Abstract:
Wireless sensor network is an infrastructure contained of sensing (measuring), computing, and
communication elements having capability of self-organizing, lightweight sensor nodes that are
used to cooperatively monitor physical or environmental conditions. This network become an
essential technology that applied in many applications areas such as in military, agricultural, health
care, and many other areas. This thesis addresses the problem of reliable data transfer in wireless
sensor network. In such networks, the principal challenge in the design of transport protocol is that
the sensor’s node deployed in harsh environment, due to harsh limitations on the nodes’ hardware
and power resources. There are also challenges in time sensitive applications for providing a
reliable data delivery, such as unique network topology, diverse applications, small message size,
resource constraints, frequent node failure, and congestion. The main objective of this thesis is to
improve reliable data transport protocol for wireless sensor network. In order to achieve data
reliability of packet by detecting and recovering lost packet, by making survey on existing reliable
data transport protocols, approaches and identified Reliable Multi-Segment Transport Protocol
(RMST) an optimal protocol for reliability and make a survey on queue theory. The novel approach
is to develop hybrid Explicit Acknowledgments(EACK) and Negative Acknowledgments
(NACK) based loss detection and recovery mechanism to grant reliability and introduce a novel
queue management approach to avoid congestion in multi hop communication. Finally, new
approach was tested, and evaluated with different metrics on Tinyos 2.1.x, with Five, Ten Micaz
mote, meyer-heavy.txt full noisy file, in 50, 100 ms, and TOSSIM simulator on system application.
In addition to system application, developed health care application in order to monitoring of patients
biological states specifically on ECG and can generate early warnings if received signals turn from
predefined personalized ranges. From the analysis result, the Energy Efficient Reliable MultiSegment Transport Protocol (EERMST) end-to-end delay is 0:0: 0.00248333625 ms and NACK
based RMST is 0:0: 0.0057716035 ms. The delivery ratio of ACK is somewhat closer with
EERMST but has more packet delay. Generally, the EERMST has less end-to-ends delay and link
delay than RMST protocol.
