WO2007131433A1

WO2007131433A1 - A method and system for routing subscription request message

Info

Publication number: WO2007131433A1
Application number: PCT/CN2007/001461
Authority: WO
Inventors: Zhenhua Ouyang
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2006-05-12
Filing date: 2007-04-29
Publication date: 2007-11-22
Also published as: CN1968291A; CN100558116C

Abstract

A method and system for routing the subscription request message, solve the problem that presently the default IMPU must be needed to be SIP-URI when P-CSCF initiates the subscription. At the same time, the problems that presently the route efficiency is lower and the network source is used much when the P-CSCF initiates the subscription. The method comprises: A. after the user registers successfully, the P-CSCF transmits the subscription request message to the network side and the address of the S-CSCF registered by the user is carried in the said subscription request message; B. the network side completes the route according to the address of the S-CSCF carried in the subscription request message. By implementing the method of the present invention, DNS and HSS need not be queried whether the default format is SIP-URI or TEL-URI, it is obvious that the route efficiency is improved and the network source is saved.

Description

Method and system for routing subscription request message

Technical field

The present invention relates to the field of wireless networks, and in particular, to a method and system for routing subscription request messages. Background technique

IMS is a separate session domain controlled by the CSCF (Call Session Control Function). The 3GPP completely defines the IMS interface, networking and service flow.

The following describes the main business of IMS:

1. Registration: If an IMS user wants to conduct a session, he must first register. The process of registration is the process of registering a user's location on the network.

2. The P-CSCF subscribes to the registration status of the user: After receiving the registration success message, the P-CSCF needs to subscribe to the IMPU status registered by the user, and according to the SIP protocol: The P-CSCF must first send a subscription request message (Subscriber Message) to the S-CSCF; After the subscription is completed, when the registration status of the user changes, the P-CSCF receives the logout notification (Notify message) sent by the network side; the P-CSCF needs to follow the logout notification (Notify message). Log out user data in time to maintain the consistency of user registration status on the network.

3. Network side logout: Due to contract data change, arrears, registration timeout or other management reasons, the network side will send a Notify message (logout notification) according to the local policy to notify the P-CSCF to log off the user data.

The existing P-CSCF subscribes to the registration process of the registration status to the network side. As shown in Figure 1, the following main steps are included:

Step 1: After receiving the 200 message of successful registration (see Table 1 for the content of the successfully registered 200 message), the P-CSCF extracts and saves the user's default IMPU (userl_publicl@homel.net); and fills in the MRU. Go to the Request-URI and To header fields of the subscription request message (see Table 2 for the contents of the subscription request message). The IMPU must be in the SIP-URI format. According to the SIP protocol, the subscription request message sent by the P-CSCF is routed according to Request-U I. Since the IMPU is in the SIP-U I format (sip:userl_publicl@homel.net), the SIP protocol stack uses the homel.net part for DNS query to obtain the address of the query session control function entity I-CSCF in the home domain.

Step 2: The P-CSCF sends the subscription request message to the I-CSCF according to the obtained address of the I-CSCF.

Step 3: The I-CSCF obtains the address of the S-CSCF registered by the user by querying the home subscriber server HSS.

Step 4: The I-CSCF sends the subscription request message to the S-CSCF according to the obtained address of the S-CSCF.

Step 5-6: After receiving the subscription request message, the S-CSCF returns a 200 message and reaches the P-CSCF through the I-CSCF.

Step 7: The S-CSCF takes the IMPU that the P-CSCF requests from the TO header field, and carries the current registration status of the corresponding user in the subscription response message and sends it to the P-CSCF.

Step 8: After receiving the subscription response message, the PCSCF returns a 200 successful response.

SUBSCRIBE sip:user l_publicl @homel .net SIP/2.0

Table II

The routing process of sending the subscription request message to the network side by using the above-mentioned existing P-CSCF is as follows: Since the DNS query of the user's IMPU needs to be performed in the initial stage of the route, the IMPU must be in the SIP-URI format; if the default IMPU For the TEL1-URI format (for example: tel:+358-555-1234567), routing is not possible.

