Seungchul Park

DiffServ Quality of Service Support for Multimedia Applications in Broadband Access Networks

QoS support in broadband access network is indispensable because QoS-sensitive realtime multimedia applications such as voice of IP, teleconferencing, IP TV, and audio/video streaming are currently rapidly deployed in broadband access networks. Since broadband access networks are already widely deployed in the world, there are several important consideration factors when supporting DiffServ in broadband access networks. They are backward compatibility with DiffServ-unaware legacy systems, consistency with existing pricing infrastructure, effective QoS support for various applications, and so on. In this paper, we propose several candidate models to support DiffServ QoS in broadband access network environment. The proposed DiffServ models are divided into static and dynamic models. The static DiffServ models include Flat DiffServ providing per-subscriber DiffServ QoS and structured DiffServ providing both per-service and per-subscriber DiffServ QoS. The dynamic DiffServ models include direct DiffServ for peer to peer multimedia applications and indirect DiffServ for applications of service providers

Resource Analysis for Mobile P2P Live Video Streaming

Mobile resources such as smartphones and mobile links are quite different from the fixed resources from the viewpoint of processing power, battery power, and bandwidth. Since the mobile resources are more limited and dynamic than the fixed resources, realtime characteristics of the corresponding resources need to be timely reflected so as to support the quality of service of bandwidth-intensive and high power-consuming P2P(peer-to-peer) live video streaming applications. This paper will concentrate on analyzing the characteristics of mobile resources, mainly focusing on the processing power of smartphone, mobile WiFi bandwidth, and battery power which need to be importantly taken into consideration for mobile P2P live video streaming. Based on the analysis of those mobile resources, how to support quality of service for mobile P2P live video streaming will be also briefly discussed in this paper.

Integrated Session Control for Peer-to-Peer IPTV Services

Todays wide deployment of broadband access networks, high development of personal multimedia processing technologies, and high interests in UCC (user created content)s are pushing the P2P (peer to peer) IPTV era to be opened in near future. The P2P IPTV will create a new paradigm for the Internet services. This paper proposes an integrated session control model for the P2P IPTV services and presents the IPTV session control procedures based on the proposed model. The proposed session control model allows the constituent TPS (triple play services) of the P2P IPTV to be controlled in an integrated way. And it enables the QoS (quality of service) requirements of the P2P IPTV services to be appropriately controlled within a session so that the IPTV traffic can be handled in a differentiated way from the conventional Internet access traffic even in case of network congestion. It also incorporates the multicast control services so as to support effective transmission of video broadcasting streams. The proposed P2P IPTV session control model is designed to be based on the standard SIP (session initiation protocol), IGMP (Internet Group Management Protocol), and COPS (common open policy services) protocol. The session control procedures presented in this paper show how the protocols are integrated to support the required session control services for the P2P IPTV.

Migration toward DiffServ-Enabled Broadband Access Networks

In this paper, we propose several candidate models to support DiffServ QoS for multimedia applications in broadband access network environments, and discuss about smooth migration path from current best-effort access networks to DiffServ-enabled ones. Since broadband access networks are already widely deployed in the world, there are several important consideration factors when supporting DiffServ in broadband access networks. They are backward compatibility with DiffServ-unaware legacy systems, consistency with existing pricing infrastructure, effective QoS support for various applications, and so on. The DiffServ models proposed in this paper are divided into static and dynamic models. The static DiffServ models include Flat DiffServ providing per-subscriber DiffServ QoS and Structured DiffServ providing both per-service and per-subscriber DiffServ QoS. The dynamic DiffServ models include Direct DiffServ for peer to peer multimedia applications and Indirect DiffServ for applications of service providers. Based on the analysis of the pros and cons of the proposed models and the characteristics of current broadband access networks, smooth migration path toward QoS-enabled broadband access networks is also discussed.

A Trustworthy and Interoperable Identity Authentication Sharing Architecture

Identity authentication sharing technologies which allow many service providers to share the result of identity authentication of an identity provider receive high attention as alternatives for current problematic identity authentications in the future Internet environment, owing to their advantages including high usability, cost effectiveness of service providers, and privacy protection. However, in order for the identity authentication sharing technologies to be widely deployed in global Internet scale, the interoperability problem among the different identity authentication sharing protocols and the trustworthiness issue among the participating identity providers, service providers, and users should be resolved in advance. This paper firstly analyzes current status of the protocol interoperability issue and existing trust frameworks for identity authentication sharing. And then, based on the result of analysis, this paper proposes a trustworthy and interoperable identity authentication sharing architecture for future global Internet.

Indirect DiffServ QoS for SIP in Broadband Access Networks

From both technical and economic viewpoints, DiffServ IP QoS architecture is accepted as a more practical solution in Internet world because the other IntServ architecture is more complex and has scalability problem. This paper presents a dynamic DiffServ Model called Indirect DiffServ to support dynamic QoS requirements of SIP-based ASP multimedia applications in broadband access networks. An operational model of QoS-enabled broadband access networks to support dynamic QoS for SIP is firstly proposed. Then the procedures to establish QoS-enabled SIP sessions of ASP applications are presented. The signaling interfaces for dynamic provisioning of DiffServ QoS are designed to be based on COPS and COPS-PR protocols. The inter-layer mapping of QoS attributes between SIP and underlying layers is also discussed in this paper. The underling broadband access networks are assumed to support largely-deployed Metro Ethernet 802.1 D/Q QoS.

COPS-Based Dynamic QoS Support for SIP Applications in DSL Networks

In this paper, several dynamic QoS solutions including Direct DiffServ, Admission-based Direct DiffServ, Indirect DiffServ, and Hybrid DiffServ are proposed to support largely emerging SIP-based P2P(Peer-to-Peer) and ASP(Application Service Provider) multimedia applications in DSL networks, most widely deployed as broadband access networks. The proposed solutions are designed to be based on standard COPS protocol which is simple and service-independent.