Zi-Tsan Chou Networks and Multimedia Institute VTC 06 Fall A Deterministic Power Management Protocol with Dynamic Listen Interval for Wireless Ad Hoc Networks Zi-Tsan Chou Networks and Multimedia Institute VTC 06 Fall

Outline Introductions APM Protocol Numerical Results Conclusions

Introductions

Introductions- Power Saving Mode

Introductions - Motivation Challenges of IEEE 802.11 PSM Transmission opportunity The problem of forever loss of ATIM frames The efficient of energy use The listen interval of Q is very large

Introductions- Transmission opportunity The problem of forever loss of ATIM frames

Introductions - The Efficient of Energy use The listen interval of Q is very large

Introductions -Related Work Dynamic listen interval AQEC

Introductions - Goal & contribution Dynamic listen interval adjustment ability Eliminate the possibly forever loss of ATIM frames the unnecessary waste of ATIM frames the neighbor maintenance problem

APM Protocol Three types of beacon interval Normal Beacon Interval (NBI) Beacon Window: Beacon frame Beacon frame: Listen Interval, Remaining number of BIs(RBI), MAC address, timestamp, and other management parameter. Notification Window: ATIM , ATIM ACK BW-only Beacon Interval (BBI) Sleep Beacon Interval (SBI) Doze off during the entire BI

APM Protocol – three beacon interval 802.11 PSM Listen interval ATIM Window APM Listen interval NBI BBI SBI ATIM Window Beacon Window Notification Window

APM Protocol P Q LP* x+bp+1=O(P,Q)+LQ*y+bq+1 Listen interval=7 1 2 3 4 1 2 3 4 5 6 1 P LP* x+bp+1=O(P,Q)+LQ*y+bq+1 RBIQ=1 RBIP=2 Offset=2 1 2 1 2 Q Listen interval=3 Beacon Window Notification Window

APM Protocol P Q LP* x+bp+1=O(P,Q)+LQ*y+bq+1 5* x=3+5*y+bq ,bq={0,1,2} 1 2 3 4 P Data RBIP=0 ATIM ACK ATIM 1 2 3 4 O(P,Q)=3 Q t0 t1 5* x=3+5*y+bq ,bq={0,1,2} => y=1 ,bq=2 x=2

APM Protocol- Design BI sets Zero-embracing selection This property states that B naturally includes 0. Prime-cardinality universe This property requires that L must be one or an odd prime. Nonempty rotation-intersection

APM Protocol- Prime-cardinality universe P and Q always miss windows

APM Protocol- Nonempty rotation-intersection W.S. Luk and T.T. Wong, “Two New Quorum Based Algorithms for Distributed Mutual Exclusion,” IEEE International Conference on Distributed Computing Systems, pp. 100–106, 1997. M. Maekawa, “A algorithm for mutual exclusion in decentralized systems,” ACM Trans. Comput. Systs., pp. 145-159, May 1985.

APM Protocol- Nonempty rotation-intersection N=8 ,B0={0,1,2,4}

Numerical Results Single hop MANET 20 PS stations Data rate : 11M Beacon frame : 61 bytes Power consumed Transmit: 1.65 W Receive: 1.4 W Listen: 1.15 W Doze: 0.045 W Transition between doze and awake: 0.575 mJ Beacon Interval: 100 ms ATIM Window: 25 ms In APM: Beacon Window: 8 ms Notification Window: 17 ms

Numerical Results

Numerical Results

Numerical Results

Conclusions The author proposed a mechanism that Stations could dynamically adjust its listen interval. Solves three difficulties in 802.11 power saving mechanisms.