CN102547651A

CN102547651A - User roaming method and ICS (internet connection sharing) enhanced network

Info

Publication number: CN102547651A
Application number: CN2010105882607A
Authority: CN
Inventors: 陶全军; 郝振武; 吴建华
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2010-12-14
Filing date: 2010-12-14
Publication date: 2012-07-04
Anticipated expiration: 2030-12-14
Also published as: CN102547651B; WO2012079451A1

Abstract

The invention discloses a user roaming method. A BPF (Berkeley packet filter) is added to an ICS (internet connection sharing) enhanced network. The method includes: an mAGCF (mobile access gateway control function) receives call of UE (user equipment) of non-ICS enhanced network to set up request messages and then sends conversation invitation messages to the BPF; the BPF triggers third-party service control through L-iFC (local initial filter control) and transmits the received conversation inviting messages to an L-TAS (local telephony application server); and the L-TAS triggers CS (circuit switching) service control after receiving the conversation inviting messages and serves as an agency of the UE to set up a conversation with an opposite terminal after the triggering is complete. The invention further discloses the ICS enhanced network. Accessing of the UE of the non-ICS enhanced network to the ICS enhanced network is realized, communication service for the UE of the non-ICS enhanced network is realized, and accordingly compatibility of the UE of the non-ICS enhanced network to the ICS enhanced network is further realized, and services of a CS region can be realized based on an IMS (internet protocol multimedia subsystem).

Description

User's loaming method and ICS strengthen network

Technical field

The present invention relates at IP Multimedia System (IMS; IP Multimedia Subsystem) roaming technology in the network architecture; Relate in particular to a kind of user's loaming method and ICS and strengthen network based on IMS centralized traffic (ICS, IMS Centralized Service).

Background technology

Network interconnection agreement (IP; Internet Protoco1) IP multimedia subsystem, IMS (IMS; IP MultimediaCore Network Subsystem) be a kind of IP-based network framework that is proposed by third generation partner program (3GPP, 3rd GenerationPartnership Project), it has made up an opening and service environment flexibly; Support multimedia application, and abundant multimedia service is provided for the user.

IMS and access technology are irrelevant; Can be GPRS (GPRS; General PacketRadio Service), WLAN (WLAN; Wireless Local Area Network) etc. (PS, the Packet Switching) access network that divides into groups provides outside the business, can also be global system for mobile communications (GSM; Global System for Mobile communications), unify mobile communcations system mobile cellular networks such as (UMTS, UniversalMobile Telecommunications System) and provide professional.

Mobile network such as GSM, UMTS adopts circuit-switched technology, and (CS, CircuitSwitched) territory can provide basic speech business for the user, and based on the supplementary service of speech business to be called circuit.When IMS was inserted in the CS territory, it developed into a kind of access way, and business provides by IMS is unified fully, and this technology is called IMS centralized traffic (ICS, IMS Centralized Service).

Fig. 1 is the professional Organization Chart of IMS centralized control, and is as shown in Figure 1, comprising: subscriber equipment (UE; User Equipment) 101, global system for mobile communications wireless access network (UTRAN, Universal MobileTelecommunication S ystem Radio Acces s Network)/GS M EDGE wireless access network (GERAN; GSM EDGE Radio Access Network) 102; ICS moves server in the exchange (ICSMSC Server, ICS Mobile Switch Center Server) 103, circuit domain WMG (CS-MGW; CS Media Gateway) 104; Home subscriber server (HSS, Home Subscriber Server) 105, call conversation control function entity (CSCF; Call Session Control Function) 106 and telco application server (TAS, Telephony Application Server) 107; Wherein,

UTRAN/GERAN 102, are used for being responsible for Radio Resource access control and management;

ICS MSC Server 103; Except the access of accomplishing the CS subscriber equipment, mobile management, the CCF; Also serve as session initiation protocol (SIP; Session Initiation Protoco1) user agent realizes the conversion between CS signaling and the sip message, replaces the user to insert IMS.

