WO2006047951A1

WO2006047951A1 - An assigning method of charging identifier of application service

Info

Publication number: WO2006047951A1
Application number: PCT/CN2005/001834
Authority: WO
Inventors: Long Luo
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2004-11-04
Filing date: 2005-11-02
Publication date: 2006-05-11
Also published as: CN1770911A; CN100384296C

Abstract

An assigning method of charging identifier of application service, applies to that includes PoC terminals the system of IMS and PoC server; the method includes: a. after said IMS receives the pre-setup request for session from PoC terminal, assigns the charging identifier ICID of Internet protocol multimedia sub-system and sends the assigned ICID to the PoC server of said PoC terminal; b. as the calling party, said PoC terminal in the step (a) sends next setup request for session to itself IMS, the IMS assigns the calling party ICID for current calling party; c. said IMS in the step(b) informs the control PoC server of current session to assign ICID, the control PoC server assigns the called party ICID for each called party. Application the present invention can implement ICID assigning under session pre-setup manner in the PoC service.

Description

Billing identifier allocation method for application service

Technical field

The present invention relates to an application service technology based on the Internet Multimedia Subsystem (IMS), and in particular, to a charging identity allocation method for an application service in an IMS domain. Background of the invention

At present, OMA has developed the 3GPP Internet Multimedia Subsystem (IMS) open specification. The so-called IMS is a full Internet Protocol (IP) service drawing domain based on the packet bearer network, which can be applied to various networks such as mobile networks or fixed networks, IMS. The goal is to provide users with multimedia communication tests based on personalized, 用户3⁄4 user access methods, and control of the openness of business capabilities. In the IMS domain, the most important functional entities are the Call Session Control Function (CSCF) entity, the Media Gateway Control Function (MGCF) entity, the Application Server (AS), and the Home Subscriber Server (HSS). A session is established between the IMS entity and the IMS terminal based on a Session Initiation Protocol (SIP). There are three types of CSCF: Service Call Session Control Function (S-CSCF), Agent Call Control Function (P-CSCF), and Query Call Session Control Function (I-CSCF). When the application service carried by the S domain is a push-to-talk (PoC) service in the cellular system, the AS in the IMS domain is the PoC server (PoC Server) that processes the PoC service, and the S-CSCF is connected to the PoC server. Control the PoC business.

In addition, the IMS domain-based application service is a type of back-to-back user agent (B2BUA), and the PoC server is logically composed of two user agents (UA). Composition, the two UAs establish a session with the calling and called users and perform back-to-back interaction. That is to say: The session between the calling party and the called party established in the PoC service is actually composed of a session between the calling user and the PoC Server and a session between each called user and the PoC Server. In addition, for a PoC For the service session, the PoC Server is logically divided into two categories: Participating PoC Server and Controlling PoC Server. The Participating PoC Server is used to receive SIP signaling from the IMS entity for resolution and signaling. The Controlling PoC Server is routed to the current session through the IMS domain; the Controlling PoC Server is used for centralized control of the outgoing call and is responsible for integrated management, and the services of the primary 'call and called, and the current session according to the received SIP signaling. The attribute is analyzed and the SIP signaling is sent to the called party through the IMS domain. Thus, for a PoC service session, it includes the session between the calling party and the Controlling PoC Server and between each called party and the Controlling PoC Server. Session, each session corresponds to an IMS charging identifier (ICID), and the ICID is not shared.

In addition, the session establishment manner defined by the PoC service specification includes: a common session establishment mode, a session pre-establishment mode, and the like. In the normal session establishment mode, the Participating/Controlling PoC Server needs to perform session parameter negotiation according to the session parameters in the SIP signaling message after receiving the SIP signaling. The session parameters need to be sent by the IMS terminal to the SIP signaling when the call is initiated. The IMS domain usually occupies more bytes. Therefore, the transmission of the SIP signaling in the IMS domain will occupy a large amount of over-the-air radio resources and cause a long session establishment time. To solve this problem, the PoC service specification proposes a session pre-establishment method, that is, the PoC terminal first passes the invitation (INVITE) in the SIP protocol before the session is established; the message is negotiated with the Participating/Controlling PoC Server, and then passes through the media stream. Establishing an (Establish media) message, initiating a subsequent session establishment process, and omitting the session parameter negotiation process of the terminal in the subsequent session establishment process, in which case the K) C terminal does not have to send its session parameters to the IMS domain, The number of bytes occupied by the uploaded SIP signaling will also be greatly reduced, thereby saving air interface resources. Here, the Establish media message may be carried by a reference (REFER) message or an INVITE message in the SIP protocol. '

