A novel P2P IPTV system for IPv4/v6 networks

As IPv4 address pool has been completely depleted and the transition from IPv4 to IPv6 has become a trend, P2P video streaming through IPv4/v6 hybrid network is now needed, for equipments with different types of IP addresses widely exist on the Internet. Traditionally, large-scale commercial P2P-IPTV systems have been deployed in IPv4 networks. However, these systems do not support equipments with IPv6 addresses and cannot work in IPv4/v6 hybrid networks. To overcome this problem, we propose a novel dual-stack-based architecture to distribute contents to different networks. The core element of the system is the dual-stack tracker which makes all equipments with IP address interconnect with each other and form a hybrid network. Meanwhile, equipments with IPv4/v6 addresses act as bridges, which distribute contents to IPv4 and IPv6 networks. The paper focuses on how to make all equipments with different types of IP addresses work in one system, analyzing the architecture and performance results related to the use of IPv6 bandwidth. This system has been deployed and broadcasted the 2010 FIFA World Cup South Africa with 755 kbps video stream, and our results demonstrate the feasibility of video over IPv4/v6 hybrid network for a representative application.     

一种卫星移动通信中的L/P跨层设计

针对卫星移动信道,提出了一种基于链路层(Link Layer)的混合自动请求重传(HARQ)技术联合物理层(Physical Layer)自适应编码调制(AMC)技术的L/P跨层设计;在Nakagami-m信道模型中验证其性能,并与非跨层设计结果作了对比。理论分析及仿真比较结果表明,这种跨层设计可以综合有效地优化卫星移动通信性能。