Real Time Simulations of Wireless IP communications.

Anna Ewerlid and Nilo Casimiro Ericsson

Radiovetenskap och Kommunikation RVK 02, Stockholm, June 2002.

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:

We describe an ongoing effort to create a platform for realistic realtime simulations of wireless communication systems. The purpose of the work is primarily to evaluate the performance of existing and new approaches to provide wide area mobile and wireless Internet.

The new approaches comprise of enhancements to transport protocols, and spectrally efficient allocation of the wireless resources. The simulation tool is, just like the communication pro-tocol stack, divided into several separate layers, each providing its functionality. It is also distributed over several computers that communicate over an ethernet.

The main contribution, that makes the real-time simulation possible, is provided by very heavy calculations and extensive off-line simulations of the lower layers in the communication stack. Through these simulations we obtain large tables of probabilities that are accessed on-line by the simulator running the higher layers.

Related publications:

NRS 01 paper on Hybrid type-II ARQ/AMS and scheduling using channel prediction on fading channels.

NRS 01 paper on TCP issues over wireless links

Wireless IP System Proposal, RVK02.

Ph.D. Thesis by Nilo Casimiro Ericsson, Oct. 2004.

Source:

Pdf, 223K