HEED: Hybrid Energy Efficient Distributed Clustering Part 1

HEED: Hybrid Energy Efficient
Distributed Clustering
Shannon Seefeld

What is HEED
 HEED was designed to select different
cluster heads in a field according to the
amount of energy that is distributed in
relation to a neighboring node.

Goals of HEED
 Four primary goals:
 prolonging network life-time by distributing
energy consumption
 terminating the clustering process within a
constant number of iterations/steps
 minimizing control overhead
 producing well-distributed cluster heads
and compact clusters.

What is Clustering?
 We find that clustering plays a dominant
role in delaying the first node death, while
aggregation plays a dominant role in
delaying the last node death
 In each cluster one node acts as a cluster
head which is in charge of coordinating
with other cluster heads

Alternatives
 To increase energy efficiency and prolong
network lifetime we can consider intra cluster
communication cost as a secondary clustering
parameter.
 Intra clustering communication involves
communicating with other cluster heads
 Cost is a function of cluster properties and
whether power levels are permissible for
transmission within a cluster

Advantages
 HEED distribution of energy extends the lifetime
of the nodes within the network thus stabilizing
the neighboring node.
 Does not require special node capabilities, such as
location-awareness
 Does not make assumptions about node
distribution
 Operates correctly even when nodes are not
synchronized.

Advantages Cont.
 Creates well distributed clusters
 Terminates in constant time
 Requires only local communication
 Reduces energy load
 Extends network lifetime

Advantages Cont.
 The advantages of HEED are that nodes
only require local (neighborhood)
information to form the clusters
 the algorithm terminates in O(1) iterations
 the algorithm guarantees that every sensors
is part of just one cluster, and the cluster
heads are well-distributed.

Disadvantages
 the random selection of the cluster
heads,may cause higher communication
overhead for:
 the ordinary member nodes in communicating
with their corresponding cluster head
 cluster heads in establishing the communication
among them, or
 between a cluster head and a base station.
 the periodic cluster head rotation or election
needs extra energy to rebuild clusters.

WSN limitations
 Communication
 Bandwidth is limited and must be shared
among all the nodes in the sensor network
 Spatial reuse essential
 Efficient local use of bandwidth needed

WSN Limitations Cont.
 Sensor energy
 Each sensor node has limited energy supply
 Nodes may not be rechargeable
 Eventually nodes may be self-powered
 Energy consumption in sensing, data processing,
and communication
 Communication often the most energy-intensive
 For some sensors, sensing may also be energy-
intensive
 Must use energy-conserving protocols

Bibliography
 http://www.sigmobile.org/mobicom/2003/p
osters/14-Younis.pdf
 http://www.cs.purdue.edu/homes/fahmy/pa
pers/heed.pdf
 http://www.ece.rochester.edu/courses/
ECE245/lectures/Lecture22-23.pdf

HEED: Hybrid Energy Efficient Distributed Clustering Part 1

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