Talk 1：

Abstract：
Through dynamic access to the radio spectrum, cognitive radios (CRs) promise to provide reliable and
programmable wireless communications whenever and wherever needed. Although the development of
CRs is still in its infancy, the technology has already attracted a lot of attention from government
agencies and private corporations, which have been pushing for accelerating the research pace in this
area. To harvest the benefits of CRs, which include improved spectrum efficiency, spatial throughput,
connectivity, network availability, etc., our wireless and networking group has been investigating resource management and protocol design issues in CR networks (CRNs). In this talk, I will provide an overview of our research activities in this domain, focusing on the design of channel access and routing protocols for CRNs. I will also discuss various optimization frameworks for resource allocation (i.e., spectrum/power/rate assignment) for such networks, and will briefly comment on joint cademia/industry efforts to build a network of small-factor, spectrum-agile radios for military and civilian applications.

Biography:

Marwan Krunz: is a professor of electrical and computer engineering at the University of Arizona. He
directs the wireless and networking group in the ECE Department. He is also the UA site director for
Connection One, a joint NSF/state/industry IUCRC cooperative center that focuses on RF and wireless
communication systems and networks. At present, the center consists of five participating universities
and 17+ industrial affiliates. Dr. Krunz received his Ph.D. degree in electrical engineering from Michigan State University in 1995. He joined the University of Arizona in January 1997, after a brief postdoctoral stint at the University of Maryland, College Park. He previously held visiting research positions at INRIA, HP Labs, University of Paris VI, and US West (now Qwest) Advanced Technologies. His research interests lie in the fields of computer networking and wireless communications. His current research is focused on cognitive radios and SDRs; distributed radio resource management in wireless networks; channel access and protocol design; MIMO and smart-antenna systems; UWB-based personal area networks; energy management and clustering in sensor networks; media streaming; QoS routing; and fault monitoring/detection in optical networks. He has published more than 150 journal articles and refereed conference papers, and is a co-inventor on US patents. M. Krunz is a recipient of the National Science Foundation CAREER Award (1998). He currently serves on the editorial boards for the IEEE Transactions on Mobile Computing and the Computer Communications Journal. He previously served on the editorial board for the IEEE/ACM Transactions on Networking (2001-2008). He was a guest co-editor for special issues in IEEE Micro and IEEE Communications magazines. He served as a technical program chair for various international conferences, including the IEEE WoWMoM 2006, the IEEE SECON 2005, the IEEE INFOCOM 2004, and the 9th Hot Interconnects Symposium (2001). He has served and continues to serve on the executive and technical program committees of many international conferences and on the panels of several NSF directorates. He gave keynotes and tutorials, and participated in various panels at premier wireless networking conferences. He is a consultant for a number of companies in the telecommunications sector.

Talk 2：

Abstract：
Voice over IP (VoIP) is gaining momentum in the internet due to popularity of applications such as
Skype. The prospect of saving money for phone calls and the ease of usability and deployment are
key success factors. Recently, wireless VoIP gained significant interest due to the availability of
WLAN access at public hotspots, at home or within companies. Also, novel wireless devices will
allow switching between 3G and WLAN connectivity, depending on availability and cost factors.
However, penetration and coverage of WLAN is still low when compared to 3G which makes
ubiquitous usability not feasible. Wireless Meshed Networks (such as those proposed by upcoming
802.11s standard) are a significant step ahead of traditional WLANs as access points will be enabled
to communicate directly with each other through a wireless link. This creates the opportunity to
provide ubiquitous WLAN (meshed) coverage at very low cost. Surprisingly, the VoIP capacity of
current single radio WLAN meshed networks is severely limited due to e.g. the multihop forwarding
within the mesh. In this talk, we will give an introduction into the hot topic of wireless meshed
networks and provide important insights into different mechanisms on how capacity for VoIP can be
improved in 802.11 based Wireless Meshed Networks. Topics will include Packet Aggregation,
Channel Assignement and Channel Scheduling for Multi-Radio Multi-Channel WLAN Meshes. We
will also briefly introduce KAUMesh, our experimental multi-radio Mesh Network which can be used
for remote experiments. We will conclude the talk with an outlook into topics such as Cognitive
Meshed Networks.

Biography:

Andreas J. Kassler is currently Full Professor in Computer Science (Telematics and Multimedia
Communications) at Karlstad University, Sweden. He teaches Wireless communication and
multimedia networking related topics. He received his PhD in Computer Science from University of
Ulm, Germany, in 2002. At University of Ulm, he was the leader of the QoS and Mobility research
group at the Distributed Systems Department from 1998 until November 2003. In December 2003,
he joined the School of Computer Engineering, Nanyang Technological University (NTU), Singapore,
as an Assistant Professor. Since 2005 he has been with department of Computer Science at
Karlstad University in Sweden, where he held a position as Associate Professor from 2005 until
spring 2007. Dr. Kassler is a member of the IEEE, IEEE Communications Society, IEEE Computer
Society, and of the Technical Committee of Telecommunications of the IASTED. He is also member
of the ESF-MINEMA (Middleware for Network Eccentric and Mobile Applications) committee,
management committee member of the COST-TMA action (Traffic Monitoring and Analysis ) and a
member of ERCIM eMobility WG.