Method and device for interaction between IMS domain and PS domain when establishing dedicated bearer for one card dual number call

Abstract

The present invention relates to the field of communications, and aims to solve the problem that in a one-card dual-number service state, a dedicated bearer cannot be established due to the inconsistency of user identifiers in the IMS domain and the PS domain, which affects normal communication. The present invention provides a method and device for interaction between the IMS domain and the PS domain when a one-card dual-number call is established for a dedicated bearer, so as to realize normal communication services when the user identifiers in the IMS domain and the PS domain are inconsistent. The method comprises: SBC / P‑CSCF generates an access authorization request message carrying an IMS domain user identifier; receives an access authorization request message generated by the SBC / P‑CSCF, and converts the IMS domain user identifier carried in the access authorization request message into a PS domain authorization authentication user identifier; PCF / PCRF receives an access authentication message carrying a PS domain authorization authentication user identifier, and requests the PS domain to establish a dedicated bearer. The present invention realizes the establishment of a dedicated bearer in a one-card dual-number service state by converting the IMS domain user identifier into a PS domain authorization authentication user identifier, thereby ensuring normal communication services in a one-card dual-number service form.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a method and device for interaction between an IMS domain and a PS domain when a one-card dual-number call is established for a dedicated bearer. Background Art

[0002] In the existing communication technology, IMS (IP Multimedia Subsystem) domain and PS (Packet Switch) domain are important components of modern communication networks. After the terminal UE (User Equipment) uses the IMS domain communication voice service process, the SBC / P-CSCF (Session Border Controller / Proxy-Call Session Control Function) needs to send an access authorization request message to the PCF / PCRF and request the PS domain to establish a dedicated bearer. After the dedicated bearer is established, the user can make high-quality IMS calls.

[0003] In normal services, one number is used for communication and authentication, and the IMS domain and PS domain are associated with the same MSISDN. When making a call in the IMS domain, the SBC / P-CSCF sends an access authorization request message carrying the MSISDN to the PCF / PCRF (Policy Control Function / Policy and Charging Rules Function) to request the establishment of a dedicated bearer. The PCF / PCRF receives the access authorization request message carrying the MSISDN, performs authorization and authentication based on the MSISDN in the access authorization request message, and requests the PS domain to establish a dedicated bearer. After the dedicated bearer is established, high-quality communication services in the IMS domain can be carried out.

[0004] There is a new communication service form now, which is called one card with two numbers. This one card with two numbers refers to a user ID (telephone number) in the IMS domain for the IMS domain voice communication service, marked as MSISDN1, and another user ID in the PS domain for PS domain authorization and authentication, marked as MSISDN2. The two IDs are bound to the same IMSI (International Mobile Subscriber Identification Number). When the terminal UE uses MSISDN1 to call and establish a dedicated bearer, the SBC / P-CSCF generates an access authorization request message, which contains the IMS domain user ID (i.e., IMS domain MSISDN) MSISDN1. The access authorization request message will be sent to the PCF / PCRF to request the establishment of a dedicated bearer. After receiving the access authorization request message, the PCF / PCRF will authorize and authenticate the user ID MSISDN1 in the message. Since there is no authorization and authentication information of MSISDN1 in the PS domain, the authentication and authorization cannot be completed, resulting in the inability to establish the dedicated bearer, and thus unable to communicate normally. Therefore, when establishing a dedicated bearer for a one-card dual-number call, the user identifier MSISDN in the IMS domain and the PS domain is inconsistent, resulting in authentication and authorization failure, the dedicated bearer cannot be established, and normal communication cannot be achieved. It is urgent to propose an effective method to achieve normal communication under the one-card dual-number service. Summary of the invention

[0005] The present invention aims to provide a solution for interaction between the IMS domain and the PS domain when a call is established for a dedicated bearer in a one-card dual-number service mode, so as to solve the deficiencies in the prior art. The technical problem to be solved by the present invention is achieved through the following technical solution.

[0006] To solve the above problems, the first aspect of the present invention provides a method for interaction between the IMS domain and the PS domain when a dedicated bearer is established for a one-card dual-number call, the method comprising: receiving an access authorization request message carrying an IMS domain user identifier generated by an SBC / P-CSCF; the IMS domain user identifier and the PS domain MSISDN are bound to the IMSI, and according to the mapping relationship between the IMS domain user identifier, the PS domain MSISDN and the IMSI, the IMS domain user identifier in the access authorization request message is converted into a PS domain authorization authentication identifier to obtain the access authorization request message carrying the PS domain authorization authentication identifier, wherein the PS domain authorization authentication identifier includes the PS domain MSISDN and the IMSI; the access authorization request message carrying the PS domain authorization authentication identifier is forwarded to the PCF / PCRF, and the PCF / PCRF performs authentication and authorization in the PS domain according to the PS domain authorization authentication identifier in the authorization request message to complete the establishment of the dedicated bearer.

[0007] Preferably, the method further comprises: the SBC / P-CSCF obtains SIP (Session Initiation Protocol) signaling sent by the UE, converts the SIP signaling into the access authorization request message, and the access authorization request message includes the IMS domain user identifier.

[0008] Preferably, the PCF / PCRF performs authentication and authorization in the PS domain according to the PS domain authorization authentication identifier in the authorization request message, and completes the establishment of the dedicated bearer, including: the PCF / PCRF obtains policy control information from a third-party network element in the PS domain according to the PS domain authorization authentication identifier, establishes a dedicated bearer in the PS domain according to the policy control information, and returns a response message to the SBC / P-CSCF.

[0009] Preferably, the conversion of the IMS domain user identifier in the access authorization request message into the PS domain authorization authentication identifier includes: converting the IMS domain user identifier into the IMSI according to the mapping relationship between the IMS domain user identifier and the IMSI; converting the IMS domain user identifier into the PS domain MSISDN according to the mapping relationship between the IMS domain user identifier and the PS domain MSISDN.

[0010] Preferably, converting the IMS domain user identifier into an IMSI, obtaining the access authorization request message carrying the IMSI, and forwarding the access authorization request message to the PCF / PCRF includes: the SBC / P-CSCF internally parses the access authorization request message generated by the SBC / P-CSCF to obtain the IMS domain user identifier, converts the IMS domain user identifier into the IMSI, obtains the access authorization request message carrying the IMSI, and forwards the access authorization request message to the PCF / PCRF; or the SBC / P-CSCF transmits the access authorization request message carrying the IMS domain user identifier to the DRA, and the DRA network element internally parses the access authorization request message carrying the IMS domain user identifier to obtain the IMS domain user identifier, converts the IMS domain user identifier into the IMSI, obtains the access authorization request message carrying the IMSI, and forwards the access authorization request message to the PCF / PCRF. The access authorization request message is sent to the PCF / PCRF; or the SBC / P-CSCF transmits the access authorization request message carrying the IMS domain user identifier to the BSF, and the BSF network element internally parses the access authorization request message carrying the IMS domain user identifier to obtain the IMS domain user identifier, and converts the IMS domain user identifier into the IMSI, obtains the access authorization request message carrying the IMSI, and forwards the access authorization request message to the PCF / PCRF; or the SBC / P-CSCF transmits the access authorization request message carrying the IMS domain user identifier to the PCF / PCRF, and the PCF / PCRF network element internally parses the access authorization request message carrying the IMS domain user identifier to obtain the IMS domain user identifier, and converts the IMS domain user identifier into the IMSI, and obtains the access authorization request message carrying the IMSI.

