CN102572785B - User's loaming method and ICS strengthen network - Google Patents

Abstract

The invention discloses a kind of user's loaming method, strengthen in network at ICS and set up BPF; Described method comprises: after Mobile Access Gateway controlling functions entity mAGCF receives the location update request message of user equipment (UE), when determining described UE for other network users, sends login request message to described BPF; After described BPF receives described login request message, the request message of the acquisition user data of the attaching position register HLR sent to belonging to described user is sent with Mobile solution agreement MAP message form; After described BPF receives the user data of described HLR transmission, send registration reply message to described mAGCF, described mAGCF sends position update response information to described UE.The present invention discloses a kind of ICS and strengthen network.Present invention achieves ICS and strengthen network to the compatibility of other network users, also can be realized the business in CS territory by IMS.

Description

User roaming method and ICS enhanced network

Technical Field

The present invention relates to a roaming technology in an IP Multimedia Subsystem (IMS) network architecture, and in particular, to an IMS Centralized Service (ICS) based user roaming method and an ICS enhanced network.

Background

An Internet Protocol (IP) multimedia Subsystem (IMS) is an IP-based Network architecture proposed by the third generation partnership Project (3 GPP), which constructs an open and flexible service environment, supports multimedia applications, and provides rich multimedia services to users.

The IMS is not related to an access technology, and may provide services for Packet Switching (PS) access networks such as General Packet Radio Service (GPRS) and Wireless Local Area Network (WLAN), and may also provide services for Mobile cellular networks such as Global System for Mobile communications (GSM) and Universal Mobile Telecommunications System (UMTS).

Mobile networks such as GSM and UMTS employ circuit-switched technologies, called Circuit Switched (CS) domain, which can provide basic voice services for users, as well as supplementary services based on voice services. When the CS domain accesses the IMS, it evolves to an access mode, and the services are provided by the IMS in a unified manner, and this technology is called IMS Centralized Service (ICS).

Fig. 1 is an architecture diagram of an IMS centralized control service, as shown in fig. 1, including: user Equipment (UE) 101, a global System for Mobile communications Radio Access Network (UTRAN, Universal Mobile telecommunications System Radio Access Network)/GSM EDGE Radio Access Network (GERAN, GSM EDGE Radio Access Network)102, an ICS Mobile switching Center Server (ICSMSC Server, ICS Mobile Switch Center Server)103, a circuit domain Media Gateway (CS-MGW, CS Media Gateway)104, a Home Subscriber Server (HSS, Home Subscriber Server)105, a Call Session Control Function entity (CSCF, Call Session Control Function)106, and a Telephony Application Server (TAS, Telephony Application Server) 107; wherein,

UTRAN/GERAN 102, is used for taking charge of the radio resource access control and management;

the ICS MSC Server 103, in addition to completing the access, mobility management, and call control functions of the CS user equipment, also serves as a Session Initiation Protocol (SIP) user agent, and implements the conversion between the CS signaling and the SIP message, instead of accessing the user to the IMS.

CS-MGW 104 for providing media resources and managing and controlling the media resources;

HSS 105 is configured to store subscription data of a subscriber and provide support for a call or session.

The CSCF 106 is further divided into an Interrogating CSCF (I-CSCF) and a Serving CSCF (S-CSCF). The I-CSCF interacts with the HSS to request the HSS to allocate the S-CSCF to the user or inquire the S-CSCF where the user is located; the S-CSCF provides functions for registration, call control, etc. for the user.

TAS 107, responsible for handling traditional CS domain telephony traffic.

UE 101 is accessed to ICS MSC Server 103 through CS control signaling, ICS MSC Server acts as user agent, replaces CS user equipment 101 to access CSCF 106 of IMS network, and establishes session connection with remote user, at the same time ICS MSC Server 103 controls CS-MGW 104 to complete the conversion between the media stream on CS bearing and the media stream on IP bearing, and establishes the media connection between user equipment 101 and remote user.

