A satellite-based, world-wide cellular messaging system transmits paging messages to pagers. The messages are transmitted at unique times, on unique frequencies, and into uniquely identified cells according to a plan which is periodically revised and transmitted in advance to the pagers. Battery resources...http://www.google.ca/patents/US5613194?utm_source=gb-gplus-sharePatent US5613194 - Satellite-based cellular messaging system and method of operation thereof