[0011] Preferably, converting the IMS domain user identifier into the PS domain MSISDN, obtaining the access authorization request message carrying the PS domain MSISDN and forwarding the access authorization request message to the PCF / PCRF includes: the SBC / P-CSCF side receives the access authorization request message carrying the IMS domain user identifier generated by the SBC / P-CSCF, parses the access authorization request message to obtain the IMS domain user identifier, converts the IMS domain user identifier into the PS domain MSISDN, obtains the access authorization request message carrying the PS domain MSISDN, and forwards the access authorization request message carrying the PS domain MSISDN to the PCF / PCRF. The access authorization request message is returned to the SBC / P-CSCF, and the SBC / P-CSCF forwards the access authorization request message to the PCF / PCRF; or the SBC / P-CSCF transmits the access authorization request message carrying the IMS domain user identifier to the DRA, and the DRA sends the access authorization request message to the DRA side. The DRA side receives the access authorization request message carrying the IMS domain user identifier, parses the access authorization request message to obtain the IMS domain user identifier, converts the IMS domain user identifier into the PS domain MSISDN, obtains the access authorization request message carrying the PS domain MSISDN, and returns it to the DRA. RA, the DRA forwards the access authorization request message to the PCF / PCRF; or the SBC / P-CSCF transmits the access authorization request message carrying the IMS domain user identifier to the BSF, and the BSF sends the access authorization request message to the BSF side. The BSF side receives the access authorization request message carrying the IMS domain user identifier, parses the access authorization request message to obtain the IMS domain user identifier, converts the IMS domain user identifier into the PS domain MSISDN, obtains the access authorization request message carrying the PS domain MSISDN, and returns it to the BSF. The BSF sends the access authorization request message forwarding to the PCF / PCRF; or the SBC / P-CSCF transmits the access authorization request message carrying the IMS domain user identifier to the PCF / PCRF, and the PCF / PCRF sends the access authorization request message to the PCF / PCRF side, and the PCF / PCRF side receives the access authorization request message carrying the IMS domain user identifier, parses the access authorization request message to obtain the IMS domain user identifier, converts the IMS domain user identifier into the PS domain MSISDN, obtains the access authorization request message carrying the PS domain MSISDN, and returns the access authorization request message to the PCF / PCRF;or the SBC / P-CSCF transmits the access authorization request message carrying the IMS domain user identifier between the SBC / P-CSCF and the PCF / PCRF, and after receiving the access authorization request message carrying the IMS domain user identifier, parses the access authorization request message to obtain the IMS domain user identifier, converts the IMS domain user identifier into the PS domain MSISDN, obtains the access authorization request message carrying the PS domain MSISDN, and then sends the access authorization request message to the PCF / PCRF. ;

[0012] Preferably, converting the IMS domain user identifier to the IMSI according to the mapping relationship between the IMS domain user identifier and the IMSI specifically includes: receiving the access authorization request message carrying the IMS domain user identifier generated by the SBC / P-CSCF; parsing the received access authorization request message carrying the IMS domain user identifier to obtain the IMS domain user identifier, converting the IMS domain user identifier to the IMSI according to the mapping relationship between the IMS domain user identifier and the IMSI, and obtaining the access authorization request message carrying the IMSI; forwarding the access authorization request message carrying the IMSI to a corresponding network element, and the corresponding network element forwarding the access authorization request message to the PCF / PCRF.

[0013] Preferably, converting the IMS domain user identifier into the PS domain MSISDN according to the mapping relationship between the IMS domain user identifier and the PS domain MSISDN includes: receiving the access authorization request message carrying the IMS domain user identifier generated by the SBC / P-CSCF; parsing the received access authorization request message carrying the IMS domain user identifier to obtain the IMS domain user identifier, converting the IMS domain user identifier into the PS domain MSISDN, and obtaining the access authorization request message carrying the PS domain MSISDN; forwarding the access authorization request message carrying the PS domain MSISDN to the corresponding network element, and the corresponding network element forwarding the access authorization request message to the PCF / PCRF.

[0014] According to another aspect of the present invention, the present invention also proposes a device for interaction between the IMS domain and the PS domain when a one-card dual-number call is established for a dedicated bearer, the device comprising: a receiving module, for receiving an access authorization request message carrying an IMS domain user identifier generated by an SBC / P-CSCF; a conversion module, wherein the IMS domain user identifier and the PS domain MSISDN are bound to the IMSI, and is used to convert the IMS domain user identifier in the access authorization request message into a PS domain authorization authentication identifier according to a mapping relationship between the IMS domain user identifier, the PS domain MSISDN and the IMSI, to obtain the access authorization request message carrying the PS domain authorization authentication identifier, wherein the PS domain authorization authentication identifier includes the PS domain MSISDN and the IMSI; a forwarding module, for forwarding the access authorization request message carrying the PS domain authorization authentication identifier to a PCF / PCRF, the PCF / PCRF performs authentication and authorization in the PS domain according to the PS domain authorization authentication identifier in the authorization request message, and completes the establishment of the dedicated bearer.

[0015] Preferably, converting the IMS domain user identifier in the access authorization request message into a PS domain authorization authentication identifier includes: converting the IMS domain user identifier into the IMSI according to a mapping relationship between the IMS domain user identifier and the IMSI; converting the IMS domain user identifier into the PS domain MSISDN according to a mapping relationship between the IMS domain user identifier and the PS domain MSISDN.

[0016] The embodiments of the present invention include the following advantages:

[0017] The present invention provides a method and device for interaction between the IMS domain and the PS domain when establishing a dedicated bearer for a one-card dual-number call, which solves the problem that the dedicated bearer cannot be established due to inconsistent user identifiers between the IMS domain and the PS domain under the one-card dual-number service form, affecting normal communication. It is not only applicable to 4G and 5G mobile communication networks, but also has good compatibility with the future mobile communication technology 6G. In addition, the invention provides a variety of embodiments, which operators and service providers can implement according to different communication network architectures to meet different business needs. The invention can be implemented not only on the Rx interface, but also on the N5 interface, and can meet the subsequent implementation on the new communication standard interface. The present invention will not affect the communication under normal business. For users who do not use the one-card dual-number service, the mapping relationship cannot be found, and the user identifier in the access authorization request message will not be changed. The IMS domain user identifier is still used to establish a dedicated bearer in the PS domain, which has good business compatibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a call communication flow chart of the IMS domain in the prior art;

[0019] Figure 2 It is a flowchart of the steps of an embodiment of a method for interaction between an IMS domain and a PS domain when establishing a dedicated bearer for a one-card dual-number call of the present invention;

[0020] Figure 3 It is a flowchart of the steps of converting an IMS domain user identity into an IMSI embodiment in a method for interaction between an IMS domain and a PS domain when establishing a dedicated bearer for a one-card dual-number call of the present invention;