CS-MGW 104, are used to be responsible for providing media resource, and media resource is managed and controlled;

HSS 105, are used to preserve user's subscription data, for calling out or session provides support.

CSCF 106 further is divided into inquiry CSCF (I-CSCF, Interrogating CSCF) and service (S-CSCF, Serving CSCF).I-CSCF and HSS carry out alternately, and request HSS distributes S-CSCF for the user, or the residing S-CSCF of inquiring user; S-CSCF provides functions such as registration, calling control for the user.

TAS 107, are used for being responsible for handling traditional C territory telephone service.

UE 101 is linked into ICS MSC Server 103 through CS control signaling; ICS MSC Server serves as the user agent; Replaced C S subscriber equipment 101 inserts the CSCF 104 of IMS network; And set up session connection with remote subscriber, simultaneously ICS MSC Server 103 control CS-MGW 104 accomplish Media Stream and the conversion between the Media Stream in the IP carrying in the CS carryings, set up subscriber equipment 101 and are connected with medium between remote subscriber.

Angle from network development; Core net finally develops into the unified management by IMS, and by the industry approval, 3GPP has formulated the ICS technology in version 8; Through MSC Server enhancing the IMS network is arrived in the CS network insertion, this is the key technology of a kind of CS network to the evolution of IMS network.But existing ICS technology is not considered and is reduced ICS MSC cost; Prior standard only is on traditional mobile switching centre (MSC, Mobile Switch Center) basis, to strengthen, and supports the ICS service trigger; And in fact; If uniform service is moved to the IMS network, then ICS MSC just can simplify, to reduce the core network cost.

For this reason, industry proposes a kind of ICS and strengthens the network architecture, and with reduction MSC Server function, S compares with traditional IC, and solution CS network thoroughly sinks to Access Layer, and network configuration is fairly simple like this, is no longer dependent on CS Core and Signaling System Number 7 net.

Fig. 2 strengthens network architecture sketch map for ICS, and is as shown in Figure 2, on the basis of structure shown in Figure 1, comprises following newly-increased network element:

Mobile Access Gateway controlled function entity (mAGCF; Mobile Access Gate ControlFunction) 203; Distinctive points between mAGCF203 and the ICS MSC Server 104 is that mainly mAGCF mainly provides the conversion of the signaling between CS and the SIP; No longer have access-in management and the service control function of traditional C territory MSC Server to the user; Also cancelled and the internetwork interface of traditional C simultaneously, the intercommunication between mAGCF203 and the traditional C network realizes through the MGCF entity (MGCF, Media Gate Control Function) of IMS network.

Fig. 3 strengthens professional register flow path figure for ICS, and as shown in Figure 3, UE is linked into the IMS network through mAGCF, initiates registration at the IMS network.For brevity, the flow process emphasis among Fig. 3 has been described the position updating process and the IMS registration process in CS territory, and has ignored safety certification process wherein.

ICS strengthens registration process and may further comprise the steps:

Step 301～step 302; UE initiates the CS attaching process at the CS access network; Send the CS position updating request to ICS MSC Server, carry the international mobile subscriber identity (IMSI, International Mobile Subscriber Identification Number) of UE in the message;

Step 303; ICS MSC Server converts the location update request message of receiving into the SIP registration message; Obtain the user attaching domain name according to identify label IMSI; Send registration message to UE home domain IMS Web portal network element I-CSCF, carry the private user identity of deriving according to the IMSI of UE by ICS MSC Server (PVI, Private User Identity) in the registration message.

