WO2017107643A1

WO2017107643A1 - Ims local service routing processing method and system

Info

Publication number: WO2017107643A1
Application number: PCT/CN2016/103100
Authority: WO
Inventors: 李振东
Original assignee: 中兴通讯股份有限公司
Priority date: 2015-12-24
Filing date: 2016-10-24
Publication date: 2017-06-29
Also published as: CN106921935A

Abstract

The present invention provides an IMS local service routing processing method and system, the processing method comprising: a network element within a home network receives a call request from a user equipment (UE), wherein a number called by the call request is a local number in a visited network; the network element within the home network sends, on the basis of the call request, a request to a network element of the visited network for searching geographical information of the UE location; the network element of the home network receives a request response sent by the network element of the visited network, wherein the response carries at least one of the following geographical information: a country code of a country of the UE location, an area code of an area of the UE location, or a postal code of the area of the UE location; and the geographical information provides a basis for the home network to generate a routing number that may be used globally. The invention addresses an inability of the UE to be switched to a local number leading to the UE being unable to make a call request while in roaming mode when a P-GW and an S-GW are not within a same network.

Description

IMS local service routing processing method and system

Technical field

The present invention relates to the field of communications, and in particular to a method and system for routing a IMS local service.

Background technique

The IP Multimedia Core Subsystem (IMS) is an IP-based network architecture proposed by the 3rd Generation Partnership Project (3GPP) to build an open and flexible network. The business environment supports multimedia applications and provides users with rich multimedia services.

In the IMS service system, the control layer and the service layer are separated. The control layer does not provide specific services, and only provides necessary triggering, routing, and accounting functions to the service layer. The IMS provides the capability of the service layer. The user needs to access the carrier network through an Evolved Packet System (EPS).

FIG. 1 is a schematic diagram of a basic architecture of an IMS+EPS defined by the 3GPP in the related art. As shown in FIG. 1 , the service triggering and control function in the control layer is implemented by a Call Session Control Function (CSCF). The call session control function CSCF is divided into: proxy call session control function (Proxy-CSCF, abbreviated as P-CSCF), query call session control function (Interrogating-CSCF, referred to as I-CSCF) and service call session control function (Serving- CSCF, abbreviated as S-CSCF, is three types.

The business layer is composed of a series of application servers (Application Servers, referred to as ASs), which can provide specific business services. The control layer (S-CSCF) controls the service trigger according to the subscription information of the user, and invokes the service on the AS to implement the service function. The user's subscription data is stored in the home subscription server (HSS). When the user registers with the IMS, the subscription data is downloaded from the HSS to the S-CSCF to which the user is registered.

The end-to-end device in the session is called a user equipment (User Equipment, UE for short) and is responsible for the interaction with the user. Some UEs have multiple access networks, including packet switching through 3GPP (Packet Switch, referred to as For the PS) domain access network, access the network through other non-3GPP PS domains. Each user is assigned at least one SIP URI, called IMS public user identity (IMPU), in the format sip:xyz@abc.com.

Mobility Management Element (MME), the core network control plane network element, mainly authenticates and signs the UE. The MME selects a Serving Gateway (S-GW for short) and a Packet Data Network Gateway (P-GW) for the user. When the user is in the idle state, the MME may initiate paging to the user according to the saved user context. The MME also provides mobility management across base stations.

S-GW: User plane network element, the anchor point when the user moves across the base station, and provides the roaming interface with the P-GW in the roaming situation. When the user is in an idle state, the S-GW buffers the user data and triggers the MME to page the user.

The P-GW is a user plane network element that allocates an IP (Internet Protocol) address to the UE and accesses the service network. When the user moves When the P-GW is the IP layer anchor, it will not change, thus ensuring business continuity.

Policy and Charging Rules Function (PCRF) is used to formulate Quality of Service (QoS) and charging policies for services using network resources. The PCRF needs to combine the application function (Application Function, referred to as AF). In the IMS system, the P-CSCF is an AF-received service information, and the Subscription Profile Repository (SPR) is used. Received user subscription information, policies configured by the operator, etc. The PCRF sends the control policy for the service to the Policy and Charging Enforcement Function (PCEF) or the Bearer Binding and Event Report Function (BBERF). At the same time, the PCRF can subscribe to the bearer layer related events to the PCEF and/or the BBERF to sense in time when the bearer layer occurs, and change the control strategy. In addition, the PCEF and the Traffic Detection Function (TDF) can perform application detection according to the PCC rules (PCEF) or the Application and Detection Control (ADC) rules (TDF) delivered by the PCRF. control function.

A very common service in the communication system during local service. For example, the user in the A place to the B place can directly dial the local/regional number without adding the area code before the number. Or when you are roaming abroad, dial the called number directly without attaching a country code. For example, after a US user arrives in China, they can dial the local number 139xxxxxxxx directly without dialing +86139xxxxxxxx.

In the IMS system, SIP routing is performed according to the called number, and the local number is not a Global Routing Number (GRN), and the number must be converted into a global routable number to be executed. The called process; FIG. 2 is a flowchart of processing of the IMS local number in the related art in the related art. As shown in FIG. 2, the steps of the process include:

Step S201: The UE sends a call request to the P-CSCF, where the called number is a local number;

Step S202: After receiving the call, the P-CSCF finds that this is a local number, and the P-CSCF queries the PCRF/-GW for location information. After the location information is queried, the P-CSCF generates a Geographical Identifier based on the location information;

The location information usually includes cell information (Cell ID), Tracking Area (TA) information, and a comparison table of the information and the geographic identifier is configured on the P-CSCF.

