Service Differentiation in Multi-Rate HSDPA Systems

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Service Differentiation in Multi-Rate HSDPA
Systems

• Hongxia Sun and Carey Williamson
• Department of Computer Science
• University of Calgary

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Motivation (1 of 2)

• Hungry? Need food?
• You cant always get everything you want!
• A classic tradeoff!

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Motivation (2 of 2)

• Mobile? Need Internet?
• You cant always get everything you want!
• Another classic tradeoff!

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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.

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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

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Transmission Rate Formats
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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)

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Simulator Overview

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Example Results (Figure 4)
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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.