CN101459894B

CN101459894B - Communication method, system and data center entity for IP multimedia subsystem

Info

Publication number: CN101459894B
Application number: CN2007101792313A
Authority: CN
Inventors: 欧阳聪星; 彭晋; 魏冰; 王晓云
Original assignee: China Mobile Communications Group Co Ltd
Current assignee: China Mobile Communications Group Co Ltd
Priority date: 2007-12-11
Filing date: 2007-12-11
Publication date: 2011-03-02
Anticipated expiration: 2027-12-11
Also published as: CN101459894A

Abstract

The invention relates to a communication method of an IP multimedia subsystem, a system and a data centre entity thereof, wherein the method comprises: receiving session establishment request messages which are sent by an O-UE by an O-DC entity, transmitting the session establishment request messages to a corresponding T-DC entity according to a destination address in the session establishment request messages, searching a corresponding IP address according to a user mark which is carried in the session establishment request messages by the T-DC entity, transmitting the session establishment request messages to a T-UE, transmitting session establishment confirming messages from the T-UE to an O-DC entity, sending the received session establishment confirming messages to the O-UE by the O-DC entity, and finishing session establishment. Compared with an existing IMS structure, the signal interaction flow between network elements when sessions are established is greatly reduced through the method, the system and the data centre entity, and through integrating the logic functions of each network element of an existing IMS into the DC entity, the system complexity is also lowered, which is beneficial for reducing the network establishing and operating cost.

Description

The communication means of IP Multimedia System, system and data centre entity thereof

Technical field

The present invention relates to communication means, system and the data centre entity thereof of IP Multimedia System, belong to the framework technology of IP multimedia communication network.

Background technology

(IP Multimedia Subsystem is called for short: IMS) be that third generation partner program (is called for short: a kind of network architecture of definition 3GPP) IP Multimedia System.IMS is designed to the Multimedia session control system on the packet field network at first, for inserting packet switching (Packet Switch, be called for short: PS) user in territory provides various multimedia services and solves center (IP SolutionCenter by IP, be called for short: ISC) interface, to the control ability of operation layer open network, support open professional control interface.The IMS system be fix, the core key-course of mobile convergence network.

Fig. 1 represents existing IMS system configuration schematic diagram, and Fig. 4 represents the hierarchical diagram of existing IMS.Wherein mainly comprise following functional entity:

CSCF (Call Session Control Function, be called for short: CSCF) entity, be responsible for to customer multi-media session and handle.Can specifically be divided into again according to different functions: proxy CSCF (Proxy-CSCF, be called for short: P-CSCF) entity, be arranged in access domain, be the at first tie point of Access Network to IMS, be mainly used in to transmit and come from subscriber equipment (abbreviation: session initiation protocol UE) (Session Initiation Protocol, abbreviation: SIP) register requirement; Serving CSCF (Serving-CSCF, be called for short: S-CSCF) entity, be arranged in home domain, be the control core of entire I MS, the XM of IMS session management, be used for controlling call and professional correlation behavior, with the application server intercommunication; Inquiry CSCF (Interrogating-CSCF, be called for short: I-CSCF) entity, be arranged in home network, be the entrance from the visited network to the home network, be mainly used in and specify a S-CSCF entity to transmit the SIP request.

(Home Subscriber Server is called for short: be the customer data base system that concentrates HSS), depositing user's authentication information, business information and roaming information etc. home signature user server.HSS is by attaching position register (HLR) and AUC (AUC) evolution, the relevant information of having preserved user file and just by which core network this user having been served now.

(Subscriber Location Function, SLF) entity are simple databases to contracted user's position functions, are used for station address is mapped to the HSS entity.When disposing a plurality of HSS entity in the network, need be configured the SLF entity.

MGCF (Media Gateway Control Function, be called for short: MGCF) entity, be used to control one or more IP multimedia gateway (IP Multimedia-MGW, be called for short: the connection of media channel IM-MGW), select the CSCF entity according to called number and calling situation, to finish the call control protocol conversion between PSTN and the IMS;

(Breakout Gateway Call Function, be called for short: BGCF) entity is mainly used in and realizes calling out route, the network that selection links to each other with telephone network/circuit switching (PSTN/CS) territory cutting point to interrupt the gateway call function.

The media resource function processing (Media Resource Function Process, be called for short: MRFP) entity is used to control the carrying of Mb point, handle media stream, as the conversion of speech coding, Media Stream analysis etc., when Multi-Party Conference, mix the Media Stream of input.

The media resource function controller (Media Resource Function Controller, be called for short: MRFC) entity, be used for controlling the media stream resources of MRFP entity, translation is from the information of application server and S-CSCF entity.

