The Wireless IP Project

Mikael Sternad

Radiovetenskap och Kommunikation RVK 02, Stockholm, June 2002.

Outline:

The Swedish Foundation of Strategic Research funds the research program PCC since 1997. More than 40 PhD students, 30 advisors and senior researchers and several industrial partners are and organized in six subprojects at four major Swedish universities. The aim is to work towards personal multimedia communication to all, at the same cost as fixed telephony today.

In particular we study technologies for fourth generation (4G) wireless systems. Here the wireless IP project develops innovative approaches to increase spectrum efficency and througput for packet data over wireless links.

Abstract:

The optimization of resources in wireless packet data systems is challenging when users are mobile with time-varying link quality. Within the SSF PCC program, we have since year 2000 formed the Wireless IP project, which studies such issues.

We perform research towards a flexible packet data system with wide area coverage for mobile users. This system should have performance equivalent to a 100Mbit/s Ethernet connection, with support for Quality of Service and fairness between wireless users. This will require an optimization that involves many levels in the OSI stack.

In the project, we develop and integrate a set of key technologies, consisting of prediction of radio channels, fast link adaptation, scheduling of several packet data streams over time-varying channels, fast resource allocation using antenna arrays and the use of information from lower layers in higher layers, in particular the transport layer.

With these methods, the transmission of packet data to/from mobile users can be radically improved, without expensive use of additional spectral bandwidth.

Related publications:

The downlink of our OFDM target system, with high spectral efficiency.

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.

Some other presentations by Wireless IP at RVK02:

Improved Channel Power Prediction, by using unbiased predictors and advanced regressor noise reduction.

Optimizing adaptive modulation, by taking the power prediction error into account.

Simulating TCP/IP traffic over wireless links in real time.

Source:

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