CN109639717B - Number portability communication method and calling side/called side service control point server - Google Patents
Number portability communication method and calling side/called side service control point server Download PDFInfo
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Abstract
The invention belongs to the technical field of communication networks, and relates to a number portability communication method and a calling side/called side service control point server. The method comprises the following steps: receiving a call invitation message sent by a calling side call session control function entity; judging whether a calling number corresponding to the first terminal and a called number corresponding to the second terminal belong to the same group user; if the calling number and the called number do not belong to the same group user, the calling side service control point server performs domain selection on the called user and inquires the position information of the called user; according to the position information of the called user, the calling side service control point server sends a call invitation information to the calling side call session control function entity, so that the call session control function entity and the telephone number mapping server/domain name system can initiate an inquiry request for inquiring the name authority pointer record of the called number; the calling side call session control function entity routes the call to the interworking network element of the IMS domain and other networks according to the called domain name.
Description
Technical Field
The invention belongs to the technical field of communication networks, and particularly relates to a number portability communication method, a calling side service control point server and a called side service control point server.
Background
With the development of science and technology, terminals (such as mobile phones and the like) become essential articles in life of people. And along with the continuous improvement of the living quality of people, higher requirements are made on the consumption experience.
VoLTE (Voice over LTE, LTE network direct transfer) is a Voice service based on the LTE network data domain of IMS (IP Multimedia Subsystem). IMS consists of all functional entities that can provide multimedia services, enabling operators to offer their subscribers multimedia services based on internet-based applications, services and protocols. The LTE network is an all-IP network, all services are borne on a data domain, and the unification of data and voice services in the same network can be realized.
Network operators (Unicom, Mobile, Telecommunications) enhance the consumer experience of people by enforcing a number portability policy. However, this makes operators not only need to perform technical preparation, database construction, and network modification, add corresponding devices, expand and modify existing devices, but also need to solve the problems of charging, number inquiry, and some management, and these technical implementation all require huge investment and also require a certain amount of time. Although the original Ministry of trust requires the mobile operator to implement the 'take a number and change a package'
However, due to the fact that the capability difference of the support systems is large, the integration of different charging and operation analysis systems has certain difficulty, and the time schedule for comprehensively implementing the policy by many operators is greatly delayed. And because of the huge number of mobile phone users in China, the implementation of number portability will put higher requirements on the performance of the user information database.
In the prior art, a solution that a user of a WVPN (Wireless Virtual Private Network) group carries out number portability and the user opens a VoLTE service and communicates with a user of a heterogeneous group Network is not considered, so how to implement number portability based on the above scenario becomes a problem to be solved urgently.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a number portability communication method, a calling side service control point server and a called side service control point server for overcoming the above disadvantages in the prior art, so as to realize normal communication of a VoLTE user in an IMS domain as a calling and a carrying-out user in different communication domains.
According to an aspect of an embodiment of the present invention, a method for number portability communication is provided, in which a VoLTE user is in an IMS domain as a calling party, and when a carry-out user is a called party, the method includes:
receiving a call invitation message sent by a calling side call session control function entity, wherein the call invitation message is sent to the calling side call session control function entity by a first terminal;
judging whether a calling number corresponding to a first terminal and a called number corresponding to a second terminal belong to the same group user, wherein the second terminal is a VoLTE user;
if the calling number and the called number do not belong to the same group user, the calling side service control point server performs domain selection on the called user and inquires the position information of the called user according to the domain selection result;
according to the position information of the called user, the calling side service control point server sends the call invitation information to the calling side call session control function entity so that the call session control function entity and a telephone number mapping server/domain name system can initiate an inquiry request for inquiring the name authority pointer record of the called number;
and the calling side call session control function entity routes the call to an interworking network element of the IMS domain and other networks according to the name of the called domain.
Preferably, the step of performing domain selection on the called user if the calling number and the called number do not belong to the same group user, and querying the location information of the called user according to the domain selection result includes:
sending a UDR command to a home location register to acquire AVP parameters including a user identifier and a data reference;
the home location register returns AVP parameters including user data to obtain a domain selection result;
according to the domain selection result, sending a UDR command to the home location register to acquire AVP parameters including user identification and data reference;
the home location register returns AVP parameters including user data.
Preferably, when the portable subscriber is in the IMS domain as a called party:
the home location register returns AVP parameters including user data as: IMS-VOICE-OVER-PS-SUPPORTED (1), the said calling side service control point server chooses to inquire about the user information in IMS field;
according to the domain selection result, the calling side service control point server fills out and acquires domain information: PS-Domain (1); and filling in and acquiring node information: 0x01 MME;
the home location register returns AVP parameters including user data as: epsilocationinformation: E-UTROCENTELGloblalD: MCC (3digits) + MNC (2-3digits) + ECI (7digits), E-UTRAN Cell Identity (ECI); and the visited area number is mapped by trackingarea id.
Preferably, when the carrying-out user is in the CS domain as the called party:
the home location register returns AVP parameters including user data as: IMS-VOICE-OVER-PS-NOT-SUPPORTED (0); and IMS-VOICE-OVER-PS-SUPPORT-UNKNOWN (2), the said calling side business control point server chooses to inquire about the user information in CS domain;
according to the domain selection result, the calling side service control point server fills out and acquires domain information: CS-Domain (0);
the home location register returns AVP parameters including user data as: locationinfformation: vlrNumber: VLR NUMBER of the user visit place; cell GlobalidOrServiceAreaIdOrLAI the visited cell information of the user under 2/3G.
Preferably, the domain name corresponding to the called number includes an operator identifier, a province label, and a subscriber number beginning with a routing code.