Based on existing IMS system configuration shown in Figure 1, the register flow path of subscriber equipment mainly comprises the steps: as shown in Figure 2

1) user obtains the IP access; 2) the P-CSCF entity to visit ground or ownership place sends registration message; 3) the P-CSCF entity sends to I-CSCF in the user attaching network according to user's domain name with registration message; 4) the I-CSCF entity to the HSS that comprises user data send user-authorization-request (User Authorization Request, be called for short: UAR), request is authorized the user and is distributed suitable S-CSCF; 5) the HSS entity returns user-authorization-answer (User Authorization Answer, abbreviation: UAA), wherein comprise available S-CSCF list of entities; 6) the I-CSCF entity is carried out the S-CSCF entity selection; 7) registration message is sent to selected S-CSCF entity; 8,9) the S-CSCF entity is to HSS entity requests registered user's verify data; 10) the S-CSCF entity comprises information such as random number in No. 401 signaling, initiates authentication to the user, can also realize the authentication of user to network simultaneously; 11,12) I-CSCF and P-CSCF are forwarded to No. 401 signaling on the subscriber equipment; 13,14) user is included in authentication information in the new register requirement after verify data is calculated, and this request is sent to the P-CSCF entity; The P-CSCF entity is given to the I-CSCF entity with this request; 15,16) the I-CSCF entity is to mandate of HSS entity requests and available S-CSCF, and the S-CSCF physical address that the HSS entity will be distributed to the user returns; 17) the I-CSCF entity sends to register requirement the S-CSCF entity of appointment; 18,19,20) after the S-CSCF entity is finished detection to verify data, by No. 200 signaling " OK " notice user registration success.

Based on existing IMS system configuration shown in Figure 1, the session flow process of subscriber equipment mainly comprises the steps: as shown in Figure 3

1,2) the calling part user initiation session is set up request message, and this request arrives calling party S-CSCF entity through the P-CSCF entity; 3) whether calling party S-CSCF entity detection need trigger calling party's business at this session, and correspondingly finishes professional the triggering; 4,5) calling party S-CSCF entity is according to the I-CSCF physical address in callee's address lookup callee user attaching territory; 6) calling party S-CSCF entity is set up the I-CSCF that request message sends to the callee with session; 7,8) callee I-CSCF entity is to the address of HSS entity inquiry for the S-CSCF entity of called subscriber's service; 9) callee I-CSCF entity is set up request message according to the S-CSCF physical address transmission session that the HSS entity returns; 10) callee S-CSCF entity is judged the called service that whether has needs to trigger according to conversation request, and correspondingly finishes the triggering of called service; 11,12) callee S-CSCF entity is transmitted session to the on-site P-CSCF entity of callee user and is set up request message, and the P-CSCF entity is given to the called subscriber with this request; 13-18) callee user's ring sends No. 180 signaling through each CSCF entity to calling part user from callee user; 19-24) callee user's off-hook, callee user sends signaling through each CSCF entity No. 200 to calling part user; Medium are set up; 30-34) supposition calling part user elder generation on-hook, then sending goodbye from calling part user to the called subscriber (is called for short: Bye) request, the P-CSCF entity of Bye request process calling part user and S-CSCF entity and callee user's S-CSCF entity and P-CSCF entity; 35-39) callee user sends the affirmation to off-hook, conversation end.

The defective of prior art is: in the existing IMS structure, session control and professional control all concentrate in the core net, various controlled function are distributed in the different entities according to different levels, make that the foundation of session needs to carry out repeatedly interacting message between the different entities of the entity of different levels and same level, it is very complicated to make session set up process; And the function between the various network element entities is separate, can not backup each other poor reliability.

Summary of the invention

The problem to be solved in the present invention is: the existing IMS structure is simplified, and simplified the corresponding communication flow process.

In order to address the above problem, one embodiment of the present of invention have provided a kind of communication means of IP Multimedia System, comprising:

In the IMS communication system that the data centre entity thereof by a plurality of homogeneities constitutes, calling party's data centre entity thereof receives after session that calling part user equipment sends sets up request message, according to destination address wherein request message is set up in described session and be transmitted to corresponding callee's data centre entity thereof, wherein, the data centre entity thereof of described homogeneity is meant that each data centre entity thereof has same status in the IMS system;

Callee's data centre entity thereof is set up the user ID of carrying in the request message according to described session and is searched corresponding IP address, and according to described IP address, request message is set up in this session sent to callee's subscriber equipment, and the session that will come from callee's subscriber equipment is set up acknowledge message and is transmitted to calling party's data centre entity thereof:

Calling party's data centre entity thereof is set up acknowledge message with the session that receives and is sent to calling part user equipment, sets up to finish session.

