Toward 4G IP-based Wireless Systems.
Chalmers U. of Technology
Uppsala University and
Chalmers U. of Technology.
Future Telecommunication Conference
Beijing, China, November 2001.
Also presented at the
Wireless World Research Forum Workshop,
Paris, France, December 2001.
The Wireless IP project within the PCC program studies
problems that are crucial in the evolution of UMTS towards high
data rates, as well as in future 4G technologies aimed at
rapidly mobile terminals. The goal is to attain higher
througputs for packet data in particular in downlinks,
without bandwidth expansion and while providing acceptable
quality of service for various classes of traffic.
A packet switched wireless cellular system with wide area
coverage and high throughput is proposed. It is designed to be cost
effective and to provide high spectral efficiency.
performance is achieved by the use of long term channel predictions,
in both time and frequency, scheduling among users, and smart antennas
adaptive modulation and power control. Calculations
of the spectral efficiency of the downlink,
based on reasonable simplifying assumptions,
indicate that a tremendous capacity
can be attained for
moderate numbers of users and terminal antennas.
We also briefly
discuss other means for performance improvements
such as alternatives to standard TCP, interlayer
interaction/communication, and the use of positioning information.
The downlink of this
system proposal, presented at RVK02, June 2002.
The uplink of this
system proposal, presented at WWRF March 2002, Phoenix, Arizona.
Licenciate Thesis by Nilo C. Ericsson
on predictive scheduling combined with adaptive modulation.
Licenciate Thesis by Sorour Falahati, Feb. 2000.
on channel prediction over 1-10 ms horizons.
for the downlink 4G systems similar to the one discussed here
(FTC 2001, Beijing).
An overview of the Wireless IP Project, NRS 01.