CN100421405C - Network and method for accessing multimedia services for mobile terminals in non-packet mode - Google Patents

Abstract

The invention relates to a network for accessing multimedia services for mobile terminals in non-packet mode. The problem that the mobile terminal cannot register in the IMS domain in the prior art is solved. Including: a wireless access network, used to access the mobile user; IMS, providing multimedia services for the mobile user; a media gateway, used to control the conversion between the bearer in the circuit domain and the bearer in the IMS domain; it is characterized in that it also includes : The MAUA communicates with the wireless access network and the media gateway, connects the mobile user to the IMS through the wireless access network, and manages the mobile user. On the premise that services are also provided to users by the IMS network, the present invention changes the bearer of the core network level to be provided by IP switching, and completely discards traditional circuit switching signaling such as ISUP/TUP/MAP in the solution. In this way, signaling detours can be reduced, and at the same time, larger bandwidth can be provided to provide users with richer multimedia services.

Description

Network and method for accessing multimedia services for mobile terminals in non-packet mode

technical field

The invention relates to the communication field, in particular to a network and a method for accessing multimedia services for mobile terminals in non-packet mode.

Background technique

The IP multimedia subsystem is a new functional module added by 3GPP to the WCDMA R5 system. It is responsible for providing relevant control mechanisms for IP-based multimedia services (such as VoIP, conference TV services, etc.) on the basis of packet domain connections. The main functional entities of the system include: Call State Control Function (CSCF), Media Gateway Control Function (MGCF), and Media Resource Function (MRF). The main functions of these functional entities are:

1. Call State Control Function (CSCF):

The IP Multimedia Subsystem includes three different call state control functions: Inquiring CSCF (I-CSCF), Proxy CSCF (P-CSCF), and Serving CSCF (S-CSCF).

P-CSCF is the first step for UE to contact IMS. It will be forwarded to a SIP server in the home network before the UE receives the SIP message, and vice versa. According to a set of rules (such as address analysis and possible modification) set by the network operator, the P-CSCF can also modify an outgoing request. The function of the I-CSCF is to provide the entrance to the home network, hide the topology map of the home network from other networks, and can flexibly select the S-CSCF. The S-CSCF completes the session control function of the UE, including routing the initiated session to the external network, and routing the terminated session to the visited network. When an incoming SIP session requests service processing, the S-CSCF decides whether an application server is required to accept relevant information. This decision is based on information received from the HSS or other sources such as application servers. All CSCF functions can generate and export call detail records for billing processing.

2. Home Subscriber Server (HSS):

HSS is evolved from Home Location Register (HLR) and Authentication Center (AUC), and is a master database for a given subscriber. It is an entity containing registration information used to support network entities in handling calls/sessions. It also supports user authentication and authorization function (AAA). Through authentication, authorization, name/address resolution and other services, HSS helps the call control server to complete the route selection/roaming function.

HSS is responsible for saving the following user-related information: (1) user identification, number and address information; (2) user security information, which is used for network access control information required for authentication and authorization; (3) at the inter-system level User location information, that is, HSS handles user registration and stores location information between systems, etc.; (4) User profile information.

Based on the above information, the HSS can also provide support for entities of different control systems (circuit domain control, PS domain control, IP multimedia control, etc.).

3. Media Gateway Control Function (MGCF):

For a specific network, the MGCF is the termination point of the PSTN/PLMN network. It has the following functions: (1) control of the call state, that is, control the part related to the media channel connection in the MGW; (2) communicate with the CSCF; (3) for calls from the traditional network, the MGCF according to their The routing number selects the corresponding CSCF; (4) Realize the conversion between traditional network call control protocols (such as ISUP R1/R2) and R4/R5 network call control protocols; (5) MGCF can receive out-of-band information and then send it To CSCF/MGW.

4. Multimedia Resource Function (MRF):

The functions realized by MRF are: (1) Provide multi-party call and multimedia conference function, which has the same function as the multipoint control unit (MCU) in the H.323 network; (2) In multi-party/multimedia conference, communicate with GGSN and MGW It is jointly responsible for bearer service control; (3) It can communicate with CSCF and perform service authentication for multi-party/multimedia sessions.