Moreover, when the P-CSCF initiates a subscription, DNS and HSS queries are required, which reduces efficiency and also consumes network resources. Summary of the invention

The embodiment of the present invention provides a method for routing a subscription request message, which is used to solve the problem that the current P-CSCF initiates a subscription, and the default IMPU must be required to be a SIP-URI. At the same time, it is used to solve the problem that the current P-CSCF initiates a subscription with a low routing efficiency and consumes a large amount of network resources.

The method of the embodiment of the present invention includes: A. After the user is successfully registered, the P-CSCF sends a subscription request message to the network side, where the subscription request message carries the address of the S-CSCF registered by the user; B, the network side subscribes The S-CSCF address carried in the request message completes the route.

The system of the embodiment of the present invention includes: a P-CSCF, configured to receive a registration success message, where the registration success message includes an address of the S-CSCF; generate a subscription request message according to the address of the S-CSCF, and send the message to the network side. ; network-side related network element, used to carry the S-CSCF in the subscription request message The address completes the route.

In the embodiment of the present invention, after the user is successfully registered, the address of the S-CSCF carried in the registration success message sent by the S-CSCF registered by the user to the P-CSCF is subscribed when the P-CSCF initiates a subscription request to the network side. The request message carries the address of the S-CSCF; so that the network side can directly route the subscription request message to the S-CSCF registered by the user according to the S-CSCF address carried in the subscription request message, to complete the P-CSCF to the user. The subscription status of the subscription.

The embodiment of the present invention can route the subscription request message to the S-CSCF without performing a DNS query, so even if the default IMPU is a TEL-URI, the route can be completed without the default format of the IMPU being TEL-URI. As a result of the failure of the route, the technical effects not found in the prior art are achieved. Moreover, the routing efficiency is improved, and network resources are also saved. DRAWINGS

FIG. 1 is a flow chart of subscription routing of an existing P-CSCF;

2 is a flow chart of steps of a method according to an embodiment of the present invention;

3 is a schematic structural diagram of a system according to an embodiment of the present invention;

4 is a flow chart of Embodiments 3 and 4 of the present invention. detailed description

In order to make the subscription request initiated by the P-CSCF compatible with the default IMPU as the TEL-URI, and to improve the routing efficiency and save the network resources, the embodiment of the present invention provides a method for routing a subscription request message, as shown in FIG. 2, Includes the following main steps:

51. The user has successfully registered.

52. The P-CSCF encapsulates the subscription request message.

53. The P-CSCF sends a subscription request message to the network side.

54. The network side routes the subscription request message to the S-CSCF.

55. The S-CSCF returns a subscription response message to complete the subscription.

An embodiment of the present invention further provides a system for routing a subscription request message, as shown in FIG. 3, It includes: P-CSCF and network-side related network elements.

The P-CSCF is configured to receive a registration success message, where the registration success message includes an address of the S-CSCF, and generate a subscription request message according to the address of the S-CSCF, and send the message to the network side.

The network-side related network element is configured to complete the route by using the S-CSCF address carried in the subscription request message. Embodiment 1 If the route hiding mode is not adopted, the system includes: a P-CSCF, a network side related network element, and an S-CSCF.

The S-CSCF is configured to send a registration success message, where the registration success message carries the address of the S-CSCF.

The P-CSCF receives the registration success message, and the registration success message includes the address of the S-CSCF. The subscription request message is generated according to the address of the S-CSCF, and is sent to the network side.

The network-side related network element is configured to complete the route by using the address of the S-CSCF carried in the subscription request message.

Embodiment 2: If the route hiding mode is adopted, the system includes: a P-CSCF, an I-CSCF/IBCF, an S-CSCF, and a network element related network element.

The S-CSCF is configured to send a registration success message, where the registration success message carries the address of the S-CSCF and the I-CSCF IBCF address.