When the normal session establishment mode is adopted, the IMS domain will assign an IMS Charging Identity (ICID) to each session established, and use the calling user and the called party. Each session established between the users is associated, so that the PoC service session between the entire calling user and the called user is charged according to the associated ICID. Here, the ICID is allocated by the first entity related to the current session in the IMS domain, and then the allocated ICID is inserted into the PoC service charging vector in the SIP signaling message (transferred to the P-Charging-Vector header field) Other IMS entities. During the PoC session establishment process, the ICID assigned by the IMS domain to the user is stored in entities such as P-CSCF, S-CSCF, and PoC Server.

However, when the PoC session pre-establishment method is adopted, the ICID allocation method f has no standard to follow. Therefore, in the existing PoC service session pre-establishment process, the ICID of the calling and called terminal cannot be reasonably allocated, so that when the session pre-establishment is established, the CDR can be recorded due to the use of an inaccurate ICID. And generate billing '^ error. Summary of the invention

In view of the above, the main purpose of the present invention is to provide a charging identifier allocation method for an application service. When the PoC service adopts the session pre-establishment mode, the ICID of the session can be accurately allocated, thereby improving the ICID allocation mechanism of the PoC service.

In order to achieve the above, the technical solution of the present invention is implemented as follows: The present invention discloses a charging identity allocation method for an application service, which is applied to a system including: a PoC terminal, an IMS, and a PoC server; the method includes:

After receiving the session pre-establishment request from the PoC terminal, the IMS allocates an Internet Protocol Multimedia Subsystem Charging Identifier (ICID), and sends the allocated ICID to the PoC server to which the PoC terminal belongs;

b. Step a: The PoC terminal sends the IMS to which the subsequent session establishment request belongs as the calling party, and the IMS allocates the calling ICID to the current calling party;

c. The IMS in step b informs the controlling PoC server of the current session to allocate a CID, and the controlling PoC server allocates the called ICID to each called party. The calling and the PoC server to which the called party belongs are the control PoC server of the current session.

The PoC server to which the calling party belongs is the participating PoC server of the current session, and the PoC server to which the called party belongs has one and only one controlling PoC server of the current session. In step c, the IMS passes the PoC to which the calling party belongs. The server notifies the control PoC server.

The PoC server to which the calling party belongs is the controlling PoC server of the current session, and the PoC server to which the called party belongs is the participating PoC server of the current session; the step c further includes: the controlling the PoC server to allocate the called party The ICID is sent to the PoC server to which each called party belongs.

The PoC server to which the calling party belongs is the participating PoC server of the current session; the PoC server to which each called party belongs includes the participating PoC server of the current session; in step c, the IMS passes the PoC server to which the calling party belongs Notifying the control PoC server; the controlling PoC server further transmitting the called ICID assigned by itself to each of the called PoC servers to which the current session participates in the PoC server. '

In step a, the IMS sends the ICID to the PoC server by: the ICID is included in the session pre-establishment request and sent.

In step a, the ICID is included in a PoC Service Charging Vector (P-Charging-Vector) header field of the session pre-establishment request.

The step a further includes: the PoC server saving the ICID sent by the IMS.

In step b, the calling ICID is assigned by the proxy call session control function entity in the IMS.

In the step c, the IMS notifies the control PoC server that the ICID is allocated by: sending the calling ICID allocated in step b to the control PoC server to notify. ' In the step c, the method for the IMS to send the calling ICID to the controlling PoC server is: including the calling ICID in a subsequent session establishment request for sending. In step c, the calling ICID is included in the subsequent session setup request P-Charging-Vector header field.

