Functional enhancements of cooperative session control for “Minimum Core” architecture

This paper proposes functional enhancements of cooperative session control for “Minimum Core” architecture. In past work, the authors invented a cooperative session control in which the call setup time is guaranteed through cooperating core and overlay networks while minimizing processing and traffic load on the core network. In the session control, each peer selects the core or overlay network for session establishment based on the measured latency on the overlay network. Proprietary technology (the so-called Blacklist method) was applied for latency decision on the overlay network. However, the performance of the native Blacklist method degrades during peer join and leave events. Accordingly, this paper proposes two approaches: Voluntary Latency Acquisition (VLA) and Blacklist Sharing (BS) as enhancements of the Blacklist method. These approaches allow the efficient detection of new blacklist entries that emerge due to peer join and leave events. This paper also reports simulation results that reveal the basic properties of the invented session control in a large-scale network and its performance during peer join and leave events.