Transport Protocol Performance over 4G Links:
Emulator Methodology and Results.
Karlstad University, and
Int. Symposium on Wireless Communication Systems ISWCS,
Valencia, Spain, Sept. 5-8 2006.
This paper presents a wireless link and network emulator for
the Wireless 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 physical/link layer in such a downlink.
The paper introduces the Wireless IP system, describes
the emulator design and implementation, and presents
experimental results with TCP in combination with
various physical/link layer parameters.
The impact of link layer ARQ persistency,
adaptive modulation, prediction errors and
simple scheduling are all considered.
- Related publications:
PhD Thesis by Nilo Casimiro Ericsson.
SoftCom07-paper, analysing link- and transport layer
ISWCS-08-paper describing performance for
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