| 摘要 |
In the digital communication systems, devices and methods described, a transmission medium is shared by means of service messages indicating to each digital communication device whether or not that device is authorized to send on the medium once the medium is free after the service message. Certain of these messages are collective authorization-to-send messages indicating to a group of communication devices that each is authorized to send by return. When such a collective message is sent, each receiving device, when attempting to send on the medium, determines whether or not it may send in return, in accordance with a preset rule which preferably involves a random ballot.
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