FAMH: Fast inter-subnet multicast handoff method for IEEE 802.11 WLANs

Sang Seon Byun, Chuck Yoo

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


When a mobile node that subscribes to one or more multicast groups moves to another subnet, it is essential to provide a network level multicast handoff mechanism. Previous multicast handoff schemes are based on Mobile IP. However it is known that the Mobile IP is not adequate to interactive multimedia applications such as voice over IP or video conferencing due to its large handoff delay. Additionally, few researches have paid attentions on multicast handoff in infrastructure-mode WLAN environment. This paper proposes a fast inter-subnet multicast handoff method in Mobile IP based infrastructure-mode IEEE 802.11 WLAN environment. We introduce a dedicated Multicast Access Point (MAP) that works with an access points specified in standard IEEE 802.11 WLAN in order to alleviate disruption of receiving multicast datagram. Unlike previous research, our scheme does not modify Mobile IP specifications. MAP detects the completion of link-layer handoff, sends unsolicited IGMP Membership report to its local router on behalf of the mobile station and performs unicast tunneling. We evaluate the proposed method using ns-2 simulation. The simulation result shows that the proposed method can reduce the disruption period due to inter-subnet multicast handoff to about 1/12 and the packet loss rate can be reduced to about 1/4 over 20-size multicast group compared with the standard Mobile IP based IEEE 802.11 WLAN.

Original languageEnglish
Pages (from-to)3365-3374
Number of pages10
JournalIEICE Transactions on Communications
Issue number8
Publication statusPublished - 2005 Aug


  • Fast handoff
  • IEEE 802.11
  • Mobile IP
  • Mobile multicast
  • Wireless multicast

ASJC Scopus subject areas

  • Software
  • Computer Networks and Communications
  • Electrical and Electronic Engineering


Dive into the research topics of 'FAMH: Fast inter-subnet multicast handoff method for IEEE 802.11 WLANs'. Together they form a unique fingerprint.

Cite this