Method for transmitting and receiving uplink signal and apparatus supporting method in wireless communication system supporting non-licensed band
Disclosed are a method for a terminal for transmitting and receiving an uplink signal between a base station and a terminal, and an apparatus supporting the method in a licensed assisted access (LAA) system in which a base station or a terminal transmits listen-before-talk (LBT)-based signals. Specifically, the present invention discloses a method for a terminal for transmitting uplink data to a base station, a method for transmitting a modulated reference signal for the uplink data, and an apparatus for supporting the methods.
1. A method of transmitting an uplink signal, which is transmitted by a user equipment (UE) to a base station in a wireless communication system supporting an unlicensed band, the method comprising:
transmitting an uplink data on a first time interval comprising two second time intervals,
wherein each of the second time intervals comprises two third time intervals distinguished from each other based on a symbol in which a demodulation reference signal is transmitted, and
wherein the uplink data is transmitted via frequency resources different from each other in the two third time intervals included in each of the second time intervals; and
transmitting a demodulation reference signal on the symbol in which the demodulation reference signal is transmitted in each of the second time intervals,
wherein a frequency resource in which the demodulation reference signal is transmitted in each of the second time intervals is determined based on a frequency resource in which the uplink data is transmitted in each of the second time intervals,
wherein the frequency resource in which the demodulation reference signal is transmitted in each of the second time intervals corresponds to a partial frequency band among a system bandwidth, and
wherein the uplink data is transmitted in a manner of being spanned over the system bandwidth with a ratio equal to or greater than a prescribed ratio in the first time interval.
2. The method of claim 1 , wherein the system bandwidth comprises a plurality of subbands, and
wherein the uplink data is transmitted via different subbands in each of the third time intervals in each of the second time intervals.
3. The method of claim 2 , wherein the demodulation reference signal in each of the second time intervals is transmitted via a frequency resource identical to the frequency resource in which the uplink data in each of the second time intervals is transmitted.
4. The method of claim 1 , wherein the system bandwidth comprises a plurality of subbands, and
wherein the uplink data is transmitted via a partial frequency band among subbands different from each other per each of the third time intervals in each of the second time intervals.
5. The method of claim 4 , wherein the demodulation reference signal in each of the second time intervals is transmitted via a frequency resource identical to one or more subbands containing the frequency resource in which the uplink data in each of the second time intervals is transmitted.
6. The method of claim 1 , wherein the demodulation reference signal in each of the second time intervals is transmitted by power which is boosted according to a ratio of a partial frequency band in which the demodulation reference signal in each of the second time intervals is transmitted among the system bandwidth.
7. The method of claim 1 , wherein when the demodulation reference signal is overlapped with a demodulation reference signal transmitted by a different UE in a time resource and a frequency resource, the demodulation reference signal is distinguished from the demodulation reference signal transmitted by the different UE via an OCC (orthogonal cover code).
8. The method of claim 1 , wherein the uplink data and the demodulation reference signal in each of the second time intervals are transmitted through the unlicensed band.
9. A method of receiving an uplink signal, which is received by a base station from a user equipment (UE) in a wireless communication system supporting an unlicensed band, the method comprising:
receiving an uplink data on a first time interval comprising two second time intervals,
wherein each of the second time intervals comprises two third time intervals distinguished from each other based on a symbol in which a demodulation reference signal is transmitted, and
wherein the uplink data is transmitted via frequency resources different from each other in the two third time intervals included in each of the second time intervals; and
receiving a demodulation reference signal on the symbol in which the demodulation reference signal is transmitted in each of the second time intervals,
wherein a frequency resource in which the demodulation reference signal is transmitted in each of the second time intervals is determined based on a frequency resource in which the uplink data is transmitted in each of the second time intervals,
wherein the frequency resource in which the demodulation reference signal is transmitted in each of the second time intervals corresponds to a partial frequency band among a system bandwidth, and
wherein the uplink data is transmitted in a manner of being spanned over the system bandwidth with a ratio equal to or greater than a prescribed ratio in the first time interval.
10. The method of claim 9 , wherein the system bandwidth comprises a plurality of subbands, and
wherein the uplink data is transmitted via different subbands in each of the third time intervals in each of the second time intervals.
11. The method of claim 10 , wherein the demodulation reference signal in each of the second time intervals is transmitted via a frequency resource identical to the frequency resource in which the uplink data in each of the second time intervals is transmitted.
12. The method of claim 9 , wherein the system bandwidth comprises a plurality of subbands, and
wherein the uplink data is transmitted via a partial frequency band among subbands different from each other per each of the third time intervals in each of the second time intervals.
13. The method of claim 12 , wherein the demodulation reference signal according to a half slot contained in each slot is transmitted via a frequency resource identical to one or more subbands containing the frequency resource in which the uplink data in each of the second time intervals is transmitted.
14. The method of claim 9 , wherein the demodulation reference signal according to a half slot contained in each slot is transmitted by power which is boosted according to a ratio of a partial frequency band in which the demodulation reference signal in each of the second time intervals is transmitted among the system bandwidth.
15. The method of claim 9 , wherein when the demodulation reference signal is overlapped with a demodulation reference signal transmitted by a different UE in a time resource and a frequency resource, the demodulation reference signal is distinguished from the demodulation reference signal transmitted by the different UE via an OCC (orthogonal cover code).
16. The method of claim 9 , wherein the uplink data and the demodulation reference signal in each of the second time intervals are transmitted on the unlicensed band.
17. A user equipment for transmitting an uplink signal to a base station in a wireless communication system supporting an unlicensed band, the user equipment comprising:
a transmitter; and
a processor configured to operate in a manner of being connected with the transmitter, and configured to:
transmit an uplink data on a first time interval comprising two second time intervals,
wherein each of the second time intervals comprises two third time intervals distinguished from each other based on a symbol in which a demodulation reference signal is transmitted, and
wherein the uplink data is transmitted via frequency resources different from each other in the two third time intervals included in each of the second time intervals; and
transmit a demodulation reference signal on the symbol in which the demodulation reference signal is transmitted in each of the second time intervals,
wherein a frequency resource in which the demodulation reference signal is transmitted in each of the second time intervals is determined based on a frequency resource in which the uplink data is transmitted in each of the second time intervals,
wherein the frequency resource in which the demodulation reference signal is transmitted in each of the second time intervals corresponds to a partial frequency band among a system bandwidth, and
wherein the uplink data is transmitted in a manner of being spanned over the system bandwidth with a ratio equal to or greater than a prescribed ratio in the first time interval.
18. A base station for receiving an uplink signal from a user equipment (UE) in a wireless communication system supporting an unlicensed band, the base station comprising:
a receiver; and
a processor configured to operate in a manner of being connected with the receiver, and configured to:
receive an uplink data on a first time interval comprising two second time intervals,
wherein each of the second time intervals comprises two third time intervals distinguished from each other on the basis of a symbol in which a demodulation reference signal is transmitted, and
wherein the uplink data is transmitted via frequency resources different from each other in the two third time intervals included in each of the second time interval; and
receive a demodulation reference signal on the symbol in which the demodulation reference signal is transmitted in each of the second time intervals,
wherein a frequency resource in which the demodulation reference signal is transmitted in each of the second time intervals is determined based on a frequency resource in which the uplink data is transmitted in each of the second time intervals,
wherein the frequency resource in which the demodulation reference signal contained is transmitted in each of the second time intervals corresponds to a partial frequency band among a system bandwidth, and
wherein the uplink data is transmitted in a manner of being spanned over the system bandwidth with a ratio equal to or greater than a prescribed ratio in the first time interval.