CN106790055A - A kind of register method and device of IMS systems - Google Patents

Abstract

A kind of register method and device of IMS systems.Device includes user equipment (UE), transmitting element, receiving unit, authenticating unit and registering unit；The present invention is otherwise varied with original IMS registration method, and in the present invention, when registered events occur, the network equipment is required for an access certificate to each user, can so mitigate the pressure of server.These certificates by lain in less than in the network equipment or figure come an interface produce.When a customized condition is met, the network equipment just sends one and notifies that, to enabler, enabler is reinformed to user.Because with P CSCF, S CSCF also have HSS be connected, we invent the network equipment appear much like a user.The network equipment is connected by interface Gm with P CSCF, using the Session Initiation Protocol in this interface can between user equipment also has conversation control function server transmission information.

Description

A kind of register method and device of IMS systems

Technical field

The invention belongs to IP multimedia subsystem technical field, more particularly to a kind of register method of IMS systems and dress Put.

Background technology

IMS (IP multimedia subsystem) is the fusion of various cellular network technologies, and it can make the people Anywhere can Instant messaging is carried out, video conference is participated in, is sent Email.IMS is the core element of third generation networks framework, and it can be carried For most of Internet services.For example, it can make a people log in the webpage that he likes with any terminal device, postal is read Part, viewing film or participation video conference.

Fusion with packet-switch technology and circuit-switched technology turns into trend, and the main target of IMS is exactly to utilize this Mobile device is accessed internet by the technology of kind.Its another target is to create one to provide the flat of various multimedia services Platform, and expand the service range of mobile phone packet switching network technology.Various multimedia service agreements are included in IMS, such as meeting Words control protocol, session initiation protocol (SIP).IMS frameworks are the set of the standard interface comprising various functions.

Figure 1A is the basic frame structure figure of existing IMS.This is a set of most popular standard, this set at present that 3GPP is proposed Standard has carried out detailed description to global system for mobile communications.In figure, packet of the IMS mobile terminal 1s 40 in such as GPRS Communicated using wireless base station 138 in network 136.Some other key node of IMS network is also illustrated in figure.These sections Point includes that one or more are called the customer data base of home signature user server (HSS) 120 and signing position functions clothes Business device SLFS 122.The sip server 116,118 using user conversation control protocol (CSCFS) is also illustrated in figure.In figure also There are multiple sip application servers 108.126 and 128 is Media Resource Function Processor MRF, MRF by MRFCs126 and MRFPs128 is constituted, respectively presentation medium resouce controller and media resource processor.Breakout Gateway Control Function device (BGCFs) 124 is substantially a sip server being routed according to telephone number, and control is sent to PSTN Or the calling from PSTN (PSTN).BGCF is mainly and realizes call routing function, for selecting and PSTN/ The connected network of CS domains point of penetration, receives the request of S-CSCF, is the appropriate PSTN point of interfaces of calling selection next time.Figure 1A In, PSTN gateway is made up of SGW (SGW) 130, Media Gateway Controller (MGCF) 132 and WMG (MGW) 134. Business datum comprising all registered users in HSS, the positional information of these data including user, security information, user award The authentication information of power information and IMS to user.The sip server for realizing user conversation control function is important in IMS Node, it be used for process SIP signalings.As shown in Figure 1A, CSCF can be divided into three types according to function.P-CSCF106A is IMS accesses the unified entrance of network.It is all that originate from IMS terminal and terminate at the conversation message of IMS terminal will be by P- CSCF.From the viewpoint of Session Initiation Protocol, P-CSCF106A, 106B is considered as a proxy server of SIP, it means that institute The conversation message for originating from IMS terminal 140,102 and terminating at IMS terminal will be by P-CSCF.P-CSCF forwardings SIP please Ask and forward the response to suitable user equipment 140,102 or IMS network.In user registration course IMS terminal only with Same P-CCSCF communication, therefore when a registration request is initiated, P-CSCF can only distribute to an IMS terminal, and Will not become in registration process.P-CSCF is used for ensuring security comprising many functions, such as it can set up substantial amounts of internet Security protocol (IPsec) carries out security association with IMS terminal, and these IPsec are used for ensuring to change after message establishing Become.Once P-CSCF completes mandate to user, P-CSCF just confirms user identity in remaining network node, so other Network node avoid the need for continuing to confirm user that so they can just continue as user's offer and individual service and produce use The accounts information at family.P-CSCF is also used for judging the correctness of the SIP request that IMS terminal sends, and prevents IMS terminal from producing and is not inconsistent Close the request of Session Initiation Protocol rule.Each P-CSCF can serve multiple IMS terminals, and certain IMS terminal will be in certain number In limitation.