From the perspective of network development, it is accepted by the industry that the core network is finally developed to be uniformly managed by IMS, and 3GPP has established ICS technology in release 8, and enhanced access of the CS network to the IMS network through an MSC Server, which is a key technology for the evolution of the CS network to the IMS network. However, the existing ICS technology does not consider reducing the cost of the ICS MSC, and the existing standard only enhances based on the traditional Mobile Switching Center (MSC) to support the ICS service triggering, and actually, if the service is uniformly migrated to the IMS network, the ICS MSC can be simplified to reduce the cost of the core network.

Therefore, an ICS enhanced network architecture is proposed in the industry to weaken the function of the MSC Server, and compared with the traditional ICS, the CS network is completely sunk to an access layer, so that the network structure is simpler and does not depend on the CS Core and a No. seven signaling network.

Fig. 2 is a schematic diagram of an ICS enhanced network architecture, as shown in fig. 2, and on the basis of the structure shown in fig. 1, the following new network elements are included:

the difference between the Mobile Access gateway Control Function entity (mAGCF) 203 and the mAGCF203 and the ICS MSC Server 103 lies in that the mAGCF mainly provides signaling conversion between CS and SIP, does not have the Access management and service Control functions of the conventional CS domain MSC Server to the user any more, and cancels the interface with the conventional CS network, and the interworking between the mAGCF203 and the conventional CS network is realized by the Media gateway Control Function entity (MGCF, Media Gate Control Function) of the IMS network.

Fig. 3 is a flow chart of ICS enhanced service registration, as shown in fig. 3, a terminal accesses to an IMS network through mAGCF, and initiates registration in the IMS network. For simplicity, the flow in fig. 3 focuses on the location update procedure and the IMS registration procedure of the CS domain, and omits the security authentication procedure therein.

The ICS enhanced registration procedure comprises the following steps:

step 301-step 302, the UE initiates a CS attach procedure in the CS access network, and sends a CS location update request to the ICS MSC Server, where the message carries an International Mobile Subscriber Identity (IMSI) of the UE;

step 303, the ICS MSC Server converts the received location update request message into an SIP register message, obtains the User home domain name according to the Identity IMSI, and sends a register message to the UE home domain IMS network entry network element I-CSCF, where the register message carries a Private User Identity (PVI, Private User Identity) derived by the ICS MSC Server according to the IMSI of the UE.

Step 304, the I-CSCF receives the registration message, and inquires the registration state from the HSS, wherein the message carries the PVI of the UE. The HSS searches the current terminal registration state according to the PVI of the UE, if the registration is re-registered, the HSS returns the S-CSCF address registered by the UE, and if the registration is first registered, the HSS selects one S-CSCF address or returns one S-CSCF capability list;

step 305, if the HSS returns the S-CSCF address information, the I-CSCF forwards the registration request message to the S-CSCF, if the HSS returns the S-CSCF capability list, the I-CSCF selects an S-CSCF with the capability meeting the requirement and forwards the registration request message to the S-CSCF;

step 306, the S-CSCF receives the registration request message and may trigger the authentication procedure, which is not described herein too much for the sake of simplicity;

step 307, the S-CSCF acquires user service subscription data from the HSS;

step 308, the S-CSCF returns a registration success message to the mAGCF, where the message carries a Public User Identity (PUI) list available for the UE and a default PUI;

step 309, the mAGCF saves the S-CFCF address and the user identification list and the default PUI, and returns a location update success message to the UE;

in the ICS enhancement technology, the MSC function is weakened, no longer has a service processing function, and is only responsible for protocol conversion and resource management work, and service triggering and control are both centralized to the home IMS core network, whereas for the conventional CS network roaming mechanism, service control and triggering are handled by the visited MSC, so that according to the existing ICS enhancement technology, when the conventional user roams to the network described in the background technology, service cannot be triggered.

