Welcome!
To use the personalized features of this site, please log in or register.
If you have forgotten your username or password, we can help.
|
 |
An Efficient Adaptive Cell Sectoring Technique for Non-Uniform Traffic in DS-CDMA Systems
| |
|
An Efficient Adaptive Cell Sectoring Technique for Non-Uniform Traffic in DS-CDMA Systems
Jihui Zhang1  , Bo Li1 and Jiangchuan Liu2
| (1) |
Department of Computer Science, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong |
| (2) |
School of Computing Science, Simon Fraser University, Burnaby, British Columbia, Canada |
Published online: 30 December 2005
Abstract Cell sectorization has been shown as a promising technique to improve the overall capacity in direct sequence code division
multiple access (DS-CDMA) systems. It has been further demonstrated that the use of adaptive antenna arrays with dynamic cell
sectoring is particularly suitable for non-uniformly distributed users. In this paper, we first re-formulate cell sectoring
into an optimization problem and solve it with dynamic programming algorithm. We next show that this has two major practical
drawbacks: the complexity and oscillation of users between neighboring sectors. We then present an efficient Cluster-based
Sectoring (CS) algorithm for adaptive cell sectorization to overcome these two inefficiencies: Firstly, the computation complexity
of CS algorithm is much lower than that of the optimal sectoring algorithm. In particular under high-density case, the complexity
is bounded and does not depend on the number of users in a cell; Secondly, the CS algorithm maintains the excellent property
of avoiding sector boundaries frequently crossing those users closely located within short angular distances. In addition,
we also investigate the support for multi-rate applications with the proposed CS algorithm. Through extensive experimental
study, we find that the performance of proposed CS scheme obtains comparable performance with greatly reduced complexity when
comparing to the optimal solution.
Keywords adaptive sectorization - CDMA - power control - interference management
Jihui Zhang received her B.S. degree from Computer Science Department at Fudan University, China. She is working toward the Ph.D. degree
in the Computer Science Department at Hong Kong University of Science and Technology. Her research interests include the resource
management in CDMA cellular networks and wireless ad-hoc networks.
Bo Li received his B. Eng. (summa cum laude) and M. Eng. degrees in the Computer Science from Tsinghua University, Beijing in 1987
and 1989, respectively, and the Ph.D. degree in the Electrical and Computer Engineering from University of Massachusetts at
Amherst in 1993. Between 1993 and 1996, he worked on high performance routers and ATM switches in IBM Networking System Division,
Research Triangle Park, North Carolina. Since 1996, he has been with the Department of Computer Science, Hong Kong University
of Science and Technology. He has held an adjunct researcher position at the Microsoft Research Asia (MSRA), Beijing, China.
His research interests are on adaptive video multicast, packet scheduling and dynamic routing in optical networks, resource
management in mobile wireless systems, scheduling and energy efficient routing in ad hoc networks, across layer design for
sensor networks, and content distribution and replication. He has published 70 some journal papers and held several patents
in above areas.
He received the Outstanding Oversea Young Scientist Award from National Natural Science Foundation of China in 2004. He has
been on editorial board for 16 journals and involved in organizing over 40 conferences, esp. IEEE Infocom since 1996. He was
the Co-TPC Chair for IEEE Infocom 2004.
Jiangchuan Liu received the B.Eng degree (cum laude) from Tsinghua University, Beijing, China, in 1999, and the Ph.D. degree from The Hong
Kong University of Science and Technology in 2003, both in computer science.
He is currently an assistant professor in the School of Computing Science, Simon Fraser University, BC, Canada, and was an
assistant professor at The Chinese University of Hong Kong from 2003 to 2004. He was a recipient of Microsoft research fellowship
(2000), a recipient of Hong Kong Young Scientist Award (2003), and a co-inventor of one European patent (granted) and two
US patents (pending). He won first-class honors in several regional and national programming contests.
His research interests include Internet architecture and protocols, media streaming, wireless ad hoc networks, and service
overlay networks. He serves as TPC member for various networking conferences, including IEEE INFOCOM’04 and ‘05. He was TPC
Co-Chair for The First IEEE International Workshop on Multimedia Systems and Networking (WMSN’05), Information System Co-Chair
for IEEE INFOCOM’04, and a guest-editor for ACM/Kluwer Journal of Mobile Networks and Applications (MONET), Special Issue
on Energy Constraints and Lifetime Performance in Wireless Sensor Networks. He is a member of IEEE and IEEE Communications
Society, and an elected member of Sigma Xi.
Fulltext Preview (Small, Large)
 References secured to subscribers.
|
|
|
|
|
|