Abstract-According to the characteristics of satellite emergency communication, combined with the UDP protocol and the TCP protocol of the advantages and disadvantages, the article puts forward an improved expanded with reissue of double reliable D -RCUDP protocol. This paper mainly introduces the improved D-RCUDP protocol application background, the hierarchical structure, the core mechanism, application platform and experimental results.
IMS offers a unified service trigger mechanism, whose core is triggering the service to the corresponding SIP application server which based on initial filter criteria. Then the exclusive SIP application servers provide various valueadded multimedia services for the users. This paper researches how to create the exclusive service data which is Initial Filter Criteria, when a user receives an IMS subscription which contains specific value-added services. Then the SIP request initiated can be implemented routing to the appropriate application server accurately.
In view of IP multimedia subsystem (IMS) which is the focus of technical research in the field of communication, analyse the scheme of IMS network based on service provision and service triggering mechanism. According to the application triggering architecture, service triggering data and service triggering process, this paper carried out a detailed analysis, and set up IMS system basing on Linux operating system. Then take a test to the system function whose results show that the service scheme ensures the normal use of services provided by IMS service architecture when a user is performing IMS calling.
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