Method for receiving or transmitting uplink signal in wireless communication system and apparatus therefor
According to an embodiment of the present invention, an MTC UE performs frequency retuning in order to perform uplink transmission through different subbands in consecutive first and second subframes, wherein positions of symbols, used for frequency retuning within the range of last n symbols of the first subframe to first n symbols of the second subframe, are determined according to priority between uplink signals to be transmitted.
1. A method of transmitting an uplink signal by a machine type communication (MTC) user equipment (UE) in a wireless communication system, the method comprising:
transmitting a first uplink signal through a first subband in a first subframe;
retuning a frequency of the MTC UE from the first subband to a second subband; and
transmitting a second uplink signal through the second subband in a second subframe,
wherein in the retuning of the frequency, when the first subframe and the second subframe are consecutive, the MTC UE performs frequency retuning instead of transmission of the first uplink signal or the second uplink signal in at least parts of last n symbols of the first subframe and first n symbols of the second subframe,
wherein positions of the at least parts of the symbols, used for frequency retuning within a range of the last n symbols of the first subframe to the first n symbols of the second subframe, are determined according to a predetermined priority between the first uplink signal and the second uplink signal.
2. The method according to claim 1 , wherein, in the retuning of the frequency,
frequency retuning is performed in the first n symbols of the second subframe when the first uplink signal is prioritized over the second uplink signal and
frequency retuning is performed in the last n symbols of the first subframe when the second uplink signal is prioritized over the first uplink signal.
3. The method according to claim 2 , wherein, when the first uplink signal and the second uplink signal have a same priority, the at least parts of the symbols in which frequency retuning is performed are equally distributed in the first subframe and the second subframe.
4. The method according to claim 1 , wherein, when the first uplink signal includes a sounding reference signal (SRS) and the second uplink signal includes a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH), the at least parts of the symbols in which frequency retuning is performed include a last symbol of the first subframe and transmission of the SRS is dropped.
5. The method according to claim 1 ,
wherein the at least parts of the symbols in which frequency retuning is performed are set to the first n symbols of the second subframe when the first uplink signal is a physical uplink control channel (PUCCH) and the second uplink signal is a physical uplink shared channel (PUSCH) and
wherein the at least parts of the symbols in which frequency retuning is performed are set to the last n symbols of the first subframe when the first uplink signal is the PUSCH and the second uplink signal is the PUCCH.
6. The method according to claim 1 , wherein, when a sounding reference signal (SRS) and one of a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH) are set to a same subframe and a subband of the SRS differs from a subband of the PUCCH or the PUSCH, transmission of the SRS is dropped.
7. The method according to claim 1 , wherein a physical uplink control channel (PUCCH) is prioritized over a physical uplink shared channel (PUSCH) and the PUSCH is prioritized over a sounding reference signal (SRS) according to the predetermined priority.
8. The method according to claim 1 , further comprising receiving a radio resource control (RRC) configuration about a subband in which a physical uplink shared channel (PUSCH) is transmitted,
wherein the subband in which the PUSCH is transmitted is frequency-hopped on the basis of the RRC configuration.
9. The method according to claim 1 , wherein, in the retuning of the frequency, frequency retuning is performed in the first n symbols of the second subframe when the first uplink signal includes a physical random access channel (PRACH) and frequency retuning is performed in the last n symbols of the first subframe when the second uplink signal includes the PRACH.
10. A machine type communication (MTC) user equipment (UE) comprising:
a transmitter to transmit a first uplink signal through a first subband in a first subframe and to transmit a second uplink signal through a second subband in a second subframe; and
a processor to retune a frequency of the MTC UE from the first subband to the second subband,
wherein, when the first subframe and the second subframe are consecutive, the processor performs frequency retuning instead of transmission of the first uplink signal or the second uplink signal in at least parts of last n symbols of the first subframe and first n symbols of the second subframe,
wherein positions of the at least parts of the symbols, used for frequency retuning within a range of the last n symbols of the first subframe to the first n symbols of the second subframe, are determined according to a predetermined priority between the first uplink signal and the second uplink signal.
11. The MTC UE according to claim 10 ,
wherein frequency retuning is performed in the first n symbols of the second subframe when the first uplink signal is prioritized over the second uplink signal and
wherein frequency retuning is performed in the last n symbols of the first subframe when the second uplink signal is prioritized over the first uplink signal.
12. The MTC UE according to claim 10 , wherein, when the first uplink signal includes a sounding reference signal (SRS) and the second uplink signal includes a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH), the at least parts of symbols in which frequency retuning is performed include a last symbol of the first subframe and transmission of the SRS is dropped.
13. The MTC UE according to claim 10 ,
wherein the at least parts of symbols in which frequency retuning is performed are set to the first n symbols of the second subframe when the first uplink signal is a physical uplink control channel (PUCCH) and the second uplink signal is a physical uplink shared channel (PUSCH) and
wherein the at least parts of symbols in which frequency retuning is performed are set to the last n symbols of the first subframe when the first uplink signal is a physical uplink shared channel (PUSCH) and the second uplink signal is a physical uplink control channel (PUCCH).
14. The MTC UE according to claim 10 , wherein, when a sounding reference signal (SRS) and one of a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH) are set to a same subframe and a subband of the SRS differs from a subband of the PUCCH or the PUSCH, transmission of the SRS is dropped.
15. The MTC UE according to claim 10 , wherein a physical uplink control channel (PUCCH) is prioritized over a physical uplink shared channel (PUSCH) and the PUSCH is prioritized over a sounding reference signal (SRS) according to the predetermined priority.