IMS network also uses I-CSCF (118), and this is a proxy server of SIP, is usually located at the side of management domain Edge.S-CSCF (116) is in core status in IMS network session control, and it is the Centroid of signaling, is substantially one Sip server.S-CSCF also shows certain control function, because it can also maintain as a Register of SIP The IP address and sip address of user are the contact between (public user identity PUID).In registration process, I-CSCF is by looking into HSS is ask, is that user selects a S-CSCF.In calling procedure, the calling towards IMS network is first routed to I-CSCF, by I-CSCF obtains the S-CSCF addresses that user is registered from HSS, then routes messages to S-CSCF.S-CSCF receives to come from P- The registration request that CSCF forwardings come, coordinating with HSS carries out subscription authentication, and the business datum of contracted user is downloaded from HSS.S- CSCF carries out routing management to user's active call or called, according to contracted user's initial filter criteria (iFC), and then triggers Sip application server, realizes abundant IMS business functions.

SIP-AS is a local application server, for performing the IP multimedia services based on Session Initiation Protocol.OSA-SCS 110 is professional ability application server, is connected with the network equipment using OSA api interfaces.OSA-SCS inherits the big portion of OSA The ability of dividing, especially enters the ability of IMS network from external network connection, and on the one hand it show as application server, on the one hand Again can be as OSA and the interface of external application.IM-SSF (118) is a special application server, and it utilizes one GSM in individual mobile phone terminal application enhancing IMS.

SGW SGWs connect No.7 signaling networks, and with interconnecting for IP network, it mainly completes PSTN/ISDN sides The translation function of No.7 signalings and IP sides signaling.SGW is responsible for protocol conversion between layers, such as the MTP of low layer is assisted View is converted into Stream Control Transmission Protocol.Media gateway controller MGC F is the Centroid of PSTN gateway, and it utilizes a State Transformer Carry out the conversion of agreement and communicated with various WMGs, terminal and network using various protocols, these agreements include SIP, ISUP and VICC.Media gateway MGW is a unit for connection different type network, perform disparate networks such as PSTN it Between conversion.On the other hand, MGW can send or receive video by RTP (RTP) in IMS.When IMS terminal not When supporting SCI yards, MGW may also be used for carrying out code conversion.

The process that user accesses IMS systems is described in detail below, because some current IMS registration modes have very big lacking Fall into, related supplemental has been carried out to it, the register flow path of IMS is as follows：

Step one, user equipment (UE) must produce an IMS entity when registration request is sent, and this step is called agency and exhales Cry the control stage.

Step 2, before registration process, user equipment (UE) needs to take user subject from entity set.One S-CSCF quilt Distribute to user equipment and be authorized to and form corresponding secure relationship.

Step 3, downloads a user file in S-CSCF in HSS, in this process, Session Initiation Protocol is initialized And public user identity PUID is transmitted in the dark.The registration packet of IMS contains two stages, and first stage mainly includes the network of IMS How to send request to user equipment, second stage describe user equipment how response to network request and complete whole Registration process.

Step 4, user equipment 140,102 sends a SIP request to P-CSCF 106A, 106B, may bag in request Containing an information entity for representing cell name and user address.

Step 5, P-CSCF now start to process registration requests, and according to the cell name resolution I-CSCF for providing 118 IP address.I-CSCF correspondingly gets in touch with HSS 120, and parsing HSS can select the maximum capacity of S-CSCF 116.

Step 6, after HSS have selected S-CSCF, I-CSCF forwards forward registration request to S-CSCF, S-CSCF hairs If existing user is not authorized to, authorization message is just extracted from HSS, and be sent to the response of user " 401 ", represent user Mandate is not obtained.

Step 7, when user equipment starts first request of parsing, P-CSCF now have received second request again, connect May proceed to repeat the first step process, when S-CSCF have received response after, if information is true, will be from HSS under User profile is carried, and sends the message of one " 200 " and represented and ask successfully.

Step 8, once user equipment is authorized to successfully, it is possible to initialization and received message.The responsibility of user equipment it One is to be continuously updated log-on message, if user equipment does not update log-on message, then S-CSCF will will be registered specifically As once slipping up and remove it.When user equipment is nullified from IMS, registration timer is just designated as 0 and one is sent Information through registering.

