The IEEE 802.15.4 standard is a rapidly growing technology for short-range communications and low rate Wireless personal area networking. The standard has been widely accepted as the de facto standard for wireless sensor network (WSN) because of its low cost deployment and remarkable applications. The mobility management in the existing WSN has highly suffered from different issues like high packet loss and delay because the current mobility management in IEEE 802.15.4 lacks the support of handover management for real-time streaming applications. In this paper, we propose a new fast handoff mechanism which eradicates the scanning delay. The proposed scheme uses the information of link quality (LQ) of the neighboring coordinators (COs), and on the basis of this information it selects an appropriate CO for handoff. The proposed scheme is evaluated through extensive simulations which show its strength and accuracy in the context of switching of high streaming data from one CO to another.

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The unlicensed incumbents must be offered seamless communications on other unused channels in TV white space. It must provide communication processes among competing users through the proper allocation of available resources. It is important to quickly organize a new network connection or to join to a new network rapidly. In this paper, we studied the limitations of the current distributed beaconing network in initial access time and proposed a modified selection mechanism and a dispersion mechanism of beacon slot for a successful, much faster joining process within the initial access time for enabled unlicensed incumbents. We also described how the proposed mechanism helps minimize initial access time, carry out joining processes within the maximum initial access time, regardless of whether or not there is a beacon collision in an existing beacon period.

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