With the development of communication technology, the bearer of the next-generation communication network has begun to switch to IP. From the perspective of the development of the communication network, whether it is Code Division Multiple Access (CDMA) or Global System for Mobile Communications (GSM)/Broadband Code Division Multiple Access Address (WCDMA), have experienced such an evolution process from the traditional circuit switching network to the IP packet switching network with separated control and bearer, and then to the all-IP multimedia network.

Take the evolution of CDMA as an example: CDMA network bearer has changed from the initial time division multiplexing (TDM) bearer to the definition of two evolution stages, the traditional mobile station domain (LMSD) and the multimedia domain (MMD), and IP is selected as the core network and access In the CDMALMSD stage, the circuit domain realizes the separation of bearer and control, and supports IP in the bearer type; the MMD version introduces the IP Multimedia Subsystem (IMS) domain in the core network, Interface signaling is IP-based (using SIP signaling). The ultimate goal in this evolution process is to provide services by a unified IMS network. However, in the process of evolving to IMS, how do a large number of existing network equipment in the traditional circuit switching stage and control and bearer separation stage continue to function? How can the non-IMS terminal in the mobile phone access to the IMS network to enjoy the rich multimedia services provided by the IMS? This is a problem that needs to be solved.

There is an "overlay" solution in the prior art, as shown in Figure 1, in which the mobile switching center server (MSC SERVER) is the control core of the traditional circuit domain. (RAN) connects and controls mobile users, and on the one hand, performs data management and location management on users through MAP signaling and a home location register (HLR) connection. The intercommunication between the circuit domain and the IMS domain is accomplished through the Media Gateway Control Function (MGCF) unit. On the one hand, it intercommunicates with MSCSERVER through Integrated Services Data Network (ISDN) User Part (ISUP) signaling, and on the other hand, it communicates with the call session control The functional (CSCF) unit communicates through Session Initiation Protocol (SIP) signaling, where it performs the conversion function of ISUP and SIP signaling, and it can also communicate with H.248 signaling to control the Media Gateway (MGW) for possible TDM Conversion to IP bearer. In this solution, the core network of the circuit domain and the core network of the multimedia domain are independently set up, and the intercommunication is performed by MGCF+MGW in the middle. Calls made by traditional terminals in the circuit domain will first be routed to the MGCF through circuit domain control signaling such as ISUP, which will be converted into SIP signaling by the MGCF and sent to the multimedia domain, and then the multimedia domain will perform service control and charging, etc. . After the multimedia domain is processed, the processed signaling is sent back to the circuit domain via the MGCF for connection.

But this scheme has the following problems:

First of all, the terminal cannot register in the IMS domain, and can only be routed to the IMS domain when a call occurs. The IMS domain can only control common calling services, and cannot provide more IMS services such as presence services (Presence), click-to-call, Internet phonebook, etc. to the terminal.

Secondly, the call signaling must be overlayed to the IMS domain, causing signaling detours.

Thirdly, this solution requires the intercommunication of circuit domain control signaling (such as ISUP) and SIP signaling, and many supplementary services cannot be completely realized.

Contents of the invention

Aiming at the shortcomings of the prior art, the present invention proposes a network and method for non-packet mode mobile terminals to access multimedia services, so as to solve the problem in the prior art that mobile terminals cannot register in the IMS domain, reduce signaling overhead, save system resource.

The inventive network includes:

A network for accessing multimedia services for mobile terminals in non-packet mode, comprising:

The radio access network RAN is used for accessing the mobile user;

IP Multimedia Subsystem IMS provides multimedia services for mobile users;

The media gateway is used to control the conversion between the circuit domain bearer and the IP multimedia subsystem IMS domain bearer;

It is characterized in that it also includes:

The mobile user access agent unit MAUA communicates with the wireless access network and the media gateway, connects the mobile user to the IP multimedia subsystem IMS through the wireless access network, and manages the mobile user.

The mobile user access agent unit MAUA includes:

The radio access network RAN signaling processing unit is used to process signaling with the radio access network RAN;

The IP Multimedia Subsystem IMS signaling processing unit is used to process signaling with the IP Multimedia Subsystem IMS;

The media gateway MGW signaling processing unit is used to process signaling with the media gateway MGW;

The radio access network RAN signaling and IP multimedia subsystem IMS signaling bidirectional conversion unit is used for bidirectional conversion of radio access network RAN signaling and IP multimedia subsystem IMS signaling.

