Network synchronization method and device

Abstract

The invention relates to the technical field of the internet of things, and discloses a network synchronization method and device. The implementation way comprises the following steps: determining a center frequency point of a long-term evolution cell according to an acquired system message of a narrowband internet of things cell, computing a time domain location of a main synchronization signal of the long-term evolution cell in a wireless frame of the narrowband internet of things cell, and receiving the main synchronization signal at the time domain location, thereby performing the networksynchronization. Through the implementation way disclosed by the invention, the narrowband internet of things system can perform the network synchronization by using the main synchronization signal ofthe long-term evolution cell; the timing error estimation error in the network synchronization is greatly reduced, and the frequency domain narrowband interference resistance and the noise resistanceunder the low signal-to-noise ratio are greatly improved.

Description

technical field [0001] The invention relates to the technical field of Internet of Things communication, in particular to a method and device for network synchronization. Background technique [0002] In the NB-IoT (Narrow Band Internet of Things, narrowband Internet of Things) system, three working deployment scenarios are supported: independent deployment mode, in-band deployment mode and guard band deployment mode. The frequency band occupancy of the three working deployment scenarios is as follows: figure 1 As shown, wherein, the independent deployment mode can utilize a separate frequency band, which is suitable for the re-cultivation of the GSM (Global System for Mobile Communication, Global System for Mobile Communications) frequency band, and the in-band deployment mode can utilize the LTE (Long Term Evolution, Long Term Evolution) carrier For any resource block in the middle, the guard band deployment mode can utilize the edge useless frequency band in the LTE syste...

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Problems solved by technology

[0004] However, in the process of implementing the present invention, the inventors of the present application found that in the NB-IoT system, after the terminal device resides in the cell, it generally monitors the timing difference with the network by receiving NPSS signals, and maintains the timing difference with the network. Synchronization, however, NPSS signals occupy a smaller bandwidth in the frequency domain, and the ability to resist narrow-band interference in the frequency domain is weaker. Moreover, the ZC sequence used by NPSS is shorter, and the correlation in low SNR scenarios is weaker. According to NPSS signal The error of the resulting timing offset estimate is also relatively high

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