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1.
In mobile computing environments, vital resources like battery power and wireless channel bandwidth impose significant challenges in ubiquitous information access. In this paper, we propose a novel energy and bandwidth efficient data caching mechanism, called GreedyDual Least Utility (GD-LU), that enhances dynamic data availability while maintaining consistency. The proposed utility-based caching mechanism considers several characteristics of mobile distributed systems, such as connection-disconnection, mobility handoff, data update and user request patterns to achieve significant energy savings in mobile devices. We develop an analytical model for energy consumption of mobile devices in a dynamic data environment. Based on the utility function derived from the analytical model, we propose algorithms for cache replacement and passive prefetching of data objects. Our comprehensive simulation experiments demonstrate that the proposed caching mechanism achieves more than 10% energy saving and near-optimal performance tradeoff between access latency and energy consumption.
Huaping Shen received his M.S. and B.S. degrees in computer science from Fudan University, China, in 2001 and 1998, respectively. He is currently a Ph.D. student in the Department of Computer Science and Engineering at the University of Texas at Arlington. His research interests include data management in mobile networks, mobile computing, peer-to-peer networks, and pervasive computing.
Mohan Kumar is an Associate Professor in Computer Science and Engineering at the University of Texas at Arlington. His current research interests are in pervasive computing, wireless networks and mobility, active networks, mobile agents, and distributed computing. Recently, he has developed or co-developed algorithms for active-network based routing and multicasting in wireless networks and caching prefetching in mobile distributed computing. He has published over 90 articles in refereed journals and conference proceedings and supervised Masters and doctoral theses in the areas of pervasive computing, caching/prefetching, active networks, wireless networks and mobility, and scheduling in distributed systems. Kumar is on the editorial board of The Computer Journal and he has guest edited special issues of several leading international journals including MONET and WINET issues and the IEEE Transactions on Computers. He is a co-founder of the IEEE International Conference on pervasive computing and communications (PerCom)—served as the program chair for PerCom 2003, and is the vice general chair for PerCom 2004. He has also served in the technical program committees of numerous international conferences/workshops. He is a senior member of the IEEE. Mohan Kumar obtained his PhD (1992) and MTech (1985) degrees from the Indian Institute of Science and the BE (1982) from Bangalore University in India. Prior to joining The University of Texas at Arlington in 2001, he held faculty positions at the Curtin University of Technology, Perth, Australia (1992–2000), The Indian Institute of Science (1986-1992), and Bangalore University (1985–1986).
Dr. Sajal K. Das is currently a Professor of Computer Science and Engineering and also the Founding Director of the Center for Research in Wireless Mobility and Networking (CReWMaN) at the University of Texas at Arlington (UTA). Prior to 1999, he was a professor of Computer Science at the University of North Texas (UNT), Denton where he founded the Center for Research in Wireless Computing (CReW) in 1997, and also served as the Director of the Center for Research in Parallel and Distributed Computing (CRPDC) during 1995–97. Dr. Das is a recipient of the UNT Student Association’s Honor Professor Award in 1991 and 1997 for best teaching and scholarly research; UNT’s Developing Scholars Award in 1996 for outstanding research; UTA’s Outstanding Faculty Research Award in Computer Science in 2001 and 2003; and the UTA College of Engineering Research Excellence Award in 2003. An internationally-known computer scientist, he has visited numerous universities, research organizations, government and industry labs worldwide for collaborative research and invited seminar talks. He is also frequently invited as a keynote speaker at international conferences and symposia.Dr. Das’ current research interests include resource and mobility management in wireless networks, mobile and pervasive computing, wireless multimedia and QoS provisioning, sensor networks, mobile internet architectures and protocols, parallel processing, grid computing, performance modeling and simulation. He has published over 250 research papers in these areas, directed numerous industry and government funded projects, and holds four US patents in wireless mobile networks. He received the Best Paper Awards in the 5th Annual ACM International Conference on Mobile Computing and Networking (MobiCom’99), 16th International Conference on Information Networking (ICOIN-16), 3rd ACM International Workshop on Modeling, Analysis and Simulation of Wireless and Mobile Systems (MSWiM 2000), and 11th ACM/IEEE International Workshop on Parallel and Distributed Simulation (PADS’97). Dr. Das serves on the Editorial Boards of IEEE Transactions on Mobile Computing, ACM/Kluwer Wireless Networks, Parallel Processing Letters, Journal of Parallel Algorithms and Applications. He served as General Chair of IEEE PerCom 2004, MASCOTS’02 ACM WoWMoM 2000-02; General Vice Chair of IEEE PerCom 2003, ACM MobiCom-2000 and IEEE HiPC 2000-01; Program Chair of IWDC 2002, WoWMoM 1998-99; TPC Vice Chair of ICPADS 2002; and as TPC member of numerous IEEE and ACM conferences. He is Vice Chair of the IEEE TCPP and TCCC Executive Committees and on the Advisory Boards of several cutting-edge companies.Dr. Sajal K. Das received B.S. degree in 1983 from Calcutta University, M.S. degree in 1984 from Indian Institute of Science, Bangalore, and Ph.D. degree in 1988 from the University of Central Florida, Orlando, all in Computer Science.
Zhijun Wang received the M.S degree in Electrical Engineering from Pennsylvania State University, University Park, PA, 2001. He is working toward the Ph.D. degree in Computer Science and Engineering Department at the University of Texas at Arlington. His current research interests include data management in mobile networks and peer-to-peer networks, mobile computing and networking processors.This revised version was published online in August 2005 with a corrected cover date. 相似文献
2.
Optimal power control is of great importance for CDMA systems and it can be controlled to provide the desired quality of service
(QoS) to mobile hosts in a cellular radio system. The power levels of all the mobile hosts are determined and constantly tuned
in order to achieve the required SINR (signal to interference and noise ratio) which changes dynamically. The SINR of all
the K mobiles in a cell can be expressed in the form of a k-dimensional vector. It helps determine the operating point of the system and hence it is constantly monitored and updated
due to the variability in the wireless channel conditions and user mobility. We view this continuously changing vector as
the motion of a point in a higher dimensional Euclidean space, called the QoS space. We apply vector quantization technique to shrink the infinite-point space to a finite-point space by partitioning the former
into N regions such that the points within a region reflect almost similar system performance and are identified by what we call
a QoS index. We show how the system operating point can be mapped to one of the QoS indices. The location of the point or the region
of operability in the QoS space conveys the system status in terms of the current load and the QoS being delivered. The dynamism
in the system's input conditions due to wireless link characteristics and user mobility acts like an opposing force against
which the system has to operate. The system reacts to all such changes preventing it from going into a region with an undesirable
QoS index. We show how the apriori knowledge of the operating region helps in decision making pertaining to call admission
and resource allocation in CDMA systems.
Mainak Chatterjee received his Ph.D. from the department of Computer Science and Engineering at the University of Texas at Arlington in 2002.
Prior to that, he completed his B.Sc. with Physics (Hons) from the University of Calcutta in 1994 and M.E. in Electrical Communication
Engineering from the Indian Institute of Science, Bangalore. He is currently an Assistant Professor in the department of Electrical
and Computer Engineering at the University of Central Florida. His research interests include resource management and quality-of-service
provisioning in wireless and cellular networks, sensor networks, CDMA data networking, media access control protocols, Internet
traffic, and applied game theory.
Sajal K. Das is a Professor of Computer Science and Engineering and also the Founding Director of the Center for Research in Wireless
Mobility and Networking (CReWMaN) at the University of Texas at Arlington (UTA). His current research interests include resource
and mobility management in wireless networks, mobile and pervasive computing, wireless multimedia and QoS provisioning, sensor
networks, mobile Internet protocols, distributed processing and grid computing. He has published over 250 research papers,
directed numerous funded projects, and holds 5 US patents in wireless mobile networks. He received the Best Paper Awards in
ACM MobiCom'99, ICOIN-2001, ACM MSWIM-2000, and ACM/IEEE PADS'97. Dr. Das is also a recipeint of UTA's Outstanding Faculty
Research Award in Computer Science in 2001 and 2003, and UTA's College of Engineering Excellence in Research Award in 2003.
He serves on the Editorial Boards of IEEE Transactions on Mobile Computing, ACM/Kluwer Wireless Networks, Parallel Processing
Letters, Journal of Parallel Algorithms and Applications. He served as General Chair of IEEE PerCom-2004, CIT-2003 and IEEE
MASCOTS-2002; General Vice Chair of IEEE PerCom-2003, ACM MobiCom-2000 and HiPC 2000-01; General Chair of ACM WoWMoM 2000-02;
Program Chair of IWDC-2002, WoWMoM 1998-99; TPC Vice Chair of ICPADS-2002; and as TPC member of numerous IEEE and ACM conferences.
He is the Vice Chair of IEEE TCPP and TCCC. Prior to 1999, Dr. Das was a professor of computer science at Univeristy of North
Texas where he twice (1991 and 1997) received the Student Association's Honor Professor Award for best teaching and scholarly
research. He received B.Tech. degree in 1983 from Calcutta University, M.S. degree in 1984 from Indian Institute of Science,
Bangalore, and PhD degree in 1988 from the University of Central Florida, Orlando, all in Computer Science. 相似文献
3.
The wireless data services are getting more and more competitive because of the presence of multiple service providers, all
of whom offer some relative advantages and flexibilities over the others. As a result, the user churn behavior (i.e., migration
from one service provider to another) is causing tremendous revenue loss for the service providers and also failure of existing
resource management algorithms to fully capture the impact of churning. Moreover, the quality of service (QoS) offered to
users belonging to different classes calls for new resource management schemes that address the issues related to differentiated
services.
In this paper, we propose a framework to study the impact of user churn behavior on the resource management algorithms to
provide class-based differentiated services in CDMA data networks. In particular, our framework incorporates the user churning
behavior into the admission control and power management algorithms, so that the service provider’s revenue loss due to churn
can be minimized. Since optimal rate/power allocation in multi-rate CDMA systems is in general NP-Complete, we provide heuristics
that try to provide solutions to the resource allocation problem in real-time. In our proposed framework, we add another layer
of power management called Class-Based Power Allocation/Reduction (CBPAR) function, which works with the rate control algorithm
to achieve power allocation. With CBPAR, the number of variables of the optimization problem is significantly reduced helping
achieve the results in real-time. Our simulation study shows that the service provider’s revenue can be improved with the
help of CBPAR framework. It also reveals the relationship between users’ sensitivity and tolerance to QoS degradation and
optimal power allocations.
