1. Speaker: Yu-Fu Huang Advisor: Dr. Kai-Wei Ke Date : 2013, Dec. 16

2. Outline LTE and the DRX concept An analytical model for power saving Power saving factor (PS) The mean of wake up delay Numerical results Reference

3. 4G LTE architecture

6. The procedure in the paper System state define Each state probability calculation Expectation of each state holding time Power saving factor The probability of packet call delivery start in DRX cycle The mean of wake up delay

7. An analytical model for power saving

9. State 1 to state 1 and state 1 to state 2 State 3 to state 1

10. Adjustable DRX time state for light sleep

11. State 2 to state 1 and state 2 to state 3

12. Transition probability matrix

13. E[H1] (holding time of S1) calculation

15. E[H2] and E[H3] calculation

17. Power saving factor (PS)

18. The probability a packet call delivery start for the ith fixed DRX cycle

19. The probability a packet call delivery start for the ith adjustable DRX cycle

20. The mean of wake up delay

21. TN=10Tds TN=20 TN=40 Cds TN: light sleep (Adjustable area) TD: deep sleep TA: Active mode Numerical results * TA: Longer (Ti as X-axis)  PS & E[D] in TN10, TN20, TN40, Cds are not much difference. * TN: Longer (Tds as X-axis)  E[D] is shorter & PS is lower due to go into TD lately. * TD: Longer (Tdl as X-axis)  Shorter in TN gets longer E[D] & higher PS.

25. Reference IEEE ICC 2012 - COMMUNICATION SOFTWARE SERVICES AND MULTIMEDIA APPLICATIONS SYMPOSIUM