CN1716965A - Multimedia system - Google Patents

Abstract

The invention discloses an IP multimedia system, which includes an IP multimedia processing unit for processing user network access control, call/session control and service processing, and further includes: a home user server, the home user server is independent of the bearer network The functional entity, including the IP processing interface related to the IP multimedia processing unit, is used to record the relevant user information and service information required by the IP multimedia processing unit to support the functions of the IP multimedia system, so as to cooperate with the IP multimedia processing The unit completes the user's network access control, call/session control and service processing. In the IMS multimedia system provided by the present invention, the HSS only includes IMS functions, and divides the non-IMS functions, so as to provide general IMS access to different bearer networks.

Description

IP multimedia system

technical field

The invention relates to the technical field of communication, in particular to an IP multimedia system applicable to various communication bearer networks.

Background technique

With the development of mobile communication technology, traditional voice communication services can no longer meet people's communication needs, and people urgently need to experience brand-new multimedia services. The multimedia services are not just simple video and audio communication services, but also include instant messaging, co-location browsing, collaborative work, streaming media and other services, especially services that integrate new communication methods and traditional voice communication.

At present, in view of the trend of the integration of the Internet and the telecommunication network, the International Organization for Standardization's 3rd Generation Partnership Project (3GPP, The 3rd Generation Partnership Project) has introduced the IP multimedia service network architecture of the all-IP service network supporting multimedia services on the basis of the packet bearer network. Subsystem (IMS, IPMultimedia Subsystem), the goal of IMS is to shield user access methods according to personalized user data, control the openness of service capabilities, and provide a new multimedia communication experience.

Referring to Figure 1, which is a schematic diagram of IMS entities and interfaces defined by 3GPP at present, the main functional entities in IMS are Call Control Entity (CSCF, Call Session Control Function) and Home Subscriber Server (HSS, Home Subscriber Server).

Among them, there are three types of CSCF: Serving CSCF (S-CSCF, Serving-Call Session Control Function), proxy CSCF (P-CSCF, Proxy-Call Session Control Function), query CSCF (I-CSCF, Interrogating-Call Session Control Function) . P-CSCF is the first contact point of user equipment (UE, User Equipment) in the IMS system, completes the proxy (Proxy) function, accepts the initial session protocol (SIP, Session Initiation Protocol) message and may perform corresponding processing, and then sends it Forward. The I-CSCF mainly completes the function of network hiding. When the user registers, the I-CSCF queries the HSS and determines the S-CSCF serving the user. The S-CSCF records the user's call status and completes the call control function. It is the most important service control entity. Different S-CSCFs can complete different business functions due to the different application servers AS they are connected to.

In addition, the HSS records the user information and service data of each IMS user, cooperates with the CSCF to complete the most important routing functions and roaming functions, and at the same time, the HSS provides authentication, authorization, IMSI/IP address mapping, location positioning functions, etc. Among them, user information includes: user number and address information; security information for authentication and authorization; support for user registration and recording location information between different systems; user characteristic data, etc., business data includes business trigger rules and business trigger logic, etc.

In addition, the IMS system also includes a border gateway control function entity (BGCF, BorderGateway Control Function), a media gateway control function entity (MGCF, Media GatewayControl Function) and an IP multimedia domain media gateway (IM-MGW, IP Multimedia system-Media GateWay ) to complete the intercommunication between IMS and other networks, and the media resource function point (MRFP, Media Resource Function Point) and the media resource control function entity (MRFC, MediaResource Function Control) to realize the media resource function, that is, to provide resources such as playback and conference.

In the current 3GPP network framework and the definition of each functional entity, HSS implements non-IMS functions in addition to IMS functions. IMS functions refer to providing IP multimedia functions to support IMS control functions so that users can use IMS services. The IP multimedia functions are independent It is used to access the access network of IMS; non-IMS functions include the home location register (HLR, Home Location Register) function required by the circuit switching (CS, Circuit Switched) domain and packet switching (PS, Packet Switched) domain, HLR It can be considered as a subset of HSS, supporting PS domain entities such as GPRS Support Node (GSN, GPRS Support Node), allowing users to access PS domain services; supporting CS domain entities such as (G)MSC/(G)MSC server, enabling Users access CS domain services and support roaming with traditional GSM/UMTS CS domain networks.