Haitao Lin received his PhD in Computer Science and Engineering from the University of Texas at Arlington in 2004. He received his B.E.
degree in Radio Engineering from Southeast University, Nanjing, China, in 1996 and the MS degree in Computer Applications
from the Beijing University of Posts and Telecommunications, Beijing, China, in 2000. He is currently with Converged Multimedia
Networks (CMN) Systems Engineering at Nortel, Richardson, Texas. His research interests include wireless network performance
evaluation and enhancement, wireless link adaptation, wireless network resource management, applied game theory, network overload
control performance modeling and analysis.
Mainak Chatterjee received his Ph.D. from the department of Computer Science and Engineering at The University of Texas at Arlington in 2002.
Prior to that, he completed his B.Sc. with Physics (Hons) from the University of Calcutta in 1994 and M.E. in Electrical Communication
Engineering from the Indian Institute of Science, Bangalore, in 1998. He is currently an Assistant Professor in the department
of Electrical and Computer Engineering at the University of Central Florida. His research interests include economic issues
in wireless networks, applied game theory, resource management and quality-of-service provisioning, ad hoc and sensor networks,
CDMA data networking, and link layer protocols. He serves on the executive and technical program committee of several international
conferences.
Sajal K. Das received the BTech degree in 1983 from Calcutta University, the MS degree in 1984 from the Indian Institute of Science, Bangalore,
and the PhD degree in 1988 from the University of Central Florida, Orlando, all in computer science. Prior to 1999, he was
a professor of computer science at the University of North Texas, where he twice (in 1991 and 1997) received the Student Associationís
Honor Professor Award for best teaching and scholarly research. Currently, he is a professor of computer science and engineering
and also the founding director of the Center for Research in Wireless Mobility and Networking (CReWMaN) at the University
of Texas at Arlington (UTA). His current research interests include resource and mobility management in wireless and sensor
networks, mobile and pervasive computing, wireless multimedia and QoS provisioning, mobile Internet protocols, distributed
processing, and grid computing. He has published more than 350 research papers, directed numerous funded projects, and holds
five US patents in wireless mobile networks. He received the Best Paper Award in ACM MobiComí99, ICOINí01, ACM MSWIMí00, and
ACM/IEEE PADSí97. He was also a recipient of UTAís Outstanding Faculty Research Award in Computer Science in 2001 and 2003,
and UTAís College of Engineering Excellence in Research Award in 2003. He is the coauthor of a book Smart Environments: Technology,
Protocols and Applications, published in 2004 by John Wiley. Dr. Das is the editor-in-chief of the Pervasive and Mobile Computing
journal and serves on the editorial Boards of four international journals, including IEEE Transactions on Mobile Computing
and ACM/Kluwer Wireless Networks. He has served as general chair of IEEE WoWMoMí05, IWDCí04, IEEE PerComí04, CITí03, and IEEE
MASCOTSí02; general vice chair of IEEE PerComí03, ACM Mobi- Comí00, and HiPCí00-01; program chair of IWDCí02 and WoWMoMí98-99;
TPC vice chair of CITí05 and ICPADSí02; and as TPC member of numerous IEEE and ACM conferences. He is the vice chair of IEEE
Technical Committees (TCPP and TCCC) and on the Advisory Boards of several cutting-edge companies. He is a member of the IEEE
Computer Society. 相似文献
4.
This paper describes research towards a system for locating wireless nodes in a home environment requiring merely a single
access point. The only sensor reading used for the location estimation is the received signal strength indication (RSSI) as
given by an RF interface, e.g., Wi-Fi. Wireless signal strength maps for the positioning filter are obtained by a two-step
parametric and measurement driven ray-tracing approach to account for absorption and reflection characteristics of various
obstacles. Location estimates are then computed using Bayesian filtering on sample sets derived by Monte Carlo sampling. We
outline the research leading to the system and provide location performance metrics using trace-driven simulations and real-life
experiments. Our results and real-life walk-troughs indicate that RSSI readings from a single access point in an indoor environment are sufficient to derive good location estimates of users with sub-room precision.
Gergely V. Záruba is an Assistant Professor of Computer Science and Engineering at The University of Texas at Arlington (CSE@UTA). He has received
the Ph.D. degree in Computer Science from The University of Texas at Dallas in 2001, and the M.S. degree in Computer Engineering
from the Technical University of Budapest, Department of Telecommunications and Telematics, in 1997. Dr. Záruba’s research
interests include wireless networks, algorithms, and protocols, performance evaluation, current wireless and assistive technologies.
He has served on many organizing and technical program committees for leading conferences and has guest edited journals. He
is a member of the IEEE and its Communications Society.
Manfred Huber is an Assistant Professor of Computer Science and Engineering at The University of Texas at Arlington (CSE@UTA). He received
his M.S. and Ph.D. degrees in Computer Science from the University of Massachusetts, Amherst in 1993 and 2000, respectively.
He obtained his “Vordiplom” from the University of Karlsruhe, Germany in 1990. Dr. Huber is the co-director of the Robotics
and of the Learning and Planning Laboratory at CSE@UTA. His research interests are in reinforcement learning, autonomous robots,
cognitive systems, and adaptive human-computer interfaces. He is a member of the IEEE, the ACM, and the AAAI.
Farhad A. Kamangar is a Professor of Computer Science and Engineering at The University of Texas at Arlington (CSE@UTA). He has received the
Ph.D. and M.S. degrees in Electrical Engineering from The University of Texas at Arlington in 1980 and 1977 respectively.
He received his B.S. degree from the University of Teheran, Iran in 1975. Dr. Kamangar’s research interests include image
processing, robotics, signal processing, machine intelligence and computer graphics. He is a member of the IEEE and the ACM.
Imrich Chlamtac is the President of CREATE-NET and the Bruno Kessler Professor at the University of Trento, Italy and has held various honorary
and chaired professorships in USA and Europe including the Distinguished Chair in Telecommunications Professorship at the
University of Texas at Dallas, Sackler Professorship at Tel Aviv University and University Professorship at the Technical
University of Budapest. In the past he was with Technion and UMass, Amherst, DEC Research. Dr. Imrich Chlamtac has made significant
contribution to various networking technologies as scientist, educator and entrepreneur. Dr. Chlamtac is the recipient of
multiple awards and recognitions including Fellow of the IEEE, Fellow of the ACM, Fulbright Scholar, the ACM Award for Outstanding
Contributions to Research on Mobility and the IEEE Award for Outstanding Technical Contributions to Wireless Personal Communications.
Dr. Chlamtac published close to four hundred refereed journal, book, and conference articles and is listed among ISI’s Highly
Cited Researchers in Computer Science. Dr. Chlamtac is the co-author of four books, including the first book on Local Area
Networks (1980) and the Amazon.com best seller and IEEE Editor’s Choice Wireless and Mobile Network Architectures, published
by John Wiley and Sons (2000). Dr. Chlamtac has widely contributed to the scientific community as founder and Chair of ACM
Sigmobile, founder and steering committee chair of some of the lead conferences in networking, including ACM Mobicom, IEEE/SPIE/ACM
OptiComm, CreateNet Mobiquitous, CreateNet WiOpt, IEEE/CreateNet Broadnet, IEEE/CreateNet Tridentcom and IEEE/CreateNet Securecomm
conferences. Dr. Chlamtac also serves as the founding Editor in Chief of the ACM/URSI/Springer Wireless Networks (WINET),
the ACM/Springer Journal on Special Topics in Mobile Networks and Applications (MONET). 相似文献
5.
The deployment of infrastructure-less ad hoc networks is suffering from the lack of applications in spite of active research
over a decade. This problem can be solved to a certain extent by porting successful legacy Internet applications and protocols
to the ad hoc network domain. Session Initiation Protocol (SIP) is designed to provide the signaling support for multimedia
applications such as Internet telephony, Instant Messaging, Presence etc. SIP relies on the infrastructure of the Internet
and an overlay of centralized SIP servers to enable the SIP endpoints discover each other and establish a session by exchanging
SIP messages. However, such an infrastructure is unavailable in ad hoc networks. In this paper, we propose two approaches
to solve this problem and enable SIP-based session setup in ad hoc networks (i) a loosely coupled approach, where the SIP
endpoint discovery is decoupled from the routing procedure and (ii) a tightly coupled approach, which integrates the endpoint
discovery with a fully distributed cluster based routing protocol that builds a virtual topology for efficient routing. Simulation
experiments show that the tightly coupled approach performs better for (relatively) static multihop wireless networks than
the loosely coupled approach in terms of the latency in SIP session setup. The loosely coupled approach, on the other hand,
generally performs better in networks with random node mobility. The tightly coupled approach, however, has lower control
overhead in both the cases.
This work was partially done while the author was a graduate student in CReWMaN, University of Texas at Arlington.
Dr. Nilanjan Banerjee is a Senior Research Engineer in the Networks Research group at Motorola India Research Labs. He is currently working on
converged network systems. He received his Ph.D. and M.S. in computer science and engineering from University of Texas at
Arlington. He received his B.E. degree in the same discipline from Jadavpur University, India. His research interests include
telecom network architectures and protocols, identity management and network security, mobile and pervasive computing, measures
for performance, modeling and simulation, and optimization in dynamic systems.
Dr Arup Acharya is a Research Staff Member in the Internet Infrastructure and Computing Utilities group at IBM T.J. Watson Research Center
and leads the Advanced Networking micropractice in On-Demand Innovation Services. His current work includes SIP-based services
such as VoIP, Instant Messaging and Presence, and includes customer consulting engagements and providing subject matter expertise
in corporate strategy teams. Presently, he is leading a IBM Research project on scalability and performance of SIP servers
for large workloads. In addition, he also works on different topics in mobile/wireless networking such as mesh networks. He
has published extensively in conferences/journals and has been awarded seven patents. Before joining IBM in 2000, he was with
NEC C&C Research Laboratories, Princeton. He received a B.Tech degree in Computer Science from the Indian Institute of Technology,
Kharagpur and a PhD in Computer Science from Rutgers University in 1995. Further information is available at
Dr. Sajal K. Das is a Professor of Computer Science and Engineering and also the Founding Director of the Center for Research in Wireless
Mobility and Networking (CReWMaN) at the University of Texas at Arlington (UTA). His current research interests include sensor
networks, resource and mobility management in wireless networks, mobile and pervasive computing, wireless multimedia and QoS
provisioning, wireless internet architectures and protocols, grid computing, applied graph theory and game theory. He has
published over 400 research papers in these areas, holds four US patents in wireless internet and mobile networks. He received
Best Paper Awards in IEEE PerCom’06, ACM MobiCom’99, ICOIN’02, ACM MSwiM’00 and ACM/IEEE PADS’97. He is also recipient of
UTA’s Outstanding Faculty Research Award in Computer Science (2001 and 2003), College of Engineering Research Excellence Award
(2003), the University Award for Distinguished record of Research (2005), and UTA Academy of Distinguished Scholars Award
(2006). He serves as the Editor-in-Chief of Pervasive and Mobile Computing journal, and as Associate Editor of IEEE Transactions
on Mobile Computing, ACM/Springer Wireless Networks, IEEE Transactions on Parallel and Distributed Systems. He has served
as General or Program Chair and TPC member of numerous IEEE and ACM conferences. He is a member of IEEE TCCC and TCPP Executive
Committees. 相似文献
6.
