Architecture and rate control for network TV broadcasting on application-oriented QOS

This paper addresses the implementation architecture and protocol procedure of the dedicated broadband network TV broadcast system. According to application-oriented quality of service (QoS), two alternative rate control schemes for multiple DTV programs transmission are proposed collaborating with MPEG-2 system strategy and IP-base network multiplexing mechanism. As to the network bandwidth utilization, a flexible RTP-based encapsulation scheme for VBR transport stream (TS) transmission is realized to ensure the time synchronization requirement for MPEG-2 standard. As to the statistical multiplexing gain, moreover, a parallel VBR transcoding/encoding rate control algorithm for CBR TS transmission could achieve a consistent picture quality for multiple DTV programs under a constrained network bandwidth. For adapting the variable access network bandwidth, the system main control module can flexibly schedule the available rate control scheme for multiple slave service multiplexers.