Referring to FIG. 2 , it is a schematic diagram of logical functions of an HSS in the prior art. The logical functions of the HSS are not divided according to IMS functions and non-IMS functions, that is, both IMS functions and non-IMS functions include these logical functions. In terms of interfaces, C interface is the interface between HSS and GMSC, D interface is the interface between HSS and MSC, Gr interface is the interface between HSS and SGSN, Gc interface is the interface between HSS and GGSN, Sh interface is the interface between HSS and SIP AS , the Si interface is the interface between the HSS and the IM-SSF, and the Cx interface is the interface between the HSS and the CSCF. Among them, the Sh, Si, and Cx interfaces are interfaces related to IMS functions, and the remaining interfaces are interfaces related to non-IMS functions, that is, interfaces related to HLR, which are responsible for functions related to CS and PS domains.

With the development of communication technology, IMS will be applied to other networks other than Universal Mobile Telecommunications Systems (UMTS, Universal Mobile Telecommunications Systems) networks, including wired or wireless, mobile or fixed networks, such as cdma2000 networks and fixed next-generation networks ( NGN, NextGeneration Network). As the functional entity of IMS defined by 3GPP, HSS currently includes IMS functions and non-IMS functions. For different types of networks, the flexibility of bundling IMS functions and non-IMS functions is very poor. For example, for fixed network In the next generation network NGN, user terminals may be connected through fixed network cables. At this time, the HSS only needs the IMS function; for the cdma2000 network, the HSS needs the IMS function and the non-IMS function, but due to the different network types, its non-IMS function part It is different, that is, user information of different types of networks needs to be recorded, and different interfaces with different types of network entities need to be set.

Since non-IMS functions (that is, the HLR part in HSS) are different for different types of networks, for example, for WCDMA networks and CDMA2000 networks, corresponding network interfaces and user information need to be used, and some bearer access networks do not necessarily require HLR function, but only need the IMS function in HSS, such as NGN network. Combining IMS functions and non-IMS functions in one HSS device will make the HSS device not universal for different types of bearer networks, thereby increasing network construction costs.

Contents of the invention

The technical problem solved by the invention is to provide a general IP multimedia system to further adapt to the development of future networks.

In order to solve the above problems, the IP multimedia system of the present invention includes an IP multimedia processing unit for processing user network access control, call/session control and service processing, and also includes:

A home user server, the home user server is a functional entity independent of the bearer network, including an IP processing interface related to the IP multimedia processing unit, used to record the IP multimedia system processing required by the IP multimedia processing unit Function-related user information and service information to cooperate with the IP multimedia processing unit to complete user network access control, call/session control and service processing.

Wherein, the relevant user information supporting IP multimedia system functions includes: IP multimedia user private identifier, IP multimedia user public identifier, IP multimedia user security information, IP multimedia user intersystem location information, and IP multimedia user service quality information.

Wherein, the relevant service information supporting IP multimedia system functions includes: IP multimedia service subscription information, smart service subscription information, and service processing logic.

Wherein, the functions of the IP multimedia system include: IP multimedia system mobility management, IP multimedia system identification processing, generating IP multimedia system user security information, supporting IP multimedia system service authorization, supporting IP multimedia system user security, IP multimedia system access Incoming authorization, support for IP multimedia system service provision, support for IP multimedia system application services, support for IP multimedia system session establishment, and support for intelligent services.

Wherein, the IP multimedia processing unit includes:

The call control unit is used to implement IP multimedia system mobility management, user access authentication, user service authorization, security processing of information encryption and decryption, and call/session control;

The initial session protocol application server unit is used to realize various application business processing;

IP multimedia system service switching function unit, used for external service control point to realize intelligent service;

The IP processing interface includes:

The interface with the call control unit is used for the home subscriber server to transmit user security parameters and user service information to the call control unit; at the same time, it is used for the call control unit to transmit the call control Capability information of the unit, session signaling transmission parameters;

an interface with the initial session protocol application server unit, for the home subscriber server to transfer service-related information and user-related information to the initial session protocol application server; and

The interface with the IP multimedia system service switching function unit is used for the home user server to transfer intelligent service subscription information to the IP multimedia system service switching function unit.

Compared with the prior art, the present invention has the following beneficial effects:

First, the HSS in the IMS multimedia system provided by the present invention only includes IMS functions, and divides non-IMS functions to provide general IMS access to different bearer networks, such as mobile communication networks and fixed network NGN.

