Method and device for determining symbol position of primary synchronization signal

Abstract

Disclosed in an embodiment of the present invention is a method for determining a symbol position of a primary synchronization signal, comprising: performing processing on a received radio-frequency signal to obtain a digital baseband signal, and performing sampling on the digital baseband signal to obtain a sampled signal; performing processing on the sampled signal to obtain cumulative power values of the sampled signal over K subframes; determining, according to a preset rule, a first cumulative power value from the cumulative power values of the sampled signal over the K subframes, and determining a subframe position corresponding to the first cumulative power value to be a subframe position of a narrow band primary synchronization signal (NPSS); performing, according to the subframe position of the NPSS, a correlation operation on a pre-configured NPSS and the sampled signal to obtain respective correlation values; and determining, according to the respective correlation values, a symbol position of the NPSS. Also disclosed in the embodiment of the present invention are a device for determining a symbol position of a primary synchronization signal and a computer readable storage medium.

Description

technical field [0001] The present invention relates to the field of the Internet of Things, in particular to a method and device for determining symbol positions of a master synchronization signal. Background technique [0002] Narrow Band Internet of Things (NB-IoT, Narrow Band Internet of Things) is an emerging technology in the field of Internet of Things (IoT, Internet of Things). Different from the existing IoT technology, it is based on the telecommunications cellular network and can be used globally. General Internet of Things technology; NB-IoT uses the license (License) frequency band, which can be deployed in three ways: in-band, guard band or independent carrier, coexisting with the existing network, with wide coverage, deep coverage, massive connections, low cost, Low power consumption, data security and other advantages. [0003] Like other cellular communication technologies, the first step of NB-IoT communication work is to complete the initial synchronizati...

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Problems solved by technology

[0003] Like other cellular communication technologies, the first step of NB-IoT communication work is to complete the initial synchronization process between the terminal and the system, including obtaining time synchronization and frequency synchronization, which can be obtained through the frequency scanning and main synchronization process of the terminal. In some primary synchronization methods, the terminal constructs the primary synchronization signal locally, and uses the correlation of the primary synchronization sequence to compare the received signal (base station transmitted signal) at each time point. The time point where the signal with high correlation is located is considered the primary synchronization signal. Synchronization time point. According to this idea, NB-IoT can also use the correlation evaluation between its narrowband primary synchronization signal (NPSS, Narrow Band Primary Synchronization Signal) and the received signal to obtain primary synchronization. However, in the absence of any prior information Under this circumstance, this method needs to traverse all possible time points in a wireless frame (10ms), whether it is correlated in the time domain or the frequency domain, this method will consume a large amount of hardware resources or digital signal processor (DSP, DigitalSignal Processor ) resources, and uninterrupted continuous reception of signals and operations, unable to reduce power consumption

[0004] However, NB-IoT has very high requirements on cost and power consumption. According to the simulation data of TR45.820, it is expected that the standby time of the terminal module can be as long as 10 years, and a single connected module does not exceed US$5. In order to reduce costs, it is possible to The use of a low-performance crystal oscillator will bring a larger initial frequency offset (up to 25.5KHz) between the terminal and the system than the previous cellular communication system, which will affect the acquisition of initial timing. It can be seen from this that the current Some master synchronization methods cannot meet the requirements of NB-IoT for low cost and low power consumption

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