Performance Metrics for IEEE 802.21 Media Independent Handover (MIH) Signaling

Authors:
David Griffith;Richard Rouil;Nada Golmie
Affiliations:
Advanced Network Technologies Division, National Institute of Standards and Technology, Gaithersburg, USA 20899-8920;Advanced Network Technologies Division, National Institute of Standards and Technology, Gaithersburg, USA 20899-8920;Advanced Network Technologies Division, National Institute of Standards and Technology, Gaithersburg, USA 20899-8920
Venue:
Wireless Personal Communications: An International Journal
Year:
2010

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Abstract

The IEEE 802.21 Media Independent Handover (MIH) working group is developing a set of mechanisms to facilitate migration of mobile users between access networks that use different link-layer technologies. Among these are mobility managers that create and process signaling messages to facilitate handovers. The MIH signaling architecture being developed in the Internet Engineering Task Force (IETF) allows any transport layer protocol to carry MIH messages. The IETF has considered using the unreliable but lightweight transport available with the User Datagram Protocol (UDP) as well as the reliable stream-oriented transport with congestion control offered by the Transmission Control Protocol (TCP). In this paper we develop mathematical models that result in expressions for the characteristic function of the time required to complete exchanges of an arbitrary number of MIH signaling messages between a mobile node (MN) and a remote mobility manager (MM). Our models also provide expressions for the average amount of overhead associated with MIH message exchanges due to retransmissions either by the MIH signaling entities or by the transport-layer protocol. In addition, we provide simulation results that confirm the results from the mathematical model and illustrate the effect of varying transport parameters such as the TCP maximum retransmission timeout.