Step 304, I-CSCF receives registration message, to HSS inquiry and registration state, carries the PVI of UE in the message.HSS searches the current UE login state according to the PVI of UE, if the S-CSCF address of UE with registration then returned in heavily registration, if registration first, HSS selects a S-CSCF address or returns a S-CSCF capabilities list;

Step 305, if HSS returns is the S-CSCF address information, then I-CSCF transmits login request message to this S-CSCF, if the S-CSCF capabilities list that HSS returns, then I-CSCF selects the S-CSCF that ability meets, and transmits login request message to it;

Step 306, S-CSCF receives login request message, may trigger authorizing procedure, for for simplicity, wouldn't too much describe here;

Step 307, S-CSCF obtains the customer service subscription data to HSS;

Step 308, S-CSCF returns the message that succeeds in registration to mAGCF, carries available public subscriber identification (PUI, Public User Identity) tabulation and the default PUI of UE in the message;

Step 309, mAGCF preserves S-CFCF address and ID tabulation and default PUI, and upgrades success message to the UE home position;

In the ICS enhancement techniques, the MSC function is weakened, and no longer has service processing function; Only be responsible for protocol conversion and resource management work, service trigger all focuses on ownership IMS core network with control, and for traditional C netsurfing mechanism; Professional control and triggering are handled by visit ground MSC; Like this according to existing ICS enhancement techniques, in the time of in the network that causes the legacy user to roam into describing in the background technology, can't trigger business.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of user's loaming method and ICS to strengthen network, and it is compatible to the communication service of other mobile network users to realize that ICS strengthens network.

For achieving the above object, technical scheme of the present invention is achieved in that

A kind of user's loaming method is characterized in that, strengthens in the network at ICS and sets up marginal agent functionality network element (BPF, Bounds Proxy Function); Said method comprises:

MAGCF receives after non-ICS strengthens the call setup request message of UE of network, sends session invitation message to marginal agent functionality network element BPF;

Said BPF is through local inceptive filtering control (L-iFC; Local Initial Filter Control) triggers the professional control of third party; And the session invitation message that is received is transmitted to local call application server (L-TAS, Local Telephony Application Server);

After the session invitation message that said L-TAS receives, the professional control in circuits for triggering exchange (CS, Circuit Switching) territory, and is triggering successfully the back as the agency of said UE, the session of foundation and opposite end.

Preferably, said mAGCF also comprises before BPF sends session invitation message:

Said mAGCF confirms whether said UE is registered; If session invitation message is sent in the registered BPF address that then when registration, is obtained; Mobile subscriber's international number (MSISDN, Mobile Subscriber International ISDN) information of the said UE that obtains when carrying registration in the said session invitation message; If unregistered then refusal is called out.

Preferably, said method also comprises:

Said BPF generates said L-iFC when said UE registers.

Preferably, said BPF generates said L-iFC and is specially:

Said BPF confirms purpose L-TAS, is application server among the L-iFC (AS, Application Server) address parameter with determined purpose L-TAS address setting, and definite L-iFC service trigger incident and respective logic.

Preferably, said BPF is specially through local inceptive filtering control:

Said BPF searches the log-on message of said UE according to the calling number in the session invitation message that is received, and triggers the third party according to the L-iFC in the said log-on message and control;

Said BPF matees service trigger incident and the respective logic of said L-iFC, and session invitation message is transmitted in the L-TAS address of in L-iFC, carrying during coupling.

Preferably, said method also comprises:

After said L-TAS receives session invitation message, preserve the session information in the said session invitation message; Said session information comprises at least a of following information: rear subscriber number, called number, session identification, conversation media relevant information.

Preferably, said L-TAS is as the agency of said UE, and the session that is established to the opposite end is specially:

The new initiation session of said L-TAS, and transmit said session information, carry out related with the session that receives before the session of newly initiating.

A kind of ICS strengthens network, comprises mAGCF, BPF and L-TAS; Wherein,

MAGCF is used for behind the call setup request message of the UE that receives non-ICS enhancing network, sending session invitation message to BPF;

BPF is used for triggering the professional control of third party through L-iFC, and the session invitation message that is received is transmitted to L-TAS;

L-TAS after the session invitation message that is used to receive, triggers the professional control of CS, and is triggering successfully the back as the agency of said UE, the session of foundation and opposite end.

