Emulation and Validation of a 4G System Proposal.

Stefan Alfredsson, Karlstad University,
Anna Brunström, Karlstand University and
Mikael Sternad , Uppsala University.

Radiovetenskap och Kommunikation , Linköping, Sweden, June 14-16 2005.

Outline:

The Swedish Wireless IP project 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 throughputs for packet data in particular in downlinks, without unnecessary bandwidth expansion and while providing acceptable quality of service for various classes of traffic.

Abstract:

This paper presents a wireless link and network emulator, along with experiments and validation against the "Wire less IP" 4G system proposal from Uppsala University and partners.

In wireless fading downlinks (base to terminals) link-level frames are scheduled and the transmission is adapted on a fast time scale. With fast link adaptation and fast link level retransmission, the fading properties of wireless links can to a large extent be counteracted at the physical and link layers.

The emulator has been used to experimentally investigate the resulting interaction between the transport layer and the link layer. The paper gives an overview of the emulator design, and presents experimental results with three different TCP variants in combination with various link layer characteristics.

Related publications:

Paper 1 at VTC2003, on adaptive modulation, multiuser diversity and channel variability within bins.

Paper 2 at VTC2003, on the OFDM downlink and cell planning for high SIR.

Paper 3 at VTC2003, on OFDM downlink channel estimation and channel prediction.

Paper 4 at VTC2003, on the impact of prediction errors on the adaptive modulation.

An overview of the Wireless IP Project (RVK02)

Source:

Pdf, (281K)