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In this paper, the authors study the impact of mobility heterogeneity on the capacity and delay scaling laws in cognitive radio network. They propose the heterogeneous speed-restricted mobility model for SUs, and put forward the corresponding routing and scheduling scheme which exploits the heterogeneity of SUs. In particular, they show that when the mobility heterogeneity of secondary users increases, the delay-capacity tradeoff for both primary and secondary network can be improved. Under the optimal condition, the primary network and part of the secondary network can achieve near-constant (except for polylogarithmic factor) capacity and delay scalings.
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