2005 总被引:73,自引:0,他引:73
In recent years, wireless Internet service providers (WISPs) have established Wi-Fi hotspots in increasing numbers at public venues, providing local coverage to traveling users and empowering them with the ability to access email, Web, and other Internet applications on the move. In this paper, we observe that while the mobile computing landscape has changed both in terms of number and type of hotspot venues, there are several technological and deployment challenges remaining before hotspots can become an ubiquitous infrastructure. These challenges include authentication, security, coverage, management, location services, billing, and interoperability. We discuss existing research, the work of standards bodies, and the experience of commercial hotspot providers in these areas, and then describe compelling open research questions that remain.
Anand Balachandran has been a member of the research staff at Intel Research, Seattle since October 2003. His research interests include wireless networking systems, wireless Internet, infrastructure and ad-hoc networks, and mobile and ubiquitous computing. He received his Bachelor of Technology degree from the Indian Institute of Technology, Madras in 1995, his Master’s degree from Columbia University, in 1997, and his Ph.D. degree in Computer Science and Engineering from the University of California at San Diego in 2003.
Geoffrey M. Voelker is an assistant professor at the University of California at San Diego. His research interests include operating systems, distributed systems, networking, and mobile computing. He received a BS degree in Electrical Engineering and Computer Science from the University of California at Berkeley in 1992, and the M.S. and Ph.D. degrees in Computer Science and Engineering from the University of Washington in 1995 and 2000, respectively. In 2000, he received the first Computing Research Association (CRA) Digital Government Fellowship, and in 2002 he received the Hellman Young Faculty Fellowship at UCSD.
Victor Bahl is a Senior Researcher and the Manager of the Networking Group in Microsoft Research. His research interests span a variety of problems in wireless networking. In addition to making many product contributions, he has authored over 65 scientific papers, 44 issued and pending patent applications and several book chapters. He is the co-founder and Chairman of the ACM Special Interest Group in Mobility (SIGMOBILE); the founder and past Editor-in-Chief of ACM Mobile Computing and Communications Review, and the founder and Steering Committee Chair of ACM/USENIX Mobile Systems Conference (MobiSys); He has served on the editorial board of IEEE Journal on Selected Areas in Communications, and is currently serving on the editorial boards of Elsevier’s Adhoc Networking Journal, Kulwer’s Telecommunications Systems Journal, and ACM’s Wireless Networking Journal. He has served as a guest editor for several IEEE and ACM journals and on networking review panels organized by the National Science Foundation (NSF), the National Research Council (NRC) and European Union’s COST. He has served as the General Chairman, Program Chair and Steering Committee member of several IEEE and ACM conferences and on the Technical Program Committee of over 45 international conferences and workshops. He is the recipient of Digital’s Doctoral Engineering Award (1994) and ACM SIGMOBILE’s Distinguished Service Award (2001). He is a Fellow of the ACM, a Senior Member of the IEEE and a past president of the electrical engineering honor society Eta kappa Nu-Zeta Pi. Dr. Bahl received his Ph. D in Computer Systems Engineering from the University of Massachusetts Amherst.This revised version was published online in August 2005 with a corrected cover date. 相似文献
7.
With information access becoming more and more ubiquitous, there is a need for providing QoS support for communication that
spans wired and wireless networks. For the wired side, RSVP/SBM has been widely accepted as a flow reservation scheme in IEEE
802 style LANs. Thus, it would be desirable to investigate the integration of RSVP and a flow reservation scheme in wireless
LANs, as an end-to-end solution for QoS guarantee in wired-cum-wireless networks. For this purpose, we propose WRESV, a lightweight
RSVP-like flow reservation and admission control scheme for IEEE 802.11 wireless LANs. Using WRESV, wired/wireless integration
can be easily implemented by cross-layer interaction at the Access Point. Main components of the integration are RSVP-WRESV
parameter mapping and the initiation of new reservation messages, depending on where senders/receivers are located. In addition,
to support smooth roaming of mobile users among different basic service sets (BSS), we devise an efficient handoff scheme
that considers both the flow rate demand and network resource availability for continuous QoS support. Furthermore, various
optimizations for supporting multicast session and QoS re-negotiation are proposed for better performance improvement. Extensive
simulation results show that the proposed scheme is promising in enriching the QoS support of multimedia applications in heterogeneous
wired-cum-wireless networks.
Ming Li received his B.S. and M.S. in Engineering from Shanghai Jiao Tong University, China, in 1995 and 1998, respectively. He is
currently a Ph.D. candidate in department of Computer Science, University of Texas at Dallas, where he received M.S. degree
in Computer Science in Dec. 2001. His research interest includes QoSschemes for mobile ad-hoc networks and multimedia over
wireless networks.
Hua Zhu received the Ph.D. degree in Electrical Engineering from the University of Texas at Dallas, Texas. Since 2005, he has been
working for San Diego Research Center, Inc., San Diego, CA, as a Research Engineer. His research interests include all layers
of wireless communication systems. His particular interest is in L2/3 air interface design, performance analysis, and optimization
for ad hoc and sensor networks.
Imrich Chlamtac is the President of CREATE-NET and the Bruno Kessler Professor at the University of Trento, Italy. He has held various honorary
and chaired professorships in USA and Europe including the Distinguished Chair in Telecommunications Professorship at the
University of Texas at Dallas, Sackler Professroship at Tel Aviv University and has been on faculty at Technion, and UMass.
Dr. Imrich Chlamtac has made significant contribution to various networking technologies as scientist, educator and entrepreneur.
Dr. Chlamtac is the recipient of multiple awards and recognitions including Fellow of the IEEE, Fellow of the ACM, Fulbright
Scholar, the ACM Award for Outstanding Contributions to Research on Mobility and the IEEE Award for Outstanding Technical
Contributions to Wireless Personal Communications. Dr. Chlamtac published over three hundred and fifty refereed journal, book,
and conference articles and is the co-author of four books. Dr. Chlamtac has widely contributed to the scientific community
as founder and Chair of ACM Sigmobile, founder and steering committee chair of some of the lead conferences in networking
including Mobicom, OptiComm, Mobiquitous, Broadnets, Securecomm. Dr. Chlamtac also serves as the founding Editor in Chief
of the ACM/URSI/Springer Wireless Networks (WINET), the ACM/Springer Journal on Special Topics in Mobile Networks and Applications
(MONET).
B. Prahbakaran is with the faculty of Computer Science Department, University of Texas at Dallas. He has been working in the area of multimedia
systems: animation & multimedia databases, authoring & presentation, resource management, and scalable web-based multimedia
presentation servers. Dr. Prabhakaran received the prestigious National Science Foundation (NSF) CAREER Award in 2003 for
his proposal on Animation Databases. He has published several research papers in various refereed conferences and journals
in this area.
He has served as guest-editor (special issue on Multimedia Authoring and Presentation) for ACM Multimedia Systems journal.
He is also serving on the editorial board of Multimedia Tools and Applications journal, Kluwer Academic Publishers. He has
also served as program committee member on several multimedia conferences and workshops.
B. Prabhakaran has served as a visiting research faculty with the Department of Computer Science, University of Maryland,
College Park. He also served as a faculty in the Department of Computer Science, National University of Singapore as well
as in the Indian Institute of Technology, Madras, India. 相似文献
8.
An important objective of next-generation wireless networks is to provide quality of service (QoS) guarantees. This requires
a simple and efficient wireless channel model that can easily translate into connection-level QoS measures such as data rate,
delay and delay-violation probability. To achieve this, in Wu and Negi (IEEE Trans. on Wireless Communications 2(4) (2003)
630–643), we developed a link-layer channel model termed effective capacity, for the setting of a single hop, constant-bit-rate arrivals, fluid traffic, and wireless channels with negligible propagation
delay. In this paper, we apply the effective capacity technique to deriving QoS measures for more general situations, namely,
(1) networks with multiple wireless links, (2) variable-bit-rate sources, (3) packetized traffic, and (4) wireless channels
with non-negligible propagation delay.
Dapeng Wu received B.E. in Electrical Engineering from Huazhong University of Science and Technology, Wuhan, China, in 1990, M.E. in
Electrical Engineering from Beijing University of Posts and Telecommunications, Beijing, China, in 1997, and Ph.D. in Electrical
and Computer Engineering from Carnegie Mellon University, Pittsburgh, PA, in 2003. From July 1997 to December 1999, he conducted
graduate research at Polytechnic University, Brooklyn, New York. During the summers of 1998, 1999 and 2000, he conducted research
at Fujitsu Laboratories of America, Sunnyvale, California, on architectures and traffic management algorithms in the Internet
and wireless networks for multimedia applications.
Since August 2003, he has been with Electrical and Computer Engineering Department at University of Florida, Gainesville,
FL, as an Assistant Professor. His research interests are in the areas of networking, communications, multimedia, signal processing,
and information and network security. He received the IEEE Circuits and Systems for Video Technology (CSVT) Transactions Best
Paper Award for Year 2001.
Currently, he is an Associate Editor for the IEEE Transactions on Vehicular Technology and Associate Editor for International
Journal of Ad Hoc and Ubiquitous Computing. He served as Program Chair for IEEE/ACM First International Workshop on Broadband
Wireless Services and Applications (BroadWISE 2004); and as TPC member of over 20 conferences such as IEEE INFOCOM'05, IEEE
ICC'05, IEEE WCNC'05, and IEEE Globecom'04. He is Vice Chair of Mobile and wireless multimedia Interest Group (MobIG), Technical
Committee on Multimedia Communications, IEEE Communications Society. He is a member of the Award Committee, Technical Committee
on Multimedia Communications, IEEE Communications Society. He is also Director of Communications, IEEE Gainesville Section.
