| 摘要 |
A priority corresponding to the emergency level of a communication in each slave station is allocated to a time slot assignment request transmitted from each slave station to master station 1. When master station 1 receives the time slot assignment request to which the priority is set, the priority of the time slot assignment request is judged in slot assignment controller 1a. When there is not any vacant time slot having the priority judged and at the same time there is a vacant time slot whose priority is lower than the priority concerned, the time slot whose priority is lower than the priority concerned is allocated to the time slot assignment request, whereby the assignment waiting time until data having a high emergency level are transmitted can be shortened.
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