According to an aspect of an embodiment of the present invention, the present invention provides a calling side service control point server, which includes a receiving module, a determining module, and a domain selecting module, wherein:
a receiving module, configured to receive a call invitation message sent by a calling side call session control function entity, where the call invitation message is sent by a first terminal to the calling side call session control function entity;
the judging module is used for judging whether a calling number corresponding to the first terminal and a called number corresponding to the second terminal belong to the same group user;
and the domain selection module is used for performing message interaction with a home location register to perform domain selection on the called user if the calling number and the called number do not belong to the same group user, and inquiring the location information of the called user according to a domain selection result.
According to an aspect of an embodiment of the present invention, the present invention provides a communication method for number portability, which includes:
receiving an invitation message sent by a called side session call control function entity, wherein the call invitation message is sent to the called side session call control function entity by a calling side session call control function entity;
judging whether a calling number corresponding to the first terminal and a called number corresponding to the second terminal belong to the same group user;
and if the calling number and the called number do not belong to the same group user, performing domain selection on the called user and inquiring the position information of the called user so as to allow the called side session call control function entity to perform message interaction with the called side media gateway control function entity and establish a call route with the second terminal.
Preferably, if the calling number and the called number do not belong to the same group user, the step of the called side service control point server performing domain selection on the called user and querying the location information of the called user includes:
when a carrying-out user is in an IMS domain and serves as a called party, a called side service control point server sends an UDR to a home location register to inquire the location information of the called party, and the home location register returns an UDA;
when the carrying-out user is in the CS domain and is taken as a called party, the called side service control point server sends sh to a home location register to inquire the location information of the called party, and the home location register returns the UDA.
Preferably, when the carrying-out user is in the CS domain as the called party, the called party-side call session control function entity further goes out to the CS domain through the media gateway control function entity to continue the called party according to the domain selection result of the called party-side multimedia telephony application server.
According to an aspect of the embodiments of the present invention, the present invention provides a called side service control point server, which includes a receiving module, a determining module, and a domain selecting module, wherein:
a receiving module, configured to receive a call invitation message sent by a called-side call session control function entity, where the call invitation message is sent by a calling-side call session control function entity to the called-side call session control function entity;
the judging module is used for judging whether a calling number corresponding to the first terminal and a called number corresponding to the second terminal belong to the same group user;
and the domain selection module is used for performing domain selection on the called user and inquiring the position information of the called user if the calling number and the called number do not belong to the same group user, so that the called side session call control function entity performs message interaction with the called side media gateway control function entity, and a call route is established with the second terminal.
The invention has the beneficial effects that:
compared with the prior art, the number portability communication method of the invention comprises the following steps: the method fully considers the condition that a WVPN group user opens a VoLTE service and registers in an IMS domain, and calls a user who is in the IMS domain or a CS domain as another called group network after carrying out number portability, and introduces and inquires domain selection and position information of a called number and name authority pointer records after carrying out number portability on the group user so as to obtain an operator identifier, a province label and a user number starting from a routing code, thereby realizing that a calling side calling session control function entity routes a call to a called side calling session control function entity according to the name of the called domain and interacts with other IMS domain and CS domain network elements to realize the whole process of the call.
Drawings
Fig. 1 is a flowchart of a communication method for number portability in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a service control point server on a calling side in an embodiment of the present invention;
fig. 3 is a flow chart of another exemplary method of communicating in a number portability network in accordance with the present invention;
fig. 4 is a schematic structural diagram of a called-side service control point server in the embodiment of the present invention;
fig. 5 is a signaling diagram of a communication method for number portability in an embodiment of the present invention;
fig. 6A to 6D are schematic diagrams of domain selection and location information of a VoLTE user in an IMS domain as a calling party and a carry-out user in the IMS domain as a called party in the embodiment of the present invention;
fig. 7A to 7D are schematic diagrams of domain selection and location information of a VoLTE user in an IMS domain as a calling party and a carry-out user in a CS domain as a called party in the embodiment of the present invention;
in the drawings, wherein:
11-a first receiving module; 12-a first judgment module; 13-a first domain selection module;
21-a second receiving module; 22-a second judgment module; 23-second field selection module.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the communication method for number portability, the service control point server on the calling side and the service control point server on the called side according to the present invention are further described in detail below with reference to the accompanying drawings and the detailed description.
The invention considers the characteristics of group users and the characteristics of carrying-out users after number portability, solves the problem that a VoLTE user is taken as a called party and another group network user is taken as a calling party in the number portability service of the group users, ensures that the group users can communicate with the users of another group network registered in other domains (such as an IMS domain and a CS domain) when the group users are carried out and registered in the IMS domain, and ensures the normal use of the users of different group networks.
The group Network, i.e. the mobile Virtual Private Network (WVPN) -Wireless Virtual Private Network, provides a logical Private Network to some enterprises, groups, etc. by using the resources of 2/3G/4G Network and fixed Network, so that the enterprises, groups, etc. open services to 2/3G/4G users and PSTN users in the Private Network. The service can give preference to users in a group to a certain degree, and supports flexible numbering function, flexible number display function, flexible dialing mode, closed group user preference, external number group, external calling, flexible control calling, group blocking, user blocking, system dialing forbidding and the like. The WVPN mainly provides cross-provincial V-network services for users in various provinces in the country.
Volte (voice over LTE) is a standard LTE voice solution defined by GSMA and 3GPP, where GSMA mainly makes service and function requirements, and 3GPP mainly makes technical details, such as signaling flow and network function requirements. The core service control network of VoLTE is an IMS (IP multimedia subsystem) network, and is matched with LTE and EPC networks to implement end-to-end voice and video communication services based on packet domains. Through the control of the IMS system, the VoLTE solution can provide voice services and supplementary services thereof with comparable circuit domain performance, including: number display, call forwarding, call waiting, conference calling, etc.
