• Proceedings of the Korea Information Processing Society Conference
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• 2010.11a
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• pp.948-951
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• 2010

네트워크 기술의 발전과 하드웨어의 발전으로 인해 많은 네트워크 응용 서비스 기술이 등장하고 있다. 이 중에서도 IPTV 와 같은 멀티미디어 스트리밍 기술은 그 수요에 의해 기하급수적으로 증가하고 있는 실정이다. 만족할만한 IPTV 서비스를 제공해 주기 위해서는 안정적인 네트워크 자원의 확보가 필수적이다. 이에 본 논문에서는 IPTV 서비스를 위한 네트워크 자원 확보를 위해 기존의 AVB 기술을 기반으로 하여 안정적인 QoS 를 보장하는 방법을 제안한다. IPTV 서비스에 해당하는 각 트래픽에 대한 대역폭 예약 방법과, 대역폭 예약 실패 상황에 대해 처리할 수 있는 개선된 MSRP를 이용하여 IPTV 서비스의 QoS 를 보장하고자 한다. 본 논문의 성능 평가를 위해 OPNET 을 이용하여 기존 방법들에 대한 시간동기의 정확성, 트래픽의 단대단지연, 네트워크 자원 활용률을 측정하였다.

• Journal of information and communication convergence engineering
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• v.8 no.3
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• pp.295-300
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• 2010

Recent researches of network structure are moving to high-level networks because there are already many research results of low-level network. Especially, current network services has been changed to the multimedia service using multicast routing such as IPTV(Internet Protocol Television) service. And then previous multicast services were provider oriented. So previous multicast structures were organized server/client model. But future multicast services will make user oriented services. Therefore there will be many service providers in the future. At this point, we study P2P network for supporting multi provider. So we research load balancing and contents lookup protocols in P2P network. In this paper, we propose network protocol and system based on super peer P2P for load balancing and efficiently service search. And we considered mobile environment for mobile IPTV.

• TTA Journal
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• s.107
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• pp.54-58
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• 2006

DMB로 대표되는 국내 이동형 TV가 이제는 인터넷과 어우러져 IPTV로 빠르게 진화하고 있다. 국내에서는 이미 관련 업체를 중심으로 많은 개발과 서비스가 개발되고 있는 상황에서 금년 초 ITU-T에서의 IPTV Focus Group의 활동은 그 움직임을 더욱 가속화 시켰다. 본 기고문에서는 현재의 연구 중심인 고정형 IPTV 최근 현황과 이와 관련된 다양한 기술적 이슈를 동시에 살펴본다.

• The KIPS Transactions:PartC
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• v.17C no.3
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• pp.299-306
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• 2010

IPTV and VoIP services are considered as killer applications over Mobile WiMAX network, which provideshigh mobility and data rate. Among those which affect the quality of voice in those services, the jitter buffer or playout buffer can compensate the poor voice quality caused by the packet drop due to frequent route change or differences among routes between service endpoints. In this paper, we analyze the correlation between the sleep interval length and jitter buffer size in order to guarantee a predefined level of voice quality. For this purpose, we present an end-to-end delay model considering additional delay incurred by the WiMAX PSC-II sleep mode and a VoIP service quality requirement based on the delay constraints. Through extensive simulation experiments, we also show that the increase of jitter buffer size may degrade the voice quality since it can introduce additional packet drop in the jitter buffer under WiMAX power saving mode.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.2B
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• pp.302-312
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• 2010

Internet Protocol Television (IPTV) service is the convergence service of the telecommunication and broadcasting that provides various bidirectional multimedia contents by IPTV service subscribe's request through the high-speed internet. However, the proposed technologies current do not guarantee the security such as authentication between Set-Top-Box (STB) and the user mobile devices available IPTV service at home domain, and authentication of mobile user device at out of door. This paper proposes the authentication protocol for distributing content securely from STB to the users' mobile devices at home domain and authentication for network access and IPTV service access when the user's mobile device is moved out of the house. The proposed scheme using the proxy signature enables to distribute and protect securely the contents protected through an underlying Conditional Access System (CAS) without re-encrypting then that the existing scheme should employ. Then this protocol supports the authentication scheme to get service access authentication based on network access authentication using the signature, which the STB issued on behalf of the trust authority of IPTV service provider. Also the proposed authentication protocol reduces the total communication overhead and computation time comparing to the other authentication protocol.

