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Code Review of SOWN Demo SentrySelection Model

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1. Code Review of SOWN Demo --- SentrySelection Model. By: Gang Zhou. Computer Science Department. University of Virginia. May 2004. 2. Outline. Interface Description ... – PowerPoint PPT presentation

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Title: Code Review of SOWN Demo SentrySelection Model


1
Code Review of SOWN Demo--- SentrySelection Model
  • By Gang Zhou
  • Computer Science Department
  • University of Virginia
  • May 2004

2
Outline
  • Interface Description
  • Component Description
  • Tunable Parameters
  • Module Overview
  • Timers in code
  • Phases in code
  • Node Behavior in different Phases

3
Timers and Phases
  • Two Timers
  • PhaseTimer --- control the four phases
  • BeaconTimer --- keep periodical beaconing
  • Four Phases
  • SEL_CHAOS
  • No much to say
  • START_UP
  • Each node calculate information of the
    neighborhood
  • DECLARE
  • Decide sentry nodes and declare them
  • SEL_STOP
  • No much to say

4
Phase---START_UP
  • What to beacon during the phase?
  • My ID
  • SentryID
  • Num_covered
  • Num_sentries
  • Num_nonsentries
  • Voltage

5
Phase---START_UP
  • What to do when a beacon is received?
  • Update neighborhood status
  • Num_sentries
  • Num_nonsentries
  • Num_covered
  • What to do at the end of this phase?
  • Back off
  • The larger the num_nonsentry, the less the back
    off time
  • The higher the energy, the less the back off time
  • Start the first beacon of DECLARE phase after the
    back off

6
Phase---DECLARE
  • If the following two conditions are satisfied, I
    will declare myself as an entry
  • I am not a sentry
  • I didnt hear from a sentry
  • Only when a node decides to be a sentry, it will
    beacon.
  • What to beacon during the phase?
  • My ID
  • SentryID
  • Num_covered
  • Num_sentries
  • Num_nonsentries
  • Voltage

7
Phase---DECLARE
  • What to do when a beacon is received?
  • Update neighborhood status
  • Num_sentries
  • Num_nonsentries
  • Num_covered
  • If I am not a sentry and I hear from a sentry, I
    will set that node as my sentry
  • What to do at the send of this phase?
  • Schedule to enter into SEL_STOP phase after 1
    second
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