Abstract
In multimedia cellular networks, when a Mobile Host requests multimedia services, it may experience hand-offs to several cells before the request is completely served. If a target cell cannot provide adequate bandwidth for a service request, instead of directly dropping the request, the MH is put into the handoff queue and hopefully the requested bandwidth can be satisfied by later released bandwidth. Obviously, it is important to properly assign priorities for queued handoff of MHs based on their inborn dynamics to avoid unnecessary dropping. In this paper, we present a dynamic handoff priority adjustment scheme which applied a handoff queuing scheme to dynamically adjust handoff priority based on receiving signal strength, service class, and mobility of Mobile Hosts. In addition, idle bandwidth reserved by inactive MHs is reallocated to urgent handoff MHs to reduce the call dropping probability. The goal of the proposed dynamic handoff priority adjustment scheme is to further reduce call dropping probability while still maintaining high bandwidth utilization and acceptable call blocking probability on multimedia cellular networks.
Highlights
In recent years, due to rapid advances in networking technology, providing multimedia service on cellular network becomes feasible
We present a dynamic handoff priority adjustment scheme which applied a handoff queuing scheme to dynamically adjust handoff priority based on receiving signal strength, service class, and mobility of Mobile Hosts
A handoffing Mobile Hosts (MHs) failing to acquire bandwidth from a target cell was inserted into the active or inactive handoff queue based on its mobility
Summary
Due to rapid advances in networking technology, providing multimedia service on cellular network becomes feasible. The on-going call is dropped if the target cell has insufficient bandwidth for continually providing service. Properly assigning priorities based on their inborn dynamics to avoid unnecessary dropping is important for queued handoffing MHs. In multimedia cellular networks, MHs have various characteristics such as requested service class, moving velocity, mobility, and RSS, etc., which can be used to determined the handoff priority of an on-going call. We proposed a dynamic handoff priority adjustment (DHAP) scheme to order queued handoffing requests of MHs. To specify whether a MH is continuously moving or rarely moving, the mobility of a MH was classified into active mode and inactive mode based on a threshold of the moving speed.
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