A Randomized Power Management Protocol with Dynamic Listen Interval for Wireless Ad Hoc Networks
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A Randomized Power Management Protocol with Dynamic Listen Interval for Wireless Ad Hoc Networks Zi-Tsan Chou Vehicular Technology Conference, 2 006 (VTC 2006)
description
A Randomized Power Management Protocol with Dynamic Listen Interval for Wireless Ad Hoc Networks. Zi-Tsan Chou Vehicular Technology Conference, 2006 (VTC 2006). Outline. Introduction R andomized P ower M anagement Protocol Simulation Result Conclusion. - PowerPoint PPT Presentation
Transcript of A Randomized Power Management Protocol with Dynamic Listen Interval for Wireless Ad Hoc Networks
A Randomized Power Management Protocol with Dynamic Listen Interval for Wireless Ad Hoc Networks
Zi-Tsan Chou
Vehicular Technology Conference, 2006(VTC 2006)
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Outline Outline Introduction Randomized Power Management Protocol Simulation Result Conclusion
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Introduction- Introduction- IEEE 802.11 Power
Management
Beacon Frame
Beacon Interval Beacon Interval
Beacon IntervalBeacon Interval
ATIM Window
ATIM Window
ATIM Window
ATIM Window
Sleep
Sleep
Sleep
Sleep
Time
Time
•Fixed size•Power saving•Beacon frame
XX
YY
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Introduction- Introduction- IEEE 802.11 Power
Management
Beacon Frame
Beacon Interval
ATIM Window
Time
Time
XX
YY
ATIMframe
ATIMACK Data
DATAACK
ATIM Window
ATIM Window
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Motivation- Possible forever loss of ATIM frames
IntroductionIntroduction
TimeXXXX
YYTime
Offset (X,Y)=2
Lx=3 beacon intervals
BeaconInterval
ATIM Window
Dynamic Listen Interval
ATIMFrame
ATIMFrame
T1
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Motivation- Waste unnecessary ATIM frames
IntroductionIntroduction
TimeXXXX
YYTime
T2ATIM Window
ATIM
ATIMACK
Data Data-ACK
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Randomized Power Management Protocol
RPM Protocol Eliminate the above-mentioned problems
Possible loss of ATIM frames Waste unnecessary ATIM frames The neighbor maintenance problem
Offer network flexibility in trading energy, latency, and accuracy
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Randomized Power Management Protocol
RPM Protocol Structures of Beacon Intervals Randomized Neighbor Maintenance Data Transfer Procedure Listen Interval Adjustment Procedure
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RPM Protocol- RPM Protocol- Structures of Beacon Intervals
ATIM Window
BeaconWindow
Time
NotificationWindow
Normal beacon interval (NBI)
Sleep
BeaconWindow
BW-only beacon interval (BBI)
Sleep
Sleep beacon interval (SBI)
Sleep
Time
Time
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RPM Protocol-Randomized Neighbor
Maintenance
XX
YY
NBI NBI
NBI NBI
Lx=7 ; β(beacon window ratio)=β/L=4/7
Ly=7 ; β(beacon window ratio)=β/L=4/7
RBI=6
RBI=2
RBI (Remain Beacon Interval)
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RPM Protocol-Randomized Neighbor
Maintenance Birthday paradox
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RPM Protocol-Data Transfer Procedure
Cache neighbor table MAC address, Listen Interval, RBI, the last update ti
me(Tlast) If X has a cached record about the Y
X can thus predict when Y will wake up according to Ly and its RBI.
When X has data frames for Y, X waits for the coming of Y's Notification Window.
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RPM Protocol-Listen Interval Adjustment
Procedure According to battery power or Qos considerati
on Lx=15, βx=0.4, βmin=0.2, £=0.07
Sx=[1.986]=2
XX
Lx=3 beacon intervalLx=3 beacon interval
Lx=4 beacon interval
RBI=2LI=3
RBI=2LI=4
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Simulation Result Assumptions:
Ps stations:20 Channel data rate:11Mbps Beacon frame length:61 bytes Beacon interval:100ms ATIM Window:25ms Beacon Window:8 Notification Window:25
Power consumption Doze state to awake state:0.575 mJ
transmit receive listen doze
1.65W 1.4W 1.15W 0.045W
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Simulation Result
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Simulation Result
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Conclusion RPM Protocol
PS station adjusts its listen interval dynamically Offer the network flexibility
Trading energy,latency, and neighbor discovery probability
Achieve reduction in power consumption at the expense of only a little additional delay.