Preferably; Said mAGCF confirms further whether said UE is registered before BPF sends session invitation message, if session invitation message is sent in the registered BPF address that then when registration, is obtained; The MSISDN information of the said UE that obtains when wherein, carrying registration in the said session invitation message; If unregistered then refusal is called out.

Preferably, when said BPF registers at said UE, generate said L-iFC; Particularly; Said BPF confirms purpose L-TAS, is application server AS address parameter among the L-iFC with determined purpose L-TAS address setting, and definite L-iFC service trigger incident and respective logic.

Preferably, said BPF further searches the log-on message of said UE according to the calling number in the session invitation message that is received, and triggers third party's control according to the L-iFC in the said log-on message;

Preferably, said L-TAS preserves the session information in the said session invitation message after receiving session invitation message; Wherein, said session information comprises at least a of following information: rear subscriber number, called number, session identification, conversation media relevant information.

Preferably, said L-TAS is further after triggering that CS is professional and control successfully, and new initiation session, and transmit said session information is carried out related with the session that receives before the session of initiation newly.

Among the present invention; When non-ICS enhancing network UE roams in the ICS enhancing network, because ICS strengthens network and prior mobile network and incompatible, therefore; For the UE that roams into ICS enhancing network; Because UE can not be implemented to the registration that ICS strengthens network, therefore, UE also just can not enjoy ICS and strengthen the communication service that network provides.The present invention is through being provided with BPF, when mAGCF receives after non-ICS strengthens the call setup request message of UE of network, confirms the BPF that inserts immediately, and sends session invitation message to this BPF; Said BPF triggers the professional control of third party through L-iFC, and the session invitation message that is received is transmitted to L-TAS, triggers the professional control of CS by L-TAS, and is triggering successfully the back as the agency of said UE, the session of foundation and opposite end.Like this, promptly realize strengthening the UE that the non-ICS of network insertion strengthens network, realize non-ICS is strengthened the communication service of the UE of network by ICS.The present invention has realized that ICS strengthens network to the compatibility that non-ICS strengthens the UE of network, also can realize the business in CS territory based on IMS.

Description of drawings

Fig. 1 is the professional Organization Chart of IMS centralized control;

Fig. 2 strengthens network architecture sketch map for ICS;

Fig. 3 strengthens professional register flow path figure for ICS;

Fig. 4 strengthens network architecture sketch map for ICS of the present invention;

Fig. 5 strengthens network and rises and exhale flow chart for the traditional C user of the embodiment of the invention one roams into ICS;

Fig. 6 strengthens network and rises and exhale flow chart for the traditional C user of the embodiment of the invention two roams into ICS;

Fig. 7 strengthens network and rises and exhale flow chart for the traditional C user of the embodiment of the invention three roams into ICS.

Embodiment

Basic thought of the present invention is, through BPF is set, when mAGCF receives after non-ICS strengthens the call setup request message of UE of network, confirms the BPF that inserts immediately, and sends session invitation message to this BPF; Said BPF triggers the professional control of third party through L-iFC, and the session invitation message that is received is transmitted to L-TAS, triggers the professional control of CS by L-TAS, and is triggering successfully the back as the agency of said UE, the session of foundation and opposite end.

For making the object of the invention, technical scheme and advantage clearer, below lift embodiment and with reference to accompanying drawing, to further explain of the present invention.

Fig. 4 strengthens network architecture sketch map for ICS of the present invention; As shown in Figure 4, strengthen network with existing ICS and compare, ICS of the present invention strengthens network and has increased a BPF newly; In addition; The present invention has also carried out corresponding upgrading to mAGCF, I-CSCF, HSS and L-TAS network element in the ICS enhancing network, has strengthened the corresponding function of these network elements, is specially:

MAGCF is used for when UE adheres to, and whether possess the perception current UE is other network users' ability, when finding that his network users roams into ICS enhancing network, selects suitable BPF to send register requirement;

MAGCF is after receiving the changed course request message of I-CSCF, and mAGCF sends registration message according to redirection address in the message;

MAGCF also possesses and obtains interim identification code (TMSI; Temporary Mobile SubscriberIdentity) ability; When mAGCF receive carry in the location update request message be the temporary identity ID time; Obtain the world of UE and move identify label IMSI, obtain manner comprises following mode:

A, mAGCF obtains to said UE;

B if perhaps mAGCF can identify said TMSI, then obtains to the mAGCF of distribution T MSI according to said TMSI, perhaps obtains through MSC.

I-CSCF; Be used for when receiving login request message; Whether be other network users' ability, when finding that UE roams into ICS enhancing network for his network users, I-CSCF is rerouted to BPF or transmits login request message to BPF through changed course request message notice mAGCF if possessing the perception current UE;

HSS when being used to receive I-CSCF inquiring user login state message, judges when current UE is other network users, returns the indication of user for other network users;

BPF has the protocol conversion ability, after receiving login request message; Preserve log-on message; Obtain the PVI information of the UE in the login request message, and obtain the IMSI of said UE according to the PVI information of UE, said BPF adopts MAP; HLR under said UE sends location update request message, the IMSI information and the BPF address information of carrying UE in the location update request message;

BPF also is used to preserve user data, after receiving said insertion user data requests message, triggers third-party registration, gives local call application server L-TAS with user's signing service data forwarding of being obtained;

Before the BPF triggering third-party registration, generate local inceptive filtering control iFC, comprise the address of L-TAS among the said iFC, the service trigger standard;

BPF also preserves the registered address of mAGCF; Routing number is provided, and after the CS territory roaming number that receives UE provided request message, BPF distributed routing number or obtains routing number through L-TAS;

BPF receives setup requests, according to L-iFC, routes the call to L-TAS;

L-TAS provides routing number, Provides Roaming Number behind the request message when receiving BPF, and L-TAS distributes routing number;

The professional control of CS receives session invitation message, according to the professional control of signatory service trigger.

Below in conjunction with above-mentioned network configuration, further introducing in detail and the present invention is based on ICS enhancing network is how to support traditional C user roaming.

Fig. 5 strengthens network and rises and exhale flow chart for the traditional C user of the embodiment of the invention one roams into ICS; As shown in Figure 5, present embodiment has been described the traditional C user and has been roamed into after ICS strengthens network, and mAGCF receives the call setup request message of UE; The BPF address of binding during according to registration; Send session invitation message to BPF, BPF transmits session invitation message according to the L-iFC of this locality to L-TAS, and L-TAS carries out the professional judgement of CS to user calling.The traditional C user of present embodiment roams into ICS and strengthens network and rise and exhale flow process specifically to may further comprise the steps:

Step 501～step 502; Tradition UE (being that non-ICS strengthens the network user) roams into ICS and strengthens network; Send call setup request message through the CS Radio Access Network; Wherein, carry international mobile subscriber identity (IMSI, International Mobile SubscriberIdentification Number) information and the called number information of UE in the call setup request message;

Step 503; After mAGCF receives the UE call setup request message, adhere to information according to the related original user of User Identity IMSI in the call setup request message, if do not refuse the calling of UE; Then notify UE to adhere to; And the BPF information of binding when adhering to, send session invitation message to the BPF of this binding, carry called number and user's information such as calling number in the session invitation message;

Step 504 after BPF receives session invitation message, is associated with the data field that the original subscriber registers according to the calling number in the session invitation message, the L-iFC that produces when obtaining user's registration information with registration, and wherein L-iFC generates and can comprise following steps:

