speaker: yu-fu huang advisor: dr. kai-wei ke date : 2013, dec. 16
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Speaker: Yu-Fu HuangAdvisor: Dr. Kai-Wei KeDate : 2013, Dec. 16
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
4G LTE architecture
4G LTE architecture
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
An analytical model for power saving
An analytical model for power saving
State 1 to state 1 and state 1 to state 2
State 3 to state 1
Adjustable DRX time state for light sleep
State 2 to state 1 and state 2 to state 3
Transition probability matrix
E[H1] (holding time of S1) calculation
E[H1] (holding time of S1) calculation
E[H2] and E[H3] calculation
E[H2] and E[H3] calculation
Power saving factor (PS)
The probability a packet call delivery start for the ith fixed DRX cycle
The probability a packet call delivery start for the ith adjustable DRX cycle
The mean of wake up delay
TN=10 Tds
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.
Reference• IEEE ICC 2012 - COMMUNICATION SOFTWARE SERVICES
AND MULTIMEDIA APPLICATIONS SYMPOSIUM
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