Further, the present invention only needs to build a unified IMS network, which can be shared by different access types of networks, and the home location register function related to the bearer can be set according to the specific needs of the access network type, such as UMTS mobile network The HLR function is required, the fixed NGN network may or may not have an independent HLR function, and the WLAN (Wireless Local Access Network) network does not need the HLR function.

Description of drawings

Fig. 1 is the composition schematic diagram of prior art IP multimedia system;

Fig. 2 is a schematic diagram of logical functions of the home subscriber server shown in Fig. 1;

Fig. 3 is the composition schematic diagram of IP multimedia system of the present invention;

FIG. 4 is a schematic diagram of logical function composition of a home user server in the prior art according to IMS functions and non-IMS functions;

Fig. 5 is a schematic diagram of logical functions of the home subscriber server of the present invention shown in Fig. 3;

Fig. 6 is a schematic diagram of logic functions of a home location register integrated with a home subscriber server in the prior art;

Fig. 7 is a schematic diagram of the network principle for implementing IMS in the present invention;

Fig. 8 is a schematic diagram of composition and interface of the IP multimedia system accessed by UMTS of the present invention;

Fig. 9 is a schematic diagram of the composition and interface of the IP multimedia system accessed by CDMA2000 in the present invention.

Detailed ways

In the prior art, IMS integrates IMS functions and non-IMS functions into the HSS, which is not conducive to future network expansion. Therefore, the core of the present invention is to provide a general IMS system that separates IMS functions from bearer networks and can be connected to Into different bearer networks to adapt to future network development and support future all-IP network bearer.

Referring to FIG. 3 , it is a schematic diagram of the composition of the IMS of the present invention. In the IMS of the present invention, only entities related to IMS functions are reserved. As shown in the figure, the IMS of the present invention only includes an IP multimedia processing unit 31 and a home subscriber server 32 that only includes IMS functions. They are described as follows:

The IP multimedia processing unit has the same function as the prior art, and is mainly used to handle user network access control, call/interface control and service processing IP multimedia processing unit, specifically, the multimedia processing unit can be composed of a call control unit , an initial session protocol application server unit, an IP service switching function unit and other multimedia processing resources.

Wherein the call control unit has the same function as the prior art, and is mainly used to implement IP multimedia system mobility management, user access authentication, user service authorization, security processing of encryption and decryption of information, and call/session control;

The initial session protocol application server unit has the same function as the prior art, and is mainly used to realize various application business processing;

The IP service switching function unit has the same function as the prior art, and is mainly used for connecting an external service control point to realize intelligent services.

The home user server 32 realized by the present invention is a functional entity independent of the bearer network, and includes an IP processing interface related to the IP multimedia processing unit 31, which is used for recording the required IP multimedia processing unit processing and supporting IP multimedia Relevant user information and service data information of system functions to support the IP multimedia processing unit 31 to complete relevant user network access control, call/session control processing and service processing.

Wherein, the home subscriber server is provided with an interface with the call control unit, which is used for the home subscriber server to transmit user security parameters and user service information to the call control unit, and is used for the call control unit to send the The home subscriber server transmits the capability information and session signaling transmission parameters of the call control unit.

In addition, the home subscriber server is also provided with an interface with the initial session protocol application server unit, for the home subscriber server to transfer transparent data, including service-related information and user-related information, to the initial session protocol application server.

In addition, the home user server is also provided with an interface with the IP service switching function unit, for the home user server to transfer smart service subscription information to the IP service switching function unit.

Because the home user server 42 of the present invention only realizes the IMS function related to IP multimedia processing, and other non-IMS functions related to the access mode and the bearer network are separated, and each bearer network realizes the relevant non-IMS function of the IMS respectively, therefore , the IMS of the present invention will have versatility, the IMS function and bearer are separated, and can be connected to various IP bearer networks.

The improvement of the present invention is described below by comparing the prior art. First, please refer to FIG. 4, which is a schematic diagram of the logical function composition of the home user server according to IMS functions and non-IMS functions in the prior art. It can be seen from the figure that the prior art includes Indispensable IMS function for multimedia services. This IMS function has nothing to do with the bearer network and is the core function of IMS. In addition, the existing technology also includes non-IMS functions related to the bearer network, that is, the home location register function related to the bearer network , for different bearer networks, the locations and interfaces of the entities that implement the non-IMS functions are different, and for some bearer networks, such non-IMS functions are not even required. Therefore, the IMS in the prior art is not conducive to accessing different IP Bearer network.

