Patent ID: 7889777
Filing Date: 2011-02-15
Classification: H04B

Abstract:
1. A method for synchronizing communications between an end device and a coordinator device in a frequency hopping wireless network, the method comprising the steps of: a. the coordinator device scanning a plurality of frequencies for request for services messages during a time slot where no data packets are being transferred; b. the end device sending a request for services message on a first frequency of the plurality of frequencies, where the message includes a preamble identifiable by the coordinator device; c. if the coordinator device detects the request for service preamble on the first frequency, the coordinator device receiving the remainder of the request for services message on the first frequency and sending a service packet message to the end device from which it received the request for services message on the first frequency, where the service packet message includes: d. if the end device receives the service packet message, the end device changing its current frequency sequence value and timing information to match the frequency sequence and beacon timing information values sent by the coordinator device in order to synchronize the end device with the coordinator device.