1 research outputs found

    Delay-Throughput Tradeoff for Supportive Two-Tier Networks

    Full text link
    Consider a static wireless network that has two tiers with different priorities: a primary tier vs. a secondary tier. The primary tier consists of randomly distributed legacy nodes of density nn, which have an absolute priority to access the spectrum. The secondary tier consists of randomly distributed cognitive nodes of density m=nβm=n^\beta with β2\beta\geq 2, which can only access the spectrum opportunistically to limit the interference to the primary tier. By allowing the secondary tier to route the packets for the primary tier, we show that the primary tier can achieve a throughput scaling of λp(n)=Θ(1/logn)\lambda_p(n)=\Theta(1/\log n) per node and a delay-throughput tradeoff of Dp(n)=Θ(nβlognλp(n))D_p(n)=\Theta(\sqrt{n^\beta\log n}\lambda_p(n)) for λp(n)=O(1/logn)\lambda_p(n)=O(1/\log n), while the secondary tier still achieves the same optimal delay-throughput tradeoff as a stand-alone network.Comment: 5 pages, 1 figure, submitted to ISIT 200
    corecore