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Published Articles >> Table of Contents >> Abstract
32nd IEEE Conference on Local Computer Networks (LCN 2007)
pp. 107-116
Real-Time Communication in IEEE 802.11 Networks: Timing Analysis and a Ring Management Scheme for the VTP-CSMA Architecture
Ricardo Moraes, University of Porto, Portugal
Paulo Portugal, University of Porto, Portugal
Stefano Vitturi, University of Padova, Italy
Francisco Vasques, University of Porto, Portugal
Pedro F. Souto, University of Porto, Portugal
Full Article Text:
 
DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/LCN.2007.136
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| Abstract |
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Keeping up with the timing constraints of real-time traffic
in wireless environments is a hard task. One of the reasons
is that the real-time stations have to share the same communication
medium with stations that are out of the sphere-ofcontrol
of the real-time architecture. That is, with stations
that generate timing unconstrained traffic. The VTP-CSMA
architecture targets this problem in IEEE 802.11 wireless
networks. It is based on a Virtual Token Passing procedure
(VTP) that circulates a virtual token among real-time stations,
enabling the coexistence of real-time and non realtime
stations in a shared communication environment. The
worst-case timing analysis of the VTP-CSMA mechanism
shows that the token rotation time is upper-bounded, even
when the communication medium is shared with timing unconstrained
stations. Additionally, the simulation analysis
shows that the token rotation mechanism behaves adequately,
even in the presence of error-prone communication
channels. Therefore, the VTP-CSMA architecture enables
the support of real-time communication in shared communication
environments, without the need to control the timing
behavior of every communicating device. A ring management
procedure for the VTP-CSMA architecture is also proposed,
allowing real-time stations to adequately join/leave
the virtual ring. This ring management procedure is mandatory
for dynamic operating scenarios, such as those found
in VoIP applications.
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 Additional Information
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Citation:
Ricardo Moraes, Paulo Portugal, Stefano Vitturi, Francisco Vasques, Pedro F. Souto,
"Real-Time Communication in IEEE 802.11 Networks: Timing Analysis and a Ring Management Scheme for the VTP-CSMA Architecture,"
lcn,
pp. 107-116,
32nd IEEE Conference on Local Computer Networks (LCN 2007),
2007
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