The step c further includes: the control PoC server saves the calling ICID and the called ICID. '

In step c, the method for controlling the PoC server to send the called ICID to the called PoC server is: sending the called ICID in a session establishment request for sending.

In step c, the called ICID is included in the P-Charging-Vector header field of the session establishment request. In step c, the control PoC server sends the called ICID assigned by itself to the called PoC server by the IMS to which the call belongs and the IMS to which the called PoC server belongs.

The step c further includes: the PoC server to which each called party belongs stores the received ICIDs. ' ', wherein the called party sends a session pre-establishment request to the IMS to which it belongs before the step c; the IMS receives the session pre-establishment request from the called party, and divides the φ ICID, and assigns the assigned ICID Send to the PoC server to which the called party belongs.

It can be seen from the foregoing solution that the key to the present invention is: in the session pre-establishment process, the ICID is assigned by the IMS to which the PoC terminal belongs; in the subsequent session establishment process, the calling IC ID is assigned by the calling party to the IMS, and then the current session is The Controlling PoC Server assigns the called ICID.

Therefore, the charging identifier allocation method of the application service provided by the present invention can be applied to the PoC service session establishment process adopting the session pre-establishment mode, thereby being able to be based on the allocated ICID. The session pre-establishment process and the subsequent session establishment process are associated, so that the session in the pre-establishment mode can be accurately charged and the charging method of the PoC service can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

1 is a process flow of a preferred embodiment of an ICID allocation method during session pre-establishment of the present invention;

FIG. 2 is a schematic diagram of a process flow of a preferred embodiment of an ICID allocation method in a subsequent session establishment process after a caller pre-establishes a session according to the present invention. Mode for carrying out the invention'

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. month.

I

The method for allocating the charging service of the application service provided by the present invention is applied to a PoC service system including a PoC terminal, a PoC server, and an IMS, and is mainly applicable to a session establishment process in which the PoC service adopts the session pre-establishment mode. When the PoC terminal performs session pre-establishment, the IMS to which the PoC terminal belongs is assigned an ICID and saved, and the session parameter negotiation of the PoC terminal is completed. When the PoC terminal initiates subsequent session establishment, the IMS to which the PoC ends belongs to the caller ICID, and then the called ICID is assigned by the Controlling PoC Server of the current session, and the session establishment process is completed at the same time. Among them, the assigned calling ICID and called ICID usually need to be saved in IMS. :

FIG. 1 is a schematic diagram of a processing flow of a preferred embodiment of an ICID allocation method for session pre-establishment according to the present invention. As shown, a specific processing step comprises: ₍

Step 101: The PoC terminal sends an INVITE message to the P-CSCF in the IMS domain to which it belongs. The INVITE message includes at least: a user identifier of the PoC terminal, a flag indicating that the message is a session pre-establishment message, and a user IP address and port. Session parameters such as number and voice codec format. Here, the PoC service adopts the session pre-establishment mode only for the PoC terminal, and the P-CSCF in the IMS domain is responsible for receiving the SIP signaling of the local network PoC terminal, so the IMS entity receiving the INVITE message is the P-CSCF.

Step 102: Step 101: The P-CSCF that receives the INVITE message allocates an ICID to the PoC terminal to identify the session pre-establishment process. Then, the P-CSCF includes the allocated ICID in the P-Charging-Vector header field of the INVITE message, and then sends the INVITE message to the S-CSCF to which the PoC terminal belongs through the I-CSCF. '

The I-CSCF and the S-CSCF through which the INVITE message passes will save the ICID in the transmission of the INVITE message containing the ICID. Here, the process of transmitting the INVITE message between the IMS entities is a well-known technology and will not be described in detail herein.

Step 103: The S-CSCF to which the PoC terminal belongs forwards the INVITEE message in the step 102 to the PoC server to which the PoC terminal belongs, and the PoC server performs session parameter negotiation according to the session parameters carried in the INVITE message, and saves the final negotiation. ^ The session parameter, while reading the ICID in the P-Charging-Vector header field of the message and saving it locally.