Disclosure of Invention

In view of this, the present invention mainly aims to provide a user roaming method and an ICS enhanced network, which can implement compatibility of the ICS enhanced network with communication services of other mobile network users.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a user roaming method, add the marginal agency Function network element (BPF, Bounds Proxy Function) in ICS enhanced network; the method comprises the following steps:

after receiving a location update request message of UE, the mAGCF sends a registration request message to the BPF when determining that the UE is other network users;

after receiving the registration request message, the BPF sends a request message for acquiring user data, which is sent to an HLR to which the user belongs, in a Mobile Application Protocol (MAP) message format;

and after receiving the user data sent by the HLR, the BPF sends a registration response message to the mAGCF, and the mAGCF sends a location update response message to the UE.

Preferably, the determining that the UE is another network user specifically includes:

configuring an ICS enhanced user identity list of the IMS centralized service in the mAGCF;

and after receiving the location updating request message of the UE, the mAGCF searches whether a matching item exists in the ICS enhanced user identity list according to the identity of the UE in the location updating request message, and if not, the UE is determined to be other network users.

Preferably, the determining that the UE is another network user specifically includes:

the mAGCF acquires the home domain information of the UE according to the IMSI of the UE in the location updating message, and sends a registration request message to an I-CSCF hosted by the UE; and the I-CSCF determines whether the UE is other network users, and informs the mAGCF when the UE is other network users.

Preferably, the determining that the UE is another network user specifically includes:

the mAGCF acquires the home domain information of the UE according to the IMSI of the UE in the location updating message, and sends a registration request message to an inquiring call session control function entity I-CSCF hosted by the UE;

and the I-CSCF inquires the registration state of the UE to an HSS to which the UE belongs, and informs the mAGCF when the UE is determined to be other network users according to the registration state of the UE returned by the HSS.

Preferably, the sending of the registration request message to the BPF specifically includes:

the mAGCF sends a registration request message to the BPF according to the BPF address information configured in the mAGCF;

or the mAGCF sends a redirection request message for the BPF to the I-CSCF, and sends a registration request message to the BPF according to the BPF address information in the redirection message returned by the I-CSCF;

or the mAGCF sends a registration request message to the I-CSCF, and the I-CSCF forwards the registration request message to the BPF.

Preferably, the sending, in a MAP message format, the request message for acquiring the subscriber data sent to the HLR to which the subscriber belongs specifically includes:

the BPF acquires PVI information of the UE in a registration request message and acquires IMSI of the UE according to the PVI information, and the BPF sends a location updating request message to an HLR to which the UE belongs based on an MAP protocol, wherein the location updating request message carries the IMSI information and the BPF address information.

Preferably, the receiving, by the BPF, the user data sent by the HLR specifically includes:

the HLR sends a user data inserting request message to the BPF based on a MAP protocol, wherein the user data inserting request message carries the service data signed by the user;

the method further comprises the following steps:

after receiving the service data signed by the user, the BPF triggers third party registration, and forwards the service data signed by the user to a Local telephone application Server (L-TAS).

Preferably, before triggering third party registration, the BPF generates a local Initial Filter Control (iFC), where the iFC includes address information of the L-TAS and service triggering standard information.

Preferably, the method further comprises:

after the BPF triggers the successful registration of a third party, sending a message of successful subscriber data insertion to the HLR;

after receiving the HLR position updating response message, the BPF sends a registration response message to the mAGCF;

and the MAGCF stores the BPF address information and Mobile station International identity number (MSISDN) information of the UE after receiving the registration response message.

An ICS enhanced network comprises an mAGCF, a BPF and an HLR; wherein,

the mAGCF is used for sending a registration request message to the BPF when the UE is determined to be other network users after receiving the position updating request message of the user equipment UE; after receiving the registration response message, sending a location update response message to the UE;

the BPF is used for sending a request message for acquiring user data sent to the HLR to which the user belongs in an MAP message format after receiving the registration request message; and after receiving the user data sent by the HLR, sending a registration response message to the mAGCF.

