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Inset Picture: Participants listening to the presentation made by Mr. Yong Yueh Tiam

30th January 2013 - FCSIT has organized a Seminar Series entitled Efficient MAC Algorithm for Wireless Sensor Network in Rural Applications by Mr. Yong Yueh Tiam today at FCSIT Main Meeting Room. The session starts at 2pm which attracts academicians, researcher, & postgraduate students from the Faculty.

Below are the abstracts to his presentation. 

A Wireless Sensor Network (WSN) comprises spatially distributed autonomous sensors that monitor physical or environmental conditions such as temperature, sound, vibration, pressure, motion, or pollutants [1][2] and pass for further processing the collected data. Sensor networks are bi-directional, enabling control of sensor activities. The importance of WSN is due to its important applications such as area monitoring, industrial monitoring and environmental sensing.

In rural area, the each transmission station are quite far away from each other. Therefore the expansion of transmission and carrier sensing range in individual node is needed especially for rural area to reduce the number of transmission station and reduce cost of the construction as well. However, the expansion brings up the issue of Multiple-link interference and this increases the possibility of overhearing issue. Therefore, the idea of fairness for all transmission stations to use the medium access becomes an important problem in wireless network. Each transmission station has their own schedule to have medium for transmission or receiving data in order to increase the fairness of each other. Meanwhile, data will be easily corrupted in long distance if the collision of data happens at area of overlapped transmission range from transmission stations.

This situation definitely decreases the throughput of transmission. By resending the beacon or preamble for acknowledgement, the sender will resend the data to sender to complete the data transmission. However, the couples of times for resending the data perform inefficient link-level recovery. Thus, the delay in transmission is increase and decreases the energy efficiency as well. Again, to increase transmission and carrier sensing range, the power consumption of each node become higher that before and the latency of transmission is increased since the distance between each node become farther. Hence, the optimized schedule for each node is needed to achieve better performance of throughput, delay and energy consumption in wireless communication.

Since the nature resources and power resources are limited nowadays, the number of transmission station construction is constrained. However, the key problems for high transmission range are low utilization, collisions at long distances, and inter-link interference. Current expended transmission range MAC protocol such as a WiLD-MAC which use the bulk packet acknowledgments to address the problem of low utilization. But the performance of throughput and delay are constant with different distance point-to-point links. 

At the end of the research, a new algorithm will be produced to help in evaluating node participation in wireless communication network with different kinds of transmission and carrier sensing range and distance between nodes. A simulated cooperative wireless communication network will be setup so that it could be used for simulating any of the future cases which related to cooperative wireless communication network. Two research papers are to be published, allowing international reviews on the proposed approach. 

The session ends at 3.30pm.

To view the pictures during this demo session, please click here.