Method and apparatus for maintaining a virtual active set including a closed subscriber group cell

A apparatus comprising at least one processor and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to:

• establish a virtual active set including a first closed subscriber group (CSG) cell;
• measure at least one parameter of each of the first CSG cell and a second CSG cell;
• and
• update the virtual active set by replacing the first CSG cell with the second CSG cell in response to the at least one parameter of the second CSG cell having a predefined relationship with respect to the at least one parameter of the first CSG cell for a time to trigger.

A computer program product comprising at least one computer-readable storage medium having computer-executable program code instructions stored therein, the computer-executable program code instructions comprising:

• program code instructions for establishing a virtual active set including a first closed subscriber group (CSG) cell;
• program code instructions for measuring at least one parameter of each of the first CSG cell and a second CSG cell;
• and
• program code instructions for updating the virtual active set by replacing the first CSG cell with the second CSG cell in response to the at least one parameter of the second CSG cell having a predefined relationship with respect to the at least one parameter of the first CSG cell for a time to trigger.