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Cell search method and system based on narrowband internet of things protocol

A narrow-band Internet of Things and cell search technology, applied in the field of cell search methods and systems based on narrow-band Internet of Things protocols, to achieve strong practicability, reduce the impact of white noise, and high accuracy

Active Publication Date: 2019-08-27
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

However, NB-IoT does not have cell grouping technology, and the generation of synchronization signals is also different from LTE

Method used

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  • Cell search method and system based on narrowband internet of things protocol
  • Cell search method and system based on narrowband internet of things protocol
  • Cell search method and system based on narrowband internet of things protocol

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Embodiment Construction

[0057] Based on the NB-IoT technology without cell grouping, the generation of synchronization signals has different technical issues from LTE. In the NB-IoT downlink receiver system, the cell ID value of the received signal is obtained by detecting the secondary synchronization signal (NSSS) in the subframe of the signal frame. The basic working method of the present invention is to use the received auxiliary synchronization signal to correlate with the stored auxiliary synchronization signal. When the cell ID value of the stored signal is the same as the cell ID value of the received signal frame, the correlation is strongest and the conjugate phase The multiplied modulus is the largest. Therefore, the present invention provides a cell search method based on the narrowband Internet of Things protocol. By performing correlation calculations between the actual auxiliary synchronization signal and the predetermined auxiliary synchronization signal, and performing a modulo operat...

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Abstract

The invention provides a cell searching method based on a narrow-band Internet of things (IoT) protocol. The method comprises the steps of processing an original signal to acquire an actual auxiliarysynchronization signal; performing correlation operation on the actual auxiliary synchronization signal and a predetermined auxiliary synchronization signal according to different cell ID values to acquire different correlation results; and performing modulus operation on the different correlation results to acquire different modulus results, and determining the cell ID value corresponding to themaximum modulus result. In addition, the invention also provides a cell searching system based on the narrow-band IoT protocol. According to the method and the system provided by the invention, the position of a receiving end has received the original signal can be accurately positioned by determining the cell ID value, the problems that cell search difficulty is large and operation is complex under the condition that NB-IoT cells are not grouped are solved, and factors of residual time deviation and uncertainty of odd or even frames are considered, and relatively strong practicability is provided.

Description

Technical field [0001] The invention relates to the field of Internet of Things communication, in particular to a cell search method and system based on a narrowband Internet of Things protocol. Background technique [0002] With the advent of the era of smart cities and big data, wireless communication will realize the connection of all things. Many companies predict that the number of global Internet of Things connections will be hundreds of billions in the future. At present, there have been a large number of connections between things, but most of these connections are carried by short-distance communication technologies such as Bluetooth and Wi-Fi, and are non-operator mobile networks. In order to meet the needs of different IoT services, 3GPP has developed NB-IoT based on the application scenarios of narrowband services based on the features of IoT services and mobile communication networks to meet the booming IoT service requirements. [0003] One of the foundations for th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J11/00
Inventor 陈硕李宇林福江
Owner UNIV OF SCI & TECH OF CHINA
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