The mobile user access agent unit MAUA also includes a charging interface unit, which is used to report the charging information of the access layer to the IP Multimedia Subsystem IMS domain charging entity and provide the IP Multimedia Subsystem IMS domain with it and Information associated with business layer billing.

The radio access network RAN may be a time-division multiplexing TDM bearer, or an IP bearer.

The communication between the mobile user access agent unit MAUA and the media gateway MGW is through the H.28 protocol.

A network for accessing multimedia services for mobile terminals in non-packet mode, comprising:

The radio access network RAN is used to access the mobile user;

IP Multimedia Subsystem IMS provides multimedia services for mobile users;

It is characterized in that it also includes:

The mobile user access agent unit MAUA communicates with the radio access network RAN, connects the mobile user to the IP multimedia subsystem IMS through the radio access network RAN, and manages the mobile user.

The mobile user access agent unit MAUA includes:

The radio access network RAN signaling processing unit is used to process signaling with the radio access network RAN;

The IP Multimedia Subsystem IMS signaling processing unit is used to process signaling with the IP Multimedia Subsystem IMS;

The radio access network RAN signaling and IP multimedia subsystem IMS signaling bidirectional conversion unit is used for bidirectional conversion of radio access network RAN signaling and IP multimedia subsystem IMS signaling.

The mobile user access agent unit MAUA also includes a charging interface unit for processing mobile user charging information.

The RAN may be a time division multiplexing TDM bearer, or an IP bearer.

The inventive method comprises:

A method for accessing multimedia services for a mobile terminal in a non-packet mode, wherein a mobile user accesses an IP multimedia subsystem IMS through a wireless access network, and is characterized in that:

A mobile user access agent unit MAUA is set in the network. When a mobile user initially accesses the mobile network, the mobile user access agent unit MAUA initiates a registration request to the IP Multimedia Subsystem IMS domain instead of the mobile user, and sends the mobile user Register to the IP Multimedia Subsystem IMS domain;

When a mobile user initiates a service request, the mobile user access agent unit MAUA initiates a session request to the IP Multimedia Subsystem IMS domain instead of the mobile user, and performs subsequent call processing according to the response of the IP Multimedia Subsystem IMS domain;

When a call needs to be connected to a mobile user, the mobile user access agent unit MAUA receives the session request from the IP Multimedia Subsystem IMS domain instead of the mobile user, and performs paging and connection to the mobile user on the radio access network RAN.

On the premise that the IMS network also provides services to users, the present invention changes the bearer at the core network level to be provided by IP switching, and completely discards traditional circuit switching signaling such as ISUP/TUP/MAP in the solution. In this way, signaling detours can be reduced, and at the same time, larger bandwidth can be provided to provide users with richer multimedia services.

Description of drawings

FIG. 1 is a schematic diagram of a network using an OVERLAY solution in the prior art;

FIG. 2 is a schematic diagram of the network structure of Embodiment 1 of the present invention;

Fig. 3 is the structural representation of the MAUA of embodiment 1 of the present invention;

FIG. 4 is a schematic diagram of the network structure of Embodiment 2 of the present invention;

Fig. 5 is the structural representation of the MAUA of embodiment 2 of the present invention;

Fig. 6 is a signaling flowchart for initiating a location when a user terminal is turned on under the network structure of the present invention;

FIG. 7 is a signaling flow chart of a user terminal initiating a calling process under the network structure of the present invention;

Fig. 8 is a signaling flow chart of a user terminal as a called party under the network structure of the present invention.

Detailed ways

The specific implementation manners of the present invention will be described below in conjunction with the accompanying drawings.

The present invention aims at the shortcomings of the prior art, under the same premise that the IMS network provides services to users, the bearer at the core network level is changed to be provided by IP switching, and the traditional circuit switching signaling such as ISUP/ TUP/MAP etc. In this way, signaling detours can be reduced, and at the same time, larger bandwidth can be provided to provide users with richer multimedia services.

The solution of the present invention is divided into two situations: there is a media gateway (MGW) and there is no media gateway.

