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後卓越計畫 成果報告 楊舜仁老師實驗室 2005.12.5

後卓越計畫 成果報告 楊舜仁老師實驗室 2005.12.5. Outline. Our Previous Work Modeling UMTS Discontinuous Reception (DRX) Mechanism A Novel Analytic Model for UMTS DRX with Bursty Packet Data Traffic Analytic Model Numerical Results. UMTS MS Receiver Activities. An M / G /1 Vacation Model (1).

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後卓越計畫 成果報告 楊舜仁老師實驗室 2005.12.5

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  1. 後卓越計畫 成果報告 楊舜仁老師實驗室 2005.12.5

  2. Outline • Our Previous Work • Modeling UMTS Discontinuous Reception (DRX) Mechanism • A Novel Analytic Model for UMTS DRX with Bursty Packet Data Traffic • Analytic Model • Numerical Results 2

  3. UMTS MS Receiver Activities 3

  4. An M/G/1 Vacation Model (1) • Input parameters • Poisson packet arrivals with rate λa • Packet service time txwith mean 1/λx and variance Vx • The inactivity timer threshold tI • The DRX cycle tD • The cost of wakeup ζ 4

  5. An M/G/1 Vacation Model (2)  The UMTS DRX is modeled as a variant of the M/G/1 queue with multiple vacations. • Output measures • Mean packet waiting time E[tw] • Power saving factor Ps 5

  6. Bursty Packet Data Traffic • Geometric (Exponential) inter-packer arrival time • Cut-off Pareto packet size • Geometric number of packet calls in a session • Geometric number of packets in a packet call • Geometric (Exponential) reading time 6

  7. An Embeded Markov Chain Model • State 1: Busy period + Inter-packet • call idle period • State 2: Busy period + Inter-session • idle period • State 3: Sleep period entered from State 1 • State 4: Sleep period entered from State 2 7

  8. Analytic Model (1) • The derivation of power saving factor Ps • Total time • Sleep time • Ps = Sleep time / Total time 8

  9. Analytic Model (2) • The derivation of mean packet waiting time E[tw] • Number of packets • Total waiting time • E[tw] = Total waiting time / Number of packets 9

  10. Effect of tipc on Ps and E[tw] 10

  11. Effect of tis on Ps and E[tw] 11

  12. Effect of tI on Ps and E[tw] 12

  13. Effect of tD on Ps and E[tw] 13

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