Delay-throughput tradeoff for supportive two-tier networks

  • Authors:
  • Long Gao;Rui Zhang;Changchuan Yin;Shuguang Cui

  • Affiliations:
  • Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX;Institute for Infocomm Research, A*STAR, Singapore;Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX;Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX

  • Venue:
  • ISIT'09 Proceedings of the 2009 IEEE international conference on Symposium on Information Theory - Volume 4
  • Year:
  • 2009

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Abstract

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 n, which have an absolute priority to access the spectrum. The secondary tier consists of randomly distributed cognitive 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 route the packets for the primary tier, we show that the primary tier can achieve a throughput scaling of λp(n) = Θ(1/logn) per node and a delay-throughput tradeoff of Dp(n) = Θ (√nβlognλp(n)) for λp(n) = O (1/log n), while the secondary tier still achieves the same optimal delay-throughput tradeoff as a stand-alone network.