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.

The Ad-hoc On-demand Distance Vector (AODV) is the most typical reactive routing protocol in MANET. It has been extensively studied through not only computer simulations but also implementations on real network. In this paper, an implementation of AODV routing protocol with multi-metric was presented. In the implementation, an Uppsala University routing protocol; AODV-UU was modified in order to apply multimetrics. Moreover, both AODV-UU and modified AODV-UU were implemented within a Linux-based testbed: a real ad-hoc network. Finally, the performance of both protocols was evaluated experimentally.

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