Method and device for transmitting and receiving wireless signal in wireless communication system
The resent invention relates to a wireless communication system, and particularly to a method and device for same, the method including the steps of: receiving, from a base station, L1 information about M number of UCells (M≤N) on which downlink resources are temporarily configured, wherein M number of UCells (M≤N) are a subset of N number of UCells; selectively aggregating K number of UCells (K<M) from among N number of UCells depending on a terminal's cell aggregation capability; and communicating with the base station by using the aggregated K number of UCells.
1. A method of performing communication by a user equipment (UE) in a wireless communication system, the method comprising:
receiving first layer 1 (L1) information related to M (M≤N) number of unlicensed band cells (UCells) to which a downlink resource is temporarily set among N number of UCells from an eNB;
receiving second L1 information related to a maximum number of K of UCells that the UE is able to aggregate;
aggregating all of the M number of UCells, when K is no less than M;
aggregating K number of UCells selected by the UE from the N number of UCells based on a predetermined rule, without an indication from the eNB related to the selected K number of UCells, when K is less than M; and
performing communication with the eNB using the aggregated UCells.
2. The method of claim 1 , wherein the K number of UCells are selected from the M number of UCells as follows:
a UCell having a lower cell index is preferentially selected,
a UCell having a wider system bandwidth is preferentially selected, and
a UCell having a longer downlink resource is preferentially selected.
3. The method of claim 1 , wherein the first and second L1 information are received on a PDCCH (physical downlink control channel).
4. The method of claim 3 , wherein the second L1 information is received on an LCell (licensed band cell), and
wherein the wireless communication system corresponds to a 3GPP (3rd generation partnership project) wireless communication system.
5. A user equipment (UE) configured to perform communication in a wireless communication system, the UE comprising:
a transceiver; and
a processor configured to:
receive first layer 1 (L1) information related to M (M≤N) number of unlicensed band cells (UCells) to which a downlink resource is temporarily set among N number of UCells from an eNB,
receive second L1 information related to a maximum number K of UCells that the UE is able to aggregate,
aggregate all of the M number of UCells, when K is no less than M,
aggregate K number of UCells selected by the UE from the N number of UCells based on a predetermined rule, without an indication from the eNB related to the selected K number of UCells, when K is less than M, and
perform communication with the eNB using the aggregated UCells.
6. The user equipment of claim 5 , wherein the K number of UCells are selected from the M number of UCells as follows:
a UCell having a lower cell index is preferentially selected,
a UCell having a wider system bandwidth is preferentially selected, and
a UCell having a longer downlink resource is preferentially selected.
7. The user equipment of claim 5 , wherein the first and second L1 information are received on a PDCCH (physical downlink control channel).
8. The user equipment of claim 7 , wherein the second L1 information is received on an LCell (licensed band cell), and
wherein the wireless communication system corresponds to a 3GPP (3rd generation partnership project) wireless communication system.