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Receiver informs interferers before transmission – MACA • Sender B asks receiver C whether C is able to receive a transmission Request to Send (RTS) • Receiver C agrees, sends out a Clear to Send (CTS) • Potential interferers overhear either RTS or CTS and know about impending transmission and for how long it will last • Store this information in a Network Allocation Vector • B sends, C acks ! MACA protocol (used e.g. in IEEE 802.11) SS 05 Ad hoc & sensor networs - Ch 5: MAC protocols 12
RTS/CTS • RTS/CTS ameliorate, but do not solve hidden/exposed terminal problems • Example problem cases: SS 05 Ad hoc & sensor networs - Ch 5: MAC protocols 13
Page 1 and 2: Ad hoc and Sensor Networks Chapter
Page 3 and 4: Overview • Principal options and
Page 5 and 6: Requirements for energy-efficient M
Page 7 and 8: Centralized medium access • Idea:
Page 11: Main options to shut up senders •
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 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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