Method and user equipment for receiving downlink signal, method and base station for transmitting downlink signal
A user equipment is provided with puncturing information indicating a resource to which downlink data is punctured among time-frequency resources to which the downlink data is allocated. The user equipment may decode the downlink data received in the time-frequency resource on the basis of the puncturing information. The downlink data may be mapped to the time-frequency resource by a combined method of a time-first resource mapping method and a frequency-first resource mapping method, or by a distributed resource mapping method.
1. A method of receiving downlink information by a wireless device, the method comprising:
monitoring a common search space in a time interval; and
detecting, in the time interval, downlink control information regarding a plurality of orthogonal frequency division multiplexing, OFDM, symbols that are prior to the time interval,
wherein the downlink control information includes information regarding one or more OFDM symbols, in which no downlink transmission to the wireless device is present, among the plurality of OFDM symbols prior to the time interval, and
wherein the downlink control information is detected in a physical downlink control channel on only the common search space in the time interval.
2. The method according to claim 1 ,
wherein the plurality of OFDM symbols are grouped into a plurality of OFDM symbol groups in a time domain,
wherein the information regarding the one or more OFDM symbols in which no downlink transmission to the wireless device is present includes a bitmap having a plurality of bits,
wherein the plurality of bits are corresponding to the plurality of OFDM symbols groups, respectively, and
wherein each of the plurality of bits indicates whether or not downlink transmission to the wireless device is present in a corresponding OFDM symbol group among the plurality of OFDM symbol groups.
3. A wireless device for receiving downlink information, the wireless device comprising:
a radio frequency, RF, transceiver;
a processor; and
a memory storing at least one program that causes the processor to perform operations comprising:
monitoring a common search space in a time interval; and
detecting, in the time interval, downlink control information regarding a plurality of orthogonal frequency division multiplexing, OFDM, symbols that are prior to the time interval,
wherein the downlink control information includes information regarding one or more OFDM symbols, in which no downlink transmission to the wireless device is present, among the plurality of OFDM symbols prior to the time interval, and
wherein the downlink control information is detected in a physical downlink control channel on only the common search space in the time interval.
4. The wireless device according to claim 3 ,
wherein the plurality of OFDM symbols are grouped into a plurality of OFDM symbol groups in a time domain,
wherein the information regarding the one or more OFDM symbols in which no downlink transmission to the wireless device is present includes a bitmap having a plurality of bits,
wherein the plurality of bits corresponds to the plurality of OFDM symbols groups, respectively, and
wherein each of the plurality of bits indicates whether or not downlink transmission to the wireless device is present in a corresponding OFDM symbol group among the plurality of OFDM symbol groups.
5. A base station for transmitting downlink information, the base station comprising:
a radio frequency, RF, transceiver;
a processor; and
a memory storing at least one program that causes the processor to perform operations comprising:
generating downlink control information regarding a plurality of orthogonal frequency division multiplexing, OFDM, symbols that are prior to a time interval; and
transmitting, in the time interval, the downlink control information regarding the plurality of OFDM symbols that are prior to the time interval,
wherein the downlink control information includes information regarding one or more OFDM symbols, in which no downlink transmission to a wireless device is present, among the plurality of OFDM symbols prior to the time interval, and
wherein the downlink control information is conveyed in a physical downlink control channel on only a common search space in the time interval.
6. The base station according to claim 5 ,
wherein the plurality of OFDM symbols are grouped into a plurality of OFDM symbol groups in a time domain,
wherein the information regarding the one or more OFDM symbols in which no downlink transmission to the wireless device is present includes a bitmap having a plurality of bits,
wherein the plurality of bits corresponds to the plurality of OFDM symbols groups, respectively, and
wherein each of the plurality of bits indicates whether or not downlink transmission to the wireless device is present in a corresponding OFDM symbol group among the plurality of OFDM symbol groups.