Please use this identifier to cite or link to this item:
https://hdl.handle.net/10216/93280
Author(s): | Ricardo Moraes Paulo Portugal Stefano Vitturi Francisco Vasques Pedro F. Souto |
Title: | Real-time communication in IEEE 802.11 networks: Timing analysis and a ring management scheme for the VTP-CSMA architecture |
Issue Date: | 2007 |
Abstract: | 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-of-control 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 real-time 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. Â(c) 2007 IEEE. |
URI: | https://hdl.handle.net/10216/93280 |
Source: | Proceedings - Conference on Local Computer Networks, LCN |
Document Type: | Artigo em Livro de Atas de Conferência Internacional |
Rights: | restrictedAccess |
Appears in Collections: | FEUP - Artigo em Livro de Atas de Conferência Internacional |
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