The VoLTE service relates to more and complex environments of network elements, and relates to the circuit domain and the packet domain of the existing network, including the deployment and the construction of LTE, IMS, PCC and other devices.
EPC domain: the EPS network is matched with an IMS system to complete discovery of P-CSCF, establishment of signaling default bearer initially attached, establishment of service special bearers such as voice, video and the like. Voice services are typically provided using a dedicated IMS APN, using QCI-specific bearers for signaling and voice data, the signaling bearer using a default QCI-5 bearer, the voice bearer using a dedicated QCI-1 bearer, and the video bearer using a dedicated QCI-2 bearer.
The PCC mainly combines the P-CSCF (AF function point) and GGSN/P-GW (PCEF function point) to complete the policy control decision and the flow-based charging control functions.
A CS domain: MSC upgrades and supports eSRVCC function, realizes the continuity of VoLTE voice service through Sv interface between the MSC and mobile management entity and Mw/I2 interface between MSC and ATCF or I-CSCF, meets the basic requirement that when the call moves out of LTE coverage area to ensure the continuity of service, the call is smoothly switched to 2G/3G network.
An IMS domain: the method mainly completes functions of call control, service continuity, domain selection and the like. Wherein, the P/I/S-CSCF supports authentication, signaling security protection, signaling compression and the like; the MMTel-AS supports multimedia telephony and supplementary services, including: number display, call forwarding, call waiting, conference call, etc.; an ATCF/ATGW function is introduced, an SCC-AS function is newly added to support an eSRVCC function to complete voice call continuity control and access/service domain selection, and based on requirements of authentication, service consistency and domain selection, HLR/EPC-HSS/IMS-HSS three devices are required to be fused. Based on the Gx/Rx resynchronization requirement, the addressing requirement from the I/S-CSCF to the converged HSS, and the addressing requirement for the USIM card to export a universal domain name, the DRA device is required to be able to route and address the IMSI or the IMPU with the IMSI.
The invention provides a number portability communication method, wherein when a VoLTE user is in an IMS domain as a calling party and a carrying-out user is taken as a called party, as shown in figure 1, the communication method of the calling side comprises the following steps:
step S11): receiving a call invitation message sent by a calling side call session control function entity, wherein the call invitation message is sent to the calling side call session control function entity by a first terminal;
step S12): judging whether a calling number corresponding to a first terminal and a called number corresponding to a second terminal belong to the same group user, wherein the second terminal is a VoLTE user;
step S13): if the calling number and the called number do not belong to the same group user, the calling side service control point server performs domain selection on the called user and inquires the position information of the called user according to the domain selection result;
step S14): according to the position information of the called user, the calling side service control point server sends a call invitation information to the calling side call session control function entity, so that the call session control function entity and the telephone number mapping server/domain name system can initiate an inquiry request for inquiring the name authority pointer record of the called number;
step S15): the calling side call session control function entity routes the call to the interworking network element of the IMS domain and other networks according to the called domain name.
Preferably, the step of performing domain selection on the called user and inquiring the location information of the called user according to the domain selection result includes:
sending a UDR command to a home location register to acquire AVP parameters including a user identifier and a data reference;
the home location register returns the AVP parameters including the user data to obtain a domain selection result;
according to the domain selection result, sending a UDR command to a home location register to acquire AVP parameters including user identification and data reference;
the home location register returns AVP parameters including user data.
In an embodiment of the present invention, when the carrying-out user is in the IMS domain as a called party:
the home location register returns AVP parameters including user data as: IMS-VOICE-OVER-PS-SUPPORTED (1), the calling side service control point server selects to inquire the user information in the IMS domain;
according to the domain selection result, the calling side service control point server fills in and acquires domain information: PS-Domain (1); and filling in and acquiring node information: 0x01 MME;
the home location register returns AVP parameters including user data as: epsilocationinformation: E-UTROCENTELGloblalD: MCC (3digits) + MNC (2-3digits) + ECI (7digits), E-UTRAN Cell Identity (ECI); and the visited area number is mapped by trackingarea id.
In another embodiment of the present invention, when the carrying-out user is in the CS domain as a called party:
the home location register returns AVP parameters including user data as: IMS-VOICE-OVER-PS-NOT-SUPPORTED (0); and IMS-VOICE-OVER-PS-SUPPORT-UNKNOWN (2), the calling side service control point server selects to inquire the user information in the CS domain;
according to the domain selection result, the calling side service control point server fills in and acquires domain information: CS-Domain (0);
the home location register returns AVP parameters including user data as: locationinfformation: vlrNumber: VLR NUMBER of the user visit place; cell GlobalidOrServiceAreaIdOrLAI the visited cell information of the user under 2/3G.
The domain name corresponding to the called number comprises an operator identifier, a province label and a user number beginning with a routing code.
The present invention also provides a calling side service control point server, as shown in fig. 2, which includes a first receiving module 11, a first determining module 12 and a first domain selecting module 13, wherein:
a first receiving module 11, configured to receive a call invitation message sent by a calling side call session control function entity, where the call invitation message is sent by a first terminal to the calling side call session control function entity;
a first judging module 12, configured to judge whether a calling number corresponding to the first terminal and a called number corresponding to the second terminal belong to the same group user;
and the first domain selection module 13 is configured to perform message interaction with the home location register to perform domain selection on the called user if the calling number and the called number do not belong to the same group user, and query the location information of the called user according to a domain selection result.
