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 that includes a modulation and coding scheme (MCS) field indicating the expansion modulation scheme on a downlink control channel, in the at least one expansion subframe; and
receiving, by the wireless device, downlink data on a downlink shared channel according to the downlink control information,
wherein the at least one expansion subframe that supports the expansion modulation scheme has a modulation order of 8, and wherein a non-expansion subframe, among the plurality of subframes, has a modulation order of less than 8, and
wherein the expansion modulation scheme includes 256-quadrature amplitude modulation (QAM).
2. The method of claim 1 , wherein the MCS field has different bit numbers in the at least one expansion subframe than in the non-expansion subframe.
3. The method of claim 1 , wherein the MCS field has a same bit number in the at least one expansion subframe than in the non-expansion subframe.
4. The method of claim 3 , wherein MCS tables for the MCS field in the at least one expansion subframe are different than the MCS tables for the MCS field in the non-expansion subframe.
5. The method of claim 1 , wherein the expansion subframe information includes information on a plurality of expansion frame sets, and
wherein MCS table is defined for each of the plurality of expansion frame sets.
6. The method of claim 5 , wherein at least one of a plurality of 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.
7. A wireless device in a wireless communication system, the wireless device comprising:
a receiver; and
a processor connected to the receiver,
wherein the processor controls the receiver to:
receive expansion subframe information indicating at least one expansion subframe, in which an expansion modulation scheme is supported, among a plurality of subframes;
receive downlink control information that includes a modulation and coding scheme (MCS) field indicating the expansion modulation scheme on a downlink control channel, in the at least one expansion subframe; and
receive downlink data on a downlink shared channel according to the downlink control information,
wherein the at least one expansion subframe that supports the expansion modulation scheme has a modulation order of 8, and wherein a non-expansion subframe, among the plurality of subframes, has a modulation order of less than 8, and
wherein the expansion modulation scheme includes 256-quadrature amplitude modulation (QAM).