Method and apparatus for handling UL-SCH transmission
A method for handling Uplink Shared Channel (UL-SCH) transmission in a User Equipment (UE) of a wireless communication system is disclosed. The method includes steps of performing an UL-SCH transmission, and prioritizing a Message 3 (Msg 3 ) transmission when the Msg 3 transmission and a retransmission of a transport block (TB) already stored in an UL HARQ buffer of the UE are scheduled at the same time.
1. A method for handling uplink shared channel (UL-SCH) transmission in a user equipment (UE) of a wireless communication system, the method comprising:
performing an initial transmission of a transport block (TB) on an UL-SCH transmission via a first Hybrid Automatic Repeat request (HARQ) process;
performing an initial transmission of a Message 3 (Msg 3 ) via a second HARQ process; and
prioritizing a retransmission of the Msg 3 when the retransmission of the msg 3 and a retransmission of the TB are scheduled as same time;
wherein the Msg 3 transmission is an uplink transmission on UL-SCH triggered by a random access procedure, and an Msg 3 comprises a cell radio network temporary identifier MAC control element (C-RNTI MAC CE) or a common control channel service data unit (CCCH SDU).
2. The method of claim 1 , wherein the method further comprises skipping the retransmission of the TB.
3. The method of claim 1 , wherein the retransmission of the TB can be an adaptive retransmission or a non-adaptive retransmission.
4. The method of claim 1 , wherein the retransmission of the TB belongs to a transmission time interval (TTI) bundle.
5. The method of claim 1 , wherein the random access procedure is initiated due to uplink data arrival.
6. The method of claim 1 , wherein the said same time is a same TTI.
7. A communication device for handling uplink shared channel (UL-SCH) transmission in a user equipment (UE) of a wireless communication system, the communication device comprising:
a processor for executing a program; and
a memory, coupled to the processor, for storing the program, wherein the program comprises:
performing an initial transmission of a transport block (TB) on an UL-SCH transmission via a first Hybrid Automatic Repeat request (HARQ) process;
performing an initial transmission of a Message 3 (Msg 3 ) via a second HARQ process; and
prioritizing a retransmission of the Msg 3 when the retransmission of the msg 3 and a retransmission of the TB are scheduled as same time;
wherein the Msg 3 transmission is an uplink transmission on UL-SCH triggered by a random access procedure, and an Msg 3 comprises a cell radio network temporary identifier MAC control element (C-RNTI MAC CE) or a common control channel service data unit (CCCH SDU).
8. The communication device of claim 7 , wherein the program further comprises skipping the retransmission of the TB.
9. The communication device of claim 7 , wherein the retransmission of the
TB can be an adaptive retransmission or a non-adaptive retransmission.
10. The communication device of claim 7 , wherein the retransmission of the TB belongs to a transmission time interval (TTI) bundle.
11. The communication device of claim 7 , wherein the random access procedure is initiated due to uplink data arrival.
12. The communication device of claim 7 , wherein the said same time is a same TTI.