Throughput and Delay Scaling of General Cognitive Networks 9147 LIntroduction LMotivation and Result Results Yes,if: A1)Primary network operates at a SINR level slightly larger than reception threshold. such that there are opportunities for secondary users. A2)Primary network employs round-robin TDMA style scheduling schemes;or its traffic flows choose relays independently for routing. such that the opportunities are sufficient. A3)rma=o(Rin/R),where R,r are transmission ranges of primary and secondary networks. such that the primary scheduling is "homogeneous"and secondary users can conveniently detect opportunities. 4口40·4E，4色下空1=Throughput and Delay Scaling of General Cognitive Networks 9 / 47 Introduction Motivation and Result Results Yes, if: I A1) Primary network operates at a SINR level slightly larger than reception threshold. I such that there are opportunities for secondary users. I A2) Primary network employs round-robin TDMA style scheduling schemes; or its traffic flows choose relays independently for routing. I such that the opportunities are sufficient. I A3) r γ−2 max = o(R γ min/R 2 max), where R, r are transmission ranges of primary and secondary networks. I such that the primary scheduling is “homogeneous” and secondary users can conveniently detect opportunities