Seong Gon Choi

The QoE Evaluation Method through the QoS-QoE Correlation Model

Currently, the satisfaction of user is becoming one of the most important topics concerned by the service providers. So we propose the approach method for the objective QoE measurement through the QoS parameters. The measurements and provisioning of the quality of service (QoS) are generally defined in terms of network delivery capacity and resource availability, not in terms of satisfaction to the end-user. The fundamental assumption behind such traditional provisioning is that the measured quality of service is closely related to the quality of experience (QoE) for the end-user. In the paper, we describe the QoS and QoE correlation model, and the QoE evaluation method using QoS parameter in the converged network environment is studied.

A handover framework for seamless service support between wired and wireless networks

This paper proposes low latency handover procedure for seamless connectivity and QoS support between wired (e.g. Ethernet) and wireless (e.g. WLAN, WiBro (802.16-compatible), CDMA) networks by the mobile-assisted and server-initiated handover strategy. It is assumed that the server decides the best target network considering network status and user preferences. In this procedure, a mobile terminal associates with the wireless link decided at the server in advance and receives CoA as well. When handover occurs without the prediction in wired networks, the server performs fast binding update using physical handover trigger through the MIH (media independent handover) function. As a result, a mobile terminal does not need to perform L2 and L3 handover during handover so that this procedure decreases handover latency and loss

RFID Networking Mechanism Using Address Management Agent

The ubiquitous network aims at the communication using IP between entities by the converged network like BcN. RFID is the core technology for comprising ubiquitous network. RFID is also applied to the above features. In RFID network, the communication has to be possible. In this paper, we propose a networking mechanism using address management agent so that networking using IP in RFID. Network mechanism using address management agent receives RFID tag ID of various length and generates IP address. Also, the information of RFID tag ID and IP address is mapped and it stored in address management agent. By using the mapping information stored in the address management agent, RFID is able to make the networking using IP between RFID tags.

Battery life time extension method using selective data reception on smartphone

This paper proposes a battery life time extension method using selective data reception on smartphone according to the battery states of a smartphone. In proposed method, the battery state information of a smartphone is transmitted to the corresponding application server with keep-alive signaling or initial signaling message. The SNS application server determines whether the received data transmits to a smartphone by considering the data types (e.g, picture, video, text, etc.). Accordingly, the battery life time of a smartphone can be extended by avoiding the energy which is caused due to unnecessary data reception. Also, the proposed method can decrease unnecessary bandwidth usage and signaling data.

Hop State Prediction Method Using Distance Differential of RSSI on VANET

The routing protocol toward the reactive protocol of the vehicular ad hoc networks (VANETs) was very much studied but there is no optimized proactive protocol. The proactive protocol still was unable to accomplish an optimization and the routing protocol optimization at VANET is issued. This proposal predicts whether there is the destruction possibility whether by using the RSSI, it finds out a distance and the velocity (first differential of distance) information and the pertinent node can maintain a link or not or not. By using the distance which this proposal can find with RSSI, it finds a receiving-range. Periodic RSSI is confirmed and the transition speed and acceleration can be known as the first the amount of change of this distance, and the second the amount of change. By using this, the link maintenance or not of a vehicle can be predicted If it predicts that the maintenance of link is difficult, it produces with link and new a link is maintained.

P2MP Session Management Scheme using SIP in MPLS-based Next Generation Network

This paper proposes Point-to-MultiPoint session management scheme using Session Initiation Protocol in MPLS-based Next Generation Network service stratum. This scheme is simple and flexible to join, modify, and leave session for NGN multicast service.

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

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.

Implementation of Service Mobility Using Information Sharing Algorithm in Home Network

In this paper, we propose an information sharing algorithm to support service mobility in home network for users convenience. The proposed algorithm creates a text file with information for service request in a personal mobile terminal. The home media terminal supports the service mobility by sharing this information file and re-requesting the service, when it connects to s personal mobile terminal. Moreover, the implementation shows that our proposed algorithm supports service mobility successfully.

Movement Detection Mechanism Using Differential RSSI in Mobile MPLS Network

This paper proposes a new movement detection mechanism using a differential received signal strength indicator (DRSSI) in a mobile multi-protocol label switching (MPLS) network. MPLS can support a mobile service and is the fundamental technology in next generation networks (NGN). A base station (BS) can detect the movement of mobile nodes (MN) by measuring its DRSSI. In our algorithm, a BS can release the bandwidth of MN in handoff when the MN goes to another cell. According to the numerical analysis, our movement detection algorithm using DRSSI can increase the performance of mobile MPLS network by reducing handoff blocking probability