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