Method and apparatus for handling overlap of different channels in wireless communication system
A method and apparatus for handling overlap of multiple channels in a wireless communication system is provided. A user equipment (UE), which operates in half-duplex frequency division duplex (FDD), determines that a periodic uplink (UL) transmission collides with a physical downlink shared channel (PDSCH) reception in a subframe, and performs either the periodic UL transmission or the PDSCH reception in the subframe. When the periodic UL transmission corresponds to a semi-persistent scheduled (SPS) physical uplink shared channel (PUSCH), the PDSCH reception is performed.
1. A method performed by a wireless device in a wireless communication system, the method comprising:
identifying a first subframe in which a periodic uplink (UL) transmission is scheduled, wherein the periodic UL transmission comprises a UL transmission which is based on a semi-persistent scheduling (SPS);
identifying a second subframe in which a physical downlink shared channel (PDSCH) reception is scheduled;
comparing a priority of the periodic UL transmission with a priority of the PDSCH reception, based on the second subframe being identical to the first subframe; and
based on a result of the comparison, performing one of the periodic UL transmission or the PDSCH reception and dropping the other one of the periodic UL transmission or the PDSCH reception,
wherein the wireless device operates in a half-duplex frequency division duplex (FDD).
2. The method of claim 1 , wherein the PDSCH reception is performed, and
wherein the periodic UL transmission comprises a physical uplink shared channel (PUSCH) transmission which is based on the SPS.
3. The method of claim 2 , wherein the PDSCH reception is scheduled by a downlink (DL) grant.
4. The method of claim 1 , wherein the periodic UL transmission is performed, and
wherein the result of the comparison is that the priority of the periodic UL transmission is higher than the priority of the PDSCH reception.
5. The method of claim 1 , wherein the periodic UL transmission is performed, and
wherein the periodic UL transmission comprises a message related to a physical random access channel (PRACH) procedure.
6. The method of claim 1 , wherein the periodic UL transmission is performed, and
wherein the periodic UL transmission comprises a positive scheduling request (SR).
7. The method of claim 1 , wherein the wireless device comprises a low complexity user equipment (UE), a machine-type communication (MTC) UE, a bandwidth reduced low complexity (BL) UE or a UE in an enhanced coverage.
8. A wireless device in a wireless communication system, the wireless device comprising:
a memory;
a transceiver; and
at least one processor operatively coupled to the memory and the transceiver, wherein the at least one processor is configured to:
identify a first subframe in which a periodic uplink (UL) transmission is scheduled, wherein the periodic UL transmission comprises a UL transmission which is based on a semi-persistent scheduling (SPS);
identify a second subframe in which a physical downlink shared channel (PDSCH) reception is scheduled;
compare a priority of the periodic UL transmission with a priority of the PDSCH reception, based on the second subframe being identical to the first subframe; and
based on a result of the comparison, perform one of the periodic UL transmission or the PDSCH reception and drop the other one of the periodic UL transmission or the PDSCH reception,
wherein the wireless device operates in a half-duplex frequency division duplex (FDD).
9. The wireless device of claim 8 , wherein the PDSCH reception is performed, and
wherein the periodic UL transmission comprises a physical uplink shared channel (PUSCH) transmission which is based on the SPS.
10. The wireless device of claim 9 , wherein the PDSCH reception is scheduled by a downlink (DL) grant.
11. The wireless device of claim 8 , wherein the periodic UL transmission is performed, and
wherein the result of the comparison is that the priority of the periodic UL transmission is higher than the priority of the PDSCH reception.
12. The wireless device of claim 8 , wherein the periodic UL transmission is performed, and
wherein the periodic UL transmission comprises a message related to a physical random access channel (PRACH) procedure.
13. The wireless device of claim 8 , wherein the periodic UL transmission is performed, and
wherein the periodic UL transmission comprises a positive scheduling request (SR).
14. The wireless device of claim 8 , wherein the wireless device comprises a low complexity user equipment (UE), a machine-type communication (MTC) UE, a bandwidth reduced low complexity (BL) UE or a UE in an enhanced coverage.