Here, in the session parameter negotiation, the session parameters sent by the PoC terminal for the first time may not be supported by the PoC server, and the PoC Server returns the session parameters supported by the PoC to the PoC terminal, and finally obtains the two sides through the interaction of the SIP signaling. The negotiation result of the session parameters, the processing procedure of the specific session parameter negotiation is a well-known technology, and will not be described in detail herein. : ' : Steps 104 ~ 105: Step 103: The PoC Server sends a 200 OK message to the IMS entity, and the IMS entity forwards the 200 OK message to the PoC terminal, and the session pre-establishment is completed.

For a PoC service session, the IMS to which the calling party belongs may be the same or different from the IMS to which the called party belongs. The PoC Server to which the calling and the called party may be the same or different. In addition, for the PoC session, the Controlling PoC Server is unique. In a temporarily defined group session, the Controlling PoC Server is the PoC Server to which the calling party of the session belongs. In a group session in a predefined or chat mode, the Controlling PoC Server is the PoC Server to which the group administrator belongs, and the PoC Server to which the other users of the session belong is the Participating PoC Server, so the Controlling Server of the current session It may be the PoC Server to which the calling party and/or the called party belong, but neither affects the effectiveness of the present invention. The following is a detailed description of the method for assigning the ICID in the subsequent session establishment after the pre-establishment of the session of the present invention by taking the IMS of the calling and the called party differently, and the PoC Server to which the calling party belongs as the example of the Controlling PoC Server of the session.

FIG. 2 is a schematic diagram of a process flow of a preferred embodiment of an ICID allocation method in a subsequent session establishment process after a session pre-establishment according to the present invention. As shown in Figure 2, the processing flow includes

Step 201: The calling PoC terminal completes the session pre-establishment and the parameter negotiation according to the method shown in FIG. 1, and sends a subsequent session establishment request, that is, an Establish media message, to the P-CSCF in the IMS to which the calling PoC terminal belongs.

Here, since the PoC Server has completed the session number negotiation in the session pre-establishment process and saves the session parameters of the calling PoC terminal, the Established media message does not need to carry the session parameter, and the PoC Server identifies the Established media message. The caller ID in the middle can obtain the session parameters of the calling PoC terminal saved by itself. The Establish media message includes a calling identity and includes one or more called identifiers.

Step 202: The P-CSCF allocates a calling ICID to the calling PoC terminal, and the ICID is included in the P-Charging-Vector header field of the Established media message to be forwarded to the S- to which the PoC terminal belongs. CSCF. : .

Step 203: The S-CSCF forwards the Established media message including the calling ICID to the PoC server to which the calling PoC terminal belongs, and the PoC Server obtains the calling PoC terminal according to the calling identifier in the received Established media message. Corresponding session parameters to prepare for session establishment.

Step 204: The PoC Server to which the calling party belongs is the Controlling PoC of the current session. The server assigns the called ICID to each called party according to each called identifier in the Established media message.

The Establish media message described in the above steps 201 to 204 may be carried by the REFER message in the SIP protocol.

Step 205 ~ Step 206: The Controlling PoC Server is described in step 204.

The called identity in the Establish media message constructs a session establishment request, that is, a new 'Set media message, the UA as the calling PoC terminal initiates a call to each called party, and the called ICID assigned in step 204 is included in the Established media message. In the P-Charging-Vectpr header field, the Established media message is sent to the IMS to which each called party belongs through the IMS to which it belongs. The following is the process of the Controlling PoC Server sending a called ICID to the PoC 'Server to which the called party belongs. For each called ICID of the current session and its corresponding called PoC Server, the following will be performed as follows: Processing.

Step 207: The IMS to which the called party belongs forwards the Estab ish media message containing the called ICID to the PoC Server to which the called party belongs.

