Impact of 4G Wireless Link Configurations on VoIP
Karlstad University, and
IEEE International Symposium on Wireless
Communication Systems 2008, ISWCS2008,
October 21-24, Reykjavik, Iceland. © IEEE
The performance of applications in wireless networks is partly
dependent upon the link configuration.
Link characteristics varies with frame retransmission
persistency, link frame retransmission delay,
adaptive modulation strategies, coding, and more.
The link configuration and channel conditions can
lead to packet loss, delay and delay variations, which
impact different applications in different ways.
A bulk transfer application may tolerate delays to a large
extent, while packet loss is undesirable. On the other hand,
real-time interactive applications are sensitive to delay
and delay variations, but may tolerate packet loss to a
This paper contributes a study of the effect of link frame
retransmission persistency and delay on packet loss and
latency for real-time interactive applications.
The results indicate that a reliable retransmission
mechanism with fast link retransmissions in the
range of 2-8 ms is sufficient to provide an upper
delay bound of 50 ms over the wireless link, which is
well within the delay budget of voice over IP applications.
- Related publications:
SoftCom07-paper, analysing link- and transport layer
ISWCS06-paper describing the emulator methodology.
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