US Patent No. 9,071,345

METHOD AND SYSTEM FOR OBTAINING AN IDLE SPECTRUM


Patent No. 9,071,345
Issue Date June 30, 2015
Title Method And System For Obtaining An Idle Spectrum
Inventorship Wenling Bai, Beijing (CN)
Chenggang Jiang, Beijing (CN)
Yuanyuan Li, Beijing (CN)
Yu Yang, Beijing (CN)
Assignee CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY, Beijing (CN)

Claim of US Patent No. 9,071,345

1. A method for obtaining an idle spectrum, comprising:
obtaining, by a central management unit, configuration information of a transmitter of an authorized system, and obtaining
geographic location information of candidate sense nodes; wherein the configuration information comprises: geographic location
information of the transmitter of the authorized system, spectrum information of the transmitter of the authorized system
and transmission power information of the transmitter of the authorized system;

selecting, by the central management unit from the candidate sense nodes, a designated number of sense nodes which are closest
to the transmitter of the authorized system from the candidate sense nodes according to the configuration information and
the geographic location information, and informing the selected sense nodes to perform spectrum sensing; and

receiving, by the central management unit, sensing results of the selected sense nodes, and obtaining information of an idle
spectrum according to the sensing results;

wherein the obtaining the information of the idle spectrum according to the sensing results comprises:
combining, by the central management unit, the sensing results and determining whether the authorized system is currently
transmitting signals on the spectrum; and

obtaining, by the central management unit, the information of the idle spectrum for a request node according to an idle spectrum
request message of the request node and a determination result on whether the authorized system is currently transmitting
signals on the spectrum;

wherein the idle spectrum request message carries maximum transmission power information of the request node;
the obtaining the information of the idle spectrum for the request node according to the idle spectrum request message of
the request node and the determination results on whether the authorized system is currently transmitting signals on the spectrum
comprises:

if the request node transmit using the maximum transmission power, calculating, by the central management unit, an interference
level suffered by the authorized system transmitting on the spectrum;

if the interference level is lower than a preconfigured threshold, determining, by the central management unit, that the spectrum
is not idle; otherwise, determining, by the central management unit, that the spectrum is not idle.