QoS in mobile networks by assigning priorities to SCTP streams

A two level QoS architecture for network mobility is proposed. At the transport layer the Mobile Stream Controlled Transport Protocol (MSCTP) is modified by assigning priorities to multiple streams in a MSCTP association. The performance of the protocol is further improved at the interface level by modifying the existing Concurrent Multipath Transfer (CMT) implementation of SCTP. The data from the application layer are classified and added into their respective streams which are then processed based on the priority of the stream. Also the transmission of data packets over the existing interfaces is based on the priority of the data, thus reducing the delay experienced by high priority data. The evaluation showed that the proposed QoS architecture achieves around 15% increase in the processing of high priority data at the transport layer and significant 50% increase in the processing of high priority data at the interface level.