Myoung Ju Yu

A New Scheme of Global Mobility Management for Inter-VANETs Handover of Vehicles in V2V/V2I Network Environments

When considering vehicles as communicating mobile nodes, two existing and independently-developed technologies are combined- IP mobility solutions and VANET routing protocols. Particularly, the handover of the vehicle between VANETs is supported by Mobile IP(MIP). MIP has the problems of which are long latency time, triangle routing, and packets loss. So, we propose a new scheme of global mobility management for inter-VANETs handover of vehicles. The proposed scheme supports the fast handover process using L2 triggering and route optimization for packet transmission. The proposed scheme has lower latency time and packet transmission delay than the existing ones.

Agent-based user mobility support mechanism in RFID networking environment

In ubiquitous network environment, mobility is supported among various networks. When a user enjoying the media streaming service changes his attachment point, the service needs to be provided continuously. We propose a mechanism to provide seamless mobility for a user using RFID tag. We build a test bed for user mobility, and confirm that the seamless service can be provided according to the user movement.

Energy Saving Mechanism using sleep mode of processor in home gateway

Home gateway is in always-on state whether traffic flows or not and thus a waste of power is caused in case that any traffic does not flow. This paper proposes HGESM (Home Gateway Energy Saving Mechanism) which reduces energy consumption in home gateway. The proposed HGESM supports energy saving by switching or keeping processor mode according to the type of service (real time or non-real time service). We verify that the proposed HGESM has lower power consumption than the existing scheme.

Performance Comparison of Existing Mobility Management Schemes for NGN

A variety of schemes for mobility are currently studied in ITU-T, 3GPP, IETF, and so on. The ITU-T (SG-19) considers Q.MMF, the 3GPP standardized IMS, the IETF currently uses mobile IP (MIP). For supporting mobility, there are many performance parameters, such as location registration delay, handover delay, packet delivery delay, signaling cost, location update cost, packet delivery cost. However the performance comparison of all existing schemes is not examined as yet. So, this paper investigates and compares the performance of MIPv6, IP2, Q.MMF, IMS to location registration. The time and cost of location registration are associated with the flow of messages between entities according to the procedure. We investigate the variation and performance comparison in the location registration time and cost using the performance metric

New Mechanism for Global Mobility Management Based on MPLS LSP in NGN

This paper proposes a new mobility management (MM) scheme, using Label Switched Path (LSP) of Multi Protocol Label Switching (MPLS) for seamless service in IP-based Next Generation Network. The proposed scheme delivers signaling messages by using L2.5 switching method based on MPLS LSP. So, it can overcome problems from existing schemes, such as PMIP or MIP. We analyze each scheme numerically and verify that the proposed scheme has better performance than others on handover latency, packet loss, location update cost and overall cost.

An Integrated Authentication and Mobility Management Mechanism for Fast Handover in NGN

We propose an integrated authentication and mobility management scheme for fast handover in NGN, and verify that the proposed scheme has lower latency time than the existing one through the integration of authentication and mobility management for handover signaling.

A New Scheme for Unified-Authentication in BcN

There are many authentication mechanisms and authentication parameters. In the BcN (broadband convergence network), there is a strong requirement of unified authentication. Therefore, we propose a new authentication scheme especially for the BcN. The proposed scheme supports the authentication of a mobile node before the mobile node moves to a new access network. For this, an AAA core-broker is positioned in the core network and manages the information for the authentication of the mobile nodes. Consequently, the mobile node can perform fast authentication procedure with the new access network without a help of the local AAA server of the new access network. With the proposed scheme, low latency authentication operations can be achieved.

A Scheme for Improving Handover Feasibility in Convergence Networks

Mobile users needs for seamless services are currently increasing. Users change their location by moving and use services. At this time, if a new target cell does not have sufficient resource for the service, the service can not be continuous. For solving this problem, we propose a seamless service support scheme to improve service continuity. The proposed scheme increases handover feasibility by using classified service with several classes. As analytical result, we show that the performance of the handover blocking probability in the proposed scheme is better than that of the existing scheme.

Performance Comparison on Location Management Schemes

This paper investigates and compares the performance of MIPv6, IP2 and Q.MMF with respect to the time and cost in the case of location registration. We analyze the performance using the performance metric and an M/M/l queueing system. Numerical results show that the performance of Q.MMF Casel is better than that of others.

An improved MPLS-MOB for reducing packet loss in NGN

We propose an improved MPLS-MOB scheme for seamless service in Next Generation Network (NGN). The existing MPLS-MOB scheme delivers signaling messages by using L2.5 switching via MPLS LSP for low handover latency. However, the MPLS-MOB scheme does not consider a solution to prevent packet loss during handover. The proposed scheme reduces packet loss by adding some process before and after connecting to new location on the existing MPLS-MOB. So, it can overcome problems from existing schemes, such as MIPv6, FMIPv6 and the existing MPLS-MOB. We analyze each scheme numerically and verify that the proposed scheme has better performance than others on handover latency and packet loss.