Embodiment 1: The case where there is an MGW.

As shown in Figure 2, it is a schematic diagram of the network structure of Embodiment 1 of the present invention. In this network structure, an MGW is arranged. It can be seen from the figure that the network for mobile users in non-packet mode to access multimedia services in the present invention mainly includes the following components part:

RAN, for accessing the mobile user;

IMS, providing multimedia services for mobile users;

The MGW is used to control the conversion between the bearer in the circuit domain and the bearer in the IMS domain;

On the basis of the above content, the network adds a mobile user access agent unit (MAUA), which communicates with the RAN and MGW, accesses the mobile user to the IMS through the RAN, and manages the mobile user. Including registering, authenticating, initiating a session, accepting a session, etc. for the UE.

This solution introduces the functional unit MAUA, which is responsible for connecting users to the IMS domain, as shown in Figure 3. In this solution, MAUA includes:

RAN signaling processing unit, used to process signaling with RAN, similar to the function of MSC SERVER;

The IMS signaling processing unit is used to process signaling with IMS, similar to the function of SIP UE;

The MGW signaling processing unit is used to process signaling with the MGW;

The RAN signaling and IMS signaling bidirectional conversion unit is used for bidirectional conversion of RAN signaling and IMS signaling. It includes converting the circuit domain signaling sent by traditional terminals through the wireless access network into SIP signaling and sending it to the IMS domain for service requests, and also converting the SIP signaling sent by the IMS domain into circuit domain signaling through wireless access. The network sends it to the traditional terminal to instruct the terminal to perform business operations such as calling, authentication, etc.

The above-mentioned signaling with the RAN includes A-interface signaling between the CS domain core network and the access network. This signaling can be carried on TDM or IP.

The MAUA may also include:

The charging interface unit is used to process the charging information of the mobile user.

The above charging interface unit is mainly for associating the charging information of the access network and the core network, and its specific operations include assigning charging identifiers, sending charging information such as Diameter format, RADIUS format or some custom format Order and so on.

The network under this solution also includes a Call Session Control Function (CSCF) unit for session control and service triggering;

Application server (AS), used to provide application services to mobile users;

HSS, used to store user business data;

The charging system is used for charging the multimedia services provided by the mobile users.

The RAN may be a TDM bearer or an IP bearer.

The setting of MAUA in the above scheme can be set up together with P-CSCF (or the function of P-CSCF can be added by itself), or it can be directly connected to I-CSCF in IMS domain;

In the networking situation of Embodiment 1, the media streams need to pass through the A interface, and communicate through the MGWs in each network.

The biggest difference between the network diagram of Embodiment 1 and the OVERLAY network in the prior art is that in the OVERLAY mode, the CS domain and the IMS domain are two parallel domains, while in the solution of Embodiment 1, the CS domain is reduced to IMS Domain access network.

The RAN is responsible for connecting the MS to the CS domain network, and the MAUA is responsible for connecting the user to the IMS domain. CSCF is the control core entity of the IMS domain, which is responsible for session control and service triggering. The HSS is an entity that stores user service data in the IMS domain. AS is a server that provides various specific application services to users. Coupled with entities responsible for charging (such as CCF, Charging Collecting Function or AAA, Authentication Authorization Accouting), the core network of the IMS domain is formed.

Embodiment 2: There is no MGW.

As shown in Figure 4,

In this networking situation, the media stream is directly carried by the IP out of the BSC without passing through the A interface, and communicates through the IP network. At the same time, the network shall provide a Media Resource Function (MRF) entity to provide the playback resources required during the call.

The biggest difference between the solution of embodiment 2 and the solution of embodiment 1 is that the MGW network entity associated with each MAUA is canceled in the network, and the MRF entity shared by the whole network is used to replace its media resource capability (that is, to provide various playback, conference chip, etc.). Since the entity MGW is not needed, the MAUA does not need to provide the control capability of the MGW, that is, it does not need to support the H.248 protocol.

As shown in Figure 4, it is a schematic diagram of the network structure without MGW. It can be seen from the figure, including:

RAN, for accessing the mobile user;

IMS, providing multimedia services for mobile users;

On the above basis, the network adds MAUA, communicates with the RAN, accesses the mobile user to the IMS through the RAN, and manages the mobile user.

