| Abstract | In wireless network, when a handoff occurs, a network routing scheme is needed to
support the handoff. Mobile IP (MIP) is developed to provide terminal mobility without
changing IP addresses. The Session Initiation Protocol (SIP) is an application-layer protocol
used for establishing and terminating multimedia sessions. SIP already supports personal
mobility, and in order to support terminal mobility, minor changes need to be done. In this
thesis, the performances of Voice over Internet Protocol (VoIP) with terminal mobility
supported by MIP and SIP are comparatively studied. The three network topologies to be
considered include: the neighbor, the star, and the mesh. We also trace the various mobility
behaviors, which depend on the location of the Mobile Host (MH), Correspondent Host (CH)
and home network of MH. The performance of VoIP are determined by the measured
parameters of mean end-to-end delay, handoff delay, packet loss per handoff operation, and
the percentage of packet loss during handoff operation.
The investigation results show that the triangular routing and encapsulation
introduced by MIP have a strong effect on the traffic of network. SIP generally performs
better than MIP. However there exists a case where MIP outperforms SIP. This happens
when the location of the MH is far from its CH and induces a handoff to its nearby home
network. As a results, the handofftime of SIP is higher than that ofMIP.
The performance of MIP and SIP mobility depends on the location of the MH, CH,
and home network of MH. When a MH moves near to its home network, MIP performs
better than in the case where a MH randomly moves. When a MH moves far from its
correspondent host, the performance of SIP is inferior to the case where a MH randomly
moves. The various mobility behaviors obtained from different location of the MH, CH, and
home network of MH are studied. Network topology also plays an important role on the
performance of VoIP for each mobility behavior. The type of network topology serves as an
important factor in determining the distance of wired link between the MH, CH and the home
network of MH. Under the neighbor topology, when a MH moves in its neighboring cell of
its home network, the distance of wired link between the location of MH and the home
network is shorter than in the case where a MH moves far from its home network. However
no such difference is observed under the other two topologies. |