Nikolaus A. Fikouras

POLICY BASED MOBILE IP HANDOFF DECISION (POLIMAND) USING GENERIC LINK LAYER INFORMATION

There is currently a large variety of heterogeneous wireless access networks and cellular systems available, capable of providing data services. However, such systems require that users remain connected to a same network or terminate all communications when changing the point of attachment during handoff to another network or access technique. This paper describes link layer parameters which can be used to control Mobile IP (MIP) handoffs for seamless mobility. Based on a predefined Generic Link Layer (GLL) Mobile IP handoffs can be forced and can be used by different MIP systems, such as Hierarchical Mobile IP (HMIP) and Fast Mobile IP (FMIP). This paper describes a first implementation of a policy based Mobile IP handoff decision (POLIMAND) which uses link layer parameters for MIP handoff decisions.

Performance comparison of hinted- and advertisement-based movement detection methods for mobile IP hand-offs

Abstract In this study hinted cell switching (HCS) is introduced as a new alternative to the mobile internet protocol (MIP) advertisement-based movement detection methods. It is a method that relies on “hints” generated during subnetwork layer hand-offs for reacting faster to MIP hand-offs. In this study the performance of HCS is compared through the use of simulations against those of advertisement-based movement detection methods, namely, lazy cell switching (LCS) and eager cell switching (ECS). The performance of the latter is determined for a range of advertisement periods. The scenarios investigated involve straight line movement patterns and MIP hand-offs between foreign agents. It is shown that HCS significantly outperforms its advertisement-based counterparts in managing faster movement detection, performing independently of agent advertisement period lengths and providing a small deviation to its performance. Overall, it is demonstrated through simulations of Internet audio streaming that MIP hand-offs with HCS support complete faster with minimum packet loss. Finally, it is identified that ECS performs significantly faster than LCS in the investigated scenario.

Mobility management for an integrated network platform

This paper initially, describes the NOMAD test-bed being set up at ComNets for network integration to integrate various bearer technologies (GSM, GPRS, WLAN, Ethernet). It is based on different Mobile IP versions (IPv4 and IPv6) and software for ad-hoc networking using the AODV (Ad-hoc On Demand Vector routing) protocol. The second section describes the Mobile IP implementations and the improvements achieved in the area of handoff delays. The paper also details the results obtained from the ad-hoc network, to determine the performance of AODV when new nodes are added, and explains future research.