海韵讲座
时间地点：5月26日下午三点，海韵园行政楼C座505
第20期：Efficient Quality-of-Service Provisioning and Resource Allocation in Hybrid Wireless Networks
Speaker: Xiaojiang Du
Abstract – Wireless networking and communication technology has been widely usedin many areas, and is expected to grow rapidly in the next few years.At the same time, increasing proliferation of personal wirelessgadgets (such as laptops, Tablets, and smart phones) continuously opensup new services and possibilities for users. In the past severalyears, much research has been done on various wireless networks, suchas mobile ad hoc networks (MANETs), sensor networks, cellularnetworks, Wireless LANs (WLANs), vehicular ad hocnetworks and cognitive radio networks. In our research, weconsidereda promising wireless network – Hybrid Wireless Networks (HWNs). An HWNconsists of an infrastructure network (e.g., a cellular network) and afew ad hoc components (e.g., MANETs). By forming an HWN, one canachieve the benefits of both infrastructure wireless networks, such asgood reliability and Quality-of-Service (QoS) support, and ad hocnetworks, e.g., larger coverage, low deployment cost, and flexibility.
However, not much work has systematically studied network design andperformance of HWNs. In our research, we adopted the OFDMA (orthogonalfrequency division multiple access) based cellular networks (such as LTE and WiMAX) as the infrastructure network. We studyefficient QoS routing and OFDMA resource allocation in HWNs via asystematic, cross-layer approach. The objective is to satisfyindividual user’s QoS requirements while optimizing the overall systemperformance (e.g., throughput).
Both QoS support in traditional wireless networks and OFDMA resourceallocation in cellular networks have been well studied. However, inHWNs, QoS routing and OFDMA resource allocation are highly correlatedand this problem remains largely unexplored. In our research, wepropose jointly modeling and solving the QoS routing and OFDMAresource allocation issue in HWNs. The joint problem is NP-complete.We design efficient heuristic solutions to solve the problem. Oursimulation results showed that the heuristic solutions achievevery good performance.
Date & Time: May 26th, 3pm
Venue: C505
Bio – Dr. Xiaojiang Du is a tenured professor in the Department of Computer and Information Sciences at Temple University, Philadelphia, USA. Dr. Du received his B.S. and M.S. degree in electrical engineering from Tsinghua University, Beijing, China in 1996 and 1998, respectively. He received his M.S. and Ph.D. degree in electrical engineering from the University of Maryland College Park in 2002 and 2003, respectively. His research interests are wireless networks, computer networks, security, cloud computing, and systems. He has published over 130 journal and conference papers in these areas. Dr. Du has been awarded more than 3 million US dollars research grants from the US National Science Foundation (NSF), Army Research Office, Air Force, NASA, the State of Pennsylvania, and Amazon. He serves on the editorial boards of four international journals. Dr. Du will serve as the lead Chair of the Communication and Information Security Symposium of the IEEE International Communication Conference (ICC) 2015, and a Co-Chair of Mobile and WirelessNetworks Track of IEEE Wireless Communications and Networking Conference (WCNC) 2015. He is (was) a Technical Program Committee (TPC) member of several premier ACM/IEEE conferences such as INFOCOM (2007 – 2015), IM, NOMS, ICC, GLOBECOM, WCNC, BroadNet, and IPCCC. Dr. Du is a Senior Member of IEEE and a Life Member of ACM.