In sum, above-mentioned basic IMS is accessed and there is also some problems.First, all of registration and unregistration must be Carried out in fixed user device address, this can bring some problems, such as the aging generation problem of user equipment causes registration not Can carry out or be registered in interaction to interrupt.The application of the privately owned id of user brings service portable in licensing process Property problem, the privately owned id of user associates equipment and user, has good effect for man-to-man this method of operation, such as Say mobile phone etc..But for one-to-many operation, i.e. only one of which equipment but there is the registration process of multiple users, such as In a fixed telephone network for office, different landline telephones needs do not conversed temporarily in the same time, existing IMS access procedures do not have this function.

The content of the invention

In order to solve the above problems, it is an object of the invention to provide a kind of register method and device of IMS systems.

In order to achieve the above object, the register method of the IMS systems that the present invention is provided includes the following step for carrying out in order Suddenly：

Step 1, user equipment (UE) send SIP registration and ask to P-CSCF, in this request comprising one need by The user identifier of registration；

Step 2, P-CSCF are processed this registration request, and this request is sent into I-CSCF；

This registration request can be dealt into registration manager by step 3, I-CSCF before S-CSCF addresses are inquired about from HSS； After the network equipment receives notice, user can be input into its user profile on webpage and be registered；The network equipment is used as registration Agency, registration message is transmitted to S-CSCF and HSS, can give user distribute a private user identity；

Step 4, afterwards I-CSCF can send Cx interface query messages to HSS, the address for inquiring about S-CSCF；

After step 5, HSS selections S-CSCF, the address of S-CSCF is directly issued by Cx interface query response message I-CSCF；

Step 6, be determined the address of S-CSCF after, SIP registration request can be transmitted to S-CSCF, S-CSCF by I-CSCF Cx interface user authentication information can be sent from HSS；

Step 7, HSS will authenticate the authentication information for obtaining and return to S-CSCF by Cx interface Authentication Response information；

If step 8, S-CSCF have found that user is not authorized to, authorization message is just extracted from HSS, and be sent to use The response at family " 401 ", represents user and does not obtain mandate；

Step 9, when user equipment start parsing first request when, P-CSCF now again have received second request, connect The process of several steps before repeating；

Step 10, when S-CSCF have received response after, if information is true, user profile will be downloaded from HSS, And the message of transmission one " 200 " is represented and asked successfully；

Step 11, S-CSCF select user profile using the public user identity PUID in header file or IMS message In a service framework produce initial service；Once user equipment is authorized to successfully, it can just be initialized and receiving disappears Breath；

Step 12, registration timer when user equipment is nullified from IMS, be just designated as 0 and send one to have registered The information crossed；

Step 13, after this succeeds in registration, user equipment can receive the message " 200OK " from S-CSCF, represent Complete whole registration process；Do not registered before a user, then its public user identity PUID there is currently no, S-CSCF will be processed by HSS and specifically register and distribute a public user identity PUID to user, if before user Through registering, as long as selecting a public user identity PUID and current user-association from S-CSCF.

The IMS system registry devices of the use above method that the present invention is provided include：User equipment (UE), transmitting element, connect Receive unit, authenticating unit and registering unit；Wherein,

User equipment (UE)：It is mainly used to as the terminal device for accessing IMS systems, is accessed using wireless device or hardware and set It is standby；

Transmitting element：For according to S-CSCF addresses, the registration message being transmitted directly into S-CSCF；Registration now disappears Public user identity PUID can be included in breath, after authenticating successfully, may proceed to send the response of " 200 "；When authenticating unit authentication During success, send that Cx interface is pushed on or Cx interface is popped message to HSS；

Receiving unit：The public user identity of the user equipment (UE) is distributed to for receiving each Service Access point PUID, and receive the P-CSCF discovery lists of the corresponding access point feedback of each business；Receiving unit is also used for receiving authentication list During unit's success, the Cx interface returned when sending Cx interface authentication information to HSS is responded；

Registration management unit：This element is registration manager, can be as public user identity PUID from server The agency of registration and unregistration；One since the registration notification that enabler sends represents whole registration, user can be in net Its user profile is input on page to be registered；Registration manager as registration agency, by registration message be transmitted to S-CSCF and HSS, they can authorize to user's one private user identity of distribution and to it；

Authenticating unit：For authenticating user equipment (UE), judge whether to assign this user's registration authority；

Registering unit：After authenticating successfully, i.e., when user equipment (UE) receives the response of " 200 ", IMS systems are in this element Carry out initial registration process.