In order to address the above problem, another embodiment of the present invention provides a kind of data centre entity thereof, described data centre entity thereof is the data centre entity thereof of homogeneity, be specially: the data centre entity thereof of described homogeneity is meant that each data centre entity thereof has same status in the IMS system, comprising caller unit, called unit and user profile unit, described user profile unit is used to store the log-on message and the signing service information of subscriber equipment;

Described caller unit comprises:

The first caller module is used to receive the session that comes from the transmission of calling part user equipment and sets up request message;

The second caller module is used for according to the destination address that request message is set up in the session that the first caller module receives request message being set up in this session and is transmitted to corresponding callee's data centre entity thereof;

The 3rd caller module is used for that acknowledge message is set up in the session that comes from callee's data centre entity thereof that receives and is transmitted to described calling part user equipment;

Described called unit comprises:

The first called module is used for setting up the user ID that request message carries according to the session that comes from calling party's data centre entity thereof and searches corresponding callee's user device IP address in the user profile unit;

The second called module is used for the described IP address arrived according to the first called module searches, request message is set up in described session sent to callee's subscriber equipment;

The 3rd called module is used for that acknowledge message is set up in the session that comes from callee's subscriber equipment and is transmitted to calling party's data centre entity thereof.

In order to address the above problem, another embodiment of the present invention has provided a kind of communication system of IP Multimedia System, comprising: of the present invention a plurality of based on the distributed hashtable storage means data centre entity thereof of distributed connection each other.

By the present invention, compare with the framework of existing IMS, be integrated in the DC entity, thereby significantly reduced the Signalling exchange flow process between network element when session is set up by the logic function that will have each network element of IMS now, and also reduced the complexity of system, helped reducing networking and operating cost.

Below by drawings and Examples, technical scheme of the present invention is described in further detail.

Description of drawings

Fig. 1 is an existing IMS system configuration schematic diagram;

Fig. 2 is the user equipment registration flow process based on existing IMS system configuration;

Fig. 3 is the subscriber equipment session flow chart based on existing IMS system configuration;

Fig. 4 is the hierarchical diagram of existing IMS;

Fig. 5 A is the flow chart of the communication means of the described IMS of communication means embodiment of the present invention;

Fig. 5 B is for adopting the signaling diagram of method shown in Fig. 5 A;

Fig. 5 C is for adopting another signaling diagram of method shown in Fig. 5 A;

Fig. 5 D is the described T-DC backup entity lookup method flow diagram of searching algorithm based on DHT of communication means embodiment of the present invention;

Fig. 6 A is the flow chart of the register method of the described IMS of register method embodiment of the present invention;

Fig. 6 B is for adopting the signaling diagram of method shown in Fig. 6 A;

Fig. 7 A is the structure chart of the communication system of the described IMS of system embodiment of the present invention;

Fig. 7 B is the internal structure schematic diagram of the described DC entity of system embodiment of the present invention;

Fig. 7 C is the internal structure schematic diagram of caller unit shown in Fig. 7 B;

Fig. 7 D is the internal structure schematic diagram of called unit shown in Fig. 7 B;

Fig. 8 is the distributed connection layout of the described DC backup of system embodiment of the present invention entity;

Fig. 9 is the hierarchical diagram of the IMS system behind the described DC backup of the employing system embodiment of the present invention entity.

Embodiment

Communication means embodiment

Present embodiment provides the communication means of a kind of IMS, shown in Fig. 5 A, comprising:

Step 101, in the IMS communication system that the DC entity by a plurality of homogeneities constitutes, calling part user equipment (Original User Equipment, hereinafter to be referred as: O-UE) (OriginalData Center, be called for short: O-DC) entity sends session and sets up request message to calling party data center.

Wherein, the DC entity of homogeneity is meant that each DC entity does not need to distinguish or ownership place with being in visit in the IMS network, but has same status in the IMS system.It is callee's subscriber equipment (Terminal User Equipment that the destination address that comprises in the request message is set up in this session, hereinafter to be referred as: T-UE) Suo Shu callee data center (Terminal Data Center is hereinafter to be referred as the T-DC) address of entity.In addition, the user ID that also includes T-UE in the request message is set up in this session.

