PCC Wireless IP - Optimizing Throughput
and QoS over Fading Channels.
Nordic Radio Symposium 2001 (NRS 01) ,
Nynäshamn, Sweden, April 3-5 2001.
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.
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.
Two main techniques are
investigated to accomplish this. First, the instantaneous channel
quality of fast fading channels is measured and predicted for each user.
These predictions are utilized
in fast link adaptation and fast scheduling of different users
who share a channel. Second, information is transferred
between protocol layers to reduce inefficiencies. In particular,
we study improvements of TCP that are aware of the state of
wireless links, and that may be introduced in split connections.
We also investigate the use in higher layers
of soft information from the decoding
in the link layer, possibly to create wireless-aware applications
that use combined source and channel decoding.
Presentation of the Wireless IP Project,
the following year, at RKV02.
Scheduling as an optimization problem,
presented at PCC/NRS01.
Paper on Hybrid type-II ARQ/AMS and scheduling
using channel prediction on fading channels, at PCC/NRS01.
Paper on reliable transport protocols
over wireless links, at PCC/NRS01.