Soo-Hong Park

Mobile IPTV: Approaches, Challenges, Standards, and QoS Support

IPTV is defined as multimedia services, such as TV, video, audio, text, graphics, and data, delivered over IP-based networks managed to support quality of service (QoS), quality of experience, security, interactivity, and reliability. Mobile IPTV extends those services to mobile networks. The authors discuss mobile IPTV standardizations status, related approaches in the field, and technical challenges to enhancing mobile IPTV services. Given the critical role of QoS in the technologys widespread adoption, the authors also propose an efficient signaling scheme to support QoS for seamless mobile IPTV services.

Mobile IPTV Expanding the Value of IPTV

IPTV stands for Internet protocol television. In other words, users who have any kinds of IP devices are able to watch television wherever they are. This paper illustrates how IPTV would be adopted to wireless and mobile networks with regards to mobile device called mobile IPTV taking relevant technical issues into consideration. Through mobile IPTV, users can use IPTV services anywhere on earth using IP and while on the move. Currently, ITU-T FG IPTV is at the front head of IPTV standardization. Hence, this paper sums up what is going on in ITU-T FG IPTV in terms of mobile IPTV. This paper helps out the IPTV service provider to prepare as to what technical concerns and issues need to be considered for mobile IPTV services.

TCP Quick-Adjust by Utilizing Explicit Link Characteristic Information

This paper investigates the utilization of explicit bottleneck link characteristic information in order to enhance TCP behaviors. We propose the TCP Quick-Adjust algorithm as an extension of TCP Quick-Start, to allow end nodes to quickly adjust their sending rate for ongoing connections according to the reported bottleneck link bandwidth. Our scheme is considered to be especially suitable to use in a mobile operators controlled network domain, where it is possible to provide a subscribed mobile node with reasonably accurate access link and path information. The link characteristic information is piggybacked in IP mobility signaling in this paper. Using simulations, we show that TCP Quick-Adjust provides good performance in terms of link capacity utilization in the scenarios where vertical handovers can happen between two links with very different characteristics.

QoS-guaranteed Mobile IPTV service in heterogeneous access networks

Internet Protocol Television is defined as a multimedia service delivered over IP-based networks supporting quality of service (QoS), quality of experience (QoE), security, interactivity, and reliability. This service is rapidly expanding to both wireless and mobile networks through mobile devices. This trend demands a seamless IPTV service architecture for those mobile devices in heterogeneous access networks. This is because the convergence of the heterogeneous access networks can resolve their own service-coverage limitations, eliminating dead spots. We first briefly research on the background and trend for the seamless IPTV service for heterogeneous networks. Next we propose a new system architecture taking the relevant technical issues into account. This architecture is mainly composed of three parts, (i) information of network conditions on client, (ii) signaling for communicating between client and server with information of network conditions, and (iii) adaptive streaming based on information of network conditions. The proposed architecture can be deployed on any Internet protocol layers such as application layer, transport layer and network layer. In this paper, we evaluate two cases such as (i) RTSP in application layer and (ii) SCTP in transport layer and compare them through the performance evaluation. The results in the evaluation show that the proposed architecture meets well the requirements of the minimum IPTV service performance recommended by ITU-T international standard for the QoE over heterogeneous access networks.

DNS Configuration in IPv6: Approaches, Analysis, and Deployment Scenarios

IPv6 provides abundant address space and automatic network-parameter configuration. The IETF has proposed three approaches for DNS configuration in IPv6 hosts for recursive DNS server addresses and the DNS search list. The authors analyze these approaches and describe four deployment scenarios in IPv6 wired and wireless networks. They provide guidelines for DNS configuration that IPv6 network administrators and users can apply in their target networks.

A semantic metadata infrastructure for UPnP AV to maximize quality of user experience

Universal Plug and Play Audio Video (UPnP-AV) is a widely accepted standard to enable multimedia device interoperability in home networks. In UPnP-AV, contents are managed and exposed to Control Point and MediaRenderer in MediaServer. Content Directory Service (CDS) in MediaServer is the key component to enable multimedia retrieval and delivery functions by modeling contents in DIDL-Lite and utilizing various metadata. However, the metadata integrating with CDS is not easy when considering interoperability together. More, the metadata model in UPnP AV is a static limited set and lack of semantic capability. To maximize the quality of user experience and performance of implementation, this paper proposes an approach to do the metadata integration based on a comprehensive survey and presents a novel metadata infrastructure for UPnP AV approach to overcome the disadvantages.

System architecture for IPTV seamless service in mobility

IPTV is defined as multimedia services, such as TV, video, audio, text, graphics, and data, delivered over IP-based networks managed to support quality of service (QoS), quality of experience (QoE), security, interactivity, and reliability. Those services are now expanded to mobile and wireless networks. This paper illustrates what technical challenges to be considered for IPTV seamless service in wireless environment. Given the critical role of QoS/QoE in the technologys widespread adoption, this paper also proposes efficient system architecture to support QoS/QoE for IPTV seamless service in wireless environment.

Fast address configuration for WLAN

In this paper, we discuss the current mechanism for IP address configuration in the wireless networks especially 802.11 WLAN and describes its unreasonable time delay and proposes a new mechanism of address configuration which obtains an IP address more quickly. The proposed mechanism provides a reduced message exchange for address configuration in the WLAN over the current 4-way message exchange using DHCP. Performance evaluation and comparison have shown that the proposed mechanism is faster in terms of delay than the existing mechanism including reduced packet loss and stable message exchange when in motion.

OCF: A New Open IoT Consortium

This paper illustrates on the new Internet of ThingsConsortium as OCF stands for Open Connectivity Foundationthat is creating a specification and open source simultaneously tobe broadly adopted in various industries. OCF is a uniquespecification and open source project that delivers just-worksinterconnectivity for developers, manufacturers and end users.

Video in the Web: Technical Challenges and Standardization

This column describes the current status of Web-based video in World Wide Web Consortium (W3C) standardization efforts. The new W3C specifications are designed to facilitate the cross-community integration of media objects, online media captioning, and temporal and spatial media fragments using uniform resource identifiers (URIs) designed to make video a first-class citizen on the Web.