Method and apparatus for handling uplink grant
A method for handling an uplink grant received on a physical downlink control channel (PDCCH) in a user equipment (UE) of a wireless communication system is disclosed. The method includes steps of setting a Temporary Cell Radio Network Temporary Identifier (Temporary C-RNTI) of the UE to a value assigned in a Random Access Response message, monitoring a contention resolution message, receiving an uplink grant on PDCCH addressed to the Temporary C-RNTI, and not using the uplink grant to transmit data if the uplink grant corresponds to a Hybrid Automatic Repeat Request (HARQ) Process different from an HARQ Process used for transmission of a MediumAccess Control (MAC) Protocol Data Unit (PDU) in a Message 3 buffer.
1. A method for handling an uplink grant received on a physical downlink control channel (PDCCH) in a user equipment (UE) of a wireless communication system, the method comprising:
setting a Temporary Cell Radio Network Temporary Identifier (Temporary C-RNTI) of the UE to a value assigned in a Random Access Response message;
monitoring a Contention Resolution message;
receiving an uplink grant on PDCCH addressed to the Temporary C-RNTI; and
not using the uplink grant to transmit data when the uplink grant corresponds to a Hybrid Automatic Repeat Request (HARQ) Process different from an HARQ Process used for transmission of a Medium Access Control (MAC) Protocol Data Unit (PDU) in a Message 3 buffer.
2. The method of claim 1 further comprising:
stopping a Contention Resolution Timer of the UE.
3. The method of claim 1 further comprising:
considering contention of the UE as not successful.
4. The method of claim 1 further comprising:
discarding the Temporary C-RNTI.
5. The method of claim 1 , wherein the step of not using the uplink grant to transmit data comprises not using the uplink grant for a new transmission.
6. The method of claim 1 , wherein the step of not using the uplink grant to transmit data comprises not using the uplink grant for a retransmission.
7. A communication device for handling an uplink grant received on a physical downlink control channel (PDCCH) 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:
setting a Temporary Cell Radio Network Temporary Identifier (Temporary C-RNTI) of the UE to a value assigned in a Random Access Response message;
monitoring a Contention Resolution message;
receiving an uplink grant on PDCCH addressed to the Temporary C-RNTI; and
not using the uplink grant to transmit data when the uplink grant corresponds to a Hybrid Automatic Repeat Request (HARQ) Process different from an HARQ Process used for transmission of a MediumAccess Control (MAC) Protocol Data Unit (PDU) in a Message 3 buffer.
8. The communication device of claim 7 , wherein the program further comprises:
stopping a Contention Resolution Timer of the UE.
9. The communication device of claim 7 , wherein the program further comprises:
considering contention of the UE as not successful.
10. The communication device of claim 7 , wherein the program further comprises:
discarding the Temporary C-RNTI.
11. The communication device of claim 7 , wherein the step of not using the uplink grant to transmit data comprises not using the uplink grant for a new transmission.
12. The communication device of claim 7 , wherein the step of not using the uplink grant to transmit data comprises not using the uplink grant for a retransmission.