Abstract:
This paper reports on the design and
implementation of an IP-centric vertical handoff
decision algorithm and execution scheme between a
wireless wide area network (WWAN) and a wireless
local area network (WLAN) as part of the "IP-centric
Field Workforce Automation". The project aims to
ensure free movement of field workers between
networks while always connected in an IP mode, and
to allow a user to use one device across many types of
networks. We use a fuzzy logic inference system to
process a multi-criteria vertical handoff decision
metrics, and present a mobility management scheme
for IP-based networks using the transport layer
protocol SCTP and the application layer protocol SIP.
The multi-homing capability and DAR extension of
SCTP are applied to provide vertical handoff between
heterogeneous networks. SIP is used to provide
location management when a fixed node initiates an
association with a mobile node.