Correspondingly, the present embodiment further provides a number portability communication method, as shown in fig. 3, the communication method of the called side includes:
step S21): receiving an invitation message sent by a called side session call control function entity, wherein the call invitation message is sent to the called side session call control function entity by a calling side session call control function entity;
step S22): judging whether a calling number corresponding to the first terminal and a called number corresponding to the second terminal belong to the same group user;
step S23): if the calling number and the called number do not belong to the same group user, the domain selection is carried out on the called user and the position information of the called user is inquired, so that the called side session call control function entity and the called side media gateway control function entity can carry out message interaction, and a call route is established with the second terminal. Specifically, the called side service control point server performs domain selection on the called user and inquires the position information of the called user, and sends an invitation message to a called side session call control function entity to issue a route; the called side session call control function entity triggers the called side multimedia telephone application server to carry out routing domain selection so as to establish call routing with the second terminal.
Preferably, if the calling number and the called number do not belong to the same group user, the step of the called side service control point server performing domain selection on the called user and inquiring the location information of the called user includes:
when the carrying-out user is in the IMS domain and is taken as a called party, the called side service control point server sends the UDR to the home location register to inquire the location information of the called party, and the home location register returns the UDA;
when the carrying-out user is in the CS domain and is taken as a called party, the called side service control point server sends sh to the home location register to inquire the location information of the called party, and the home location register returns the UDA.
When the carrying-out user is in the CS domain as the called party, the called party side call session control function entity goes out to the CS domain through the media gateway control function to continue the called party according to the domain selection result of the called party side multimedia telephone application server.
Correspondingly, the present invention further provides a called side service control point server, as shown in fig. 4, which includes a second receiving module 21, a second determining module 22, and a second domain selecting module 23, where:
a second receiving module 21, configured to receive a call invitation message sent by a called-side call session control function entity, where the call invitation message is sent by a calling-side call session control function entity to the called-side call session control function entity;
a second judging module 22, configured to judge whether the calling number corresponding to the first terminal and the called number corresponding to the second terminal belong to the same group user;
the second domain selection module 23 is configured to, if the calling number and the called number do not belong to the same group user, perform domain selection on the called user and query location information of the called user, so that the called side session call control function entity performs message interaction with the called side media gateway control function entity, and establish a call route with the second terminal. Specifically, the method carries out message interaction with a home location register so as to carry out domain selection on a called user; and the called side session call control function entity performs message interaction with the called side media gateway control function entity according to the domain selection result and establishes a call route with the second terminal.
In the service control point servers of fig. 2 and 4, each module uses "first" and "second" to distinguish between the calling side and the called side.
Before a first terminal of a VoLTE calling user communicates with a second terminal of a called user, a corresponding basic calling process needs to be completed, and the SIP related signaling flow in VoLTE calling establishment is the same as the normal IMS calling side flow; the voice bearer needs to be established in the calling process, and an update message needs to be sent to the called side after the bearer is established. The following detailed description will be made for the VoLTE user in the IMS domain as the calling party and the carry-out user in the IMS domain or the CS domain as the called party, respectively.
As an embodiment of the present invention, the following group user number portability communication method is applicable to an application scenario in which a second terminal with a ported-out number registered in an IMS domain is used as a called party, and a first terminal of another group network is used as a calling party in the IMS domain.
As shown in the signaling diagram of fig. 5, the call flow when the VoLTE user is in the IMS domain as the calling party, and the number portability carry-out user is in the IMS domain as the called party is as follows:
step 101): the first terminal sends a call invitation message to a calling side call session control function entity.
With reference to fig. 1 and fig. 3, in a possible implementation technical solution, step 101) a first terminal sends a call invitation message to a calling side call session control function entity, which specifically includes:
1): a calling user UE-A dials the long number of a called user UE-B, and a first terminal A initiates a call service request message to a base station;
2): the base station forwards the call service request message to the mobility management entity. It will be appreciated that the security procedure may be performed according to the policy of the operator.
3): the mobile management entity initiates a wireless connection establishment request to the base station based on the call service request message, and sends a first terminal message corresponding to the calling subscriber to the base station.
4): the base station establishes a radio bearer with the first terminal based on the radio connection establishment request.
5): the base station sends a call INVITE (INVITE) message to the serving gateway.
In the step, a first terminal corresponding to a calling user sends an uplink data invitation message to a base station; the base station forwards the call invite message to the serving gateway.
6): the service gateway forwards the call invitation message to the calling side call session control function entity.
In this step, the serving gateway forwards the call invite message to the proxy gateway, and the serving gateway forwards the invite message to the call session control function entity.
Step 102): and the calling side call session control function entity forwards the call invitation message to the calling side multimedia telephone application server.
In this step, the calling side call session control function entity triggers a calling side multimedia telephony application server (MMTEL AS) according to the iFC subscription information (Initial Filter Criteria) of the calling user, where the calling number is a long number and the called number is a long number.
Step 103): after the calling side multimedia telephone application server processes the basic service, it sends the calling invitation message to the calling side calling session control function entity S-CSCF (O), where the REQUEST URI is the long number of the called user.
The calling side call session control function entity S-CSCF is in the core position in IMS network session control, receives the register request forwarded by P-CSCF from the visit network, carries out user authentication by cooperating with the home location register, and downloads the service data signed by the user from the home location register. The S-CSCF performs routing management on the calling side and the called side, and performs SIP AS triggering according to iFC signed by the user, so AS to realize rich IMS service functions. The main functions of the S-CSCF include: 1) registering, namely receiving a registration request, and enabling the registration request to take effect through the HSS; 2) and message flow processing, namely controlling the registered session terminal to be used as a Proxy-Server (Proxy-Server). After receiving the request, carrying out internal processing or forwarding, and also interrupting or initiating an SIP transaction; 3) interacting with a service platform: multimedia services are provided.
