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\section{Design of EASM}
\label{sec:easm}

This section describes the design of the Energy-efficient Arbitrary
Sink Mobility (EASM) data dissemination protocol for wireless sensor
networks. We first describe the design principles and architecture of
EASM. We then describe the fault tolerant design characteristics of
EASM. 

In designing EASM we have made the following assumptions about a
wireless sensor network~\cite{Pottie:00,RB:03,Hill2000}.
% Andy following references, made similar assumptions in these
% papers as well.
% G Pottie, W Kaiser. Wireless Integrated Network Sensors. Comm.
% of ACM, 2000.
% A Cerpa et al., Application Driver for wireless communications
% technology ACM sigcomm workshop on data communication in latin
% america 2001.
% J Hill et al., System Architecture Directions for Networked
% sensors. ASPLOS-IX, 2000.

% Amogh, we need to give one sentence description on why these are
% valid assumptions. I made an attempt. Please make necessary
% changes. 
\begin{enumerate}
  \item {\bf Nodes other than sink nodes are stationary} -- Mobility
  of sink nodes in a sensor network is a desired feature for many
  applications since it enhances data collection and querying
  efficiency, and improves sensor network management by identifying
  and/\-or reprogramming sensor nodes. On the other hand it is
  desirable to have the sensor nodes stationary to alleviate
  challenges of route changes.
  \item {\bf Nodes are aware of their own location} -- It is expected
  that sensor nodes will be location aware by leveraging schemes such
  as GPS~\cite{GPS:01}.  Even if every node may not have GPS
  capability, it is conceivable that GPS capabilities could be
  provided to groups of sensor nodes.
  \item {\bf Data aggregation} -- EASM assumes that data kept
  at source node is in the form of a summary.  Aggregation is thus
  not required~\cite{RB:03} for our scheme.
\end{enumerate}

\input{easm_detail}

\input{easm_replication}

\input{easm_analytical}

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