WE CLAIM: 1. A communication method performed in a mobile communication system which comprises specific user equipments, base stations provided to cells for specific subscribers that are accessible by said user equipments and a radio network controller managing an access made by said user equipments to said cells for specific subscribers and a tracking area for tracking location of said user equipments, comprising the steps of:
requesting an update of a tracking area from said user equipments to said radio network controller through said base stations manually selected by said user equipments;
checking in said radio network controller whether access made by said user equipments to said cells for specific subscribers is allowed;
accepting an update of a tracking area from said radio network controller to said user equipments through said base stations in a case where access made by said user equipments to said cells for specific subscribers is allowed; and
adding said cells for specific subscribers by said user equipments to a list of cells
for specific subscribers authorized to access in a case where said user equipments are
accepted to update a tracking area.
2. A mobile communication system comprising specific user equipments, base stations
provided to cells for specific subscribers that are accessible by said user equipments
and a radio network controller managing an access made by said user equipments to
said cells for specific subscribers and a tracking area for tracking location of said user
equipments, wherein:
said user equipments comprises the means of:
requesting an update of a tracking area to said radio network controller through

said base stations manually selected by said user equipments; and
adding said cells for specific subscribers to which said base stations manually selected by said user equipments are provided, to a list of cells for specific subscribers authorized to access in a case where an update of a tracking area is accepted by said radio network controller;
said radio network controller comprises the means of:
checking whether access made by said user equipments to said cells for specific subscribers is allowed; and
accepting an update of a tracking area to said user equipments through said base stations in a case where access made by said user equipments to said cells for specific subscribers is allowed.
3. User equipments in a mobile communication system comprising specific user
equipments, base stations provided to cells for specific subscribers that are accessible
by said user equipments and a radio network controller managing an access made by
said user equipments to said cells for specific subscribers and a tracking area for
tracking location of said user equipments, comprising the means of:
requesting an update of a tracking area to said radio network controller through said base stations manually selected by said user equipments; and
adding said cells for specific subscribers to which said base stations manually selected by said user equipments are provided, to a list of cells for specific subscribers authorized to access in a case where an update of a tracking area is accepted by said radio network controller.
4. A radio network controller in a mobile communication system comprising specific

user equipments, base stations provided to cells for specific subscribers that are accessible by said user equipments and a radio network controller managing an access made by said user equipments to said cells for specific subscribers and a tracking area for tracking location of said user equipments, comprising the means of:
checking whether access made by said user equipments to said cells for specific
subscribers is allowed; and
accepting an update of a tracking area to said user equipments through said base
stations in a case where access made by said user equipments to said cells for specific
subscribers is allowed.