Preferably, configuring an ICS enhanced user identity list in the mAGCF; after receiving a location update request message of UE, the mAGCF searches whether a matching item exists in the ICS enhanced user identity list according to the identity of the UE in the location update request message, and if not, the mAGCF determines that the UE is other network users.

Preferably, the mAGCF acquires home domain information of the UE according to the IMSI of the UE in the location update message, and sends a registration request message to an I-CSCF hosted by the UE;

the I-CSCF further determines whether the UE is other network user, and informs the mAGCF when the UE is other network user.

Preferably, the mAGCF further obtains the home domain information of the UE according to the IMSI of the UE in the location update message, and sends a registration request message to an interrogating call session control function entity I-CSCF hosted by the UE;

and the I-CSCF inquires the registration state of the UE to an HSS to which the UE belongs, and informs the mAGCF when the UE is determined to be other network users according to the registration state of the UE returned by the HSS.

Preferably, the mAGCF sends a registration request message to the BPF according to the BPF address information configured in the mAGCF itself;

or the mAGCF sends a redirection request message for the BPF to the I-CSCF, and sends a registration request message to the BPF according to the BPF address information in the redirection message returned by the I-CSCF;

or the mAGCF sends a registration request message to the I-CSCF, and the I-CSCF forwards the registration request message to the BPF.

Preferably, the BPF further obtains PVI information of the UE in the registration request message, and obtains the IMSI of the UE according to the PVI information, and the BPF sends a location update request message to the HLR to which the UE belongs based on a MAP protocol, where the location update request message carries the IMSI information and the BPF address information.

Preferably, the HLR sends a subscriber data insertion request message to the BPF based on a MAP protocol, where the subscriber data insertion request message carries service data signed by the subscriber;

and after receiving the service data signed by the user, the BPF triggers third party registration and forwards the service data signed by the user to the L-TAS.

Preferably, the BPF generates a local initial filter control iFC before triggering third party registration, where the iFC includes address information of the L-TAS and service trigger criteria information.

Preferably, after the BPF triggers successful registration of the third party, a successful subscriber data insertion message is sent to the HLR;

after receiving the HLR position updating response message, the BPF sends a registration response message to the mAGCF;

and the mAGCF stores the BPF address information and the MSISDN information of the UE after receiving the registration response message.

In the invention, when the non-ICS enhanced network UE roams into the ICS enhanced network, because the ICS enhanced network is not compatible with the existing mobile network, for the UE which roams into the ICS enhanced network, the UE can not realize the registration to the ICS enhanced network, and therefore the UE can not enjoy the communication service provided by the ICS enhanced network. The invention is used for realizing the registration of the UE of the non-ICS enhanced network by setting the BPF, so that the ICS enhanced network can develop corresponding communication service according to the acquired user subscription data. The invention realizes the compatibility of the ICS enhanced network to other network users, and can also realize the service of the CS domain through the IMS.

Drawings

Fig. 1 is an architecture diagram of an IMS centralized control service;

FIG. 2 is a schematic diagram of an ICS-enhanced network architecture;

FIG. 3 is a flowchart of ICS enhanced service registration;

FIG. 4 is a schematic diagram of an ICS-enhanced network architecture according to the present invention;

FIG. 5 is a flowchart illustrating a conventional user roaming to an ICS enhanced network according to a first embodiment of the present invention;

FIG. 6 is a flowchart illustrating a conventional user roaming to an ICS enhanced network according to a second embodiment of the present invention;

fig. 7 is a flowchart illustrating a conventional user roaming to an ICS-enhanced network registration process in a third embodiment of the present invention.

Detailed Description

The basic idea of the invention is that BPF is added in the ICS enhanced network for realizing registration of UE of the non-ICS enhanced network, so that the ICS enhanced network can develop corresponding communication service according to the acquired user subscription data.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings by way of examples.

