Method for direct wireless data exchange in ad-hoc mode between moving road users in traffic telematics system, involves exchanging data over commonly used transmission channel by road users, where arbitrary road user takes role of master

摘要

The method involves exchanging data over a commonly used transmission channel by road users. An arbitrary road user on running out from a free transmission channel, takes the role of a master and transmits data in a transmission cycle with a length of two time slots. The road user transmits a synchronization burst in one time slot, which prepares a road user for receiving a user data burst. The master transmits the user data burst in a directly following time slot according to synchronization burst, where the timing of Terrestrial trunked radio direct-mode operation standards is used.