METHOD FOR MULTIPLEXING/MODULATING LAYERED DATA IN BROADCAST TRANSMISSIONS

摘要

The present invention relates to broadcasting in a cellular communications system. An object of the present invention is to broadcast user data according to a hierarchical data layer model, whereby a basic data layer has superior coverage in the cell and provides for a basic QoS. Enhanced data layers are available in addition to the basic data layer, albeit with less wide coverage in the cell, and provide for a higher QoS than if the basic layer only was detected. According to the invention the hierarchical model is provided by channel coding the different data layers at different coding rates. The coded data layers are multiplexed on a physical channel separately from the modulation and broadcasted in the cell. An advantage with the solution is that robust modulation methods may be used, and flexibility in the allocation of resources to the different layers.