Abstract
A traditional handoff algorithm always adopts stationary channel preservation schemes that cause the increase of call blocking probability (CBP) and the decrease of system utilization to reduce the call dropping probability (CDP) for handoff call. In this paper, the extension theory is introduced and applied to the handoff algorithm for participating handoff decisions and channel preservation. The mobile can perform handoff by predicting user mobility in advance based on extension‐based derivation. By using the simple extension‐based derivation, the required channels can be reserved for handoff call beforehand, and the required quality of service (QoS) is preserved during handoff occurring. Furthermore, both the QoS issue and the efficiency of channel allocation are considered simultaneously for the proposed algorithm. The extension and accumulation concepts are combined for reducing the number of guard channels in the proposed scheme, so the CBP does not reduce too much and the utilization of channel is more efficiency.
Highlights
Due to the rapid evolution of mobile networks, the corresponding applications are varied from low-speed voice data to high-speed multimedia services
In order to define the accumulation function, we find out that the affecting factors that are movement speed and user regular routes are discovered for handoffs
The accumulation function that is derived from the speed of movement, dwell time, and move probability is applied for adjusting the number of guard channels dynamically
Summary
Due to the rapid evolution of mobile networks, the corresponding applications are varied from low-speed voice data to high-speed multimedia services. The most important issue is to support quality of service (QoS) for such large number of required bandwidth to multimedia services in wireless cellular networks. There have been so many studies [1,2,3] proposed for QoS guarantee as well as effective user mobility and resource management have been proposed in [4]. There have been many studies focused on the prediction of user mobility for guaranteeing QoS in cellular networks. The emergency problem of extensive demand of bandwidth for multimedia services in cellular networks is to guarantee QoS and to make the resource utilization efficiency. A proper handoff algorithm that can reserve the required bandwidth for which cell the movement is predicted should be proposed. A handoff algorithm based on extenics derivation is proposed to predict the movement of mobile and to calculate the accumulated attempts of the adjacent cell to which the mobile potentially handoff by combining the extenics theory, user regular routines information, and the speed of mobile movement
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