Method for skipping an UL transmission in a wireless communication system and device therefor
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for skipping an UL transmission in a wireless system, the method comprising: receiving a RRC signaling configuring that the UE skips an UL transmission if there is no data available for transmission, receiving an UL grant for new transmission for a HARQ process, and discarding an old MAC PDU in a HARQ buffer of the HARQ process without storing any new MAC PDU in the HARQ buffer, if there is no data available for transmission.
1. A method for operating, by a user equipment (UE), in a wireless communication system, the method comprising:
receiving configuration related to a skip of an uplink (UL) transmission;
receiving, from a base station, an uplink (UL) grant for the UL transmission for a hybrid automatic repeat and request (HARQ) process; and
performing a specific operation based on the configuration,
wherein the specific operation comprises:
based on a Medium Access Control (MAC) protocol data unit (PDU) for the UL grant being not obtained, not delivering the UL grant to the HARQ process and flushing, for skipping the UL transmission on the UL grant, a HARQ buffer related to the HARQ process; and
based on the MAC PDU for the UL grant being obtained, delivering the UL grant to the HARQ process and transmitting the MAC PDU on the UL grant.
2. The method of claim 1 , wherein the UL grant is an UL grant for a new transmission.
3. The method of claim 1 , wherein the configuration is received via a radio resource control (RRC) message.
4. The method of claim 1 , further comprising:
determining that data is not available for transmission.
5. A user equipment (UE) configured to operate in a wireless communication system, the UE comprising:
a transceiver; and
a processor operatively connected to the transceiver and configured to:
control the transceiver to receive configuration related to a skip of an uplink (UL) transmission;
control the transceiver to receive, from a base station, an uplink (UL) grant for the UL transmission for a hybrid automatic repeat and request (HARQ) process; and
perform a specific operation based on the configuration,
wherein the specific operation comprises:
based on a Medium Access Control (MAC) protocol data unit (PDU) for the UL grant being not obtained, not delivering the UL grant to the HARQ process and flushing, for skipping the UL transmission on the UL grant, a HARQ buffer related to the HARQ process, and
based on the MAC PDU for the UL grant being obtained, delivering the UL grant to the HARQ process and controlling the transceiver to transmit the MAC PDU on the UL grant based on the configuration set not to skip the UL transmission.
6. The UE of claim 5 , wherein the UL grant is an UL grant for a new transmission.
7. The UE of claim 5 , wherein the configuration is received via a radio resource control (RRC) message.
8. The UE of claim 5 , wherein the processor is further configured to determine that data is not available for transmission.