Priority-based Rate Adaptation Using Game Theory for Vehicular Networks

MPhil Thesis Defence


Title: "Priority-based Rate Adaptation Using Game Theory for Vehicular Networks"

By

Mr. Jiancheng Ye


Abstract

IEEE 802.11 Wireless Local Area Networks (WLANs) are becoming more and 
more popular in our daily lives. Since the 802.11 standards provide 
multiple data rates for transmission but do not specify algorithms for 
automatic rate selection, rate adaptation has been extensively used to 
maximize system throughput by adjusting transmission rates dynamically 
based on channel conditions. To the best of our knowledge, existing rate 
adaptation schemes mainly make use of packet statistics or signal 
strengths of received packets to adapt transmission rates, regardless of 
the priorities of packets.

In this thesis, we first find out that it is beneficial for rate 
adaptation schemes to consider the priorities of packets when adapting 
transmission rates. We then propose a novel priority-based rate adaptation 
scheme named SRAG (Stackelberg Rate Adaptation Game) which jointly 
considers channel conditions and priorities of packets using game theory. 
SRAG focuses on vehicular networks where we can easily find a variety of 
applications with different priorities, such as file downloading, VoIP 
(Voice over IP), traffic querying, collision warning, etc. In SRAG, rate 
adaptation is modeled as a game for different priorities of users and each 
user tries to select an optimal transmission rate that maximizes its 
utility regardless of others’ utilities. SRAG adopts a Stackelberg game 
model to regulate behaviors of self-interested users and gives priority to 
high priority users in order to achieve better overall performance. 
Extensive ns-2 simulations demonstrate that SRAG can provide much better 
performance for high priority users than existing rate adaptation schemes, 
while maintaining good performance for low priority users.


Date:			Thursday, 23 June 2011

Time:			3:00pm – 5:00pm

Venue:			Room 4483
 			Lifts 25/26

Committee Members:	Prof. Mounir Hamdi (Supervisor)
 			Dr. Jogesh Muppala (Chairperson)
 			Dr. Lin Gu


**** ALL are Welcome ****