The I-CSCF/IBCF is configured to receive the registration success message, encrypt the S-CSCF address in the registration success message, and forward the message to the P-CSCF.

The network-side related network element is configured to complete the route by using the address of the S-CSCF carried in the subscription request message. The network-side related network element is specifically an I-CSCF/IBCF, configured to decrypt the encrypted S-CSCF address in the subscription request message, and route the subscription request message to the decrypted S-CSCF address to The corresponding S-CSCF.

Embodiment 3: When the default IMPU is a SIP-URI, the subscription is not completed through the I-CSCF. Referring to Figure 4, this example includes the following specific steps:

Step 1. After the user successfully registers in the IMS domain, the S-CSCF registered by the user will be sent to the user side. A registration success message (200 OK message) carrying the current S-CSCF address and the user's IMPU (SIP-URI) is sent, for example: The message can be seen in Table 3. The address of the S-CSCF is carried in the Service-Route header field.

SIP/2.0200 OK

Via:

Path:

Service-Route: <sip:orig@scscfl .home 1.net;lr>

From:

To:

Call-ID:

Contact: <sip: [5555:: aaa:bbb:ccc:ddd]: 1357;comp=sigcomp>;expires=600000

CSeq:

Date: Wed, 11 July 2001 08:49:37 GMT

P- Associated-U I :<sip: user 1 _public 1 @ omel .ne1>,<sip: user 1 _public2@home 1.net>, <sip:+l -212-555-1111 @homel .net;user =p one>

Content-Length: Table 3

After receiving the registration success message, the P-CSCF may extract the address of the S-CSCF registered by the user from the Service-Route header field, that is, sip:orig@scscfl.homel.net;lr, and extract from the registration success message. The user's IMPU, ie userl_publicl@homel.net.

After the extraction is completed, the P-CSCF can encapsulate the subscription request message (Subscriber message) with the extracted information. The P-CSCF fills the extracted IMPU of the user into the Request-URI and To header fields of the subscription request message to indicate the subscribed object; and fills in the address of the extracted user-registered S-CSCF to the subscription request message. The R _ou t _e header field is used to indicate the destination address of the route. The encapsulation request message after encapsulation is shown in Table 4.

CSeq: 61 SUBSCRIBE

Event: reg

"Expires: 600000

Accept: application/reginfo+xml

Contact: <sip:pcscfl .visited 1.net Table 4

After the encapsulation is completed, the P-CSCF sends the address of the S-CSCF with the user registration and the subscription request message of the IMPU of the user to the network side. The network side directly routes the message to the destination S-CSCF according to the address of the S-CSCF carried in the subscription request message. No DNS and HSS queries are required on the way, which improves routing efficiency and saves network resources.

This completes the routing of the subscription request message sent by the P-CSCF.

Step 2: After receiving the subscription request message, the S-CSCF returns 200 OK to notify the P-CSCF that the subscription request message is received.

Step 3: The S-CSCF extracts the IMPU from the Request-URI or the To header field, and searches for the current registration status of the user corresponding to the IMPU from the local end. Thereafter, the registration status is carried in a subscription response message (Notify message) and sent to the P-CSCF. The P-CSCF may perform corresponding modification or cancellation of the registration information of the user according to the registration status carried in the subscription response message.

Step 4: After receiving the subscription response message, the P-CSCF returns 200 OK to inform the S-CSCF that the subscription response message is received. This completes the subscription of the P-CSCF to the user's registration status.

Then, when the registration status of the user changes, the S-CSCF actively sends a subscription response message carrying the updated registration status to the P-CSCF to ensure that the P-CSCF can correct or cancel the registration information of the user in time. To maintain the consistency of user registration status on the network.

Embodiment 4: When the default IMPU is a TEL-URI, the subscription is not completed through the I-CSCF. Referring to Figure 4, this example includes the following specific steps:

Step 1. After the user successfully registers in the IMS domain, the S-CSCF registered by the user sends a registration success message (200 OK message) carrying the S-CSCF address and the IMPU (TEL-URI) of the user to the user side, for example. : The message can be seen in Table 5. The address of the S-CSCF is carried in the Service-Route header field.

