Scheduling real-time data items in multiple channels and multiple receivers environments

The problem of transmitting data items with timing constraint in the multiple broadcast channels where clients equipped with multiple receivers is studied. In our approach, the data items are divided into two sets, the broadcast data set and the on-demand data set. The data items in the broadcast data set is periodically broadcast on the broadcast channels while the data items in the on-demand data set are transmitted when they are requested. The server offline allocates the data items in the broadcast data set to the multiple broadcast channels. The clients retrieved data items from the broadcast channels are guaranteed to receive them within the timing constraint. Once the desired data item is not included in the broadcast channels, clients make requests associated with deadlines to the server. By using the bandwidth remaining for the on-demand mode, the server broadcasts the requested data items in an online fashion. The intention of our work is to serve as many requests as possible.