A communication system (100) is provided comprising a communication resource controller (110) which synchronously communicates with a communication unit (120). Communication range of the system is extended by adjusting transmission timing of a channel access request based on position information received...http://www.google.fr/patents/US5225843?utm_source=gb-gplus-shareBrevet US5225843 - Method for accessing a trunked communication system
Method for accessing a trunked communication system
