Unlicensed spectrum-based data transmission method and device

Abstract

The invention provides an unlicensed spectrum-based data transmission method and device. The unlicensed spectrum-based data transmission method includes the following steps that: an uplink scheduling command transmitted by a base station is received; frequency resources on an unlicensed spectrum which are allocated for a terminal by the base station are determined; whether a channel on the frequency resources is idle is detected; and when it is detected that the channel on the frequency resources is idle, the channel on the frequency resources is continuously occupied to transmit uplink data to the base station. With the unlicensed spectrum-based data transmission method provided by the technical schemes of the invention adopted, the channel of the unlicensed spectrum is continuously occupied to transmit the uplink data when it is detected that the channel of the unlicensed spectrum is idle, and therefore, detection time of the channel of the unlicensed spectrum can be decreased, and the utilization rate of the channel of the unlicensed spectrum in an uplink transmission process can be improved for the terminal, and the transmission efficiency of the uplink data can be also improved.

Description

technical field [0001] The present invention relates to the field of communication technologies, and in particular, to a data transmission method based on an unlicensed spectrum and a data transmission device based on an unlicensed spectrum. Background technique [0002] The 3GPP standards organization approved the LAA (Licensed-Assisted Access, Assisted Access) research project based on LTE (Long Term Evolution, Long Term Evolution) in the TSGRAN#65 plenary meeting. This project mainly studies how to deploy LTE networks on unlicensed spectrum. , so as to achieve the purpose of using the unlicensed spectrum fairly and effectively and improving the data transmission rate of the LTE system. [0003] There are two ways for LTE to use unlicensed spectrum, one is: use unlicensed spectrum only for downlink data transmission; the other is: unlicensed spectrum can be used for both uplink and downlink data transmission, and the The time division multiplexing method is on the same un...

AI Technical Summary

Problems solved by technology

[0005] When the terminal needs to transmit data through the unlicensed spectrum, if the dynamic scheduling method in the current LTE system is applied to the LAA system of the unlicensed spectrum, the utilization rate of the uplink spectrum of the terminal will be reduced. After receiving the UL-grant instruction from the eNodeB, it is necessary to perform CCA detection on the frequency resource indicated by the UL-grant first, and the frequency resource can only be occupied when the channel is detected to be idle

The CCA detection also needs to occupy a certain amount of time resources. For example, in the LBE (Load based equipment) method commonly used in CCA detection, the time spent on channel detection is often as high as hundreds of microseconds. If the current LTE system is still used In the dynamic scheduling mode, the terminal can only send data for 1 millisecond each time it receives a UL-grant, and the channel utilization rate will be very low

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