Multichannel Virtual Access Points for Seamless Handoffs in IEEE 802.11 Wireless Networks
Within IEEE 802.11 Wireless Local Area Networks (WLANs), client stations can move freely, but because of the short range of their Access Points (APs), they usually need to reassociate with different APs to continue to communicate. When changing APs, a client station starts a process known as a handoff that can take up to 2 seconds, which is too long for real-time applications such as Voice over IP (VoIP). Various solutions have been proposed to change or improve the client behaviour when doing a handoff. Previously, the authors proposed the idea of Virtual Access Points (VAP) implemented on APs in which a client station changes APs without disrupting its current communication.