The network can also include:

The MRF unit is used to provide the playback resources required during the call;

CSCF unit, used for session control and service triggering;

AS, used to provide application services to mobile users;

HSS, used to store user business data;

The charging system is used for charging the multimedia services provided by the mobile users. The billing system may be a billing collection function unit.

The solution of embodiment 2 also introduces the functional unit MAUA, which is responsible for connecting users to the IMS domain, which is different from the solution in embodiment 1. As shown in Figure 5, the MAUA in embodiment 2 includes:

RAN signaling processing unit, used to process signaling with RAN, similar to the function of MSC SERVER;

The IMS signaling processing unit is used to process signaling with IMS, similar to the function of SIP UE;

The RAN signaling and IMS signaling bidirectional conversion unit is used for bidirectional conversion of RAN signaling and IMS signaling.

The MAUA may also include a charging interface unit for processing mobile user charging information.

In the above two embodiments, regardless of whether there is an MGW, a MAUA must be set, and its functions are:

Process circuit domain signaling with RAN, and provide mobility management and location management functions for traditional mobile terminals roaming under MAUA management visits;

As a SIP UA, it replaces traditional mobile terminals roaming in the MAUA and visits underground to perform SIP registration and initiate/receive SIP sessions in the IMS domain;

Two-way conversion between circuit domain signaling and SIP signaling between the wireless access network, so as to complete the function of connecting traditional mobile terminals to the IMS domain;

It has the function of providing charging information to the IMS domain, and can provide a charging interface;

In the case of a media gateway, it is necessary to be able to manage the terrestrial circuit resources and inter-office bearer resources maintained by the media gateway to the wireless access network through the H.248 protocol; The protocol controls the MRF (Media Resource Function) entity to provide various media resources to the terminal and the network, and it must be able to control the inter-office bearer resources on the wireless access network through enhanced circuit domain signaling with the wireless access network.

The MAUA set in the present invention may be co-established with the P-CSCF in a specific network, and directly connected to the I-CSCF in the IMS domain.

The present invention is a method for a mobile terminal in non-packet mode to access multimedia services. Using the above-mentioned network structure, the UE accesses the IMS system through a wireless access network, and a mobile user access agent unit (MAUA) is set in the network. );

When the UE initially accesses the mobile network, the MAUA initiates a registration request to the IMS domain instead of the UE, and registers the UE to the IMS domain;

When the UE initiates a service request, the MAUA initiates a session request to the IMS domain instead of the UE, and performs call follow-up processing according to the response of the IMS domain;

When a call needs to be connected to the UE, the MAUA receives the session request from the IMS domain instead of the UE, and performs paging and connection to the UE on the wireless access network.

Let's look at a few specific call examples.

Example 1. Registration process:

As shown in Figure 6, under the network structure of the present invention, the signaling flowchart of the method of the present invention is used to initiate a location update request when the user terminal is turned on, and mainly includes the following steps:

S11, the user turns on the phone, and initiates a location update request; the request message contains a user identification parameter and an update type parameter; wherein the user identification is an International Mobile Subscriber Identity (IMSI), and the update type is assigned as "user power on";

S12. The base station system (BS) sends a location update request to the MAUA;

S13. The MAUA maps the parameters in the location update request message to the header fields and parameters in the SIP registration message, constructs a SIP registration message, and sends it to the P-CSCF in the IMS domain;

S14. After receiving the registration request, the P-CSCF finds the user's home domain according to the user's IMSI number segment, and sends the registration message to the I-CSCF of the user's home IMS domain;

S15. The I-CSCF obtains the associated S-CSCF address of the user from the HSS;

S16. The I-CSCF forwards the registration message to the corresponding S-CSCF;

S17. The S-CSCF detects that the registration message does not contain authentication parameters, and then applies to the HSS for parameters required for the authentication process;

S18. The S-CSCF selects required authentication parameters, such as authentication random numbers, from the authentication data returned by the HSS;

S19. The S-CSCF returns a 401 Unauthorized (non-authentication) response message to the I-CSCF, which includes the authentication random number (the CK/IK parameters in the usual IMS authentication process are not included, because the CAVE algorithm cannot obtain these parameters) ;