In addition, if O-UE is scheduled to have signing service, then the O-DC entity receives after above-mentioned session sets up request message, the signing service information that can also search this O-UE, and trigger the application corresponding server according to the signing service information that finds and carry out correspondent service logic.Particularly, can in this O-DC entity, search or in corresponding O-DC backup entity, search.For example, the predetermined signing service that calling number screening is arranged of O-UE, then the O-DC entity is not promptly given caller ID display by T-UE according to the calling number screening of this signing service information with this O-UE.

Particularly,, comprise that the log-on message of calling part user equipment and callee's subscriber equipment backs up, before beginning to communicate, can also determine DC backup entity based on the distributed hash table algorithm by the DC entity for to subscriber equipment; The log-on message of subscriber equipment is saved in the DC backup entity that is determined.Concrete definite method can at first be carried out the consistency hash algorithm to the user ID of subscriber equipment, obtains first numerical string; Again first numerical string is carried out modulo operation to the number of DC backup entity and obtain first remainder values that the two is divided by; The DC backup entity that numbering is equaled first remainder values is used to back up log-on message as the DC backup entity that is determined.

In addition, can also determine the log-on message that a plurality of DC backup entities are used for having backed up once more for further raising reliability backs up once more.Concrete definite method can serially add 1 with first numerical value and obtain the second value string; The second value string is carried out modulo operation to the number of DC backup entity obtain second remainder values that the two is divided by; The callee data center backup entity that numbering is equaled second remainder values is used to preserve log-on message as the 2nd DC backup entity that is determined.The rest may be inferred, N-1 numerical value serially added 1 obtain the N numerical string, and wherein, N is the integer greater than 1; The N numerical string is carried out modulo operation to the number of DC backup entity obtain the N remainder values that the two is divided by; The data center's backup entity that numbering is equaled the N remainder values is as N the DC backup entity that is determined.

Need to prove herein, above-mentioned only for convenience of description the backup functionality of DC just the DC entity is called DC backup entity.But in the realization, in fact calling party DC entity, callee DC entity and DC backup entity are the DC entity of homogeneity, and just in different stage of communication, a DC entity can have different functions.

Step 102, the O-DC entity is set up destination address in the request message according to session and request message is set up in this session is transmitted to corresponding T-DC entity.

Particularly, if the above-mentioned purpose address is the IP address of T-DC entity, then can directly transmit; If be domain name addresses, then can according to this domain name addresses domain name system (Domain NameSystem, hereinafter to be referred as: DNS) transmit the IP address of searching this T-DC entity in the server.

In addition, if T-UE is scheduled to have signing service, then the T-DC entity receives after above-mentioned session sets up request message, the signing service information that can also search T-UE, and trigger the application corresponding server according to the signing service information that finds and carry out correspondent service logic.For example, T-UE has been scheduled to Ring Back Tone service in its signing service information, then by application corresponding server coloring ring back tone playing.

Step 103, the T-DC entity is set up the IP address that the user ID of carrying in the request message is searched T-UE according to the session that receives, and according to this IP address, request message is set up in this session sent to T-UE.

Wherein, according to the difference of access way, when T-UE is linked into corresponding T-DC entity time institute IP address allocated, IP address allocated and inequality in the time of may inserting with the last time.Therefore, O-UE possibly can't determine the IP address that this T-UE is current when T-UE initiates a session request, and therefore adopts the mode of user ID to search.

Step 104, T-UE replys session to the T-DC entity and sets up acknowledge message; The T-DC entity is set up acknowledge message with this session and is transmitted to above-mentioned O-DC entity;

Wherein, session is set up acknowledge message and can be signalings such as No. 180 or No. 200 according to prior art.

Shown in Fig. 5 B, the concrete signaling diagram during for the employing said method, three figure places numbering expression signaling of the prior art wherein.In above-mentioned communication process, if fault has taken place callee's T-DC entity, the success of failing is accepted above-mentioned session and is set up request message, then can also continue to carry out following step.

Step 105, O-DC entity judge whether to receive above-mentioned session in the given time and set up acknowledge message, are execution in step 111 then; Otherwise execution in step 112.

Step 111 is set up acknowledge message with this session and is sent to above-mentioned O-UE, sets up to finish session.

Step 112, if this O-DC entity does not receive the session that comes from the T-DC entity in the given time and sets up acknowledge message, illustrate that session do not set up success, then preserve the T-DC backup entity of the log-on message of T-UE, and the session that comes from O-UE that will receive is set up request message and is sent to this T-DC that finds backup entity in step 101 by the O-DC entity lookup.