Step 104): the calling side call session Control function entity S-CSCF sends a call invitation message to a calling side Service Control Point Server (SCP AS) according to the iFC user subscription message, wherein the call invitation message comprises a calling number and a called number, the calling number is a long number, and the called number is a long number. The service control point application server is a logic functional entity after SCP upgrade, provides intelligent network service logics such as VPN short number type, number hiding conversion type, charging and recharging type, position correlation type, family call control type, information pushing type and the like for VoLTE users, and is used for inheriting the current network intelligent service.
Step 105): and the calling side service control point server inquires whether the calling number corresponding to the first terminal and the called number corresponding to the second terminal belong to the same group.
Step 106): if the calling number and the called number do not belong to the same group, the calling side service control point server performs domain selection on the called user and inquires the position information of the called user according to the domain selection result.
If not, determining the calling is the group calling. For group calling of group network external number, the calling side service control point server sends UDR command to home location register (HSS) to inquire the location information of the called user. The method comprises the following steps:
1): the calling side service control point server firstly selects the domain of the called user. The UDR AVP key parameter sent by the calling side service control point server to the home location register is shown in fig. 6A; the UDA AVP key parameter fill returned by the home location register is shown in fig. 6B.
In fig. 6A, the User-Identity parameter is a User identifier, which is generally a mobile phone number of a User; the Data-Reference parameter is the Data Reference, and TADSinformation therein is the called access domain selection information. In FIG. 6B, the User-Data parameter is User Data, T-ADS Information: IMS-VOICE-OVER-PS-SUPPORTED (1) is selected for an access domain, and here means that a calling side service control point server selects to inquire user information in an IMS domain. The T-ADS Information identifies the selection of the called access domain, which shows that the home location register of the user inquires the location Information of the user, and then selects whether to inquire the location of the user in the IMS domain or the CS domain according to the returned parameter Information, and thus, the user is accessed to different network equipment to complete the call according to the IMS domain or the CS domain where the user is located.
2): and the calling side service control point server inquires the position information of the called user according to the domain selection result. The UDR AVP key parameter sent by the calling side service control point server to the home location register is shown in fig. 6C; the UDA AVP key parameter returned by the home location register is shown in figure 6D.
In fig. 6C, in the Data-Reference parameter, LocationInformation (14) is position information; in the Current-Location parameter, initiateactive Location retrieval (1) indicates retrieval from the initial access Location; in the Requested-Domain parameter, PS-Domain (1) represents the acquisition Domain information; in the Requested-Nodes parameter, the following values are filled: 0x01 MME. In fig. 6D, in the User-Data parameter, epsilocationinformation is the location information of the evolved packet network EPS; E-UTRANCellGlobalId is the cell globally unique ID number (identification number) of the evolved access network: MCC (3digits) mobile country number + MNC (2-3digits) mobile network number + ECI (7digits), E-UTRAN Cell Identity (ECI) E-UTRAN Cell identification; and trackingarea ID is a tracking area ID number indicating a visited area number mapped by trackingarea ID.
Step 107): the calling side service control point server sends a call invitation message to a calling side call session control function entity, wherein the REQUEST URI is the long number (namely the real number) of the called user.
Step 108): the calling side call session control function entity initiates inquiry to the telephone number mapping server/domain name system, and inquires the name authority pointer record of the called number.
When calling a number portability user, the involved network elements include a telephone number mapping server/domain name system (ENUM/DNS), an interworking network element (e.g., IBCF) of the IMS with other networks, and the like. The main functions of the telephone number mapping server/domain name system include: the carrying-out information of the user in the local network can be obtained through the charging system; obtaining and updating the portable subscriber information among other operators, such as: china mobile users carry numbers to switch to China telecom, and need to save international user identification codes and routing codes of mobile stations; if the forwarding carrying information corresponding to the user is not stored, the routing code is the routing code corresponding to the network owned by the user number. After a calling user initiates a calling service in an IMS domain, the IBCF selects an IMS network to which a called number belongs according to the number field information of the called user terminal number, and routes a service request to an IBCF network element to which a called number belongs. Wherein, the intercommunication network element of the signaling surface is IBCF, and the intercommunication protocol adopts SIP protocol; the interworking network element of the media plane is a transition gateway (TrGW), and the interworking protocol adopts an RTP protocol.
Step 109): the telephone number mapping server/domain name system returns the domain name corresponding to the called number to the calling side calling session control function entity, and the domain name comprises an operator identifier, a province label and a user number beginning with a routing code.
According to the domain name corresponding to the called number, the calling side call session control function entity can route the call to the intercommunication network element of the IMS domain and other domains.
Step 110): the calling side call session control function entity sends a call invitation message to the called side call session control function entity.
And the calling side call session control function entity sends the call invitation message to the called side call session control function entity according to the SIP URI of the called user.
Step 111): after receiving the call invitation message of the calling side call session control function entity, the called side call session control function entity triggers the call to a called side service control point server according to the iFC subscription information of the called user.
Step 112): and after receiving the call invitation message, the called side service control point server judges whether the calling number corresponding to the first terminal and the called number corresponding to the second terminal belong to the same group user.
Step 113): if the calling number and the called number do not belong to the same group, the called side service control point server performs domain selection on the called user and inquires the position information of the called user.
