PCC Wireless IP - Optimizing Throughput and QoS over Fading Channels.

Mikael Sternad, Arne Svensson, Anders Ahlén and Tony Ottosson

Nordic Radio Symposium 2001 (NRS 01) , Nynäshamn, Sweden, April 3-5 2001.

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 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.

Related publications:

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.

Source:

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