Wherein, concrete search T-DC backup entity mode can (Distributed Hash Table, be called for short: DHT) algorithm be that keyword is searched with user ID (IMPU) based on distributed hashtable.DHT is a kind of distributed storage method, and it makes each entity be responsible for a route among a small circle respectively under the situation that does not need server, and is responsible for storage sub-fraction data, thereby realizes the addressing and the storage of whole DHT network.Shown in Fig. 5 D, searching T-DC backup entity based on the distributed hash table algorithm can comprise the steps:

Step 112A carries out the consistency hash algorithm to the user ID of T-UE, obtains first numerical string.

Step 112B carries out modulo operation with first numerical string to the number of T-DC backup entity and obtains first remainder values that the two is divided by.

Step 112C, the T-DC center backup entity that numbering is equaled first remainder values is as the T-DC backup entity that finds.

In addition, in order further to improve washability, can continue to carry out following steps.

Step 112D serially adds 1 with first numerical value that obtains among the step 11A and obtains the second value string.

Step 112E carries out modulo operation with the second value string to the number of T-DC backup entity and obtains second remainder values that the two is divided by.

Step 112F, the T-DC backup entity that numbering is equaled second remainder values is as the 2nd T-DC backup entity that finds.

The rest may be inferred, and N-1 numerical value serially adds 1 and obtains the N numerical string, and wherein, N is the integer greater than 1; The N numerical string is carried out modulo operation to the number of T-DC backup entity obtain the N remainder values that the two is divided by; The T-DC backup entity that numbering is equaled the N remainder values is as N the T-DC backup entity that finds.

Search and obtain a plurality of T-DC backup entities by carrying out above-mentioned consistency hash algorithm, can be implemented in distributed store and route in the dynamic network topology, and make each T-DC backup entity only need safeguard the information of a small amount of adjacent entities, and add at entity/when logging off, only have relevant a small amount of entity to participate in the maintenance of topology.

T-DC backup entity receives after this session sets up request message, carries out and the same step of step 103, sets up to realize session.By DC backup entity is set,, thereby help improving the reliability of system even also can not influence Network when having the DC entity to lose efficacy.But need to prove herein,, when this O-DC entity does not receive the session that comes from the T-DC entity when setting up acknowledge message in the given time, send session to same T-DC entity once more and set up request message and also be fine if T-DC backup entity is not set.

Shown in Fig. 5 C,, adopt the concrete signaling diagram of said method for when the T-DC entity breaks down.

From Fig. 5 B, 5C as can be seen, by the described communication means of present embodiment, setting up process with the session of existing IMS shown in Figure 3 compares, be integrated in the DC entity by the logic function that will have each network element of IMS now, thereby significantly reduced the Signalling exchange flow process between network element when session is set up, and also reduced the complexity of system, helped reducing networking and operating cost.

Register method embodiment

Present embodiment provides the register method of a kind of IMS.Because this method all is same being suitable for for O-UE and T-UE, therefore need not UE is carried out above-mentioned differentiation.As shown in Figure 6A, comprising:

Step 201, subscriber equipment (User Equipment, be called for short: (IP Connectivity Access Networks, be called for short: (Data Center, be called for short: DC) entity sends login request message to IAD IP-CAN) to default data center UE) to be communicated with access network by IP.

Wherein, default DC entity is meant geographical position and the belonging network thereof according to UE, the predefined DC entity that service is provided for this UE in IMS.

Step 202, the DC entity authenticates this UE according to the verify data that prestores.

Step 203, after authentication is passed through, the DC entity is the IP address of this UE and the device identification preservation that is associated, and determines DC backup entity based on the distributed hash table algorithm, the log-on message in the described login request message is saved in the described data center backup entity that is determined; Reply registration confirmation message to this UE then, the UE that is used for the notice request registration succeeds in registration.Wherein, the concrete of DC backup entity determines that method can repeat no more referring to the step 1 of communication means embodiment herein.

Step 204, DC entity and DC backup entity upgrade synchronously.Particularly, be that the log-on message that is kept at the corresponding UE in the DC backup entity is upgraded synchronously.

Wherein, DC backup entity being set is in order to improve the reliability of system.But need to prove herein,, promptly it is not carried out being fine with renewal yet if DC backup entity is not set.

Shown in Fig. 6 B, during for the described communication means of employing present embodiment, adoptable concrete signaling diagram, three figure places numbering expression signaling of the prior art wherein.As can be seen from the figure, compare with the registration process of existing IMS shown in Figure 2, be integrated in the DC entity by the logic function that will have each network element of IMS now, thereby significantly reduced the Signalling exchange flow process between the network element in the registration process, and also reduced the complexity of system, helped reducing networking and operating cost.

