Method and apparatus for transmitting and receiving data
Disclosed are a method and an apparatus for transmitting and receiving data. A method for transmitting an uplink comprises the steps of: a terminal receiving periodic channel state information (CSI) configuration information; the terminal determining an uplink subframe according to the periodic CSI configuration information; and the terminal transmitting a periodic CSI through the uplink subframe, wherein the periodic CSI configuration information may include information regarding a period, subframe offset, and a reference cell to which a wireless frame number is applied.
1. A method of an uplink transmission comprising:
receiving, by a user equipment (UE), periodic channel state information (CSI) configuration information;
determining, by the UE, an uplink subframe according to the periodic CSI configuration information; and
transmitting, by the UE, periodic CSI through the uplink subframe,
wherein the periodic CSI configuration information includes information on a period, a subframe offset, and a reference cell to determine a radio frame number,
wherein the uplink subframe is determined based on the subframe offset, the period, the radio frame number corresponding to the reference cell, and a slot number in a radio frame corresponding to the radio frame number,
wherein the periodic CSI configuration information further includes information on a downlink transmission offset,
wherein the reference cell is a first cell or a second cell,
wherein the information on the downlink transmission offset includes information on a difference between downlink transmission sync of the first cell and downlink transmission sync of the second cell, and
wherein the uplink transmission sync of the uplink subframe is determined based on the information on the downlink transmission offset and downlink transmission sync of the reference cell.
2. The method of claim 1 , wherein the information on the downlink transmission offset includes information on an interval between a first orthogonal frequency division multiplexing (OFDM) symbol corresponding to a primary synchronization signal (PSS) or a secondary synchronization signal (SSS) transmitted from the first cell and a second OFDM symbol corresponding to a PSS or an SSS transmitted from the second cell.
3. The method of claim 1 , wherein the first cell is a primary (P)-cell,
wherein the second cell is an secondary (S)-cell,
wherein the first cell and the second cell are carrier-aggregated, and
wherein the second cell is activated by the first cell.
4. The method of claim 1 , wherein a center frequency of the first cell is the same as a center frequency of the second cell, and
wherein a downlink transmission timing of the second cell is delayed by the downlink transmission offset from a downlink transmission timing of the first cell.
5. A user equipment (UE) in a wireless communication system, the UE comprising:
a radio frequency (RF) unit configured to receive a radio signal;
a processor operatively connected with the RF unit and configured to:
receive periodic channel state information (CSI) configuration information,
determine an uplink sub-frame according to the periodic CSI configuration information, and
transmit periodic CSI through the uplink sub-frame,
wherein the periodic CSI configuration information includes information on a period, a sub-frame offset, and a reference cell to determine a radio frame number,
wherein the uplink sub-frame is determined based on the sub-frame offset, the period, the radio frame number corresponding to the reference cell, and a slot number in a radio frame corresponding to the radio frame number,
wherein the periodic CSI configuration information further includes information on a downlink transmission offset,
wherein the reference cell is a first cell or a second cell,
wherein the information on the downlink transmission offset includes information on a difference between downlink transmission sync of the first cell and downlink transmission sync of the second cell, and
wherein the uplink transmission sync of the uplink sub-frame is determined based on the information on the downlink transmission offset and downlink transmission sync of the reference cell.
6. The UE of claim 5 , wherein the information on the downlink transmission offset includes information on an interval between a first orthogonal frequency division multiplexing (OFDM) symbol corresponding to a primary synchronization signal (PSS) or a secondary synchronization signal (SSS) transmitted from the first cell and a second OFDM symbol corresponding to a PSS or an SSS transmitted from the second cell.
7. The UE of claim 5 , wherein the first cell is a primary (P)-cell,
wherein the second cell is an secondary (S)-cell,
wherein the first cell and the second cell are carrier-aggregated, and
wherein the second cell is activated by the first cell.
8. The UE of claim 5 , wherein a center frequency of the first cell is the same as a center frequency of the second cell, and
wherein a downlink transmission timing of the second cell is delayed by the downlink transmission offset from a downlink transmission timing of the first cell.