Method for transmitting uplink channel and wireless device requiring coverage enhancement
One embodiment of the present specification provides a method by which a wireless device, to which coverage enhancement (CE) is applied, transmits an uplink channel. The method can comprise a step for receiving, by the wireless device, sounding reference signal (SRS) configuration information for other wireless devices within a cell. The SRS configuration information can comprise information on SRS transmittable subframes. The method can comprise a step for transmitting, by the wireless device, the uplink channel on symbols except for a final symbol on subframes according to a reduced format, when the wireless device transmits the uplink channel on the subframes directed by the subframe information within the SRS configuration information for other wireless devices.
1. A method for transmitting a physical uplink shared channel (PUSCH), the method performed by a wireless device and comprising:
receiving information on a cell-specific sounding reference signal (SRS) subframe configured for any other user equipment (UE), wherein the wireless device is configured to not transmit the SRS,
determining whether a subframe for transmitting a PUSCH includes a symbol overlapping an SRS symbol in the cell-specific SRS subframe; and
mapping the PUSCH to one or more symbols of the subframe including the symbol overlapping the SRS symbol,
wherein the symbol overlapping the SRS symbol is not used by the wireless device, which is configured to not transmit the SRS.
2. The method of claim 1 , further comprising:
determining whether the subframe for transmitting the PUSCH is the cell-specific SRS subframe.
3. A method for transmitting a sounding reference signal (SRS), the method performed by a wireless device and comprising:
determining whether a first frequency band in a subframe n is not included within a second frequency band in a subframe n+1;
when the first frequency band in the subframe n is not included within the second frequency band in the subframe n+1, determining that the SRS is to be dropped from the subframe n;
when the first frequency band in the subframe n is included within the second frequency band in the subframe n+1, transmitting the SRS in the subframe n.
4. The method of claim 3 , wherein the wireless device is configured for coverage enhancement or to use a reduced bandwidth.
5. The method of claim 3 , further comprising:
hopping from the first frequency band to the second frequency band.
6. The method of claim 3 , wherein a physical uplink shared channel (PUSCH) is transmitted in the subframe n.
7. A wireless device for transmitting a physical uplink shared channel (PUSCH), the wireless device comprising:
a transceiver configured to receive information on a cell-specific sounding reference signal (SRS) subframe configured for any other user equipment (UE), wherein the wireless device is configured to not transmit the SRS, and
a processor, operatively coupled to the transceiver, wherein the processor is configured to:
determine whether a subframe for transmitting a PUSCH includes a symbol overlapping an SRS symbol in the cell-specific SRS subframe; and
map the PUSCH on one or more symbols of the subframe including the symbol overlapping the SRS symbol,
wherein the symbol overlapping the SRS symbol is not used by the wireless device which is configured to not transmit the SRS.
8. The wireless device of claim 7 , wherein the processor is further configured to:
determine whether the subframe for transmitting the PUSCH is the cell-specific SRS subframe.