And after receiving the call invitation message, the called side service control point server acquires the calling number through PAI and judges that the call is an external call of the group network. The called side service control point server sends the UDR to the home location register to inquire the location information of the called user, and the home location register returns the UDA.
Step 114): the called side service control point server sends a call invitation message to the called side call session control function entity and sends down a route.
Step 115): the called side call session control function entity triggers the called side multimedia telephone application server.
Step 116): the called side multimedia telephone application server provides basic service and routing domain selection, and returns the routing domain selection result to the called side call session control function entity.
Step 117): the first terminal and the second terminal establish a call route.
In the step, the session is established through the subsequent message interaction of 180ringing, PRACK \200OK, 200OK and the like.
It can be understood that the first terminal corresponding to the calling user UE-a sends a BYE message to release the session. And after receiving the BYE message, the called side multimedia application server and the called side service control point application server release the session, and if the session is an off-network number group call, write a CDR call record ticket.
As another embodiment of the present invention, the group user number portability communication method is suitable for an application scenario in which a carry-out number is registered in a second terminal of a CS domain as a called party, and a first terminal of another group network is used as a calling party in an IMS domain.
Referring also to the signaling diagram shown in fig. 5, the call flow when the VoLTE user is in the IMS domain as the calling party, and the number portability carry-out user is in the CS domain as the called party is as follows:
step 201): the first terminal sends a call invitation message to a calling side call session control function entity.
With reference to fig. 1 and fig. 3, in a possible implementation technical solution, step 201) a first terminal sends a call invitation message to a calling side call session control function entity, which specifically includes:
1): a calling user UE-A dials the long number of a called user UE-B, and a first terminal A initiates a call service request message to a base station;
2): the base station forwards the call service request message to the mobility management entity. It will be appreciated that the security procedure may be performed according to the policy of the operator.
3): the mobile management entity initiates a wireless connection establishment request to the base station based on the call service request message, and sends a first terminal message corresponding to the calling subscriber to the base station.
4): the base station establishes a radio bearer with the first terminal based on the radio connection establishment request.
5): the base station sends a call INVITE (INVITE) message to the serving gateway.
In the step, a first terminal corresponding to a calling user sends an uplink data invitation message to a base station; the base station forwards the call invite message to the serving gateway.
6): the service gateway forwards the call invitation message to the calling side call session control function entity.
In this step, the serving gateway forwards the call invite message to the proxy gateway, and the proxy gateway forwards the invite message to the call session control function entity.
Step 202): and the calling side call session control function entity forwards the call invitation message to the calling side multimedia telephone application server.
In this step, the calling side call session control function entity triggers a calling side multimedia telephony application server (MMTEL AS) according to the iFC subscription information (Initial Filter Criteria) of the calling user, where the calling number is a long number and the called number is a long number.
Step 203): after the calling side multimedia telephone application server processes the basic service, it sends the calling invitation message to the calling side calling session control function entity S-CSCF (O), where the REQUEST URI is the long number of the called user. The S-CSCF is in the core position in IMS network session control, receives the registration request forwarded by the P-CSCF from the visiting network, performs user authentication by matching with the home location register, and downloads the service data signed by the user from the home location register. The S-CSCF performs routing management on the calling side and the called side, and performs SIP AS triggering according to iFC signed by the user, so AS to realize rich IMS service functions. The main functions of the S-CSCF include: 1) registering, namely receiving a registration request, and enabling the registration request to take effect through the HSS; 2) and message flow processing, namely controlling the registered session terminal to be used as a Proxy-Server (Proxy-Server). After receiving the request, carrying out internal processing or forwarding, and also interrupting or initiating an SIP transaction; 3) interacting with a service platform: multimedia services are provided.
Step 204): the calling side call session Control function entity S-CSCF sends a call invitation message to a calling side Service Control Point Server (SCP AS) according to the iFC user subscription message, wherein the call invitation message comprises a calling number and a called number, the calling number is a long number, and the called number is a long number. The service control point application server is a logic functional entity after SCP upgrade, provides intelligent network service logics such as VPN short number type, number hiding conversion type, charging and recharging type, position correlation type, family call control type, information pushing type and the like for VoLTE users, and is used for inheriting the current network intelligent service.
Step 205): and the calling side service control point server inquires whether the calling number corresponding to the first terminal and the called number corresponding to the second terminal belong to the same group.
Step 206): if the calling number and the called number do not belong to the same group, the calling side service control point server performs domain selection on the called user and inquires the position information of the called user according to the domain selection result.
If not, determining the calling is the group calling. For group calling of group network external number, the calling side service control point server sends UDR command to home location register (HSS) to inquire the location information of the called user. The method comprises the following steps:
1): the calling side service control point server firstly selects the domain of the called user. The UDR AVP key parameter sent by the calling side service control point server to the home location register is shown in fig. 7A; the UDA AVP key parameter fill returned by the home location register is shown in fig. 7B.
In fig. 7A, the User-Identity parameter is a User identifier, which is generally a mobile phone number of the User; the Data-Reference parameter is the Data Reference, and TADSinformation therein is the called access domain selection information. In fig. 7B, among the User-Data parameters, IMS-VOICE-OVER-PS-NOT-SUPPORTED (0) and IMS-VOICE-OVER-PS-SUPPORTED-UNKNOWN (2) indicate that VOICE OVER IMS is NOT SUPPORTED, and the calling-side service control point server selects to query the User information in the CS domain.
2): and the calling side service control point server inquires the position information of the called user according to the domain selection result. The UDR AVP key parameter sent by the calling side service control point server to the home location register is shown in fig. 7C; the UDA AVP key parameter returned by the home location register is shown in figure 7D.
