| 摘要 |
A communication protocol is proposed, to be used by a main station and a plurality of mobile sub-stations, while time slots are used in which data packets are transmitted. A substation that has a message to be sent to the main station first transmits a request-for-access data packet to the main station. If the sub-station knows its own position as well as that of the main station, the sub-station applies an advancement of time to the request-for-access data packet, so that this may be longer and contain more information, such as a self-selected recognition code and/or information relating to the length of the message to be sent. The main station measures the instant at which the request-for-access data packet is received relative to the time slot distribution and sends a correction of the advancement of time to the sub-station. After a send permission has been granted, the data packets are transmitted with a length essentially corresponding to that of the time slots, so that more information can be transmitted per data packet.
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