Patent ID: 8619789
Filing Date: 2013-12-31
Classification: H04B,H04W

Abstract:
1. A method, comprising: quick-sampling a frequency hopping sequence in a communication network by a battery-operated communication device at a periodic rate corresponding to a substantially low duty cycle; receiving, during a sample, a control packet at the battery-operated communication device from a main-powered communication device, the control packet containing timing information, the control packet transmitted by the main-powered communication device to account for worst-case clock drift error between the battery-operated communication device and the main-powered communication device; responding to the control packet with a link-layer acknowledgment to the main-powered communication device, the acknowledgment containing timing information from the battery-operated communication device; and re-synchronizing timing between the battery-operated communication device and the main-powered communication device at the battery-operated communication device based on the timing information in the control packet.