Fig. 4 is a schematic diagram of an ICS-enhanced network architecture of the present invention, as shown in fig. 4, compared with the existing ICS-enhanced network, the ICS-enhanced network of the present invention adds a BPF, and in addition, the present invention also correspondingly upgrades mAGCF, I-CSCF, HSS, and L-TAS network elements in the ICS-enhanced network, so as to enhance the corresponding functions of these network elements, specifically:

the mAGCF is used for sensing whether the current UE is the other network user or not when the UE is attached, and selecting a proper BPF to send a registration request when finding that the user of the other network roams to the ICS enhanced network;

after receiving the redirection request message of the I-CSCF, the mAGCF sends a registration message according to the redirection address in the message;

the mAGCF further has a capability of acquiring a Temporary identity (TMSI), and when the mAGCF receives a Temporary identity user identifier carried in a location update request message, the mAGCF acquires an international Mobile identity IMSI of the UE, where the acquisition mode includes the following modes:

a, mAGCF is acquired from the UE;

b, or the mAGCF acquires the mAGCF distributing the TMSI according to the TMSI if the TMSI can be identified, or acquires through the MSC.

The I-CSCF is used for sensing whether the current UE is other network users or not when receiving the registration request message, and informing the mAGCF to be redirected to the BPF or forwarding the registration request message to the BPF through the redirection request message when finding that the UE is the other network user and roams to an ICS enhanced network;

HSS, which is used to receive I-CSCF inquiry user register state information and return user's indication as other network user when judging the current UE is other network user;

the BPF has protocol conversion capability, stores registration information after receiving a registration request message, acquires PVI information of UE in the registration request message, and acquires IMSI of the UE according to the PVI information of the UE, wherein the BPF adopts an MAP protocol to send a position updating request message to an HLR to which the UE belongs, and the position updating request message carries IMSI information and BPF address information of the UE;

the BPF is also used for storing user data, triggering third party registration after receiving the user data insertion request message, and forwarding the acquired user signing service data to a local telephone application server L-TAS;

before the BPF triggers the third party registration, generating a local initial filter control iFC, wherein the iFC comprises an L-TAS address and a service triggering standard;

the BPF also stores the registration address of the mAGCF; providing a routing number, and after receiving a CS domain roaming number providing request message of UE, BPF allocates the routing number or acquires the routing number through L-TAS;

the BPF receives the call establishment request and routes the call to the L-TAS according to the L-iFC;

the L-TAS provides a routing number, and distributes the routing number after receiving the BPF roaming number providing request message;

and the CS service control receives the session invitation message and triggers the service control according to the signed service.

How the present invention implements user roaming is further described in detail below in conjunction with the above network structure.

Fig. 5 is a flowchart illustrating a registration process when a conventional user roams to an ICS enhanced network according to a first embodiment of the present invention, and as shown in fig. 5, this embodiment describes that a conventional CS user roams to an ICS enhanced network, after receiving a location update request message from a UE, an mAGCF determines that the user is another network user, selects a BPF to send the registration request message, and before the BPF initiates the location update request message to an HLR to which the UE belongs, the BPF converts the location update request message from an SIP format to an MAP format; thereby obtaining the subscriber subscription data flow from the HLR. The method specifically comprises the following steps:

step 501-step 502, the traditional UE roams to the ICS enhanced network, and sends a location update request message through the CS wireless access network, where the location update request message carries the identity IMSI information of the UE;

step 503, after receiving the UE location update request message, the mAGCF determines whether the UE is another network user according to the user identity IMSI in the message, and determines whether the network element can adopt the following manner:

an ICS enhanced user identity list configured by the mAGCF in advance judges whether the current user belongs to the list, and if not, the current user is considered as other network users;

