Toward 4G IP-based Wireless Systems.

Tony Ottosson, Chalmers U. of Technology
Anders Ahlén, Uppsala University
Anna Brunström, Karlstad University
Mikael Sternad, Uppsala University and
Arne Svensson, Chalmers U. of Technology.

Future Telecommunication Conference Beijing, China, November 2001.

Also presented at the Wireless World Research Forum Workshop, Paris, France, December 2001.

Outline:

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.

Abstract:

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.

The high performance is achieved by the use of long term channel predictions, in both time and frequency, scheduling among users, and smart antennas combined with 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.

Related publications:

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 (June 2001), on predictive scheduling combined with adaptive modulation.

Licenciate Thesis by Sorour Falahati, Feb. 2000.

VTC01spring-paper on channel prediction over 1-10 ms horizons.

Scheduling and adaptive transmission for the downlink 4G systems similar to the one discussed here (FTC 2001, Beijing).

An overview of the Wireless IP Project, NRS 01.