The register method of the IMS systems that the present invention is provided is otherwise varied with original IMS registration method with device, in this hair In bright, when registered events occur, the network equipment is required for an access certificate to each user, can so mitigate server Pressure.These certificates by lain in less than in the network equipment or figure come an interface produce.It is customized when meeting one During condition, the network equipment just sends one and notifies that, to enabler, enabler is reinformed to user.Because with P-CSCF, S-CSCF Also HSS is connected, and the network equipment that we invent appears much like a user.The network equipment passes through interface Gm and P-CSCF phases Even, using the Session Initiation Protocol in this interface can between user equipment also has conversation control function server transmission information.

Brief description of the drawings

Figure 1A is the IMS system basic frame structure figures of prior art.

The IMS system basic frame structure figures that Figure 1B is provided for the present invention.

Fig. 2 is the IMS system access method flow charts of the P-CSCF sides of prior art；

Fig. 3 is the IMS system access method flow charts of the S-CSCF sides of prior art；

The register method flow chart of the IMS systems that Fig. 4 is provided for the present invention；

The register device structural representation of the IMS systems that Fig. 5 is provided for the present invention；

Specific embodiment

We discuss various implementation methods of the invention, the IMS system bases that Figure 1B is provided for the present invention from details below This frame construction drawing.General IMS architecture includes three levels：Transfer layer, Internet, application layer.Registration proposed by the present invention Manager is at application layer therein, and overall framework includes two Hes of terminal 152 registered using P-CSCF (150A 150B) 153.P-CSCF represents that agent call controls the function in stage, and it can be by one as sip server or agency, for producing Signal in raw IMS systems.So two sip agents of 150A and 150B are first communication sections of IMS systems and user terminal Point.P-CSCF can be deployed in public network as proxy server, or when public network can not be accessed, it is also possible to dispose In home network.User terminal passes through dynamic host allocation protocol (DHCP) or GPRS (GPRS) and P- CSCF is connected.P-CSCF can also carry out registering communication between S-CSCF (158).S-CSCF is a control for being in application layer Node processed, it is also a sip server, but its major function is session control.It is deployed among home network simultaneously And be connected with home subscriber server HSS 160 by Cx interface or Dx, for downloading or upload user file.S-CSCF Also there are other some functions, such as process SIP registration, the address of user bound and the sip address of itself, check each Individual message simultaneously determines for sip message which application server (162 164 166) be transmitted to.In figure 170 represent registration interface Management (IRM), it provides log-on message to P-CSCF and S-CSCF.

As shown in Figure 1B, some other interfaces are connected with IRM.First, user network equipment 174 (both can be wired Can also be wireless) or other COM1 be connected with IRM by network interface 172.In figure 176 represent an enable Device, it is in fact a software, and various applications can be accessed by corresponding interface, and each application can be obtained from enabler Win the confidence breath.For example, user can get announcement information by enabler from the network equipment, any one user can use Message can be obtained by enabler.As shown in FIG., application server 162 can also change registration by interface 163 Behavior.

Otherwise varied with original IMS registration, in the present invention, when registered events occur, the network equipment is to each user An access certificate is required for, can so mitigate the pressure of server.These certificates are by no exhibition in the network equipment or figure Reveal the interface for coming to produce.When a customized condition is met, the network equipment just sends one and notifies to enabler, Enabler is reinformed to user.Because with P-CSCF, S-CSCF also have HSS be connected, the network equipment of the invention is appeared much like One user.The network equipment is connected by interface Gm with P-CSCF, can be in user equipment using the Session Initiation Protocol in this interface Also transmission information between conversation control function server.In figure 178 represent gateway SGW.In figure 180 are one makes Interface between energy device and user equipment, the communication mechanism by IMS system protocols or correlation of this interface is operated.

The technical scheme that the embodiment of the present invention is proposed, although can to a certain extent increase hour of log-on, but it is sacrificing User is set to obtain bigger power to make decision on the basis of hour of log-on, user can freely select note by registration manager The pin time, when " move " instruction is input into registration manager, can also be registered in one place, be noted in different places Pin, it is possible thereby to make the registration process of IMS more facilitate.

Technical scheme provided in an embodiment of the present invention is illustrated below in conjunction with the accompanying drawings.

Referring to Fig. 2, a kind of IP multimedia subsystem IMS registration method provided in an embodiment of the present invention is received in P-CSCF After the registration message comprising unauthorized response sent to user equipment (UE), the method includes：

201, P-CSCF determine I-CSCF addresses；

202, determine after I-CSCF addresses, registration message is transmitted into registration manager, and user manages by registration The setting of device is managed, after being packed to log-on message, then log-on message I-CSCF is transmitted to；

203, the I-CSCF addresses that S-CSCF is inquired about using HSS.

