Patent Number: 8,576,825

Title: Method and system for sensing available spectrum in wireless communication systems

Abstract: Managing RF spectrum usage by secondary, or unlicensed, devices in portions of the RF spectrum where licensed, or primary, services operate is a requirement of cognitive radio systems. To perform the necessary spectrum scanning, a transition period, such as a TTG or RTG can be extended and the scanning performed during the extended period. The presence of a primary service signal can also detected by detecting an energy signature of the primary service signal in a known sequence. In both cases, there is no need to define quiet periods during which secondary devices scan the RF spectrum, thus resulting in saving of resources and improved QoS.

Inventors: Wu; Shiquan (Nepean, CA), Yee; Jung (Ottawa, CA)

Assignee: Wi-Lan, Inc.

International Classification: H04J 1/00 (20060101)

Expiration Date: 1/05/12017