NDLI: A QoS provisioning mechanisms based on effective bandwidth for the polling based WLAN system

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A QoS provisioning mechanisms based on effective bandwidth for the polling based WLAN system

Content Provider	ACM Digital Library
Author	Lee, Kyu-Hwan Lee, Hyun-Jin Kim, Jae-Hyun
Abstract	HCCA has been standardized to provide real-time services with reservation based QoS support using the polling mechanism. To decide whether the service is admitted, the ACU is presented in the specification. The reference scheduler is also specified to allocate wireless resources according to the admission result. However, it is not specified how to collect the QoS information for the service. Furthermore, these mechanisms may operate inefficiently when VBR traffic is generated because these are designed by considering only CBR characteristic. It may cause to degrade the QoS of real-time services generated by VBR. In this paper, we propose three mechanisms to guarantee the QoS of realtime services in the polling based WLAN system. The QoS information for the service is collected using the proposed TS establishment procedure. Then, the effective bandwidth based admission control mechanism decides whether to admit the service according to effective bandwidth. Effective bandwidth is calculated using the collected QoS information. Finally, the token bucket based scheduling mechanism assigns wireless resources depending on the token stored in the bucket. The token bucket size and the token arrival rate are calculated by effective bandwidth. The simulation results show that the proposed mechanisms efficiently transmit the admitted TSs within the delay bound regardless of traffic characteristics. Therefore, the proposed mechanisms can contribute to guarantee the QoS of the real-time services in WLAN.
Starting Page	1
Ending Page	10
Page Count	10
File Format	PDF
ISBN	9781605588933
DOI	10.1145/2108616.2108630
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2010-01-14
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Real-time application Admission control Scheduler Wlan
Content Type	Text
Resource Type	Article

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