Jungwook Song

One-Time Key Authentication Protocol for PMIPv6

We are now going to the 4G network and in the 4G network environment, there are so many devices connected to the Internet while they move. We have protocol that can support movement of communicating node without any disruption of their connection status named Mobile IP (MIP). But, the major problem of this MIP is too heaviness of the protocol for small mobile nodes. So, IETF now propose Proxy MIP to solve this problem. But, there is no way to authenticate the mobile node in PMIP. In this paper, we propose new authentication protocol for PMIPv6 and show the results of analysis. With our proposed protocol, we can give a lot of securing features to current PMIPv6.

Dynamic Clustering Model for High Service Availability

Current clustering solutions highly depend on pre-configuration by human administrators. However, these clustering solutions are not suitable for the mobile environment because the clustering configuration can be changed as the movement of the server participated in the cluster. Also, when discussing serviceability with the aspect of the quality of services, pre-configured clusters have some defects. If a process of configuration for clusters can be automated, these problems can be solved. With the self-configuration scheme, servers on a network can make clusters dynamically at any time. Any server participating in the cluster can assign its hot standby backup and can also be a backup for another server so that they can provide better services to clients. However, for making the cluster dynamically, the security issue should be considered. For realizing this scheme, the server agent and service description server, called SDS, are designed and implemented. For the security issue, a simple and lightweight authentication approach using DNS server is designed. For watching the state of the overall system, a web-based monitoring tool is also implemented

A Real-time Routing System for Vehicular Ad Hoc Networks

Vehicular Ad Hoc Networks (VANET) are emerging as one of the promising technologies for the future. It can be a specific case of real-time distributed systems. Ad hoc routing can be applied to vehicle-to-vehicle (V2V) communications, but some important points should be considered. Main issue in VANET is its high mobility. Once built routing path can be out of order very quickly and needs to be reconstructed with existing routing protocols. In this paper we propose Road Map Based (RMB) routing protocol for real-time vehicular ad hoc networks – routing algorithm which includes some techniques taken from geographical ad hoc routing. It handles mobility using road map and builds stable routing path on the road segments but not on the nodes. Routing path is done through distributed real-time participants of the network. We propose route discovery, data forwarding and route maintenance mechanisms.

Route Optimization in PMIPv6 Environment

We are now going to the 4G network and in the 4G network environment, there are so many devices connected to the Internet while they are moving. We already have protocol that can support movement of communicating node without any disruption of their connection status named Mobile IP(MIP). But, the major problem of this MIP is too heaviness of the protocol for small mobile nodes. So, IETF finished standardization of Proxy MIP to solve this problem. But, there is no route optimization function in current standard PMIPv6 protocol.In this paper, we propose new route optimization protocol for PMIPv6 and show the results of analysis. With our proposing protocol, we can give a route optimization function to current PMIPv6 with minor changes and we can get many adventages.

Route optimization in NEMO environment with limited prefix delegation mechanism

The 4G network will must be ALL-IP network and IPv6 is destiny. Already IPv6 has extended as Mobile IPv6 for host mobility and Mobile IPv6 is extending for whole network mobility. There are many possible mobile networks, and they would be nested as they change locations. Most serious problem in a nested mobile network is the complexity of routing path of packets, and the complexity grows as the level of nesting increases. In this paper, we propose ‘limited prefix delegation mechanism’, which delivers packets through the optimized path even though mobile networks are nested. We show the effectiveness of our mechanism by solved problems.

Real-time u-LBS system for mobile vehicle in 3G networks

Internet technologies are turning into a fusion of various technologies (architecture, machinery, robotics, traffic, etc). Among these fusion of different technologies, LBS (Location Based Service) is an area where research integrates with every other sectors. The purpose of the LBS system is to provide real-time location information. Such information not only tells the user his own location but also information about the surroundings. This technology and related studies are most commonly dealt with by navigation systems for cars. However, the current LBS service for cars is only service information sent one-way by the server and does not deal with real-time information. However, a problem with the current system is that it does not take full advantage of the LBS system, which is accurate location information, and mobile devices. The goal of this study was to develop an LBS system superior than the current LBS service through actual road tests and to develop a real-time u-LBS system using HSDPA and Wibro Technology of the 3G Network.

Reliable multicast tree construction algorithm

Analysis problem of the existing TMTP and RMTP based on tree in order to efficiently provide reliable multicast, and proposed architecture extended to solve problems grasped. The architecture which is proposed can minimize implosion and exposure, and decreases delay time by tree reconstruction as partial tree reconstruction. We used early OMNet++ simulator, and simulation did the environment which various, and was complicated to demonstrate effectiveness of the architecture which proposed, and provided reliability-based the existing tree.

Reconnection of the Pre-assigning Peers in the Seamless Video Streaming

The main idea of this paper is using a manager server on the top of the tree-based P2P network construction for smartly providing alternative parent peers to reconnect in a case, when the downloading parent is down or crashes. The solution for these issues is considered to use minimum reconnection time for the parent change and solving the problem as lack in alternative peers. This is one of the main demands in the peer-to-peer video streaming system, as seamless streaming is one of the main issues in the P2P network.

Multi-session Method to Reduce Handover Latency and Data Losing in FHMIPv6

Mobile IPv6 has several defects such as overloading of nodes, loss of wireless signals, packet loss, movement problem and so forth. In this paper, we proposed a scheme to deal with F-HMIPv6 (Fast-Hierarchical Mobile IPv6) handover packet loss. With our scheme, we use the Multi-Session technology which connects among NAR, PAR and MAP to reduce the data losing during MN handover time. Data losing can be reduced mostly with our scheme.

Selective handover technique on multihomed mobile network environment

Mobile Networks could have multiple wireless network interfaces due to various wireless technologies provided by many ISPs. Recently, those issues of the multiple connections, Multihomed Mobile Network, were highlighted in IETF NEMO WG. However, considering multiple connections has some tradeoffs between efficiency and fault tolerance, since the network must handle the status of all connections. Moreover, current NEMO basic support architecture does not have functions to handle those multiple connec-tions when it encounters multiple new networks on new location. This article suggests a RA Message selection technique to support efficient Multihomed Mobile Network on NEMO basic support architecture even in case of the nested NEMO environment.