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Hybrid Power Saving Mechanism for VoIP Services with Silence Suppression in IEEE 802.16e Systems

Hybrid Power Saving Mechanism for VoIP Services with Silence Suppression in IEEE 802.16e Systems

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Hybrid Power Saving Mechanism for VoIP Services with Silence Suppression in IEEE 802.16e Systems

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  1. Hybrid Power Saving Mechanism for VoIP Services with Silence Suppression in IEEE 802.16e Systems Hyun-Ho Choi, Jung-Ryun Lee, and Dong-Ho Cho IEEE Communications Letters Volume 11, Issue 5, May 2007 Page(s):455 - 457

  2. Outline • Introduction • Proposed Hybrid Power Saving Mechanism • Numerical Analysis • Simulation Results • Conclusion

  3. Introduction • IEEE 802.16e (mobile WiMAX) is targeting for Mobile Subscriber Stations (MSSs) • To efficiently manage energy in IEEE 802.16e systems • Sleep-mode operation

  4. Power saving classes (PSCs) • PSC I is used for nonreal-time traffic with bursty behavior • PSC II is designed for real-time traffic, such as VoIP services • Enhanced voice codecs, can use a silence suppression scheme • It is known that silent periods occupy about 60 percent of the total duration of a VoIP call

  5. The overview of the IEEE 802.16e power management (PSC I) 2n until reach its Tmax Fixed size

  6. The overview of the IEEE 802.16e power management (PSC II) Fixed length BS Tk-1 MSs L L L L Sleep mode

  7. When some data to transmit in IEEE 802.16e sleep mode SDU transmission a SDU want to transmit interarrival time TI Response delay BS MOB-TRF-IND MOB-TRF-IND Data Data Data Tk-1 Tk MSs awake mode L L BS MOB-TRF-IND Request Data Data Data Tk-1 Tk MSs awake mode L a SDU want to transmit

  8. Hybrid Power Saving Mechanism Silence Insertion Descriptor (SID) frame

  9. Sleep Interval • PSC I • PSC II • The MS sleeps during a sleep interval with fixed size TS Ti: the length of the i-th sleep interval Tmax: a maximum sleep cycle TP: a minimum sleep cycle TL: listening interval with fixed size

  10. Numerical Analysis • Brady proposed a general six-state model that provides good statistical analysis of two-way conversation 19%

  11. Numerical Analysis • Each MAC SDU is assumed to arrive at an MSS with Poisson process with rate λ (MAC SDUs per unit of time) • 1/λ, equal to TI M: the value of k when Tk= Tmax

  12. Numerical Analysis (cont.) • The probability that there is a arriving SDU during t • At least one arriving MAC SDU in wi sleep cycle

  13. Numerical Analysis (cont.) • The average duration of PSC I • The average buffering delay

  14. Energy Consumption • The energy consumption per unit time in PSC I • The energy consumption per unit time in PSC II

  15. Simulation Results • the frame length is 5 ms • TP=4 frames, TS=3 frames, TL=1 frame, ES=0.045 W, EL=1.5 W • VoIP end-to-end delay requirement: 270 ms • delay constraint: 88 ms • We change the value of Tmaxfrom 4 to 1024

  16. Energy consumption and drop probability vs. Tmax

  17. Conclusion • the proposed HPSM can result • energy being saved by up to 20%, • maintaining a low drop probability of less than 1.9% • The results can be used to select an appropriate value of Tmax according to the various delay constraints to current IEEE 802.16e systems.

  18. THANK YOU!