Rohit Negi received the B.Tech. degree in Electrical Engineering from the Indian Institute of Technology, Bombay, India in 1995. He
received the M.S. and Ph.D. degrees from Stanford University, CA, USA, in 1996 and 2000 respectively, both in Electrical Engineering.
He has received the President of India Gold medal in 1995.
Since 2000, he has been with the Electrical and Computer Engineering department at Carnegie Mellon University, Pittsburgh,
PA, USA, where he is an Assistant Professor. His research interests include signal processing, coding for communications systems,
information theory, networking, cross-layer optimization and sensor networks. 相似文献
9.
In this paper, we develop an analytical model to evaluate the delay performance of the burst-frame-based CSMA/CA protocol
under unsaturated conditions, which has not been fully addressed in the literature. Our delay analysis is unique in that we
consider the end-to-end packet delay, which is the duration from the epoch that a packet enters the queue at the MAC layer
of the transmitter side to the epoch that the packet is successfully received at the receiver side. The analytical results
give excellent agreement with the simulation results, which represents the accuracy of our analytical model. The results also
provide important guideline on how to set the parameters of the burst assembly policy. Based on these results, we further
develop an efficient adaptive burst assembly policy so as to optimize the throughput and delay performance of the burst-frame-based
CSMA/CA protocol.
Kejie Lu received the B.E. and M.E. degrees in Telecommunications Engineering from Beijing University of Posts and Telecommunications,
Beijing, China, in 1994 and 1997, respectively. He received the Ph.D. degree in Electrical Engineering from the University
of Texas at Dallas in 2003. In 2004 and 2005, he was a postdoctoral research associate in the Department of Electrical and
Computer Engineering, University of Florida. Currently, he is an assistant professor in the Department of Electrical and Computer
Engineering, University of Puerto Rico at Mayagüez. His research interests include architecture and protocols design for computer
and communication networks, performance analysis, network security, and wireless communications.
Jianfeng Wang received the B.E. and M.E. degrees in electrical engineering from Huazhong University of Science and Technology, China, in
1999 and 2002, respectively, and the Ph.D. degree in electrical engineering from University of Florida in 2006. From January
2006 to July 2006, he was a research intern in wireless standards and technology group, Intel Corporation. In October 2006,
he joined Philips Research North America as a senior member research staff in wireless communications and networking department.
He is engaged in research and standardization on wireless networks with emphasis on medium access control (MAC).
Dapeng Wu received B.E. in Electrical Engineering from Huazhong University of Science and Technology, Wuhan, China, in 1990, M.E. in
Electrical Engineering from Beijing University of Posts and Telecommunications, Beijing, China, in 1997, and Ph.D. in Electrical
and Computer Engineering from Carnegie Mellon University, Pittsburgh, PA, in 2003.
Since August 2003, he has been with Electrical and Computer Engineering Department at University of Florida, Gainesville,
FL, as an Assistant Professor. His research interests are in the areas of networking, communications, multimedia, signal processing,
and information and network security. He received the IEEE Circuits and Systems for Video Technology (CSVT) Transactions Best
Paper Award for Year 2001, and the Best Paper Award in International Conference on Quality of Service in Heterogeneous Wired/Wireless
Networks (QShine) 2006.
Currently, he serves as the Editor-in-Chief of Journal of Advances in Multimedia, and an Associate Editor for IEEE Transactions
on Wireless Communications, IEEE Transactions on Circuits and Systems for Video Technology, IEEE Transactions on Vehicular
Technology, and International Journal of Ad Hoc and Ubiquitous Computing. He is also a guest-editor for IEEE Journal on Selected
Areas in Communications (JSAC), Special Issue on Cross-layer Optimized Wireless Multimedia Communications. He served as Program
Chair for IEEE/ACM First International Workshop on Broadband Wireless Services and Applications (BroadWISE 2004); and as a
technical program committee member of over 30 conferences. He is Vice Chair of Mobile and wireless multimedia Interest Group
(MobIG), Technical Committee on Multimedia Communications, IEEE Communications Society. He is a member of the Best Paper Award
Committee, Technical Committee on Multimedia Communications, IEEE Communications Society.
Yuguang Fang received a Ph.D. degree in Systems Engineering from Case Western Reserve University in January 1994 and a Ph.D. degree in
Electrical Engineering from Boston University in May 1997. He was an assistant professor in the Department of Electrical and
Computer Engineering at New Jersey Institute of Technology from July 1998 to May 2000. He then joined the Department of Electrical
and Computer Engineering at University of Florida in May 2000 as an assistant professor and got an early promotion to an associate
professor with tenure in August 2003 and to a full professor in August 2005. He has published over 200 papers in refereed
professional journals and conferences. He received the National Science Foundation Faculty Early Career Award in 2001 and
the Office of Naval Research Young Investigator Award in 2002. He has served on several editorial boards of technical journals
including IEEE Transactions on Communications, IEEE Transactions on Wireless Communications, IEEE Transactions on Mobile Computing
and ACM Wireless Networks. He have also been actively participating in professional conference organizations such as serving
as The Steering Committee Co-Chair for QShine, the Technical Program Vice-Chair for IEEE INFOCOM’2005, Technical Program Symposium
Co-Chair for IEEE Globecom’2004, and a member of Technical Program Committee for IEEE INFOCOM (1998, 2000, 2003–2007). He
is a senior member of the IEEE. 相似文献
10.
In order to support the diverse Quality of Service (QoS) requirements for differentiated data applications in broadband wireless
networks, advanced techniques such as space-time coding (STC) and orthogonal frequency division multiplexing (OFDM) are implemented
at the physical layer. However, the employment of such techniques evidently affects the subchannel-allocation algorithms at
the medium access control (MAC) layer. In this paper, we propose the QoS-driven cross-layer subchannel-allocation algorithms
for data transmissions over asynchronous uplink space-time OFDM-CDMA wireless networks. We mainly focus on QoS requirements
of maximizing the best-effort throughput and proportional bandwidth fairness, while minimizing the upper-bound of scheduling
delay. Our extensive simulations show that the proposed infrastructure and algorithms can achieve high bandwidth fairness
and system throughput while reducing scheduling delay over wireless networks.
Xi Zhang (S’89-SM’98) received the B.S. and M.S. degrees from Xidian University, Xi’an, China, the M.S. degree from Lehigh University,
Bethlehem, PA, all in electrical engineering and computer science, and the Ph.D. degree in electrical engineering and computer
science (Electrical Engineering—Systems) from The University of Michigan, Ann Arbor, USA.
He is currently an Assistant Professor and the Founding Director of the Networking and Information Systems Laboratory, Department
of Electrical and Computer Engineering, Texas A&M University, College Station, Texas, USA. He was an Assistant Professor and
the Founding Director of the Division of Computer Systems Engineering, Department of Electrical Engineering and Computer Science,
Beijing Information Technology Engineering Institute, Beijing, China, from 1984 to 1989. He was a Research Fellow with the
School of Electrical Engineering, University of Technology, Sydney, Australia, and the Department of Electrical and Computer
Engineering, James Cook University, Queensland, Australia, under a Fellowship from the Chinese National Commission of Education.
He worked as a Summer Intern with the Networks and Distributed Systems Research Department, Bell Laboratories, Murray Hills,
NJ, and with AT&T Laboratories Research, Florham Park, NJ, in 1997. He has published more than 80 technical papers. His current
research interests focus on the areas of wireless networks and communications, mobile computing, cross-layer designs and optimizations
for QoS guarantees over mobile wireless networks, wireless sensor and Ad Hoc networks, wireless and wireline network security,
network protocols design and modeling for QoS guarantees over multicast (and unicast) wireless (and wireline) networks, statistical
communications theory, random signal processing, and distributed computer-control systems.
Dr. Zhang received the U.S. National Science Foundation CAREER Award in 2004 for his research in the areas of mobile wireless
and multicast networking and systems. He is currently serving as an Editor for the IEEE Transactions on Wireless Communications,
an Associated Editor for the IEEE Transactions on Vehicular Technology, and and Associated Editor for the IEEE Communications
Letters, and is also currently serving as a Guest Editor for the IEEE Wireless Communications Magazine for the Special Issues
of “Next Generation of CDMA vs. OFDMA for 4G Wireless Applications”. He has served or is serving as the Panelist on the U.S.
National Science Foundation Research-Proposal Review Panel in 2004, the WiFi-Hotspots/WLAN and QoS Panelist at the IEEE QShine
2004, as the Symposium Chair for the IEEE International Cross-Layer Designs and Protocols Symposium within the IEEE International
Wireless Communications and Mobile Computing Conference (IWCMC) 2006, the Technical Program Committee Co-Chair for the IEEE
IWCMC 2006, the Poster Chair for the IEEE QShine 2006, the Publicity Co-Chair for the IEEE WirelessCom 2005, and as the Technical
Program Committee members for IEEE GLOBECOM, IEEE ICC, IEEE WCNC, IEEE VTC, IEEE QShine, IEEE WoWMoM, IEEE WirelessCom, and
IEEE EIT. He is a Senior Member of the IEEE and a member of the Association for Computing Machinery (ACM).
Jia Tang (S’03) received the B.S. degree in electrical engineering from Xi’an Jiaotong University, Xi’an, China, in 2001. He is currently
a Research Assistant working towards the Ph.D. degree in the Networking and Information Systems Laboratory, Department of
Electrical and Computer Engineering, Texas A&M University, College Station, Texas, USA. His research interests include mobile
wireless communications and networks, with emphasis on cross-layer design and optimizations, wireless quality-of-service (QoS)
provisioning for mobile multimedia networks, wireless diversity techniques, and wireless resource allocation.
Mr. Tang received the Fouraker Graduate Research Fellowship Award from the Department of Electrical and Computer Engineering,
Texas A&M University in 2005. 相似文献
11.