[0021] Figure 4 It is a flowchart of the steps of converting an IMS domain user identity into a PS domain MSISDN in a method for interaction between the IMS domain and the PS domain when establishing a dedicated bearer for a one-card dual-number call of the present invention;

[0022] Figure 5 It is a flow chart of the interaction between the IMS domain and the PS domain based on IMSI association in the SBC / P-CSCF in the method for the interaction between the IMS domain and the PS domain when establishing a dedicated bearer for a one-card dual-number call of the present invention;

[0023] Figure 6 It is a flow chart of the interaction between the IMS domain and the PS domain based on IMSI association in DRA in a method for the interaction between the IMS domain and the PS domain when establishing a dedicated bearer for a one-card dual-number call of the present invention;

[0024] Figure 7 It is a flow chart of the interaction between the IMS domain and the PS domain based on IMSI association in the BSF in a method for the interaction between the IMS domain and the PS domain when establishing a dedicated bearer for a one-card dual-number call of the present invention;

[0025] Figure 8 It is a flow chart of the interaction between the IMS domain and the PS domain based on IMSI association in the PCF / PCRF in the method for the interaction between the IMS domain and the PS domain when establishing a dedicated bearer for a one-card dual-number call of the present invention;

[0026] Fig. 9 It is a flowchart of the interaction between the IMS domain and the PS domain based on the PS domain MSISDN association on the SBC / P-CSCF side in a method for the interaction between the IMS domain and the PS domain when establishing a dedicated bearer for a one-card dual-number call of the present invention;

[0027] Fig.10 It is a flowchart of the interaction between the IMS domain and the PS domain in the method for the interaction between the IMS domain and the PS domain when establishing a dedicated bearer for a one-card dual-number call of the present invention, in which the DRA side associates the IMS domain with the PS domain based on the PS domain MSISDN;

[0028] Fig.11 It is a flowchart of the interaction between the IMS domain and the PS domain based on the PS domain MSISDN association on the BSF side in a method for the interaction between the IMS domain and the PS domain when establishing a dedicated bearer for a one-card dual-number call of the present invention;

[0029] Fig.12 It is a flowchart of the interaction between the IMS domain and the PS domain based on the PS domain MSISDN association on the PCF / PCRF side in a method for the interaction between the IMS domain and the PS domain when establishing a dedicated bearer for a one-card dual-number call of the present invention;

[0030] Fig.13 It is a flow chart of the interaction between the IMS domain and the PS domain in the method of the present invention for the interaction between the IMS domain and the PS domain when establishing a dedicated bearer for a one-card dual-number call, based on the PS domain MSISDN association interface (Rx, N5) between the SBC / P-CSCF and the PCF / PCRF;

[0031] Fig.14 The present invention is a schematic diagram of a structure of an embodiment of a device for interaction between an IMS domain and a PS domain when establishing a dedicated bearer for a one-card dual-number call. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] It should be noted that the above detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present application belongs.

[0034] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0035] In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or inherent to these processes, methods, products, or apparatuses.

[0036] Figure 1 It is a call communication flow chart of the IMS domain in the prior art. Figure 1As shown, the terminal UEA sends a SIP INVITE request to the terminal UEB. After receiving the INVITE request, the calling party SBC / P-CSCF interacts with the PCF / PCRF network element to request the establishment of a dedicated bearer. After the dedicated bearer is completed, the INVITE message is sent to UEB. UEB responds with a 100 Trying message to UEA. UEB sends a 183 SDP message to UEA. The called party's SBC / P-CSCF receives the 183 SDP message and interacts with the called party's PCF / PCRF network element to request the establishment of a dedicated bearer. After the dedicated bearer is completed, the 183 SDP message is sent to UEA. UEA receives the 183 SDP message and sends a PRACK message response to UEB. UEB sends a 200 OK message back to UEA. UEA sends an Update message to UEB. The calling party SBC / P-CSCF receives the message sent by UEA and requests the PCF / PCRF network element to update the dedicated bearer. After the dedicated bearer is updated, the Update message is sent to UEB. UEB receives the Update message and sends a 200 OK response message to UEA. The message reaches the SBC / P-CSCF on the called side. The SBC / P-CSCF updates the dedicated bearer to the corresponding PCF / PCRF network element. After the update is completed, the SBC / P-CSCF of the called party sends a 200 OK message to UEA. UEB generates a ringing message and sends a 180 Ring message to UEA. UEB sends a 200 OK of the INVITE message to UEA. UEA receives the message and sends an ACK message to UEB. UEB receives the ACK message sent by UEA. At this time, both parties can conduct normal voice call services.

[0037] In the communication service, the IMS domain needs to interact with the PS domain and request to establish a dedicated bearer. In the service form of one card and two numbers, the terminal has the user identifier MSISDN1 in the IMS domain, which is used for voice communication services, and MSISDN2 in the PS domain, which is used to complete authentication and authorization in the PS domain. The two identifiers are bound to the same IMSI. When the user uses the user identifier MSISDN1 in the IMS domain to make a call to establish a dedicated bearer, the SBC / P-CSCF generates an access authorization request message carrying the MSISDN and it arrives at the PCF / PCRF. Since the PS domain stores the MSISDN2 information and does not have the corresponding MSISDN1 information, the relevant authorization and authentication cannot be completed, resulting in the inability to establish the dedicated bearer, affecting the normal communication service.

[0038] Aiming at the problem that the dedicated bearer cannot be established due to the inconsistency of the user identification MSISDN between the IMS domain and the PS domain when establishing a dedicated bearer under the current one-card dual-number service form, which affects the normal communication, the present invention proposes a method for the interaction between the IMS domain and the PS domain when establishing a dedicated bearer for a one-card dual-number call, so as to complete the establishment of the dedicated bearer under the one-card dual-number service form and realize the normal communication service.

[0039] Figure 2 This is a flowchart of a method embodiment of the present invention for interaction between the IMS domain and the PS domain when establishing a dedicated bearer for a one-card dual-number call. Figure 2 Describe the specific steps of interaction between the IMS domain and the PS domain when establishing a dedicated bearer for a one-card dual-number call.

[0040] Step S210: Receive an access authorization request message carrying an IMS domain user identifier generated by the SBC / P-CSCF.

[0041] Step S220, the IMS domain user identifier and the PS domain MSISDN are bound to the IMSI, and according to the mapping relationship between the IMS domain user identifier, the PS domain MSISDN and the IMSI, the IMS domain user identifier in the access authorization request message is converted into a PS domain authorization authentication identifier, and an access authorization request message carrying the PS domain authorization authentication identifier is obtained, wherein the PS domain authorization authentication identifier includes the PS domain MSISDN and IMSI.

[0042] Step S230: forward the access authorization request message carrying the PS domain authorization authentication identifier to the PCF / PCRF. The PCF / PCRF performs authentication and authorization in the PS domain according to the PS domain authorization authentication identifier in the authorization request message to complete the establishment of the dedicated bearer.

