Video transport over wireless networks

ABSTRACT

In this paper, we propose an efficient scheme to transport video over wireless networks, specifically cdma2000® 1x. Speech transmission over cdma2000® uses a variable rate voice coder (vocoder) over a channel with multiple fixed rates. We apply these ideas to compressed video transmission over wireless IP networks. Explicit Bit Rate (EBR) video compression is designed to match the video encoder output to a set of fixed channel rates. We show that in comparison with VBR video transmission over a fixed rate wireless channel, EBR video transmission provides improved error resilience, reduced latency and improved efficiency.

REFERENCES

• 1: 3GPP2 C.S0002-0, Physical Layer Standard for cdma2000 Spread Spectrum Systems.
• 2: 3GPP2 C.S0003-0, Medium Access Control (MAC) Standard for cdma2000 Spread Spectrum Systems.
• 3: 3GPP2 C.S0047-0-1.0 - Link-Layer Assisted Service Options for Voice-over-IP: Header Removal (SO60) and Robust Header Compression (SO61).
• 4: 3GPP2 C.S0014-0-1 - Enhanced Variable Rate Codec, Speech Service Option 3 for Wideband Spread Spectrum Digital Systems.
• 5: 3GPP2 C.S0020-0 - High Rate Speech Service Option for Wide Band Spread Spectrum Communication Systems.
• 6: ITU-T Recommendation H.263: "Video Coding for Low Bitrate Communication".
• 7: ISO/IEC 14496-1~6: "Information Technology - Generic Coding of Audio-Visual Object".
• 8: Lakshman, T.V., Ortega, A., Reibman, A.R., "VBR Video: Tradeoffs and Potentials," Proceedings of the IEEE, vol. 80, pp 952 -- 973, May 1998.
• 9: Lundby, S. and Garudadri, H. "Simulation assumptions for modeling physical layer errors and error patterns," TSG-C SWG1.2 C12-20040517-020 , Montreal, May 2004.
• 10: Wiegand, T. , Sullivan, G. and Luthra, A. (Editors), "Draft ITU-T Recommendation and Final Draft International Standard of Joint Video Specification (ITU-T Rec. H.264 | ISO/IEC 14496-10 AVC)," JVT-G050r1, Geneva, Switzerland, May 2003, available <ftp://ftp.imtc-files.org/jvt-experts/2003_05_Geneva/JVT-G050r1.zip>.

INDEX TERMS

Primary Classification:
  H. Information Systems
  H.4 INFORMATION SYSTEMS APPLICATIONS
      H.4.3 Communications Applications
          Subjects: Computer conferencing, teleconferencing, and videoconferencing

Additional Classification:
  C. Computer Systems Organization
  C.2 COMPUTER-COMMUNICATION NETWORKS
      C.2.1 Network Architecture and Design
          Subjects: Circuit-switching networks; Packet-switching networks; Wireless communication

General Terms:
Performance, Standardization

Keywords:
H.264, MPEG-4, VoIP, constant bitrate, error resilience, variable bitrate, video compression