Real-time communication in IEEE 802.11 networks: Timing analysis and a ring management scheme for the VTP-CSMA architecture

• Type: Article in International Conference Proceedings Book
• Date: 2007

Authors

Ricardo Moraes (Author) Other; Paulo Portugal (Author) FEUP; Stefano Vitturi (Author) Other; Francisco Vasques (Author) FEUP; Pedro F. Souto (Author) FEUP

Conference proceedings International

Title: Proceedings - Conference on Local Computer Networks, LCN

Pages: 107-116

32nd IEEE Conference on Local Computer Networks, LCN 2007

Dublin, 15 October 2007 through 18 October 2007

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ISI Web of Knowledge

Scopus - 6 Citations

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Other information

Authenticus ID: P-007-MJV

DOI: 10.1109/LCN.2007.74

Abstract (EN): 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. © 2007 IEEE.

Language: English

Type (Professor's evaluation): Scientific

Notes: O DOI foi corrigido porque o anterior (10.1109/LCN.2007.136) não correspondia a este documento.

No. of pages: 10