Accordingly, in S-CSCF sides, referring to Fig. 3, a kind of IP multimedia subsystem IMS registration provided in an embodiment of the present invention Method includes：

301, S-CSCF, according to the public user identity of the user equipment included in registration request, download to HSS requests and use Family authentication vector；

302, HSS according to the public user identity of the user equipment, generates the subscription authentication vector, and feed back to institute State S-CSCF；

303, S-CSCF after the subscription authentication vector is received, by the I-CSCF and the P-CSCF to described User equipment returns to authentication challenge.

As shown in figure 4, the register method of the IMS systems of present invention offer includes the following steps for carrying out in order：

Step 1, user equipment (UE) send SIP registration and ask to P-CSCF, in this request comprising one need by The user identifier of registration；

Step 2, P-CSCF are processed this registration request, and this request is sent into I-CSCF；

This registration request can be dealt into registration manager by step 3, I-CSCF before S-CSCF addresses are inquired about from HSS； Registration manager is a network interface, its agency for functioning as all registration and unregistrations.The network equipment can be as public affairs Common user identifies the agency of PUID registration and unregistrations from server.One registration notification sent from enabler represents entirely The beginning of registration, after the network equipment receives notice, user can be input into its user profile on webpage and be registered.Network sets The standby agency as registration, S-CSCF and HSS are transmitted to by registration message, can distribute a private user identity to user；

Step 4, afterwards I-CSCF can send Cx interface query messages to HSS, the address for inquiring about S-CSCF；

After step 5, HSS selections S-CSCF, the address of S-CSCF is directly issued by Cx interface query response message I-CSCF, this step need not again by registration manager；

Step 6, be determined the address of S-CSCF after, SIP registration request can be transmitted to S-CSCF, S-CSCF by I-CSCF Cx interface user authentication information can be sent from HSS；

Step 7, HSS will authenticate the authentication information for obtaining and return to S-CSCF by Cx interface Authentication Response information；

If step 8, S-CSCF have found that user is not authorized to, authorization message is just extracted from HSS, and be sent to use The response at family " 401 ", represents user and does not obtain mandate；

Step 9, when user equipment start parsing first request when, P-CSCF now again have received second request, connect The process of several steps before repeating；

Step 10, when S-CSCF have received response after, if information is true, user profile will be downloaded from HSS, And the message of transmission one " 200 " is represented and asked successfully；

Step 11, S-CSCF select user profile using the public user identity PUID in header file or IMS message In a service framework produce initial service；Once user equipment is authorized to successfully, it can just be initialized and receiving disappears Breath；One of responsibility of user equipment is to be continuously updated log-on message, if user equipment does not update log-on message, then S- CSCF will will specifically be registered to treat as and once be slipped up and remove it；

Step 12, registration timer when user equipment is nullified from IMS, be just designated as 0 and send one to have registered The information crossed.

Step 13, after this succeeds in registration, user equipment can receive the message " 200OK " from S-CSCF, represent Complete whole registration process；Do not registered before a user, then its public user identity PUID there is currently no, S-CSCF will be processed by HSS and specifically register and distribute a public user identity PUID to user, if before user Through registering, as long as selecting a public user identity PUID and current user-association from S-CSCF.

As shown in figure 5, in P-CSCF sides, the IMS system registry devices that the present invention is provided include：User equipment (UE), transmission Unit, receiving unit, authenticating unit and registering unit；Wherein,

User equipment (UE)：It is mainly used to, as the terminal device for accessing IMS systems, using wireless device such as mobile phone, or adopt Use hardware access device, such as laptop computer, desktop computer.

Transmitting element：For according to S-CSCF addresses, the registration message being transmitted directly into S-CSCF.Registration now disappears Public user identity PUID can be included in breath, after authenticating successfully, may proceed to send the response of " 200 ".When authenticating unit authentication During success, send that Cx interface is pushed on or Cx interface is popped message to HSS；

Receiving unit：The public user identity of the user equipment (UE) is distributed to for receiving each Service Access point PUID, and receive the P-CSCF discovery lists of the corresponding access point feedback of each business；Receiving unit is also used for receiving authentication list During unit's success, the Cx interface returned when sending Cx interface authentication information to HSS is responded.