Step S203: The P-CSCF then inserts the GIS into the Invite message and sends it to the S-CSCF of the user's home IMS network.

Step S204: The S-CSCF forwards the call request to the AS for processing;

Step S205: The AS converts to a global routable number according to the received information;

Step S206: The AS continues the call process, in which the called number has been converted into a global routable number.

For the foregoing step S202, in the related art, after the P-CSCF requests the location information from the PCRF, there are multiple specific query modes, and the PCRF may initiate a bearer modification process or a bearer setup process, and obtain the location of the UE in this process. Information, PCRF can also directly query the location information to the P-GW. Figure 3 shows the PCRF pass-through in the related art. A flowchart for modifying the obtained location information, wherein the location information of the query is similar in the bearer establishment process, as shown in FIG. 3, the steps of the process include:

Step S301: The P-CSCF queries the PCRF for location information.

Step S302: The PCRF initiates an IP-CAN session modification request.

The request may modify the QoS of the session, or may not be modified. If the QoS is not modified, the step S305 is not triggered;

Step S303: The P-GW initiates a bearer modification to the S-GW.

Step S304: The S-GW initiates a bearer modification to the MME.

Step S305: If the QoS is modified, the MME needs to initiate a resource modification process to the eNodeB.

Step S306: The MME returns a bearer modification response to the S-GW, where the location information is included;

Step S307: The S-GW returns a bearer modification response to the P-GW, where the location information is included;

Step S308: The P-GW returns a session modification response to the PCRF, where the location information is included;

Step S309: The PCRF replies to the location information of the P-CSCF.

However, there is a restriction on the above solution in the related art, which must be IMS Local Breakout (LBO), that is, P-CSCF, PCRF, P-GW, S-GW, and MME. In a network.

4 is a schematic diagram showing the architecture of S8HR (S8Home Routed) in the related art, as shown in FIG. 4, in this architecture, the MME, the S-GW is in the visited network, and the P-GW, the PCRF, the P-CSCF, and the like The element is in the home network. At this time, the technical solution in FIG. 2 above generates a problem. The current location information of the user is perceived by the MME, and can be notified to the P-GW through multiple schemes, and the P-CSCF is from the PCRF/P. -GW gets, internally converted to GI.

However, in FIG. 4, since the P-GW and the S-GW are not in one network, the visited network does not provide the home network with information related to the network topology, such as the visited network cell, the TA, etc., for various reasons (such as security), and The mapping between these information and geographic identifiers. Therefore, the P-CSCF in the home network cannot be converted into a valid geographical identity, and the AS cannot complete the number conversion.

As in the architecture of Figure 4 above, one Chinese user roams to the United States, S-GW, MME in the US network, and the remaining network elements in China. The US network operator does not tell the Chinese operators the information related to the network topology, such as the network cell and the TA, and the mapping relationship between the information and the geographical indication. Then, when the user dials a local number 2345678 whose area code is 301, the user directly dials 2345678 according to the habit. In step S202 shown in FIG. 2, the P-CSCF of the home Chinese network cannot generate a valid geographical indication (lack of area code), and in step S205, the AS further converts to 0012345678 (001 is the US country code) to continue routing, but After the call arrives in the United States, the specific area cannot be identified and the call fails; or the AS believes that this is the Chinese number to continue the call. In either case, the call will fail.

In the related art, when the P-CSCF queries the location information, in addition to the cell information and the TA information, the UE can obtain the UE's Latitude information. However, in the LBO architecture, this information is not relied upon to generate a geographical indication. This is because the operator needs to configure a mapping table between the network coverage area, latitude and longitude, and geographical indication, which is very complicated. In the case of S8HR, this approach becomes even more impossible. Operators need to configure mapping tables between latitude and longitude and geographical indications around the world.

In view of the above problems in the related art, there is currently no effective solution.

Summary of the invention

The embodiment of the present invention provides a method and a system for processing a IMS local service, so as to at least solve the related art, because the P-GW and the S-GW are not in a network, and the local number cannot be converted when the UE is in a roaming state, The problem that caused the call request to fail.

According to an aspect of the present invention, a routing processing method for an IMS local service of an IP multimedia subsystem is provided. The processing method includes: a network element in a home network receives a call request of a user equipment UE, where the call is The called number in the request is a local number of the visited network; the network element in the home network initiates a request for querying the geographical information of the UE to the network element in the visited network according to the call request; The network element in the home network receives the response of the network element in the visited network to the request, where the response carries geographical information of at least one of the following: a country code of the country where the UE is located, and the UE The area code of the area in which the UE is located; the geographic information provides a basis for the home network to generate a global routable number.

Optionally, the network element in the home network includes: a proxy call session control function P-CSCF, a policy and charging rule function PCRF, a PDN gateway P-GW, and an application server AS; the network element in the visited network The method includes: a mobility management unit MME and a serving gateway S-GW.

Optionally, the network element in the home network receives the call request sent by the user equipment UE by using the called number, and the P-CSCF receives the call request sent by the UE.

