Method and device for receiving signal in wireless communication system to which multiplex transmission technique is applied
A method and device for receiving a signal in a wireless communication system to which a multiplex transmission technique is applied are provided. The wireless communication system proposed herein suggests a method for increasing the receipt reliability of a terminal with respect to a multiplex transmission activation indicator indicating the start of multiplex transmission. Particularly, a terminal checks the receipt of a multiplex transmission activation indicator transmitted, from a first base station, for every predetermined subframe. If the terminal succeeds in receiving the multiplex transmission activation indicator, an ACK signal associated with the multiplex transmission activation indicator is transmitted to the first base station. Here, the multiplex transmission activation indicator indicates that the first base station and a second base station are capable of transmitting the same data for a predetermined time together.
1. A method for receiving a signal in a wireless communication system applying a multi-path transmission technique, the method comprising:
monitoring reception of a multi-path transmission activation indicator being transmitted from a first base station at each predetermined subframe; and
based on a user equipment (UE) successfully receiving the multi-path transmission activation indicator, transmitting an acknowledgement (ACK) signal for the multi-path transmission activation indicator to the first base station,
wherein the multi-path transmission activation indicator indicates that the first base station and the second base station are capable of transmitting the same data during a predetermined time,
wherein the multi-path transmission activation indicator is transmitted by using a sequence, and
wherein the method further comprises calculating an auto-correlation value of the sequence,
wherein, based on the calculated auto-correlation value of the sequence being equal to or greater than a threshold value, the multi-path transmission activation indicator is acknowledged to be successfully received.
2. The method of claim 1 , wherein control information for transmitting the data is received through the predetermined subframe along with the multi-path transmission activation indicator.
3. The method of claim 2 ,
wherein the predetermined subframe includes a symbol transmitting downlink control information, a symbol transmitting the data, and a symbol transmitting uplink control information,
wherein the multi-path transmission activation indicator and the control information for transmitting the data are received through the symbol transmitting downlink control information, and
wherein an ACK signal for the data and the ACK signal for the multi-path transmission activation indicator are transmitted through the symbol transmitting uplink control information.
4. The method of claim 3 ,
wherein the symbol transmitting downlink control information is configured of at least two Orthogonal Frequency Division Multiplexing (OFDM) symbols, or
wherein the symbol transmitting uplink control information is configured of at least two OFDM symbols.
5. The method of claim 1 , wherein a position of a resource from which an ACK signal for the multi-path transmission activation indicator is transmitted is determined based on an index of the resource from which the multi-path transmission activation indicator is transmitted and a sequence number of the multi-path transmission activation indicator.
6. The method of claim 1 ,
wherein the first base station and the second base station are included in a base station group supporting multi-path transmission, and
wherein the method further comprises:
receiving information on the base station group from the first base station, resource position information of a synchronization signal being transmitted from the first base station, and resource position information of a synchronization signal being transmitted from the second base station; and
synchronizing the first base station and the second base station based on the resource position information of the synchronization signal being transmitted from the first base station and the resource position information of the synchronization signal being transmitted from the second base station.
7. The method of claim 1 , wherein the sequence comprises plural sequences being orthogonal or quasi-orthogonal to one another through a resource being commonly assigned to the first base station and the second base station.
8. The method of claim 1 , further comprising:
based on the UE successfully receiving the multi-path transmission activation indicator, transmitting an ACK signal for the multi-path transmission activation indicator to the second base station.
9. The method of claim 8 , wherein the ACK signal for the multi-path transmission activation indicator is transmitted through resources respectively being assigned to the first base station and the second base station or transmitted through a resource being commonly assigned to the first base station and the second base station.
10. A user equipment (UE) for receiving a signal in a wireless communication system applying a multi-path transmission technique, comprising:
a radio frequency (RF) unit including a transceiver for transmitting and receiving radio signals; and
a processor being operatively connected to the RF unit,
wherein the processor:
monitors reception of a multi-path transmission activation indicator being transmitted from a first base station at each predetermined subframe; and
based on a user equipment (UE) successfully receiving the multi-path transmission activation indicator, transmits an acknowledgement (ACK) signal for the multi-path transmission activation indicator to the first base station,
wherein the multi-path transmission activation indicator indicates that the first base station and the second base station are capable of transmitting the same data during a predetermined time,
wherein the multi-path transmission activation indicator is transmitted by using a sequence,
wherein the processor calculates an auto-correlation value of the sequence, and
wherein, based the calculated auto-correlation value of the sequence being equal to or greater than a threshold value, the multi-path transmission activation indicator is acknowledged to be successfully received.
11. The user equipment of claim 10 , wherein control information for transmitting the data is received through the predetermined subframe along with the multi-path transmission activation indicator.
12. The user equipment of claim 11 ,
wherein the predetermined subframe includes a symbol transmitting downlink control information, a symbol transmitting the data, and a symbol transmitting uplink control information,
wherein the multi-path transmission activation indicator and the control information for transmitting the data are received through the symbol transmitting downlink control information, and
wherein an ACK signal for the data and the ACK signal for the multi-path transmission activation indicator are transmitted through the symbol transmitting uplink control information.
13. The user equipment of claim 12 ,
wherein the symbol transmitting downlink control information is configured of at least two Orthogonal Frequency Division Multiplexing (OFDM) symbols, or
wherein the symbol transmitting uplink control information is configured of at least two OFDM symbols.