Mechanisms for QoS Signaling in a Mobile Internet Environment

End-to-end signaling of Quality of Service (QoS) requests provides an interface for end systems to specify certain performance characteristics for transmitting data flows across communication networks. If routing and packet forwarding is enhanced by capabilities to support mobile end systems, this imposes new challenges for intermediate nodes to handle end-to-end signaling. In this paper, we investigate these challenges and identify a crucial set of abstract functions to augment certain nodes along the data path, in order to deliver an end-to-end signaling service for mobile end systems. Opposite to previous approaches, we do not incorporate such enhancements into basic building blocks of the system, but instead we present the design of two additional independent components to carry out the new functionality. One component is given by an extension to QoS signaling, which allows to handle service requests in advance. The second component, the Third-Party Signaling Protocol (TPSP), provides a generic set of primitives to request enhanced signaling functionality at intermediate nodes.

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