Data transmission method and device in wireless communication system
A data transmission method and device are provided in a wireless communication system with user equipment (UE). A UE transmits uplink data through sounding reference signals (SRS) and a physical uplink shared channel (PUSCH) in a SRS subframe. A single carrier-frequency division multiple access (SC-FDMA) symbol allocated to said SRS and the SC-FDMA symbol do not overlap within said SRS subframe.
1. A data transmission method by a user equipment (UE) in a wireless communication system, the data transmission method comprising:
mapping uplink data to resource elements corresponding to physical resource blocks assigned for transmission of 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 possible transmission of an aperiodic SRS, and
wherein the uplink data is not mapped to the reserved SC-FDMA symbol; and
transmitting the mapped uplink data to a base station via the UE-specific aperiodic SRS subframe,
wherein the UE-specific aperiodic SRS subframe is one of a plurality of UE-specific subframes configured by a UE-specific aperiodic SRS parameter, and
wherein the aperiodic SRS is not transmitted in the UE-specific aperiodic SRS subframe.
2. The data transmission method of claim 1 , wherein the UE-specific aperiodic SRS parameter indicates a periodicity and an offset of the plurality of UE-specific SRS subframes.
3. The data transmission method of claim 1 , wherein the UE-specific aperiodic SRS parameter is given by a higher layer.
4. The data transmission method of claim 1 , further comprising transmitting the aperiodic SRS to the base station in the UE-specific aperiodic SRS subframe.
5. The data transmission method of claim 1 , wherein the SC-FDMA symbol reserved for the possible SRS transmission is a last SC-FDMA symbol of the UE-specific aperiodic SRS subframe.
6. The data transmission method of claim 1 , wherein the PUSCH is subject to rate matching except the SC-FDMA symbol reserved for the possible SRS transmission, the rate matching being performed by determining, by the UE, a number of coded modulation symbols.
7. The data transmission method of claim 6 , wherein the number of coded modulation symbols is determined based on a number of SC-FDMA symbols per subframe for the PUSCH transmission.
8. The data transmission method of claim 7 , wherein the number of SC-FDMA symbols per subframe for the PUSCH transmission 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.
9. A user equipment (UE) in a wireless communication system, the UE comprising:
a radio frequency (RF) unit configured to transmit or receive a radio signal; and
a processor, operatively coupled to the RF unit, and configured to:
map uplink data to resource elements corresponding to physical resource blocks assigned for transmission of 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 possible transmission of an aperiodic SRS, and
wherein the uplink data is not mapped to the reserved SC-FDMA symbol; and
transmit the mapped uplink data to a base station via the UE-specific aperiodic SRS subframe,
wherein the UE-specific aperiodic SRS subframe is one of a plurality of UE-specific subframes configured by a UE-specific aperiodic SRS parameter, and
wherein the aperiodic SRS is not transmitted in the UE-specific aperiodic SRS subframe.
10. The UE of claim 9 , wherein the processor is further configured to transmit the aperiodic SRS to the base station in the UE-specific aperiodic SRS subframe.
11. The UE of claim 9 , wherein the PUSCH is subject to rate matching except the SC-FDMA symbol reserved for the possible SRS transmission, the rate matching being performed by determining, by the UE, a number of coded modulation symbols.
12. The UE of claim 11 , wherein the number of coded modulation symbols is determined based on a number of SC-FDMA symbols per subframe for the PUSCH transmission.
13. The UE of claim 12 , wherein the number of SC-FDMA symbols per subframe for the PUSCH transmission 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.
14. The UE of claim 9 , wherein the UE-specific aperiodic SRS parameter indicates a periodicity and an offset of the plurality of UE-specific SRS subframes.