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Förslaget inkom 2011-07-12

Medium Access Control for Wireless Sensor Actuator Networks

OBS! ANSÖKNINGSTIDEN FÖR DETTA EXJOBB HAR LÖPT UT.
BACKGROUND:
In a wireless network, the medium is a shared resource. The nodes in the network negotiate access of
the shared resource using the Medium Access Control (MAC) protocol. There is much interplay
between the design of a MAC protocol for a sensor node and the wireless transceiver. Often, the
transceiver characteristics limit the design of medium access methods, and most protocols settle for
simple methods such as time division multiple access (TDMA) or carrier sense multiple access /
collision avoidance (CSMA/CA).
Typically industrial applications where wireless sensor actuator networks (WSANs) are used is control
and monitoring applications that run over the wireless network. To control an unstable process,
message deliveries over the network must be time-bounded; the network must offer reliabilities and
delays comparable to a point-to-point network. This is a major challenge today and this thesis aims to
investigate the problem further.

PROBLEM STATEMENT:
The questions in this work are, in order of priority (all are not necessarily addressed):
- Improvements of current MAC- layer
- Investigation of different network topology (star, mesh, star-mesh networks)
- Complexity issues
- Power efficiency

TASKS AND TOOLS
The thesis work should comprise the following tasks:
- Theoretical study of the approaches, the industry-specific constraints and standards
- Preliminary evaluation through simulation and computations (Matlab or similar)
- Performance evaluation in terms of latency, packet error rate, complexity etc.
- Final report describing the work and results

REQUIREMENTS
Students in MSc programs in Electrical Engineering, Engineering Physics, Control Engineering, and
Computer Engineering or similar is suited for this job. Candidates are expected to have a strong
background in communication theory and computer science. Good mathematical and programming
skills are desired. It is also important that the applicant have good writing and communication skills.
Please indicate a list of courses with marks and a CV in your application.

CONTACT PERSON
Mikael Gidlund,
mikael.gidlund@se.abb.com

STARTING DATE
Sept/Oct 2011

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