Table 5

After receiving the registration success message, the P-CSCF may extract the address of the S-CSCF registered by the user from the Service-Route header field, that is, sip:orig@scscfl.homel.net;lr, and extract from the registration success message. The user's IMPU, ie tel: +358-555-1234567.

After the extraction is completed, the P-CSCF can encapsulate the subscription request message (Subscriber message) with the extracted information. The P-CSCF fills the extracted IMPU of the user into the Request-URI and To header fields of the subscription request message to indicate the subscribed object; and fills in the address of the extracted user-registered S-CSCF to the subscription request message. R _0Ute header field, used to indicate the destination address of the route. The encapsulation request message after encapsulation is shown in Table 6.

SUBSCRIBE tel: +358-555-1234567 SIP/2.0

" Via: SIP/2.0/UDP pcscf 1.visited 1.net;branch=z9hG4bK240f34.1

Max-Forwards: 70

Route: <sip:orig@scscfl .homel.net;lr>

P-Asserted-Identity: <sip:pcscfl .visitedl .net>

Privacy: none

From: <sip:pcscfl .visited 1.net>;tag=31415

"To: < tel:+358-555-1234567>

"Call-ID: dre36d2v32gnlgiiomm72445

"CSeq: 61 SUBSCRIBE

Event: reg

"Expires: 600000

Accept: application/reginfo+xml

Contact: <sip:pcscfl .visitedl .net> Table 6

After the encapsulation is completed, the P-CSCF sends the address of the S-CSCF with the user registration and the subscription request message of the IMPU of the user to the network side. The network side directly routes the message to the destination S-CSCF according to the address of the S-CSCF carried in the subscription request message. No DNS query is required on the way, so the default IMPU is compatible with TEL-URI; no DNS and HSS queries are required on the way, which improves routing efficiency and saves network resources.

Step 4: After receiving the subscription response message, the P-CSCF returns to 200 OK to inform the S-CSCF that the subscription response message is received. This completes the subscription of the P-CSCF to the user's registration status.

Embodiment 5: The SIP-URI is used as the default format of the IMPU, and the route is hidden, and the subscription is completed through the I-CSCF. This example includes the following specific steps:

Step 11. After the user successfully registers in the IMS domain, the S-CSCF registered by the user sends a registration success message (200 OK message) carrying the S-CSCF address and the IMPU (SIP-URI) of the user to the user side. The address of the S-CSCF is carried in the Service-Route header field. Because of the hidden route, when passing the I-CSCF, the I-CSCF adds its own address to the Service-Route header field and encrypts the S-CSCF. address. The message is sent to the P-CSCF after processing is complete.

After receiving the registration success message, the P-CSCF saves the Service-Route and extracts the IMPU of the user from the registration success message. After the extraction is completed, the P-CSCF may encapsulate the subscription request message (Subscriber message) by using ServiceRoute and the information of the user's IMPU. The P-CSCF fills out the extracted IMPU of the user into the Request-URI and To header fields of the subscription request message to indicate the subscribed object; and fills in the saved ServiceRoute into the Route header field of the subscription request message.

After the encapsulation is completed, the P-CSCF will carry the address of the encrypted S-CSCF registered by the user.

The address of the I-CSCF and the subscription request message of the IMPU of the user are sent to the network side. The network side routes the message to the destination I-CSC according to the address of the I-CSCF carried in the subscription request message.

After receiving the subscription request message, the I-CSCF decrypts the encrypted S-CSCF address, and forwards the subscription request message to the S-CSCF with the decrypted S-CSCF address as the destination address.

Step 12 is the same as step 2.

Step 13 is the same as step 3.

Step 14 is the same as step 4.

