Method for dynamic frequency selection and system supporting the same in a cognitive radio wireless communication system
First Claim
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1. A method of dynamically selecting a frequency band in a Customer Premise Equipment (CPE) in a Cognitive Radio (CR) wireless communication system, the method comprising:
- receiving, from a CR base station (CR BS), a band monitoring request message including information identifying frequency bands that the CPE is to monitor;
monitoring, at the CPE, reception of a signal from a neighboring primary Base Station (BS) in a current frequency band now in use, based on the band monitoring request message;
receiving, at the CPE, a current frequency band list including currently available frequency bands, the current frequency band list being broadcasted periodically by the CR BS;
receiving, at the CPE, a candidate frequency band list including candidate frequency bands, the candidate frequency band list being broadcasted intermittently by the CR BS; and
sending a sensing report message including information about the current frequency band to the CR BS,wherein the available frequency bands include frequencies on which a signal from a primary system has not been sensed.
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Abstract
Dynamic frequency selection based on CR is provided. A CR BS detects an interference-free and unused frequency band. When sensing a new BS that has great signal strength and requires the frequency band during communications in the frequency band, the CR BS releases the frequency band and dynamically selects another frequency band to avoid interference.
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Citations
15 Claims
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1. A method of dynamically selecting a frequency band in a Customer Premise Equipment (CPE) in a Cognitive Radio (CR) wireless communication system, the method comprising:
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receiving, from a CR base station (CR BS), a band monitoring request message including information identifying frequency bands that the CPE is to monitor; monitoring, at the CPE, reception of a signal from a neighboring primary Base Station (BS) in a current frequency band now in use, based on the band monitoring request message; receiving, at the CPE, a current frequency band list including currently available frequency bands, the current frequency band list being broadcasted periodically by the CR BS; receiving, at the CPE, a candidate frequency band list including candidate frequency bands, the candidate frequency band list being broadcasted intermittently by the CR BS; and sending a sensing report message including information about the current frequency band to the CR BS, wherein the available frequency bands include frequencies on which a signal from a primary system has not been sensed. - View Dependent Claims (2, 3, 4, 5)
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6. A method of dynamically selecting a frequency band in a Base Station (BS) in a Cognitive Radio (CR) wireless communication system, the method comprising:
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transmitting, to a Customer Premise Equipment (CPE), a band monitoring request message including information identifying frequency bands that the CPE is to monitor; broadcasting periodically, at the CR BS, a current frequency band list including currently available frequency bands; broadcasting intermittently, at the CR BS, a candidate frequency band list including candidate frequency bands; sending a band change message including information about an available frequency band to the CPE, when determining from a sensing report message received from the CPE that a current frequency band needs to be changed; and changing, at the CR BS, the current frequency band to the available frequency band, upon receipt of a sensing report message in response to the band change message from the CPE, wherein the available frequency bands include frequencies on which a signal from a primary system has not been sensed. - View Dependent Claims (7, 8)
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9. A Cognitive Radio (CR) wireless communication system for dynamically selecting a frequency band for use in a CR scheme, the system comprising:
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a Customer Premise Equipment (CPE) to receive a band monitoring request message including information identifying frequency bands that the CPE is to monitor, to monitor reception of a signal from a neighboring primary Base Station (BS) in a current frequency band now in use based on the received band monitoring request message, to receive a current frequency band list and a candidate frequency band list, and to request a change of the current frequency band; and a CR BS to transmit the band monitoring request message, to broadcast periodically the current frequency band list including currently available frequency bands, to broadcast intermittently the candidate frequency band list including candidate frequency bands, to select an available frequency band upon receipt of the request of changing the current frequency band from the CPE, and to notify the CPE of the selected frequency band, wherein the available frequency bands include frequencies on which a signal from a primary system has not been sensed. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification