Method and apparatus for receiving, by terminal, data on unlicensed band
Provided are a method for receiving, by a terminal, data on an unlicensed band in a wireless communication system, and an apparatus for supporting the same. The terminal receives, from a base station, a first indicator which indicates existence of data to be transmitted to the terminal; receives a timer value from the base station; performs channel sensing in a section where a timer operates; and can transmit, to the base station on the basis of the result of performing channel sensing, either one of a second indicator, which indicates that reception of data is possible, and a third indicator, which indicates that reception of data is impossible.
1. A method of transmitting information by a user equipment (UE) on an unlicensed band in a wireless communication system, the method comprising:
receiving, from a base station (BS), first information indicating whether there is data to be transmitted to the UE;
receiving, from the BS, second information informing the UE whether transmission of third information is necessary;
receiving a timer value from the BS;
performing channel sensing in a duration in which a timer runs; and
transmitting, to the BS, either the third information or fourth information based on a result of the channel sensing,
wherein the third information informs the BS that it is possible for the UE to receive data, and
wherein the fourth information informs the BS that it is impossible for the UE to receive the data.
2. The method of claim 1 , further comprising:
transmitting, by the UE to the BS, the third information when the UE determines that a channel is not in use as the result of performing the channel sensing.
3. The method of claim 2 , wherein the third information is transmitted by using at least one of a WLAN module or an LTE module.
4. The method of claim 1 , wherein the third information is transmitted only when the second information informs the UE that transmission of the third information is necessary.
5. The method of claim 1 , wherein the second information is received via at least one of a WLAN or an LTE cell.
6. The method of claim 1 , further comprising:
receiving, by the UE from the BS, data via an SCell on the unlicensed band in response to the third information.
7. The method of claim 1 , further comprising:
transmitting, by the UE to the BS, the fourth information when the UE determines that a channel is in use as the result of the channel sensing.
8. The method of claim 7 ,
wherein the timer is initiated after the UE receives the first information, and
wherein the initiated timer expires after an amount of time, defined by the timer value, elapses.
9. The method of claim 8 , wherein the fourth information is transmitted after the timer expires.
10. The method of claim 9 , wherein the fourth information is transmitted to the BS by using an LTE module via an LTE cell on an unlicensed frequency or a licensed frequency.
11. The method of claim 7 , further comprising:
receiving, by the UE from the BS, fifth information indicating whether there is data to be transmitted to the UE in response to the fourth information, wherein a receiver address of the first information and a receiver address of the fifth information are different from each other.
12. The method of claim 7 , wherein the third information is not transmitted to the BS.
13. The method of claim 1 , wherein the first information is received in at least one of an RRC message, a MAC control element, or a PDCCH.
14. A user equipment (UE) for transmitting information on an unlicensed band in a wireless communication system, the UE comprising:
a memory; a transceiver; and a processor operatively coupled to the memory and the transceiver, wherein the processor is configured to:
control the transceiver to receive, from a base station (BS), first information indicating whether there is data to be transmitted to the UE;
control the transceiver to receive, from the BS, second information informing the UE whether transmission of third information is necessary;
control the transceiver to receive a timer value from the BS;
perform channel sensing in a duration in which a timer runs; and
control the transceiver to transmit, to the BS, either the third information or fourth information based on a result of channel sensing,
wherein the third information informs the BS that it is possible for the UE to receive data, and
wherein the fourth information informs the BS that it is impossible for the UE to receive the data.