S110. The I-CSCF forwards the 401 Unauthorized response message to the P-CSCF;

S111. The P/I-CSCF forwards the 401 Unauthorized response message to the MAUA;

S112. After receiving the 401Unauthorized response message, the MAUA constructs an authentication request message and sends it to the wireless access network to which the user belongs, and carries the authentication random number brought by the 401Unauthorized response message in the authentication request message; the authentication request message An authentication request message that can be recognized by a non-IMS terminal may be a unique query request message (Unique Challenge) based on CDMA IOS (Interoperability Specification; Interoperability Specification) signaling;

S113. The wireless access network forwards the received authentication request message to the non-IMS user terminal to request authentication;

S114. After receiving the authentication request message, the non-IMS user terminal uses the received authentication random number to perform an authentication operation, and returns the calculated authentication result to the BS through an authentication response message;

S115. The BS sends the received authentication response message to the MAUA;

S116. After receiving the authentication response message, the MAUA initiates SIP registration to the P-CSCF again, and this registration message contains an authentication result parameter;

S117. The P-CSCF forwards the registration message with the authentication result to the I-CSCF;

S118. The I-CSCF obtains the associated S-CSCF address of the user from the HSS;

S119. The I-CSCF forwards the registration message to the corresponding S-CSCF;

S120. After receiving the registration message with the authentication result, the S-CSCF compares the authentication result with the authentication result calculated by the HSS (or circuit domain HLR), and if they match, the authentication passes;

S121, after the authentication is passed, the S-CSCF will report to the HSS that the authentication has passed and download the user data; the HSS needs to carry the user's MDN (Mobile Directory Number, mobile directory number) data in the returned message;

S122. The S-CSCF sends a 200OK response to the I-CSCF, and the response contains the user's MDN parameter;

S123. The I-CSCF forwards the 200 OK response to the P-CSCF;

S124. The P/I-CSCF transmits the 200 OK response to the MAUA;

S125. After receiving the 200OK response, the MAUA returns a location update acceptance response to the non-IMS mobile terminal, and simultaneously saves the received MDN data in the user data set retained by itself;

S126. The non-IMS mobile terminal receives the location update acceptance message, and the registration and authentication process is all completed.

Example 2, calling process:

As shown in Figure 7, under the network structure of the present invention, the user terminal initiates the calling process and adopts the signaling flow chart of the method of the present invention, mainly including the following steps:

S21. The terminal sends an initial call process, and the access network sends the initial call message to the MAUA;

S22. The MAUA applies for media resources from the media gateway;

S23. After the media gateway allocates the media resources, it returns the information to the MAUA.;

S24. The MAUA initiates a channel assignment process to the access network;

S25. The access network establishes a service channel on the calling side, and returns a response to the MAUA;

S26. The MAUA initiates a SIP session establishment request to the IMS domain;

Steps S27--S218 are standard IMS session establishment procedures;

S219. The MAUA applies to the media gateway for changing the bearer;

S220. The media gateway modifies the bearer according to the instruction;

S221. The MAUA instructs the access network to modify the bearer;

S222. The access network modifies the bearer according to the instruction;

S23. Notify the MAUA after the IMS domain is connected to the called party;

S24. The MAUA returns a connection response.

Example 3. Called process:

As shown in Figure 8, under the network structure of the present invention, the user terminal is used as the called party, and the signaling flow chart adopting the method of the present invention mainly includes the following steps:

S31. The calling side initiates a SIP session establishment request to the called network;

These steps of S32-S34 are the normal IMS session transfer process, and finally the session is transferred to the called MAUA;

S35. The MAUA first applies for media resources SDP-1 and SDP-2 from the media gateway;

S36. The media gateway allocates the media resource and returns it to the MAUA;

S37. The MAUA initiates a paging process to the called user;

S38. The called terminal returns a paging response;

S39. The MAUA initiates a channel establishment assignment process to the called user;

S310. The access network returns the media information on the access side;

S311. The MAUA returns the media resource information of the media gateway to the IMS network;

S312——S319 is a common IMS domain call signaling process;

S320. The MAUA updates the bearer information on the media gateway;

S321. The media gateway updates the bearer according to the instruction;