If the PoC Server to which the calling party belongs is a Participating PoC Server and the PoC Server to which the called party belongs has one and only one is a Controlling PoC Server, then in step 204, the Poin Server, which is the PoC Server to which the called party belongs, is allocated and saved. The called ICID does not need to perform steps 205 to 207. If the calling PoC Server is a Participating PoC Server, and the called PoC Server includes a Participating PoC Server, the PoC Server to which the calling party belongs is routed to the Controlling PoC Server of the current session, step 204 Each of the called ICIDs is allocated by the Controlling PoC Server. In step 205 to step 207, the called ICID is sent by the Controlling PoC Server to the corresponding PoC Server to which the called party belongs. Since the possible situations include: 1. The called PoC belongs to the PoC. Server is one or more, and all are Participating The PoC Server has two PoC Servers, and one of them is a Controlling PoC Server, and the other is a Participating PoC Server. Therefore, for the second case, the Controlling PoC Server is one of the PoCs to which the called party belongs. In the case of Seryer, in step 204, the Controlling PoC Server is configured to include the ICID of the called party in its own jurisdiction, and in steps 205 to 207, the ICIDs of the called parties other than the called party are managed to be distributed to the corresponding ICID. Each called party belongs to the PoC Server.

The Controlling PoC Server and the Participating PoC Server may belong to different IMS domains or belong to the same IMS domain. The PQC servers in the same IMS domain can communicate with each other through the IMS domain to which they belong. The PoC Servers in the IMS domain need to perform signaling interaction through their respective IMS domains. The details of the signaling interactions are well-known technologies and will not be described in detail here. : Step 208: The PoC server to which the called party belongs sends an Established media message to the called PoC terminal through the IMS to which the called party belongs, and performs the called response process. Here, when the called PoC Server sends the Establish media message, save the called ICID in the P-Charging-Vector header field of the Establish media message locally, delete the P-Charging-Vector header field, and then The established media message is delivered to the called PoC terminal through the IMS of the called party. : : Because there are many ways to answer the called party, such as: manual answer, automatic answer, etc., using different answering methods, the called responding process of the called PoC Server will be different from j; and, depending on whether the called party is pre-established session has been completed, the process is also called response region of another ¹ J; Thus, PoC Server called party belongs is called response process there are a variety of ways, but belong to the known art, the present invention is a non-defined The scope of the figure is no longer described in the figure. Wherein, the Establish media message described in the foregoing steps 205 to 208 is carried by the INVITE message in the SIP protocol. ; ' Step 209 ~ Step 213: The called PoC Server belongs to the IMS to which the called party belongs The acknowledged (ACCEPT) message responds to the Established Media message described in step 207, and then the ACCEPT message is forwarded to the IMS to which the calling party belongs, the PoC Server to which the calling party belongs, and finally reach the calling PoC terminal through the IMS to which the calling party belongs. The acknowledgment of the Establish media message in the step 206, the step 205, the step 203, and the step 201 is performed, so that the calling and the called party complete the session establishing process, and the media stream transmission of the PoC service can be started. The ACCEPT message may be carried by a 200 OK or A (^ message) in the SIP protocol.

In this embodiment, the called PoC terminal may have passed the session pre-establishment process shown in FIG. 1, that is, the called PoC terminal described in FIG. 2 has sent the session pre-establishment to the IMS to which it belongs; the IMS receives The ICID is allocated after the session pre-establishment request, and the allocated ICID is sent to the PoC server to which the called PoC terminal belongs. However, regardless of whether the called PoC terminal has undergone pre-established processing, the processing flow of the method of the present invention is not affected, and is within the scope of the present invention.

In the above process, each IMS entity in the IMS domain to which the calling party belongs reads the P-Charging-Vect0r header field in the message when the Easy media message containing the calling ICID is transmitted, and the calling ICID is included in the message. Save it locally. Similarly, each IMS entity in the IMS domain of the called party also reads the P-Charging-Vector header field in the message when transmitting the Establish media message containing the called ICID, and saves the called ICID in the local . In addition, for the Controlling PoC Server of the current session, when the Received Media message containing the calling ICID is received, the calling ICID is saved locally, and the called ICID is also saved locally after the called ICID is assigned. After the calling and/or called ICIDs are saved by the IMS entities that are in contact with the current session, the IMS domain can associate the ICIDs to record the current PoC service session. Accurate billing. Here, the method for associating an ICID is not the focus of the present invention. For details, please refer to another patent application file of the applicant, which will not be described in detail herein. ' In summary, the method of the present invention can allocate an ICID to the calling and called parties of the current session when the session is established by using the PoC pre-establishment mode, and the ICID allocation method of the existing PoC service is improved, so that the session can be correctly correlated. The action performs billing processing.