[0043] To achieve the interaction between the IMS domain and the PS domain when a call is established under the one-card dual-number service state, specifically, the SBC / P-CSCF obtains the SIP signaling sent by the UE and converts the SIP signaling into an access authorization request message, which contains the IMS domain user identifier. Step S210, receive the access authorization request message carrying the IMS domain user identifier generated by the SBC / P-CSCF. The SBC / P-CSCF does not change the call signaling SIP, and extracts the IMS domain user identifier from the public identifier IMPU of the IMS domain in the call signaling.

[0044] Step S220, the IMS domain user identity and the PS domain MSISDN are bound to the IMSI. According to the mapping relationship between the IMS domain user identity, the PS domain MSISDN and the IMSI, the IMS domain user identity in the access authorization request message is converted into the PS domain authorization authentication identity, and the access authorization request message carrying the PS domain authorization authentication identity is obtained, wherein the PS domain authorization authentication identity includes the PS domain MSISDN and the IMSI. Among them, IMSI is a unique identification number assigned to a mobile user by a communication system. The user identifies the user identity through the IMSI in the mobile communication network, which can greatly protect the user's communication security. The mapping relationship between the PS domain authorization authentication identity and the IMS domain user identity will be updated in time, so the IMS domain user identity can always find the latest mapped PS domain authorization authentication identity in the PS domain without affecting other related services of the user on the IMS domain user identity.

[0045] Specifically, converting the IMS domain user identity into the PS domain authorization authentication identity according to the mapping relationship between the IMS domain user identity of the IMS domain and the PS domain authorization authentication identity on the PS domain, and sending the PS domain authorization authentication identity to the PCF / PCRF includes two aspects: the first aspect is converting the IMS domain user identity into the IMSI according to the mapping relationship between the IMS domain user identity and the IMSI. The second aspect is converting the IMS domain user identity into the PS domain MSISDN according to the mapping relationship between the IMS domain user identity and the PS domain MSISDN.

[0046] According to the first aspect, further, Figure 3 This is a flowchart of the steps of converting an IMS domain user identity into an IMSI embodiment in a method for interaction between the IMS domain and the PS domain when establishing a dedicated bearer for a one-card dual-number call of the present invention. Figure 3 The specific steps of converting the IMS domain user ID into the IMSI are described according to the mapping relationship between the IMS domain user ID and the IMSI.

[0047] Step S310: Receive an access authorization request message carrying an IMS domain user identifier generated by the SBC / P-CSCF.

[0048] Step S320: parse the received access authorization request message carrying the IMS domain user identity to obtain the IMS domain user identity, convert the IMS domain user identity into the IMSI according to the mapping relationship between the IMS domain user identity and the IMSI, and obtain the access authorization request message carrying the IMSI.

[0049] Step S330: forward the access authorization request message carrying the IMSI to the corresponding network element, and the corresponding network element forwards the access authorization request message to the PCF / PCRF.

[0050] There are four ways to convert the IMS domain user identity into the IMSI according to the mapping relationship between the IMS domain user identity and the IMSI, and send the access authorization request message carrying the IMSI to the PCF / PCRF, which are described in the following in the form of four embodiments.

[0051] Embodiment 1: Implement the conversion between IMS domain user identity and IMSI within SBC / P-CSCF. The SBC / P-CSCF internally parses the access authorization request message generated by the SBC / P-CSCF to obtain the IMS domain user identity, and converts the IMS domain user identity into IMSI, obtains the access authorization request message carrying the IMSI, and forwards the access authorization request message to the PCF / PCRF.

[0052] Embodiment 2: Implement the conversion between IMS domain user identity and IMSI within DRA. SBC / P-CSCF transmits the access authorization request message carrying the IMS domain user identity to DRA. The DRA network element parses the access authorization request message carrying the IMS domain user identity to obtain the IMS domain user identity, and converts the IMS domain user identity into IMSI to obtain the access authorization request message carrying the IMSI, and forwards the access authorization request message to PCF / PCRF.

[0053] Embodiment 3: Implementing the conversion between IMS domain user identity and IMSI within BSF. BSF is added to the 5G communication network, and session binding is performed through BSF. SBC / P-CSCF transmits the access authorization request message carrying the IMS domain user identity to BSF. The BSF network element parses the access authorization request message carrying the IMS domain user identity to obtain the IMS domain user identity, and converts the IMS domain user identity to IMSI, obtains the access authorization request message carrying the IMSI, and forwards the access authorization request message to PCF / PCRF.

[0054] Embodiment 4: Conversion between IMS domain user identity and IMSI is implemented within PCF / PCRF. SBC / P-CSCF transmits the access authorization request message carrying the IMS domain user identity to PCF / PCRF, and the PCF / PCRF network element internally parses the access authorization request message carrying the IMS domain user identity to obtain the IMS domain user identity, and converts the IMS domain user identity into IMSI to obtain the access authorization request message carrying the IMSI.

[0055] According to the second aspect, further, Figure 4The present invention is a flowchart of the steps of converting an IMS domain user identity into a PS domain MSISDN in a method for interaction between the IMS domain and the PS domain when establishing a dedicated bearer for a one-card dual-number call. The following describes the specific steps of converting an IMS domain user identity into a PS domain MSISDN according to the mapping relationship between the IMS domain user identity and the PS domain MSISDN.

[0056] Step S410: Receive an access authorization request message carrying an IMS domain user identifier generated by the SBC / P-CSCF.

[0057] Step S420: Parse the received access authorization request message carrying the IMS domain user identifier to obtain the IMS domain user identifier, convert the IMS domain user identifier into a PS domain MSISDN, and obtain an access authorization request message carrying the PS domain MSISDN.

[0058] Step S430: forward the access authorization request message carrying the PS domain MSISDN to the corresponding network element, and the corresponding network element forwards the access authorization request message to the PCF / PCRF.

[0059] Specifically, there are five ways to find out the PS domain MSISDN according to the mapping relationship between the IMS domain user identity and the PS domain MSISDN, and send the access authorization request message carrying the PS domain MSISDN to the PCF / PCRF, which are described below in five embodiments.

[0060] Embodiment 5: Implementing the conversion between the IMS domain user identity and the PS domain MSISDN on the SBC / P-CSCF side. The SBC / P-CSCF side receives the access authorization request message carrying the IMS domain user identity generated by the SBC / P-CSCF, parses the access authorization request message to obtain the IMS domain user identity, converts the IMS domain user identity into the PS domain MSISDN, obtains the access authorization request message carrying the PS domain MSISDN, and returns the access authorization request message carrying the PS domain MSISDN to the SBC / P-CSCF, and the SBC / P-CSCF forwards the access authorization request message to the PCF / PCRF.

[0061] Embodiment 6: Implement the conversion between the IMS domain user identity and the PS domain MSISDN on the DRA side. The SBC / P-CSCF transmits the access authorization request message carrying the IMS domain user identity to the DRA, and the DRA sends the access authorization request message to the DRA side. The DRA side receives the access authorization request message carrying the IMS domain user identity, parses the access authorization request message to obtain the IMS domain user identity, converts the IMS domain user identity to the PS domain MSISDN, obtains the access authorization request message carrying the PS domain MSISDN, and returns it to the DRA. The DRA forwards the access authorization request message to the PCF / PCRF.

