TITLE:
Buffer Occupancy of Double-Buffer Traffic Shaper in Real-Time Multimedia Applications across Slow-Speed Links
AUTHORS:
Ayodeji O. Oluwatope, Damilola T. Oyewo, Folake E. Olayiwola, Ganiyu A. Aderounmu, Emmanuel A. Adagunodo
KEYWORDS:
Multimedia Application; Slow-Speed Link; TCP; Buffer Occupancy; QoS
JOURNAL NAME:
Communications and Network,
Vol.5 No.1,
February
27,
2013
ABSTRACT: In this paper, a double-buffer traffic shaper was investigated to adjust video frame rate inflow into the TCP sender-buffer of a multimedia application source across a slow-speed link. In order to guarantee QoS across a slow-speed link (i.e. 1 MBPS), the double-buffer traffic shaper was developed. In this paper, the buffer size dynamics of double-buffer was investigated. The arrival and departure of frames were modeled as a stochastic process. The transition matrix for the process was generated and the stationary probability computed. A simulation program was written in Matlab 7.0 to monitor the buffer fullness of the second buffer when a 3600 seconds H.263 encoder trace data was used as test data. In the second buffer, it was discovered that over 90% of the play-time, the buffer occupancy was upper bounded at 300 frames per second and utilization maintained below 30%.