Patent ID: 6839542
Filing Date: 2005-01-04
Classification: H04B,H04L,H04W

Abstract:
1. A method for a first portable communication device of a plurality of portable communication devices located at a first location in a wireless communication system to establish communication with a second portable communication device of the plurality of portable communication devices located at a second location, each of the plurality of portable communication devices having a positioning system receiver receiving current location information from a positioning system and having a transceiver for communication at a particular frequency band, the method comprising steps of: transmitting a first message to the second portable communication device; if the second portable communication device has received the first message, receiving a first acknowledgment from the second portable communication device; otherwise, searching for a third portable communication device of the plurality of portable communication devices; if the third portable communication device is unavailable, indicating the second portable communication device is unreachable; otherwise, instructing the third portable communication device to function as a first router; transmitting the first message to the third portable communication device; instructing the third portable communication device re-transmit the first message as a first repeat message to the second portable communication device; and, determining if the second portable communication device has received the first repeat message.