Optionally, the requesting, by the network element in the home network, to the network element in the visited network to query the geographic information of the UE according to the call request includes: the P-CSCF initiating the PCRF a request for querying location information, wherein the request for querying location information carries a query indication for querying the geographic information; or the P-CSCF initiates a request for querying geographic information to the PCRF; The PCRF initiates a session modification request carrying the indication of the query geographic information to the P-GW; the P-GW initiates a bearer update request carrying the indication of the query geographic information to the S-GW; the S-GW reports to the S-GW The MME initiates a bearer update request carrying an indication of the query geographic information, where the query geographic information indication is used to instruct the MME to query the geographic information.

Optionally, the receiving, by the network element in the home network, the response of the network element in the visited network in response to the request includes: receiving, by the S-GW, a bearer update response that is sent by the MME and carrying the geographic information. The S-GW sends a bearer update response carrying the geographic information to the P-GW; the P-GW sends a session modification response carrying the geographic information to the PCRF; The P-CSCF sends the geographic information.

Optionally, the global routable number is obtained by: the P-CSCF generating a geographic identifier according to the geographic information, and forwarding a call request carrying the geographical identifier to the AS; the AS Receive the call please And converting the called number into a global routable number according to the geographic identifier.

Optionally, the network element in the home network includes: an application server AS, a home subscription server HSS, and a serving call session control function S-CSCF, where the network element in the visited network includes: a mobility management unit MME.

Optionally, the network element in the home network receives the call request sent by the user equipment UE by the called number, and the S-CSCF receives the call request sent by the UE; the S-CSCF The call request is forwarded to the AS.

Optionally, after the network element in the home network receives the call request sent by the user equipment UE, the method further includes: the AS initiating a query request for the geographic information to the HSS, where the query request is Having the query indication carrying the geographic information; the HSS transmitting the geographic information to the AS; the AS converting the called number into a global routable number according to the geographic information, and according to the global The routable number continues to perform the call operation.

Before the HSS sends the geographic information to the AS, the method further includes: the HSS sending the query indication to the MME, where the query indication is used to instruct the MME to query the Geographic information; the MME sends the query response to the HSS, wherein the response carries the geographic information.

Optionally, before the network element in the home network receives the call request sent by the user equipment UE, the method further includes: after the geographical location of the UE changes, the HSS receives the update reported by the MME Geographic information of the UE afterwards.

According to another aspect of the present invention, a routing processing method for an IMS local service of an IP multimedia subsystem is provided, including: a network element in the visited network, and receiving a network element in the home network, receiving the user equipment UE After the call request, the request for querying the geographic information of the UE is sent; the network element in the visited network sends the request to the network element in the home network in response to the request for querying the geographic information. In response, the response request carries geographic information of at least one of: a country code of a country in which the UE is located, an area code of a region in which the UE is located, and a zip code of a region in which the UE is located.

According to another aspect of the present invention, a routing processing system for an IMS local service of an IP multimedia subsystem is provided, where the system includes: a home network element and a visited network element, wherein the home network The network element is configured to receive a call request of the user equipment UE, where the called number in the call request is a local number of the visited network, and is used to query the network element in the visited network according to the call request. a request for geographic information in which the UE is located, wherein the geographic information provides a basis for the home network to generate a global routable number; the network element in the visited network is configured to be responsive to querying the geographic information Responding to send a response to the network element in the home network, where the response request carries the geographic information of at least one of the following: a country code of a country where the UE is located, an area code of a region where the UE is located, and a location The postal code of the region where the UE is located.

Optionally, the P-CSCF is configured to receive the call request sent by the UE.

Optionally, the P-CSCF is further configured to initiate a request for querying location information to the PCRF, where the request for querying location information carries a query indication of the geographic information; or The P-CSCF initiates a request for querying geographic information to the PCRF; the PCRF is configured to initiate a session modification request carrying the indication of the query geographic information to the P-GW; the P-GW is set to The S-GW initiates a bearer update request carrying an indication of the query geographic information; the S-GW is configured to initiate, to the MME, a bearer update request carrying the indication of the query geographic information, where the query indication is used to indicate the location The MME queries the geographic information.

Optionally, the S-GW is configured to receive a bearer update response that is sent by the MME and that carries the geographic information, and send a bearer change response that carries the geographic information to the P-GW; a P-GW, configured to send a bearer session modification response carrying the geographic information to the PCRF, where the PCRF is configured to send the geographic information to the P-CSCF.

Optionally, the global routable number is obtained by: the P-CSCF generating a geographic identifier according to the geographic information, and forwarding a call request carrying the geographical identifier to the AS; the AS Receiving the call request and converting the called number into a global routable number according to the geographic identifier.

Optionally, the network element in the home network further includes: an application server AS, a home subscription server HSS, and a service call session control function S-CSCF, where the network element in the visited network includes: a mobility management unit MME.

Optionally, the S-CSCF is set to the call request sent by the UE, and forwards the call request to the AS.

Optionally, after receiving the call request sent by the user equipment UE by the called number, the system further includes: the AS, configured to initiate a query request for geographic information to the HSS, where the query request is carried Having the query indication of the geographic information; the HSS is configured to send the geographic information to the AS; the AS is further configured to convert the called number into a global routable number according to the geographic information And continuing to perform the call operation according to the global routable number.

Before transmitting the geographic information to the AS, the system further includes: the HSS, configured to send the query indication to the MME, where the query indication is used to instruct the MME to query the Geographic information; the MME, configured to send the query response to the HSS, wherein the response carries the geographic information.

Optionally, before receiving the call request sent by the user equipment UE by the called number, the system further includes: the HSS, after the location of the UE is changed, is set to receive the update reported by the MME. Geographic information of the UE.

