Reducing MAC layer handoff latency in IEEE 802.11 wireless LANs

  • Authors:
  • Sangho Shin;Andrea G. Forte;Anshuman Singh Rawat;Henning Schulzrinne

  • Affiliations:
  • Columbia University;Columbia University;New York University;Columbia University

  • Venue:
  • Proceedings of the second international workshop on Mobility management & wireless access protocols
  • Year:
  • 2004

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Abstract

With the growth of IEEE 802.11-based wireless LANs, VoIP and similar applications are now commonly used over wireless networks. Mobile station performs a handoff whenever it moves out of the range of one access point (AP) and tries to connect to a different one. This takes a few hundred milliseconds, causing interruptions in VoIP sessions. We developed a new handoff procedure which reduces the MAC layer handoff latency, in most cases, to a level where VoIP communication becomes seamless. This new handoff procedure reduces the discovery phase using a selective scanning algorithm and a caching mechanism.