In FIG. 7C, in the Requested-Domain parameter, CS-Domain (0) represents acquisition Domain information; in FIG. 7D, LocationInformation is position information in the User-Data parameter; the vlrNumber is a VLR NUMBER of a user visit place; cellglobaldorserviceareidetorlai is a cell global identity or a service area identity or LAI and represents visited cell information of a user under 2/3G.
Step 207): the calling side service control point server sends a call invitation message to a calling side call session control function entity, wherein the REQUEST URI is the long number (namely the real number) of the called user.
Step 208): the calling side call session control function entity initiates inquiry to the telephone number mapping server/domain name system, and inquires the name authority pointer record of the called number.
When calling a number portability user, the involved network elements include a telephone number mapping server/domain name system (ENUM/DNS), an interworking network element (e.g., IBCF) of the IMS with other networks, and the like. The main functions of the telephone number mapping server/domain name system include: the carrying-out information of the user in the local network can be obtained through the charging system; obtaining and updating the portable subscriber information among other operators, such as: china mobile users carry numbers to switch to China telecom, and need to save international user identification codes and routing codes of mobile stations; if the forwarding carrying information corresponding to the user is not stored, the routing code is the routing code corresponding to the network owned by the user number. After a calling user initiates a calling service in an IMS domain, the IBCF selects an IMS network to which a called number belongs according to the number field information of the called user terminal number, and routes a service request to an IBCF network element to which a called number belongs. Wherein, the intercommunication network element of the signaling surface is IBCF, and the intercommunication protocol adopts SIP protocol; the interworking network element of the media plane is a transition gateway (TrGW), and the interworking protocol adopts an RTP protocol.
Step 209): the telephone number mapping server/domain name system returns the domain name corresponding to the called number to the calling side calling session control function entity, and the domain name comprises an operator identifier, a province label and a user number beginning with a routing code.
According to the domain name corresponding to the called number, the calling side call session control function entity can route the call to the intercommunication network element of the IMS domain and other domains.
Step 210): the calling side call session control function entity sends a call invitation message to the called side call session control function entity.
And the calling side call session control function entity sends the call invitation message to the called side call session control function entity according to the SIP URI of the called user.
Step 211): after receiving the call invitation message of the calling side call session control function entity, the called side call session control function entity triggers the call to a called side service control point server according to the iFC subscription information of the called user.
Step 212): and after receiving the call invitation message, the called side service control point server judges whether the calling number corresponding to the first terminal and the called number corresponding to the second terminal belong to the same group user.
Step 213): if the calling number and the called number do not belong to the same group, the called side service control point server performs domain selection on the called user and inquires the position information of the called user.
And after receiving the call invitation message, the called side service control point server acquires the calling number through PAI and judges that the call is an external call of the group network. The called side service control point server sends sh to the home location register to inquire the location information of the called user, and the home location register returns the UDA.
Step 214): the called side service control point server sends a call invitation message to the called side call session control function entity and sends down a route.
Step 215): the called side call session control function entity triggers the called side multimedia telephone application server.
Step 216): the called side multimedia telephone application server provides basic service and routing domain selection, and returns the routing domain selection result to the called side call session control function entity.
Step 217): the first terminal and the second terminal establish a call route.
In this step, the called side call session Control Function entity goes out to the CS domain through a media gateway Control Function (MGCF for short) entity according to the domain selection result of the called side multimedia telephony application server to continue to be called, and session is established through subsequent message interaction of 180ringing, PRACK \200OK, and the like.
It can be understood that the first terminal corresponding to the calling user UE-a sends a BYE message to release the session. And after receiving the BYE message, the called side multimedia application server and the called side service control point application server release the session, and if the session is an off-network number group call, write a CDR call record ticket.
Compared with the prior art, the number portability communication method of the invention comprises the following steps: the method fully considers the condition that a WVPN group user opens a VoLTE service and registers in an IMS domain, and calls a user who is in the IMS domain or a CS domain as another called group network after carrying out number portability, and introduces and inquires domain selection and position information of a called number and name authority pointer records after carrying out number portability on the group user so as to obtain an operator identifier, a province label and a user number starting from a routing code, thereby realizing that a calling side calling session control function entity routes a call to a called side calling session control function entity according to the name of the called domain and interacts with other IMS domain and CS domain network elements to realize the whole process of the call.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A communication method for number portability is characterized in that a VoLTE user is in an IMS domain and serves as a calling party, and when a carrying-out user serves as a called party, the communication method comprises the following steps:
receiving a call invitation message sent by a calling side call session control function entity, wherein the call invitation message is a message which is sent to the calling side call session control function entity by a first terminal and is forwarded to a calling side service control point server by the calling side call session control function entity;
judging whether a calling number corresponding to a first terminal and a called number corresponding to a second terminal belong to the same group user, wherein the second terminal is a VoLTE user;
if the calling number and the called number do not belong to the same group user, performing domain selection on the called user, and inquiring the position information of the called user according to the domain selection result;
and sending the call invitation message to the calling side call session control function entity according to the position information of the called user, so that the calling side call session control function entity and a telephone number mapping server/domain name system initiate a query request for querying name authority pointer records of the called number, and route the call to an interworking network element of an IMS domain and other networks according to the name of the called domain.
2. The number portability communication method of claim 1, wherein the step of performing domain selection on the called party if the calling number and the called number do not belong to the same group subscriber, and querying the location information of the called party according to the domain selection result comprises:
sending a UDR command to a home location register to acquire AVP parameters including a user identifier and a data reference;
the home location register returns AVP parameters including user data to obtain a domain selection result;
according to the domain selection result, sending a UDR command to the home location register to acquire AVP parameters including user identification and data reference;
the home location register returns AVP parameters including user data.
