We establish an O(n log2 n) upper bound on the time for deterministic distributed broadcasting in multi-hop radio networks with unknown topology. This nearly matches the known lower bound of (n logn). The fastest previously known algorithm for this problem works in time O(n3=2). Using our broadcasting algorithm, we develop an O(n3=2 log2 n) algorithm for gossiping in the same network model.

We consider broadcasting in radio networks, modeled as undirected graphs, whose nodes know only their own label and labels of their neighbors. In every step every node acts either as a transmitter or as a receiver. A node acting as a transmitter sends a message which can potentially reach all of its neighbors. A node acting as a receiver in a given step gets a message if and only if exactly one...

The paper concerns time-efficient k-shot broadcasting in undirected radio networks. In a k-shot broadcasting algorithm, each node in the network is allowed to transmit at most k times. Both known and unknown topology models are considered. For the known topology model, the problem has been studied before by Ga̧sieniec et al. [14], who established an upper bound of D + O(kn1/(k−2) log n) and a lo...

This paper deals with broadcasting problem in Vehicular Ad hoc Networks (VANETs). This communication mode is commonly used for sending safety messages and traffic information. However designing an efficient broadcasting protocol is hard to achieve since it has to take into account some parameters related to the network environment, for example the network density, in order to avoid causing radi...

Radio spectrum needed for applications such as mobile telephony, digital video broadcasting (DVB), wireless local area networks (WiFi), wireless sensor networks (ZigBee), and internet of things is enormous and continues to grow exponentially. Since spectrum is limited and the current usage can be inefficient, cognitive radio paradigm has emerged to exploit the licensed and/or underutilized spec...

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