A.BPF is AS address parameter among the L-iFC according to purpose L-TAS of operation policy selection with selected purpose L-TAS address setting;

B. said BPF confirms L-iFC service trigger incident and correspondent service logic, and the message event that will receive this user all is triggered to L-TAS;

BPF is forwarded to L-TAS according to the address AS address information among the L-iFC with session, carries called number information and user's dialing number information in the session;

Step 505; L-TAS searches the CS subscription data that said user's third-party registration obtains; After searching successfully; The session that receives is carried out business control according to user's CS subscription data, and wherein the CS subscription data comprises supplementary service, supplementary service restriction and the restricted business of operator before and after the user or the like;

If user's current business satisfies the subscription data business need; L-TAS will preserve the session information in the session invitation message, and session information wherein comprises at least a of following information: rear subscriber number, called number, session identification, conversation media relevant information etc.; After having preserved session information, L-TAS newly initiates a session as the user agent, and transmits received session information, carries out related with the session that receives before the session of newly initiating;

Step 506～step 507, L-TAS is transmitted to BPF with session, and BPF routes the call to called Remote end according to the called number in the session;

Step 508～step 509, far-end Remote receives session invitation message, and the invitation that accepts session is returned the indication of 200OK message and is accepted session, and carries Remote end media information in the session;

Step 510～step 511, L-TAS returns to mAGCF with the 200OK information that receives, and sets up mAGCF and is connected with the IP medium of far-end;

Step 512, mAGCF returns the call setup response message to UE, connects UE and is connected with medium between the mAGCF, the mAGCF while also connects UE and is connected with medium between the far-end Remote, thus the time UE and far-end Remote between proper communication.

Fig. 6 strengthens network and rises and exhale flow chart for the traditional C user of the embodiment of the invention two roams into ICS; Present embodiment has been described the traditional C user and has been roamed into after ICS strengthens network; MAGCF receives the call setup request message of UE; Session invitation message is sent to BPF in the BPF address of binding during according to registration, and BPF transmits session invitation message according to the L-iFC of this locality to L-TAS; The scene that L-TAS refusal is called out, the traditional C user of present embodiment roams into ICS and strengthens network and rise and exhale flow process specifically to may further comprise the steps:

Step 601～step 604 is with aforementioned step 501 shown in Figure 5～step 504.

Step 605, L-TAS finds not this user CS subscription data, finds that perhaps the business that this user is contracted by it limits, and L-TAS returns refuse information, and refusal is current professional, sends the SIP refuse information to BPF, carries the Reason For Denial value in the message;

Step 606, BPF returns refuse information to transmitting mAGCF;

Step 607, mAGCF returns call rejection message to UE, carries the Reason For Denial value of bringing from network side in the message.

Fig. 7 strengthens network and rises and exhale flow chart for the traditional C user of the embodiment of the invention three roams into ICS; Present embodiment has been described the traditional C user and has been roamed into ICS when strengthening network, after mAGCF receives the call setup request message of UE, and the BPF address of binding during according to registration; Send session invitation message to BPF; BPF transmits session invitation message according to L-iFC to L-TAS, and L-TAS finds not this user's CS subscription data, obtains the scene of user contracting data to the HLR of user attaching.The traditional C user of present embodiment roams into ICS and strengthens network and rise and exhale flow process specifically to may further comprise the steps:

Step 701～step 704 is with aforementioned step 501 shown in Figure 5～step 504.

Step 705 after L-TAS receives session invitation message, is obtained user's CS subscription data.Concrete, can obtain user's CS subscription data according to the mode of following step 705a, also can obtain user's CS subscription data according to the mode shown in the following step 705b to 705d.

