In a Code Division Multiple Access (CDMA) network, multiple Mobile Hosts (MHs) can simultaneously transmit over the wireless
channel by using different codes. To assure an acceptable Quality of Service (QoS) for all MHs' flows, the network usually
tunes the transmit powers of all MHs to achieve a certain level of signal strength as compared to the noise and the interference
(SINR) for each MH. The traditional assumption in power control schemes is that the SINR requirement is statically determined
for each MH's flow.
In contrast, in this paper, we propose a scheme that dynamically adapts the SINR requirements of MH's flow based on its QoS
requirements and the conditions of the wireless channel between the MHs and the base station. As a result of this adaptation,
we show that network-level QoS measures such as fraction of packets meeting their delay requirements and energy consumed per
packet transmission are significantly better than in a scheme that statically fixes the SINR requirements. We show that the
adaptation approach works well for the Matched Filter (MF) and the Minimum Mean Squared Error (MMSE) receivers.
Our scheme uses a simple table-driven approach for optimally selecting the target SINR requirement for each MH at run time.
The entries in the table are computed off-line using a dynamic programming algorithm with the objective of maximizing a profit
function that balances the need for meeting the network-level QoS requirements and the cost of using a particular target SINR
for a given transmission.
Moncef Elaoud (M'97) received his B.Sc. (1988) his M.Sc. (1990) and his Ph.D. (2000) in electrical an computer engineering from the University
of Wisconsin-Madison. He is currently a senior research Scientist at Telcordia Technologies' Applied Research organization.
His main research interests are in the areas of quality of service, self-forming and self healing networks, auto-configuration,
and mobility management in wireless and ad-hoc networks.
Bechir Hamdaoui received the B.S. degrees in both electrical and mechanical engineering, and the M.S. degree in mechanical engineering from
the National School of Engineering in Tunis (BAC+6+DEA, ENIT), Tunisia, in 1997 and 1998, respectively. He also received the
M.S. degree in electrical and computer engineering from the University of Wiconsin, Madison, WI, in 2002, where he is currently
working toward the Ph.D. degree. From 1998 to 1999, he worked as a quality control and planning engineer on power generation
plant project under the supervision of FIAT Avio. His research focuses on various aspects in the area of computer networking
including mobile networks, wireless communication systems, and ad hoc networks.
Parameswaran Ramanathan received the B. Tech degree from the Indian Institute of Technology, Bombay, India, in 1984, and the M. S. E. and Ph. D.
degrees from the University of Michigan, Ann Arbor, in 1986 and 1989, respectively. Since 1989, Dr. Ramanathan has been faculty
member in the Department of Electrical & Computer Engineering, University of Wisconsin, Madison, where is presently a Full
Professor. He leads research projects in the areas of sensor networks and next generation cellular technology. In 1997–98,
he took a sabbatical leave to visit research groups at AT&T Laboratories and Telcordia Technologies.
Dr. Ramanathan's research interests include wireless and wireline networking, real-time systems, fault-tolerant computing,
and distributed systems. He is presently an Associate Editor for IEEE Transactions on Mobile Computing and Elsevier AdHoc
Networks Journal. He served as an Associate Editor for IEEE Transactions on Parallel and Distributed Computing from 1996–1999.
He has also served on program committees of conferences such as Mobicom, Mobihoc, International Conferences on Distributed
Systems and Networks, Distributed Computing Systems, Fault-tolerant Computing Symposium, Real-time Systems Symposium, Conference
on Local Computer Networks, and International Conference on Engineering Complex Computer Systems. He was the Finance and Registration
Chair for the 1999 Fault-tolerant Computing Symposium. He was the program chairman of the Workshop on Architectures for Real-time
Applications, 1994 and the program vice-chair for the International Workshop on Parallel and Distributed Real-time Systems,
1996. He is a member of Association of Computing Machinery and a senior member of IEEE.
相似文献