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Global Scheduling Approach to Conflict-Free Multiaccess via a Data Bus

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1 Author(s)
Mark, Jon W. ; Waterloo Univ., Ont., Canada

A global scheduling multiple access (GSMA) scheme for data communication via a high speed bus is described. The GSMA scheme, which has a variable length frame format and the desirable property of guaranteeing each active user a minimum service per frame, attains conflict-free multiaccess and has the flexibility of providing more channel capacity to the large users. An expression for the mean system delay under a Poisson arrival law and an imbalanced loading (multi-rate) environment is derived. Numerical results indicate that the GSMA scheme offers substantially higher channel utilization compared to the synchronous time-division multiple access (STDMA) scheme, particularly at the low throughput region. It is shown also that the GSMA system offers superior delaythroughput performance to an STDMA or POLLING system.

Published in:

Communications, IEEE Transactions on  (Volume:26 ,  Issue: 9 )