System embodiment

Present embodiment provides the communication system of a kind of IMS, and shown in Fig. 7 A, the communication system 1 of this IMS comprises: O-DC entity 10 and the O-DC backup entity 19 that is attached thereto; T-DC entity 20 and the T-DC backup entity 29 that is attached thereto.

Wherein, O-DC backup entity 19 and T-DC backup entity 29 all can adopt as shown in Figure 8 a plurality of DC entities and DC backup entity to carry out distributed connection based on the distributed hashtable storage means.Because transmit leg and recipient's connected mode is identical, therefore, O-DC entity 10 among the figure and T-DC entity 20 all can be referred to as the DC entity; O-DC is backed up entity 19 and T-DC backup entity 29 all be referred to as DC backup entity.Particularly, can search corresponding backup entity based on the DHT algorithm, repeat no more herein according to method shown in Fig. 5 D.

In fact above-mentioned O-DC entity 10, T-DC entity 20 and O-DC backup entity 19 and T-DC backup entity 29 are the DC entity of homogeneity, and just in different stage of communication, a DC entity can have different functions.Fig. 7 B represents the internal structure schematic diagram of a DC entity 100.Wherein, DC entity 100 comprises: caller unit 010, called unit 020 and be used to store the log-on message of UE and the user profile unit 030 of signing service information.

Wherein, shown in Fig. 7 C, caller unit 010 comprises: the first caller module, 011, the second caller module 012 and the 3rd caller module 013.Shown in Fig. 7 D, called unit 020 comprises: first called module 021, second called module 022 and the 3rd called module 023.The process that its session is set up is as follows:

The first caller module 011 of the caller unit 010 of O-DC entity 10 receives the session that comes from the O-UE transmission and sets up request message; The session that the second caller module 012 receives according to the first caller module 011 is set up destination address in the request message and request message is set up in this session is transmitted to corresponding T-DC entity 20.

The first called module 021 of the called unit 020 of T-DC entity 20 is set up the user ID of carrying in the request message is searched corresponding T-UE in user profile unit 030 IP address according to the session that comes from O-DC entity 10; The IP address of the T-UE that the second called module 022 finds according to the first called module 021 is set up request message with this session and is sent to T-UE, and T-UE receives that this session is set up and replys session behind the request message and set up acknowledge message; The session that the 3rd called module 023 will come from T-UE is set up acknowledge message and is transmitted to O-DC entity 10.

The session that comes from T-DC entity 20 that the 3rd caller module 013 of the caller unit 010 of O-DC entity 10 will receive is set up the acknowledge message request of being transmitted to and is set up the O-UE of session, sets up to finish session.

In addition, signing service is arranged, then can also comprise in the caller unit 010 of O-DC entity 10: the 4th caller module 014 and the 5th caller module 015 if above-mentioned O-UE is also predetermined.Wherein, the 4th caller module 014 is used for receiving after the session that comes from O-UE sets up request message the signing service information of searching this O-UE when the first caller module 011; The 5th caller module 015 is used for triggering the application corresponding server according to the described signing service information that the 4th caller module 014 finds and carries out correspondent service logic.

Similarly, signing service is arranged, then can also comprise in the called unit 020 of T-DC entity 20: the 4th called module 024 and the 5th called module 025 if above-mentioned T-UE is also predetermined.Wherein, the 4th called module 024 is used for receiving after session sets up request message the signing service information of searching T-UE in user profile unit 030 when the first called module 021; The signing service information that the 5th called module 025 is used for finding according to the 4th called module 024 triggers the application corresponding server and carries out correspondent service logic.

If exist owing to reasons such as T-DC entity 20 break down, fail in time to transmit session and set up the situation that acknowledge message is given O-DC entity 10, then the caller unit 010 of O-DC entity 10 can also comprise: the 6th caller module 016, the seven caller module 017 and the 8th caller module 018.

Wherein, the 6th caller module 016 is used for judging whether to receive the session that comes from T-DC entity 20 in the given time and sets up acknowledge message; The 7th caller module 017 be used for when the judged result of the 6th caller module 016 when not receiving, search the T-DC backup entity 29 of the log-on message of preserving T-UE, concrete search direction can repeat no more referring to Fig. 5 D and related content thereof herein; The 8th caller module 018 is used for that request message is set up in the session that comes from O-UE and sends to the T-DC backup entity 29 that is found by the 7th caller module 017.