Embodiments of the present invention also provide a storage medium. Optionally, in the embodiment, the foregoing storage medium may be configured to store program code for performing the following steps:

S1: The network element in the home network receives the call request of the user equipment UE, where the called number in the call request is the local number of the visited network;

S2: The network element in the home network initiates a geographical message for querying the UE according to the call request to the network element in the visited network. Request for interest;

S3: The network element in the home network receives the response of the network element in the visited network to the request, where the response carries the geographic information of at least one of the following: the country code of the country where the UE is located, the area code of the area where the UE is located, and the UE Postal code of the area; geographic information provides the basis for the home network to generate global routable numbers;

In the embodiment of the present invention, when the UE initiates a call request initiated by the local number to which the network belongs, the network element in the home network initiates a request for querying the geographic information of the UE to the network element in the visited network, and further The network element in the visited network queries the geographic information, and the geographic information provides a basis for the home network to generate a global routable number, that is, even if the P-GW and the S-GW are not in the same network in the related art. The home network can also convert the local number by visiting the geographical information of the visited network, and continue to implement the call, thereby solving the related art that the P-GW and the S-GW are not in one network, and the UE cannot be in the roaming state. The problem of converting the local number, resulting in a failed call request.

DRAWINGS

The drawings described herein are intended to provide a further understanding of the invention, and are intended to be a part of the invention. In the drawing:

1 is a schematic diagram of a basic architecture of an IMS+EPS defined by the 3GPP in the related art;

2 is a flowchart of processing in the related art when an IMS local number is in a call;

FIG. 3 is a flowchart showing that the PCRF obtains location information by bearer modification in the related art;

4 is a schematic diagram showing the architecture of the S8HR in the related art;

5 is a flowchart of a method for processing a local service of an IP multimedia subsystem IMS according to an embodiment of the present invention;

6 is a structural block diagram of a routing processing system for an IMS local service of an IP multimedia subsystem according to an embodiment of the present invention;

7 is a block diagram 1 of an optional structure of a routing processing system for an IMS local service according to an embodiment of the present invention;

8 is a block diagram 2 of an optional structure of a routing processing system for an IMS local service according to an embodiment of the present invention;

9 is a flow chart 1 of an AS querying an HSS for geographic information according to an embodiment of the present invention;

10 is a flow chart 2 of an AS querying an HSS for geographic information according to an embodiment of the present invention;

11 is a flow chart of a P-CSCF querying a PCRF for geographic information according to an embodiment of the present invention.

detailed description

The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

Background of the technical solution of the embodiments of the present invention is divided into a visited network and a home network in the architecture of the S8HR in the related art, where the visited network includes: an MME and an S-GW, and the home network includes: a P-GW, a PCRF, and a P - The network element such as the CSCF, it can be seen that the P-GW and the S-GW are not in one network, and the visited network does not provide the home network with the cell information, the TA, and the network topology related information of the visited network for various reasons, and the information and The mapping between geographic identifiers. Therefore, the P-CSCF in the home network cannot be converted into a valid geographical identity, and the AS cannot complete the number conversion.

The function of the embodiment of the present invention is as follows: The embodiment of the present invention uses the network to query the MME for geographic information of the user, and the MME feeds back the geographic information of the user according to the location information of the UE. Further, the AS may query the HSS for geographic information when the local number conversion is required, and the HSS queries the MME for geographic information. The P-CSCF may also query the PCRF for geographic information. The PCRF may use the bearer setup process or the bearer modification process to query geographic information, or may directly query the P-GW for geographic information. The invention will be described in detail below with reference to the drawings and embodiments of the invention.

Embodiment 1:

In this embodiment, a routing processing method for an IMS local service of an IP multimedia subsystem is provided. FIG. 5 is a flowchart of a method for processing a local service of an IP multimedia subsystem IMS according to an embodiment of the present invention, as shown in FIG. The process includes the following steps:

Step S502: The network element in the home network receives the call request of the user equipment UE, where the called number in the call request is the local number of the visited network;

Step S504: The network element in the home network initiates a request for querying the geographic information of the UE to the network element in the visited network according to the call request.

Step S506: The network element in the home network receives the response of the network element in the visited network to the request, where the response carries the geographic information of at least one of the following: the country code of the country where the UE is located, the area code of the area where the UE is located, and the UE The zip code of the region; geographic information provides the basis for the home network to generate global routable numbers;

The foregoing step S502 to step S506 of the present embodiment, when the UE initiates a call request initiated by the local number of the network, the network element in the home network initiates a query to the network element in the visited network for querying the UE. The request for geographic information, and then the network element in the visited network queries the geographic information, and the geographic information provides a basis for the home network to generate a global routable number, that is, even if the P-GW and the S-GW are not in the same technology. In the network, the home network can also convert the local number through the geographical information queried by the visited network, and continue to implement the call, thereby solving the related art, because the P-GW and the S-GW are not in one network, and the UE is roaming. The local number cannot be converted, causing the call request to fail.

In an optional implementation manner of this embodiment, the network element in the home network in this embodiment may include: a proxy call session control function P-CSCF, a policy and charging rule function PCRF, a PDN gateway P-GW, and an application. The server AS; and the network element in the visited network may include: a mobility management unit MME and a serving gateway S-GW.

The manner in which the network element in the home network involved in the present embodiment receives the call request sent by the user equipment UE by the called number is implemented in the following manner: the P-CSCF receives the UE. The call request sent.

