A world first development of a multipoint videophone system over 3G-324M protocol

  • Authors:

  • Hideo Ohira;Mitsura Kodama;Masahiko Yoshimoto

  • Affiliations:

  • Cross Media Business Dept, Mobile Multimedia Division, NTT DoCoMo Inc., Tokyo, Japan.;College of Commerce, Nippon Univ., Tokyo, Japan.;Department of Electrical and Electric Engineering, Kanazawa University, 2-40-20 Kodatsuno Kanazawa Ishikawa 920-8667, Japan

  • Venue:
  • International Journal of Mobile Communications
  • Year:
  • 2003

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Abstract

This paper describes a world first development of a multipoint videophone system over third generation wireless cellular phone services using the 3G-324M circuit-based international standard protocol. A multipoint TV phone system comprises a control server and a multipoint control unit (MCU), and enables multipoint conferencing systems over 3G-324M. The picture quality is 176 by 144 picture size format (QCIF) and 10fps at 64kbps constant bitrate. The control server unit controls the conference reservations from the users, and MCU controls audio/visual processing of mixing audio and video data. Up to eight people can join the same meeting using 3G-visual terminals over 3G-324M; also, simultaneously, 60 3G-visual terminals can be connected to the system, and the number of terminals can be extensible according to market demand. In this paper, the system architecture is described. Since this system enables audio-visual communications anywhere and at anytime, audio-visual communications are expected to penetrate the market.