The improvement of the present invention is described below, referring to Fig. 5 and Fig. 6, Fig. 5 is a schematic diagram of logical functions supported by the home subscriber server realized by the present invention, and Fig. 6 is a schematic diagram of logical functions of non-IMS functions divided from the existing home subscriber server, In order to realize the access independence of IMS, that is, the separation of IMS and the bearer network, it is necessary to redefine the HSS functional entity and interface of the IMS system, and divide the original HSS entity into two logical functional entities, one of which is retained in IMS to complete the original HSS The IMS function in the HSS; one is stripped from the IMS and becomes a part of the bearer network to complete the non-IMS functions in the original HSS. The separated two functional entities are called HSS' and HLR' respectively.

Please compare and refer to Figure 4 and Figure 5 together. The IMS of the present invention only implements IMS-related logic functions, and the IMS system functions it supports mainly include: IMS mobility management, IMS identification processing, generating IMS user security information, and supporting IMS services Authorization, support for IMS user security, IMS access authorization, support for IMS service provision, support for IMS application services, support for IMS session establishment, and support for intelligent services, etc.

Please refer to Figure 4 and Figure 6 for comparison. The present invention separates the non-IMS functions implemented in the prior art into the bearer network for implementation. The functions supported by the bearer network mainly include: mobility management, identification processing, and generation of user security information. , Support service authorization, support user security, access authorization, support service provision, support application services, support session establishment and support intelligent services, etc.

Since the HSS' records the user information and service data of each IMS user, it cooperates with the CSCF to complete the most important routing function and roaming function. Specifically, the information related to IMS users is as follows: user identification, number and address information; user security information, that is, network access control information for authentication and authorization; user location information, that is, supporting user registration and saving inter-system location information, etc.; user business information and more.

HLR' is located in the bearer network of IMS, not required by any bearer network, and only meaningful to mobile networks, such as GSM/UMTS and cdma2000 networks, HLR' is the HLR defined in these mobile networks. HLR' supports users to access PS domain services; at the same time, supports users to access CS domain services, and supports roaming with traditional CS domain networks. Because the entities and functions defined by different mobile networks are different, the user-related information and interfaces stored by the HLR' conform to the specifications of the IMS bearer network (i.e. different mobile networks) to be specifically determined.

The relevant logical functions of the above-mentioned HLR' are separated into the bearer network, and are realized by the bearer network corresponding to the need for the logical function. The positions and interfaces of HSS' and HLR' are different for different bearer networks, for example, for UMTS network and cdma2000 network , HSS' and HLR' have different positions and interfaces in the network. But for fixed NGN network, or through WLAN network, IMS is carried by IP bearer network, there is no HLR'.

Referring to FIG. 7, it is a schematic diagram of a network in which the IMS system and the bearer network are separated according to the present invention. As shown in the figure, the present invention provides an IMS that is independent of the access method and network type, that is, the user terminal can access through various wireless or wired methods. In the general IMS, the entity of the IMS system is separated from the bearer network. For example, the IMS can access the IMS user terminal through the PS domain bearer network of UMTS, or access the IMS user terminal through the PS domain bearer network of CDMA2000, or the WLAN The IP bearer network accesses the IMS user terminal, and can also access the IMS user terminal through the IP bearer network of the fixed network NGN.

Since the IMS of the present invention only provides IMS-related functions and has nothing to do with the type of access network, it is applicable to bearer networks of various access modes, which is conducive to the access of various IP bearer networks in the future and realizes all-IP network bearer network development trends.

The following will be described with specific embodiments. Referring to FIG. 8, it is a schematic diagram of a UMTS network bearer network. In the figure, only the entity locations and related interfaces related to the improvement of the present invention are shown. As shown in the figure, only the HSS' and The interfaces among SIP AS, IM-SSF, and CSCF are Sh interface, Si interface and Cx interface respectively. The interface between HLR' and MSC (Server), GMSC (Server) is respectively D interface and C interface, and the interface between HLR' and SGSN, GGSN is respectively Gr interface and Gc interface. These interfaces in the figure are completely consistent with the existing interfaces of the 3GPP protocol. The only difference is that HSS' and HLR' are two independent functional entities with different address information. In these network entities that have interfaces with HSS' and HLR', or in equipment such as signaling transfer point STP (Signalling Transfer Point) and domain name server DNS (Domain Name Server) in the No. 7 signaling network, it is necessary to configure or Parse the different address information of HLR' and HSS'.

