. Krishnamurthy,1 , N. Mittal, R. Chandrasekaran, and S. Venkatesan
Cognitive radio, multiple channels, multiple receivers, neighbour discovery, distributed algorithm
A cognitive radio (CR) node is a radio device capable of operating (transmitting and receiving) over multiple channels. As a result, a network consisting of one or more CR nodes can adapt to varying channel availability in its geographical region by dynamically changing the channel (or channels) that nodes use for communication. We investigate the problem of neighbour discovery in a network consisting of one or more CR nodes when nodes have multiple receivers but only a single transmitter. Neighbour discovery, in turn, can be used to solve other important communication problems such as broadcasting and gossiping in an efficient manner. We present a TDMA-based deterministic distributed algorithm for neighbour discovery whose time-complexity is M N r + O(max(M, N) log r), where M is the maximum number of channels on which a node can operate, N denotes the size of the space used to assign identifiers to nodes, and r is the number of receivers at a node (with 1 ≤ r ≤ min(M,N)).
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