Mobility increases the capacity of ad hoc wireless networks
IEEE/ACM Transactions on Networking (TON)
Delay-throughput tradeoff for supportive two-tier networks
ISIT'09 Proceedings of the 2009 IEEE international conference on Symposium on Information Theory - Volume 4
Queueing networks with discrete time scale: explicit expressions for the steady state behavior of discrete time stochastic networks
The capacity of wireless networks
IEEE Transactions on Information Theory
Capacity and delay tradeoffs for ad hoc mobile networks
IEEE Transactions on Information Theory
Optimal throughput-delay scaling in wireless networks - part I: the fluid model
IEEE Transactions on Information Theory
Optimal Delay–Throughput Tradeoffs in Mobile Ad Hoc Networks
IEEE Transactions on Information Theory
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Consider a wireless network of two tiers with different priorities: a primary tier and a secondary tier, which is an emerging network scenario with the advancement of cognitive radio technologies. The primary tier is constructed over static nodes of density n, which are randomly distributed and have an absolute priority to access the spectrum. The secondary tier contains mobile nodes of density m = nβ with β ≥ 2, which can only access the spectrum opportunistically to limit the interference to the primary tier. By allowing the secondary tier to relay the packets for the primary tier, we show that the achievable per-node throughput scaling for the primary tier can be improved to λp(n) = Θ(1/ log n). In the associated delay analysis, two mobility models are considered for the secondary nodes: an i.i.d. mobility model and a random walk model. We show that the primary tier can achieve delay scaling laws of Θ(1) and Θ(1/S) with the two mobility models, respectively, where S is the random walk step size. Furthermore, we show that the primary tier can achieve a delay-throughput tradeoff of Dp(n) = O (nλp(n)) with λp(n) = O (1/ log n) for the random walk model. The throughput and delay scaling laws for the secondary tier are also established, which are the same as those for a stand-alone mobile network.