[0062] Example 7: The conversion between the IMS domain user identifier and the PS domain MSISDN is implemented on the BSF side. The SBC / P-CSCF transmits the access authorization request message carrying the IMS domain user identifier to the BSF, and the BSF sends the access authorization request message to the BSF side. The BSF side receives the access authorization request message carrying the IMS domain user identifier, parses the access authorization request message to obtain the IMS domain user identifier, converts the IMS domain user identifier into the PS domain MSISDN, obtains the access authorization request message carrying the PS domain MSISDN, and returns it to the BSF. The BSF forwards the access authorization request message to the PCF / PCRF.

[0063] Embodiment 8: Implementing the conversion between the IMS domain user identity and the PS domain MSISDN on the PCF / PCRF side. The SBC / P-CSCF transmits the access authorization request message carrying the IMS domain user identity to the PCF / PCRF, which sends the access authorization request message to the PCF / PCRF side. The PCF / PCRF side receives the access authorization request message carrying the IMS domain user identity, parses the access authorization request message to obtain the IMS domain user identity, converts the IMS domain user identity to the PS domain MSISDN, obtains the access authorization request message carrying the PS domain MSISDN, and returns the access authorization request message to the PCF / PCRF.

[0064] Embodiment 9: Implementing the conversion between the IMS domain user identity and the PS domain MSISDN between the SBC / P-CSCF and the PCF / PCRF. The SBC / P-CSCF transmits the access authorization request message carrying the IMS domain user identity between the SBC / P-CSCF and the PCF / PCRF, and after receiving the access authorization request message carrying the IMS domain user identity, parses the access authorization request message to obtain the IMS domain user identity, converts the IMS domain user identity to the PS domain MSISDN, obtains the access authorization request message carrying the PS domain MSISDN, and then sends the access authorization request message to the PCF / PCRF.

[0065] Step S230: forward the access authorization request message carrying the PS domain authorization authentication identifier to the PCF / PCRF, and the PCF / PCRF performs authentication and authorization in the PS domain according to the PS domain authorization authentication identifier in the authorization request message, and completes the establishment of the dedicated bearer. Specifically, the PCF / PCRF obtains policy control information from the third-party network element in the PS domain according to the PS domain authorization authentication identifier, establishes a dedicated bearer in the PS domain according to the policy control information, and returns a response message to the SBC / P-CSCF.

[0066] When establishing a dedicated bearer for a one-card dual-number call, the interaction between the IMS domain and the PS domain is achieved through two solutions. First, the interaction between the IMS domain and the PS domain is achieved based on IMSI; second, the interaction between the IMS domain and the PS domain is achieved based on the PS domain MSISDN.

[0067] According to the first aspect, the IMS domain user identity and the PS domain MSISDN are bound to the same IMSI, so a dedicated bearer can be established in the PS domain through the IMSI. The present invention provides four embodiments to illustrate the interaction between the IMS domain and the PS domain based on the IMSI.

[0068] Embodiment 12: Figure 5 The present invention is a flow chart of the interaction between the IMS domain and the PS domain in the SBC / P-CSCF based on the IMSI association in the method of the IMS domain and the PS domain interacting when establishing a dedicated bearer for a one-card dual-number call. Figure 5 As shown, the SBC / P-CSCF obtains the SIP signaling sent by the UE, and converts the SIP signaling into an access authorization request message, and the access authorization request message includes the IMS domain user identifier. The number conversion device receives the access authorization request message generated by the SBC / P-CSCF and carrying the IMS domain user identifier. The IMS domain user identifier and the PS domain MSISDN are bound to the IMSI. According to the mapping relationship between the IMS domain user identifier, the PS domain MSISDN and the IMSI, the SBC / P-CSCF internally parses the access authorization request message generated by the SBC / P-CSCF to obtain the IMS domain user identifier, and converts the IMS domain user identifier to the IMSI, obtains the access authorization request message carrying the IMSI, and forwards the access authorization request message to the PCF / PCRF. The PCF / PCRF obtains the policy control information from the third-party network element in the PS domain according to the PS domain authorization authentication identifier, establishes a dedicated bearer in the PS domain according to the policy control information, and returns a response message to the SBC / P-CSCF.

[0069] Embodiment 13: Figure 6 The present invention is a flowchart of the interaction between the IMS domain and the PS domain in the DRA based on the IMSI association in the method of the IMS domain and the PS domain interacting when establishing a dedicated bearer for a one-card dual-number call. Figure 6 As shown, the SBC / P-CSCF obtains the SIP signaling sent by the UE, and converts the SIP signaling into an access authorization request message, and the access authorization request message includes the IMS domain user identifier. The number conversion device receives the access authorization request message carrying the IMS domain user identifier generated by the SBC / P-CSCF. The IMS domain user identifier and the PS domain MSISDN are bound to the IMSI. According to the mapping relationship between the IMS domain user identifier, the PS domain MSISDN and the IMSI, the SBC / P-CSCF transmits the access authorization request message carrying the IMS domain user identifier to the DRA, and the DRA network element internally parses the access authorization request message carrying the IMS domain user identifier to obtain the IMS domain user identifier, and converts the IMS domain user identifier into the IMSI, obtains the access authorization request message carrying the IMSI, and forwards the access authorization request message to the PCF / PCRF. The PCF / PCRF obtains the policy control information from the third-party network element in the PS domain according to the PS domain authorization authentication identifier, establishes a dedicated bearer in the PS domain according to the policy control information, and returns a response message to the SBC / P-CSCF.

[0070] Embodiment 14: Figure 7 The present invention is a flowchart of the interaction between the IMS domain and the PS domain in the BSF based on the IMSI association in the method of the IMS domain and the PS domain interaction when establishing a dedicated bearer for a one-card dual-number call. Figure 7 As shown, the SBC / P-CSCF obtains the SIP signaling sent by the UE and converts the SIP signaling into an access authorization request message, which contains the IMS domain user identifier. The number conversion device receives the access authorization request message generated by the SBC / P-CSCF and carrying the IMS domain user identifier. The IMS domain user identifier and the PS domain MSISDN are bound to the IMSI. According to the mapping relationship between the IMS domain user identifier, the PS domain MSISDN and the IMSI, the SBC / P-CSCF transmits the access authorization request message carrying the IMS domain user identifier to the BSF. The BSF network element internally parses the access authorization request message carrying the IMS domain user identifier to obtain the IMS domain user identifier, and converts the IMS domain user identifier into the IMSI, obtains the access authorization request message carrying the IMSI, and forwards the access authorization request message to the PCF / PCRF. The PCF / PCRF obtains the policy control information from the third-party network element in the PS domain according to the PS domain authorization authentication identifier, establishes a dedicated bearer in the PS domain according to the policy control information, and returns a response message to the SBC / P-CSCF.

