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Method for switching and managing frequency access in cognitive radio system, base station and subscriber station using the same

A technology of cognitive radio and base station, applied in the direction of wireless communication, electrical components, communication between multiple stations, etc.

Active Publication Date: 2009-02-04
ELECTRONICS & TELECOMM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is possible to continue communication by re-establishing interrupted reception / transmission of data

Method used

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  • Method for switching and managing frequency access in cognitive radio system, base station and subscriber station using the same
  • Method for switching and managing frequency access in cognitive radio system, base station and subscriber station using the same
  • Method for switching and managing frequency access in cognitive radio system, base station and subscriber station using the same

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Embodiment Construction

[0058] Hereinafter, exemplary embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

[0059] Conventionally, a fixed communication system is established between a base station and a client terminal device by using an allowed frequency and a fixed channel bandwidth. However, since frequency resources may be limited according to time and place, there is a need to efficiently supply vacant frequency resources to places where there is a demand. In particular, the waste of frequency resources may be more severe since allowed frequency resources are not always used in low population density areas or in low frequency communications (eg, in public safety channels). A cognitive radio system designed to solve these problems is a communication system whereby frequency resources are efficiently used by searching for a frequency band available at a desired time period and a desired place and allocating it to an appropriate person...

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Abstract

Provided is a channel switching method for effectively performing channel switching in a cognitive radio system while protecting an incumbent user, a method of managing a frequency channel, and a base station and customer premises equipment (CPE) using the methods. In the channel switching method performed by the base station, a currently unavailable first frequency channel is detected from among at least one uplink / downlink frequency channel which is set as a communication channel with the CPE; a channel switching request message requesting switching from the first frequency channel to a second frequency channel is transmitted to the CPE; and the first frequency channel is switched to the second frequency channel when a channel switching report message reporting that channel switching is to be performed in response to the channel switching request message is received from the CPE.

Description

technical field [0001] The present invention relates to a method of switching and managing frequency access in a cognitive radio system, a base station (BS) and a customer terminal equipment (CPE, a type of user equipment) using the method, and more particularly, to allowing the BS or CPE Method of determining whether a set frequency channel (frequency access) is available, channel switching method for switching from a detected frequency channel determined to be unavailable to another frequency channel, and method of allowing BS or CPE to efficiently manage frequency channels . Background technique [0002] In the present invention, when the base station (BS) or customer equipment (CPE) determines that the communication channel being used is not available in the cognitive radio system due to the access of active users to it, multipath fading, or other channel degradation, switching The MAC layer control message of BS and CPE switches from the frequency channel used for comm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26
CPCH04W72/0413H04W16/14H04W36/06H04W72/21H04W72/0453
Inventor 高光进黄貹铉康法周姜忠求金日焕金昌周宋明善
Owner ELECTRONICS & TELECOMM RES INST