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.
Highlights
Wireless local area network (WLAN) services providing Internet access have recently become ubiquitously available, such as in the home or office, on moving trains, and at transportation platforms and airports
We propose an admission control scheme for Enhanced Distributed Channel Access (EDCA) that employs a TSPEC negotiation, and a traffic control scheme that takes into account the previously admitted flow amount for the purpose of maintaining the quality of service (QoS) of real-time flows
The link rate of the WLAN was fixed to 11 Mbps (IEEE 802.11b std.) to simplify the experiment
Summary
Wireless local area network (WLAN) services providing Internet access have recently become ubiquitously available, such as in the home or office, on moving trains, and at transportation platforms and airports. If the STAs generate heavy traffic beyond what is permitted by the AP, occupying the wireless bandwidth, the QoS of a high-priority flow that has already been accepted may deteriorate For this reason, in addition to an admission decision method, to maintain the communication quality, a traffic control method that takes into account the promised amount based on a TSPEC negotiation is required at the AP. We propose an admission control scheme for EDCA that employs a TSPEC negotiation, and a traffic control scheme that takes into account the previously admitted flow amount for the purpose of maintaining the QoS of real-time flows.
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