Method and apparatus for improving interaction between scheduling request procedure and random access procedure

A communication device for improving interaction between a Scheduling Request procedure and a Random Access procedure 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:
• triggering a Scheduling Request procedure;
• sending a Dedicated Scheduling Request (D-SR) message on a Physical Uplink Control Channel (PUCCH) repeatedly until an uplink transmission resource for a new transmission is received or the number of D-SR transmissions reaches to a specific value when the UE has a configured PUCCH resource;
• and
• deactivating all pre-configured Semi-Persistent Scheduling (SPS) transmission resources of a SPS operation allocated to the UE before performing a Random Access procedure corresponding to the Scheduling Request procedure when the number of D-SR transmissions reaches the specific value to prevent the UE from misusing the pre-configured. SPS transmission resources in a Random Access procedure performed in parallel with the SPS operation so that Random Access procedure failures and uplink transmission errors can be avoided.