Simulation studies of round robin contention in a prioritized CSMA broadcast network. [Dynamic assignment]
Many studies of broadcast local networks have focused on media-contention resolution schemes. These schemes attempt to minimize the loss of transmission bandwidth due to collisions and to provide an allocation mechanism for the total available bandwidth. A new contention option for the Network Systems Corporation Hyperchannel product attempts to supply more equitable allocation of trunk bandwidth than their simple priority scheme. Direct simulation studies of the new option indicate that its bandwidth allocation is indeed more equitable. They also indicate that a slight change in the proposed mechanism might be required to keep the collision level induced by the new option acceptably low. Simulation studies of the new option, along with the current message-level protocol proposed for the Hyperchannel, indicate that the effect of the new option is masked by the proposed message protocol. These studies suggest that, in some cases, the emphasis being placed on contention mechanisms for broadcast local networks might be misplaced. More emphasis should perhaps be placed on the network's message- and higher-level protocols, at least until instances of these higher-level protocols can be found that accurately deliver the allocation made available by the contention schemes to the network user. 20 figures.
- Research Organization:
- California Univ., Livermore (USA). Lawrence Livermore Lab.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6461724
- Report Number(s):
- UCRL-81715; CONF-781091-1
- Country of Publication:
- United States
- Language:
- English
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