(MIPv6) is a protocol developed as a subset of Internet Protocol
version 6 (IPv6) to support mobile connections. MIPv6 is an
update of the IETF (Internet Engineering Task Force) Mobile IP
standard (RFC 2002) designed to authenticate mobile devices
(known as mobile nodes) using IPv6 addresses. In traditional IP
routing, IP addresses represent a topology. Routing mechanisms
rely on the assumption that each network node will always have
the same point of attachment to the Internet, and that each
node's IP address identifies the network link where it is
connected. In this routing scheme, if you disconnect a mobile
device from the Internet and want to reconnect through a
different network, you have to configure the device with a new
IP address, and the appropriate netmask and default router.
Otherwise, routing protocols have no means of delivering
datagrams (packets), because the device's network address
doesn't contain the necessary information about the node's
network point of attachment to the Internet. MIPv6 allows a
mobile node to transparently maintain connections while moving
from one subnet to another. Each device is identified by its
home address although it may be connecting to through another
network. When connecting through a foreign network, a mobile
device sends its location information to a home agent, which
intercepts packets intended for the device and tunnels them to
the current location.
Concerning MIPv6 protocol, an MN can determine its network layer
movement by using Router Discovery and Neighbor Unreachability
Detection. After a MN makes a new Care of Address (CoA), it must
check its uniqueness by DAD.
The delay of network layer-based movement detection,
non-optimized time sequencing of handover procedures and latency
in configuring a new care of address are inevitable in Mobile
IPv6. These delays will cause packet disruption and increase
network load. But Fast handovers for Mobile IPv6 could be
reduced for real time applications and throughput sensitive
application by fast movement detection scheme with L2 trigger
event. Actually, the handover latency could be too long
regarding real time multimedia applications.
of the major areas of research taking place at the LIST lab deals
with the solutions to reduce handover latency in MIPv6 networks.
propose an Efficient Movement Detection procedure which quickly
sends Router Solicitation (RS) and Router Advertisement (RA)
message without Random Delay using Stored RA messages with
unicast. Doing so quickly determines the uniqueness of a new CoA
using the modified Neighbor cache of an access router. In
particular, we focus on the delay optimization of movement
detection and DAD for fast handover in Mobile IPv6 Networks. In
movement detection, RS delays the transmission for a random
amount of time (Random delay for RS, RD_RS) . This time
serves to alleviate congestion when many hosts start up on a
link at the same time, which might happen after recovery from a
power failure. Also, RA must be delayed by a random amount time
(Random delay for RA, RD_RA). This time is required to prevent
multiple nodes from transmitting at exactly the same time, and
to prevent long-range periodic transmissions from synchronizing
with each other. These random delays are the second largest
delay after DAD in MIPv6 Network-Layer handovers. In DAD
procedure, after generation of a CoA, an MN should perform DAD
for testing the new CoA’s uniqueness within the new link. The
proposed scheme enhances processing time of DAD using lookup
1 shows the standard Mobile IPv6 Architecture.
1. Standard MIPv6 Environment
2 shows the standard Mobile IPv6 handover procedure which cause
long time handover delay.
2. Standard MIPv6 Handover Procedure
3. Enhanced MIPv6 with Fast Movement Detection and DAD
 Byungjoo Park,
In Huh, Haniph A. Latchman, “An Approach to Efficient
and Reliable Media Streaming Scheme in Mobile IPv6
IEEE International Symposium on Broadband Multimedia
Systems and Broadcasting
April 6-7, 2006.
 Byungjoo Park,
Sunguk Lee, Haniph A. Latchman, “Performance Analysis of
Enhanced-Mobile IPv6 with Fast Handover over End-to-End
Proc. the IEEE
Communications and Networking Conference (WCNC’06),
April 3-6, 2006.
 Byungjoo Park,
Haniph A. Latchman, “Fast Handover Scheme Based on
Enhanced Access Point (EAP) for Mobile IPv6”,
IEEE International Conference on Advanced Communication
Technology, Feb. 20-22, 2006, pp. 759-763.