In addition, have registering functional to UE in order to make O-DC entity 10 or T-DC entity 20, DC entity 010 can also comprise: authentication ' unit 060 and associative cell 070.Because registration process all is identical for O-UE or T-UE, therefore, below O-UE and T-UE all are referred to as: UE.Concrete registration process is:

Authentication ' unit 060 authenticates this UE according to the verify data that prestores after receiving the login request message that comes from the UE transmission; After the authentication of authentication ' unit 060 was passed through, associative cell 070 was the IP address of this UE and the device identification preservation that is associated, and replied registration confirmation message to this UE.

In addition, in order to improve the reliability of O-DC entity 10 or T-DC entity 20, DC entity 100 can also comprise: backup units 040, be used for being saved in the data center's backup entity that is determined based on the log-on message of the distributed hash table algorithm determining data center backup entity and the login request message that will receive by authentication ' unit 060, concrete definite method can repeat no more referring to the step 101 of communication embodiment herein.Can also comprise lock unit 80 in addition, be used for after associative cell 70 has been replied registration confirmation message, upgrade synchronously with DC backup entity.

As shown in Figure 9, for adopting the hierarchical diagram of the IMS system behind the described DC entity of present embodiment.Operation layer wherein comprises that mainly the IP multimedia is from the service memory platform

(IP-MultimediaSelf-Service Store Platform, be called for short: IM-SSP), sip application server (ApplicationServer, be called for short: AS) and open bussiness access (Open Service Access, be called for short: OSA)/the Parlay interface, be used to provide the miscellaneous service service, carry out service logic.

By the described system of present embodiment, compare with the existing IMS frame structure, be integrated in the DC entity by the logic function that will have each network element entity of IMS now, thereby significantly reduced registration and session and set up the Signalling exchange flow process between the network element in the process, and also reduced the complexity of system, helped reducing networking and operating cost.And, since the DC entity integrated the logic function of multiple single network element entity, therefore, most of logic function can be finished by same DC entity, and the network element entity to specific of not needing to reallocate, thereby helps realizing the equilibrium of load.

It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the spirit and scope of technical solution of the present invention.

Claims

1. the communication means of an IP Multimedia System is characterized in that comprising:

Callee's data centre entity thereof is set up the user ID of carrying in the request message according to described session and is searched corresponding IP address, and according to described IP address, request message is set up in this session sent to callee's subscriber equipment, and the session that will come from callee's subscriber equipment is set up acknowledge message and is transmitted to calling party's data centre entity thereof;

2. the communication means of IP Multimedia System according to claim 1 is characterized in that described calling party's data centre entity thereof receives also to comprise after request message is set up in described session:

Search the signing service information of described calling part user equipment, and trigger the application corresponding server according to the signing service information that finds and carry out correspondent service logic.

3. the communication means of IP Multimedia System according to claim 1 is characterized in that described calling party's data centre entity thereof sets up request message according to described destination address with described session and be transmitted to corresponding callee's data centre entity thereof and comprise:

Described destination address is the domain name addresses of callee's data centre entity thereof, searches corresponding IP address according to this domain name addresses in domain name system server;

According to described IP address, request message is set up in described session sent to callee's data centre entity thereof.

4. the communication means of IP Multimedia System according to claim 1 is characterized in that described callee's data centre entity thereof sets up request message with described session and also comprise before sending to callee's subscriber equipment:

Search the signing service information of described callee's subscriber equipment, and trigger the application corresponding server according to the signing service information that finds and carry out correspondent service logic.

5. the communication means of IP Multimedia System according to claim 1 is characterized in that described calling party's data centre entity thereof receives described session and also comprises before setting up request message:

Based on distributed hash table algorithm determining data center backup entity;

The log-on message of subscriber equipment is saved in the described data center backup entity that is determined.

6. the communication means of IP Multimedia System according to claim 5 is characterized in that described determining data center backup entity comprises:

User ID to subscriber equipment is carried out the consistency hash algorithm, obtains first numerical string;

Described first numerical string is carried out modulo operation to the number of data center backup entity obtain first remainder values that the two is divided by;

The data center's backup entity that numbering is equaled described first remainder values is as first data center backup entity that is determined.

7. the communication means of IP Multimedia System according to claim 6 is characterized in that describedly determining also to comprise after first data center backup entity:

N-1 numerical value is serially added 1 obtain the N numerical string, wherein N is the integer greater than 1;

Described N numerical string is carried out modulo operation to the number of data center backup entity obtain the N remainder values that the two is divided by;

The callee data center backup entity that numbering is equaled described N remainder values is as the N data center backup entity that is determined.

8. the communication means of IP Multimedia System according to claim 7 is characterized in that also comprising:

If described calling party's data centre entity thereof does not receive the session that comes from callee's data centre entity thereof in the given time and sets up acknowledge message, then search the callee data center backup entity of the log-on message of preserving described callee's subscriber equipment;

Request message is set up in described session sent to this callee data center that finds backup entity.

