Admission and Traffic Control Schemes Suitable for QoS Applications in WLAN Systems

Takefumi Hiraguri, Takayuki Kimura, Toshiyuki Ogawa, Hiroshi Takase, Akira Kishida, Kentaro Nishimori

Doctoral Program in Graduate School of Electrical Engineering, Nippon Institute of Technology, 4-1 Gakuendai, Miyashiro, Minami-Saitama, Saitama, Japan.
Graduate School of Science & Technology, Niigata University, 8010 Igarashi 2-nocho, Nishi-ku, Niigata, Japan.
Nippon Institute of Technology, 4-1 Gakuendai, Miyashiro, Minami-Saitama, Saitama, Japan.
NTT Access Network Service Systems Laboratories, 1-1 Hikarinooka, Yokosuka, Kanagawa, Japan.

DOI: 10.4236/ajor.2012.23046                

Abstract

This paper proposes the use of admission and traffic control schemes for real-time applications. The admission control scheme determines the admission of high-priority real-time applications such as voice and video streams in terms of their bandwidth utilization time (medium time), whereas the traffic control scheme maintains the communication quality of applications permitted admission by restricting other traffic. Owing to the use of contention-based access, a conventional scheme without admission control will degrade the communication quality when the number of terminals using high-priority applications increases. Moreover, only the capabilities (i.e., frame and sequence procedures) of admission control are defined in the IEEE 802.11e standard; the detailed usage in terms of the application characteristics is not specified, and it may be difficult to achieve a sufficient level of quality of service (QoS). The proposed schemes achieve the optimum QoS for actual services. The software used in the proposed schemes was implemented into hardware at the access point, and was evaluated experimentally. Based on the evaluation results, excellent performances with high QoS applications were obtained.

Keywords

QoS; IEEE 802.11; Admission Control; Traffic Control; EDCA

Conflicts of Interest

The authors declare no conflicts of interest.

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