A Performance Evaluation of a Novel Energy-Aware Data-Centric Routing Algorithm in Wireless Sensor Networks 总被引:2,自引:0,他引:2
In this paper, we present a novel Energy-Aware Data-Centric Routing algorithm for wireless sensor networks, which we refer to as EAD. We discuss the algorithm and its implementation, and report on the performance results of several workloads using the network simulator ns-2. EAD represents an efficient energy-aware distributed protocol to build a rooted broadcast tree with many leaves, and facilitate the data-centric routing in wireless micro sensor networks. The idea is to turn off the radios of all leaf nodes and let the non-leaf nodes be in charge of data aggregation and relaying tasks. The main contribution of this protocol is the introduction of a novel approach based on a low cost backbone provisioning within a wireless sensor network in order to turn off the non backbone nodes and save energy without compromising the connectivity of the network, and thereby extending the network lifetime. EAD makes no assumption on the network topology, and it is based on a residual power. We present an extensive simulation experiments to evaluate the performance of our EAD forwarding-to-parent routing scheme over a tree created by a single EAD execution, and compare it with the routing scheme over a regular Ad hoc On-Demand Distance Vector (AODV) Protocol. Last but not least, we evaluate the performance of our proposed EAD algorithm and compare it to the Low-Energy Adaptive Clustering Hierarchy (LEACH) protocol, a cluster-based, energy-aware routing protocol specifically designed for sensor networks. Our results indicate clearly that EAD outperforms AODV and LEACH in energy conservation, throughput, and network lifetime extension.Dr. A. Boukerche was partially supported by NSERC, Canada Research Program, Canada Foundation for Innovation, and Ontario Innovation Funds/Ontario Distinguished Research Award.Azzedine Boukerche is a Full Professor and holds a Canada Research Chair Position at the University of Ottawa. He is also the Founding Director of PARADISE Research Laboratory at Ottawa U. Prior to this, he hold a faculty position at the University of North Texas, USA, and he was working as a Senior Scientist at the Simulation Sciences Division, Metron Corporation located in San Diego. He was also employed as a Faculty at the School of Computer Science McGill University, and taught at Polytechnic of Montreal. He spent a year at the JPL-California Institute of Technology where he contributed to a project centered about the specification and verification of the software used to control interplanetary spacecraft operated by JPL/NASA Laboratory.His current research interests include wireless networks, mobile and pervasive computing, wireless multimedia, QoS service provisioning, wireless ad hoc and sensor networks, distributed systems, distributed computing, large-scale distributed interactive simulation, and performance modeling. Dr. Boukerche has published several research papers in these areas. He was the recipient of the best research paper award at PADS’97, and the recipient of the 3rd National Award for Telecommunication Software 1999 for his work on a distributed security systems on mobile phone operations, and has been nominated for the best paper award at the IEEE/ACM PADS’99, and at ACM MSWiM 2001. Dr. A. Boukerche serves as an Associate Editor and on the editorial board for ACM/Springer Wireless Networks, the Journal of Parallel and Distributed Computing, The Wiley Journal of Wireless Communication and Mobile Computing. He served as a Founding and General Chair of the first Int’l Conference on Quality of Service for Wireless/Wired Heterogeneous Networks (QShine 2004), ACM/IEEE MASCOST 1998, IEEE DS-RT 1999-2000, ACM MSWiM 2000; Program Chair for ACM/IFIPS Europar 2002, IEEE/SCS Annual Simulation Symposium ANNS 2002, ACM WWW’02, IEEE/ACM MASCOTS 2002, IEEE Wireless Local Networks WLN 03-04; IEEE WMAN 04-05, ACM MSWiM 98–99, and TPC member of numerous IEEE and ACM conferences. He served as a Guest Editor for JPDC, and ACM/kluwer Wireless Networks and ACM/Kluwer Mobile Networks Applications, and the Journal of Wireless Communication and Mobile Computing.Dr. Boukerche serves as a Steering Committee Chair for ACM MSWiM, IEEE DS-RT, and ACM PE-WASUN Conferences.Xiuzhen Cheng is an Assistant Professor in the Department of Computer Science at the George Washington University. She received her MS and Ph.D. degrees in Computer Science from University of Minnesota—Twin Cities in 2000 and 2002, respectively. Her current research interests include localization, data aggregation services, and data storage in sensor networks, routing in mobile ad hoc networks, and approximation algorithm design and analysis. She is a member of the ACM and IEEE.Joseph Linus has recently graduated with a MSc Degree from the Department of Computer Sciences, University of North Texas. His current research interests include wireless sensors networks, and mobile ad hoc networks. 相似文献
12.
Connected coverage, which reflects how well a target field is monitored under the base station, is the most important performance
metric used to measure the quality of surveillance that wireless sensor networks (WSNs) can provide. To facilitate the measurement
of this metric, we propose two novel algorithms for individual sensor nodes to identify whether they are on the coverage boundary,
i.e., the boundary of a coverage hole or network partition. Our algorithms are based on two novel computational geometric
techniques called localized Voronoi and neighbor embracing polygons. Compared to previous work, our algorithms can be applied
to WSNs of arbitrary topologies. The algorithms are fully distributed in the sense that only the minimal position information
of one-hop neighbors and a limited number of simple local computations are needed, and thus are of high scalability and energy
efficiency. We show the correctness and efficiency of our algorithms by theoretical proofs and extensive simulations.
Chi Zhang received the B.E. and M.E. degrees in Electrical Engineering from Huazhong University of Science and Technology, Wuhan, China,
in July 1999 and January 2002, respectively. Since September 2004, he has been working towards the Ph.D. degree in the Department
of Electrical and Computer Engineering at the University of Florida, Gainesville, Florida, USA. His research interests are
network and distributed system security, wireless networking, and mobile computing, with emphasis on mobile ad hoc networks,
wireless sensor networks, wireless mesh networks, and heterogeneous wired/wireless networks.
Yanchao Zhang received the B.E. degree in computer communications from Nanjing University of Posts and Telecommunications, Nanjing, China,
in July 1999, the M.E. degree in computer applications from Beijing University of Posts and Telecommunications, Beijing, China,
in April 2002, and the Ph.D. degree in electrical and computer engineering from the University of Florida, Gainesville, in
August 2006. Since September 2006, he has been an Assistant Professor in the Department of Electrical and Computer Engineering,
New Jersey Institute of Technology, Newark. His research interest include wireless and Internet security, wireless networking,
and mobile computing. He is a member of the IEEE and ACM.
Yuguang Fang received the BS and MS degrees in Mathematics from Qufu Normal University, Qufu, Shandong, China, in 1984 and 1987, respectively,
a Ph.D. degree in Systems and Control Engineering from Department of Systems, Control and Industrial Engineering at Case Western
Reserve University, Cleveland, Ohio, in January 1994, and a Ph.D. degree in Electrical Engineering from Department of Electrical
and Computer Engineering at Boston University, Massachusetts, in May 1997.
From 1987 to 1988, he held research and teaching position in both Department of Mathematics and the Institute of Automation
at Qufu Normal University. From September 1989 to December 1993, he was a teaching/research assistant in Department of Systems,
Control and Industrial Engineering at Case Western Reserve University, where he held a research associate position from January
1994 to May 1994. He held a post-doctoral position in Department of Electrical and Computer Engineering at Boston University
from June 1994 to August 1995. From September 1995 to May 1997, he was a research assistant in Department of Electrical and
Computer Engineering at Boston University. From June 1997 to July 1998, he was a Visiting Assistant Professor in Department
of Electrical Engineering at the University of Texas at Dallas. From July 1998 to May 2000, he was an Assistant Professor
in the Department of Electrical and Computer Engineering at New Jersey Institute of Technology, Newark, New Jersey. In May
2000, he joined the Department of Electrical and Computer Engineering at University of Florida, Gainesville, Florida, where
he got early promotion to Associate Professor with tenure in August 2003, and to Full Professor in August 2005. His research
interests span many areas including wireless networks, mobile computing, mobile communications, wireless security, automatic
control, and neural networks. He has published over one hundred and fifty (150) papers in refereed professional journals and
conferences. He received the National Science Foundation Faculty Early Career Award in 2001 and the Office of Naval Research
Young Investigator Award in 2002. He also received the 2001 CAST Academic Award. He is listed in Marquis Who’s Who in Science
and Engineering, Who’s Who in America and Who’s Who in World.
Dr. Fang has actively engaged in many professional activities. He is a senior member of the IEEE and a member of the ACM.
He is an Editor for IEEE Transactions on Communications, an Editor for IEEE Transactions on Wireless Communications, an Editor
for IEEE Transactions on Mobile Computing, an Editor for ACM Wireless Networks, and an Editor for IEEE Wireless Communications.
He was an Editor for IEEE Journal on Selected Areas in Communications:Wireless Communications Series, an Area Editor for ACM
Mobile Computing and Communications Review, an Editor for Wiley International Journal on Wireless Communications and Mobile
Computing, and Feature Editor for Scanning the Literature in IEEE Personal Communications. He has also actively involved with
many professional conferences such as ACM MobiCom’02 (Committee Co-Chair for Student Travel Award), MobiCom’01, IEEE INFOCOM’06,
INFOCOM’05 (Vice-Chair for Technical Program Committee), INFOCOM’04, INFOCOM’03, INFOCOM’00, INFOCOM’98, IEEE WCNC’04, WCNC’02,
WCNC’00 Technical Program Vice-Chair), WCNC’99, IEEE Globecom’04 (Symposium Co-Chair), Globecom’02, and International Conference
on Computer Communications and Networking (IC3N) (Technical Program Vice-Chair). 相似文献
13.
Packet buffering-and-forwarding is a simple mechanism and has been widely used to provide seamless handoffs in many wireless/mobile
networks. However, some undesirable side effects of this mechanism, if not managed appropriately, can easily diminish its
effectiveness in providing seamless inter-cell transitions during a handoff. We first examine these side effects and show
how inappropriate buffer management by a mobility agent could affect the TCP performance. The throughput of TCP is then studied
with special emphasis on the effects of a handoff. We then propose a Last-Come-First-Drop (LCFD) buffer management policy
(to be employed by mobility agents) and post-handoff acknowledgement suppression (to be used by mobile nodes) to improvement
the TCP performance. Our enhancements are backward compatible and suitable for the gradual/incremental deployment. By deriving
an analytical model and conducting numerical analysis, we show that our scheme can improve the TCP throughput up to 30%. Finally,
we conduct the ns-2-based simulation to confirm these numerical results, and demonstrate the applicability of the analytic model for predicting
TCP throughput in other handoff schemes.