[0071] Embodiment 15: Figure 8 The present invention is a flowchart of the interaction between the IMS domain and the PS domain in the PCF / PCRF based on the IMSI association in the method of the IMS domain and the PS domain interaction when establishing a dedicated bearer for a one-card dual-number call. Figure 8As shown, the SBC / P-CSCF obtains the SIP signaling sent by the UE, and converts the SIP signaling into an access authorization request message, and the access authorization request message includes the IMS domain user identifier. The number conversion device receives the access authorization request message carrying the IMS domain user identifier generated by the SBC / P-CSCF. The IMS domain user identifier and the PS domain MSISDN are bound to the IMSI. According to the mapping relationship between the IMS domain user identifier, the PS domain MSISDN and the IMSI, the SBC / P-CSCF transmits the access authorization request message carrying the IMS domain user identifier to the PCF / PCRF, and the PCF / PCRF network element internally parses the access authorization request message carrying the IMS domain user identifier to obtain the IMS domain user identifier, and converts the IMS domain user identifier into the IMSI, and obtains the access authorization request message carrying the IMSI. The PCF / PCRF obtains the policy control information from the third-party network element in the PS domain according to the PS domain authorization authentication identifier, establishes a dedicated bearer in the PS domain according to the policy control information, and returns a response message to the SBC / P-CSCF.

[0072] According to the second aspect, the IMS domain user identity and the PS domain MSISDN are bound to the same IMSI, and a dedicated bearer can be established in the PS domain using the PS domain MSISDN. The present invention provides five embodiments to illustrate the interaction between the IMS domain and the PS domain based on the PS domain MSISDN.

[0073] Embodiment 16: Fig. 9 The present invention is a flowchart of the interaction between the IMS domain and the PS domain in the method of establishing a dedicated bearer for a one-card dual-number call, in which the SBC / P-CSCF side associates the IMS domain with the PS domain based on the PS domain MSISDN. The SBC / P-CSCF is connected to the number conversion device, and the number conversion device searches for the PS domain MSISDN based on the mapping relationship between the IMS domain user identifier and the PS domain MSISDN. Fig. 9As shown, the SBC / P-CSCF obtains the SIP signaling sent by the UE, and converts the SIP signaling into an access authorization request message, and the access authorization request message includes the IMS domain user identifier. The number conversion device receives the access authorization request message carrying the IMS domain user identifier generated by the SBC / P-CSCF. The IMS domain user identifier and the PS domain MSISDN are bound to the IMSI. According to the mapping relationship between the IMS domain user identifier, the PS domain MSISDN and the IMSI, the SBC / P-CSCF side receives the access authorization request message carrying the IMS domain user identifier generated by the SBC / P-CSCF, parses the access authorization request message to obtain the IMS domain user identifier, converts the IMS domain user identifier into the PS domain MSISDN, obtains the access authorization request message carrying the PS domain MSISDN, and returns the access authorization request message carrying the PS domain MSISDN to the SBC / P-CSCF, and the SBC / P-CSCF forwards the access authorization request message to the PCF / PCRF. The PCF / PCRF obtains policy control information from the third-party network element in the PS domain according to the PS domain authorization authentication identifier, establishes a dedicated bearer in the PS domain according to the policy control information, and returns a response message to the SBC / P-CSCF.

[0074] Embodiment 17: Fig.10 This is a flowchart of the interaction between the IMS domain and the PS domain in the method of the present invention for establishing a dedicated bearer for a one-card dual-number call. The DRA is connected to a number conversion device, and the DRA sends the IMS domain user identity to the number conversion device and receives the converted PS domain MSISDN. Fig.10As shown, the SBC / P-CSCF obtains the SIP signaling sent by the UE and converts the SIP signaling into an access authorization request message, and the access authorization request message includes the IMS domain user identity. The number conversion device receives the access authorization request message carrying the IMS domain user identity generated by the SBC / P-CSCF. The IMS domain user identity and the PS domain MSISDN are bound to the IMSI. According to the mapping relationship between the IMS domain user identity, the PS domain MSISDN and the IMSI, the SBC / P-CSCF transmits the access authorization request message carrying the IMS domain user identity to the DRA, and the DRA sends the access authorization request message to the DRA side. The DRA side receives the access authorization request message carrying the IMS domain user identity, parses the access authorization request message to obtain the IMS domain user identity, converts the IMS domain user identity into the PS domain MSISDN, obtains the access authorization request message carrying the PS domain MSISDN, and returns it to the DRA. The DRA forwards the access authorization request message to the PCF / PCRF. The PCF / PCRF obtains policy control information from the third-party network element in the PS domain according to the PS domain authorization authentication identifier, establishes a dedicated bearer in the PS domain according to the policy control information, and returns a response message to the SBC / P-CSCF.

[0075] Embodiment 18: Fig.11 The present invention is a flowchart of the method for the interaction between the IMS domain and the PS domain when a one-card dual-number call is established for a dedicated bearer. The BSF is connected to a number conversion device, and the BSF sends the IMS domain user identity to the number conversion device and receives the converted PS domain MSISDN. Fig.11As shown, the SBC / P-CSCF obtains the SIP signaling sent by the UE and converts the SIP signaling into an access authorization request message, and the access authorization request message includes the IMS domain user identity. The number conversion device receives the access authorization request message carrying the IMS domain user identity generated by the SBC / P-CSCF. The IMS domain user identity and the PS domain MSISDN are bound to the IMSI. According to the mapping relationship between the IMS domain user identity, the PS domain MSISDN and the IMSI, the SBC / P-CSCF transmits the access authorization request message carrying the IMS domain user identity to the BSF, and the BSF sends the access authorization request message to the BSF side. The BSF side receives the access authorization request message carrying the IMS domain user identity, parses the access authorization request message to obtain the IMS domain user identity, converts the IMS domain user identity into the PS domain MSISDN, obtains the access authorization request message carrying the PS domain MSISDN, and returns it to the BSF. The BSF forwards the access authorization request message to the PCF / PCRF. The PCF / PCRF obtains policy control information from the third-party network element in the PS domain according to the PS domain authorization authentication identifier, establishes a dedicated bearer in the PS domain according to the policy control information, and returns a response message to the SBC / P-CSCF.

[0076] Embodiment 19: Fig.12 This is a flowchart of the interaction between the IMS domain and the PS domain in the method of the present invention for establishing a dedicated bearer for a one-card dual-number call. The PCF / PCRF is connected to a number conversion device, and the PCF / PCRF sends the IMS domain user identity to the number conversion device and receives the converted PS domain MSISDN. Fig.12As shown, the SBC / P-CSCF obtains the SIP signaling sent by the UE, and converts the SIP signaling into an access authorization request message, and the access authorization request message includes the IMS domain user identity. The number conversion device receives the access authorization request message carrying the IMS domain user identity generated by the SBC / P-CSCF. The IMS domain user identity and the PS domain MSISDN are bound to the IMSI. According to the mapping relationship between the IMS domain user identity, the PS domain MSISDN and the IMSI, the SBC / P-CSCF transmits the access authorization request message carrying the IMS domain user identity to the PCF / PCRF, and the PCF / PCRF sends the access authorization request message to the PCF / PCRF side. The PCF / PCRF side receives the access authorization request message carrying the IMS domain user identity, parses the access authorization request message to obtain the IMS domain user identity, converts the IMS domain user identity into the PS domain MSISDN, obtains the access authorization request message carrying the PS domain MSISDN, and returns the access authorization request message to the PCF / PCRF. The PCF / PCRF obtains policy control information from the third-party network element in the PS domain according to the PS domain authorization authentication identifier, establishes a dedicated bearer in the PS domain according to the policy control information, and returns a response message to the SBC / P-CSCF.

