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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 LettersVolume 11, Issue 5, May 2007 Page(s):455 - 457
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Outline
Introduction Proposed Hybrid Power Saving Mechanism Numerical Analysis Simulation Results Conclusion
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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
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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
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The overview of the IEEE 802.16e power management (PSC I)
2n until reach its TmaxFixed size
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The overview of the IEEE 802.16e power management (PSC II)
BS
MSsL
Tk-1
Sleep mode
L L L
Fixed length
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When some data to transmit in IEEE 802.16e sleep mode
BS
MSsL
Tk
a SDU want to transmit
MO
B-T
RF
-
IND
L
MO
B-T
RF
-
IND
Tk-1
awake mode
Dat
a Dat
a Dat
a
BS
MSs
Tk
a SDU want to transmit
LM
OB
-TR
F-
IND
Tk-1
awake mode
Dat
a Dat
a Dat
a Reque
st
Response
delay
SDU transmission
interarrival time TI
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Hybrid Power Saving Mechanism
Silence Insertion Descriptor (SID) frame
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Sleep Interval
PSC I
PSC II The MS sleeps during a sleep interval with fixed si
ze TS
Ti: the length of the i-th sleep interval
TL: listening interval with fixed size
Tmax: a maximum sleep cycle TP: a minimum sleep cycle
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Numerical Analysis
Brady proposed a general six-state model that provides good statistical analysis of two-way conversation
19%
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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
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Numerical Analysis (cont.)
The probability that there is a arriving SDU during t
At least one arriving MAC SDU in wi sleep cycle
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Numerical Analysis (cont.)
The average duration of PSC I
The average buffering delay
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Energy Consumption
The energy consumption per unit time in PSC I
The energy consumption per unit time in PSC II
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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 Tmax from 4 to 1024
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Energy consumption and drop probability vs. Tmax
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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 appropri
ate value of Tmax according to the various delay constraints to current IEEE 802.16e systems.
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THANK YOU!
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