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Service Differentiation in Multi-Rate HSDPA Systems

Service Differentiation in Multi-Rate HSDPA Systems. Hongxia Sun and Carey Williamson Department of Computer Science University of Calgary. Good. Fast. Cheap. Motivation (1 of 2). Hungry? Need food? You can ’ t always get everything you want! A classic tradeoff!. QoS. Thruput.

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Service Differentiation in Multi-Rate HSDPA Systems

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  1. Service Differentiation in Multi-Rate HSDPA Systems Hongxia Sun and Carey Williamson Department of Computer Science University of Calgary IEEE MASCOTS 2009

  2. Good Fast Cheap Motivation (1 of 2) • Hungry? Need food? • You can’t always get everything you want! • A classic tradeoff! IEEE MASCOTS 2009

  3. QoS Thruput Fairness Motivation (2 of 2) • Mobile? Need Internet? • You can’t always get everything you want! • Another classic tradeoff! IEEE MASCOTS 2009

  4. Synopsis of Paper • High-Speed Downlink Packet Access (HSDPA) • Multi-rate high-speed cellular data networking • Problem formulation; iterative greedy solution • Detailed simulation model • Application-layer HTTP traffic model • TCP-like transport layer flow control • HSDPA network model with wireless channels • PF, Global PF, Dynamic GPF, Weighted GPF • Throughput, fairness, or QoS? You decide. IEEE MASCOTS 2009

  5. Codes/Users t HSDPA System Model • High-speed downlink shared channel • Multi-code multiplexing of different users • Maximum number of codes per TTI: 15 • Maximum number of users per TTI: 4 IEEE MASCOTS 2009

  6. SINR Frame Size (bits) Highest Rate (kbps) Num codes Max retrans SINR Frame Size (bits) Highest Rate (kbps) Num codes Max retrans -2.8063 137 68.5 1 4 … … … … … -2.3689 173 86.5 1 4 10.5316 2583 1291.5 4 1 -1.6615 233 116.5 1 4 11.1312 3319 1659.5 5 1 -0.7159 317 158.5 1 4 11.3274 3565 1782.5 5 1 -0.0715 377 188.5 1 4 12.1818 4189 2094.5 5 1 0.7881 461 230.5 1 4 13.5128 4664 2332 5 1 2.5483 650 325 2 4 14.5267 5287 2643.5 5 1 3.7207 792 396 2 4 15.5032 5887 2943.5 5 1 4.7511 931 465.5 2 4 16.5887 6554 3277 5 1 6.7787 1262 631 3 4 17.588 7168 3584 5 1 7.8335 1483 741.5 3 4 18.5 9719 4860 7 1 8.8074 1742 871 3 1 19.5 11418 5709 8 1 10.1075 2279 1139.5 4 1 20.5 14411 7206 10 1 Transmission Rate Formats IEEE MASCOTS 2009

  7. Simulation Model • System: 3-sectored host cell (19 total) • Wireless channel: log-normal fading • User mobility model: random waypoint • Scheduler: PF, GPF, DGPF, WGPF • Traffic model: HTTP with four-level hierarchical structure (e.g., session, packet-call, object, and packet) • Two user priority classes (A and B) IEEE MASCOTS 2009

  8. HTTP traffic arrival control (by TCP) Codes/Users HTTP traffic flow t {Num_user, Num_codes} Scheduler {R_tti} FER retransmit Scheduling Algorithm HTTP traffic flow UE channel situation Simulator Overview IEEE MASCOTS 2009

  9. Example Results (Figure 4) IEEE MASCOTS 2009

  10. Summary • High-Speed Downlink Packet Access (HSDPA) • Multi-rate high-speed cellular data networking • Built detailed HSDPA simulation model • Application-layer HTTP traffic model • TCP-like transport layer flow control • HSDPA wireless cellular network model • PF, GPF, DGPF, and WGPF schedulers • DGPF is promising, but... • Throughput, fairness, or QoS? Your choice. IEEE MASCOTS 2009

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