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Goals of this chapter • Controlling when to send a packet and when to listen for a packet are perhaps the two most important operations in a wireless network • Especially, idly waiting wastes huge amounts of energy • This chapter discusses schemes for this medium access control that are • Suitable to mobile and wireless networks • Emphasize energy-efficient operation SS 05 Ad hoc & sensor networs - Ch 5: MAC protocols 2
Overview • Principal options and difficulties • Contention-based protocols • Schedule-based protocols • IEEE 802.15.4 SS 05 Ad hoc & sensor networs - Ch 5: MAC protocols 3
Page 1: Ad hoc and Sensor Networks Chapter
Page 5 and 6: Requirements for energy-efficient M
Page 7 and 8: Centralized medium access • Idea:
Page 9 and 10: Overview • Principal options and
Page 11 and 12: Main options to shut up senders •
Page 13 and 14: RTS/CTS • RTS/CTS ameliorate, but
Page 15 and 16: Sensor-MAC (S-MAC) • MACA’s idl
Page 17 and 18: Timeout-MAC (T-MAC) • In S-MAC, a
Page 19 and 20: B-MAC • Combines several of the a
Page 21 and 22: Power Aware Multiaccess with Signal
Page 23 and 24: Overview • Principal options and
Page 25 and 26: LEACH rounds SS 05 Ad hoc & sensor
Page 27 and 28: SMACS link setup • Case 1: Node X
Page 29 and 30: TRAMA - adaptive election • Given
Page 31 and 32: Comparison: TRAMA, S-MAC • Compar
Page 33 and 34: IEEE 802.15.4 • IEEE standard for
Page 35 and 36: Wakeup radio MAC protocols • Simp
Page 37: Summary • Many different ideas ex

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