The Design And Implementation Of TCAP Protocol Mapping Subsystem In Parley Gateway

The development of value-added services leads to the emergence of NGN(Next Generation Networks), which is based on packet switching. NGN adapts the layered structure consisting service layer, control layer, media transport layer and access layer. The Application Server locates on NGN's service layer. It provides environment of executing and managing various value-added services and intelligent services. Besides, it provides the third party service providers with open service interfaces. One of the open service interfaces that applies widely is Parlay API(Application Programming Interface). In the architecture of Parlay, the Parlay gateway screens the heterogeneity of underlying networks and provides the Application Server and third party service providers with the capability of controlling underlying networks in the standardized form of Parlay API.Parlay gateway is composed of framework subsystem, protocol mapping subsystem, networks management subsystem and operation and maintaining subsystem. Protocol mapping subsystem performs adaption of underlying network devices. TCAP(Transaction Capabilities Application Part) protocol mapping subsystem is one component of the whole protocol mapping subsystem, which provides adaption of TCAP and TC(Transaction Capabilities) user protocols when underlying network is traditional fixed or mobile Intelligent Network. TCAP is divided into two sublayers: component sublayer and transaction sublayer. Above the TCAP, there are TC user application protocols. TCAP protocol mapping subsystem performs the adaption of TCAP component sublayer and TC user protocols. The subsystem is composed of three modules: protocol stack adapter, TCAP protocol processor and TC user processor. We adopt asynchronous mode instead of synchronous one as message...