The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

Claim

A method for allocating a charging identifier of an application service, comprising: a system for pressing a key, that is, a service PoC terminal, an Internet Protocol multimedia subsystem, an IMS, and a PoC server; and the method includes:

a. The IMS receives the session pre-establishment request from the PoC terminal, and assigns the assigned ICID to the PoC server to which the PoC terminal belongs;

b. Step a, the PoC terminal sends a subsequent session establishment request to the IMS to which the call belongs, and the IMS allocates the calling ICID to the current calling party;

c. Step b: The IMS notifies the control session of the current session that the PoC server is divided into ICIDs, and the control PoC server allocates the called ICIDs for each called party.

2. The method according to claim 1, wherein the calling party is the same as the called PoC server and is the controlling PoC server of the current session.

The method according to claim 1, wherein the calling PoC server is a participating PoC server of the current session, and the called PoC service has one and only one control PoC server of the current session. ; Step: In step c, the IMS notifies the controlled PQC server by the PoC server to which the calling party belongs.

The method according to claim 1, wherein the caller belongs to the P0C server as the control PoC server of the current session, and the called PoC server is the participating PoC server of the session;

The step c further includes: the control PoC server sends the called ICID assigned by itself to the PoC server to which each called party belongs.

5. The method according to claim 1, wherein said calling party is "PoC" The server is a participating PoC server of the current session; the participating PoC server includes the participating PoC server of the current session;

In step c, the IMS notifies the control PoC server by the PoC server to which the calling party belongs; the control PoC server further sends the called ICID assigned by itself to the PoC server to which the current session participates in the PoC server. '

The method according to any one of claims 1 to 5, characterized in that, in step a, the method for the IMS to send the ICID to the PoC server is: the ICID is included in a session pre-establishment request. Send it. ;

The method according to claim 6, wherein in step a, the ICID is included in a PoC service charging vector P-Charging-Vector header field of a session pre-establishment request.

The method according to any one of claims 1 to 5, wherein the step a further comprises: the PoC server saving an ICID sent by the IMS.

The method according to any one of claims 1 to 5, wherein in step b, the calling ICID is allocated by a proxy call session control function entity in the IMS.

The method according to any one of claims 1 to 5, wherein, in step c, the IMS notifies the control PoC server that the method for assigning the ICID is: |t the sending the caller assigned in step b ICID to the control PoC server to notify.

The method according to claim 10, wherein, in step c, the method for the IMS to send the calling ICID to the controlling PoC server is: including the calling ICID in a subsequent session establishment request Send in.

The method according to claim 11, wherein in step c, the called ICID is included in a P-Charging-Vector header field of a subsequent session establishment request.

The method according to claim 10, wherein the step c further comprises: the controlling PoC server saving the calling ICID and the called ICID.

The method according to claim 4 or 5, wherein, in step c, the method for controlling the PoC server to send the called ICID to the called PoC server is: The called ICID is included in the session establishment request for transmission. '

The method according to claim 14, wherein in step, the called ICID is included in a P-Charging-Vector header field of the session establishment request.

The method according to claim 4 or 5, wherein, in step c, the controlling PoC server sends the called ICID assigned by itself to the IMS to which the IMS belongs to the IMS to which the called party belongs. The called PoC server. ■

The method according to claim 4 or 5, wherein the step c further comprises: the PoC server to which each called party belongs stores the respective received called ICID.

The method according to any one of claims 1 to 5, wherein the called party sends a session pre-establishment request to the IMS to which it belongs before the step c; the IMS receives the called party After the session pre-establishment request, the ICID is assigned, and the assigned ICID is sent to the PoC server to which the called party belongs.