Frequency Band Coordination Method and Radio Communication Apparatus in Cognitive Radio System
First Claim
1. A frequency band coordination method in a cognitive radio system comprising:
- a control channel determination step of determining a frequency band to be used as a control channel;
a data channel determination step of communicating a frequency use status around a transmitting node and a receiving node through said control channel and determining a frequency band to be used as a data channel; and
a channel changing step of communicating a frequency use status around a transmitting node and a receiving node during communication through said control channel, and changing the frequency band used as the control channel or the data channel when the control channel being used or the data channel being used has become unusable or is expected to become unusable.
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Accused Products
Abstract
There is provided a technique of establishing a communication between a transmitting node and a receiving node by selecting a suitable frequency band for communication without using a predetermined control channel. Firstly, a frequency band to be used as a control channel is selected from among low frequency bands, and information on frequencies and information on application'"'"'s quality requirements are exchanged between the transmitting node and the receiving node using the control channel. Then, a frequency band to be used as a data channel is determined, and a communication is started. During the communication, frequency use statuses around the transmitting node and the receiving node are notified through the control channel, and when the control channel or data channel being used becomes unusable, the channel is dynamically changed. Since a low frequency band having a long propagation distance is used as the control channel, exchange of information through the control channel can be performed before communication through a data channel in a high frequency band becomes possible, the data channel that meets the quality requirements can be determined quickly.
32 Citations
11 Claims
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1. A frequency band coordination method in a cognitive radio system comprising:
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a control channel determination step of determining a frequency band to be used as a control channel; a data channel determination step of communicating a frequency use status around a transmitting node and a receiving node through said control channel and determining a frequency band to be used as a data channel; and a channel changing step of communicating a frequency use status around a transmitting node and a receiving node during communication through said control channel, and changing the frequency band used as the control channel or the data channel when the control channel being used or the data channel being used has become unusable or is expected to become unusable. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A radio communication apparatus in a cognitive radio system comprising:
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a control channel determination unit adapted to determine a frequency band to be used as a control channel in a communication with a node at the other end of the communication; a data channel determination unit adapted to exchange with the node at the other end of the communication information on respective surrounding frequency use statuses and to determine a frequency band to be used as a data channel; and a channel changing unit adapted to exchange with the node at the other end of the communication information on respective surrounding frequency use statuses during the communication and changing the frequency band used as the control channel or the data channel when the control channel being used or the data channel being used has become unusable or is expected to become unusable.
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Specification