or, the mAGCF analyzes the IMSI Number, and generally, the IMSI Number is composed of a Mobile Country Number (MCC, Mobile Country Code), a Mobile Network Number (MNC, Mobile Network Code), and a Mobile UE identification Number (MSIN, Mobile Subscriber identity Number), where the MSIN is composed of an HLR Number and a Subscriber Number SN, and the mAGCF may determine whether the current Subscriber belongs to the ICS-enhanced Network through the MCC + MNC or the MCC + MNC + HLR Number in the IMSI;

or, the mAGCF queries other network elements of the network, such as a domain name server DNS;

if the UE is judged to be other network users, selecting an adjacent BPF;

if the user identity in the location update message is TMSI, the mAGCF acquires the international mobile identity IMSI of the UE, and the acquisition mode comprises the following modes:

a. the mAGCF is acquired from the UE;

b. or if the mAGCF recognizes the temporary identity user identification (TMSI), the mAGCF acquires the TMSI from the mAGCF or the MSC;

step 504, the mAGCF deduces the IMS network private user identity PVI from the IMIS, or directly adopts the IMSI, and sends an SIP registration request message to the BPF, where the registration request message carries the IMIS or PVI information of the UE and the mAGCF address information;

step 505, after receiving the registration request message, the BPF acquires IMSI information in the registration request message, or re-deduces IMSI information of the user according to PVI, and stores the binding relationship between IMSI and mAGCF address, and sends a location update request message to the HLR to which the UE belongs by using MAP protocol, where the location update request message carries IMSI information and BPF address information;

step 506, the HLR stores the corresponding relation between the IMSI and BPF address information of the user;

step 507, the HLR sends a user data insertion request message to the BPF, wherein the user data insertion request message carries the subscription data information of the user;

step 508, BPF saves the user data information, after finishing saving, return and insert the user data and finish the message to HLR;

509, the HLR returns a location update response message indicating that the location update is successful;

step 510, the BPF generates the L-iFC, and the generation of the L-iFC comprises the following steps:

a. the BPF selects a target L-TAS and sets the target L-TAS AS an AS address parameter in the L-iFC

b. The BPF determines an L-iFC service trigger event and logic;

the BPF triggers a third party to register, and forwards the acquired user signing service data to a local telephone application server L-TAS;

it should be noted that the step 510 may occur before the step 508;

step 511, the BPF returns registration 200OK to notify mAGCF that the registration is completed, and the 200OK message carries MSISDN number of the user;

step 512-step 513, the mAGCF returns a location update response message to the UE;

fig. 6 is a flowchart illustrating a conventional user roaming to an ICS enhanced network registration process according to a second embodiment of the present invention, where the difference between the first embodiment and the second embodiment is that after receiving a location update request message, the mAGCF deduces a home domain of the user according to the IMSI of the user, and sends a registration request message to an I-CSCF at a home domain entry of the user, and the I-CSCF determines that the current UE is another network user, and notifies the mAGCF to forward the registration message to the BPF through a redirection message;

601 to 602, and 501 to 502;

step 603, after receiving the location update message, the mAGCF deduces an IMS network private user identity PVI according to the IMIS in the location update message, and sends an IMS registration request message to an ingress address I-CSCF of the user home domain;

step 604, I-CSCF receives the user registration request message, and determines whether the current UE is another network user, the determining method includes the following steps:

an ICS enhanced user identity list configured in advance by the I-CSCF judges whether the current user belongs to the list, and if not, the current user is considered as other network users;

or the I-CSCF analyzes the PVI number, judges whether the current user belongs to the ICS enhanced network, and if not, the current user is considered as other network users;

or, I-CSCF inquires HSS whether current UE is other network user;

if the I-CSCF finds that the current user is other network users, the I-CSCF sends a redirection request message to the mAGCF, the redirection request message carries destination BPF address information, and the mAGCF is informed to redirect the registration message to the destination BPF;

step 605, according to the destination address in the redirection request message, the mAGCF redirects the registration message to the destination BPF;

step 606 to step 613, and step 506 to step 513 are synchronized, and are not described herein again.