Embodiment 6: When the default IMPU is a SIP-URI, there is a route hiding, and the subscription is completed through the I-CSCF. This example includes the following specific steps:

Step 21: After the user successfully registers in the IMS domain, the S-CSCF registered by the user sends the address (THIG) carrying the S-CSCF address, the I-CSCF, and the IMPU of the user: (SIP-URI) to the user side. Registration success message (200 OK message), where the address of the S-CSCF and the address of the I-CSCF are carried in the Service-Route header field. Due to the hidden route, the I-CSCF encrypts the S-CSCF address in the Service-Route header field when passing the I-CSCF. The I-CSCF sends the processed registration success message to the P-CSCF.

After receiving the registration success message, the P-CSCF saves the Service-Route and extracts the IMPU of the user from the registration success message.

After the extraction is completed, the P-CSCF may encapsulate the subscription request message (Subscriber message) by using Service-Route and the information of the user's IMPU. The P-CSCF fills the extracted IMPU of the user into the Request-URI and To header fields of the subscription request message to indicate the subscribed object; and fills the saved Service-Route into the Route header field of the subscription request message. After the encapsulation is completed, the P-CSCF sends the address of the S-CSCF with the encrypted user registration, the address of the I-CSCF, and the subscription request message of the IMPU of the user to the network side. The network side routes the message to the destination I-CSCF according to the address of the I-CSCF carried in the subscription request message.

Step 22 is the same as step 2.

Step 23 is the same as step 3.

Step 24 is the same as step 4.

Embodiment 7: When the default IMPU is SIP-U I, there is a route hiding, and the topology is hidden by IBCF (THIG) to complete the subscription. This example includes the following specific steps:

Step 31: After the user successfully registers in the IMS domain, the S-CSCF registered by the user sends the address carrying the current S-CSCF address, the IBCF address (TfflG), and the user's IMPU (SIP-URI) to the user side. Message (200 OK message), where the address of the S-CSCF and the address of the IBCF are carried in the Service-Route header field. Due to the hidden route, the IBCF encrypts the S-CSCF address in the Service-Route header field when passing the IBCF. The IBCF sends the processed registration success message to the P-CSCF.

After the extraction is completed, the P-CSCF can encapsulate the subscription request message (Subscriber message) by using Service-Route and the information of the user's IMPU. The P-CSCF fills in the extracted IMPU of the user into the Request-URI and To header fields of the subscription request message to indicate the subscribed object; and fills the saved Service-Route into the Route header field of the subscription request message.

After the encapsulation is completed, the P-CSCF sends the address of the S-CSCF with the encrypted user registration, the address of the IBCF, and the subscription request message of the IMPU of the user to the network side. The network side routes the message to the destination IBCF according to the address of the IBCF carried in the subscription request message.

After receiving the subscription request message, the IBCF decrypts the encrypted S-CSCF address, and The subscription request message is forwarded to the S-CSCF with the decrypted S-CSCF address as the destination address. This completes the routing of the subscription request message sent by the P-CSCF.

Step 32 is the same as step 2.

Step 33 is the same as step 3.

Step 34 is the same as step 4.

In summary, in the embodiment of the present invention, after the user is successfully registered, the address of the S-CSCF carried in the registration success message sent by the S-CSCF registered by the user to the P-CSCF is initiated by the P-CSCF to the network side. When the request is received, the address of the S-CSCF is carried in the subscription request message, so that the network side can directly route the subscription request message to the S-CSCF registered by the user according to the S-CSCF address carried in the subscription request message, to complete The P-CSCF subscribes to the user's registration status. Therefore, the embodiment of the present invention can route the subscription request message to the S-CSCF without performing a DNS query, so even if the default IMPU is a TEL-URI, the route can be completed without the default format of the IMPU being TEL-URI. As a result of the routing failure, the technical effects not found in the prior art are achieved. It also improves routing efficiency and saves network resources.

Further, the present invention also discloses a scheme using a route hiding mode and a route hiding mode. The spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of the inventions

Claims

Rights request

A method for routing a subscription request message, comprising the following steps:

A. After the user is successfully registered, the P-CSCF sends a subscription request message to the network side, where the subscription request message carries the address of the S-CSCF registered by the user.

