The Design And Implementation Of IP Multimedia Subsystem User Equipment With High Definition Audio Radio Function

The development of traditional radio service is subject to many constraints, simple business model, advertising revenue accounted for more than50%for most of the broadcasting station, advertising flooding, quality of the programs is difficult to improve. Convergence of3networks provides opportunities for the development of next-generation broadcasting service. The access to radio programs is no longer confined to limited radio channels. Webcast has become an important broadcasting alternative, which is in favor of expanding the influence of audio programs and target audiences. However, free webcast has not affected the business model, the operation of radio stations still rely on advertising. IP Multimedia Subsystem, or IMS belongs to the next-generation communications service network technology architecture, in which Session Initiation Protocol, or SIP, is employed as the core signaling protocol. IMS radio service is a kind of webcast that featured by user authentication and session signaling control mechanisms. The application of IMS service prefers broadcasting station as the typical audio content ISP. Broadcasting service of IMS will assist in-depth separation of producing and broadcasting, the broadcasting stations are focused on the production of high-quality audio programs, which will be broadcast to subscribers by telecom operators.An IMS audio radio terminal is designed in this thesis. It is focused on three aspects, the audio broadcasting service based on IMS terminal, service achievement through signaling interaction and the realization of high definition of audio radio.On the basis of the above key issues, research results follow below. Firstly, the software architecture of IMS user equipment with high definition audio radio function is designed, which includes network transport layer, signaling and media stack layer, live and on-demand services process layer and the user interface layer. Secondly, the signaling processes of HD audio radio function services are introduced and designed, including electronic access to the program, live, live release, on-demand and on-demand release. Thirdly, the media decoding module is improved, the HD of audio radio is achieved by extending the decoder in decoding module of Doubango framework to support another high performance codec-Opus. The Opus codec is extended by FFmpeg indirect integration in Doubango. Finally, the user interface is designed and audio radio function is implemented based on Android platform.Test results indicate that IMS user equipment, which is designed and implemented in this thesis, can support the signaling interaction of audio radio function, including the acquisition and interpretation of electronic program guide and the control of live and on-demand services. Media stack implements the decoding of HD audio radio. The functions and the effect of operation meet the design requirements.