Referring to FIG. 9 , it is a schematic diagram of a network carried by a cdma2000 network. Similarly, only the locations of entities and related interfaces related to the improvement of the present invention are shown in the figure. As shown in the figure, only HSS' and SIPAS, IM-SSF, and SIPAS that provide IMS functions are provided. The interfaces between CSCFs are Sh interface, Si interface and Cx interface respectively. The interface between HLR' and MSC (Server), GMSC (Server) is ANSI-41 interface. These interfaces in the figure are completely consistent with the existing interfaces of the cdma2000 network. The only difference is that HSS' and HLR' are two independent functional entities with different address information. In these network entities that have interfaces with HSS' and HLR', or in equipment such as signaling transfer points (STP, Signaling Transfer Point) and domain name servers (DNS, Domain Name Server) in the No. 7 signaling network, it is necessary to Configure or resolve the different address information of HLR' and HSS'.

In summary, the present invention completely separates the IMS from the bearer network by defining the HSS' entity of a separate IMS function in the IMS, so that the IMS has universality independent of access and can be applied to IMS user terminals of all access modes. For operators with multiple access networks, a converged IMS can be built to simultaneously access wireless or wired IMS user terminals. In IMS, it is not necessary to distinguish which access method the user uses to access IMS .

For example, if an operator has UMTS mobile network, fixed NGN network and WLAN network at the same time, and these three types of networks all support IMS, then there is no need to establish independent IMS networks in the three types of networks. The IMS network includes HSS ', CSCF, IM-SSF, SIP AS and other equipment to build a unified IMS network means that HSS' can be shared by different access types of networks together with other IMS network equipment. The HLR' is set according to the specific needs of the access network type. For example, a UMTS mobile network requires an HLR', a fixed NGN network may or may not have an independent HLR', and a WLAN network does not need an HLR'.

The above descriptions are only preferred embodiments of the present invention, and do not constitute a limitation to the protection scope of the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (5)

1, a kind of IP multimedia system comprises the IP multimedia processing unit that is used for process user network insertion control, call/session control and Business Processing, it is characterized in that, also comprises:

Home subscriber server, described home subscriber server is the functional entity that is independent of bearer network, comprise and the relevant IP Processing Interface of described IP multimedia processing unit, be used to write down described IP multimedia processing unit processes relevant user information and business information required, that support IP multimedia system function, finish user's network insertion control, call/session control and Business Processing to cooperate described IP multimedia processing unit.

2, IP multimedia system as claimed in claim 1, it is characterized in that the relevant user information of described support IP multimedia system function comprises: the service quality information of positional information, IP media user between IP Multimedia Private Identity, IP media user public identify, IP media user security information, IP media user system.

3, IP multimedia system as claimed in claim 1 is characterized in that, the related service information of described support IP multimedia system function comprises: IP multimedia service CAMEL-Subscription-Information, IN service CAMEL-Subscription-Information, business processing logic.

4, as each described IP multimedia system of claim 1-3, it is characterized in that, described IP multimedia system function comprises: the mobile management of IP multimedia system, IP multimedia system identification process, produce IP multimedia system user security information, support the mandate of IP multimedia system business, support the fail safe of IP multimedia system user, IP multimedia system insertion authority, support the IP multimedia system business to provide, support IP multimedia system applied business, support the session of IP multimedia system to set up, and support IN service.

5, IP multimedia system as claimed in claim 4 is characterized in that, described IP multimedia processing unit comprises:

Call Control Unit is used to realize fail safe processing, the call/session control of the encrypting and decrypting of the mobile management of IP multimedia system, user's access authentication, customer service mandate, information;

The initial session protocol application server element is used to realize various applied business processing;

IP multimedia system business exchange functional unit is used for external service control point to realize IN service;

Described IP Processing Interface comprises:

With the interface of described Call Control Unit, be used for described home subscriber server and transmit user security parameters, user service information to described Call Control Unit; Be used for described Call Control Unit transmits ability information from described Call Control Unit to described home subscriber server, session signaling transmission parameter simultaneously;

With the interface of described initial session protocol application server element, be used for described home subscriber server to described initial session protocol application server business transferring relevant information and user related information; And

With the interface of described IP multimedia system business exchange functional unit, be used for described home subscriber server and transmit the IN service CAMEL-Subscription-Information to described IP multimedia system business exchange functional unit.

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