Service registering apparatus and method using cell reselection procedure in portable terminal

A method for performing a service registration through an abnormal cell reselection in a portable terminal, the method comprising:

• when a service registration fails, acquiring cell reselection parameters of a serving cell of the portable terminal and a cell to be reselected;
• applying a cell reselection offset to the cell reselection parameters of the serving cell to enable the cell reselection;
• and
• when the cell reselection parameters of the serving cell are less than the cell reselection parameters of the cell to be reselected, performing the cell reselection and re-executing the service registration.

An apparatus for performing a service registration in a portable terminal, the method comprising:

• means for acquiring cell reselection parameters of a serving cell of the portable terminal and a cell to be reselected;
• means for applying a cell reselection offset to the cell reselection parameters of the serving cell to enable the cell reselection;
• and
• means for, when the cell reselection parameters of the serving cell are less than the cell reselection parameters of the cell to be reselected, performing the cell reselection and re-executing the service registration.

A computer-readable recording medium having recorded thereon a program for performing a service registration in a portable terminal, comprising:

• a first code segment, for acquiring cell reselection parameters of a serving cell of the portable terminal and a cell to be reselected;
• a second code segment, for applying a cell reselection offset to the cell reselection parameters of the serving cell to enable the cell reselection;
• and
• a third code segment, for, when the cell reselection parameters of the serving cell are less than the cell reselection parameters of the cell to be reselected, performing the cell reselection and re-executing the service registration.