| 摘要 |
A method by which substations in a multiple access communication system, such as a mobile radio system, may access the base station. Access is determined by the base station in accordance with any of a plurality of operating modes during successive message time frames, the particular mode being determined by the base station from an estimate of prevailing traffic conditions. The selected operating mode during any frame is signified by a code and parameters transmitted by the base station in an Aloha invitation message which establishes such mode and the dynamic operation of the substations in that mode. The operating modes include a light traffic mode, a dynamic frame-length mode, a hybrid mode in which subsets of the population of the substations are formed, and a polling mode.
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