Comunicação Industrial em Tempo Real sobre Redes Locais sem Fio padrão IEEE802.11e (Real-Time Industrial Communication over IEEE802.11e Wireless Local Area Networks)

Raimundo Viégas (rviegasjr@gmail.com)1, Luiz Affonso (luiz.affonso.guedes@gmail.com)2, Francisco Vasques (vasques@fe.up.pt)3, Paulo Portugal (pportuga@fe.up.pt)3, Ricardo Moraes (ricardo.moraes@ufsc.br)4


1Universidade Federal do Pará
2Universidade Federal do Rio Grande do Norte
3Universidade do Porto
4Universidade Federal de Santa Catarina

This paper appears in: Revista IEEE América Latina

Publication Date: April 2012
Volume: 10,   Issue: 3 
ISSN: 1548-0992


Abstract:
This paper proposes a real-time communication scheme for wireless local area network (WLAN) infrastructure. This strategy was called Group Sequential Communication (GSC). The GSC has the main goal to reduce the network overhead due to the Polling, Ack and QoS Null Frames of Hybrid Coordination Function Controlled Channel Access (HCCA) in IEEE 802.11e, because it uses a Virtual Token Passing procedure to priority the real-time communication over WLAN. In order to improve the confiability of the new scheme is presented a fault-tolerant mechanism based on Block-Ack strategy to avoid missing real-time messages. The GSC was implemented in NS2 and simulation results have proved the superior performance of GSC in comparison with HCCA for real-time industrial communications.

Index Terms:
IEEE 802.11e WLAN, Industrial Communication, Real-Time Communication   


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