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A-MAC's versatility stems from layering unicast, broadcast, wakeup, pollcast, and discovery above a single, flexible synchronization primitive. A-MAC's efficiency stems from optimizing this primitive and with it the most consequential decision that a low-power link makes: whether to stay awake or go to sleep after probing the channel. Today's receiver-initiated protocols require more time and energy to make this decision, and they exhibit worse judgment as well, leading to many false positives and negatives, and lower packet delivery ratios. A-MAC begins to make this decision quickly, and decides more conclusively and correctly in both the negative and affirmative. A-MAC's scalability comes from reserving one channel for the initial handshake and different channels for data transfer. Our results show that: (i) a unified implementation is possible; (ii) A-MAC's idle listening power increases by just 1.12\u00d7 under interference, compared to 17.3\u00d7 for LPL and 54.7\u00d7 for RI-MAC; (iii) A-MAC offers high single-hop delivery ratios; (iv) network wakeup is faster and more channel efficient than LPL; and (v) collection routing performance exceeds the state-of-the-art.<\/jats:p>","DOI":"10.1145\/2240116.2240119","type":"journal-article","created":{"date-parts":[[2012,9,25]],"date-time":"2012-09-25T23:48:08Z","timestamp":1348616888000},"page":"1-29","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":41,"title":["A-MAC"],"prefix":"10.1145","volume":"8","author":[{"given":"Prabal","family":"Dutta","sequence":"first","affiliation":[{"name":"University of Michigan, MI"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stephen","family":"Dawson-Haggerty","sequence":"additional","affiliation":[{"name":"University of California, Berkeley, CA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yin","family":"Chen","sequence":"additional","affiliation":[{"name":"Johns Hopkins University, Baltimore, MD"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chieh-Jan Mike","family":"Liang","sequence":"additional","affiliation":[{"name":"Microsoft Research Asia, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andreas","family":"Terzis","sequence":"additional","affiliation":[{"name":"Johns Hopkins University, Baltimore, MD"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"320","published-online":{"date-parts":[[2012,9,25]]},"reference":[{"key":"e_1_2_1_1_1","doi-asserted-by":"publisher","DOI":"10.1109\/JSAC.1987.1146521"},{"key":"e_1_2_1_2_1","volume-title":"ARIB STD-T67: Telemeter, telecontrol, and data transmission radio equipment for specified low-power radio station, version 1.1. 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