08305917 is referenced by 6 patents and cites 9 patents.

A radio communication system (100) provides a radio air interface at a master node (102) for subscriber units associated with the master node. Among the subscriber units are several slave nodes (104, 106). The communication system has the ability to operate as a secondary user in unused spectrum portions of a frequency band otherwise reserved for primary operators, such as licensed broadcasters. The master node accesses an authorization server (108) to obtain a list of unused channels in the region of the master node. Each slave node also contacts the authorization server to obtain a list of unused channels in the region where each respective slave node is located, via another network (118, 121). The unused channels common to the slave nodes and the master node are used to create a backup radio operating parameter list which is used by the master node if a fault occurs between the master node the authorization server.

Title
System and method for maintaining a backup radio operating parameter list in a secondary use communication system
Application Number
12/409472
Publication Number
8305917 (B2)
Application Date
March 23, 2009
Publication Date
November 6, 2012
Inventor
David P Gurney
Carpentersville
IL, US
Ramandeep Ahuja
Chicago
IL, US
Agent
Barbara R Doutre
Assignee
Motorola Solutions
IL, US
IPC
H04J 3/16
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