Registration management unit：This element is registration manager, can be as public user identity PUID from server The agency of registration and unregistration；One since the registration notification that enabler sends represents whole registration, user can be in net Its user profile is input on page to be registered；Registration manager as registration agency, by registration message be transmitted to S-CSCF and HSS, they can authorize to user's one private user identity of distribution and to it；

Authenticating unit：For authenticating user equipment (UE), judge whether to assign this user's registration authority；

Registering unit：After authenticating successfully, i.e., when user equipment (UE) receives the response of " 200 ", IMS systems are in this element Carry out initial registration process.

The preferred embodiments of the present invention are the foregoing is only, is not intended to limit the invention, for the skill of this area For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair Change, equivalent, improvement etc., should be included within the scope of the present invention.

Claims (2)

1. a kind of register method of IMS systems, it is characterised in that：The register method of described IMS systems includes carrying out in order The following steps：

Step 1, user equipment (UE) send a SIP registration and ask to P-CSCF, are registered comprising a needs in this request User identifier；

Step 2, P-CSCF are processed this registration request, and this request is sent into I-CSCF；

This registration request can be dealt into registration manager by step 3, I-CSCF before S-CSCF addresses are inquired about from HSS；Network After equipment receives notice, user can be input into its user profile on webpage and be registered；The network equipment is used as the generation registered Reason, S-CSCF and HSS are transmitted to by registration message, can distribute a private user identity to user；

Step 4, afterwards I-CSCF can send Cx interface query messages to HSS, the address for inquiring about S-CSCF；

After step 5, HSS selections S-CSCF, I- is directly issued into the address of S-CSCF by Cx interface query response message CSCF；

Step 6, be determined the address of S-CSCF after, SIP registration request can be transmitted to S-CSCF by I-CSCF, and S-CSCF can be from Cx interface user authentication information is sent in HSS；

Step 7, HSS will authenticate the authentication information for obtaining and return to S-CSCF by Cx interface Authentication Response information；

If step 8, S-CSCF have found that user is not authorized to, authorization message is just extracted from HSS, and be sent to user The response of " 401 ", represents user and does not obtain mandate；

Step 9, when user equipment start parsing first request when, P-CSCF now again have received second request, then can The process of several steps before repeating；

Step 10, when S-CSCF have received response after, if information is true, user profile will be downloaded from HSS, concurrently Send the message of one " 200 " to represent to ask successfully；

Step 11, S-CSCF are selected in user profile using the public user identity PUID in header file or IMS message One service framework produces initial service；Once user equipment is authorized to successfully, it can just be initialized and received message；

Step 12, registration timer when user equipment is nullified from IMS, be just designated as 0 and send one to be already registered for Information；

Step 13, after this succeeds in registration, user equipment can receive the message " 200OK " from S-CSCF, represent and complete Whole registration process；Do not registered before a user, then its public user identity PUID there is currently no, S- CSCF will be processed by HSS and specifically register and distribute a public user identity PUID to user, if before user Registered, as long as selecting a public user identity PUID and current user-association from S-CSCF.

2. a kind of IMS system registry devices using method as claimed in claim 1, it is characterised in that：Described IMS systems note List device includes：User equipment (UE), transmitting element, receiving unit, authenticating unit and registering unit；Wherein,

User equipment (UE)：It is mainly used to as the terminal device for accessing IMS systems, using wireless device or hardware access device；

Transmitting element：For according to S-CSCF addresses, the registration message being transmitted directly into S-CSCF；In registration message now Public user identity PUID can be included, after authenticating successfully, may proceed to send the response of " 200 "；When authenticating unit is authenticated successfully When, send that Cx interface is pushed on or Cx interface is popped message to HSS；

Receiving unit：The public user identity PUID of the user equipment (UE) is distributed to for receiving each Service Access point, and The P-CSCF for receiving the corresponding access point feedback of each business has found list；Receiving unit is also used for receiving authenticating unit success When, the Cx interface returned when sending Cx interface authentication information to HSS is responded；

Registration management unit：This element is registration manager, can be registered from server as public user identity PUID With the agency for nullifying；One since the registration notification that enabler sends represents whole registration, user can be on webpage Its user profile is input into be registered；Registration message is transmitted to S-CSCF and HSS by registration manager as the agency of registration, They can authorize to user's one private user identity of distribution and to it；

Authenticating unit：For authenticating user equipment (UE), judge whether to assign this user's registration authority；

Registering unit：After authenticating successfully, i.e., when user equipment (UE) receives the response of " 200 ", IMS systems are carried out in this element Initial registration process.