Events,News

WiSense Seminar #113, “Impact of Variable CCA Periods on the Efficiency of IEEE 802.15.4 MAC Protocol”, M.Guennoun

Title: WiSense Seminar #113, “Impact of Variable CCA Periods on the Efficiency of IEEE 802.15.4 MAC Protocol”

Speaker: Mouhcine Guennoun

Description: Towards designing a new efficient Medium Access Control (MAC) protocol that overcomes the shortcomings of the 802.15.4 standard MAC, we propose to exploit the Clear Channel Assessment (CCA) feature in a more efficient fashion. In this presentation we study the impact of increasing the number of CCAs performed by a node beyond the standard value of 2. We develop a mathematical model that describes the functionality of the outcome MAC protocol. We derive the theoretical expressions of the probability of collision, throughput, channel idle time, channel collision time, energy consumption, delay, and reliability. We validate the model using an in house built WSN simulator. We then propose the Semi-Persistent MAC (SP-MAC) protocol that combines the advantages of the 802.11 and 802.15.4 Carrier Sense Medium Access.

Bio Notes: Mouhcine Guennoun is a Ph.D. student at the School of Electrical Engineering and Computer Science, University of Ottawa. His research interests include WSN MAC performance optimization, wireless security, and intrusion detection in Ad-Hoc wireless networks.

Start Time: 10:00
Date: 2014-03-13
End Time: 12:00

Events

WiSense Seiminar #112, Routing in Ad Hoc Cognitive Radio Networks: Challenges and Solutions, Mahmoud M.Gad

Title: Routing in Ad Hoc Cognitive Radio Networks: Challenges and Solutions

Presenter: Mahmoud M. Gad

Abstract: 

Spectrum utilization in wireless communications is currently governed by licensing regulations where each user is assigned a fixed frequency-band for transmission. Because of the rising demand for wireless applications, cognitive radio technology has gained a remarkable consideration. In cognitive radio networks, the unlicensed users can opportunistically utilize the licensed user’s spectrum when it is vacant and must evacuate the spectrum once the PU is active again. This approach can virtually increase the available bandwidth for wireless networks. Cognitive Radio Networks, however, impose unique challenges due to the high fluctuation in the available spectrum as well as the diverse quality of service (QoS)

requirements. One of the main challenges is the establishment and the maintenance of routes in multi-hop CRNs. In this seminar the connectivity problem in cognitive radio networks will be discussed. A novel connectivity metric for multi-hop CRNs will be presented. The performance of a new location-based routing algorithm for large scale CRNs will be discussed. Finally, applications of CRNs in real life scenarios will be presented.

 

Bio Notes:

Mahmoud Gad received his B.Sc. in Electrical Engineering from the University of Alexandria (2003), and his M.Sc. in Electrical and Computer Engineering from the University of Maryland, College Park (2008). Currently, he is a PhD Candidate, under the supervision of Professor Hussein Mouftah, at the School of Electrical Engineering and Computer Science (EECS) of the University of Ottawa. His research interests include security in cellular networks, stability analysis of large scale networks, and software defined networks. His current research interests focus on Network Connectivity in Cognitive Radio ad-hoc Networks, Large Scale Sensor Networks, and Routing for Cognitive Radio Networks.

ontario

WiSense is supported by a grant from the Government of Ontario. Click HERE to visit the website of the Ministry of Economic Development and Innovation.

uoo

University of Ottawa is the Lead Institution managing the WiSense Project