Chun-Ting Chou is currently a senior member research staff in Philips Research North America, Briarcliff Manor, New York. He received both
the B.S. and M.S. degrees in Electrical Engineering from National Taiwan University in 1995 and 1997, respectively. He received
the Ph.D. degree in Electrical Engineering and Computer Science from the University of Michigan, Ann Arbor, in 2004. He is
actively involved in standardization of WiMedia Ultra-Wide Band (UWB) Wireless PANs, IEEE 802.15.3c high-speed wireless PANs
and IEEE 802.15.5 meshed Wireless PANs. His current research interests include quality of service (QoS), MAC protocols for
UWB Wireless PANs, 60-GHz wireless PANs using directional antennas, meshed wireless LANs and PANs, and spectrum agile and
cooperative communication.
Kang G. Shin is the Kevin and Nancy O’Connor Professor of Computer Science and Founding Director of the Real-Time Computing Laboratory
in the Department of Electrical Engineering and Computer Science, The University of Michigan, Ann Arbor, Michigan. His current
research focuses on QoS-sensitive networking and computing as well as on embedded real-time OS, middleware and applications,
all with emphasis on timeliness and dependability. He has supervised the completion of 54 PhD theses, and authored/coauthored
around 630 technical papers and numerous book chapters in the areas of distributed real-time computing and control, computer
networking, fault-tolerant computing, and intelligent manufacturing. He has co-authored (jointly with C. M. Krishna) a textbook
“Real-Time Systems,” McGraw Hill, 1997.
He has received a number of best paper awards, including the IEEE Communications Society William R. Bennett Prize Paper Award
in 2003, the Best Paper Award from the IWQoS’03 in 2003, and an Outstanding IEEE Transactions of Automatic Control Paper Award
in 1987. He has also coauthored papers with his students which received the Best Student Paper Awards from the 1996 IEEE Real-Time
Technology and Application Symposium, and the 2000 UNSENIX Technical Conference. He has also received several institutional
awards, including the Research Excellence Award in 1989, Outstanding Achievement Award in 1999, Service Excellence Award in
2000, Distinguished Faculty Achievement Award in 2001, and Stephen Attwood Award in 2004 from The University of Michigan;
a Distinguished Alumni Award of the College of Engineering, Seoul National University in 2002; and 2003 IEEE RTC Technical
Achievement Award.
He received the B.S. degree in Electronics Engineering from Seoul National University, Seoul, Korea in 1970, and both the
M.S. and Ph.D degrees in Electrical Engineering from Cornell University, Ithaca, New York in 1976 and 1978, respectively.
From 1978 to 1982 he was on the faculty of Rensselaer Polytechnic Institute, Troy, New York. He has held visiting positions
at the U.S. Airforce Flight Dynamics Laboratory, AT &T Bell Laboratories, Computer Science Division within the Department
of Electrical Engineering and Computer Science at UC Berkeley, and International Computer Science Institute, Berkeley, CA,
IBM T. J. Watson Research Center, Software Engineering Institute at Carnegie Mellon University, and HP Research Laboratories.
He also chaired the Computer Science and Engineering Division, EECS Department, The University of Michigan for three years
beginning January 1991.
He is Fellow of IEEE and ACM, and member of the Korean Academy of Engineering, is serving as the General Chair for the 3rd
ACM/USENIX International Conference on Mobile Systems, Applications, and Services (MobiSys’05), was the General Chair of the
2000 IEEE Real-Time Technology and Applications Symposium, the Program Chair of the 1986 IEEE Real-Time Systems Symposium
(RTSS), the General Chair of the 1987 RTSS, the Guest Editor of the 1987 August special issue of IEEE Transactions on Computers on Real-Time Systems, a Program Co-Chair for the 1992 International Conference on Parallel Processing, and served numerous technical program committees. He also chaired the IEEE Technical Committee on Real-Time Systems during
1991--93, was a Distinguished Visitor of the Computer Society of the IEEE, an Editor of IEEE Trans. on Parallel and Distributed Computing, and an Area Editor ofInternational Journal of Time-Critical Computing Systems,Computer Networks, and ACM Transactions on Embedded Systems. 相似文献
14.
We propose an innovative resource management scheme for TDMA based mobile ad hoc networks. Since communications between some
important nodes in the network are more critical, they should be accepted by the network with high priority in terms of network
resource usage and quality of service (QoS) support. In this scheme, we design a location-aware bandwidth pre-reservation
mechanism, which takes advantage of each mobile node’s geographic location information to pre-reserve bandwidth for such high
priority connections and thus greatly reduces potential scheduling conflicts for transmissions. In addition, an end-to-end
bandwidth calculation and reservation algorithm is proposed to make use of the pre-reserved bandwidth. In this way, time slot
collisions among different connections and in adjacent wireless links along a connection can be reduced so that more high
priority connections can be accepted into the network without seriously hurting admissions of other connections. The salient
feature of our scheme is the collaboration between the routing and MAC layer that results in the more efficient spatial reuse
of limited resources, which demonstrates how cross-layer design leads to better performance in QoS support. Extensive simulations
show that our scheme can successfully provide better communication quality to important nodes at a relatively low price. Finally,
several design issues and future work are discussed.
Xiang Chen received the B.E. and M.E. degrees in electrical engineering from Shanghai Jiao Tong University, Shanghai, China, in 1997
and 2000, respectively. Afterwards, he worked as a MTS (member of technical staff) in Bell Laboratories, Beijing, China. He
is currently working toward the Ph.D. degree in the department of Electrical and Computer Engineering at the University of
Florida. His research is focused on protocol design and performance evaluation in wireless networks, including cellular networks,
wireless LANs, and mobile ad hoc networks. He is a member of Tau Beta Pi and a student member of IEEE.
Wei Liu received the BE and ME degrees in electrical engineering from Huazhong University of Science and Technology, Wuhan, China,
in 1998 and 2001, respectively. He is currently pursuing the P.hD. degree in the Department of Electrical and Computer Engineering,
University of Florida, Gainesville, where he is a research assistant in the Wireless Networks Laboratory (WINET). His research
interest includes QoS, secure and power efficient routing, and MAC protocols in mobile ad hoc networks and sensor networks.
He is a student member of the IEEE.
Hongqiang Zhai received the B.E. and M.E. degrees in electrical engineering from Tsinghua University, Beijing, China, in July 1999 and January
2002 respectively. He worked as a research intern in Bell Labs Research China from June 2001 to December 2001, and in Microsoft
Research Asia from January 2002 to July 2002. Currently he is pursuing the Ph.D. degree in the Department of Electrical and
Computer Engineering, University of Florida. He is a student member of IEEE.
Yuguang Fang received a Ph.D. degree in Systems and Control Engineering from Case Western Reserve University in January 1994, and a Ph.D.
degree in Electrical Engineering from Boston University in May 1997. From June 1997 to July 1998, he was a Visiting Assistant
Professor in Department of Electrical Engineering at the University of Texas at Dallas. From July 1998 to May 2000, he was
an Assistant Professor in the Department of Electrical and Computer Engineering at New Jersey Institute of Technology. In
May 2000, he joined the Department of Electrical and Computer Engineering at University of Florida where he got the early
promotion to Associate Professor with tenure in August 2003 and to Full Professor in August 2005. He has published over 180
papers in refereed professional journals and conferences. He received the National Science Foundation Faculty Early Career
Award in 2001 and the Office of Naval Research Young Investigator Award in 2002. He is currently serving as an Editor for
many journals including IEEE Transactions on Communications, IEEE Transactions on Wireless Communications, IEEETransactions
on Mobile Computing, and ACM Wireless Networks. He is also actively participating in conference organization such as the Program
Vice-Chair for IEEE INFOCOM’2005, Program Co-Chair for the Global Internet and Next Generation Networks Symposium in IEEE
Globecom’2004 and the Program Vice Chair for 2000 IEEE Wireless Communications and Networking Conference (WCNC’2000). 相似文献
15.
To efficiently support quality of service (QoS) in future wireless networks, it is important to model a wireless channel in
terms of connection-level QoS metrics such as data rate, delay and delay-violation probability. To achieve this, in [7], we
proposed and developed a link-layer channel model termed effective capacity (EC) for flat fading channels. In this paper, we apply the effective capacity technique to modeling frequency selective fading
channels. Specifically, we utilize the duality between the distribution of a queue with superposition of N i.i.d. sources, and the distribution of a queue with a frequency-selective fading channel that consists of N i.i.d. sub-channels, to model a frequency selective fading channel. In the proposed model, a frequency selective fading channel
is modeled by three EC functions; we also propose a simple and efficient algorithm to estimate these EC functions. Simulation
results show that the actual QoS metric is closely approximated by the QoS metric predicted by the proposed EC channel model.
The accuracy of the prediction using our model can translate into efficiency in admission control and resource reservation.
Dapeng Wu received B.E. in Electrical Engineering from Huazhong University of Science and Technology, Wuhan, China, in 1990, M.E. in
Electrical Engineering from Beijing University of Posts and Telecommunications, Beijing, China, in 1997, and Ph.D. in Electrical
and Computer Engineering from Carnegie Mellon University, Pittsburgh, PA, in 2003. From July 1997 to December 1999, he conducted
graduate research at Polytechnic University, Brooklyn, New York. During the summers of 1998, 1999 and 2000, he conducted research
at Fujitsu Laboratories of America, Sunnyvale, California, on architectures and traffic management algorithms in the Internet
and wireless networks for multimedia applications.
Since August 2003, he has been with Electrical and Computer Engineering Department at University of Florida, Gainesville,
FL, as an Assistant Professor. His research interests are in the areas of networking, communications, multimedia, signal processing,
and information and network security. He received the IEEE Circuits and Systems for Video Technology (CSVT) Transactions Best
Paper Award for Year 2001.
Currently, he is an Associate Editor for the IEEE Transactions on Vehicular Technology and Associate Editor for International
Journal of Ad Hoc and Ubiquitous Computing. He served as Program Chair for IEEE/ACM First International Workshop on Broadband
Wireless Services and Applications (BroadWISE 2004); and as TPC member of over 30 conferences. He is Vice Chair of Mobile
and wireless multimedia Interest Group (MobIG), Technical Committee on Multimedia Communications, IEEE Communications Society.
He is a member of the Best Paper Award Committee, Technical Committee on Multimedia Communications, IEEE Communications Society.
He is also Director of Communications, IEEE Gainesville Section.
Rohit Negi received the B.Tech. degree in Electrical Engineering from the Indian Institute of Technology, Bombay, India in 1995. He
received the M.S. and Ph.D. degrees from Stanford University, CA, USA, in 1996 and 2000 respectively, both in Electrical Engineering.