9. the communication means of IP Multimedia System according to claim 8 is characterized in that described calling party's data centre entity thereof searches described callee data center backup entity and comprise:

Search described callee data center backup entity based on the distributed hash table algorithm.

10. the communication means of IP Multimedia System according to claim 9 is characterized in that described calling party's data centre entity thereof searches described callee data center backup entity based on the distributed hash table algorithm and comprise:

User ID to callee's subscriber equipment is carried out the consistency hash algorithm, obtains first numerical string;

Described first numerical string is carried out modulo operation to the number of callee data center backup entity obtain first remainder values that the two is divided by;

The callee data center backup entity that numbering is equaled described first remainder values is as the first callee data center backup entity that finds.

11. the communication means of IP Multimedia System according to claim 10 is characterized in that the described first callee data center backup entity that finds also comprises afterwards:

Described N numerical string is carried out modulo operation to the number of callee data center backup entity obtain the N remainder values that the two is divided by;

The callee data center backup entity that numbering is equaled described N remainder values is as the N callee data center backup entity that finds.

12. the communication means of IP Multimedia System according to claim 1 is characterized in that described calling party's data centre entity thereof receives the session that calling part user equipment sends and sets up before the request message, also comprises:

Subscriber equipment is communicated with access network by IP IAD sends login request message to default data centre entity thereof;

Described data centre entity thereof authenticates described calling part user equipment according to the verify data that prestores:

After authentication is passed through, with described user device IP address and the device identification preservation that is associated, and, the log-on message in the described login request message is saved in the described data center backup entity that is determined based on distributed hash table algorithm determining data center backup entity;

Reply registration confirmation message to described subscriber equipment.

13. the communication means of IP Multimedia System according to claim 12 is characterized in that described data centre entity thereof also comprises after replying described registration confirmation message:

Backing up entity with described data center upgrades synchronously.

14. data centre entity thereof, described data centre entity thereof is the data centre entity thereof of homogeneity, be specially: the data centre entity thereof of described homogeneity is meant that each data centre entity thereof has same status in the IMS system, it is characterized in that comprising caller unit, called unit and user profile unit, wherein

Described user profile unit is used to store the log-on message and the signing service information of subscriber equipment;

Described caller unit comprises:

Described called unit comprises:

15. data centre entity thereof according to claim 14 is characterized in that described caller unit also comprises:

The 4th caller module is used for receiving after described session sets up request message the signing service information of searching this calling part user equipment in described user profile unit when the described first caller module;

The 5th caller module is used for triggering the application corresponding server according to the described signing service information that the 4th caller module searches arrives and carries out correspondent service logic.

16. data centre entity thereof according to claim 14 is characterized in that described caller unit also comprises:

The 6th caller module is used for judging whether to receive the session that comes from callee's data centre entity thereof in the given time and sets up acknowledge message;

The 7th caller module, be used for when the judged result of the 6th caller module when not receiving, search the callee data center backup entity of the log-on message of preserving callee's subscriber equipment based on the distributed hash table algorithm;

The 8th caller module, be used for described session set up request message send to by the 7th caller module searches to callee data center backup entity.

17. data centre entity thereof according to claim 14 is characterized in that described called unit also comprises:

The 4th called module is used for receiving after described session sets up request message the signing service information of searching callee's subscriber equipment in described user profile unit when the described first called module;

The 5th called module is used for triggering the application corresponding server according to the described signing service information that the 4th called module searches arrives and carries out correspondent service logic.

18., it is characterized in that also comprising according to each described data centre entity thereof of claim 14～17:

Authentication ' unit is used for according to the verify data that prestores in the described user profile unit described subscriber equipment being authenticated after receiving the login request message that comes from the subscriber equipment transmission;

Associative cell is used for after the authentication of authentication ' unit is passed through, and with described user device IP address and the device identification preservation that is associated, and replys registration confirmation message.

19. data centre entity thereof according to claim 18 is characterized in that also comprising:

Backup units is used for being saved in the described data center backup entity that is determined based on the log-on message of the distributed hash table algorithm determining data center backup entity and the login request message that will be received by authentication ' unit.

20. data centre entity thereof according to claim 19 is characterized in that also comprising:

Lock unit is used for after associative cell has been replied described registration confirmation message, backs up entity with data center and upgrades synchronously.

21. the communication system of an IP Multimedia System is characterized in that comprising: each are a plurality of based on the distributed hashtable storage means data centre entity thereof of distributed connection each other in the claim 14 to 20.