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QoS Provision Using Dual RF Modules in Wireless LAN

  • Sang-Hee Park
  • Hye-Soo Kim
  • Chun-Su Park
  • Kyunghun Jang
  • Sung-Jea Ko
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 3295)

Abstract

With the rapid growth of emerging demand and deployment of wireless LAN (WLAN), much of traffic including multimedia traffic is forced to travel over WLAN. Since the legacy IEEE 802.11 standard is unable to provide adequate quality of service (QoS) for multimedia traffic, IEEE 802.11e group developed medium access protocol (MAC) improvements to support QoS sensitive applications and to make more efficient use of the wireless channel. Although this QoS enhancement is great improvement for the legacy standard in terms of capability and efficiency of the protocol, it does not address the method to enhance QoS when a wireless station (STA) changes its associated access point (AP) due to its mobility. Thus, in this paper, we propose an effective QoS provision method that can guarantee QoS requirements in WLAN when the STA performs handoff and is turned on. In order to guarantee QoS requirements, the proposed method uses APs with dual radio frequency (RF) modules. By adding to AP an RF module which can only receive signals (SNIFFER), the AP can eavesdrop channels of its neighboring APs selected by the modified neighbor graph (NG). Experimental results show that the proposed mechanisms can guarantee QoS for multimedia traffic without ping-pong phenomenon by reducing the link layer (L2) handoff delay drastically and distributing the system loads.

Keywords

Medium Access Control Medium Access Control Layer Beacon Frame Medium Access Control Address Medium Access Control Frame 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2004

Authors and Affiliations

  • Sang-Hee Park
    • 1
  • Hye-Soo Kim
    • 1
  • Chun-Su Park
    • 1
  • Kyunghun Jang
    • 1
  • Sung-Jea Ko
    • 1
  1. 1.Department of Electronics EngineeringKorea UniversitySeoulKorea

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