Further, the manner in which the network element in the home network involved in the step S504 in the present embodiment initiates a request for querying the geographic information of the UE according to the call request to the network element in the visited network may be implemented as follows:

Step S504-1: The P-CSCF initiates a request for querying the location information to the PCRF, where the request for querying the location information carries a query indication for querying the geographic information; or the P-CSCF initiates a request for querying the geographic information to the PCRF. ;;

Step S504-2: The PCRF initiates a session modification request carrying the indication of the query geographic information to the P-GW;

It should be noted that the query geographic information indication may be the query indication for querying the geographic information in the foregoing, or may be an indication that the P-CSCF sends the request for querying the geographic information to the PCRF to indicate the query geographic information. .

Step S504-3: The P-GW initiates a bearer update request carrying the indication of the query geographic information to the S-GW.

Step S504-4: The S-GW initiates a bearer update request carrying the query geographic information indication to the MME, where the query geographic information indication is used to instruct the MME to query the geographic information.

For the manner in which the network element in the home network involved in the step S506 receives the response of the network element in the visited network in response to the request, the method may be implemented as follows:

Step S506-1: The S-GW receives the bearer update response that is sent by the MME and carries the geographic information.

Step S506-2: The S-GW sends an update response carrying the geographic information to the P-GW.

Step S506-3: The P-GW sends a session modification response carrying the geographic information to the PCRF.

Step S506-4: The PCRF sends geographic information to the P-CSCF.

The global routable number involved in this embodiment may be obtained by: the P-CSCF generates a geographic identifier according to the geographic information, and forwards the call request carrying the geographic identifier to the AS; the AS receives the call request, and Convert the called number to a global routable number based on the geographic identity.

In another optional implementation manner of this embodiment, the network element in the home network further includes: an application server AS, a home subscription server HSS, and a service call session control function S-CSCF. The network element in the visited network includes: Sex management unit MME. Based on the network element in the home network, the manner in which the network element in the home network involved in the step S502 receives the call request sent by the user equipment UE by visiting the local number to which the network belongs may be implemented in the following manner. The S-CSCF receives the call request sent by the UE, and the S-CSCF forwards the call request to the AS.

After the network element in the home network receives the call request sent by the user equipment UE, the method in this embodiment may further include:

Step S510-1: The AS initiates a query request for geographic information to the HSS, where the query request carries a query indication of the geographic information;

Step S510-2: The HSS sends the locally stored geographic information to the AS;

Step S510-3: The AS converts the called number into a global routable number according to the geographic information, and continues to perform the calling operation according to the global routable number.

It can be seen from the above steps S510-1 to S510-3 that after the HSS sends the query indication to the MME, the MME queries the geographic information according to the query indication, and sends the geographic information to the HSS, and the HSS sends the geographic information to the AS. Further, the local number is converted according to the geographic information, and the call operation is continued according to the converted number.

In another optional implementation manner of this embodiment, before the HSS sends the geographic information to the AS, the method in this embodiment may further include: the HSS sends a query indication to the MME, where the query indication is used to instruct the MME to query the geographic information. The MME sends a query response to the HSS, wherein the response carries geographic information.

In still another optional implementation manner of this embodiment, before the network element in the home network receives the call request sent by the user equipment UE, the method in this embodiment may further include: after the geographical location of the UE changes, the HSS Receiving the updated geographic information of the UE reported by the MME.

In another optional implementation manner of this embodiment, after the network element in the home network receives the call request sent by the user equipment UE, the method in this embodiment further includes:

Step S512-1: The S-CSCF forwards the call request to the AS;

Step S512-2: The AS initiates a query request for querying geographic information to the HSS, where the query request carries a query indication of the geographic information;

Step S512-3: The HSS sends the geographic information corresponding to the query indication to the AS;

Step S512-4: The AS converts the called number into a global routable number according to the geographic information, and continues to perform the calling operation according to the global routable number.

It should be noted that the embodiment is described from the side of the home network, and the side of the visited network corresponds to the present invention, that is, the embodiment of the present invention can also be an IP multimedia sub- The routing processing method of the system IMS local service, the steps of the method include:

Step S11: The network element in the visited network receives a request for querying the geographic information of the UE after the network element in the home network receives the call request of the user equipment UE.

Step S12: The network element in the visited network sends a response to the network element in the home network in response to the request for querying the geographic information, where the response request carries the geographic information of at least one of the following: the country of the country where the UE is located The code, the area code of the area where the UE is located, and the zip code of the area where the UE is located.

That is to say, the above steps S11 and S12 correspond to the above steps S502 to S506 from the side of the visited network.

Embodiment 2

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (eg, ROM/RAM, disk, and optical disk include instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the methods of various embodiments of the present invention.

In this embodiment, a routing processing system for the IMS local service of the IP multimedia subsystem is also provided. The device is used to implement the foregoing embodiments and the preferred embodiments, and details are not described herein. As used below, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.

6 is a structural block diagram of a routing processing system for an IMS local service of an IP multimedia subsystem according to an embodiment of the present invention. As shown in FIG. 6, the routing processing system includes: a network element in the home network 62 and a network element in the visited network 64. The network element in the home network 62 is configured to receive a call request of the user equipment UE, where the called number in the call request is a local number of the visited network; and is initiated according to the call request to the network element in the visited network. a request for querying geographic information of the UE, wherein the geographic information provides a basis for the home network to generate a global routable number; the network element in the visited network 64 is set to respond to the request for querying the geographic information to the home network The network element sends a response, where the response request carries at least one of the following geographic information: a country code of a country in which the UE is located, an area code of a region in which the UE is located, and a zip code of a region in which the UE is located.