He has received the President of India Gold medal in 1995.
Since 2000, he has been with the Electrical and Computer Engineering department at Carnegie Mellon University, Pittsburgh,
PA, USA, where he is an Associate Professor. His research interests include signal processing, coding for communications systems,
information theory, networking, cross-layer optimization and sensor networks. 相似文献
16.
In this paper, we study rate allocation for a set of end-to-end communication sessions in multi-radio wireless mesh networks.
We propose cross-layer schemes to solve the joint rate allocation, routing, scheduling, power control and channel assignment
problems with the goals of maximizing network throughput and achieving certain fairness. Fairness is addressed using both
a simplified max-min fairness model and the well-known proportional fairness model. Our schemes can also offer performance
upper bounds such as an upper bound on the maximum throughput. Numerical results show that our proportional fair rate allocation
scheme achieves a good tradeoff between throughput and fairness.
Jian Tang is an assistant professor in the Department of Computer Science at Montana State University. He received the Ph.D. degree
in Computer Science from Arizona State University in 2006. His research interest is in the area of wireless networking and
mobile computing. He has served on the technical program committees of multiple international conferences, including ICC,
Globecom, IPCCC and QShine. He will also serve as a publicity co-chair of International Conference on Autonomic Computing and Communication Systems (Autonomics’2007).
Guoliang Xue is a Full Professor in the Department of Computer Science and Engineering at Arizona State University. He received the Ph.D.
degree in Computer Science from the University of Minnesota in 1991 and has held previous positions at the Army High Performance
Computing Research Center and the University of Vermont. His research interests include efficient algorithms for optimization
problems in networking, with applications to fault tolerance, robustness, and privacy issues in networks ranging from WDM
optical networks to wireless ad hoc and sensor networks. He has published over 150 papers in these areas. His research has
been continuously supported by federal agencies including NSF and ARO. He is the recipient of an NSF Research Initiation Award
in 1994 and an NSF-ITR Award in 2003. He is an Associate Editor of Computer Networks (COMNET), the IEEE Network Magazine,
and Journal of Global Optimization. He has served on the executive/program committees of many IEEE conferences, including
INFOCOM, SECON, IWQOS, ICC, GLOBECOM and QShine. He is the General Chair of IEEE IPCCC’2005, a TPC co-Chair of IPCCC’2003, HPSR’2004, IEEE Globecom’2006 Symposium on Wireless Ad Hoc and Sensor Networks, IEEE ICC’2007 Symposium on Wireless Ad Hoc and Sensor Networks, and QShine’2007. He is a senior member of IEEE.
Weiyi Zhang received the M.E. degree in 1999 from Southeast University, China. Currently he is a Ph.D. student in the Department of Computer
Science and Engineering at Arizona State University. His research interests include reliable communication in networking,
protection and restoration in WDM networks, and QoS provisioning in communication networks. 相似文献
17.
The traffic-adaptive medium access protocol (TRAMA) is introduced for energy-efficient collision-free channel access in wireless
sensor networks. TRAMA reduces energy consumption by ensuring that unicast and broadcast transmissions incur no collisions,
and by allowing nodes to assume a low-power, idle state whenever they are not transmitting or receiving. TRAMA assumes that
time is slotted and uses a distributed election scheme based on information about traffic at each node to determine which
node can transmit at a particular time slot. Using traffic information, TRAMA avoids assigning time slots to nodes with no
traffic to send, and also allows nodes to determine when they can switch off to idle mode and not listen to the channel. TRAMA
is shown to be fair and correct, in that no idle node is an intended receiver and no receiver suffers collisions. An analytical
model to quantify the performance of TRAMA is presented and the results are verified by simulation. The performance of TRAMA
is evaluated through extensive simulations using both synthetic- as well as sensor-network scenarios. The results indicate
that TRAMA outperforms contention-based protocols (CSMA, 802.11 and S-MAC) and also static scheduled-access protocols (NAMA)
with significant energy savings.
This work was supported in part by the NSF-NGI grant number ANI-9813724 and by the Jack Baskin Chair of Computer Engineering
at UCSC.
Venkatesh Rajendran received the B.E. degree in Electronics and Communication Engineering from the Anna University in 2001, and M.S. in Computer
Engineering from the University of California, Santa Cruz (UCSC) in 2003. He is currently working towards his Ph.D at UCSC.
He is a graduate student researcher at the Inter-networking Research Lab (INRG). His research interests are in wireless communication
system design, energy-aware media access control protocols for wireless ad hoc networks, smart sensor networks, reliable multi-casting,
wireless multi-carrier communications, digital signal processing, adaptive modulation, and smart antenna systems.
Katia Obraczka received the B.S. and M.S. degrees in electrical and computer engineering from the Federal University of Rio de Janeiro,
Brazil, and the M.S. and Ph.D. degrees in computer science from the University of Southern California (USC). She is an Assistant
Professor of Computer Engineering at the University of California, Santa Cruz. Before joining UCSC, she held a research scientist
position at USC's Information Sciences Institute and a research faculty appointment at USC's Computer Science Department.
Her research interests include computer networks, more specifically, network protocol design and evaluation in wire-line as
well as wireless (in particular, multi-hop ad hoc) networks, distributed systems, and Internet information systems.
J.J. Garcia-Luna-Aceves received the M.S. and Ph.D. degrees in electrical engineering from the University of Hawaii, Honolulu, HI, in 1980 and 1983,
respectively. He is the Baskin Professor of Computer Engineering at the University of California, Santa Cruz (UCSC).
Dr. Garcia-Luna-Aceves directs the Computer Communication Research Group (CCRG), which is part of the Information Technologies
Institute of the Baskin School of Engineering at UCSC. He has been a Visiting Professor at Sun Laboratories and a consultant
on protocol design for Nokia. Prior to joining UCSC in 1993, he was a Center Director at SRI International (SRI) in Menlo
Park, California. Dr. Garcia-Luna-Aceves has published a book and more than 250 refereed papers and three U.S patents, and
has directed more than 18 Ph.D. theses at UCSC. He has been Program Co-Chair of ACM MobiHoc 2002 and ACM Mobicom 2000; Chair
of the ACM SIG Multimedia; General Chair of ACM Multimedia '93 and ACM SIGCOMM '88; and Program Chair of IEEE MULTIMEDIA '92,
ACM SIGCOMM '87, and ACM SIGCOMM '86. He has served in the IEEE Internet Technology Award Committee, the IEEE Richard W. Hamming
Medal Committee, and the National Research Council Panel on Digitization and Communications Science of the Army Research Laboratory
Technical Assessment Board. HE has been on the editorial boards of the IEEE/ACM Transactions on Networking, the Multimedia
Systems Journal, and the Journal of High Speed Networks. He received the SRI International Exceptional-Achievement Award in
1985 and 1989, and is a senior member of the IEEE. 相似文献
18.
Quality of service (QoS) support for multimedia services in the IEEE 802.11 wireless LAN is an important issue for such WLANs
to become a viable wireless access to the Internet. In this paper, we endeavor to propose a practical scheme to achieve this
goal without changing the channel access mechanism. To this end, a novel call admission and rate control (CARC) scheme is
proposed. The key idea of this scheme is to regulate the arriving traffic of the WLAN such that the network can work at an
optimal point. We first show that the channel busyness ratio is a good indicator of the network status in the sense that it
is easy to obtain and can accurately and timely represent channel utilization. Then we propose two algorithms based on the
channel busyness ratio. The call admission control algorithm is used to regulate the admission of real-time or streaming traffic
and the rate control algorithm to control the transmission rate of best effort traffic. As a result, the real-time or streaming
traffic is supported with statistical QoS guarantees and the best effort traffic can fully utilize the residual channel capacity
left by the real-time and streaming traffic. In addition, the rate control algorithm itself provides a solution that could
be used above the media access mechanism to approach the maximal theoretical channel utilization. A comprehensive simulation
study in ns-2 has verified the performance of our proposed CARC scheme, showing that the original 802.11 DCF protocol can
statically support strict QoS requirements, such as those required by voice over IP or streaming video, and at the same time,
achieve a high channel utilization.
Hongqiang Zhai received the B.E. and M.E. degrees in electrical engineering from Tsinghua University, Beijing, China, in July 1999 and January
2002 respectively. He worked as a research intern in Bell Labs Research China from June 2001 to December 2001, and in Microsoft
Research Asia from January 2002 to July 2002. Currently he is pursuing the PhD degree in the Department of Electrical and
Computer Engineering, University of Florida. He is a student member of IEEE.
Xiang Chen received the B.E. and M.E. degrees in electrical engineering from Shanghai Jiao Tong University, Shanghai, China, in 1997
and 2000, respectively, and the Ph.D. degree in electrical and computer engineering from the University of Florida, Gainesville,
in 2005. He is currently a Senior Research Engineer at Motorola Labs, Arlington Heights, IL. His research interests include
resource management, medium access control, and quality of service (QoS) in wireless networks. He is a Member of Tau Beta
Pi and a student member of IEEE.
Yuguang Fang received a Ph.D degree in Systems and Control Engineering from Case Western Reserve University in January 1994, and a Ph.D
degree in Electrical Engineering from Boston University in May 1997.
From June 1997 to July 1998, he was a Visiting Assistant Professor in Department of Electrical Engineering at the University
of Texas at Dallas. From July 1998 to May 2000, he was an Assistant Professor in the Department of Electrical and Computer
Engineering at New Jersey Institute of Technology. In May 2000, he joined the Department of Electrical and Computer Engineering
at University of Florida where he got the early promotion with tenure in August 2003 and has been an Associate Professor since
then. He has published over one hundred (100) papers in refereed professional journals and conferences. He received the National
Science Foundation Faculty Early Career Award in 2001 and the Office of Naval Research Young Investigator Award in 2002.
He is currently serving as an Editor for many journals including IEEE Transactions on Communications, IEEE Transactions on
Wireless Communications, IEEE Transactions on Mobile Computing, and ACM Wireless Networks. He is also actively participating
in conference organization such as the Program Vice-Chair for IEEE INFOCOM’2005, Program Co-Chair for the Global Internet
and Next Generation Networks Symposium in IEEE Globecom’2004 and the Program Vice Chair for 2000 IEEE Wireless Communications
and Networking Conference (WCNC’2000). 相似文献
19.
Wireless mesh networks (WMNs) are gaining growing interest as a promising technology for ubiquitous high-speed network access.
