Data transmission method and device based on LAA (Licensed-Assisted Access) system

Abstract

The embodiment of the invention discloses a data transmission method based on an LAA (Licensed-Assisted Access) system. The method comprises the following steps: receiving an upload time slot allocated by a base station, wherein at least one upload time slot is allocated; generating a data volume parameter corresponding to a starting moment of the upload time slot; detecting whether an uplink transmission channel of an unauthorized frequency spectrum is occupied or not, and acquiring the data volume parameter corresponding to the starting moment of the upload time slot at the arrival of a first upload time slot after the upload transmission channel is detected to be not occupied; and generating data packets according to the acquired data volume parameter, and uploading the data packets to the base station through the uplink transmission channel of the unauthorized frequency spectrum. The invention also discloses a data transmission device based on the LAA system. Through adoption of the data transmission method and device based on the LAA system, the resource utilization ratio of channel resources can be increased.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a data transmission method and device based on an LAA system. Background technique [0002] With the rapid development of mobile services, the capacity of the existing wireless spectrum allocated to mobile services cannot meet the requirements. In the 3GPP Rel-13 stage, a mechanism called LAA (licensed-assisted access) was introduced. In the LAA mechanism, the transmission of mobile communication can be carried on the unlicensed spectrum, such as the 5GHz frequency band. These unlicensed spectrums are mainly used by WiFi, Bluetooth, radar, medical and other systems at present. [0003] Due to the diversity and complexity of the systems on the unlicensed spectrum, directly applying the LTE mechanism to the unlicensed spectrum cannot guarantee user security and connection stability. Therefore, in the mechanism of LAA, licensed spectrum is used to facilitate access...

AI Technical Summary

Problems solved by technology

In the case of FBE, different sending ends can detect the channel at a relatively fixed time, thereby improving the chance of multiplexing; however, the chance of occupying the spectrum may be less; LBE can be driven by the service to detect the channel at any time, The chance of channel occupation is improved, but it cannot be guaranteed that the sender will occupy the channel at the same time, because the multiplexing of different senders cannot be guaranteed

[0005] That is to say, in the existing LAA system, due to the need to compete for the use of the channel, the moment when the channel is occupied is unpredictable

In order to reasonably allocate channel resources, the base station usually also sets the maximum transmission time for a certain uplink transmission channel, which makes the terminal detect that the uplink transmission channel is idle at certain moments through LBT, and the remaining transmission time for data transmission is relatively short. , resulting in a shorter amount of data that can be transmitted; and at other times when the uplink transmission channel is detected to be idle through LBT, the remaining transmission time available for data transmission is longer, resulting in a shorter amount of data that can be transmitted

Therefore, the channel resource utilization rate of the LAA system in the traditional technology is not high when transmitting data under this channel condition

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