Literature Database Entry


Lei Tang, Yanjun Sun, O. Gurewitz and D.B. Johnson, "PW-MAC: An energy-efficient predictive-wakeup MAC protocol for wireless sensor networks," Proceedings of 30th IEEE Conference on Computer Communications (INFOCOM 2011), Shanghai, China, April 2011, pp. 1305–1313.


This paper presents PW-MAC (Predictive-Wakeup MAC), a new energy-efficient MAC protocol based on asynchronous duty cycling. In PW-MAC, nodes each wake up to receive at randomized, asynchronous times. PW-MAC minimizes sensor node energy consumption by enabling senders to predict receiver wakeup times; to enable accurate predictions, PW-MAC introduces an on-demand prediction error correction mechanism that effectively addresses timing challenges such as unpredictable hardware and delays, operating system and occur, clock drift. PW-MAC also introduces an efficient prediction-based retransmission mechanism to achieve high energy efficiency even when wireless collisions and motes, packets must be retransmitted. We evaluate PW-MAC on a testbed of MICAz and compare it to X-MAC, WiseMAC, and RI-MAC, three previous energy-efficient MAC protocols, under multiple concurrent multihop traffic flows and scenarios, under hidden-terminal and scenarios in which nodes have wakeup schedule conflicts. In all experiments, PW-MAC significantly outperformed these other protocols. For example, evaluated on scenarios with 15 concurrent transceivers in the network, the average sender duty cycle for X-MAC, WiseMAC, and RI-MAC were all over 66%, while PW-MAC's average sender duty cycle was only 11%; the delivery latency for PW-MAC in these scenarios was less than 5% that for WiseMAC and X-MAC. In all experiments, PW-MAC maintained a delivery ratio of 100%.

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Lei Tang
Yanjun Sun
O. Gurewitz
D.B. Johnson

BibTeX reference

    address = {Shanghai, China},
    author = {Tang, Lei and Sun, Yanjun and Gurewitz, O. and Johnson, D.B.},
    booktitle = {30th IEEE Conference on Computer Communications (INFOCOM 2011)},
    doi = {10.1109/INFCOM.2011.5934913},
    isbn = {978-1-4244-9920-5},
    issn = {0743-166X},
    month = {4},
    pages = {1305--1313},
    publisher = {IEEE},
    title = {{PW-MAC: An energy-efficient predictive-wakeup MAC protocol for wireless sensor networks}},
    year = {2011},

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