Downlink signal reception method, user equipment, downlink signal transmission method and base station
Provided are method and device for transmitting/receiving a downlink signal. A user equipment-specific reference signal (UE-RS) can be transmitted to a user equipment. A downlink control channel and a downlink data channel for the user equipment can share the UE-RS. Antenna port information about a transmission antenna port of the downlink control channel and/or a transmission antenna port of the downlink data channel is provided to the user equipment. The user equipment receives UE-RS(s) corresponding to the antenna port information and thus receives the downlink control channel and the downlink data channel.
1. A method for receiving a downlink signal by a user equipment (UE), the method comprising:
receiving UE-specific reference signals (UE-RSs) for antenna ports p 0 to p N−1 within a transmission time interval (TTI); and
receiving, in one of a plurality of short TTIs (sTTIs) configured in the TTI, a first downlink control channel and a first downlink data channel corresponding to the first downlink control channel, based on the UE-RSs,
wherein the first downlink data channel is received based on the antenna ports p 0 to p N−1 , and
wherein the first downlink control channel is received through L antenna ports with L highest antenna port indexes among the antenna ports p 0 to p N−1 , where N is an integer larger than 1, and L is a positive integer smaller than N.
2. The method according to claim 1 , wherein the TTI is a subframe having a duration of lms.
3. The method according to claim 1 , wherein a predetermined number of antenna ports is equal to 1 in a state in which the first downlink control channel is received in a localized mode, and the predetermined number of antenna ports is equal to 2 in a state in which the first downlink control channel is received in a distributed mode.
4. A user equipment (UE) for receiving a downlink signal, the UE comprising:
a radio frequency (RF) transceiver; and
a processor connected to the RF transceiver,
wherein the processor is configured to:
control the RF transceiver to receive UE-specific signals (UE-RSs) for antenna ports p 0 to p N−1 within a transmission time interval (TTI); and
control the RF transceiver to receive, in one of a plurality of short TTIs (sTTIs) configured in the TTI, a first downlink control channel and a first downlink data channel corresponding to the first downlink control channel, based on the UE-RSs, and
wherein the first downlink data channel is received based on the antenna ports p 0 to p N−1 , and
wherein the first downlink control channel is received through L antenna ports with L highest antenna port indexes among the antenna ports p 0 to p N−1 , where N is an integer larger than 1, and L is a positive integer smaller than N.
5. The UE according to claim 4 , wherein the TTI is a subframe having a duration of 1 ms.
6. The UE according to claim 4 , wherein a predetermined number of antenna ports is equal to 1 in a state in which the first downlink control channel is received in a localized mode, and the predetermined number of antenna ports is equal to 2 in a state in which the first downlink control channel is received in a distributed mode.
7. A method for transmitting a downlink signal by a base station (BS), the method comprising:
transmitting, to a user equipment (UE), UE-specific reference signals (UE-RSs) for antenna ports p 0 to p N−1 within a transmission time interval (TTI); and
transmitting, in one of a plurality of short TTIs (sTTIs) configured in the TTI, a first downlink control channel and a first downlink data channel corresponding to the first downlink control channel, based on the UE-RSs,
wherein the first downlink data channel is transmitted based on the antenna ports p 0 to p N−1 , and
wherein the first downlink control channel is transmitted through L antenna ports with L highest antenna port indexes among the antenna ports p 0 to p N−1 , where N is an integer larger than 1, and L is a positive integer smaller than N.
8. The method according to claim 7 , wherein the TTI is a subframe having a duration of 1 ms.
9. The method according to claim 7 , wherein a predetermined number of antenna ports is equal to 1 in a state in which the first downlink control channel is transmitted in a localized mode, and the predetermined number of antenna ports is equal to 2 in a state in which the first downlink control channel is transmitted in a distributed mode.
10. A base station (B S) for transmitting a downlink signal, the B S comprising:
a radio frequency (RF) transceiver; and
a processor connected to the RF transceiver,
wherein the processor is configured to:
control the RF transceiver to transmit, to a user equipment (UE), UE-specific reference signals (UE-RSs) for antenna ports p 0 to p N−1 within a transmission time interval (TTI); and
control the RF transceiver to transmit, in one of a plurality of short TTIs (sTTIs) configured in the TTI, a first downlink control channel and a first downlink data channel corresponding to the first downlink control channel, based on the UE-RSs, and
wherein the first downlink data channel is transmitted based on the antenna ports p 0 to p N−1 , and
wherein the first downlink control channel is transmitted through L antenna ports with L highest antenna port indexes among the antenna ports p 0 to p N−1 , where N is an integer larger than 1, and L is a positive integer smaller than N.
11. The BS according to claim 10 , wherein a predetermined number of antenna ports is equal to 1 in a state in which the first downlink control channel is transmitted in a localized mode, and the predetermined number of antenna ports is equal to 2 in a state in which the first downlink control channel is transmitted in a distributed mode.