Data synchronization method, synchronization system, equipment having base station functions and terminal

Abstract

The invention provides a data synchronization method for an LTE (Long Term Evolution) system working under a time division duplex mode at an unlicensed frequency band, a data synchronization system for the LTE system working under the time division duplex mode at the unlicensed frequency band, equipment having base station functions and a terminal. The data synchronization method for the LTE system working under the time division duplex mode at the unlicensed frequency band comprises that a downlink channel detection subframe which is arranged inside a time division duplex mode frame structure and used for periodically detecting whether the downlink channel at the unlicensed frequency band is free or not sends a first reference signal when detects that the downlink channel is busy at any detection period to enable the equipment having the base station functions and the terminal of a current community in which the equipment having the base station functions is arranged to keep data synchronization. According to the technical scheme, the data synchronization between the equipment having the base station function and the terminal is guaranteed and the equipment having the base station function and the terminal are avoided from losing touch under the premise that the LTE system utilizes an LBT (Listen Before Talk) detection mechanism.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular, to a data synchronization method when an LTE system works in a time-division duplex mode in an unlicensed frequency band, and a data synchronization method when an LTE system works in a time-division duplex mode in an unlicensed frequency band A system, a device having a base station function, and a terminal. Background technique [0002] With the rapid increase of communication traffic, the authorized spectrum of 3GPP is increasingly insufficient to provide higher network capacity. In order to further improve the utilization of spectrum resources, 3GPP is discussing how to use unlicensed spectrum, such as 2.4GHz and 5GHz frequency bands, with the help of licensed spectrum. These unlicensed spectrums are currently mainly used by Wi-Fi, Bluetooth, radar, medical and other systems. [0003] Usually, access technologies designed for licensed frequency bands, such as L...

AI Technical Summary

Problems solved by technology

As a result, if a device with a base station function in an LTE cell (cell) using an unlicensed spectrum, its downlink LBT detects that the downlink channel is busy within a period of time, it will not send any signal, and the terminal cannot detect it at this time. The device with the base station function may not be able to keep in sync with the device with the base station function, resulting in that the device with the base station function cannot be used rationally or cannot achieve data synchronization with the terminal that has established contact, resulting in a connection interruption; similarly, if For a terminal using unlicensed spectrum, if its uplink LBT detects that the uplink channel is busy for a period of time, the terminal will not send any signal, so that the equipment with base station function cannot obtain the synchronization status of the terminal, and cannot adjust the timing advance of the terminal. (time advance), while losing synchronization with the terminal

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