FIG. 7 is a block diagram of an optional structure of a routing processing system for an IMS local service according to an embodiment of the present invention. As shown in FIG. 7, the network element in the home network includes: a proxy call session control function P-CSCF, a policy and a meter. The fee rule function PCRF, the PDN gateway P-GW, and the application server AS; the network element in the visited network includes: a mobility management unit MME and a serving gateway S-GW. It should be noted that although the network element in the dotted line frame in FIG. 7 does not appear in this embodiment, the network element in the dotted line frame is added to FIG. 7 for the completeness of the solution.

Based on the network element in the home network and the network element in the visited network, the P-CSCF in this embodiment is configured to receive a call request sent by the local number to which the UE visited the network.

For the manner in which the network element in the home network of FIG. 7 requests the network element in the visited network to query the geographic information of the UE according to the local number, based on the network element in the home network and the visited network in FIG. The network element may be, the P-CSCF, is further configured to initiate a request for querying the location information to the PCRF, where the request for querying the location information carries a query indication of the geographic information; or the P-CSCF initiates the PCRF a request for querying geographic information; the PCRF is configured to initiate a session modification request carrying the indication of the query geographic information to the P-GW; and the P-GW is configured to initiate a bearer update request carrying the indication of the query geographic information to the S-GW; The GW is configured to initiate, to the MME, a bearer update request carrying the indication of the query geographic information, where the query indication is used to instruct the MME to query the geographic information.

For the manner in which the network element in the home network of FIG. 7 sends a response request to the network element in the home network in response to the request for querying the geographic information, the network element in the home network based on FIG. 7 and the network element in the visited network may be used. The S-GW is configured to receive a bearer update response that carries the geographic information sent by the MME, and send a bearer change response carrying the geographic information to the P-GW. The P-GW is configured to send the bearer with the geographic information to the PCRF. Carrying a session modification response; PCRF, set to send geographic information to the P-CSCF.

Optionally, the global routable number is obtained by: the P-CSCF generates a geographic identifier according to the geographic information, and further forwards the call request carrying the geographical indication to the AS; the AS receives the call request, and the called number is determined according to the geographic identifier. Convert to a global routable number.

FIG. 8 is a block diagram of an optional structure of a routing processing system for an IMS local service according to an embodiment of the present invention. As shown in FIG. 8, the network element in the home network may include: The application server AS, the home subscription server HSS, and the service call session control function S-CSCF; the network element in the visited network includes: a mobility management unit MME. It should be noted that although the network element in the dotted line frame in FIG. 8 does not appear in this embodiment, the network element in the dotted line frame is added to FIG. 8 for the completeness of the solution.

Based on the network element in FIG. 8, the S-CSCF in the system may be configured to receive a call request sent by the UE and forward the call request to the AS.

The system may further include: an AS, configured to initiate a query request for the geographic information to the HSS after receiving the call request sent by the user equipment UE by the called number, wherein the query request carries the query indication of the geographic information; the HSS, The method is configured to: after receiving the call request sent by the user equipment UE by the called number, send the geographic information to the AS; AS, and further set to be called according to the geographic information after receiving the call request sent by the user equipment UE by the called number. The number is converted to a global routable number and the call operation continues based on the global routable number.

The system further includes: an HSS, configured to send a query indication to the MME before transmitting the geographic information to the AS, where the query indication is used to instruct the MME to query the geographic information; and the MME is configured to send a query response to the HSS, where the response carries Geographic information.

That is to say, in this mode, the AS directly initiates a query request for geographic information to the HSS, and the HSS sends an inquiry indication to the MME. After the MME queries the geographic information, the geographic information is forwarded to the AS through the HSS, and the AS can further The number is converted.

In another optional implementation manner of this embodiment, before receiving the call request sent by the user equipment UE by the called number, the system in this embodiment may further include: an HSS, after the geographical location of the UE is changed, set to Receiving the updated geographic information of the UE reported by the MME.

After receiving the call request sent by the user equipment UE by the called number, the system further includes: an S-CSCF, configured to forward the call request to the AS; and the AS is set to initiate a query request for the geographic information to the HSS, where the query The request carries the query indication of the geographic information; the HSS is configured to send the geographic information corresponding to the query indication to the AS; the AS is configured to convert the local number according to the geographic information, and continue to perform the call operation according to the converted number. .

That is to say, when the location of the UE changes, the MME is configured to report the updated geographic information of the UE to the HHS, and further, when the call request is generated, the number can be converted according to the updated geographic information.

Based on the foregoing embodiment 1 and the second embodiment, the first embodiment and the second embodiment are described in detail in conjunction with the implementation manners in the specific application scenarios.

Embodiment 1

FIG. 9 is a flowchart 1 of an AS querying an HSS for geographic information according to an embodiment of the present invention. As shown in FIG. 9, the steps of the process include:

Step S901: The UE sends a call request to the IMS network, where the called number is a local number.

Step S902: The S-CSCF forwards the call to the AS;

Step S903: The AS initiates a geographic information query to the HSS.

Step S904: The HSS initiates a geographic information query to the MME.

