Methods and apparatuses for transmitting and receiving reference signal, base station and user equipment

A method of receiving a reference signal, being applied to user equipment (UE), and comprising:

• receiving a reference signal from a base station at a current candidate transmission position among a plurality of candidate transmission positions, wherein the plurality of candidate transmission positions comprise an initial candidate transmission position, and the plurality of candidate transmission positions are obtained by overall shifting signals comprised in the reference signal from the initial candidate transmission position of the reference signal in a time domain;
• obtaining all signals in the reference signal by detecting a target signal in the reference signal;
• obtaining a reference signal index corresponding to the initial candidate transmission position of the reference signal and an offset between the current candidate transmission position of the reference signal and the initial candidate transmission position by demodulating all the signals in the reference signal;
• and
• performing synchronization in a time domain with the base station according to the reference signal index and the offset;
• wherein the plurality of candidate transmission positions being obtained by overall shifting the signals comprised in the reference signal from the initial candidate transmission position of the reference signal in the time domain comprises:
• overall shifting, with respect to the initial candidate transmission position of the reference signal, the signals comprised in the reference signal forward by N symbols or backward by M symbols in the time domain, wherein M and N are integer values greater than or equal to 0 and less than or equal to 8.

A base station, comprising:

• a processor, and
• memory for storing instructions executable by the processor;
• wherein, the processor is configured to:
• obtain a plurality of candidate transmission positions of a reference signal according to an initial candidate transmission position of the reference signal, wherein the plurality of candidate transmission positions comprise the initial candidate transmission position;
• perform a channel detection before the reference signal is transmitted;
• and
• in response to a detection that the channel is idle, transmit the reference signal at a corresponding candidate transmission position, wherein reference signal position information carried by the reference signal comprises a reference signal index corresponding to the initial candidate transmission position and an offset between a current candidate transmission position and the initial candidate transmission position;
• wherein the obtaining the plurality of candidate transmission positions of the reference signal according to the initial candidate transmission position of the reference signal comprises:
• obtaining the plurality of candidate transmission positions by overall shifting signals comprised in the reference signal from the initial candidate transmission position of the reference signal in a time domain;
• wherein the obtaining the plurality of candidate transmission positions by overall shifting the signals comprised in the reference signal from the initial candidate transmission position of the reference signal in the time domain comprises:
• overall shifting, with respect to the initial candidate transmission position of the reference signal, the signals comprised in the reference signal forward by N symbols or backward by M symbols in the time domain, wherein M and N are integer values greater than or equal to 0 and less than or equal to 8.

User equipment, comprising:

• a processor, and
• memory for storing instructions executable by the processor;
• wherein, the processor is configured to:
• receive a reference signal from a base station at a current candidate transmission position among a plurality of candidate transmission positions, wherein the plurality of candidate transmission positions comprise an initial candidate transmission position, and the plurality of candidate transmission positions are obtained by overall shifting signals comprised in the reference signal from the initial candidate transmission position of the reference signal in a time domain;
• obtain all signals in the reference signal by detecting a target signal in the reference signal;
• obtain a reference signal index corresponding to the initial candidate transmission position of the reference signal and an offset between the current candidate transmission position of the reference signal and the initial candidate transmission position by demodulating all the signals in the reference signal;
• and
• perform synchronization in a time domain with the base station according to the reference signal index and the offset;
• wherein the plurality of candidate transmission positions is obtained by overall shifting the signals comprised in the reference signal from the initial candidate transmission position of the reference signal in the time domain comprises:
• overall shift, with respect to the initial candidate transmission position of the reference signal, the signals comprised in the reference signal forward by N symbols or backward by M symbols in the time domain, wherein M and N are integer values greater than or equal to 0 and less than or equal to 8.