[0077] Embodiment 20: Fig.13 This is a flowchart of the interaction between the IMS domain and the PS domain in the method of the present invention for establishing a dedicated bearer for a one-card dual-number call, based on the PS domain MSISDN association interface (Rx, N5, etc.) between the SBC / P-CSCF and the PCF / PCRF. Fig.13 As shown, the SBC / P-CSCF obtains the SIP signaling sent by the UE and converts the SIP signaling into an access authorization request message, and the access authorization request message includes the IMS domain user identifier. The number conversion device receives the access authorization request message carrying the IMS domain user identifier generated by the SBC / P-CSCF. The IMS domain user identifier and the PS domain MSISDN are bound to the IMSI. According to the mapping relationship between the IMS domain user identifier, the PS domain MSISDN and the IMSI, the SBC / P-CSCF transmits the access authorization request message carrying the IMS domain user identifier between the SBC / P-CSCF and the PCF / PCRF. After receiving the access authorization request message carrying the IMS domain user identifier, the access authorization request message is parsed to obtain the IMS domain user identifier, the IMS domain user identifier is converted into the PS domain MSISDN, and the access authorization request message carrying the PS domain MSISDN is obtained, and then the access authorization request message is sent to the PCF / PCRF. The PCF / PCRF obtains policy control information from the third-party network element in the PS domain according to the PS domain authorization authentication identifier, establishes a dedicated bearer in the PS domain according to the policy control information, and returns a response message to the SBC / P-CSCF.

[0078] The workflow embodiment of the interaction between the IMS domain and the PS domain when establishing a dedicated bearer for a one-card dual-number call provided by the present invention is the same as the steps in the method embodiment of the interaction between the IMS domain and the PS domain when establishing a dedicated bearer for a one-card dual-number call provided by the present invention, and their repeated description is omitted here.

[0079] FIG. 1 is a schematic diagram of a structure of an embodiment of a device for interaction between an IMS domain and a PS domain when establishing a dedicated bearer for a one-card dual-number call according to the present invention. Fig.14 As shown, the device for interaction between the IMS domain and the PS domain when establishing a dedicated bearer for a one-card dual-number call includes: a receiving module 10, a conversion module 20 and a forwarding module 30. Among them, the receiving module 10 is used to receive an access authorization request message carrying an IMS domain user identifier generated by the SBC / P-CSCF. The conversion module 20 binds the IMS domain user identifier and the PS domain MSISDN to the IMSI, and is used to convert the IMS domain user identifier in the access authorization request message into a PS domain authorization authentication identifier according to the mapping relationship between the IMS domain user identifier, the PS domain MSISDN and the IMSI, and obtain an access authorization request message carrying the PS domain authorization authentication identifier, wherein the PS domain authorization authentication identifier includes the PS domain MSISDN and the IMSI. Specifically, converting the IMS domain user identifier in the access authorization request message into the PS domain authorization authentication identifier includes: converting the IMS domain user identifier into the IMSI according to the mapping relationship between the IMS domain user identifier and the IMSI; converting the IMS domain user identifier into the PS domain MSISDN according to the mapping relationship between the IMS domain user identifier and the PS domain MSISDN. The forwarding module 30 is used to forward the access authorization request message carrying the PS domain authorization authentication identifier to the PCF / PCRF. The PCF / PCRF performs authentication and authorization in the PS domain according to the PS domain authorization authentication identifier in the authorization request message to complete the establishment of the dedicated bearer.

[0080] The device structure embodiment for interaction between the IMS domain and the PS domain when a one-card dual-number call is established for a dedicated bearer provided by the present invention is the same as the steps in the method embodiment for interaction between the IMS domain and the PS domain when a one-card dual-number call is established for a dedicated bearer provided by the present invention or the workflow embodiment for interaction between the IMS domain and the PS domain when a one-card dual-number call is established for a dedicated bearer provided by the present invention, and a repeated description thereof is omitted herein.

[0081] The present invention relates to a method and device for interaction between an IMS domain and a PS domain when a dedicated bearer is established by a one-card dual-number call. In view of the problem that the user identifiers of the IMS domain and the PS domain are inconsistent under the service form of one-card dual-number in the current prior art, resulting in the inability to establish a dedicated bearer, affecting normal communication, a method for converting an IMS domain user identifier into a PS domain authorization authentication identifier is proposed, so that the IMS domain and the PS domain interact when establishing a dedicated bearer. The present invention also proposes methods for establishing a dedicated bearer in 4G and 5G technologies respectively according to the progress of mobile communication technology. The method has high compatibility in 4G network and 5G network mobile communication technologies, and provides a guiding direction for the mobile communication technology proposed subsequently.

[0082] In the above detailed description, reference is made to the accompanying drawings, which form a part of this document. In the accompanying drawings, similar symbols typically identify similar components unless the context indicates otherwise. The illustrated embodiments described in the detailed description, drawings, and claims are not meant to be limiting. Other embodiments may be used, and other changes may be made, without departing from the spirit or scope of the subject matter presented herein.

[0083] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for interaction between the IMS domain and the PS domain when establishing a dedicated bearer for a one-card dual-number call, characterized in that: The method comprises: Receive an access authorization request message carrying an IMS domain user identity generated by the SBC / P-CSCF; The IMS domain user identifier and the PS domain MSISDN are bound to the IMSI, and according to the mapping relationship between the IMS domain user identifier, the PS domain MSISDN and the IMSI, the IMS domain user identifier in the access authorization request message is converted into a PS domain authorization authentication identifier, including: according to the mapping relationship between the IMS domain user identifier and the IMSI, the IMS domain user identifier is converted into the IMSI, specifically including: receiving the access authorization request message carrying the IMS domain user identifier generated by the SBC / P-CSCF; parsing the received access authorization request message carrying the IMS domain user identifier to obtain the IMS domain user identifier, converting the IMS domain user identifier into the IMSI according to the mapping relationship between the IMS domain user identifier and the IMSI, and obtaining the access authorization request message carrying the IMSI; forwarding the access authorization request message carrying the IMSI to the corresponding network element, and the corresponding network element converts the IMSI into the IMSI. The access authorization request message is forwarded to the PCF / PCRF; according to the mapping relationship between the IMS domain user identifier and the PS domain MSISDN, the IMS domain user identifier is converted into the PS domain MSISDN, specifically comprising: receiving the access authorization request message carrying the IMS domain user identifier generated by the SBC / P-CSCF; parsing the received access authorization request message carrying the IMS domain user identifier to obtain the IMS domain user identifier, converting the IMS domain user identifier into the PS domain MSISDN, and obtaining the access authorization request message carrying the PS domain MSISDN; forwarding the access authorization request message carrying the PS domain MSISDN to the corresponding network element, and the corresponding network element forwards the access authorization request message to the PCF / PCRF to obtain the access authorization request message carrying the PS domain authorization authentication identifier, wherein the PS domain authorization authentication identifier includes the PS domain MSISDN and the IMSI; The access authorization request message carrying the PS domain authorization authentication identifier is forwarded to the PCF / PCRF, and the PCF / PCRF performs authentication and authorization in the PS domain according to the PS domain authorization authentication identifier in the authorization request message to complete the establishment of the dedicated bearer.

