Nowadays more and more TV terminal devices for digital terrestrial broadcast are also equipped with broadband network interfaces. In view of this fact, we developed a novel redundancy on demand (RoD) system to improve the reception of terrestrial broadcast signals with the help of additional redundancy data transmitted via broadband networks. We propose various forms of redundancy, which can be provided on request by the receiving terminal in case of reception errors. RoD does not require any changes of the current broadcast network structure and is compatible with conventional receivers. Simulation results show that a small portion of additional redundancy data provided by the broadband network leads to significant performance improvements of the reception, making high data rate broadcasting feasible in a realistic environment. RoD introduces a new degree of freedom for network planning helping to reduce transmission cost and network energy consumption.
Dynamic Broadcast introduces network flexibilities and time flexibilities into the delivery of TV programs. New features such as switching between the broadcast and the broadband network, on-line adaptation of broadcast transmission parameters and the offering of pre-downloads enable us to deliver the TV content more efficiently to the audience. In order to minimize the cost and/or the spectrum consumption of the content delivery, we make full use of these features and take all influencing factors, including the audience size and the audience behaviour, into consideration. We build a mathematical model for the content delivery scheduling and propose a heuristic approach based on particle swarm optimization to optimize it. Through simulations, the convergence rate and the optimality of the heuristic approach are investigated and the sensitivities of the approaches to inaccurate input parameters are tested.
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