Adding different levels of QoS to the DVB-SH standard

We propose and analyze two strategies to provide different levels of quality of service (QoS) to the DVB SH standard. An extension of the interleaving scheme is investigated to support low latency service requirements for interactive services based on short messages. The first approach is a straightforward extension of the DVB SH interleaver scheme based on an early uniform interleaver profile, and the second one is the introduction of a super short interleaver, referred to as molded interleaver, which is embedded inside the standard DVB SH interleaver. An exhaustive analysis, based on laboratory measurements, shows the benefits of the molded interleaver. Finally a comparison between the modified interleaving strategy and the use of hierarchical modulation is presented.