| Mobile videophone service greatly increases the user experience, it is considered as a landmark application of 3G networks. With the increase in the number of domestic 3G users,3G videophone service will have broad market prospects. Meanwhile, the videophone evaluation software, which is closely related to 3G video phone service, will also have clear and huge market demand.This paper analyzes the mobile videophone protocol stack 3G-324M and mobile video telephony service model, on this basis, proposed a video phone quality assessment program, and describes the detailed design and implementation of the program. In this paper, videophony assessment program is based on the TD-SCDMA network testing software, but the evaluation program also applies to WCDMA and CDMA2000.The research and results of this paper are as follows:1) Researched TD-SCDMA network testing situation, analyzed the differences between TD-SCDMA network testing and 2G network testing.2) Analyzed the mobile videophone protocol stack 3G-324M, depth analysis of the main protocols in 3G-324M.3) Depth studied of mobile video phone service model and processes.4) Proposed a video phone quality assessment program,and this program is reliable and reasonable, has important significance of project and market.5) Described the design and implementation of the videophone videophone. Videophone evaluation module consists of four sub-modules:3G-324M sub-module, data transmission sub-module, the video quality evaluation sub-module and a graphical user interface module. The function of each sub-module as follows:3G-324M sub-module complete encoding and decoding voice data, encoding and decoding video data,and the implementation of H.223 multiplexing protocols data.data transmission sub-module complete the establishment and release,of videophone link, audio and video data end-to-end transmission.video quality assessment sub-module completed quality assessment of audio and video files which are after transmission, given MOS score, to simulate the user's subjective feelings.graphical user interface sub-module provides users with interactive interface, responsible for receiving user control information, presentation of data, and multimedia data playback. |
