International Journal of Computer Science & Network Security

International Journal of Computer Science & Network Security (국제컴퓨터통신보호논문지학회)
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Assessing Efficiency of Handoff Techniques for Acquiring Maximum Throughput into WLAN

  • Mohsin Shaikha (Quaid-e-Awam University of Engineering Science and Technology) ;
  • Irfan Tunio (Quaid-e-Awam University of Engineering Science and Technology) ;
  • Baqir Zardari (Quaid-e-Awam University of Engineering Science and Technology) ;
  • Abdul Aziz (Department of Electrical Engineering Sukkur IBA University) ;
  • Ahmed Ali (Department of Electrical Engineering Sukkur IBA University) ;
  • Muhammad Abrar Khan (Department of Computer Science, Iqra National University)
  • Received : 2023.04.05
  • Published : 2023.04.30
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Abstract

When the mobile device moves from the coverage of one access point to the radio coverage of another access point it needs to maintain its connection with the current access point before it successfully discovers the new access point, this process is known as handoff. During handoff the acceptable delay a voice over IP application can bear is of 50ms whereas the delay on medium access control layer is high enough that goes up to 350-500ms. This research provides a suitable methodology on medium access control layer of the IEEE 802.11 network. The medium access control layer comprises of three phases, namely discovery, reauthentication and re-association. The discovery phase on medium access control layer takes up to 90% of the total handoff latency. The objective is to effectively reduce the delay for discovery phase to ensure a seamless handoff. The research proposes a scheme that reduces the handoff latency effectively by scanning channels prior to the actual handoff process starts and scans only the neighboring access points. Further, the proposed scheme enables the mobile device to scan first the channel on which it is currently operating so that the mobile device has to perform minimum number of channel switches. The results show that the mobile device finds out the new potential access point prior to the handoff execution hence the delay during discovery of a new access point is minimized effectively.

Keywords

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