluations and comparisons of the expected connection coss between these schemes.A major result is the closed form expression of the expected cost and its minimization at the optimal operating point for each scheme, derived from the andyticd model.Numerical resul~indicate that the performance of all three schemes are comparable, with the Bernoulli scheme outperforming the other two schemes.-F~-.