METHOD FOR IMPLEMENTING IP MULTIMEDIA SUBSYSTEM REGISTRATION

• US 20080039081A1
• Filed: 09/18/2007
• Published: 02/14/2008
• Est. Priority Date: 08/08/2005
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: MA, Chunyan, YU, Bin
• Granted Patent: US 8,514,870 B2
• Time in Patent Office: Days
• US Class Current: 455/433
• CPC Class Codes: H04L 61/4588 containing mobile subscriber information, e.g. home subscriber server [HSS]
• CPC Class Codes: H04L 63/08 for authentication of entities cryptographic mechanisms or cryptographic arrangements for entity authentication H04L9/32
• CPC Class Codes: H04L 65/1016 IP multimedia subsystem [IMS]
• CPC Class Codes: H04L 65/1043 Gateway controllers, e.g. media gateway control protocol [MGCP] controllers
• CPC Class Codes: H04L 65/1104 Session initiation protocol [SIP]

Abstract

A method for implementing an IP Multimedia Subsystem (IMS) registration, includes: a Home Subscriber Server (HSS) recording a current registration state of a User Equipment (UE) in response to receiving a Multimedia Authentication Request (MAR) initiated by a Service Call Session Control Function (S-CSCF) selected for the UE when a first Register request is sent by the UE; in response to receiving a second Register request initiated by an Interrogating Call Session Control Function (I-CSCF), the HSS sends the S-CSCF Name to the I-CSCF when the current registration state of the UE is an assigned S-CSCF state. By the scheme, a same S-CSCF is ensured to be used in the two User Authentication Request/User Authentication Answer (UAR/UAA) procedures of the initial IMS registration procedure, and the initial IMS registration of the UE is implemented successfully.

Claims

1. A method for implementing an Internet Protocol (IP) Multimedia Subsystem (IMS) registration, comprising:

receiving, by a Home Subscriber Server (HSS), an Multimedia Authentication Request (MAR) message from a Service Call Session Control Function (S-CSCF);

wherein the S-CSCF is selected for a User Equipment (UE) when a first Register request is sent by the UE;

recording, by the HSS, the current registration state of the UE, generating Authentication Vectors (AV) and sending the AVs to the S-CSCF;

initiating, by the S-CSCF, an authentication challenge to the UE according to the AVs returned by the HSS;

sending, by the UE, a second Register request to an Interrogating Call Session Control Function (I-CSCF), after the UE implements the authentication challenge;

notifying, by the I-CSCF, the HSS of inquiring the subscriber registration state; and

returning, by the HSS, an S-CSCF Name to the I-CSCF when the current registration state of the UE is an assigned S-CSCF state.

2. The method of claim 1, further comprising:

sending, by the I-CSCF, the second Register request to the S-CSCF according to the S-CSCF Name returned by the HSS; and

changing, by the S-CSCF, the current registration state of the UE to a registered state, after the S-CSCF authenticates the UE.

3. The method of claim 1, further comprising:

before receiving by the HSS the MAR message from the S-CSCF, sending, by the UE, the first Register request to the I-CSCF through a Proxy Call Session Control Function (P-CSCF);

notifying, by the I-CSCF, the HSS of inquiring the subscriber registration state, in response to receiving the first Register request;

returning, by the HSS, S-CSCF Capabilities to the I-CSCF;

selecting, by the I-CSCF, the S-CSCF according to the S-CSCF Capabilities and storing the S-CSCF Name of the S-CSCF; and

sending, by the I-CSCF, the first Register request to the S-CSCF.

4. The method of claim 3, wherein the notifying by the I-CSCF the HSS of inquiring the subscriber registration state in response to receiving the first Register request comprises:

sending, by the I-CSCF, a User Authentication Request (UAR) message to the HSS; and

the returning by the HSS the S-CSCF Capabilities to the I-CSCF comprises;

sending, by the HSS, a User Authentication Answer (UAA) message carrying the S-CSCF Capabilities to the I-CSCF.

