Design And Implementation For Generating White Space In A Wi-Fi Like Connectivity Amit G. Fulsunge 1 and Prof. Nikhil P. Wyawahare 2 1 PG student of Electronics Engg.,G.H.Raisoni College of Engg.India 2 Department of Electronics Engg.,G.H.Raisoni College of Engg. India Abstract In Time division multiple accessing scheme, all nodes are allotted particular fixed duration time slot in which they must transmit or receive the packets related to their messages. Some nodes may have a real time stream or urgent-delivery packets to transmit. In such situation, nodes transmitting urgent-delivery or emergency messages may have to wait for their respective time slot to arrive in order to transmit. To overcome this problem, in this paper, an idea has been proposed to provide free time slot or to generate White Space in Time domain. These White Spaces can be provided to the nodes which have urgent – delivery or high priority messages to transmit. This work may find its application in military wireless nodes communication, wireless sensor networks and wireless body area networks in e-healthcare, top priority government organisation’s intranet which employs Wi- Fi connectivity etc... This paper proposes design and implementation for generating White Space in Wi-Fi connectivity. . 1. Introduction Time division multiple accessing scheme proves to be an energy efficient channel accessing scheme. Wireless communication systems which have to follow strict limited frequency usage can utilize the advantage of TDMA. In any wireless communication systems employing TDMA, all communicating nodes are allotted particular fixed duration time slots in which they must transmit the packets related to their messages. These messages can be of high priority or low priority type. Sometimes, situation may arise where some of the nodes may have packets related to a higher priority message for transmission. But then these nodes will have to wait for their respective time slot to arrive in order to transmit those packets. For example, consider a scenario like health-monitoring wireless sensor nodes communication system where some nodes may be transmitting critical data sensed by their underlying sensors. In such a case, waiting for time slots to initiate transmission by these nodes may result in a hazardous situation. Even in military wireless sensor nodes communication system based on TDMA scheme, waiting for respective time slot to arrive in order to transmit real time data stream may prove disastrous. This problem, in any wireless fidelity i.e. Wi-Fi connectivity which employs TDMA based accessing scheme, gave an idea to generate White Space in time domain. These White Spaces can be used to transmit urgent – delivery or high priority messages. This work may also find its application in Wi-Fi connectivity within an intranet of any top priority government organisation. In any emergency situation, when the network jams, the urgent-delivery messages can be transmitted by using generated White Space. Scope of this paper is limited with the design and implementation for generating White Space in Wi-Fi connectivity and is not extended to the contention problem and time delay constraints that are related particularly with a TDMA based system. Here the term Wi-Fi relates to wireless fidelity so the scope of this paper assumes wireless fidelity connectivity and the main concentration is on to generate the white space. The contents in the following sections are as follows. Section II discusses about the proposed idea behind generation of White space. Section III presents the VHDL design and implementation. Section IV shows the simulation results. Section V gives the conclusion and future work to be carried out. 2. Proposed Idea The main objective in this paper is to generate white space and to provide this generated white space to the node having highest priority message’s packet. The TDMA frame format for this proposed work is illustrated in section II-A. Algorithm for generating International Journal of Engineering Research & Technology (IJERT) Vol. 2 Issue 3, March - 2013 ISSN: 2278-0181 1 www.ijert.org