Real Time Simulations of Wireless IP communications.
Nilo Casimiro Ericsson
Radiovetenskap och Kommunikation RVK 02,
Stockholm, June 2002.
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.
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.
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.
by Nilo Casimiro Ericsson, Oct. 2004.
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