5. The method of claim 1, wherein the recording the current registration state of the UE comprises:

setting, by the HSS, a Pending Flag stored in the HSS to a Pending state.

6. The method of claim 5, wherein,

the current registration state of the UE is the assigned S-CSCF state when the current registration state of the UE is selected from the group consisting of a registered state, an unregistered state, and a not registered state;

and

the Pending Flag is set to be the Pending state.

7. The method of claim 1, wherein the recording the current registration state of the UE comprises:

recording, by the HSS, the current registration state of the UE as an Authentication Pending state, if the S-CSCF Name of the S-CSCF is not consistent with the S-CSCF Name stored in the HSS;

recording, by the HSS, the current registration state of the UE as the Authentication Pending state, if the S-CSCF Name of the S-CSCF is consistent with the S-CSCF Name stored in the HSS and the current registration state of the UE is selected from the group consisting of the unregistered state and the not registered state; and

recording, by the HSS, the current registration state of the UE as a registered state, if the S-CSCF Name of the S-CSCF is consistent with the S-CSCF Name stored in the HSS and the current registration state of the UE is not selected from the group consisting of the unregistered state and the not registered state.

8. The method of claim 7, wherein the current registration state of the UE is the assigned S-CSCF state when the current registration state of the UE is selected from the group consisting of the Authentication Pending state and the registered state.

9. The method of claim 1, wherein the current registration state of the UE is the assigned S-CSCF state when a current public subscriber ID registration state of the UE is selected from the group consisting of a registered state, an unregistered state, and a not registered state, but one or more of the other public subscriber ID registration states of the UE are selected from the group consisting of the registered state and the unregistered state.

10. The method of claim 1, wherein the recording the current registration state of the UE comprises:

storing, by the HSS, the S-CSCF Name of the S-CSCF carried in the MAR message.

11. The method of claim 10, wherein the current registration state of the UE is the assigned S-CSCF state when a current public subscriber ID registration state of the UE is the not registered state, and none of the other public subscriber ID registration states of the UE is selected from the group consisting of a registered state and an unregistered state, and the HSS stores the S-CSCF Name of the S-CSCF selected for the UE.

12. The method of claim 1, wherein the notifying by the I-CSCF the HSS of inquiring the subscriber registration state comprises:

sending, by the I-CSCF, a User Authorization Request (UAR) message to the HSS; and

the returning by the HSS the S-CSCF Name to the I-CSCF comprises;

sending, by the HSS, a User Authentication Answer (UAA) message carrying the S-CSCF Name to the I-CSCF.

13. The method of claim 1, wherein the receiving the MAR message from the S-CSCF comprises:

receiving, by the HSS, the MAR message carrying the S-CSCF Name of the S-CSCF; and

the returning by the HSS the AVs comprises;

sending, by the HSS, the S-CSCF a Multimedia Authentication Answer (MAA) message carrying the AVs generated.

14. The method of claim 1, further comprising:

receiving, by the HSS, a subscriber Location Inquiry Request (LIR) message from the I-CSCF in response to recording the current registration state of the UE;

returning, by the HSS, the I-CSCF a Location Inquiry Answer (LIA) message carrying the S-CSCF Name if a current registration state of the UE is a not registered state, and a Pending Flag stored in the HSS is in a Pending state; and

sending, by the I-CSCF, a session initialization (INVITE) message to the S-CSCF corresponding to the S-CSCF Name carried in the LIA message.

15. The method of claim 1, further comprising:

receiving, by the HSS, a subscriber Location Inquiry Request (LIR) message from the I-CSCF in response to recording the current registration state of the UE;

returning, by the HSS, the I-CSCF an LIA message carrying the S-CSCF Name, if the current registration state of the UE is selected from the group consisting of an Authentication Pending state and a registered state; and

sending, by the I-CSCF, an INVITE message to the S-CSCF corresponding to the S-CSCF Name carried in the LIA message.