Fig. 7 is a flowchart illustrating a conventional user roaming to an ICS enhanced network registration process according to a third embodiment of the present invention, where the difference between the present embodiment and the second embodiment is that after receiving a location update request message, the mAGCF deduces a home domain of the user according to the IMSI of the user, sends a registration request message to an I-CSCF at a home domain entry of the user, and the I-CSCF finds that the user is another network user, and forwards the registration request message to the BPF;

step 701 to step 703, and step 601 to step 603;

step 704, the I-CSCF perceives that the user is other network user, will select a BPF, forward the registration request message to the destination BPF;

step 705-step 713, and step 606-step 614, which are not described herein again.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims (18)

1. A user roaming method is characterized in that a marginal proxy function network element BPF is additionally arranged in an IMS centralized service ICS enhanced network; the method comprises the following steps:

after receiving a location update request message of User Equipment (UE) by a mobile access gateway control function (mAGCF), when determining that the UE is other network users, sending a registration request message to the BPF;

after receiving the registration request message, the BPF sends a request message for acquiring user data, which is sent to a Home Location Register (HLR) to which the user belongs, in a Mobile Application Protocol (MAP) message format;

and after receiving the user data sent by the HLR, the BPF sends a registration response message to the mAGCF, and the mAGCF sends a location update response message to the UE.

2. The method of claim 1, wherein the determining that the UE is another network user is specifically:

configuring an ICS enhanced user identity list in the mAGCF;

and after receiving the location updating request message of the UE, the mAGCF searches whether a matching item exists in the ICS enhanced user identity list according to the identity of the UE in the location updating request message, and if not, the UE is determined to be other network users.

3. The method of claim 1, wherein the determining that the UE is another network user is specifically:

the mAGCF acquires the home domain information of the UE according to the International Mobile Subscriber Identity (IMSI) of the UE in the location updating message, and sends a registration request message to an inquiring call session control function entity (I-CSCF) hosted by the UE; and the I-CSCF determines whether the UE is other network users, and informs the mAGCF when the UE is other network users.

4. The method of claim 1, wherein the determining that the UE is another network user is specifically:

the mAGCF acquires the home domain information of the UE according to the International Mobile Subscriber Identity (IMSI) of the UE in the location updating message, and sends a registration request message to an inquiring call session control function entity (I-CSCF) hosted by the UE;

and the I-CSCF inquires the registration state of the UE to an HSS to which the UE belongs, and informs the mAGCF when the UE is determined to be other network users according to the registration state of the UE returned by the HSS.

5. The method according to claim 1, wherein the sending of the registration request message to the BPF is specifically:

the mAGCF sends a registration request message to the BPF according to the BPF address information configured in the mAGCF;

or the mAGCF sends a redirection request message for the BPF to an I-CSCF hosted by the UE, and sends a registration request message to the BPF according to the BPF address information in the redirection message returned by the I-CSCF;

or the mAGCF sends a registration request message to an I-CSCF (inter-call session control function) hosted by the UE, and the I-CSCF forwards the registration request message to the BPF.

6. The method according to claim 1, wherein said sending the request message for obtaining subscriber data sent to the home location register HLR to which the subscriber belongs in a mobile application protocol MAP message format is specifically:

the BPF acquires PVI information of the private user identity of the UE in a registration request message, acquires IMSI of the UE according to the PVI information, and sends a location updating request message to an HLR to which the UE belongs on the basis of a MAP protocol, wherein the location updating request message carries the IMSI information and the BPF address information.

7. The method of claim 1, wherein the step of the BPF receiving the subscriber data sent by the HLR is specifically as follows:

the HLR sends a user data inserting request message to the BPF based on a MAP protocol, wherein the user data inserting request message carries the service data signed by the user;

the method further comprises the following steps:

and after receiving the service data signed by the user, the BPF triggers third party registration and forwards the service data signed by the user to a local telephone application server (L-TAS).

