Method and device for configuring transmission opportunity period in wireless access system supporting unlicensed band
The present disclosure relates to a wireless access system supporting an unlicensed band, and provides a method for configuring a transmission opportunity period (TxOP) and devices for supporting the same. The method for configuring a TxOP in a wireless access system supporting an unlicensed band, according to one embodiment of the present disclosure, can comprise the steps of: performing a carrier sensing step for checking whether a secondary cell (SCell) constituted in an unlicensed band is in an idle state; transmitting a reservation signal for a predetermined amount of time if the SCell is in the idle state; and configuring a TxOP in the SCell. At this time, a start point of a first subframe (SF) included in the TxOP can be matched to a subframe, a slot or symbol boundary of a primary cell (PCell) constituted in a licensed band.
1. A method for performing a downlink transmission in a wireless access system supporting an unlicensed band, the method comprising:
performing a carrier sensing procedure for checking whether a secondary cell (Scell) configured in the unlicensed band is idle or not; and
performing the downlink transmission during a downlink transmission duration after the Scell has been checked as idle,
wherein the downlink transmission duration is configured with one or more consecutive subframes (SFs),
wherein a last SF of the downlink transmission duration is a small SF which is smaller than a full SF, and
wherein the small SF is configured according to one of DwPTS (Downlink Pilot Time Slot) configurations.
2. The method according to claim 1 , wherein the full SF includes two slots and one of the two slots includes seven symbols.
3. The method according to claim 2 , wherein a first SF of the downlink transmission duration starts from predetermined symbol boundary within a subframe, and a size of the first SF is equal to or smaller than the full SF.
4. The method according to claim 2 , wherein a location of a subframe and a symbol within the downlink transmission duration is configured to match with a boundary of a subframe and a symbol of a primary cell (Pcell) of a licensed band.
5. The method according to claim 2 , wherein the DwPTS configuration is defined as Table 1,
TABLE 1
Normal cyclic prefix in downlink
Special
UpPTS
subframe
Normal cyclic prefix
Extended cyclic prefix
configuration
DwPTS
in uplink
in uplink
0
6592 · T s
2192 · T s
2560 · T s
1
19760 · T s
2
21952 · T s
3
24144 · T s
4
26336 · T s
5
6592 · T s
4384 · T s
5120 · T s .
6
19760 · T s
7
21952 · T s
8
24144 · T s
9
13168 · T s
6. An enhanced Node B (eNB) for performing a downlink transmission in a wireless access system supporting an unlicensed band, the eNB comprising:
a receiver;
a transmitter; and
a processor supporting the downlink transmission,
wherein the processor is configured to:
perform, by controlling the receiver, a carrier sensing procedure for checking whether a secondary cell (Scell) configured in the unlicensed band is idle or not; and
perform, by controlling the transmitter, the downlink transmission during a downlink transmission duration after the Scell has been checked as idle,
wherein the downlink transmission duration is configured with one or more consecutive subframes (SFs),
wherein a last SF of the downlink transmission duration is a small SF which is smaller than a full SF, and
wherein the small SF is configured according to one of DwPTS (Downlink Pilot Time Slot) configurations.
7. The eNB according to claim 6 , wherein the full SF includes two slots and one of the two slots includes seven symbols.
8. The eNB according to claim 7 , wherein a first SF of the downlink transmission duration starts from predetermined symbol boundary within a subframe, and a size of the first SF is equal to or smaller than the full SF.
9. The eNB according to claim 7 , wherein a location of a subframe and a symbol within the downlink transmission duration is configured to match with a boundary of a subframe and a symbol of a primary cell (Pcell) of a licensed band.
10. The eNB according to claim 7 , wherein the DwPTS configuration is defined as Table 1,
TABLE 1
Normal cyclic prefix in downlink
Special
UpPTS
subframe
Normal cyclic prefix
Extended cyclic prefix
configuration
DwPTS
in uplink
in uplink
0
6592 · T s
2192 · T s
2560 · T s
1
19760 · T s
2
21952 · T s
3
24144 · T s
4
26336 · T s
5
6592 · T s
4384 · T s
5120 · T s .
6
19760 · T s
7
21952 · T s
8
24144 · T s
9
13168 · T s