Consider a random access communication scenario over channel whose operation is defined for any number of possible transmitters. As in the model recently introduced by Polyanskiy Multiple Access Channel (MAC) with fixed, known transmitters, assumed to be invariant permutations on its inputs, and all active transmitters employ identical encoders. Unlike model, proposed scenario, neither nor rece...

The increase number of mobile users in wireless environment affects query access time substantially. To minimise the query access time, one possible way is to employ data broadcasting strategy. In this paper, we propose cost models for both query access time over broadcast channel and on-demand channel. We examine the cost models to find optimum number of broadcast items in a channel while util...