Frequency point scanning method, processor, device and system for LTE (long term evolution)

Abstract

The embodiment of the invention discloses a frequency point scanning method, processor, device and system for LTE (long term evolution). The frequency point scanning method comprises the steps of acquiring power of subcarriers in a frequency band, and calculating the average power of the subcarriers in the frequency band by taking a resource block as a unit; determining a candidate frequency point set in a candidate frequency point region according to a preset step, wherein the candidate frequency point region comprises the resource blocks meeting a preset number requirement, and the average power of the subcarriers in the frequency band of the resource blocks is more than a judgment threshold; and eliminating the frequency points, which do not meet the power detection conditions on principle synchronous signs PSS and secondary synchronous signs SSS, in the candidate frequency point set, and demodulating failed false frequency points by demodulating a physical broadcast channel (PBCH) to obtain frequency point scanning results. The frequency point scanning method overcomes the defect of long time for scanning the frequency points in a broad band one by one in the prior art, and can obtain the frequency point scanning results in the eligible candidate frequency point region and eliminate the influence of other dynamic allocation channels on power, so that the accuracy of the candidate frequency points is enhanced.

Description

technical field [0001] The present invention relates to the technical field of communications, and more specifically, to an LTE-oriented frequency point scanning method, processor, device and system. Background technique [0002] In the mobile communication system, the frequency point scanning of the user terminal UE refers to that the UE tries to search within the frequency range it accepts when there is no pre-stored cell or the search for the pre-stored cell fails when the UE is powered on for a period of time or loses network coverage. Activities that effectively serve the working frequency of the cell. [0003] The existing frequency point scanning method is to measure the received power of each possible frequency point, and arrange the power measurement values ​​of the possible frequency points in descending order, so as to perform initial cell search according to the power measurement value from large to small. [0004] There are at least the following disadvantages ...

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Problems solved by technology

[0004] There are at least the following disadvantages in the existing LTE-oriented frequency point scanning method: since the channel allocation in the LTE communication system only has PSS, SSS, and PBCH (in LTE, the UE utilizes the primary synchronization symbol PSS and the secondary synchronization symbol SSS and demodulates the physical layer The broadcast channel PBCH obtains system information including system bandwidth) and a few channels such as the reference symbol RS are sent at a fixed time, and other channels are dynamically allocated. Therefore, whether to allocate channels for other channels has a great impact on power measurement, resulting in power measurement The sorting is not accurate, and at the same time, the existing frequency point scanning method needs to scan frequency points one by one for various bandwidths, so there is a problem of long frequency point scanning time

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