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Sobre la justicia en las redes IEEE 802.11e: desincronización de su mecanismo de acceso al medio
López Aguilera, M. Elena; Casademont Serra, Jordi; Cotrina Navau, Josep
Universitat Politècnica de Catalunya. Departament d'Enginyeria Telemàtica; Universitat Politècnica de Catalunya. WNG - Grup de xarxes sense fils
Since the advent of the first IEEE 802.11 standard, several papers have proposed means of providing QoS to IEEE 802.11 networks and evaluate various traffic-prioritization mechanisms. Nevertheless, studies on the assignment of AIFS times defined in IEEE 802.11e reveal that the various priority levels work in a synchronized manner. The studies show that, under large loads of high-priority traffic, EDCA starves low-priority frames, which is undesirable. We argue that QoS traffic needs to be prioritized, but users sending best-effort frames should also obtain the expected service. High-priority traffic can also suffer performance degradation when using EDCA because of heavy loads of low-priority frames. Thus, we have proposed a mechanism based on desynchronizing the IEEE 802.11e working procedure. It prevents stations that belong to different priority classes from attempting simultaneous transmission, prioritizes independent collision groups and achieves better short-term and long-term channel access fairness. We have evaluated the proposal based on extensive analytical and simulation results. It prevents the strangulation of low-priority traffic, and, moreover, reduces the degradation of high-priority traffic with the increased presence of low-priority frames.
Peer reviewed
2012-05-11
Àrees temàtiques de la UPC::Enginyeria electrònica i telecomunicacions::Telemàtica i xarxes d’ordinadors::Xarxes d’àrea local
Àrees temàtiques de la UPC::Enginyeria electrònica i telecomunicacions::Telemàtica i xarxes d’ordinadors::Protocols de comunicació
Wireless LANs
IEEE 802.11 (Standard)
IEEE 802.11
MAC
Access protocols
WLAN (Xarxes d'ordinadors)
IEEE 802.11 (Protocol)
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Institute of Electrical and Electronics Engineers
         

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