Quick Data-Retrieving for U-APSD in IEEE802.11e WLAN Networks(<Special Section>Multi-dimensional Mobile Information Networks)

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概要

• 論文の詳細を見る

• The IEEE802.11e is a standard developed by a Task Group E of the IEEE802.11 working group and defines a MAC protocol, which provides EDCA (enhanced distributed channel access) and HCCA (HCF controlled channel access) to support differentiation service over WLAN (wireless LAN). In IEEE802.11e WLAN, real-time application such as VoIP (Voice over IP) can have more chances to access the WM (wireless medium) than non real-time application. In addition to QoS support in WLAN, power consumption is a critical issue when WLAN is used in handheld devices. For power saving in the use of real-time applications like VoIP under EDCA, U-APSD (Unscheduled Automatic Power Save Delivery) was proposed in [2] and [4]. In fact, it can save power consumption and works well when it is used for bi-directional voice connections generated at constant bit rate. However, when it is used for real-time applications like ON-OFF traffic, buffering delay at AP (access point) increases. To reduce the buffering delay, this paper proposes two mechanisms. Simulation results show that they can alleviate buffering delay generated at AP.

• 2006-07-01

著者

• SEZAKI KAORU

  Center for Spatial Information Science, The University of Tokyo

• YASUDA Yasuhiko

  Graduate School of Science and Engineering, Waseda University

• Sezaki Kaoru

  Center For Spatial Information Center The University Of Tokyo

• Yasuda Yasuhiko

  Graduate School Of Science And Engineering Waseda University

• TAKEUCHI Shojiro

  Nokia Research Center Japan

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