Data transmission method and device in wireless communication system
A method and a user equipment (UE) are provided for transmitting uplink data in a wireless communication system. Uplink data is mapped to resource elements corresponding to a physical uplink shared channel (PUSCH) in a UE-specific aperiodic sounding reference signal (SRS) subframe. The UE-specific aperiodic SRS subframe includes a single carrier frequency division multiple access (SC-FDMA) symbol reserved for an aperiodic SRS. The aperiodic SRS is transmitted in the reserved SC-FDMA symbol when triggered by a base station. The uplink data is not mapped to the SC-FDMA symbol reserved for the aperiodic SRS regardless of whether the aperiodic SRS is transmitted in the reserved SC-FDMA symbol or not. The mapped uplink data is transmitted to the base station via the UE-specific aperiodic SRS subframe.
1. A method for transmitting, by a user equipment (UE), uplink data in a wireless communication system, the method comprising:
mapping uplink data to resource elements corresponding to a physical uplink shared channel (PUSCH) in a UE-specific aperiodic sounding reference signal (SRS) subframe,
wherein the UE-specific aperiodic SRS subframe includes a single carrier frequency division multiple access (SC-FDMA) symbol reserved for an aperiodic SRS,
wherein the aperiodic SRS is selectively transmitted in the reserved SC-FDMA symbol, and the aperiodic SRS is transmitted in the reserved SC-FDMA symbol when triggered by a base station, and
wherein the uplink data is mapped to SC-FDMA symbols other than the SC-FDMA symbol reserved for the aperiodic SRS in the UE-specific aperiodic SRS subframe in a case when the aperiodic SRS is not transmitted in the reserved SC-FDMA symbol; and
transmitting the mapped uplink data to the base station via the UE-specific aperiodic SRS subframe.
2. The method of claim 1 , wherein the aperiodic SRS is transmitted to the base station in the UE-specific aperiodic SRS subframe.
3. The method of claim 1 , wherein the UE-specific aperiodic SRS subframe is one of a plurality of UE-specific subframes configured by a UE-specific aperiodic SRS parameter.
4. The method of claim 3 , wherein the UE-specific aperiodic SRS parameter indicates a periodicity and an offset of the plurality of UE-specific SRS subframes.
5. The method of claim 3 , wherein the UE-specific aperiodic SRS parameter is given by a higher layer.
6. The method of claim 1 , wherein the SC-FDMA symbol reserved for the aperiodic SRS is a last SC-FDMA symbol of the UE-specific aperiodic SRS subframe.
7. The method of claim 1 , wherein the PUSCH is subject to rate matching except the SC-FDMA symbol reserved for the aperiodic SRS, and
wherein the rate matching is performed by determining, by the UE, a number of coded modulation symbols.
8. The method of claim 7 , wherein the number of coded modulation symbols is determined based on a number of SC-FDMA symbols per subframe for the PUSCH.
9. The method of claim 8 , wherein the number of SC-FDMA symbols per subframe for the PUSCH is determined based on Equation:
N symb PUSCH-initial =(2·( N symb UL −1)− N SRS )
where N symb UL denotes a number of SC-FDMA symbols in each slot in the UE-specific aperiodic SRS subframe, and N SRS =1.
10. A user equipment (UE) comprising:
a memory;
a radio frequency (RF) unit; and
a processor coupled to the memory and the RF unit, and configured to:
map uplink data to resource elements corresponding to a physical uplink shared channel (PUSCH) in a UE-specific aperiodic sounding reference signal (SRS) subframe,
wherein the UE-specific aperiodic SRS subframe includes a single carrier frequency division multiple access (SC-FDMA) symbol reserved for an aperiodic SRS,
wherein the aperiodic SRS is selectively transmitted in the reserved SC-FDMA symbol, and the aperiodic SRS is transmitted in the reserved SC-FDMA symbol when triggered by a base station, and
wherein the uplink data is mapped to SC-FMDA symbols other than the SC-FDMA symbol reserved for the aperiodic SRS in the UE-specific aperiodic SRS subframe in a case when the aperiodic SRS is not transmitted in the reserved SC-FDMA symbol, and
control the RF unit to transmit the mapped uplink data to the base station via the UE-specific aperiodic SRS subframe.
11. The UE of claim 10 , wherein the aperiodic SRS is transmitted to the base station in the UE-specific aperiodic SRS subframe.
12. The UE of claim 10 , wherein the UE-specific aperiodic SRS subframe is one of a plurality of UE-specific subframes configured by a UE-specific aperiodic SRS parameter.
13. The UE of claim 12 , wherein the UE-specific aperiodic SRS parameter indicates a periodicity and an offset of the plurality of UE-specific SRS subframes.
14. The UE of claim 12 , wherein the UE-specific aperiodic SRS parameter is given by a higher layer.
15. The UE of claim 10 , wherein the SC-FDMA symbol reserved for the aperiodic SRS is a last SC-FDMA symbol of the UE-specific aperiodic SRS subframe.
16. The UE of claim 10 , wherein the PUSCH is subject to rate matching except the SC-FDMA symbol reserved for the aperiodic SRS, and
wherein the rate matching is performed by determining, by the UE, a number of coded modulation symbols.
17. The UE of claim 16 , wherein the number of coded modulation symbols is determined based on a number of SC-FDMA symbols per subframe for the PUSCH.
18. The UE of claim 17 , wherein the number of SC-FDMA symbols per subframe for the PUSCH is determined based on Equation:
N symb PUSCH-initial =(2·( N symb UL −1)− N SRS )
where N symb UL denotes a number of SC-FDMA symbols in each slot in the UE-specific aperiodic SRS subframe, and N SRS =1.