B. The network side completes the route by using the S-CSCF address carried in the subscription request message.

2. The method according to claim 1, wherein if the route hiding mode is not used, the step A includes:

After the user is successfully registered, the S-CSCF registered by the user sends a packet to the P-CSCF.

The registration success message of the S-CSCF address;

A12. The P-CSCF extracts an address of the S-CSCF registered by the user.

A13. The P-CSCF carries the address of the S-CSCF in the subscription request message, and sends the message to the network side. .

The method according to claim 2, wherein in the step B, the network side directly routes the subscription request message to the corresponding S-CSCF by using the S-CSCF address carried in the subscription request message.

4. The method of claim 2, wherein the address of the S-CSCF is carried in a routing header field of a subscription request message.

5. The method according to claim 1, wherein if the route hiding mode is adopted, the step A includes:

A21. After the user is successfully registered, the S-CSCF registered by the user sends a registration success message carrying the S-CSCF address to the I-CSCF.

A22. The I-CSCF encrypts the S-CSCF address in the registration success message, and adds the I-CSCF address to the registration success message, and forwards the message to the P-CSCF.

A23. The P-CSCF carries the encrypted S-CSCF address and the I-CSCF address in the subscription request message, and sends the message to the network side.

6. The method according to claim 1, wherein if the route hiding mode is used, Step A includes:

A21. After the user is successfully registered, the S-CSCF registered by the user sends a registration success message carrying the current S-CSCF address and the I-CSCF/IBCF address to the I-CSCF/IBCF.

A22. The I-CSCF IBCF encrypts the S-CSCF address in the registration success message and forwards it to the P-CSCF.

A23. The P-CSCF carries the encrypted S-CSCF address and the I-CSCF/IBCF address in the subscription request message, and sends the message to the network side.

7. The method according to claim 6, wherein the step B includes:

B21: The I-CSCF decrypts the encrypted S-CSCF address in the subscription request message; B22, the I-CSCF routes the subscription request message to the corresponding S-CSCF address by using the decrypted S-CSCF address.

S-CSCF.

8. The method according to claim 6, wherein the step B includes:

B21. The IBCF decrypts the encrypted S-CSCF address in the subscription request message.

B22. The IBCF routes the subscription request message to the corresponding S-CSCF by using the decrypted S-CSCF address.

9. The method of claim 6, wherein the address of the I-CSCF is carried in a routing header field of a subscription request message.

The method according to any one of claims 2 to 9, wherein the subscription request message and the registration success message further carry the public identifier IMPU of the user.

11. The method according to claim 10, wherein the IMPU comprises: a session initiation protocol universal resource identifier SIP-URI and a telephone universal resource identifier TEL-URL

12. The method according to claim 11, wherein the step B further comprises the following steps:

Cl, the S-CSCF receives the subscription request message, and extracts the IMPU therefrom;

C2: The S-CSCF searches for the current registration status of the user corresponding to the IMPU from the local end; C3. The registration status is carried in the subscription response message, and is sent to the P-CSCF, and the subscription is completed.

A system for routing a subscription request message, comprising:

a P-CSCF, configured to receive a registration success message, where the registration success message includes an address of the S-CSCF, and generate a subscription request message according to the address of the S-CSCF, and send the message to the network side;

The system according to claim 13, wherein, if the route hiding mode is not adopted, the system further includes: an S-CSCF, configured to send a registration success message, where the registration success message carries the S - The address of the CSCF.

The system according to claim 13, wherein, if the route hiding mode is adopted, the system further includes: an S-CSCF, configured to send a registration success message, where the registration success message carries the S- The address of the CSCF and the I-CSCF/IBCF address.

The system of claim 15, wherein the system further comprises:

The system according to claim 16, wherein the network-side related network element is an I-CSCF IBCF, configured to decrypt the encrypted S-CSCF address in the subscription request message, and after decryption The S-CSCF address, routing the subscription request message to the corresponding S-CSCF.