2. The method according to claim 1, characterized in that The method further comprises: The SBC / P-CSCF obtains the SIP signaling sent by the UE, and converts the SIP signaling into the access authorization request message, where the access authorization request message includes the IMS domain user identifier.

3. The method according to claim 2, characterized in that The PCF / PCRF performs authentication and authorization in the PS domain according to the PS domain authorization authentication identifier in the authorization request message, and completes the establishment of the dedicated bearer, including: The PCF / PCRF obtains policy control information from a third-party network element in the PS domain according to the PS domain authorization authentication identifier, establishes a dedicated bearer in the PS domain according to the policy control information, and returns a response message to the SBC / P-CSCF.

4. The method according to claim 3, characterized in that Converting the IMS domain user identity into an IMSI, obtaining the access authorization request message carrying the IMSI, and forwarding the access authorization request message to the PCF / PCRF includes: The SBC / P-CSCF internally parses the access authorization request message generated by the SBC / P-CSCF to obtain the IMS domain user identity, converts the IMS domain user identity into the IMSI, obtains the access authorization request message carrying the IMSI, and forwards the access authorization request message to the PCF / PCRF; or the SBC / P-CSCF transmits the access authorization request message carrying the IMS domain user identifier to the DRA, and the DRA network element internally parses the access authorization request message carrying the IMS domain user identifier to obtain the IMS domain user identifier, converts the IMS domain user identifier into the IMSI, obtains the access authorization request message carrying the IMSI, and forwards the access authorization request message to the PCF / PCRF; or the SBC / P-CSCF transmits the access authorization request message carrying the IMS domain user identifier to the BSF, and the BSF network element internally parses the access authorization request message carrying the IMS domain user identifier to obtain the IMS domain user identifier, and converts the IMS domain user identifier into the IMSI, obtains the access authorization request message carrying the IMSI, and forwards the access authorization request message to the PCF / PCRF; Or the SBC / P-CSCF transmits the access authorization request message carrying the IMS domain user identifier to the PCF / PCRF, and the PCF / PCRF network element internally parses the access authorization request message carrying the IMS domain user identifier to obtain the IMS domain user identifier, and converts the IMS domain user identifier into the IMSI to obtain the access authorization request message carrying the IMSI.

5. The method according to claim 4, characterized in that Converting the IMS domain user identity into the PS domain MSISDN, obtaining the access authorization request message carrying the PS domain MSISDN, and forwarding the access authorization request message to the PCF / PCRF includes: The SBC / P-CSCF side receives the access authorization request message carrying the IMS domain user identifier generated by the SBC / P-CSCF, parses the access authorization request message to obtain the IMS domain user identifier, converts the IMS domain user identifier into the PS domain MSISDN, obtains the access authorization request message carrying the PS domain MSISDN, and returns the access authorization request message carrying the PS domain MSISDN to the SBC / P-CSCF, and the SBC / P-CSCF forwards the access authorization request message to the PCF / PCRF; or the SBC / P-CSCF transmits the access authorization request message carrying the IMS domain user identifier to the DRA, the DRA sends the access authorization request message to the DRA side, the DRA side receives the access authorization request message carrying the IMS domain user identifier, parses the access authorization request message to obtain the IMS domain user identifier, converts the IMS domain user identifier into the PS domain MSISDN, obtains the access authorization request message carrying the PS domain MSISDN, and returns it to the DRA, and the DRA forwards the access authorization request message to the PCF / PCRF; or the SBC / P-CSCF transmits the access authorization request message carrying the IMS domain user identifier to the BSF, the BSF sends the access authorization request message to the BSF side, the BSF side receives the access authorization request message carrying the IMS domain user identifier, parses the access authorization request message to obtain the IMS domain user identifier, converts the IMS domain user identifier into the PS domain MSISDN, obtains the access authorization request message carrying the PS domain MSISDN, and returns it to the BSF, and the BSF forwards the access authorization request message to the PCF / PCRF; or the SBC / P-CSCF transmits the access authorization request message carrying the IMS domain user identifier to the PCF / PCRF, and the PCF / PCRF sends the access authorization request message to the PCF / PCRF side, and the PCF / PCRF side receives the access authorization request message carrying the IMS domain user identifier, parses the access authorization request message to obtain the IMS domain user identifier, converts the IMS domain user identifier into the PS domain MSISDN, obtains the access authorization request message carrying the PS domain MSISDN, and returns the access authorization request message to the PCF / PCRF; Or the SBC / P-CSCF transmits the access authorization request message carrying the IMS domain user identifier between the SBC / P-CSCF and the PCF / PCRF, and after receiving the access authorization request message carrying the IMS domain user identifier, parses the access authorization request message to obtain the IMS domain user identifier, converts the IMS domain user identifier into the PS domain MSISDN, obtains the access authorization request message carrying the PS domain MSISDN, and then sends the access authorization request message to the PCF / PCRF.

6. A device for interaction between the IMS domain and the PS domain when establishing a dedicated bearer for a one-card dual-number call, characterized in that: The device comprises: A receiving module, used for receiving an access authorization request message carrying an IMS domain user identifier generated by an SBC / P-CSCF; The conversion module, in which the IMS domain user identity and the PS domain MSISDN are bound to the IMSI, is used to convert the IMS domain user identity in the access authorization request message into a PS domain authorization authentication identity according to the mapping relationship between the IMS domain user identity, the PS domain MSISDN and the IMSI, including: converting the IMS domain user identity into the IMSI according to the mapping relationship between the IMS domain user identity and the IMSI, specifically including: receiving the access authorization request message carrying the IMS domain user identity generated by the SBC / P-CSCF; parsing the received access authorization request message carrying the IMS domain user identity to obtain the IMS domain user identity, converting the IMS domain user identity into the IMSI according to the mapping relationship between the IMS domain user identity and the IMSI, and obtaining the access authorization request message carrying the IMSI; forwarding the access authorization request message carrying the IMSI to the corresponding network element, and the corresponding network element Forwarding the access authorization request message to the PCF / PCRF; converting the IMS domain user identity into the PS domain MSISDN according to the mapping relationship between the IMS domain user identity and the PS domain MSISDN, specifically comprising: receiving the access authorization request message carrying the IMS domain user identity generated by the SBC / P-CSCF; parsing the received access authorization request message carrying the IMS domain user identity to obtain the IMS domain user identity, converting the IMS domain user identity into the PS domain MSISDN, and obtaining the access authorization request message carrying the PS domain MSISDN; forwarding the access authorization request message carrying the PS domain MSISDN to the corresponding network element, and the corresponding network element forwarding the access authorization request message to the PCF / PCRF, and obtaining the access authorization request message carrying the PS domain authorization authentication identifier, wherein the PS domain authorization authentication identifier includes the PS domain MSISDN and the IMSI; The forwarding module is used to forward the access authorization request message carrying the PS domain authorization authentication identifier to the PCF / PCRF. The PCF / PCRF performs authentication and authorization in the PS domain according to the PS domain authorization authentication identifier in the authorization request message to complete the establishment of the dedicated bearer.

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