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Scheduling delay protocols integrating voice and data on a bus LAN

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3 Author(s)
Bolis, S. ; Dept. of Inf., Athens Univ., Athens, Greece ; Economou, E.G. ; Philokyprou, G.

Two new protocols integrating voice and data on a multiaccess broadcast bus LAN with reverse round robin service are presented. The protocols are based on a collision free scheduling delay access mechanism. According to this mechanism, each station computes its transmission time relying on the activity of the bus. In the first protocol, the authors use this mechanism for both voice and data traffic. In the second protocol, the data traffic is based on the above mechanism, while, for the voice traffic, they additionally exploit the periodicity of voice. Separation of the two traffic types is achieved by the requirement for sharing the channel alternately in voice and data rounds. The transmission of data packets and voice call packets for setting up calls is assigned to the data round while the transmission of voice packets is assigned to the voice round. The proposed protocols were studied via simulation tools. They satisfy the delay constraint of voice traffic and, at the same time, guarantee a sufficient bandwidth for data traffic. Results obtained under various traffic conditions are given.<>

Published in:

Communications, Speech and Vision, IEE Proceedings I  (Volume:139 ,  Issue: 4 )