Step S905: The MME returns a geographic information response to the HSS, and the geographic information may include a country code, an area code, a zip code, and the like;

Step S906: The HSS returns a geographic information response to the AS;

Step S907: The AS performs number conversion;

Step S908: The AS continues the call process, wherein the called number has been replaced with a global routable number;

Embodiment 2

FIG. 10 is a second flowchart of querying geographic information by an AS to an HSS according to an embodiment of the present invention. As shown in FIG. 10, the steps of the process include:

Step S1001: After the MME finds that the geographic information of the UE is changed, the MME reports the updated geographic information to the HSS. If the user is attached for the first time, the MME also reports the geographic information to the HSS. Geographic information may include country code, area code, postal code, etc.

Step S1002: The UE sends a call request to the IMS network, where the called number is a local number;

Step S1003: The S-CSCF forwards the call to the AS;

Step S1004: The AS initiates a geographic information query to the HSS.

Step S1005: The HSS returns a geographic information response to the AS;

Step S1006: The AS performs number conversion;

Step S1007: The AS continues the call process, wherein the called number has been replaced with a global routable number;

Embodiment 3

11 is a flowchart of querying a geographic information by a P-CSCF to a PCRF according to an embodiment of the present invention. As shown in FIG. 11, the steps of the process include:

Step S1101: The UE sends a call request to the P-CSCF, where the called number is a local number;

Step S1102: After receiving the call, the P-CSCF finds that this is a local number, and the P-CSCF queries the PCRF for the geographical location information.

Among them, the P-CSCF can reuse the existing query location information, or add geographic information to the existing location query. Indication of the inquiry;

Step S1103: The PCRF initiates an IP-CAN session modification request to the P-GW.

The PCRF may reuse the existing session modification request, or may add an indication of the geographic information query to the existing request.

Step S1104: The P-GW initiates a bearer modification request to the S-GW.

The P-GW may reuse the existing bearer modification request, or may add an indication of the geographic information query to the existing request.

Step S1105: The S-GW initiates a bearer modification request to the MME.

Wherein, if the request received by the S-GW includes an indication of the geographic information query, it is also sent to the MME in the modification request;

Step S1106: The MME replies to the S-GW with a bearer modification response, which includes geographic information.

Among them, the geographic information may include the country code, area code, postal code, etc.;

Step S1107: The S-GW returns a bearer modification response to the P-GW, where the geographic information is included;

Step S1108: The P-GW replies to the PCRF with a session modification response, which includes geographic information;

Step S1109: The PCRF replies to the P-CSCF with geographic information;

Step S1110: The P-CSCF receives the geographic information and generates the geographic identifier. The subsequent processing procedure after the step is the same as the step after the step S202 in FIG. 2, and details are not described herein again.

The P-CSCF then inserts the GIS into the Invite message and sends it to the user's home IMS network for transmission.

It will be apparent to those skilled in the art that the various modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial applicability

In the embodiment of the present invention, when the UE makes a call request initiated by visiting the local number to which the network belongs, the home network is The network element may initiate a request for querying the geographic information of the UE to the network element in the visited network, and then access the network element in the visited network to query the geographic information, where the geographic information is globally generated for the home network. The routing number provides a basis, that is, even if the P-GW and the S-GW are not in the same network in the related art, the home network can convert the local number by calling the geographical information queried by the visited network, thereby continuing to implement the call, thereby The problem that the P-GW and the S-GW are not in one network and cannot convert the local number when the UE is in the roaming state, which causes the call request to fail, is solved.

Claims

A routing processing method for an IMS local service of an IP multimedia subsystem, comprising:

The network element in the home network receives the call request of the user equipment UE, where the called number in the call request is a local number of the visited network;

The network element in the home network initiates a request for querying the geographic information of the UE to the network element in the visited network according to the call request;

The network element in the home network receives the response of the network element in the visited network to the request, where the response carries geographic information of at least one of the following: a country code of the country where the UE is located. The area code of the area where the UE is located, and the zip code of the area where the UE is located; the geographic information provides a basis for the home network to generate a global routable number.
The method according to claim 1, wherein the network element in the home network comprises: a proxy call session control function P-CSCF, a policy and charging rule function PCRF, a PDN gateway P-GW, and an application server AS; The network element in the visited network includes: a mobility management unit MME and a serving gateway S-GW.
The method of claim 2, wherein the receiving, by the network element in the home network, the call request sent by the user equipment UE by the called number comprises:

The P-CSCF receives the call request sent by the UE.
The method according to claim 2 or 3, wherein the request by the network element in the home network to query the network element in the visited network for querying the geographic information of the UE according to the call request comprises:

The P-CSCF sends a request for querying the location information to the PCRF, where the request for querying the location information carries a query indication for querying the geographic information; or, the P-CSCF reports the The PCRF initiates a request to query geographic information;

The PCRF initiates a session modification request carrying the indication of the query geographic information to the P-GW;

The P-GW initiates a bearer update request carrying the indication of the query geographic information to the S-GW;

The S-GW initiates a bearer update request carrying the query geographic information indication to the MME, where the query geographic information indication is used to instruct the MME to query the geographic information.
The method according to claim 4, wherein the receiving, by the network element in the home network, the response of the network element in the visited network in response to the request comprises:

Receiving, by the S-GW, a bearer update response that is sent by the MME and carrying the geographic information;

Sending, by the S-GW, a bearer update response carrying the geographic information to the P-GW;

Sending, by the P-GW, a session modification response carrying the geographic information to the PCRF;