3. The method of claim 2, wherein when the ported-out subscriber is in the IMS domain as a called party:
the home location register returns AVP parameters including user data as: IMS-VOICE-OVER-PS-SUPPORTED (1), the said calling side service control point server chooses to inquire about the user information in IMS field;
according to the domain selection result, the calling side service control point server fills out and acquires domain information: PS-Domain (1); and filling in and acquiring node information: 0x01 MME;
the home location register returns AVP parameters including user data as: epsilocationinformation: E-UTROCENTELGloblalD: MCC (3digits) + MNC (2-3digits) + ECI (7digits), E-UTRAN CellIdentity (ECI); and the visited area number is mapped by trackingarea id.
4. The method of claim 2, wherein when the portable subscriber is in the CS domain as the called party:
the home location register returns AVP parameters including user data as: IMS-VOICE-OVER-PS-NOT-SUPPORTED (0); and IMS-VOICE-OVER-PS-SUPPORT-UNKNOWN (2), the said calling side business control point server chooses to inquire about the user information in CS domain;
according to the domain selection result, the calling side service control point server fills out and acquires domain information: CS-Domain (0);
the home location register returns AVP parameters including user data as: locationinfformation: vlrNumber: VLR NUMBER of the user visit place; cell GlobalidOrServiceAreaIdOrLAI the visited cell information of the user under 2/3G.
5. The portable number portability communication method of claim 1, wherein the domain name corresponding to the called number comprises an operator identifier, a province label, and a subscriber number beginning with a routing code.
6. A calling side service control point server is characterized by comprising a receiving module, a judging module and a domain selecting module, wherein:
a receiving module, configured to receive a call invitation message sent by a calling side call session control function entity, where the call invitation message is a message that is sent by a first terminal to the calling side call session control function entity and is forwarded to a calling side service control point server by the calling side call session control function entity;
the judging module is used for judging whether a calling number corresponding to the first terminal and a called number corresponding to the second terminal belong to the same group user, and the second terminal is a VoLTE user;
the domain selection module is used for performing domain selection on the called user if the calling number and the called number do not belong to the same group user, and inquiring the position information of the called user according to the domain selection result;
and the sending module is used for sending the call invitation message to the calling side call session control function entity according to the position information of the called user, so that the calling side call session control function entity and a telephone number mapping server/domain name system initiate a query request for querying name authority pointer records of the called number, and the call is routed to an interworking network element of an IMS domain and other networks according to the name of the called domain.
7. A method of communicating for number portability, comprising:
receiving a call invitation message sent by a called side call session control function entity, wherein the call invitation message is the call invitation message sent by a calling side service control point server receiving the calling side call session control function entity, domain-selecting a called user under the condition that a calling number corresponding to a first terminal and a called number corresponding to a second terminal do not belong to the same group user, inquiring the position information of the called user according to the domain-selecting result, forwarding the call invitation message to the calling side call session control function entity according to the position information of the called user, initiating an inquiry request for inquiring the name authority pointer record of the called number by the calling side call session control function entity and a telephone number mapping server/domain name system, and routing the call to an interworking network element of an IMS domain and other networks according to the name of the called domain, the message is sent to the called side call session control function entity by the calling side call session control function entity and is forwarded to a called side service control point server by the called side call session control function entity;
judging whether a calling number corresponding to the first terminal and a called number corresponding to the second terminal belong to the same group user;
and if the calling number and the called number do not belong to the same group user, performing domain selection on the called user and inquiring the position information of the called user so as to allow the called side call session control function entity to perform message interaction with the called side media gateway control function entity and establish a call route with the second terminal.
8. The number portability communication method of claim 7, wherein the step of domain selecting the called party and inquiring the location information of the called party if the calling number and the called number do not belong to the same group subscriber comprises:
when the carrying-out user is in the IMS domain and is taken as a called party, sending the UDR to a home location register to inquire the location information of the called party, and returning the UDA to the home location register;
when the carrying-out user is in the CS domain and is taken as a called party, the UDR is sent to a home location register to inquire the location information of the called party, and the home location register returns the UDA.
9. The number portability communication method of claim 8, wherein when the portable subscriber is in the CS domain as the called party, the called-side call session control function entity further connects the called party to the CS domain through the media gateway control function entity according to the domain selection result of the called-side multimedia telephony application server.
10. A called side service control point server is characterized by comprising a receiving module, a judging module and a domain selecting module, wherein:
a receiving module, configured to receive a call invitation message sent by a called-side call session control function entity, where the call invitation message is a call invitation message sent by a calling-side service control point server receiving the call invitation message sent by a calling-side call session control function entity, perform domain selection on a called user under the condition that it is determined that a calling number corresponding to a first terminal and a called number corresponding to a second terminal do not belong to the same group user, query location information of the called user according to the domain selection result, forward the call invitation message to the calling-side call session control function entity according to the location information of the called user, where the calling-side call session control function entity and a telephone number mapping server/domain name system initiate a query request for querying a name authority pointer record of the called number, and route the call to an interworking network element of an IMS domain and other networks according to the name of the called domain, the message is sent to the called side call session control function entity by the calling side call session control function entity and is forwarded to a called side service control point server by the called side call session control function entity;
the judging module is used for judging whether a calling number corresponding to the first terminal and a called number corresponding to the second terminal belong to the same group user;
and the domain selection module is used for performing domain selection on the called party and inquiring the position information of the called party if the calling number and the called number do not belong to the same group user, so that the called side call session control function entity performs message interaction with the called side media gateway control function entity, and a call route is established with the second terminal.
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