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A New Energy Efficient Protocol for Minimizing Multi-Hop Latency in Wireless Sensor Networks

A New Energy Efficient Protocol for Minimizing Multi-Hop Latency in Wireless Sensor Networks. M. Dhanaraj, B.S.Manoj, C.Siva Ram Murthy From Indian Institute of Technology, Accepted by PERCOM 2005. Power Saving Strategies for MAC layer data transmission. Basic:

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A New Energy Efficient Protocol for Minimizing Multi-Hop Latency in Wireless Sensor Networks

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  1. A New Energy Efficient Protocol for Minimizing Multi-Hop Latency in Wireless Sensor Networks M. Dhanaraj, B.S.Manoj, C.Siva Ram Murthy From Indian Institute of Technology, Accepted by PERCOM 2005

  2. Power Saving Strategies for MAC layer data transmission • Basic: • Data transmit channel should always sleep, not just idle. • Use a control channel to “wake up” data channel • Compare to Real implementation: • STEM • PTW

  3. Current Problems • Power saving MAC layer schemes can cause longer setup-time in multi-hop data transmission because of the dual frequency radio setup. • When the active time of each node is not synchronized, the wake up signal is transmitted continuously until it receives an ack.

  4. Dual Frequency Radio Setup • Tactive– Active time for control channel • Tsleep– Sleep time for control channel • Ttotal – Tactive + Tsleep • Tdata – Time for data transmission

  5. Setup Time delay in multi-hop data transmission (Stem)

  6. Pipelined Tone Wakeup Scheme • During the node receives data, the receiving node use TONE message to signal all its neighbors to wake up.

  7. Pipelined Tone Wakeup Scheme • Control channel wake up time is very short (several ms)

  8. LEEM – Author proposed approach • Idea: Why don’t we just make a reservation for next hop? • What we need to do so • A synchronized control channel active time based on each node’s routing table • Information for other’s reservation • Additional types of messages • RES – reservation request packet • P-ACK – reservation success ACK • N-ACK – reservation failure ACK

  9. 1 – Hop Ahead Reservation (1-HAR)

  10. N – Hop Ahead Reservation (N-HAR • The number of hops is set by • N = (Tactive + Tsleep)/Tdata

  11. Simulation Status Ttotal: 5s

  12. Simulation Results(1/2)

  13. Simulation Results(2/2)

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