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Ns2 Pegasis Routing Protocol

In this section we are going to see about the Ns2 pegasis routing protocol.

What is pegasis?

  • The PEGASIS (Power-Efficient Gathering in Sensor Information Systems) protocol forms a chain of the sensor nodes and the chain is formed using a greedy approach, starting from the node farthest to the sink node.
  • It’s one of the clustering routing protocol. 



Steps involved in pegasis:

  • Chain construction.
  • Gathering data.

Types of pegasis routing protocol:

  • Improved energy efficient pegasis based protocol (IEEPB).
  • H-pegasis.
  • Energy Efficient PEGASIS Based (EEPB).
  • Pegasis-ANT.
  • Pegasis with double cluster head (PDCH).

Sample Ns2 code for Pegasis routing Protocol:

set opt(tr)           "$opt(dirname)/pegasis.tr"   ;# Trace file
# Need to spread the data by k+1
set opt(spreading)    [expr $opt(num_clusters)+1]

set outf [open "$opt(dirname)/conditions.txt" w]
puts $outf "\nUSING PEGASIS:\n"
close $outf

# Parameters for centralized control cluster formation algorithm
set opt(adv_info_time)    [TxTime [expr $opt(hdr_size) + 12]]
set opt(finish_adv)       [expr $opt(nn_) * $opt(adv_info_time)]
set opt(bs_setup_iters)   1000            ;# Num iters for sim. annealing alg.
set opt(bs_setup_max_eps) 10              ;# Max change for sim. annealing alg.

set outf [open "$opt(dirname)/conditions.txt" a]
puts $outf "Desired number of clusters = $opt(num_clusters)"
puts $outf "Spreading factor = $opt(spreading)"
puts $outf "Changing clusters every $opt(ch_change) seconds\n"
close $outf

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