Seamless Layer-2 Handoff Using Two Radios in IEEE 802.11 Wireless Networks
A number of algorithms have been proposed to achieve seamless layer-2 handoff. However, none of them eliminated handoff delay completely although some of them improved handoff time significantly, albeit with change to the infrastructure or 802.11 standard. This paper proposes a handoff algorithm which achieves seamless layer-2 handoff using two radios in a mobile node. A radio scan APs while the other radio keep communicating, and thus the authors can eliminate the break during scanning time, which takes more than 90% of the total handoff time.