• ETRI Journal
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• v.35 no.2
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• pp.234-244
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• 2013

Internet protocol television (IPTV) service depends on the network quality of service (QoS) and bandwidth of the broadband service provider. IEEE 802.16j mobile multihop relay Worldwide Interoperability for Microwave Access networks have the opportunity to offer high bandwidth capacity by introducing relay stations. However, to actually satisfy QoS requirements for offering IPTV services (HDTV, SDTV, Web TV, and mobile TV) for heterogeneous users' requests, providers must use a video server for each IPTV service type, which increases the network load, especially bandwidth consumption and forwarding time. In this paper, we present a solution for forwarding IPTV video streaming to diverse subscribers via an 802.16j broadband wireless access network. In particular, we propose a new multicast tree construction and aggregation mechanism based on the unique property of prime numbers. Performance evaluation results show that the proposed scheme reduces both bandwidth consumption and forwarding time.

• Journal of Digital Convergence
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• v.14 no.2
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• pp.389-396
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• 2016

This study analyzes factors that influence use diversity or usage of mobile video services. This study conducts multiple regression analysis to draw the major factors that affect use diversity or usage of mobile video services. The major findings of this study are as follows. First, IPTV membership status, DMB watching status, and TV contents broadcasting status affect the use diversity of mobile video services. Second, TV contents broadcasting status and video streaming quality affect the usage of mobile video services. This study provides some implications that TV contents broadcasting is a core element in mobile video services. The future research is discussed.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2010.05a
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• pp.609-611
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• 2010

IPTV(Internet Protocol Television)is the point in commercial and broadcast content from the numerous channels that are growing exponentially, Many people with mobile devices anywhere, anytime you want to use IPTV, demand will increase. Numerous channels for collecting information about EPG (Electronic Program Guide) service, IP (Internet Protoco) communications using a fast search of content for broadcast EPG is time to take advantage of the service. Using the current wired network, the Android-based IPTV services to take advantage of the EPG in the mobile environment to provide an environment being studied, and Country of the European digital broadcast standard DVB-MHP standard is followed by subsequent research and development of the EPG service is required. In this study, using the existing wired network, IPTV EPG service information of the channel in a mobile environment user-friendly as possible by providing channels for EPG service information to users quickly and easily search for content to provide an environment and Android-based mobile IPTV environment to take advantage of the EPG service channels of broadcast channels with in the EPG service for users to gather information retrieval system is proposed.

• Review of KIISC
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• v.20 no.2
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• pp.65-77
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• 2010

본격적인 IPTV 서비스의 상용화에 따라 다양한 서비스 시나리오에서 안전하게 양방향의 디지털 콘텐츠를 제공하기 위한 IPTV 보안 기술의 필요성이 중요시 되고 있다. 본 고에서는 유 무선망의 (모바일)IPTV 보안 기술과 현재까지 진행되고 있는 국내외 표준화 동향에 대해서 살펴본다.

• Journal of Broadcast Engineering
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• v.17 no.2
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• pp.295-304
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• 2012

IPTV current service change from a TV IPTV service providing digital broadcast, one- way VOD service, terrestrial broadcast to a web IPTV service,which is using wireless networks which is also used by interactive digital broadcasting However, IPTV, is being currently serviced, causes a lot of interaction with viewers because of inconvenience of using and has problems that users do not have enough content type to access. Additionally, there is also a problem that adding contents cover a large part of screen. To solve these problems, the thing that adding QR code to IPTV screen being recognized by Smartphone. In this way, we can provide the idea how to access to interaction information and also provide to clients an easy way creating and accessing to the contents by developing an editor that can insert QR code to video.