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POWER-SPEED A Power-Controlled Real-Time Data Transport Protocol for Wireless Sensor-Actuator Networks (Based on the work submitted to WCNC 2007). Y. Zhou, E. Ngai, M. Lyu, and J. Liu Group Meeting 2006-11-21. Outline. Introduction Protocol Design Simulation Study Conclusions.

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y zhou e ngai m lyu and j liu group meeting 2006 11 21

POWER-SPEED A Power-ControlledReal-Time Data Transport Protocolfor Wireless Sensor-Actuator Networks(Based on the work submitted to WCNC 2007)

Y. Zhou, E. Ngai, M. Lyu, and J. Liu

Group Meeting

2006-11-21

Dept. of Computer Science & Engineering

outline
Outline
  • Introduction
  • Protocol Design
  • Simulation Study
  • Conclusions
introduction
Introduction
  • An example wireless sensor network
introduction1

I, robot

I, robot

Introduction

An example wireless sensor-actuator network (WSAN)

introduction2
Introduction
  • Features of WSANs
    • Real-time data transport
    • Mobile data sinks, i.e., the actuator nodes
      • Stateless protocol is highly desired
    • Battery-powered sensor nodes
      • Energy-efficiency is still a critical issue
introduction3
Introduction
  • Existing protocols for WSANs and WSNs
    • Timeliness-domain QoS-guaranteed protocols
      • SPEED, MMSPEED
      • PREI (in MASS’06, by us)
      • Feedback control packets are required
        • To select fitful paths
      • If feedback control packets can be avoided, …
        • It would be
        • This is the focus of this work
introduction4
Introduction
  • Existing protocols for WSANs and WSNs
    • GRP: Geographic Routing Protocol
      • No feedback packets are required.
      • No QoS guarantee
outline1
Outline
  • Introduction
  • Protocol Design
  • Simulation Study
  • Conclusions
protocol design
Protocol Design
  • Selecting next hop neighbor to which packets are forwarded
    • Guarantee in-time delivery
    • Achieve energy-efficiency
  • Examples
    • GRP
    • Shortest-path based protocol
protocol design1
Protocol Design
  • Estimating QoS conditions of downstream links
    • No feedback packets
      • unaware of real QoS data
    • Perform estimation
      • Space domain: delay of upstream links
      • Time domain: historical link delay
protocol design2
Protocol Design
  • Observation
    • Encapsulate data in packet is more energy-efficient than send them individually
    • Example
      • Sending two 32-byte packets cost twice as much energy as sending one 64-byte packet
    • Data on upstream-link conditions can be easily encapsulated in sensor reporting packets
protocol design3
Protocol Design
  • Part of POWER-SPEEDpacket header
protocol design4
Protocol Design
  • Link delay estimation
    • Time domain
    • Space domain
  • SPEED
  • Max hops
protocol design5
Protocol Design
  • Estimate the number of hops if delivering packet to a specific neighbor
  • Candidate
    • Those
    • Required energy to send a packet to this neighbor
  • Energy consumption estimation
  • So, next-hop neighbor is the one that achieves minimum
protocol design6
Protocol Design
  • Summaries
    • POWER-SPEED selects the next-hop neighbor based on the estimation of downstream path quality and the latency-bound requirement of packets. Adaptively it sends a packet
      • that will expire in a longer period of time with lower transmitter power level to save energy
      • that will expire sooner with higher transmitter power level, which results in fewer hop numbers between senders to destination actuators, and thus guarantees that the packet can reach its destination in a shorter period of time.
outline2
Outline
  • Introduction
  • Protocol Design
  • Simulation Study
  • Conclusions
simulations1
Simulations
  • Randomly place 100 nodes. Compare the performance of GRP and POWER-SPEED in terms of energy consumptions
simulations2
Simulations
  • Randomly place 100-250 nodes. Compare the performance of GRP and POWER-SPEED in terms of energy consumptions
simulations3
Simulations
  • Compare the performance of GRP and POWER-SPEED in terms of in-time packet delivery rate
outline3
Outline
  • Introduction
  • Protocol Design
  • Simulation Study
  • Conclusions
conclusion
Conclusion
  • We show a way to achieve real-time data transport without feed-back control packets
  • We propose POWER-SPEED and show the effectiveness of the protocol
slide23
Q & A

Thank You