The PCRF sends the geographic information to the P-CSCF.
The method of claim 4 wherein said globally routable number is obtained by:

The P-CSCF generates a geographic identifier according to the geographic information, and forwards the call request carrying the geographical identifier to the AS;

The AS receives the call request and converts the called number into a global routable number according to the geographic identifier.
The method according to claim 1, wherein the network element in the home network comprises: an application server AS, a home subscription server HSS, a service call session control function S-CSCF, and the network element in the visited network includes: Sex management unit MME.
The method according to claim 7, wherein the network element in the home network receives the call request sent by the user equipment UE by the called number, including:

Receiving, by the S-CSCF, the call request sent by the UE;

The S-CSCF forwards the call request to the AS.
The method according to claim 8, wherein after the network element in the home network receives the call request sent by the user equipment UE, the method further includes:

The AS initiates a query request for geographic information to the HSS, where the query request carries a query indication of the geographic information;

The HSS sends the geographic information to the AS;

The AS converts the called number into a global routable number according to the geographic information, and continues to perform a call operation according to the global routable number.
The method of claim 9 wherein before the HSS transmits the geographic information to the AS, the method further comprises:

Sending, by the HSS, the query indication to the MME, where the query indication is used to instruct the MME to query the geographic information;

The MME sends the query response to the HSS, wherein the response carries the geographic information.
The method according to claim 9, wherein before the network element in the home network receives the call request sent by the user equipment UE, the method further includes:

After the geographic location of the UE is changed, the HSS receives the updated geographic information of the UE reported by the MME.
A routing processing method for an IMS local service of an IP multimedia subsystem, comprising:

The network element in the visited network receives the call request from the network element in the home network after receiving the call request of the user equipment UE. a request for querying geographic information in which the UE is located;

The network element in the visited network sends a response to the network element in the home network in response to the request for querying the geographic information, where the response request carries at least one of the following geographic information: The country code of the country where the UE is located, the area code of the area where the UE is located, and the zip code of the area where the UE is located.
A routing processing system for an IMS local service of an IP multimedia subsystem, the system comprising: a network element in a home network and a network element in a visited network, where

The network element in the home network is configured to receive a call request of the user equipment UE, where the called number in the call request is a local number of the visited network; and the network element in the visited network is requested according to the call request. Initiating a request for querying geographic information in which the UE is located, wherein the geographic information provides a basis for the home network to generate a global routable number;

The network element in the visited network is configured to send a response to the network element in the home network in response to the request for querying the geographic information, where the response request carries the geographic information of at least one of the following The country code of the country where the UE is located, the area code of the area where the UE is located, and the zip code of the area where the UE is located.
The system according to claim 13, wherein the network element in the home network comprises: a proxy call session control function P-CSCF, a policy and charging rule function PCRF, a PDN gateway P-GW, and an application server AS; The network element in the visited network includes: a mobility management unit MME and a serving gateway S-GW.
The system of claim 14 wherein

The P-CSCF is configured to receive the call request sent by the UE.
A system according to claim 14 or 15, wherein

The P-CSCF is further configured to initiate a request for querying location information to the PCRF, where the request for querying location information carries a query indication of the geographic information; or, the P- The CSCF initiates a request for querying geographic information to the PCRF;

The PCRF is configured to initiate, to the P-GW, a session modification request that carries an indication of querying geographic information;

The P-GW is configured to initiate, to the S-GW, a bearer update request that carries an indication of querying geographic information;

The S-GW is configured to initiate, to the MME, a bearer update request that carries an indication of the query geographic information, where the query indication is used to instruct the MME to query the geographic information.
The system of claim 16 wherein

The S-GW is configured to receive a bearer update response that is sent by the MME and that carries the geographic information, and send a bearer change response that carries the geographic information to the P-GW.

The P-GW is configured to send, to the PCRF, a bearer session modification response carrying the geographic information;

The PCRF is configured to send the geographic information to the P-CSCF.
The system of claim 17 wherein said globally routable number is obtained by:

The P-CSCF generates a geographic identifier according to the geographic information, and forwards the call request carrying the geographical identifier to the AS;

The AS receives the call request and converts the called number into a global routable number according to the geographic identifier.
The network according to claim 13, wherein the network element in the home network further comprises: an application server AS, a home subscription server HSS, and a service call session control function S-CSCF, wherein the network element in the visited network comprises: Mobility Management Unit MME.
The system of claim 19, wherein

The S-CSCF is set to the call request sent by the UE, and forwards the call request to the AS.
The system of claim 20 wherein said system further comprises:

The AS is configured to initiate a query request for the geographic information to the HSS after receiving the call request sent by the user equipment UE by using the called number, where the query request carries the query indication of the geographic information;

The HSS is configured to send the geographic information to the AS after receiving a call request sent by the user equipment UE by the called number;

The AS is further configured to: after receiving the call request sent by the user equipment UE by the called number, convert the called number into a global routable number according to the geographic information, and continue to execute according to the global routable number Call operation.
The system of claim 20 wherein said system further comprises:

The HSS is configured to send the query indication to the MME before sending the geographic information to the AS, where the query indication is used to instruct the MME to query the geographic information;

The MME is configured to send the query response to the HSS before transmitting the geographic information to the AS, wherein the response carries the geographic information.
The system of claim 20 wherein said system further comprises:

The HSS is configured to receive the updated geographic information of the UE reported by the MME, before receiving the call request sent by the user equipment UE by the called number, and after the geographical location of the UE is changed.