Method and apparatus for determining active bandwidth part

An apparatus, comprising:

• at least one non-transitory computer-readable medium having stored thereon computer-executable instructions;
• at least one receiving circuitry;
• at least one transmitting circuitry;
• and
• at least one processor coupled to the at least one non-transitory computer-readable medium, the at least one receiving circuitry, and the at least one transmitting circuitry, wherein the computer-executable instructions cause the at least one processor to implement a method, the method comprising:
• receiving first configuration information indicating association between bandwidth part (BWP) and reference signal (RS);
• determining a first RS, which is indicated by second configuration information, or user equipment (UE) selected, or predefined in specification(s);
• and
• determining an active BWP based on the first RS and the association between BWP and RS.