Transmission method and device for PRACH signals in LTE-U (Long Term Evolution-Unlicensed)

Abstract

The invention discloses a transmission method and device for PRACH (Physical Random Access Channel) signals in LTE-U (Long Term Evolution-Unlicensed). The method and the device are used for enhancing channel access of the PRACH signals. The method comprises the steps that a terminal carries out LBT (Listen before Talk) detection before each candidate resource configured in transmission resources until it is detected that a current channel is idle, according to the configuration information of the transmission resources for transmitting the PRACH signals; and the terminal sends the PRACH signals on the corresponding candidate resources when it is detected that the current channel is idle. According to the method and the device, the plurality of candidate resources are configured in the transmission resources for transmitting the PRACH signals, so when it is detected that the current channel is idle, the terminal can send the PRACH signals on the corresponding candidate resources, the sending probability of the PRACH signals is improved, and the channel access of the PRACH signals is enhanced.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method and equipment for transmitting physical random access channel (Physical Random Access Channel, PRACH) signals in unlicensed spectrum. Background technique [0002] With the continuous growth of mobile data traffic, the spectrum resources are becoming more and more tight. Only using authorized spectrum resources for network deployment and service transmission may not be able to meet the traffic demand. Therefore, the Long Term Evolution (LTE) system can be considered Deploy transmission on unlicensed spectrum resources, that is, Unlicensed LTE (U-LTE or LTE-U for short), to improve user experience and expand coverage. Since there is no specific application system planned for the unlicensed spectrum, it can be shared by multiple wireless communication systems such as Bluetooth and Wireless Fidelity (WIFI). Various wireless communication systems use unlicense...

AI Technical Summary

Problems solved by technology

[0010] Since the terminal must first perform LBT detection when sending the PRACH signal on the unlicensed spectrum, if the current channel is occupied before sending the PRACH signal, the terminal cannot send the PRACH signal on the current channel, and the terminal and the base station cannot establish uplink synchronization. Even if the channel is idle, the base station cannot schedule the terminal to perform uplink transmission on the unlicensed spectrum

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