Hideya Yoshiuchi

Building Multicast Controller for Carrier-grade IPTV Service over Ethernet Passive Optical Network

Ethernet passive optical network (EPON) is an emerging high-speed access network technology that can provide an ideal transmission platform for high- bandwidth applications such as IPTV (internet protocol television). To deploy the carrier-grade IPTV service, especially HDTV (high definition TV), it is very essential to construct a controllable multicast architecture for IPTV service over EPON. In this paper, we present a multicast control solution over EPON system to satisfy the demand of the service management and control from the service providers. Furthermore, we successfully develop a multicast controller to perform the multicast control function including managing the eligibility of the subscribers and controlling the delivery of the multicast channels. The evaluation results demonstrate that the multicast controller can not only provide high processing performance but also improve the operation and management ability for the service providers greatly.

QoS-aware multicast for internet video applications

In this paper we extend our work in joint design of source rate control and congestion control for unicast video streaming, and propose a cross-layer design approach for Internet video multicast applications. By jointly designing source rate control at application layer and multicast congestion control at transport layer, our QoS-aware multicast approach can provide better QoS support for multimedia applications and significantly improve the playback quality, while maintaining good long-term TCP friendliness.

A repair mechanism for reliable multicast in Integrated Communication and Broadcast Networks

With the rapid growth of bandwidth requirement for mobile multimedia services, broadcast communication infrastructure is desired as one of the best solutions for avoiding communication congestion. Integrated Communication and Broadcast Network (ICBN), consisting of broadcast network and communication network, is one of the solutions. However, in reliable multicast service over ICBN, feedbacks from receivers cause feedback implosion problem. Also, because the broadcast network resources are shared by all the users in a system, data retransmission through broadcast network decreases system throughput. To avoid feedback implosion and congestion of broadcast network, we propose a local repair mechanism for reliable multicast in ICBN, which assures complete data reception by recovering the missing data from neighbor terminals. The experimental results show that our proposal avoids feedback implosion and improves the system throughput.

Trick Play Function for VOD with SVC source

Networked video applications have become more and more popular. However, most commercially available video on demand (VOD) solutions still lack trick play features (fast forward, fast rewind etc.), because it usually needs high processing complexity and huge consumption of network bandwidth to support trick play function. On the other hand, H.264 Scalable Video Coding (SVC) will be adopted in more and more video contents, and have great impact on the video application. In this paper, we propose a mechanism to support trick play function for H.264 SVC video source. According to different fast speed, appropriate combination of temporal and SNR layers are selected and transmitted in server side. Performance evaluation results show that the proposed mechanism can effectively reduce network bandwidth consumption, while keeping satisfied quality of experience (QoE) for users.

A Fast Channel Switching Method in EPON System for IPTV Service

This paper presents a fast channel switching method in Ethernet Passive Optical Network (EPON) system for IPTV service. Fast channel switching is one of the important features of successful IPTV systems. Users surely prefer IPTV systems with small channel switching time rather than a longer one. Thus a channel switching control module and a channel/permission list in EPON system’s ONU or OLT is designed. When EPON system receives channel switching message from IPTV end user, the channel switching control module will catch the message and search the channel list and permission list maintained in EPON system, then got the matching parameter of EPON for the new channel. The new channel’s data transmission will be enabled by directly updating the optical filter of the ONU that end user connected. By using this method in EPON system, it provides a solution for dealing with channel switching delays in IPTV service.

Enhanced Ethernet Passive Optical Network (EPON) system with storage Optical Network Unit (ONU)

This paper presents an enhanced EPON with storage ONU, which can store video in local storage ONU through checking the logical link identifier. By sending video from local storage, EPON downstream bandwidth efficiency is improved.

Dynamic Bandwidth Allocation for Group Service Assurance in Passive Optical Network

In this paper, an algorithm of dynamic bandwidth allocation is proposed for group services in passive optical network, where group bandwidth limitation is used to limit the total bandwidth for a group of users, instead of general individual bandwidth limitation for each user. Simulation results show that proposed group dynamic bandwidth allocation algorithm provides better quality of service for grouped users who tend to use bandwidth alternatively than that for users who tend to use bandwidth synchronously. Therefore, it is avoided that synchronous acting users occupy too much bandwidth, and the performance of group services is assured.

Extended bandwidth management mechanism among multi-OLTs

Passive optical networks (PON) is being considered as a promising solution for next generation broadband access network due to the convergence of broad bandwidth and low-cost fiber infrastructure along with its ability to successfully support IP-based multimedia applications. PON system has its individual bandwidth allocation mechanism compared with core network allocating bandwidth based on service priority level. However, no uniform bandwidth allocation mechanism from access network to care network. In this paper we propose a novel method of extended bandwidth allocation mechanism among multi-PON systems; then extended dynamic bandwidth allocation (DBA) algorithm in a Gigabit-capable PON (GPON) system for core network is presented. The bandwidth management mechanism among multi-optical line terminals (OLTs) can provide an end-to-end bandwidth guarantee for data transmission. We conduct detailed simulation experiments to study the performance and validate the effectiveness of the proposed method.

Automatic VLAN translation service over Ethernet passive optical network

As a cost-effective and broadband access network, Ethernet Passive Optical Network (EPON) has been attracting more and more attentions. Meanwhile, VLAN is being widely used in network configuration to meet the QoS and network management. Currently, with the growing of the network scale, basic VLAN service can not satisfy the requirements of most large-scale network deployment any more. So it is very important to provide enhanced VLAN service over EPON. In this paper, we propose a novel EPON system which can provide the automatic VLAN translation service. By comparing with the traditional way, it can be shown that the proposed system is much more economical and efficient to support the stacked VLAN function and VLAN translation function.

Local repair mechaism for reliable multicast in Integrated Communication and Broadcast Networks with scalability

With the rapid growth of bandwidth requirement for mobile multimedia services, broadcast communication infrastructure is desired as one of the best solutions for avoiding communication congestion. Integrated Communication and Broadcast Network (ICBN), consisting of broadcast network and communication network, is one of the solutions. However, in reliable multicast service over ICBN, feedbacks from receivers cause feedback implosion problem. Also, because the broadcast network resources are shared by all the users in a system, data retransmission through broadcast network decreases system throughput. To avoid feedback implosion and congestion of broadcast network, we propose a local repair mechanism for reliable multicast in ICBN, which assures complete data reception by recovering the missing data from neighbor terminals. The experimental results show that our proposal avoids feedback implosion and improves the system throughput.