Patent ID: 6459704
Filing Date: 2002-10-01
Classification: G01S,G08B,H04W

Abstract:
A frequency hopping spread spectrum method for communicating a message, the steps comprising the following steps in the sequence set forth:A) assigning a priority to the message; B) selecting a frequency and setting a timer to a hop interval and starting the timer; C) sensing a channel at the selected frequency; D) waiting an interval based on the priority of the message, restarting the process at step B) whenever the timer expires and the channel has not been clear for the interval, wherein a new frequency is selected and the timer is restarted; E) transmitting the message if the selected frequency is still clear; F) waiting until an occurrence of at least one of an acknowledgment is received and the timer expires; and G) repeating steps B) through F) when at least one of the message was not transmitted in step E) and the acknowledgment was not received in step F) occurs, wherein a different frequency is selected each time step B) is repeated.