A Spectrum Handover Method and Device Based on Cognitive Radio System

Abstract

The invention discloses a spectrum switching method and device based on a cognitive radio system. The method includes: before spectrum switching, the base station equipment and the terminal equipment maintain uplink synchronization at the source working frequency point; when the base station equipment is at the target working frequency point, After the cell is restored, it determines whether uplink synchronization is maintained between itself and the terminal device; if so, allocates uplink resources to the terminal device on the target operating frequency point, and sends the allocated uplink resources to the terminal device on the target operating frequency point; where , the uplink resource is used to enable the terminal device to send a spectrum switching completion message indicating that the terminal device has successfully completed the spectrum switching process. In the embodiment of the present invention, the random access process is omitted during the spectrum switching process to avoid random access conflicts during the spectrum switching process of the CR system, reduce the spectrum switching failure probability and service interruption time of the CR system, and improve the user experience of the CR system.

Description

technical field [0001] The present invention relates to the field of communication technologies, in particular to a spectrum switching method and equipment based on a cognitive radio system. Background technique [0002] Radio communication spectrum is a precious natural resource. With the rapid development of wireless communication technology, the problem of poor spectrum resources is becoming more and more serious. In order to alleviate the shortage of spectrum resources, relevant departments and institutions have carried out monitoring and research on wireless communication spectrum. It is found that some frequency bands (such as TV frequency bands) are not used most of the time or in most regions, while some frequency bands have multi-system and multi-user competition at the same time, that is, the use of spectrum resources is inconsistent. Equilibrium phenomenon. [0003] It is against this background that the concept of CR (Cognitive Radio, Cognitive Radio) came into ...

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Problems solved by technology

[0007] During the spectrum switching process of the CR system, it is necessary to switch all RRC (Radio Resource Control, radio resource control) terminal devices in the entire cell to the target operating frequency point, and there are many terminal devices in the RRC connection state (it can be more than 1200 ), so the use of the existing spectrum switching method will cause a large number of terminal devices to concentrate on performing the random access process on the target operating frequency in a short period of time, resulting in a high random access failure probability and random access delay, thus This results in a higher frequency spectrum switching failure probability and a higher service interruption time, which affects the user experience of the CR system

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