Channel Assignment and Its Applications in Wireless Networks

PhD Thesis Proposal Defence


Title: "Channel Assignment and Its Applications in Wireless Networks"

by

Miss Yanyan Yang


Abstract:

Every different kind of wireless network has its own features, which put 
extra constraints on the channel assignment. As the emerging technology, 
wireless sensor networks (WSNs) are well known for its feature of easy 
deployment, low cost and etc. Since most of the commercial WSNs-oriented 
products using ISM 2.4GHz band for communications, the communication costs 
in terms of energy and time become a very challenging issue for real 
applications. By comprehensively studying the channel availabilities in 
WSNs, we propose Double-Plate, a fair channel assignment algorithm, which 
aims to ensure high throughput and fairness simultaneously. We prove that 
the achieved data sending rate is no less than 4/9 of the optimal rate in 
theory. With the observation of inefficient channel usages among the full 
spectrum band, the new concept of cognitive radio networks (CRNs) is 
proposed by researchers. To detect the signal boundary of each primary 
user, we initiate a cooperative boundary detection algorithm which 
utilizes WSNs. We then also formulate a Sensing Effectiveness Maximization 
Problem (SEMP) to deal with the cases when multiple primary users exist. 
We prove that SEMP is NP-complete, and then propose a Sensing Channel 
Assignment algorithm (SCAS) aiming to sense more channels to improve the 
sensing effectiveness. Results show that the improvement is up to 300% 
compared with other simple alternatives.


Date:  			Wednesday, 3 February 2010

Time:                   10:30am - 12:30pm

Venue:                  Room 3301
 			lifts 17/18

Committee Members:      Prof. Lionel Ni (Supervisor)
 			Dr. Lei Chen (Chairperson)
 			Dr. Lin Gu
 			Dr. Qian Zhang


**** ALL are Welcome ****