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 wherein each of a plurality of autonomous radio communication apparatuses has a hash function in common, each radio communication apparatus acting as a transmitting node when transmitting and acting as a receiving node when receiving, the method comprising:
- an information obtaining step, by one said radio communication apparatus acting as a transmitting node, of obtaining the radio communication apparatus'"'"'s own location information and current time information;
a range limiting step, by the one said radio communication apparatus acting as the transmitting node and another said radio communication apparatus acting as a receiving node, of narrowing a frequency range down using the obtained location information, time information and the hash function;
a detection step, by each of the transmitting node and the receiving node, of detecting usable frequency bands in the narrowed frequency range;
a request transmission step, by the transmitting node, of transmitting a connection request using the usable frequency bands;
a response transmission step, by the receiving node, of transmitting an acknowledgement response in a frequency band in which the receiving node has received the connection request; and
a selection step, by the transmitting node, of selecting, as a control channel, any one of frequency bands in which the transmitting node has received the acknowledgement response.
2 Assignments
0 Petitions
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.
5 Citations
7 Claims
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1. A frequency band coordination method in a cognitive radio system wherein each of a plurality of autonomous radio communication apparatuses has a hash function in common, each radio communication apparatus acting as a transmitting node when transmitting and acting as a receiving node when receiving, the method comprising:
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an information obtaining step, by one said radio communication apparatus acting as a transmitting node, of obtaining the radio communication apparatus'"'"'s own location information and current time information; a range limiting step, by the one said radio communication apparatus acting as the transmitting node and another said radio communication apparatus acting as a receiving node, of narrowing a frequency range down using the obtained location information, time information and the hash function; a detection step, by each of the transmitting node and the receiving node, of detecting usable frequency bands in the narrowed frequency range; a request transmission step, by the transmitting node, of transmitting a connection request using the usable frequency bands; a response transmission step, by the receiving node, of transmitting an acknowledgement response in a frequency band in which the receiving node has received the connection request; and a selection step, by the transmitting node, of selecting, as a control channel, any one of frequency bands in which the transmitting node has received the acknowledgement response. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A radio communication apparatus in a cognitive radio system comprising:
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a storage unit adapted to store a hash function; an information acquisition unit adapted to obtain the radio communication apparatus'"'"'s own location information and current time information; a range limitation unit adapted to narrow a frequency range down using the obtained location information, time information and the hash function; a detection unit adapted to detect usable frequency bands in the narrowed frequency range; a request transmission unit adapted to transmit a connection request using the usable frequency bands; a response transmission unit adapted to transmit an acknowledgement response in frequency bands in which it has received the connection request; and a selection unit adapted to select, as the control channel, any one of frequency bands in which it has received the acknowledgement response.
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Specification
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- Resources
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Current AssigneeKyushu Institute of Technology, Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
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Original AssigneeKyushu Institute of Technology, Toyota Infotechnology Center Co., Ltd. (Toyota Motor Corporation)
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InventorsAltintas, Onur, Oie, Yuji, Tsuru, Masato, Tsukamoto, Kazuya
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Primary Examiner(s)Chriss, Andrew
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Assistant Examiner(s)MAK, PETER K
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Application NumberUS13/121,596Publication NumberTime in Patent Office1,450 DaysField of Search370/328, 370/329, 370/462, 370/338, 370/501, 455/67.1, 455/68, 455/130, 455/423, 455/509, 455/511, 455/552, 455/450, 455/456.1US Class Current370/329CPC Class CodesH04W 72/0453 Resources in frequency doma...H04W 72/542 using measured or perceived...