16. The method of claim 1, further comprising:

receiving, by the HSS, a subscriber Location Inquiry Request (LIR) message from the I-CSCF in response to recording the current registration state of the UE;

returning, by the HSS, the I-CSCF an LIA carrying the S-CSCF Name, if a current public subscriber ID registration state of the UE is selected from the group consisting of a registered state, an unregistered state, and a not registered state, but one or more public subscriber ID registration states of the UE are selected from the group consisting of the registered state and the unregistered state; and

sending, by the I-CSCF an INVITE message to the S-CSCF corresponding to the S-CSCF Name carried in the LIA message.

17. The method of claim 1, further comprising:

receiving, by the HSS, a subscriber Location Inquiry Request (LIR) message from the I-CSCF in response to recording the current registration state of the UE;

returning, by the HSS, the I-CSCF an LIA carrying the S-CSCF Name if a current public subscriber ID registration state of the UE is a not registered state, but none of the other public subscriber ID registration states of the UE is selected from the group consisting of a registered state and an unregistered state, and the HSS stores the S-CSCF Name of the S-CSCF selected for the UE; and

sending, by the I-CSCF an INVITE message to the S-CSCF corresponding to the S-CSCF Name carried in the LIA message.

18. A method for implementing an Internet Protocol (IP) Multimedia Subsystem (IMS) registration, comprising:

recording the current registration state of a User Equipment (UE) and the Service Call Session Control Function (S-CSCF) Name of an S-CSCF in response to receiving a Multimedia Authentication Request (MAR) from the S-CSCF;

receiving a Register request of the UE initiated by an Interrogating Call Session Control Function (I-CSCF); and

returning the S-CSCF Name of the S-CSCF to the I-CSCF when the current registration state of the UE is an assigned S-CSCF state.

19. The method of claim 18, wherein the recording the current registration state of the UE comprises:

setting, by the HSS, a Pending Flag stored in the HSS to a Pending state.

20. The method of claim 19, wherein,

the current registration state of the UE is the assigned S-CSCF state when the current registration state of the UE is selected from the group consisting of a registered state, an unregistered state, and a not registered state;

and

the Pending Flag is set to be the Pending state.

21. The method of claim 18, wherein the recording the current registration state of the UE comprises:

recording, by the HSS, the current registration state of the UE as an Authentication Pending state, if the S-CSCF Name of the S-CSCF is not consistent with the S-CSCF Name stored in the HSS;

recording, by the HSS, the current registration state of the UE as the Authentication Pending state, if the S-CSCF Name of the S-CSCF is consistent with the S-CSCF Name stored in the HSS and the current registration state of the UE is selected from the group consisting of the unregistered state and the not registered state; and

recording, by the HSS, the current registration state of the UE as a registered state Pending state, if the S-CSCF Name of the S-CSCF is consistent with the S-CSCF Name stored in the HSS and the current registration state of the UE is not selected from the group consisting of the unregistered state and the not registered state.

22. The method of claim 21, wherein the current registration state of the UE is the assigned S-CSCF state when the current registration state of the UE is selected from the group consisting of the Authentication Pending state and the registered state.

23. The method of claim 18, wherein the current registration state of the UE is the assigned S-CSCF state when a current public subscriber ID registration state of the UE is selected from the group consisting of a registered state, an unregistered state, and a not registered state, but one or more of the other public subscriber ID registration states of the UE are selected from the group consisting of the registered state and the unregistered state.

24. The method of claim 18, wherein the current registration state of the UE is the assigned S-CSCF state when a current public subscriber ID registration state of the UE is the not registered state, and none of the other public subscriber ID registration states of the UE is selected from the group consisting of a registered state and an unregistered state, and the HSS stores the S-CSCF Name of the S-CSCF selected for the UE.