8. The method of claim 7, wherein the BPF generates a local initial filter control iFC before triggering third party registration, wherein the iFC includes address information of the L-TAS and service triggering criteria information.

9. The method of claim 7, further comprising:

after the BPF triggers the successful registration of a third party, sending a message of successful subscriber data insertion to the HLR;

after receiving the HLR position updating response message, the BPF sends a registration response message to the mAGCF;

and the mAGCF stores the BPF address information and the MSISDN information of the mobile subscriber international number of the UE after receiving the registration response message.

10. An ICS enhanced network of IMS centralized service is characterized in that the ICS enhanced network comprises a mobile access gateway control function entity mAGCF, a marginal proxy function network element BPF and a home location register HLR; wherein,

the mAGCF is configured to send a registration request message to the BPF when it is determined that the UE is another network user after receiving a location update request message of the UE; after receiving the registration response message, sending a location update response message to the UE;

the BPF is used for sending a request message for acquiring user data sent to the HLR to which the user belongs in an MAP message format after receiving the registration request message; and after receiving the user data sent by the HLR, sending a registration response message to the mAGCF.

11. The ICS-enhanced network of claim 10, wherein an ICS-enhanced user identity list is configured in the mAGCF; after receiving a location update request message of UE, the mAGCF searches whether a matching item exists in the ICS enhanced user identity list according to the identity of the UE in the location update request message, and if not, the mAGCF determines that the UE is other network users.

12. The ICS enhanced network of claim 10, wherein the mAGCF obtains home domain information of the UE according to the IMSI of the UE in the location update message, and sends a registration request message to an interrogating call session control function entity I-CSCF hosted by the UE;

the I-CSCF further determines whether the UE is other network user, and informs the mAGCF when the UE is other network user.

13. The ICS enhanced network of claim 10, wherein the mAGCF further obtains home domain information of the UE according to the IMSI of the UE in the location update message, and sends a registration request message to an interrogating call session control function entity I-CSCF hosted by the UE;

and the I-CSCF inquires the registration state of the UE to an HSS to which the UE belongs, and informs the mAGCF when the UE is determined to be other network users according to the registration state of the UE returned by the HSS.

14. The ICS enhanced network of claim 10, wherein the mAGCF sends a registration request message to the BPF according to the BPF address information configured in itself;

or the mAGCF sends a redirection request message for the BPF to an I-CSCF hosted by the UE, and sends a registration request message to the BPF according to the BPF address information in the redirection message returned by the I-CSCF;

or the mAGCF sends a registration request message to an I-CSCF (inter-call session control function) hosted by the UE, and the I-CSCF forwards the registration request message to the BPF.

15. The ICS-enhanced network of claim 10, wherein the BPF further obtains PVI information of the UE in a registration request message, and obtains an IMSI of the UE according to the PVI information, and the BPF sends a location update request message to an HLR to which the UE belongs based on a MAP protocol, wherein the location update request message carries the IMSI information and the BPF address information.

16. The ICS-enhanced network of claim 10, wherein the HLR sends an insert subscriber data request message to the BPF based on a MAP protocol, and the insert subscriber data request message carries service data signed by the subscriber;

and after receiving the service data signed by the user, the BPF triggers third party registration and forwards the service data signed by the user to a local telephone application server (L-TAS).

17. The ICS-enhanced network of claim 16, wherein the BPF generates a local initial filter control iFC before triggering third party registration, wherein the iFC includes address information of L-TAS and service triggering criteria information.

18. The ICS-enhanced network of claim 16, wherein the BPF sends a insert subscriber data success message to the HLR after triggering successful third party registration;

after receiving the HLR position updating response message, the BPF sends a registration response message to the mAGCF;

and the mAGCF stores the BPF address information and the MSISDN information of the mobile subscriber international number of the UE after receiving the registration response message.