PERFORMANCE OF VOIP OVER IEEE 802.11G DSSS-OFDM MODE WITH IEEE 802.11E QOS SUPPORT

Gráinne Hanley, Seán Murphy, Liam Murphy

Abstract

This paper examines, via simulation, the performance of an 802.11e MAC over an 802.11g PHY operating in DSSS-OFDM mode. The DSSS-OFDM scheme provides data rates of up to 54Mb/s as well as interoperability with 802.11b nodes. Due to the widespread use of 802.11b nodes, such interoperability is an important consideration. This paper involves a study of the number of simultaneous bidirectional G.711 VoIP calls that can be supported by such a WLAN. The results show that this mode of operation introduces a very significant overhead. The actual number of calls that can be carried is limited to 12 when using the 24Mb/s data rate and 13 when using either the 36Mb/s or 54Mb/s rates. These results demonstrate the well-known disparity between uplink and downlink performance, with the downlink imposing the limit on the number of calls that can be carried by the system in the cases studied. The results also show that when when a significant amount of lower priority traffic is introduced into the system, it can have a significant impact on VoIP call capacity despite the use of 802.11e.

References

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Paper Citation


in Harvard Style

Hanley G., Murphy S. and Murphy L. (2005). PERFORMANCE OF VOIP OVER IEEE 802.11G DSSS-OFDM MODE WITH IEEE 802.11E QOS SUPPORT . In Proceedings of the Second International Conference on e-Business and Telecommunication Networks - Volume 2: ICETE, ISBN 972-8865-33-3, pages 20-27. DOI: 10.5220/0001416200200027


in Bibtex Style

@conference{icete05,
author={Gráinne Hanley and Seán Murphy and Liam Murphy},
title={PERFORMANCE OF VOIP OVER IEEE 802.11G DSSS-OFDM MODE WITH IEEE 802.11E QOS SUPPORT},
booktitle={Proceedings of the Second International Conference on e-Business and Telecommunication Networks - Volume 2: ICETE,},
year={2005},
pages={20-27},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0001416200200027},
isbn={972-8865-33-3},
}


in EndNote Style

TY - CONF
JO - Proceedings of the Second International Conference on e-Business and Telecommunication Networks - Volume 2: ICETE,
TI - PERFORMANCE OF VOIP OVER IEEE 802.11G DSSS-OFDM MODE WITH IEEE 802.11E QOS SUPPORT
SN - 972-8865-33-3
AU - Hanley G.
AU - Murphy S.
AU - Murphy L.
PY - 2005
SP - 20
EP - 27
DO - 10.5220/0001416200200027