This paper is an up-to-date short overview of the QoS for Satellite IP networks. Some definitions, parameters and requirements for QoS are given. IP QoS Architectures are presented and various contributions to end-to-end QoS at each layer are included. DVB-RCS and evolution to standard DVB-S2 - RCS to support emerging Internet services via satellite is also briefly approached. Possible integration with Next Generation Network (NGN) architectures in order to meet their QoS requirements is presented. The horizontal integration of the satellite segment into an IMS network may provide a consistent QoS management across the entire network, while mechanisms defined in the IMS framework bring flexible and performant QoS support to the session and network.
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