Yeonjoon Chung

A Novel QoS Guaranteed Mechanism for Multicast Traffic Controls in the Home Network

The home network has been revitalized due to the emergence of the broadband convergence network and the inter-networked home devices. The home gateway, which can be identified as a major component of the home network, enables to interconnect various home devices to one another as well as the Internet. Also, as the number of multimedia services, which requires high bandwidth and real-time support, increase users demand on the guaranteed quality for the services in the home network. In order to satisfy the user requirements, the Internet service providers (ISPs) have been providing a QoS mechanism for the home network services. However, the ISPs can not guarantee the end-to-end QoS from source to destination due to the misleading fact that the home gateway is recognized as an end terminal in terms of the ISPs viewpoint. Thus the QoS guaranteed mechanism for the remaining path, from the home gateway to the home devices, should be considered within the home network domain. In this paper, we propose a novel mechanism to guarantee the home network QoS for the services based on multicast traffics such as the IPTV or multilateral video conferencing. In order to meet the user requirements on the home network QoS, the proposed mechanism manages resources, classifies the traffic and also executes call admission controls for the service requested in the home network by utilizing the IGMP snooping scheme. Through the experiments of implementing the multicast based IPTV services, we will verify the proposed mechanism

A QoS negotiable service framework for multimedia services connected through subscriber networks

This paper presents a novel QoS negotiable service framework (QNSF) to provide QoS based multi-room application services. The QNSF provides service bandwidth guaranteed services as well as priority based QoS services on home server based Ethernet networks. The QNSF works on Ethernet networks and legacy network devices. Although the QNSF can support priority based QoS services, in order to provide high quality multimedia services from subscriber networks, our scheme supports the service bandwidth guaranteed services because different home applications from multi-rooms compete for limited bandwidth resources. When application session setup begins, our QNSF negotiates a QoS service level of applications through QoS client APIs. Application services can perform any number of dynamic QoS negotiations before the service starts. Thus, the QNSF can provide well adapted QoS providing service to home multimedia applications. The QNSF consists of some functional blocks. A QoS client module defines QoS negotiation APIs for home service applications that require QoS negotiations. QoS proxy, QoS manager, and traffic monitor modules support service based QoS provision functions like dynamic bandwidth negotiation, QoS admission control, service profile based rate control, and adaptive parameter mapping. Packet classifier, class marker, and best effort traffic controller modules enable dynamic input traffic classification and support policy based rate controls. Using dynamic resource reservation and QoS negotiations, our scheme provides efficient QoS guaranteed services for the multimedia traffics from subscribe networks, such as high quality multimedia service. Our prototype implementation shows the feasibility of the QNSF for the provisioning QoS based application services in multi-room home networks

A speculative load adaptive streaming scheme for efficient video delivery

Video on demand services require video broadcast schemes to provide efficient and reliable performance under various client request loads. In this paper, we have developed an efficient request load adaptive broadcast scheme, speculative load adaptive streaming scheme (SLAS), that requires lower service bandwidth than previous approaches, regardless of request rate. We have provided both analysis and simulation to show the performance gain over previous schemes. In this paper, we provide the theoretic upper bound of the continuous segment allocations on channels. We found that the number of allocated segments of the SLAS is close to the theoretic upper bound when compared with other schemes over various numbers of stream channels. Our analysis of client waiting time is almost identical to simulation results about all client requests. By simulation, we compared the required service bandwidth and storage requirements of the SLAS scheme and other schemes and found the SLAS scheme is an efficient broadcast scheme as compared to well known seamless channel transition schemes.

A preemptible resource management scheme on multimedia processing cloud systems

In this paper, we propose the alternative resource allocation scheme to implement VM(virtual machine) manager for multimedia processing applications on the cloud system. The proposed scheme provides a selectively preemptible resource allocation approach to reduce the client service waiting time on the cloud based network systems. For the performance evaluation, various reference schemes are adopted to compare the multidimensional resource allocation problem. In comparison with the reference schemes, the proposed scheme with new constrains shows better performance results in reducing the client waiting time and the waiting queue length of client tasks on the cloud system.

Design and implementation of MBS server for mobile IPTV service in WiMAX networks

This paper describes the design and implementation of MBS (multicast & broadcast service) server for mobile IPTV service in WiMAX networks. Based on interoperability requirements of WiMAX networks, the presented MBS server was implemented for mobile IPTV services and basically provides MBS service announcement and session management functions, dynamic MBS zone management, and MBS data transmission.

3D image transmission technology for mobile IPTV

Recently mobile IPTV service becomes primary service to boost sluggish IT industry. Also 3D image seems to be more prominent in broadcasting service. Therefore 3D image service over mobile IPTV service network will appear as key converging telecommunications and broadcasting service. In order to provide 3D image in wireless access network, its necessary to enhance the capacity of wireless access network approximately 2 times, also operators should maximize the efficiency of radio resources usage ensuring QoS/QoE to users. But its difficulty to enhance the radio capacity of wireless access network. Therefore its necessary to use limited radio resource efficiently. In this paper 3D image transmission technology in mobile IPTV network is suggested to increase an ARPU in communication industry.