We establish lower bounds on the capacity of wireless ad hoc networks with two types of non-uniform traffic patterns. We first focus on the impact of traffic patterns where local communication predominates and show the improvement in terms of per user-capacity over ad hoc networks with unbounded average communication distances. We then study the capacity of hybrid wireless networks, where long-distance relaying is performed by a fixed overlay network of base stations. We investigate the scaling of capacity versus the number of nodes and the density of base stations in the area of the network. The throughput capacity results under these two scenarios hold with probability one as the number of nodes goes to infinity.
Absnacl-In this work, we are interested in characterizing the performance of decentralized multiple-access and retransmission schemes for wireless ad hoc networks. We are considering a regular linear network model of sender/receiver pairs, where nodes transmit their information messages over a common radio channel. W e obtain expressions for node throughput as a function of inter-node separation for different retransmission protocols while communications are donein a single-hop fashion. Then we extend our model to take into account relaying between nodes. We analyze the achievable throughput under iraffic patterns where local communication predominates, as a function of transmission distance and relay distance. Our analysis focuses on static ad hoc nehvorks where we show that coding and retransmission provide reliable communication with a completely decentralized multipleaccess strategy for both single-hop and multi-hop communications.
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