The obstruction in cellular network involves the problem when a mobile user travels from one cell to another during a call. As adjacent cell do not use the same radio channels, a call must be transferred from one radio channel to another when a user crosses the line between the adjacent cells. The process of handover takes place that transfer an ongoing call from one cell to another cell as the user moves through the coverage area of a cellular network. There are several different reasons needed to be known to determine whether a handover is required. The signal strength of the base station, along signal strengths of the surrounding stations as in addition the availability of the channels also needed to be known. The mobile monitors the strength of the base stations in cellular network to know for the status of channel availability and the network make decision about the handover. The main goal of this research is to investigate the handover research issues and developing schemes which can handle handovers traffic in order to support on-going calls when mobile users are switching between base stations. The final outcomes of the research will theoretical and mathematical approaches to convince the users as possible to provide effective methods for evaluating handover mechanisms as well as cellular network performance.

A wireless personal area network (WPAN), which is virtually a synonym since almost any personal area network would need to function wirelessly. Working on WPAN networks will enable us to gather advance knowledge about ongoing research on WPAN networks and invoke us to contribute new ideas towards WPAN and its emerging services. The main focus of this research is to investigate the different factors which are important for the formation of WPAN. we will propose and investigate novel handover algorithm that causes handover of the Master Device quickly and efficiently in Wireless Personal Area Network. Handover process, which needs to be fast and efficient for it not to have an effect on the mobile user's ongoing communication, occurs when a mobile user migrates to a different channel or to an adjacent cell. The proposed handover algorithm will be presented, modeled and simulated in this paper. WPAN standard have defined two standard handover algorithms based on Reach ability and Stability for the handover of master device in WPAN. These two techniques will be combined and simulated and compared with the battery power selection technique by OPNET modeler. Simulation results presented in this paper is to prove that the initiation of a PAN can be started with a TM, which could readily handover to the acquired PAN node which meets the master device (MD) selection criteria. General TermsHand over process, master device, Reach ability, stability.

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