Method of providing roaming service for a mobile communication terminal

• US 20020107017A1
• Filed: 12/17/2001
• Published: 08/08/2002
• Est. Priority Date: 02/05/2001
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Song, Sang-Uuk
• Application Number:
  US10/023,639
• Publication Number:
  US 20020107017A1
• Time in Patent Office: Days
• US Class Current: 455/432.1
• CPC Class Codes: H04W 48/12 using downlink control channel

Abstract

Disclosed is a method for enabling a mobile communication terminal to receive a roaming service. The method according to the invention includes the steps of receiving a system parameter message including a system ID from a base station by a mobile communication terminal of an idle state, determining whether or not the base station assists in a roaming service by means of the system ID, maintaining an idle state in the affirmative, and entering an out-of-service (OOS) state in the negative. The method according to the invention reduces unnecessary load of the system by minimizing the demands for a call to the base station that does not assist in a roaming service.

Claims

1. A method of providing a roaming service for a mobile communication terminal, the method comprising the steps of:

receiving a system parameter message including a system ID from a base station by a mobile communication terminal in an idle state;

determining whether or not the base station participates in a roaming service by utilizing the system ID;

maintaining the idle state if in the affirmative; and

entering an out-of-service (OOS) state if in the negative.

2. The roaming service method of claim 1, wherein the system parameter message is broadcasted to all mobile communication terminals through a paging channel.

3. The roaming service method of claim 1, wherein the system parameter message is transmitted in accordance with IS-95 standard criteria.

4. The roaming service method of claim 1, wherein the step of determining whether or not the base station participates in a roaming service is performed by comparing the system ID with a preferred roaming list stored in a memory of a mobile communication terminal.

5. The roaming service method of claim 4, wherein the preferred roaming list includes system IDs that can provide the mobile communication terminal with a roaming service.

6. The roaming service method of claim 4, wherein the preferred roaming list includes system IDs that cannot provide the mobile communication terminal with a roaming service.

7. The roaming service method of claim 1, wherein the mobile communication terminal entered into the OOS state displays “

an OOS state”

message on a display screen of the mobile communication terminal.

8. The roaming service method of claim 7, wherein the mobile communication terminal entered into the OOS state displays “

an OOS state”

on the display screen if user demands an outgoing call.

9. A roaming method for a mobile communication terminal that stores a preferred roaming list consisting of system IDs which participate in a roaming service, the method comprising the steps of:

receiving a system parameter message including a system ID from a base station through a paging channel by the mobile communication terminal in an idle state;

maintaining the idle state if the system ID is included in the stored preferred roaming list; and

entering an OOS state if the system ID is not included in the stored preferred roaming list.

10. A roaming method for a mobile communication terminal that stores a preferred roaming list consisting of system IDs which do not participate in a roaming service, the method comprising the steps of:

receiving a system parameter message including a system ID from a base station through a paging channel by the mobile communication terminal in an idle state;

maintaining the idle state if the system ID is not included in the stored preferred roaming list; and

entering an OOS state if the system ID is included in the stored preferred roaming list.