S322. The called user answers the call;

S323. The MAUA updates the bearer on the access network side;

S324. The access network updates the bearer according to the instruction;

S325. The MAUA returns a connection indication to the IMS domain;

S326. The IMS domain returns a response.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (10)

1. A network for non-packet mode mobile terminals to access multimedia services, including: Radio access network RAN, used to access mobile users; The IP Multimedia Subsystem IMS provides multimedia services for the mobile users; The media gateway is used to control the conversion between the circuit domain bearer and the IP multimedia subsystem IMS domain bearer; It is characterized in that it also includes: The mobile user access agent unit MAUA communicates with the wireless access network and the media gateway, and connects the mobile user to the IP multimedia subsystem IMS through the wireless access network, replacing the mobile user to the IP multimedia subsystem. The system IMS domain initiates a registration request to register the mobile user with the IP Multimedia Subsystem IMS domain. 2. network as claimed in claim 1, is characterized in that, described mobile user access agent unit MAUA, comprises: The radio access network RAN signaling processing unit is used to process signaling with the radio access network RAN; The IP Multimedia Subsystem IMS signaling processing unit is used to process signaling with the IP Multimedia Subsystem IMS; The media gateway MGW signaling processing unit is used to process signaling with the media gateway MGW; The radio access network RAN signaling and IP multimedia subsystem IMS signaling bidirectional conversion unit is used for bidirectional conversion of radio access network RAN signaling and IP multimedia subsystem IMS signaling. 3. the network as claimed in claim 2, is characterized in that, described mobile user access agent unit MAUA, also comprises charging interface unit, is used for reporting the access stratum to IP Multimedia Subsystem IMS domain charging entity Charging information and provides information for the IP Multimedia Subsystem IMS domain to associate it with service layer charging. 4. The network according to claim 1, wherein the radio access network (RAN) can be a time division multiplexing TDM bearer or an IP bearer. 5. The network according to claim 1, wherein the communication between the mobile user access agent unit MAUA and the media gateway MGW is through H.248 protocol. 6. A network for non-packet mode mobile terminals to access multimedia services, including: Radio access network RAN, used to access mobile users; The IP Multimedia Subsystem IMS provides multimedia services for the mobile users; It is characterized in that it also includes: The mobile user access agent unit MAUA communicates with the radio access network RAN, and connects the mobile user to the IP multimedia subsystem IMS through the radio access network RAN, replacing the mobile user to the IP multimedia subsystem The IMS domain initiates a registration request to register the mobile user with the IP Multimedia Subsystem IMS domain. 7. network as claimed in claim 6, is characterized in that, described mobile user access agent unit MAUA, comprises: The radio access network RAN signaling processing unit is used to process signaling with the radio access network RAN; The IP Multimedia Subsystem IMS signaling processing unit is used to process signaling with the IP Multimedia Subsystem IMS; The radio access network RAN signaling and IP multimedia subsystem IMS signaling bidirectional conversion unit is used for bidirectional conversion of radio access network RAN signaling and IP multimedia subsystem IMS signaling. 8. The network according to claim 7, wherein said mobile user access agent unit MAUA also includes a charging interface unit for processing mobile user charging information. 9. The network according to claim 6, wherein the RAN can be a time division multiplexing TDM bearer or an IP bearer. 10. A kind of method for the mobile terminal access multimedia service of non-packet mode, mobile user accesses to IP Multimedia Subsystem IMS by wireless access network, it is characterized in that: A mobile user access agent unit MAUA is set in the network. When a mobile user initially accesses the mobile network, the mobile user access agent unit MAUA initiates a registration request to the IP Multimedia Subsystem IMS domain instead of the mobile user, and sends the mobile user Register to the IP Multimedia Subsystem IMS domain; When a mobile user initiates a service request, the mobile user access agent unit MAUA initiates a session request to the IP Multimedia Subsystem IMS domain instead of the mobile user, and performs subsequent call processing according to the response of the IP Multimedia Subsystem IMS domain; When a call needs to be connected to a mobile user, the mobile user access agent unit MAUA receives the session request from the IP Multimedia Subsystem IMS domain instead of the mobile user, and performs paging and connection to the mobile user on the radio access network RAN.

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