Data receiving method and apparatus supporting expansion modulation scheme
Provided are a data receiving method supporting an expansion modulation scheme and a wireless device using the same. The wireless device receives expansion sub-frame information indicating at least one expansion sub-frame supporting the expansion modulation scheme among a plurality of sub-frames and receives downlink data according to the expansion sub-frame information.
1. A method for receiving data in a wireless communication system, the method comprising:
receiving, by a wireless device, expansion subframe information indicating at least one expansion subframe in which an expansion modulation scheme is supported among a plurality of subframes;
receiving, by the wireless device, downlink control information including a modulation and coding scheme (MCS) field on a downlink control channel,
wherein the downlink control information schedules a downlink shared channel;
determining, by the wireless device, a modulation order based on the received MCS field,
wherein a first modulation order is determined when the expansion subframe information is configured, and a second modulation order is determined when the expansion subframe information is not configured; and
receiving, by the wireless device, downlink data on the downlink shared channel using the determined modulation order.
2. The method of claim 1 , wherein the expansion subframe information is specific parameter configured by a higher layer.
3. The method of claim 1 , wherein the MCS field has different bit numbers in the expansion subframe and the non-expansion subframe.
4. The method of claim 1 , wherein the MCS field has a same bit number in the expansion subframe and the non-expansion subframe.
5. The method of claim 1 , wherein the expansion subframe supports a modulation scheme that has modulation order of 8, and non-expansion subframe, which is not the expansion subframe among the plurality of subframes, has a modulation order of less than 8.
6. The method of claim 1 , wherein the expansion modulation scheme includes 256-quadrature amplitude modulation (QAM).
7. The method of claim 1 , wherein the expansion subframe information includes information on a plurality of expansion frame sets, and each of the MCS tables is defined for each of the plurality of expansion frame sets.
8. The method of claim 7 , wherein at least one of the MCS tables for the plurality of expansion frame sets is an expansion MCS table including the expansion modulation scheme, and
wherein a channel quality indicator (CQI) table related to the expansion MCS table includes the expansion modulation scheme.
9. The method of claim 1 , wherein the downlink data is received on a physical downlink shared channel (PDSCH) using the determined modulation order.
10. A wireless device in a wireless communication system, the wireless device comprising:
a transceiver configured to transmit and receive a radio signal; and
a processor connected to the transceiver,
wherein the processor is configured to:
receive expansion subframe information indicating at least one expansion subframe in which an expansion modulation scheme is supported among a plurality of subframes through the transceiver;
receive downlink control information including a modulation and coding scheme (MCS) field on a downlink control channel,
wherein the downlink control information schedules a downlink shared channel;
determine a modulation order based on the received MCS field,
wherein a first modulation order is determined when the expansion subframe information is configured, and a second modulation order is determined when the expansion subframe information is not configured; and
receive downlink data on the downlink shared channel using the determined modulation order.
11. The wireless device of claim 10 , wherein the expansion subframe information is specific parameter configured by a higher layer.
12. The wireless device of claim 10 , wherein the MCS field has different bit numbers in the expansion subframe and the non-expansion subframe.
13. The wireless device of claim 10 , wherein the MCS field has a same bit number in the expansion subframe and the non-expansion subframe.
14. The wireless device of claim 10 , wherein the expansion subframe supports a modulation scheme that has modulation order of 8, and non-expansion subframe, which is not the expansion subframe among the plurality of subframes, has a modulation order of less than 8.
15. The wireless device of claim 10 , wherein the expansion modulation scheme includes 256-quadrature amplitude modulation (QAM).
16. The wireless device of claim 10 , wherein the expansion subframe information includes information on a plurality of expansion frame sets, and each of the MCS tables is defined for each of the plurality of expansion frame sets.
17. The wireless device of claim 16 , wherein at least one of the MCS tables for the plurality of expansion frame sets is an expansion MCS table including the expansion modulation scheme, and
wherein a channel quality indicator (CQI) table related to the expansion MCS table includes the expansion modulation scheme.
18. The wireless device of claim 10 , wherein the downlink data is received on a physical downlink shared channel (PDSCH) using the determined modulation order.