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nbiot terminal clock synchronization method and device

A clock synchronization and terminal technology, applied in synchronization devices, wireless communication, transmission systems, etc., can solve problems such as low cost and cost disadvantages

Active Publication Date: 2021-01-08
BEIJING ZHILIANAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantages of the traditional solution using VCTCXO are also very obvious. VCTCXO is relatively expensive. When used in IoT applications, due to the low overall system cost, the price of VCTCXO becomes a cost disadvantage in this solution.

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  • nbiot terminal clock synchronization method and device

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Embodiment Construction

[0034] In order to understand the above-mentioned purpose, features and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0035] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described here. Therefore, the protection scope of the present invention is not limited by the specific details disclosed below. EXAMPLE LIMITATIONS.

[0036] like figure 1 As shown, a schematic flowchart of a method for clock synchronization of an NBIoT terminal according to an embodiment of the present invention. Among them, the NBIoT terminal a...

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Abstract

The invention provides an NBIoT terminal clock synchronization method and device. The NBIoT terminal clock synchronization method includes the following steps: detecting an NPSS signal and an NSSS signal in a downlink channel; parsing a clock frequency fUE inside an NBIoT terminal and a clock frequency fDL in a downlink signal carrier frequency signal according to the NPSS signal and the NSSS signal, and calculating a difference deltaf between fUE and fDL; resampling signals in all downlink channels received by the NBIoT terminal, and if the difference between a resampling frequency and a current downlink signal carrier frequency is deltaf, switching the resampled downlink signal carrier frequency to the clock frequency inside the NBIoT terminal; and detecting a data signal in an uplink channel, resampling the data signal after the data signal in the uplink channel is generated, and if the difference between the resampling frequency and the clock frequency fUE inside the NBIoT terminalis -deltaf, switching the resampled uplink signal carrier frequency to the clock frequency in the downlink signal carrier frequency signal.

Description

technical field [0001] The present invention relates to the technical field of Internet of Things mobile communication, in particular, to an NBIoT terminal clock synchronization method and an NBIoT terminal clock synchronization device. Background technique [0002] NBIoT (Narrow Band Internet of Things, NB-IoT) is a wireless communication standard for the Internet of Things formulated by 3GPP. NBIoT terminals and base stations are connected wirelessly to upload and download data. Since the communication is carried out wirelessly, in order to ensure the communication quality, the clock references of the terminal and the base station need to be consistent. The base station generally adopts the GPS clock reference, which has very high precision. Due to the limited size and cost on the terminal side, only a crystal clock with low precision can be used. This precision cannot meet the requirements of NBIoT air interface communication. [0003] The traditional solution is to use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W56/00H04L29/08
CPCH04L67/12H04W56/001
Inventor 谢修祥钱炜吕悦川安之平
Owner BEIJING ZHILIANAN TECH