Method and apparatus for transmitting or receiving sub-frame length information in wireless access system supporting non-licensed band
Embodiments of the present invention relate to a wireless access system supporting a non-licensed band and, more particularly, to methods for transmitting or receiving sub-frame length information indicating the lengths of current and next subframes, and apparatuses for supporting the same. As an embodiment of the present invention, a method for receiving sub-frame (SF) length information in a wireless access system supporting a non-licensed band may comprise the steps of: receiving a signal including first SF length information indicating the lengths of one or more of a current SF and a next SF in sub-frame number n−1 (SF # n−1); and receiving one or more of a downlink physical channel and a downlink signal in the SF # n−1 on the basis of the first SF length information. Here, the first SF length information may indicate that the current SF or the next SF is the end SF of a downlink transmission burst in the non-licensed band.
1. A method of receiving a downlink signal by a user equipment (UE) in a wireless access system supporting an unlicensed band, the method comprising:
receiving, from a base station (BS), a first physical downlink control channel (PDCCH) including first subframe (SF) length information, in a SF # n−1; wherein n is a positive integer number;
receiving, from the BS, a downlink signal based on the first SF length information, and
wherein the first SF length information is used for configuration of the SF # n−1 and a SF # n, and
wherein the first SF length information includes information related to a number of occupied orthogonal frequency division multiplexing (OFDM) symbols of the SF # n−1 and the SF # n, the occupied OFDM symbols are used for reception of the downlink signal.
2. The method according to claim 1 , wherein the first SF length information includes information that the SF # n−1 or the SF # n is an end SF of a downlink transmission burst.
3. The method according to claim 1 , wherein the SF # n−1 is a full SF and, is an end SF of a downlink transmission burst.
4. The method according to claim 1 , wherein the SF # n−1 is a partial SF and, is an end SF of a downlink transmission burst.
5. The method according to claim 1 , further comprising:
receiving, from the BS, a second PDCCH including second SF length information, in the SF # n; and
receiving, from the BS, a downlink signal based on the second SF length information,
wherein the second SF length information is used for configuration of the SF # n and a SF # n+1.
6. A method of transmitting a downlink signal by a base station (BS) in a wireless access system supporting an unlicensed band, the method comprising:
transmitting, to a user equipment (UE), a first physical downlink control channel (PDCCH) including first subframe (SF) length information, in a SF # n−1; wherein n is a positive integer number;
transmitting, to the UE, a downlink signal based on the first SF length information, and
wherein the first SF length information is used for configuration of the SF # n−1 and a SF # n, and
wherein the first SF length information includes information related to a number of occupied orthogonal frequency division multiplexing (OFDM) symbols of the SF # n−1 and the SF # n, the occupied OFDM symbols are used for transmission of the downlink signal.
7. The method according to claim 6 , wherein the first SF length information includes information that the SF # n−1 or the SF # n is an end SF of a downlink transmission burst.
8. The method according to claim 6 , wherein the SF # n−1 is a full SF and, is an end SF of a downlink transmission burst.
9. The method according to claim 6 , wherein the SF # n−1 is a partial SF and, is an end SF of a downlink transmission burst.
10. The method according to claim 6 , further comprising:
transmitting, to the UE, a second PDCCH including second SF length information, in the SF # n; and
transmitting, to the UE, a downlink signal based on the second SF length information,
wherein the second SF length information is used for configuration of the SF # n and a SF # n+1.
11. A user equipment (UE) for receiving a downlink signal in a wireless access system supporting an unlicensed band, the UE comprising:
a receiver; and
at least one processor,
wherein the at least one processor:
controls the receiver to receive, from a base station (BS), a first physical downlink control channel (PDCCH) including first subframe (SF) length information, in a SF # n−1; wherein n is a positive integer number;
controls the receiver to receive, from the BS, a downlink signal based on the first SF length information, and
wherein the first SF length information is used for configuration of the SF # n−1 and a SF # n, and
wherein the first SF length information includes information related to a number of occupied orthogonal frequency division multiplexing (OFDM) symbols of the SF # n−1 and the SF # n, the occupied OFDM symbols are used for reception of the downlink signal.
12. The UE according to claim 11 , wherein the first SF length information includes information that the SF # n−1 or the SF # n is an end SF of a downlink transmission burst.
13. The UE according to claim 11 , wherein the SF # n−1 is a full SF and, is an end SF of a downlink transmission burst.
14. The UE according to claim 11 , wherein the SF # n−1 is partial SF and, is an end SF of a downlink transmission burst.
15. The UE according to claim 11 , wherein the at least one processor controls the receiver to:
receive, from the BS, a second PDCCH including second SF length information, in the SF # n; and
receive, from the BS, a downlink signal based on the second SF length information,
wherein the second SF length information is used for configuration of the SF # n and a SF # n+1.
16. A base station (BS) for transmitting a downlink signal in a wireless access system supporting an unlicensed band, the BS comprising:
a transmitter; and
at least one processor,
wherein the at least one processor controls the transmitter to:
transmit, to a user equipment (UE), a first physical downlink control channel (PDCCH) including first subframe (SF) length information, in a SF # n−1; wherein n is a positive integer number;
transmit, to the UE, a downlink signal based on the first SF length information, and
wherein the first SF length information is used for configuration of the SF # n−1 and a SF # n, and
wherein the first SF length information includes information related to a number of occupied orthogonal frequency division multiplexing (OFDM) symbols of the SF # n−1 and the SF # n, the occupied OFDM symbols are used for transmission of the downlink signal.
17. The BS according to claim 16 , wherein the first SF length information includes information that the SF # n−1 or the SF # n is an end SF of a downlink transmission burst.
18. The BS according to claim 16 , wherein the SF # n−1 is a full SF and, is an end SF of a downlink transmission burst.
19. The BS according to claim 16 , wherein the SF # n−1 is a partial SF and, is an end SF of a downlink transmission burst.
20. The BS according to claim 16 , wherein the at least one processor controls the transmitter to:
transmit, to the UE, a second PDCCH including second SF length information, in the SF # n; and
transmit, to the UE, a downlink signal based on the second SF length information,
wherein the second SF length information is used for configuration of the SF # n and a SF # n+1.