Method for roaming call implement to foreign intelligent client

• US 20040242225A1
• Filed: 07/12/2004
• Published: 12/02/2004
• Est. Priority Date: 08/07/2001
• Status: Active Grant

• Current Assignee: INVT SPE LLC (SoftBank Group Corp.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Wang, Jincheng
• Granted Patent: US 7,349,693 B2
• Time in Patent Office: Days
• US Class Current: 455/432.1
• CPC Class Codes: H04W 8/12 between location registers or mobility servers

Abstract

The present invention discloses a method for implementing a roaming call for a non-local intelligent network subscriber. The method comprises the following steps: a. a non-local Gateway Mobile Switching Center (GMSC) initiating a Send Routing Information (SRI) operation to a Home Location Register (HLR) to request the roaming number of the called subscriber; b. the HLR returning a virtual roaming number to the non-local GMSC, and the GMSC connecting the call to a Service Switching Point (SSP) of an intelligent platform according to the virtual roaming number; c. the SSP initiating a SRI operation to the HLR with the virtual roaming number in an Initialize Address Information (IAI) message; d. after finding the number in the SRI operation is a virtual roaming number allocated before, the HLR returning the actual subscriber number corresponding to the roaming number and Customer Sign Information (CSI) data of the intelligent network subscriber corresponding to the actual subscriber number to said SSP; and e. the SSP triggering service logic based on said CSI data, and connecting the call to a Visited Mobile Switching Center (VMSC) corresponding to the called subscriber. With this method, the billing system of mobile intelligent network can be improved.

Claims

1. A method for implementing a roaming call for a non-local intelligent network subscriber, comprising:

a. a non-local Gateway Mobile Switching Center (GMSC) initiating a Send Routing Information (SRI) operation to a Home Location Register (HLR) to request the roaming number of the called subscriber;

b. the HLR returning a virtual roaming number to the non-local GMSC, and the GMSC connecting the call to a Service Switching Point (SSP) of an intelligent platform according to the virtual roaming number;

c. the SSP initiating a SRI operation to the HLR with the virtual roaming number in an Initialize Address Information (IAI) message;

d. after finding the number in the SRI operation is a virtual roaming number allocated before, the HLR returning the actual subscriber number corresponding to the roaming number and Customer Sign Information (CSI) data of the intelligent network subscriber corresponding to the actual subscriber number to said SSP; and

e. the SSP triggering service logic based on said CSI data, and connecting the call to a Visited Mobile Switching Center (VMSC) corresponding to the called subscriber.

2. The method according to claim 1, step b further comprising:

b1. after receiving said SRI operation and judging whether the subscriber of the SRI operation is an intelligent network subscriber, the HLR sending said non-local GMSC a SRI acknowledgement (SRIack) message which includes a virtual roaming number allocated according to the Globe Title (GT) of said SSP, and recording correspondence relationship between the virtual roaming number and the real mobile station ISDN (MSISDN) number; and

b2. said non-local GMSC sending an IAI message to said SSP according to the virtual roaming number returned in the SRIack message, and routing the call to said SSP of the local intelligent platform.

3. The method according to claim 1, step e further comprising:

e1. after having obtained the real MSISDN and CSI data of the called subscriber, said SSP sending an Initiate Detection Point (IDP) message to a SCP of the intelligent platform to trigger a called procedure to the intelligent platform;

e2. during processing the IDP message, said SCP sequentially sending a Request Report BCSM event (RRBE) and an Apply Charging (AC) operation to said SSP;

e3. after having processed corresponding intelligent service, the SCP sending a continue message to said SSP to inform that said call can be connected;

e4. after receiving said continue message, said SSP sending a SRI message to said HLR;

e5. after receiving said SRI, said HLR sending a Provide Roaming Number (PRN) operation to a Visited Location Register (VLR) to obtain the real roaming number of the subscriber;

e6. after receiving said PRN operation, said VLR returning a PRN acknowledgement (PRNack) and the roaming number of the subscriber to said HLR;

e7. the HLR then returning the real roaming number of the subscriber to said SSP; and

e8. the SSP connecting said call to said VMSC corresponding to the called subscriber according to the real roaming number of the subscriber.

4. The method according to claim 3, wherein CAMEL Application Part (CAP) signaling protocol is applied in the communication between said SSP and SCP.

5. The method according to claim 3, wherein the SRI message in step e4 does not include CSI data.

6. The method according to claim 1, further comprising the step of billing for the call in the intelligent platform.

7. The method according to claim 1, wherein said SSP meets the standards of European Telecommunication Standard Institute (ETSI).

8. The method according to claim 1, wherein the SSP triggers a service using a virtual called number in the SRI operation if the SRIack does not include MSISDN, or using MSISDN in the SRIack message if the SRIack includes MSISDN.

9. The method according to claim 2, wherein the SSP triggers a service using a virtual called number in the SRI operation if the SRIack does not include MSISDN, or using MSISDN in the SRIack message if the SRIack includes MSISDN.

10. The method according to claim 1, step d further comprising:

the HLR directly returning said CSI data or the roaming number of the subscriber if the SRI operation sent to the HLR includes a real subscriber number and does not include the CSI data.