While much effort has been made to address issues at physical, data link, and network layers, little attention has been paid
to the security aspect central to the realistic deployment of WMNs. We propose UPASS, the first known secure authentication and billing architecture for large-scale WMNs. UPASS features a novel user-broker-operator
trust model built upon the conventional certificate-based cryptography and the emerging ID-based cryptography. Based on the
trust model, each user is furnished with a universal pass whereby to realize seamless roaming across WMN domains and get ubiquitous network access. In UPASS, the incontestable billing
of mobile users is fulfilled through a lightweight realtime micropayment protocol built on the combination of digital signature
and one-way hash-chain techniques. Compared to conventional solutions relying on a home-foreign-domain concept, UPASS eliminates
the need for establishing bilateral roaming agreements and having realtime interactions between potentially numerous WMN operators.
Our UPASS is shown to be secure and lightweight, and thus can be a practical and effective solution for future large-scale
WMNs.
Yanchao Zhang received the B.E. degree in Computer Communications from Nanjing University of Posts and Telecommunications, Nanjing, China,
in July 1999, and the M.E. degree in Computer Applications from Beijing University of Posts and Telecommunications, Beijing,
China, in April 2002. Since September 2002, he has been working towards the Ph.D. degree in the Department of Electrical and
Computer Engineering at the University of Florida, Gainesville, Florida, USA. His research interests are network and distributed
system security, wireless networking, and mobile computing, with emphasis on mobile ad hoc networks, wireless sensor networks,
wireless mesh networks, and heterogeneous wired/wireless networks.
Yuguang Fang received the BS and MS degrees in Mathematics from Qufu Normal University, Qufu, Shandong, China, in 1984 and 1987, respectively,
a Ph.D degree in Systems and Control Engineering from Department of Systems, Control and Industrial Engineering at Case Western
Reserve University, Cleveland, Ohio, in January 1994, and a Ph.D degree in Electrical Engineering from Department of Electrical
and Computer Engineering at Boston University, Massachusetts, in May 1997.
From 1987 to 1988, he held research and teaching position in both Department of Mathematics and the Institute of Automation
at Qufu Normal University. From September 1989 to December 1993, he was a teaching/research assistant in Department of Systems,
Control and Industrial Engineering at Case Western Reserve University, where he held a research associate position from January
1994 to May 1994. He held a post-doctoral position in Department of Electrical and Computer Engineering at Boston University
from June 1994 to August 1995. From September 1995 to May 1997, he was a research assistant in Department of Electrical and
Computer Engineering at Boston University. From June 1997 to July 1998, he was a Visiting Assistant Professor in Department
of Electrical Engineering at the University of Texas at Dallas. From July 1998 to May 2000, he was an Assistant Professor
in the Department of Electrical and Computer Engineering at New Jersey Institute of Technology, Newark, New Jersey. In May
2000, he joined the Department of Electrical and Computer Engineering at University of Florida, Gainesville, Florida, where
he got early promotion to Associate Professor with tenure in August 2003, and to Full Professor in August 2005. His research
interests span many areas including wireless networks, mobile computing, mobile communications, wireless security, automatic
control, and neural networks. He has published over one hundred and fifty (150) papers in refereed professional journals and
conferences. He received the National Science Foundation Faculty Early Career Award in 2001 and the Office of Naval Research
Young Investigator Award in 2002. He also received the 2001 CAST Academic Award. He is listed in Marquis Who’s Who in Science
and Engineering, Who’s Who in America and Who’s Who in World.
Dr. Fang has actively engaged in many professional activities. He is a senior member of the IEEE and a member of the ACM.
He is an Editor for IEEE Transactions on Communications, an Editor for IEEE Transactions on Wireless Communications, an Editor
for IEEE Transactions on Mobile Computing, an Editor for ACM Wireless Networks, and an Editor for IEEE Wireless Communications.
He was an Editor for IEEE Journal on Selected Areas in Communications: Wireless Communications Series, an Area Editor for
ACM Mobile Computing and Communications Review, an Editor for Wiley International Journal on Wireless Communications and Mobile
Computing, and Feature Editor for Scanning the Literature in IEEE Personal Communications. He has also actively involved with
many professional conferences such as ACM MobiCom’02 (Committee Co-Chair for Student Travel Award), MobiCom’01, IEEE INFOCOM’06,
INFOCOM’05 (Vice-Chair for Technical Program Committee), INFOCOM’04, INFOCOM’03, INFOCOM’00, INFOCOM’98, IEEE WCNC’04, WCNC’02,
WCNC’00 (Technical Program Vice-Chair), WCNC’99, IEEE Globecom’04 (Symposium Co-Chair), Globecom’02, and International Conference
on Computer Communications and Networking (IC3N) (Technical Program Vice-Chair). 相似文献
20.
In wireless data networks such as the WAP systems, the cached data may be time-sensitive and strong consistency must be maintained (i.e., the data presented to the user at the WAP handset must be the same as that in the origin server). In this paper, we study the cached data access algorithms in such systems. Two caching algorithms are investigated. In Algorithm I, Pull-Each-Read, whenever a data access occurs, the client always asks the server whether the cached entry in the client is valid or not. In Algorithm II, Callback, the server always invalidates the cached entry in the client whenever an update occurs. Analytic models are proposed to evaluate the performance of these algorithms. Our studies show that Algorithm II outperforms Algorithm I if the data access rate is high and the access pattern is irregular. We also design an adaptive mechanism to effectively switch between the two algorithms to take advantages of both algorithms. We also apply the single-level cached data access algorithms for the multi-level cache hierarchy. Our study indicates that with appropriate arrangement, strongly consistent cached data access for wireless Internet (such as WAP) can be efficiently supported.Yuguang Fang received the B.S. and M.S. degrees in Mathematics from Qufu Normal University, Qufu, Shandong, China, in 1984 and 1987, respectively, a Ph.D degree from Department of Systems, Control and Industrial Engineering at Case Western Reserve University, Cleveland, Ohio, in January 1994, and a Ph.D degree from Department of Electrical and Computer Engineering at Boston University, Massachusetts, in May 1997.From 1987 to 1988, he held research and teaching positions in both Department of Mathematics and the Institute of Automation at Qufu Normal University. He held a post-doctoral position in Department of Electrical and Computer Engineering at Boston University from June 1994 to August 1995. From June 1997 to July 1998, he was a Visiting Assistant Professor in Department of Electrical Engineering at the University of Texas at Dallas. From July 1998 to May 2000, he was an Assistant Professor in the Department of Electrical and Computer Engineering at New Jersey Institute of Technology, Newark, New Jersey. From May 2000 to July 2003, he was an Assistant Professor in the Department of Electrical and Computer Engineering at University of Florida, Gainesville, Florida, where he has been an Associate Professor since August 2003. His research interests span many areas including wireless networks, mobile computing, mobile communications, automatic control, and neural networks. He has published over ninety papers in refereed professional journals and conferences. He received the National Science Foundation Faculty Early Career Development Award in 2001 and the Office of Naval Research Young Investigator Award in 2002. He is listed in Marquis Whos Who in Science and Engineering, Whos Who in America and Whos Who in World.Dr. Fang has actively engaged in many professional activities. He is a senior member of the IEEE and a member of the ACM. He is an Editor for IEEE Transactions on Communications, an Editor for IEEE Transactions on Wireless Communications, an Editor for ACM Wireless Networks, an Area Editor for ACM Mobile Computing and Communications Review, an Associate Editor for Wiley International Journal on Wireless Communications and Mobile Computing, and an Editor for IEEE Wireless Communications. He was an Editor for IEEE Journal on Selected Areas in Communications: Wireless Communications Series and the feature editor for Scanning the Literature in IEEE Wireless Communications (formerly IEEE Personal Communications). He has also actively involved with many professional conferences such as ACM MobiCom02, ACM MobiCom01, IEEE INFOCOM04, INFOCOM03, INFOCOM00, INFOCOM98, IEEE WCNC02, WCNC00 (Technical Program Vice-Chair), WCNC99, and International Conference on Computer Communications and Networking (IC3N98) (Technical Program Vice-Chair).Yi-Bing Lin received his BSEE degree from National Cheng Kung University in 1983, and his Ph.D. degree in Computer Science from the University of Washington in 1990. From 1990 to 1995, he was with the Applied Research Area at Bell Communications Research (Bellcore), Morristown, NJ. In 1995, he was appointed as a professor of Department of Computer Science and Information Engineering (CSIE), National Chiao Tung University (NCTU). In 1996, he was appointed as Deputy Director of Microelectronics and Information Systems Research Center, NCTU. During 1997-1999, he was elected as Chairman of CSIE, NCTU. His current research interests include design and analysis of personal communications services network, mobile computing, distributed simulation, and performance modeling. Dr. Lin has published over 150 journal articles and more than 200 conference papers.Dr. Lin is a senior technical editor of IEEE Network, an editor of IEEE Trans. on Wireless Communications, an associate editor of IEEE Trans. on Vehicular Technology, an associate editor of IEEE Communications Survey and Tutorials, an editor of IEEE Personal Communications Magazine, an editor of Computer Networks, an area editor of ACM Mobile Computing and Communication Review, a columnist of ACM Simulation Digest, an editor of International Journal of Communications Systems, an editor of ACM/Baltzer Wireless Networks, an editor of Computer Simulation Modeling and Analysis, an editor of Journal of Information Science and Engineering, Program Chair for the 8th Workshop on Distributed and Parallel Simulation, General Chair for the 9th Workshop on Distributed and Parallel Simulation. Program Chair for the 2nd International Mobile Computing Conference, Guest Editor for the ACM/Baltzer MONET special issue on Personal Communications, a Guest Editor for IEEE Transactions on Computers special issue on Mobile Computing, a Guest Editor for IEEE Transactions on Computers special issue on Wireless Internet, and a Guest Editor for IEEE Communications Magazine special issue on Active, Programmable, and Mobile Code Networking. Lin is the author of the book Wireless and Mobile Network Architecture (co-author with Imrich Chlamtac; published by John Wiley & Sons). Lin received 1998, 2000 and 2002 Outstanding Research Awards from National Science Council, ROC, and 1998 Outstanding Youth Electrical Engineer Award from CIEE, ROC. He also received the NCTU Outstanding Teaching Award in 2002. Lin is an Adjunct Research Fellow of Academia Sinica, and is Chair Professor of Providence University. Lin serves as consultant of many telecommunications companies including FarEasTone and Chung Hwa Telecom. Lin is an IEEE Fellow. 相似文献