Design and implementation for reducing zapping time of IPTV over overlay network

The QoE improvement provides improvement in the speed of internet service. If we can reduce one second of the delay of internet service, there will be a big improvement for the QoE. There is the same situation with IPTV service. Reducing zapping time is the linchpin in the QoE of the IPTV service. The main reason of the zapping time occurrence is the latency when user joins IGMP group. The second causation is the latency of transporting video, and the third one is latency that a settop box takes to encode the video. In this paper, we mainly research how to reduce the latency when the user joins into the IGMP[2] group. In IPTV, each user must join the group according to the IGMP group. We are proposing to tie join messages of the same IPTV group's users together and after send to the server. With this way we can reduce the latency of the joining to the IGMP. In this paper, we analyzed zapping time problem about IPTV service, and we also addressed network performance and user management. We tested our solution in the overlay multicast testbed and analyzed the results of test.