Step 705a is after L-TAS receives session invitation message, according to the calling number in the session invitation message; Do not find this user's CS subscription data; L-TAS obtains user data according to user's calling number to the HLR of user ascription area, and is concrete; Send the request message that obtains user data to the HLR of user ascription area, obtain in the request message of user data and carry Subscriber Number; HLR searches user CS subscription data according to Subscriber Number after receiving the request message that obtains user data, and user's subscription data is returned to L-TAS;

Step 705b, L-TAS send to BPF and trigger the third-party registration indication again;

After step 705c, BPF receive the third-party registration indication, judge whether this locality preserves the up-to-date CS business datum of user, if do not have, then BPF sends location update request message to the HLR of user ascription area, obtains user data information;

Step 705d, BPF send third-party registration message to L-TAS after receiving the user data that the HLR of user ascription area returns, and carry user CS subscription data information in the third-party registration message.

Step 706～step 713, with step 505 step 512 shown in aforementioned Fig. 5, concrete executive mode is said referring to preamble, repeats no more here.

The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.

Claims

1. user's loaming method is characterized in that, strengthens in the network at IMS centralized traffic ICS and sets up marginal agent functionality network element BPF; Said method comprises:

Mobile Access Gateway controlled function entity mAGCF receives after non-ICS strengthens the call setup request message of user equipment (UE) of network, sends session invitation message to BPF;

Said BPF triggers the professional control of third party through local inceptive filtering control L-iFC, and the session invitation message that is received is transmitted to local call application server L-TAS;

After the session invitation message that said L-TAS receives, the professional control of circuits for triggering switching domain CS, and is triggering successfully the back as the agency of said UE, the session of foundation and opposite end.

2. method according to claim 1 is characterized in that, said mAGCF also comprises before BPF sends session invitation message:

Said mAGCF confirms whether said UE is registered, if session invitation message is sent, mobile subscriber's international number MSISDN information of the said UE that obtains when carrying registration in the said session invitation message in the registered BPF address that then when registration, is obtained; If unregistered then refusal is called out.

3. method according to claim 1 is characterized in that, said method also comprises:

Said BPF generates said L-iFC when said UE registers.

4. method according to claim 3 is characterized in that, said BPF generates said L-iFC and is specially:

Said BPF confirms purpose L-TAS, is application server AS address parameter among the L-iFC with determined purpose L-TAS address setting, and definite L-iFC service trigger incident and respective logic.

5. method according to claim 3 is characterized in that, said BPF is specially through local inceptive filtering control:

6. method according to claim 1 is characterized in that, said method also comprises:

7. method according to claim 6 is characterized in that, said L-TAS is as the agency of said UE, and the session that is established to the opposite end is specially:

8. an ICS strengthens network, it is characterized in that, said ICS strengthens network and comprises mAGCF, BPF and L-TAS; Wherein,

9. ICS according to claim 8 strengthens network; It is characterized in that; Said mAGCF confirms further whether said UE is registered before BPF sends session invitation message, if session invitation message is sent in the registered BPF address that then when registration, is obtained; The MSISDN information of the said UE that obtains when wherein, carrying registration in the said session invitation message; If unregistered then refusal is called out.

10. ICS according to claim 8 strengthens network; It is characterized in that, when said BPF registers at said UE, generate said L-iFC; Particularly; Said BPF confirms purpose L-TAS, is application server AS address parameter among the L-iFC with determined purpose L-TAS address setting, and definite L-iFC service trigger incident and respective logic.

11. ICS according to claim 10 strengthens network, it is characterized in that said BPF further searches the log-on message of said UE according to the calling number in the session invitation message that is received, and triggers third party's control according to the L-iFC in the said log-on message;

12. ICS according to claim 8 strengthens network, it is characterized in that said L-TAS preserves the session information in the said session invitation message after receiving session invitation message; Wherein, said session information comprises at least a of following information: rear subscriber number, called number, session identification, conversation media relevant information.

13. ICS according to claim 12 strengthens network, it is characterized in that, said L-TAS is further after triggering that CS is professional and control successfully, and new initiation session, and transmit said session information is carried out related with the session that receives before the session of initiation newly.